Note : Les descriptions sont présentées dans la langue officielle dans laquelle elles ont été soumises.
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CA 02559944 1998-10-22
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CONTINUOUSLY VARIABLE TRANSMISSION
Backeround of the Invention
Field of the Invention
The field of the invention relates to transmissions. More particularly the
invention
relates to continuously variable transmissions.
Description of the Related Art
In order to provide an infinitely variable transmission, various traction
roller
transmissions in which power is transmitted through traction rollers supported
in a housing
between torque input and output disks have been developed. In such
transmissions, the
traction rollers are mounted on support structures which, when pivoted, cause
the
engagement of traction rollers with the torque disks in circles of varying
diameters
depending on the desired transmission ratio.
However, the success of these traditional solutions have been limited. For
example, in U.S. Patent No. 5,236,403 to Schievelbusch, a driving hub for a
vehicle with a
variable adjustable transmission ratio is disclosed. Schievelbusch teaches the
use of two
iris plates, one on each side of the traction rollers, to tilt the axis of
rotation of each of the
ZS rollers. However, the use of iris plates can be very complicated due to the
large number of
parts which are required to adjust the iris plates during shifting the
transmission. Another
limitation of this design is that it requires the use of two half axles, one
on each side of the
rollers, to provide a gap in the middle of the two half axles. The gap is
necessary because
the rollers are shifted with rotating motion instead of sliding linear motion.
The use of two
axles is not desirable and requires a complex fastening system to prevent the
axles from
bending when the transmission is accidentally bumped, is as often the case
when a
transmission is employed in a vehicle. Yet another limitation of this design
is that it does
not provide for an automatic transmission.
Therefore, there is a need for a continuously variable transmission having a
simpler
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shifting method and a single axle. Additionally, there is a need for an
automatic traction
roller transmission which is configured to shift automatically. Further, the
practical
commercialization of traction roller transmissions requires improvements in
the reliability,
ease of shifting, function and simplicity of the transmission.
Summary of the Invention
The present invention includes a transmission for use in rotationally or
linearly
powered machines and vehicles. For example the present transmission may be
used in
vehicles such as automobiles, motorcycles, and bicycles. The transmission may,
for
10 example, be driven by a power transfer mechanism such as a sprocket, gear,
pulley or lever,
optionally driving a one way clutch attached at one end of the main shaft.
One version of the invention includes a transmission comprising a shaft, a
rotatable
driving member rotatably mounted on the shaft, a rotatable driven member
rotatably
mounted on the shaft, a plurality of power adjusters frictionally interposed
between the
1 S rotatable driving member and the rotatable driven member and adapted to
transmit power
from the driving member to the driven member, and a rotatable support member
located
concentrically over the shaft and between the shaft and the power adjusters,
and frictionally
engaged to the plurality of power adjusters, so that the power adjusters each
make three
point frictional contact against the driving member, the driven member, and
the support
20 member.
Yet another version of the invention includes a shaft, a rotatable driving
member
rotatably mounted on the shaft, a rotatable driven member rotatably mounted on
the shaft, a
plurality of power adjusters frictionally interposed between the rotatable
driving member
and the rotatable driven member and adapted to transmit power from the driving
member
25 to the driven member, a rotatable support member located concentrically
over the shaft and
between the shaft and the power adjusters, and frictionally engaged to the
plurality of
power adjusters, so that the power adjusters each make three point frictional
contact
against the driving member, the driven member, and the support member, and at
least one
outwardly extendible weight coupled to the plurality of power adjusters and
rotatably
30 axed to the shaft, the at least one weight adapted to actuate a change in
an axis of
rotation of the plurality of power adjusters.
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Various embodiments of this invention provide a transmission comprising: a
driving
member rotatably mounted on a shaft; a driven member rotatably mounted on the
shaft; a
support member rotatably mounted on the shaft between the driving member and
the driven
member; a plurality of power adjusters in frictional contact with each of the
driving
member, the driven member, and the support member; and a plurality of pivot
supports that
receive and support the power adjusters, wherein each pivot support has a
pivot ring
attached to at least one leg.
Other embodiments of this invention provide a transmission comprising: a
driving
member rotatably mounted on a shaft; a driven member rotatably mounted on the
shaft; a
plurality of power adjusters frictionally interposed between the driving
member and the
driven member and adapted to transmit power from the driving member to the
driven
member; a support member fractionally engaged to the plurality of power
adjusters, so that
the power adjusters each make three point frictional contact against the
driving member, the
driven member, and the support member; and at least one stationary support
anchoring the
power adjusters to a non-moving component of the transmission to prevent
orbiting of the
power adjusters about the shaft.
Other embodiments of this invention provide a transmission comprising: a
driving
member; a driven member; a plurality of power adjusters fractionally
interposed between the
driving member and the driven member and adapted to transmit power from the
driving
member to the driven member; a support member fractionally engaged to the
plurality of
power adjusters, so that the power adjusters each make three point frictional
contact against
the driving member, the driven members, and the support member; a first
compression
member adapted to direct the driving member toward the driven member; a second
compression member adapted to direct the driven member toward the driving
member; a
plurality of spindles, one spindle for each of the power adjusters, each
spindle defining an
axis of rotation for each of the power adjusters and adapted to modify an axis
of rotation of
the power adjusters; and at least one stationary support preventing the power
adjusters from
orbiting about a longitudinal axis of the transmission.
Other embodiments of this invention provide a continuously variable
transmission
comprising: a driving member; a driven member; a plurality of power adjusters
fractionally
interposed between the driving member and the driven member; a plurality of
pivot supports
adapted for altering the axes of rotation of the power adjusters; a support
member mounted
so that each power adjuster makes three point contact with the support member,
the driving
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member, and the driven member, and wherein the support member slides axially
in response
to an adjustment of an axis of rotation of the power adjusters; a first
plurality of rollers
positioned adjacent to the driving member, the first plurality of rollers
enabling the force
applied to the power adjusters to be increased via the driving member as
torque is increased;
a second plurality of rollers positioned adjacent to the driven member, the
second plurality
of rollers enabling the force applied to the power adjusters to be increased
via the driven
member as torque is increased; and at least one stationary support attached to
an immovable
surface, the at least one stationary support preventing the orbiting of the
power adjusters
about a longitudinal axis of the transmission.
Other embodiments of this invention provide a shifting apparatus for a
transmission,
the apparatus comprising: a spindle; a pivot ring having two positioners for
receiving the
spindle; a pivot leg that attaches to the pivot ring; and a ratio changer
adapted to engage the
pivot leg.
Brief Description of the Drawings
Figure 1 is a partial perspective view of the transmission of the present
invention.
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Figure 2 is a partial exploded view of the transmission of Figure 1.
Figure 3 is an end cutaway elevational view of the transmission of Figure 1.
Figure 4 is a cutaway side elevational view of the transmission of Figure 1.
Figures S and 6 are cutaway side elevational views of the transmission of
Figure 1
illustrating the transmission of Figure 1 shifted into different positions.
Figure 7 is an end cutaway view of an alternative embodiment of the
transmission
of the invention wherein the transmission shifts automatically.
Figure 8 is a side elevational view of the transmission of Figure 7.
