Note: Descriptions are shown in the official language in which they were submitted.
074153-BWL
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The invention herein relates to the field of
universal joints and more particularly to constant velocity
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universal joints.
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~ It is known in the prior art (for example, U. S.
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'fi'! Patent 3,125,870) to have a unlversal joint having only
.~ three trunnion members mounted at an acute angle on a
driving shaft having partial ball members rotationally
';~ and slidably mounted on the trunnions and received in
,; cooperating grooves on the driven shat, the trunnion
, members and the grooves extending at an acute angle with
respect to the shafts to provide a constant velocity
universal joint. It has been recognized in this type of
universal joint that the trunnions or shafts mounting the
~, partial ball members are subject to distortion under torque
load since the auter ends thereof are unsupported and tor~ue
is applied thereto only at the inner end where connected
,,;~ to the shaft.
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Accordingly, it is an ob~ect o~ the present
invention to provide a constant velo~ity universal` joint
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, o~ the type described wherein there is no distortion under
substantial torque loads, yet considerable angularity
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, between drive and driven shafts is permitted.
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' It is an additional object of the present
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invention to provide a constant velocity universal joint of
the type described including a means to support and apply
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~ torque to the outer or remote ends of the trunnions.
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According to the present invention, there is
provided a universal joint for the transmission of torque
between two shafts, the joint including a first member
coupled to one of the shafts and a second member coupled .
~: to the other of the shafts with at least three supports ;
connected to the first member at a first acute angle with
:~ respect to the one shaft. The supports have an end remote
from the first member, and a coupling member is rotatlonally
and slidably mounted on each of the supports. The second
~.. 10 member has at least three grooves therein extending at a
i-. second acute angle with respect to the other shaft, and
.`. the coupling members are received within the grooves so
` that torque can be transmitted between the shafts when
the shaf-ts intersect at an angle. A torque transmitting
~ member extends between the one shaft and the remote end
; of the supports for transmitting torque to the r~mote end.
.1 In a specific emhodiment of the present invention
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,.1 the above-desired objects are ach.ieved i.n a constant
!1 velocity joint of the type described by providing a torque ;; :
1 20 transmitting member connected to a shaft and the romote end
of the trunnion members, the universal joint having at least
three trunnions extending at an acute ang:le wi.th respect
to the sha~t and havin~ slidable and rollable partial ball
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; members mounted th~reon :Eor transmiss:io.n O.e to.rque. Th~ `~
torque transm~tt.in~ membe.r :is secured to its shaft and has
bores therein to receive the remote ends of the trunnion
members SUCIl that torque is applied to the trunnion members :::
.~ at both ends ther~of to increase the torque capacity of
: the universal joint and, at the same time, prevent ~ :
. .30 distortion of the trunnion members at higher torque loads.
.: In the accompanying drawings:
FIGURE 1 shows in perspective view a universal
joint of the type described herein; and :
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- FIGURE 2 shows a partial cross-sectional view
of the joint of FIGURE 1 embodying the principles of the . .
present invention. .
Referring to FIGURES 1 and 2, a universal joint
10 is illustrated which is self supporting and adapted to
, provide for constant velocity drive between a shaft 12 and
a shaft 14. As will be described in greater detail, the
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074153-BWL 1063372
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' present universal joint drivingly interconnects the shafts
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12 and 14 such that when they are rotated with their axes
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at any angle up ~o the maximum permissible joint angle,
the angular velocity of the two shafts is always exactly
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the same regardless of the position in a rotational cycle
of 360 . Thus, the universal joint 10 always provides what
is commonly referred to as a "constan~ veloci~y" drive as
distinguished from drives provided by "non-constant velocity"
universal joints which are of many types and well known in
the field. Thus, when reference i5 made to the present
universal joint 10 as a constant velocity joint, the above
definition is intended. In addition, it is to be noted that
the shafts 12 and 14 are not referred to herein as driving
or driven shafts specifically, it being understood that the
ha~ts may be alternately driving or driven shafts when
the joint 10 is in operakion, depending upon the direction
of torque transfer.
Connected to shaft 12 is a member 1~, and connected
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to shaft 14 is a member 17. Member 16 has mounted therein a
;~ plurality of support members or ~runnions 20 which have
a central longi~udinal axis 21 which ex~ends at an acute
~ angle "a" with respect to a longitudinal axis 24 of shaft 12.