Figure 9 is an end cutaway view of an alternative embodiment of the
transmission
of the invention wherein the transmission includes a stationary hub shell.
Figure 10 is a cutaway side elevational view of the transmission of Figure 9.
Figure 11 is a cutaway side elevational view of an alternative embodiment of
the
transmission of Figure 1 wherein the transmission has two thrust bearings.
Figure 12 is a cutaway side elevational view of an alternative embodiment of
the
1 S invention wherein a first and second one way rotatable driver provides an
input torque to
the transmission.
Figure 13 is a schematic cutaway end elevational view of another alternative
embodiment of the transmission of the invention.
Figure 14 is a schematic cutaway front elevational view of the transmission of
Figure 13.
Figure 15 is a schematic end view of a housing for the transmission of Figures
13
and 14.
Figure 16 is a schematic cutaway front elevational view of another alternative
embodiment of the transmission of the invention.
Figure 17 is a side elevational view of an alternative embodiment of a support
member.
Figure 18 is a side elevational view of an alternative embodiment of a support
member.
Figure 19 is a side eIevational view of an alternative embodiment of a support
member.
Figure 20 is a schematic cutaway side elevational view of an alternative
embodiment of the invention including: a thrust bearing, a washer, and a
tension member.
Figure 21 is a schematic cutaway side elevational view of an alternative
embodiment of the invention wherein the support member has at each end a
thrust bearing,
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washer, and the pivot supports have legs.
Figure 22 is a front elevational view of a washer of the transmission of
Figure 21.
Figure 23 is a side elevational view of a pivot support of the transmission of
Figure
21.
5 Figure 24 is a bottom plan view of a pivot support of the transmission of
Figure 21.
Figure 25 is a front elevational view of an alternative embodiment of a
stationary
support.
Figure 26 is a cutaway side elevational view of the stationary support of
Figure 25.
Figure 27 is a front elevational view of an alternative embodiment of a
stationary
support.
Figure 28 is a cutaway side elevational view of the stationary support of
Figure 27.
Figure 29 is a partial top plan view of the stationary support of Figure 27.
Figure 30 is a front elevational view of an alternative embodiment of a
stationary
support.
Figure 31 is a cutaway side elevational view of the stationary support of
Figure 30.
Figure 32 is a cutaway side elevational view of an alternative embodiment of
the
main shaft of Figure 2.
Figure 33 is a cutaway end elevational view of the shaft of Figure 32.
Figure 34 is a schematic cutaway front elevational view of an alternative
embodiment of the transmission of the invention.
Figure 35 is a schematic cutaway side elevational view of an alternative
embodiment of the transmission that shifts automatically.
Figure 36 is a schematic cutaway end elevational view of the annular beating
depicted in Figure 35.
Figure 37 is a schematic cutaway side elevational view of an alternative
embodiment of the invention having a coasting mechanism.
Figure 3 8 is a front elevational view of the alternative coasting mechanism
of Figure
37.
Detailed Description of the Invention
The following detailed description is directed to certain specific embodiments
of the
invention. However, the invention can be embodied in a multitude of different
ways as
de&ned and covered by the claims. In this description, reference is made to
the drawings
wherein like parts are designated with like numerals throughout.
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The present invention includes a continuously variable transmission that may
be
employed in connection with any type of machine that is in need of a
transmission. For
example, the transmission may be used in (l) a motorized vehicle such as an
automobile,
motorcycle, or watercraft, (ii) a non-motorized vehicle such as a bicycle,
tricycle, scooter,
exercise equipment or (iii) industrial power equipment, such as a drill press
or power
generating equipment, such as a windmill.
Figures 1 through 4 disclose one embodiment of the present invention. Figure 1
is
a partial perspective view of a transmission 100. Figure 2 is an exploded view
of the
transmission 100 of Figure 1. Figure 3 shows a partial cross sectional end
view of the
transmission 100. Figure 4 shows a cutaway side elevational view of the
transmission 100.
Referring generally to Figures 1 through 4, a hollow main shaft 102 is affrxed
to a
frame of a machine (not shown). The shaft 102 may be threaded at each end to
allow a
fastener (not shown) to be used to secure the transmission 100 on the main
shaft' 102
I S and/or to attach the main shaft 102 to a machine. A rotatable driver 401
(Figure 4)
comprising a sprocket or a pulley is rotatably axed to the main shaft 102, so
as to provide
an input torque to the transmission 100. A drive sleeve 104 is coaxially
coupled to the
rotatable driver 401 (Figure 4) and rotatably disposed over the main shaft
102. A surface
106 (Figure 2) of the drive sleeve 104 opposite the rotatable driver 401
(Figure 4), can
include a plurality of shallow grooves 108.
A first roller cage assembly 110 is coaxially coupled to the drive sleeve 106
opposite the rotatable driver 401 and also rotatably disposed over the main
shaft 102. The
first roller cage assembly 110 has a plurality of cylindrical rollers 112
radially arranged
about a midpoint of the roller cage assembly 110. Each of the cylindrical
rollers 112 are
rotatably mounted on the first roller cage assembly 110 such that each of the
rollers may
rotate about its lengthwise axis. Preferably, a one-to-one correlation exists
between each of
the shallow grooves 108 and each of the cylindrical rollers I 12. Optionally,
the cylindrical
rollers 112 may be replaced with rollers of an alternative geometric shape,
such as with
spherical rollers.
A tension inducer 118 (Figure 2), such as a spring, is rotatably disposed over
the
main shaft 102 and fiictionally coaxially coupled to the first roller cage
assembly 110
opposite to the drive sleeve 104: Further, a rotatable driving member 120 is
rotatably
axed to the main shaft 102 and coaxially coupled to a side of the first roller
cage assembly
110 opposite the drive sleeve 104. A surface 107 (Figure 4) of the rotatable
driving
CA 02559944 1998-10-22
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member 120 opposed to the drive sleeve 104 includes a plurality of shallow
grooves 109
(Figure 4). Relative rotation of the roller cage 110 with respect to the drive
sleeve 104
causes the cylindrical rollers 112 to roll on the shallow grooves 108, 109 and
move the
shallow grooves I08, 109 toward or away from each other along the axis of the
main shaft
102.
A plurality of spherical power adjusters 122A, 1228, 122C are in frictional
contact
with a side of the rotatable driving member 120 opposite the roller cage
assembly 1 I0. In
one embodiment of the invention, the power adjusters 122A, 1228, 122C are
spheres made
of hardened steel; however, the power adjusters 122A, 1228, 122C may
alternatively
Z O include other shapes and be manufactured from other materials. A plurality
of spindles
130A, 1308, 130C (Figure 2) respectively extend through multiple passages
128A, 1288,
128C (Figure 2) in the power adjusters 122A, 1228, 122C. Radial bearings (not
shown)
may be disposed over each of the spindles 130A, 1308, 130C (Figure 2) to
facilitate the
rotation of the power adjusters 122A, I22B, 122C.
15 A plurality of pivot supports 134A, 1348, I34C respectively hold the
spindles
130A, 1308, 130C Figure 2). The support 134A includes two legs 135A and 137A
for
connection to a ratio changer 166 which is discussed in further detail below.
Similarly, the
support 1348 includes two legs 1358 and 1378, and the pivot support 134C
includes two
legs 135C and 137C.
20 The pivot supports 134A, 1348, 134C respectively include pivot rings 136A,
1368, 136C. The pivot ring 136A has four apertures 138A, 140A, 142A, 144A
(Figure 2).
Similarly, the pivot support 1348 has four apertures 1388, 1408, 1428, and
I44B, and
the pivot support 134C has four apertures 138C, 140C, 142C, and 144C (Figure
2). The
aperrtures 138A, 1388, 138C are respectively located opposite to the apertures
140A,
25 I40B, 140C on the pivot rings 136A, I36B, and 136C. Together, the apertures
138A,
1388, 138C, and the apertures 140A, 1408, 140C are respectively configured to
receive
the spindles 130A, 1308, 130C (Figure 2).
The aperrtures 142A, 1428, 142C (Figure 2) are respectively located opposite
to
the apertures 144A, 1448, 144C (Figure 2) on the pivot rings 136A, 1368, 136C.
30 Together, the apertures 142A, 1428, 142C and the apertures 144A, I44B, 144C
are
configured to receive multiple immobilizers 150A, 1508, I SOC (Figure 2). In
one
embodiment of the invention, the immobilizers I SOA, I SOB, I SOC are each
cylindrical rigid
rods, slightly angled at each end. A central portion of each of the
immobilizers 150A,
I SOB, 1 SOC are affixed to one of multiple legs I 53 (Figure 2) of a
stationary support 152
CA 02559944 1998-10-22
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(Figure 2). The stationary support 152 is fixedly attached to the main shaft
102.
A support member 154 is slidingly and rotatabiy disposed over the main shaft
102
proximate to a side of the stationary support 152 (Figure 2) which is opposite
to the
rotatable driving member 120. The support member 154 is in frictional contact
with each
of the power adjusters 122A, 122B, 122C. In one embodiment of the invention,
the
support member 154 is a cylindrical ring having a substantially uniform outer
circumference
from an end cross-sectional view. In another embodiment of the invention, the
support
member 154 is a cylindrical ring having a first and second flange (not shown)
which
respectively extend radially outwardly from a first and second end of the
support member
154 so as to prevent the power adjusters 122A, 122B, 122C from disengaging
from the
support member 154. In yet another embodiment of the invention, the support
member
154 is a cylindrical ring having a nominally concave outer surface (Figure
17).
The support member 154 may contact and rotate upon the main shaft 102, or may
be suspended over the main shaft 102 without substantially contacting it due
to the
centering pressures applied by the power adjusters 122A, 122B, 122C.
Referring in particular to Figure 2, a shifting member 160, such as an
inflexible rod,
is slidingly engaged to an inner passage of the main shaft 102. Two extensions
162, 164
perpendicularly extend from the shifting member 160 through an opening 165 in
the main
shaft 102. A first end 161 of the shifting member 160 proximate to the drive
side of the
transmission 100 is connected to a linkage 163, such as a cable. The linkage
163 is
connected at an end opposite to the main shaft 102 to a shifting actuator (not
shown). A
tension member 202, such as a spring, is connected to a second end of the
shifting member
I 60 by a fastener 204.
Still referring in particular to Figure 2, the extensions 162, 164 connect to
the ratio
changer 166. The ratio changer 166 includes a planar platform 168 and a
plurality of legs
I 71 A, 171 B, 171 C which perpendicularly extend from a surface of the
platform 168
proximate to the support member 154. The leg 171 A includes two linkage pins
172A,
173A Similarly, the leg 171B includes two linkage pins 172B and 173B, and the
leg 171C
includes two linkage pins 172C and 173C. The linkage pins 172A, 172B, 172C,
and the
linkage pins 173A, 173B, 173C are used to couple the ratio changer 166 to each
of the
pivot supports 134A, 134B, and 134C.
In regard to the coupling of the support 134A and the ratio changer 166, the
linkage pin 172A engages an end of the leg 137A of the support 134A opposite
the pivot
ring 136A, and the linkage pin 172B engages an end of the leg 135A opposite
the pivot
CA 02559944 1998-10-22
.8.
ring 136A. Further, in regard to the coupling between the pivot support 134B
and the ratio
changer 166, the linkage pin 1738 engages an end of the leg 1378 opposite the
pivot ring
1368, and the linkage pin 172C engages an end of the leg 1358 opposite the
pivot sing
1368. Finally, in regard to the coupling between the pivot support 134C and
the ratio
5 changer 166, the linkage pin 173C engages an end of the leg 137C opposite
the pivot ring
136C, and the linkage pin 173A engages an end of the leg 1378 opposite the
pivot ring
136C.
Although only three power adjusters 122A, 1228, 122C are disclosed, the
transmission 100 of the invention may be configured with fewer (e.g., 2) or
more (e.g., 4, 5,
6 or more) power adjusters. Further, the number of legs on the ratio changer
166, the
number of legs on the stationary support 152, the number of immobilizers, the
number of
pivot supports in the transmission may aII be correspondingly adjusted
according to the
number of power adjusters that are employed.
Referring again in general to Figures 1-4, a rotatable driven member 170 is
rotatably engaged to the main shaft 102 proximate to the ratio changer 166
(Figure 2). The
rotatable driven member 170 is in frictional contact with each of the power
adjusters 122A,
1228, 122C. A surface 174 of the rotatable driven member 170 opposite the
power
adjusters 122A, 1228, 122C, includes a plurality of shallow grooves 176. The
rotatable
driven member 170 is in frictional coaxial contact with a second tension
inducer 178
(Figure 2), such as a spring, and a second roller cage assembly 180 that is
similar in design
to the roller cage assembly 110. The second tension inducer 178 (Figure 2) and
the second
roller cage assembly 180 are rotatably disposed over the main shaft 102. A hub
driver 18b
(Figure 4) is rotatably disposed over the main shaft 102 and coaxially engaged
to a side of
the second roller cage assembly 180 opposite the rotatable driven member 170.
The hub
driver 186 (Figure 4) may be axed to a hub shell 302 (Figures 3 and 4) using
any
traditional gearing mechanism. In one embodiment of the invention, the hub
driver 186
extends proximate to the hub shell 302 and is connected to a one way rotatable
driver 300,
such as a one way roller clutch. The one way rotatable driver 300 (Figures 3
and 4) is
rotatably coupled to the hub shell 302 (Figures 3 and 4).
Note that the power adjusters I22A, 1228, 122C are suspended in tight three-
point
frictional contact with the drive member 120, the support member 154, and the
driven
member 170.
The hub shell 302 (Figures 3 and 4) has a plurality of holes 304 (Figure 3)
which
provide a means for attaching the hub shell 302 to a wheel, propeller or other
propulsion
CA 02559944 1998-10-22
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means. The hub shell 302 is supported and is free to rotate on the main shaft
102 by means
of hub bearings 410 (Figure 4) which fit into slots in the hub driver 186. A
washer 412
(Figure 4) is affixed to the main shaft 102 proximate to a side of the hub
driver 186
opposite the second roller cage assembly I 80 to facilitate the rotation of
the hub beatings
5 410 (Figure 4).
Figures 5 and 6 are a cutaway side elevational views of the transmission of
Figure 1
illustrating the transmission of Figure 1 in two difi'erent shifted positions.