; ~runnions 20 have an inner end portion 22 and an outer or
remote end portion 23. Member 17 has a hub portion 18
connected to shaft 14 and a conical flared portion 19
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extending toward driving shaft 12. Provided in portion 19
are a plurality of grooves 28 which are partly cy}indrical
`~ in form, ~he number of grooves 28 corresponding to the
cylindrical surfaces 30 on either side thereof. ~he
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~ 074153-BWL 1063372
grooves 28 have a longitudinal central axis 32 which extends
at an acute angle "b" with respect to a lonyitudinal
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central axis 34 of shaft 14.
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,, A coupling member or partial ball member 40 is
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provided on each of the trunnions 20, the members 4Q are
illustrated as having centrally thereof needle bearings 42
mounting the coupling members 40 on the trunnions 20.
The coupling members 40 are adapted to rotate with respect
to trunnions 20 and may also slide with respect to the
trunnions 20 up and down along longitudinal axis 21.
The coupling members 40 have a generally spherical surace
44 thereon which has a radius substan~ially similar to
the radius o the surfaces 30 of groove; 28 to provide
for proper cooperative action therebetween.
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In a preferred embodiment of the present
invention, the acute angles "a" and "b" would be equal to
obtain a non-orbitting, self-suppor~ing, homokine~ic constant
velocity join~ with axial freedom and to permit more ~han
three coupling memb~rs i~ desired. When torque is trans-
mltted between the shafts, drive will be transmitted through
the medium of the ball members 40 and the grooves 28 from
the shaf~ 1~ to sha~t 14. In FIGU~E 2, the shafts 12 and
14 are shown in alignment with their axes 24 and 34 co-
incident. However, when such axes would join at an angle
as, for example, illustrated in FIGURE 1, when the driving
shaft rotates, the drive will be transmitted to the driven
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074153-BWL
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shaft through the medium of the ball members 40 and grooves
28, the balls accommodating the unviersal action by rolling
and sliding on the trunnions 200
Although as described above, the ball members 40
have internally thereof needle bearings 42; it will be
obvious to those of ordinary skill in the art that the
ball members 40 may, if desired, be mounted directly on
the trunnions 20 without the inclusion of bearings of any
typ~.
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A torque transmitting member 50 is provided which
is connected to shaft 12 as, for example, by splines 52.
The torque transmitting member 50 is generally cup-shaped
~j having a generally radially extending portion 54 having the
splines 52 thereon and a generally axially extending portion
; 56. A supporting portion 58 is provided on the axially
extending portion 56 which has a plurality of bores or
apertures 60 therein. A bore 60 is provided for each o~
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the trunnion members 20 and adapted to receive same. ~s
i;; will be apparent, when torque is applied to sha~t 12,
i for example, the torque will be applied to the trunnion
members 20 both through member 16 to the inner end 22 of
~;j trunnions 20 and through torque transmitting sleeve S0 to
the outer or remote end 23 of trunnions 20.
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With the construction provided by the present
invention, it will be apparent that torque is applied to
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. the trunnions 20 at either end thereof. Thus, trunnions
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20 are properly supported to prevent distortion of the
trunnions under laod and the torque capacity of the joint
10 is enhanced by applying torque to the trunnions 20 at
either end thereof.
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As illustrated in ~IGURE 2, a flexible rubber
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boot 70 may be provided to seal the universal joint against
dirt or other contaminants in operation, the boot 70 flexing
when the shafts 12 and 14 intersect at an angle. The boot
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; 70 is secured to sleeve 50 by a band 72.
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As will be apparent, other forms of connection
between torque transmitting member 50 and shaft 12 may be
provided as, or example, the portion 54 could be welded
to shaft 12 to provide a strong driving connection there-
between. Also as indicated in FIGURE 2, the trunnions 20
comprise shafts or pins mounted in the member 16. Trunnion
members 20 could be secured to member 16 by weldi.ng and/or
other known technîques. ~s illustrated in the preferred
embodiment, the trunnions 20 are four in number. A workable
joint may alco be provided by utilizing only three trunnions,
if desired.
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In FlGURE 1~ a perspective view is given o~ the
universal jolnt 10 of the present invention wherein the
boot 70 and the torque transmitting member 50 are removed
i to clearly illustrate the con truction of the present device,
074153-BWL
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and it is to be recognized that FIGURE 1 illustrates the
embodiment of FIGURE 2 with member 50 removed.
, i . From the above, it will be apparent that the
present invention provides a unique constant velocity uni- :
versal joint in which three or more trunnion or pin members
are used having a rollable, slidable ball member mounted
thereon wherein distortion of the pins or ~runnions is
prevented by providing a torque driving connection at
. either end o~ the pins so that the pins are properly
supported and prevented from changing angle with respect
to their shsft.
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