With reference to
Figures S and 6, a method of shifting the transmission 100 is disclosed below.
Upon an input force, the drive sleeve 104 begins to rotate in a clockwise
direction.
(It should be noted that the transmission 100 is also designed to be driven in
a counter-
clockwise direction.) At the beginning ofthe rotation of the drive sleeve 104,
nominal axial
pressure is supplied by the tension inducers 118, 178 (Figure 2) to ensure
that the rotatable
driving member 120, the rotatable driven member 170, and the support member I
54 are in
tractive contact with the power adjusters 122A, 122B, 122C.
The rotation of the drive sleeve 104 in a clockwise direction engages the
first roller
cage assembly 110 to rotate in a similar direction. At a low torque, the
rollers 112 remain
centered between the shallow grooves 108, 109 of the rotatable driving member
120 and
the drive sleeve 104. As additional torque is applied, the rollers 112 ride up
the sloping
sides of the grooves 108 and force the drive sleeve 104 and the rotatable
driving member
120 farther apart. The same action occurs on the opposite end of the
transmission 100
wherein the rotatable driven member 170 engages the hub driver 186 thoueh the
second
roller cage assembly 180. Thus, the first roller cage assembly 110 and second
roller cage
assembly 180 compress the rotatable driving member 120 and the rotatable
driven member
170 together against the power adjusters 122A, 122B, 122C, which increases the
fiictional
25 contact of the power adjusters 122A, 122B, 122C against the support member
I 54, the
drive member 120, and the driven member 170.
As the first rotatable driving member 120 is rotated in a clockwise direction
by the
roller cage assembly 110, the first rotatable driving member 120 fiictionally
rotates the
power adjusters 122A, 122B, 122C. The clockwise rotation of the power
adjusters 122A,
30 122B, 122C causes a clockwise rotation of the rotatable driven member 170.
The
clockwise rotation of the rotatable driven member 170 engages the second
roller cage
assembly 180 to rotate in a clockwise direction. In turn, the clockwise
rotation of the
second roller cage assembly 180 engages the hub driver 186 (Figure 4) to drive
in a
clockwise direction. The clockwise rotation of the hub driver 186 causes the
one way
CA 02559944 1998-10-22
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rotatable driver 300 to rotate clockwise. The one way rotatable driver 300
then drives the
hub shell 302 (Figures 3 and 4) to rotate in a clockwise direction.
The shifting member 160 is used to modify the axis of a rotation for the power
adjusters 122A, 1228, 122C. To shift the transmission 100, the shifting
actuator (not
5 shown) slides the shifting member 160 in a first direction 500 (Figure 5). A
release in
tension of the linkage 163 by the shifting actuator (not shown) causes the
shifting member
160 to slide in a second and opposite direction 600 (Figure 6) by the tension
member 202.
The particular constn,~ction of the present transmission 100 provides for much
easier
shifting than prior art traction roller designs.
10 When the shifting member 160 is moved in either direction by a user, the
extensions
162, 164 engage the ratio changer 166 to axially move across the main shaft
102.
Referring to Figure 5, when the shifting member 160 is moved, the ratio
changer 166 pivots
the supports 134A, 1348, 134C. The pivoting of the supports 134A, 1348, 134C
tilts the
ball spindles 130A; 1308, 130C and changes the axis of rotation of each of the
power
I 5 adjusters 122A5 1228, and 122C. When the shifting member 160 is moved in
the direction
500, the axis of rotation of each of the power adjusters 122A, 1228, 122C is
modified such
that the rotatable driving member 120 contacts a surface of power adjuster,
120A, I20B,
120C closer to the axis of rotation of the power adjusters 120A, 1208, 120C.
Further, the
rotatable driven member 170 contacts the power adjuster at a point on a
surface of the each
20 of the power adjusters 120A, 1208, 120C further away from the axis of
rotation of the
power adjusters I20A, 1208, 120C. The adjustment of the axis of rotation for
the power
adjusters 122A, 1228, 122C increases an output angular velocity for the
transmission 100
because for every revolution of the rotatable driving member 120, the
rotatable driven
member 170 rotates more than once.
25 Referring to Figure 6, the transmission 100 of the invention is shown in a
position
which causes a decrease in the output angular velocity for the transmission
100. As the
shifting member 160 is directed in the direction 600, opposite the first
direction 500, the
axis of rotation of each of the power adjusters 122A, 1228, 122C is modified
such that the
rotatable driven member 170 contacts a surface of each of the power adjusters
122A,
30 1228, 122C closer to the axis of rotation of each of the power adjusters
122A, 1228,
122C. Further, the rotatable driving member 120 contacts each of the power
adjusters
122A, 1228, 122C at a point on a surface of each of the power adjusters 122A,
1228,
122C further away from the axis of rotation of each of the power adjusters
122A, 1228,
122C. The adjustment of the axis of rotation for the power adjusters 122A,
1228, 122C
r
CA 02559944 1998-10-22
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decreases an output angular velociiy for the transmission 100 because for
every revolution
of the rotatable driving member 120, the rotatable driven member 170 rotates
less than
once.
Figures 7 and 8 illustrate an automatic transmission 700 of the present
invention.
For purposes of simpfiaty of description, only the differences between the
transmission 100
of Figures 1-6 and the automatic transmission 700 are described. Figure 7 is a
partial end
elevational view of the transmission 700, and Figure 8 is partial side
elevational view of the
transmission 700.
A plurality of tension members 702A, 7028, 702C, which may each be a spring,
interconnect each of the pivot rings 136A, 1368, 136C. The tension member 702A
is
connected at a first end to the pivot ring 136A and at a second end opposite
the first end to
the pivot ring 1368. Further, the tension member 7028 is connected at a first
end to the
pivot ring 1368 proximate to the aperture 1388 and at a second end opposite
the first end
to the pivot ring 136C proximate to the aperture 138C. Further, the tension
member 702C
is connected at a first end to the pivot ring 136C proximate to the aperture
138C and at a
second end opposite the first end to the pivot ring 136A proximate to the
aperture 138A.
The transmission 700 also includes flexible extension members 708A, 7088, 708C
respectively connected at a first end to the pivot rings 136A, 1368, 136C. The
transmission 700 also includes a first annular bearing 806 and a second
annular bearing 816
to assist in the shifting of the transmission 700. The first annular bearing
806 is slidingly
attached to the hub shell 302 such that first the annular bearing 806 can
further be directed
toward the rotatable driving member 120 or the rotatable driven member 170.
The second
annular bearing 816 also is configured to be slid toward either the rotatable
driving member
120 or the rotatable driven member 170; however, the second annular bearing
816 is not
rotatable about the main shaft 102, unlike the first annular bearing 806. The
first annular
bearing 806 and the second annular bearing 816 supports multiple bearing balls
808. A
second end of each of the extension members 708A, 7088, 708C connects to the
second
annular bearing 816 (Figure 8).
Multiple extension members 7I8A, 7188, 718C respectively connect the first
annular bearing 806 to multiple weights 720A, 7208, 720C. Optionally, a
plurality of
pulleys 822 may be used to route the extension members 718A, 7188, 718C from
the first
annular bearing 806 to the weights 720A, 7208, 720C, and route the extension
members
708A, 7088, ?08C to the second annular bearing 816.
Still referring to Figures 7 and 8, a method of operation for the transmission
700 is
CA 02559944 1998-10-22
-12-
disclosed. Similar to the embodiment of the invention disclosed in Figure 1, a
clockwise
input torque causes clockwise rotation of the drive sleeve 104, the first
roller cage assembly
110, and the rotatable driving member I20: The rotatable driving member I20
engages the
power adjusters I22A, I22B, 122C to rotate, and thereby drives the rotatable
driven
5 member 170. The rotation of the rotatable driven member 170 drives the
second roller
cage assembly 180 and produces an output torque.
However, to be distinguished from the transmission 100 illustrated in Figure
l, the
ratio of rotation between the rotatable driving member 120 and the rotatable
driven
member 170 is adjusted automatically by a centrifugal outward movement of the
weights
720A, 720B, 720C. As the weights 720A, 720B, 720C extend outwardly, the
extensions
7I8A, 718B, 718C pull the first annular bearing 806 toward the rotatable
driving member
120. The movement of the first annular bearing 806 toward the rotatable
driving member
120 similarly causes the movement of the bearings 808 and the second annular
bearing 816
toward the rotatable driving member 120.
The movement of the first annular bearing 806 toward the rotatable driving
member
120 causes the extension members 708A, 708B, 708C to respectively pivot the
pivot rings
306A, 306B, 306C and adjust the axis of rotation of each of the power
adjusters 122A,
122B, 122C. After the adjustment, the rotatable driven member 170 contacts a
surface of
power adjusters 120A, 120B, 120C closer to the axis of rotation of each of the
power
20 adjuster 122A, 122B, 122C. Conversely, the rotatable driving member 120
contacts the
power adjusters 122A, 122B, 122C at a point on a surface of the each of the
power
adjusters 122A, 122B, 122C further away from the axis of rotation of the power
adjusters
122A, 122B, 122C. The adjustment of the axis of rotation for the power
adjusters 122A,
122B, 122C decreases an output angular velocity for the transmission 100
because for
25 every revolution of the rotatable driving member 120, the rotatable driven
member 170
rotates less than once. When the hub shell 302 rotates more slowly, the
compression
members 702A, 702B, 702C adjust the axis of rotation of the power adjusters
122A, 122B,
122C to provide to a lower output angular velocity in comparison to the input
angular
velocity.
30 Figures 9 and 10 illustrate an alten~rative embodiment of the invention.
For
purposes of simplicity of description, only the differences between the
transmission 100 of
Figures l and a transmission 900 of Figures 9 and 10 are described. Figure 9
is a partial
end elevational view of the transmission 900, and Figure 10 is partial side
elevational view
of the transmission 900.
CA 02559944 1998-10-22
-13-
The transmission 900 includes flexible extension members 908A, 9088, 908C
respectively connected at a first end to the pivot rings 136A, 1368, 136C. A
second end of
the extension members 908A, 9088, 9080 connects to a synchronization member
912.
Further each of the extension members 908A, 9088, 908C are slidingly engaged
to a
plurality of pulleys 916 (Figure 9) which are affiaced to the hub shell 302.
It is noted that
the number and location of the each of the pulleys 916 (Figure 9) may be
varied. For
example, a different pulley configuration may be used to route the extension
members
908A, 9088, 908C depending on the selected frame of the machine or vehicle
that employs
the transmission 900. Additionally, the pulleys 916 and extension members
908A, 9088,
908C may be located inside the hub shell 302.
The hub shell 302 of the transmission 900 is non-rotational. Further, the hub
shell
302 includes a plurality of apertures (not shown) which are used to guide the
extension
members 908A, 9088, 908C to the synchronization member 912.
To be noted, according to the embodiment of the invention illustrated in
Figures 9
and 10, the shifting assembly of the transmission 100 of Figure 2 may be
eliminated,
including the main shaft 102 (Figure 2), the tension member 202 (Figure 2),
the extensions
162, 164 (Figure 2) and the shifting actuator (not shown).
Still referring to Figures 9 and 10, a method of operation for the
transmission 900 is
disclosed. Similar to the embodiment of the invention disclosed in Figure 1,
an input torque
causes a clockwise rotation of the drive sleeve 104, the first roller cage
assembly 110, and
the rotatable driving member 120. The rotatable driving member 120 engages the
power
adjusters 122A, 1228, 122 to rotate, and thereby drive the rotatable driven
member 170.
The rotation of the rotatable driven member 170 drives the second roller cage
assembly 180
and produces an output torque.
In the transmission 900, the ratio of rotation between the rotatable driving
member
120 and the rotatable driven member 170 is adjusted by the manipulation of the
synchronization member 912. As the synchronization member 912 is outwardly
directed
from the hub shell 302, the extension members 908A, 9088, 908C respectively
pivot the
pivot rings 136A, 1368, 136C such that the axis of rotation of each of the
power adjusters
122A, 1228, and 122C is similarly pivoted. The axis of rotation of each of the
power
adjusters 122A, 1228, 122C is modified such that the rotatable driving member
120
contacts a surface of power adjusters 122A, 1228, 122C fiirther away from the
axis of
rotation of each of the power adjusters 122A, 1228, 122C. Conversely, the
rotatable
driven member 170 contacts the power adjusters 122A, 1228, 122C at a point on
a
CA 02559944 1998-10-22
-14-
surface of the each of the power adjusters 122A, 122B, 122C closer to the axis
of rotation
of each of the power adjusters 122A, 122B, 122C. The adjustment of the axis of
rotation
for the power adjusters 122A, 122B, 122 decreases an output angular velocity
for the
transmission 100 because for every revolution of the rotatable driving member
120, the
5 rotatable driven member 170 rotates less than once.
When the synchronization member 912 is directed toward the hub shell 302, the
tension members 702A, 702B, 702C compress. This compression causes an end of
the
pivot rings I36A, I36B, 136C proximate to the rotatable driven member I70 to
pivot
toward the main shaft 102. The pivoting of the pivot rings 136A, 136B, 136C
causes the
I 0 ass of rotation of each of the power adjusters 122A, 122B, 122C to be
modified such that
the rotatable driven member 170 rotates slower than the rotatable driving
member 120.
Figure 11 illustrates another alternative embodiment of the invention
including a
transmission 1100 having a first thrust bearing I 106 and a second thrust
bearing 1108. The
first thrust beating l I06 is rotatably disposed over the main shaft 102 and
is positioned
15 between the support member 154 and the extensions 162, 164. The second
thrust bearing
I I08 is disposed over the main shaft 102 on a side of the support member 154
opposite the
first thrust bearing 1106. The transmission I 100 may optionally also include
a second ratio
changer, such as ratio changer 1110, which is disposed over the main shaft 102
and is
axially slidable.
20 When the ratio changers 166, 1110 slide axially to cause a shift in the
transmission
1100, the ratio changers 166, 1110 also slide the thrust bearings 1106, 1108.
The sliding of
the thrust bearings 1106, 1108 forces the support member 154 to slide in
unison with the
ratio changers I 66, 1 I 10. A small amount of play is provided between the
support member
154 and the thrust bearings 1106, 1008 so that the thrust bearings 1106, 1108
do not
25 contact the support member 154 except when the transmission I 100 is in the
process of
shifting.
Figure 12 illustrates an alternative embodiment of the invention. Figure 12
illustrates a transmission 1200 that operates similarly to the embodiment of
the invention
disclosed in Figure 10; however, the transmission 1200 of Figure 12 includes
two rotatable
30 drivers 1204, 1206 and a rotatable driving shaft 1212. The rotatable
driving shaft 1212 is
fixedly attached to the drive sleeve 104.
Still referring to Figure 12; the first rotatable driver 1204 includes a one
way clutch
1208 that is configured to rotate the rotatable driving shaft 1212 upon the
rotation of the
rotatable driver in a first direction. The second rotatable driver 1206
includes a one way
CA 02559944 1998-10-22
-1S-
clutch 1210. The second rotatable driver 1206 is configured to engage the
drive sleeve 104
upon the rotation of the second rotatable driver 1206 in a second direction,
which is
opposite to the activation direction of the first rotatable driver 1204. The
second rotatable
driver 1206 is fixedly attached to the drive sleeve 104.
S Figure 13 schematically illustrates another alternative embodiment of the
invention
having a transmission 1300 that is configured to shift automatically. Three
pulleys 1306,
1308, 1310 are respectively connected to the pivot rings 136A, 136B, and 136C.
A cable
1312 is guided around the pulley 1306 and connects at a first end to the main
shaft 102 and
. connects at a second end to an annular ring (not shown), similar to the
annular ring 816 of
10 Figure 8. Similarly, a cable 1314 is guided around the pulley 1308 and
connects to the
main shaft 102 at a first end and connects at a second end to the annular ring
(not shown).
Lastly, a cable 1316 is guided around the pulley 1310 and connects at a first
end to the
main shaft 102 and connects at a second end to the annular ring (not shown).
Figure 14 schematically illustrates the transmission 1300 of Figure 13 from a
front
1 S end. A plurality of tension members 1404, 1406, 1408 interconnect each of
the pivot rings
136A, 136B, and 136C. The tension member 1404 connects at a first end to the
pivot ring
136A and connects at a second end opposite the first end to the pivot ring
136B. The
tension member 1406 connects at a first end to the pivot ping 136B and
connects at a
second end opposite the first end at the pivot ring 136C. The tension member
1408
20 connects at a first end to the pivot ring 136A and connects at a second end
opposite the
first end at the pivot ring 136C.
Figure I S schematically illustrates a housing 1500 for the transmission 1300
of
Figures 13 and 14. The housing 1500 includes three hollow guide tubes 1504,
1506, and
1508. Each of the hollow guide tubes 1504, 1506, 1508 connect at a first end
to a hub
2S shell 1 S 12 that holds the transmission 1300 and at a second end opposite
the first end to a
transmission wheel 1 S 14. Three tension members 1 S 16, 1 S 18, I 520 are
respectively
disposed within the guide tubes 1504, 1506, 1508 and are connected at a first
end to the
transmission wheel 1 S 14. A second end of the tension members 1 S 16, 1 S 18,
1520
opposite the transmission wheel 1 S 14 are respectively connected with
spherical weights
30 1526, 1528, 1530. In alternative embodiments of the invention, the weights
1526, 1528,
1530 may be adapted to other geometric shapes.
Multiple linkage members 1532, 1534, 1536, respectively extend from the
weights
1526, 1528, 1530 to an annular member (not shown), such as the annular member
806 of
Figure 8.
CA 02559944 1998-10-22
-16-
Tuning to the method of operation of the housing 1500 of Figure 15, the
rotation
of the hub shell 1512 causes the rotation of the hollow guide tubes 1504,
1506, 1508. As
the guide tubes 1504, 1506, 1058 rotate, the weights 1526, 1528, 1530 extend
outwardly
toward the transmission wheel 1514. The outward movement of the weights 1526,
1528,
5 1530 causes a shifting of the axis of rotation of the power adjusters 122A,
122B, 122C of
Figures 13 and 14.
Figure 16 is another alternative embodiment of the invention. Figure 16 is a
schematic illustration of a manual version of the transmission 1300 shown in
Figures 13 and
14. For purposes of simplicity of description, only the differences between
the transmission
1600 of Figure 16 and the transmission 1300 of Figures 13 and 14 are
described. The
transmission 1600 includes a flexible cable 1602 that connects at a first end
to a shifting
actuator (not shown). The cable 1602 extends from the shifting actuator (not
shown),
through the central passageway of the main shaft 102 and then extends through
an aperture
(no't shown) on the main shaft 102. From the aperture (not shown) the cable
1602 extends
around the pulley 1308. From the pulley 1308, the cable is guided around the
pulley 1306.
From the pulley I306, the cable extends to the pulley 1308. Finally, from the
pulley 1308,
the cable 1602 connects to the main shaft 102.
Still referring to Figure 16, as the cable 1602 is directed toward the
shifting actuator (not
shown), the cable 1602 pulls on the pulleys 1304, 1306, 1308 thereby causing a
shift in the
20 axis of rotation of each of the power adjusters 122A, 122B, 122C.
Conversely, when the
shifting actuator (not shown) releases the cable 1602, the tension members
1404, 1406,
1408 cause each of the axis of rotation of the power adjusters 122A, 122B,
122C to shift in
a second and opposite direction. Referring to Figures 17-19, three alternative
embodiments of the support member I 54 are disclosed. In Figure 17, the
support member
25 154 is a cylindrical ring having a nominally concave outer surface.
In Figure 18, the circumference of the support member I 800 is the narrowest
near
a mid-point 1802 of the support member. From the midpoint, the outer
circumference of
the support member 154 increases up to each of the ends of the support member
154. It is
noted that the slope created by the outer surface of the support member 154
gradually
30 increases from being horizontal, relative to its longitudinal axis, at the
midpoint 1802 to
about a 30 degrees angle at each of the ends of the support member 154. The
shape of the
support member 1800 allows for axial movement of the support member 1800,
thereby
aiding in the ease of shifting of the transmission and also preventing the
support member
154 from becoming dislocated at either of its ends during shifting.
CA 02559944 1998-10-22
-17-
Figure 19 depicts a support member 1900 having a concave outer surface. The
shape of the support member 1900 prevents the support member 1900 from
wandering
across the main shaft 102 while the transmission 100 is in use.
Figure 20 illustrates an alternative embodiment of the of the present
invention. The
first thrust bearing 1106 is rotatably disposed over the main shaft 102 and is
positioned
between the support member 154 and a first thrust washer 2006. The second
thrust
bearing 1108 is disposed over the main shaft 102 on a side of the support
member 154
opposite the first thrust bearing 1106. The second thrust bearing 1108 is
positioned
between the support member 154 and a second thrust washer 2008. The second
thrust
10 washer 2008 is operably connected to a tension inducer 2018. The tension
inducer 2018
provides a force that returns the support member 154 to its neutral position
when the
transmission 2000 is not shifting. Opposite the second thrust washer 2008, the
tension
inducer 2018 may be secured to the main shaft 102, the stationary support 152
(not
shown); or other component of the transmission 2000.
1 S A first end of a tension inducer 2016 contacts the first thrust washer
2006. The
other end of the tension inducer 2016 may be secured to the main shaft 102,
the stationary
support 152 (Figure 2), or other component of the transmission 2000.
Preferably, to
minimize fi;iction, a small amount of play is allowed between the first thrust
bearing 1106,
the second thrust bearing I 108, and the support member 154.
20 Figure 21 illustrates an alternative embodiment of the invention using the
first thrust
bearing 1106 (also shown in Figure 11 ) and the second thrust bearing 1108
(also shown in
Figure 11 ). The first thrust bearing I 106 is rotatably disposed over the
main shaft 102 and
is positioned between the support member 154 and a first thrust washer 2106.
The second
thnist bearing 1108 is disposed over the main shaft 102 and positioned between
the support
25 member 154 and a second thrust washer 2108. Each of the pivot supports
134A, 1348,
134C have four extensions 2110, 2112 (Figure 24), 2114, 2116 (Figure 24) that
are
adapted to interface with the support ring 154. The extensions 2110, 2112,
2114, 2116 of
the pivot supports 134A, 1348, 134C are adapted to direct the support member
154 such
that it is constantly positioned underneath the power adjusters 122A, 1228,
122C during
30 the operation of the transmission. The first thrust washer 2106 is
positioned between the
first thrust bearing 1106 and the extensions 2110, 2112, 2114, 21 I6 of the
pivot supports
134A, 1348, 134C_ Preferably, ~to minimize fiiction, a small amount of play is
allowed
between the first thrust bearing 1106, the second thrust bearing 1108, and the
support
member 154.
CA 02559944 1998-10-22
-18-
Figure 22 shows a front elevational view of the thrust washer 2108 of the
transmission 2100 of Figure 21. The thrust washer 2108 has a plurality of
grooves on its
outer edge to prevent the second thrust washer 2108 from contacting the power
adjusters
122A, 122B, 122C during shifting.
Figures 23 and 24 show an exemplary pivot support, such as is shown in Figure
21,
wherein the pivot support is made of a two-part construction. Figure 23 is a
side
elevational view of the pivot support and Figure 24 illustrates a bottom plan
view of the
pivot support.
To form the pivot support of Figures 23 and 24, a first pivot support part
2120A
10 and a second pivot support part 2118A are pressed together. The first pivot
support
2120A and the second pivot support part 2118A are each roughly semi-
cylindrical in shape
from a top plan view. The first pivot support part 2120A includes the
extensions 2112 and
2110 (Figure 24). Further, the second support part 2118A includes the
extensions 2116
and 2114 (Figure 24).
I 5 The first pivot support part 2118A and second pivot support part 2120A may
be
fastened together by one of any number of traditional fastening techniques.
For example,
indentations 2I30A may be formed on the second pivot support part 2120A and
indentation 2134A may be formed on the second pivot support part 2118A such
that the
pivot support part 2120A and the pivot support part 2118A may be snap-fit
together.
20 Grooves 2122A on the first pivot support part 2120A are designed to allow
for the cross-
connection of each of the pivot supports in the transmission, such as by an
interconnecter
2720 (Figure 27).
Figures 25 and 26 illustrate an alternative embodiment of the stationary
support
152. The stationary support 152 has a plurality of immobilizers 2510, 2512,
2514, 2516,
25 2518, and 2520. The immobilizers 2510, 2512, 2514, 2516, 2518, and 2520 may
optionally be formed as an integral part of the Iegs I 53 of the stationary
support 152. The
stationary support 152 further includes pivot stops 2530, 2532, and 2534 that
are radially
arranged about a midpoint of the stationary support 152. The pivot stops 2530,
2532,
2534 prevent the pivot supports 134A, 134B, 134C from rotating too far and
hitting the
30 rotatable driven member 170 and/or the rotatable driving member 120.
Figures 27, 28 and 29 illustrate yet another embodiment of the stationary
support
152. Each leg 153 of the stationary support 152 has a groove 2760 that is
configured to
receive one of three immobilizers 2702A, 27028, 2702C. Each immobilizes 2702A,
2702B, 2702C includes a swivel 2730 which fits into the groove 2760. The
groove 2760
CA 02559944 1998-10-22
-19-
has a radius equal to or slightly larger than the radius of the swivel 2730.
The swivel 2730
is of a cylindrical or spherical design allowing it to rotate in the groove
2760. The ends of
the swivel 2730 are respectively connected to an angular support 2710A and an
angular
support 27108. The angular support 2710A and the angular support 27108 are
5 respectively connected, opposite the groove 2760, to the interconnecters
2720A, 27208.
The interconnectors 2720A, 27208 connect to the pivot supports 134A, 1348,
134C,
thereby anchoring the pivot supports 134A, 1348, 134C to the stationary
support 152 and
also insuring that all the pivot supports 134A, 1348, 134C rotate in unison.
The
interconnecters 2720A and 27208 fit into the grooves 2122A (Figure 23) of the
first pivot
10 support part 2120 or the apertures 142, 144 (Figure 21) of the pivot
supports 134A, 1348,
134C.
The interconnecters 2720A and 27208 are respectively attached, at an end
opposite
the angular supports 2710A and 27108, to pivot members 2740A and 27408. The
pivot
members 2740A and 27408 are respectively inserted into the apertures 142, 144
of each of
15 the pivot supports 134A, 1348, 134C thereby providing a pivot for each of
the pivot
supports 134A, 1348, 134C.
In one embodiment of the invention, the main shaft 102 may be adapted to mate
with the stationary support 152 in such a manner as to prevent the stationary
support 152
from rotating about the main shaft 102. For example, in the embodiment of the
invention
20 disclosed in Figure 27, a flat edged aperture 2780 in the center of the
stationary support
152 prevents the stationary support 152 from rotating. An exemplary main shaft
102
having an adapted outer diameter is shown in Figures 32 and 33. Further, the
flat edged
aperture 2780 enables the quick assembly of the stationary support 152 to the
shaft 102.
Alternatively, the stationary support 152 can be axed to the main shaft 102 by
traditional
25 means.
Figures 30 and 31 illustrate an alternative embodiment of the stationary
support
152 of Figures 27-29. The stationary support 152 has one leg 153. In this
embodiment,
the immobilizer 27028 (Figure 27) and the immobilizer 2702C (Figure 27) are
adapted to
be directly connected to the other pivot supports 134A, 1348, 134C in the
transmission.
30 Since the immobilizer 2702A is anchored to the main shaft 102, each of the
power adjusters
122A, 1228, 122C are also anchored to the main shaft 102 through their
connection to the
immobilizer 2702A. Advantageously, the use of one only one leg 153 reduces
manufacturing costs over those embodiments of the invention having multiple
legs.
Figures 32 and 33 illustrate an alternate embodiment of the main shaft 102.
The
CA 02559944 1998-10-22
-20-
main shaft 102 of Figures 32 and 33 may used in conjunction with various
embodiments of
the invention including the transmission 1600 (shown in Figure 16). At Ieast
one flexible
cable 1602 positioned within the main shaft 102, passes around a pulley 3212,
through a
hole 3210 and exits the main shaft 102 at one end. A fastener 3214, such as a
bolt or pin,
secures the pulley 3212 in position. The main shaft 102 has a slot 3216 that
allows the
pulley 3212 to be easily inserted into the main shaft 102 during manufacture.
Optionally,
the main shaft 102 may be strengthened in the area of the pulley 3212 by
increasing the size
of the shell of the main shaft 102. Further, the main shaft 102 can be adapted
to define a
pivot stop 3218 for the pivot supports 134A, 1348, 134C. The pivot stop 3218
acts to
IO prevent the pivot supports 134A, 1348, 134C from pivoting too far during
shifting and
hitting the rotatable driving member 120 and/or the rotatable driven member
170. Also, a
flange 3220 of the pivot stop 3218 can be used to prevent the support member
154 (Figure
2) from moving too far axially. Further, a tension inducer 2016 (Figure 20),
such as a
spring may be positioned against the flange 3220, to help keep the support
member 154
centrally positioned underneath the power adjusters 122A, I22B, I22C.
Figure 33 shows a cross section of the main shaft 102 having a flat area
formed on
the main shaft 102 to allow the flat edged hole 2780 of the stationary
supports 152 depicted
in Figures 27-31 to be quickly assembled onto the main shaft 102. However, the
shape of
the main shaft I02 and the stationary support 154 may adapted into other
mating
configurations.
Figure 34 illustrates yet another alternative embodinnent of the invention.
Figure 34
is a schematic illustration of a manual version of the transmission 1300 shown
in Figures 13
and 14. For purposes of simplicity of description, only the differences
between the
transmission 3400 of Figure 34 and the transmission 1300 of Figure 13 are
described. The
transmission 3400 includes three flexible cables 1312, 1314, and 1316 which
differ from the
transmission 1300 in that the second end of the cables extend through three
apertures (not
shown) on the main shaft 102 and enter the central passageway of the main
shaft 102. The
three flexible cables 1312, 1314, and I 316, then extend through one end of
the main shaft
102 and end at a conventional shifting actuator.
Figure 35 illustrates yet another alternative embodiment of the invention.
Figure 35
is a schematic cutaway side elevational view of a transmission 3500 that
shifts
automatically. Figure 36 is a schematic cutaway end elevational view of the
annular bearing
of the transmission 3500 of Figure 35. The features of the transmission 3500
depicted in
FiQUres 35 and 36 may be used in conjunction with the features illustrated in
Fieures 13-15.
CA 02559944 1998-10-22
-21-
The transmission 3500 includes multiple identically configured cable
assemblies,
one for each of the power adjusters 122A, 122B. 122C. However, for purposes of
simplicity of description, only one of the cable assemblies will be explained.
The flexible
cable 1316 is attached at a first end to the main shaft 102 (not shown). From
the main shaft
102, the flexible cable 1316 travels around the pulley 1310, and continues to
pulley 3520A,
attached to one of the legs 153 of the stationary support 152. After wrapping
around the
pulley 3520A, the flexible cable 1316 passes through the aperture 3614 (Figure
36) and
terminates by attaching to the second annular bearing 816. The second annular
bearing 816
is stationary and does not rotate.
From a first end that is attached to the first annular bearing 806, the
flexible cable
1532 passes through aperture 3624 and travels to a pulley 3522A From the
pulley 3522A,
the cable 1532 passes through an aperture (not shown) in the hub shell 302 to
the pulley
3524A.
In the embodiment of the invention shown in Figure 35, the first annular
bearing
806 rotates with the hub shell 302. The rotation of the first annular beating
806 is
facilitated by ball bearings 808 that are situated between the first annular
bearing 806 and
the second annular bearing 816. From the pulley 3524A, a flexible cable 1532
may pass
around one or more other pulleys (not shown) or continue directly to and
attach to the
weight 1526 (shown in Figure 15).
Figures 37 and 38 illustrate an alternative embodiment of the transmission
3700
including a coasting mechanism 3710. The coasting mechanism 3710 can be used
in
connection with bicycles, motorcycles, automobiles and machinery where
disengaging the
transmission is desired. The coasting mechanism 3710 is positioned between the
hub driver
186 and the second roller cage assembly 180. When torque is applied to the
rotatable
driven member l 70, the second roller cage assembly 180 responds by rotating
in the same
direction as the rotatable driven member 170. The rollers 112 roll up the
shallow grooves
of the rotatable driven member 170. The action of the rollers 112 causes the
coasting
mechanism 3710 to be directed toward the hub driver 186. The coasting
mechanism 3710
does not rotate with the rotatable driven member 170 because two slots 3716A
and 3716B
in the coasting mechanism 3710 engage a clutch ring 3714. The clutch ring 3714
is
frictionally attached to the main shaft 102 and has two prongs which extend
into the two
slots 3716A and 3716B of the coasting mechanism 3710. The coasting mechanism
3710
touches the hub driver 186 creating friction between the coasting mechanism
3710 and the
CA 02559944 1998-10-22
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hub driver 186. Notches 3711 may be cut on the beveled area of the coasting
mechanism
3710 to increase friction. The friction causes the rollers 112 to continue to
roll up the sides
of the shallow grooves of the rotatable driven member 170 and the coasting
mechanism
3710 until sufficient force is applied against the hub driver 186 that it
binds and rotates with
S the coasting mecharlysm.
The clutch ring 3714, then rotates with the coasting mechanism 3710. When
torque is released, a clutch tension inducer 3712 pushes the coasting
mechanism 3710 away
from the hub driver 186, disengaging the coasting mechanism 3710 from the hub
driver 186
and allowing the hub driver 186 and hub shell 302 to continue rotating.
Still referring to Figure 37, an alternative shifting method is described for
the
transmission 3700. For purposes of simplicity, only the differences between
the
transmission 3700 and other embodiments previously described will be noted.
The pivot
supports 134A, 134B, 134C, when shifted toward high cause the pivot support
legs 3730
that are attached to pivot supports to 134A, 134B, 134C, to contact and push
the first
I 5 thrust washer 2006 toward the drive side of the transmission 3700. The
movement of the
first thrust washer 2006 causes both the first thrust bearing 1106 and the
support member
154 to be pushed toward the stationary support 152. The tension inducer 2018
prevents
the support member 154 from moving too far and when the transmission 3700 is
shifted
toward low, causes the support member 154 to be pushed toward the pivot
support legs
3730.
The present invention provides a novel transmission which provides a
continuously
variable input/output angular velocity ratio offering up to a 900% range of
inputloutput
angular velocity. Further, the transmission can be actuated either manually or
automatically.
Further, the transmission of the invention provides a simple design which
requires a
minimal number of parts to implement, and is therefore simple to manufacture,
compact,
Iight and produces very little friction. The transmission eliminates
duplicate, overlapping,
or unusable gears which are found in geared transmissions. The transmission
eliminates the
need for clutches which are traditionally used for changing gears. Lastly, the
transmission
can save energy or gasoline by providing an ideal input to output angular
speed ratio.
While the above detailed description has shown, described, and pointed out
novel
features of the invention as appfied to various embodiments, it will be
understood that
various omissions, substitutions, and changes in the form and details of the
device or
process illustrated may be made by those skilled in the art without departing
from the spirit
CA 02559944 1998-10-22
-23-
of the invention. The scope of the invention is indicated by the appended
claims rather than
by the foregoing description. All changes which come within the meaning and
range of
equivalency of the claims are to be embraced within their scope.
