BRAKING SYSTEM IN A RAILWAY CAR

SYSTEME DE FREINAGE POUR VOITURE DE CHEMIN DE FER

English Abstract

BRAKING SYSTEM IN A RAILWAY CAR
Abstract of the Disclosure
A braking system for a railway car with a pair of side
frames for receiving two axles is disclosed wherein two disc brakes
are connected to each of the two axles. The braking system
includes two actuators for engaging the disc brakes and each of the
actuators are disposed on opposite sides of the axles in a
staggered relationship in order to provide open areas between the
axles and a centrally disposed transverse connecting member of the
railway car. The braking system is thereby provided with improved
access for its maintenance.

Claims

THE EMBODIMENTS OF THE INVENTION IN WHICH AN EXCLUSIVE
PROPERTY OR PRIVILEGE IS CLAIMED ARE DEFINED AS FOLLOWS:
1. In an inboard railway truck including a pair of side
frames for receiving two axles each having two wheels connected
thereto and having a centrally disposed transverse member connect-
ing said side frames, a braking system comprising: (a) two disc
brakes including discs connected to each of said two axles;
(b) said disc brakes including two actuators for engaging said
discs; (c) the actuators on each axle being disposed on opposite
sides of the axle and each actuator being disposed at a side of
the respective disc, which side is facing away from a nearer
wheel on the axle; and (d) tread brakes disposed outside of said
side frames between said wheels and the center line of the truck.
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Description

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The application is a divisional of Canadian appl.ication
No. 472,466 filed on January 21, 1985 by the Budd Company.
This invention relates to railway cars, and in particu-
lar, to a braking system used therein.
It is an object of this invention to provlde a brakiny
system for railway cars which permits improved acce~s Eor the
maintenance of the braking system.
According to the present invention, there is provided
in an inboard railway truck including a pair of side frames for
receiving two axles each having two wheels connected thereto and
having a centrally disposed transverse member connecting said side
frames, a braking system comprising: (a) two disc brakes includ-
ing discs connected to each of said two axles, (b) said disc
brakes including two actuators for engaging said discs; Ic) the
actuators on each axle being disposed on opposite sides of the
axle and each actuator being disposed at a side of the respective
disc, which side is facing away from a nearer wheel on the axle;
and (d) tread brakes disposed outside of said side frames between
said wheels and the center line of the truck.
The invention will be described in greater detail with
reference to the accompanying drawings, in which:
Figure 1 is a top view of a railway truck, in accor-
dance with the present invention; and
Figure 2 is a cross-sectional view taken along lines
2-2 of Figure 1 illustrating the truck and showing additional
elements not included in Figure 1.
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DESCRIPTION OF THE INVENT~ON
Referriny to Figure 1, an inboard truck 10 includes
side frames 12 and 14 connected by a spider-like centrally dis-
posed transverse member 16. Sliders 18 and 20 are disposed under
a bolster 22.
A typical inboard truck 10 provides considerably less
room than an outboard truck between the side frames 12 and 14 and
in the areas between the axles of the wheel-axle units 17 and 19
and center portions of the truck 10. In order to provide a maxi-
mum open area for maintenance of the braking system, a staggeredbraking arrangement illustrated is employed.
Axles 24 and 26 are connected through journal box
assemblies which are secured to the ends of the side frames 12 and
14. The journal box assembly may be of the type illustrated in
a patent 4,338,865 issued July 13, 1982. The axle 24 includes
wheels 28 and 30. The axle 26 includes wheels 32 and 34.
Tread brakes 36, 38, 40 and 42 are disposed to apply
braking forces to the wheels 28, 30, 32 and 34, respectively. All
of the tread brakes are disposed between the wheels and the bol-
ster 22. This has the advantage that the tread brakes do notoverhang and lengthen the length of the truck on the exposed side
outside of the side frames.
Disc brakes include two actuators 44 and 46 for the
discs 48 and 50 mounted to the axle 24. The actuators are disposed
on opposite sides of the axle 24 and each actuator 44, 46 is dis-
posed at that side of the disc 48, 50 ~hich faces awa~ from the
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nearer wheel 28, 30 on the axle. Similarly disposed disc brake
actuators 52 and 54 for discs 56 and 58 are mounted to the axle
26.
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The staggered arrangement of the disc brakes 44, 46, 52
and 54 provides space inside of the a~les 24 and 26 between the
axles and center of the truck to permit ~aintenance -to be per-
formed on the brakes.
Referring to Figure 2, additional elements not illu.s-
trated in Figure 1 include a car body 60 supported -through a pair
oE mounting members 62 and 64 by mechanical springs disposed with-
in spring seats, such as spring seat 66 on the bols-ter 22.
The mechanical springs comprise two pairs of springs 68.
70 and 72, 74. The inner springs 70 and 74 are disposed within
the outer springs 68 and 72.
A pair of lateral bumpers 76 and 78 are connected to the
bolster 22 between stop or limiting members 80 and 82, respec-
tively. These bumpers and stop members limit the lateral move-
ments of the car body 60 with respect to the truck 10.
Many details associated with the truck 10 are not illus-
trated or described in detail because they are conventional and
only indirectly related to the present invention.
The mounting members 62 and 64 are substantially the
same and both operate in similar manners. Therefore, only the
member 62 will be described in detail, i~ being understood that
the description also applies to the mounting member 64.
The mounting member 62 is disposed on top of the
mechanical springs 68 and 70. A top plate 84, having a central
opening therein, includes a downwardly extending cylindrical piece
86 secured thereto. The top plate 84 engages the botto~ portion of
the car body 60. The cylindrical piece 86 extends downwardly

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between the mechanical springs 68 and 70.
A bottom plate 88. having a central opening therein
larger than the opening in the top plate 84, includes a downwardly
projecting cylindrical piece 90 secured thereto. The piece 90
extends downwardly between the mechanical springs 68 and 70.
The top plate 84 and bottom plate 88 are spaced from
each other to receive an elastomeric ring 92 therebetween, Like-
wise, the inner and longer cylindrical piece 86 is spaced from the
outer and shorter cylindrical piece 90 to receive an elastomeric
ring 94 therebetween.
The elastomeric rings 92 and 94 are disposed to provide
isolation and damping between the springs 68, 70 arid the car body
60. The elastomeric ring 92 provides damping of vertical vibra-
tions and spring surges developed in the mechanical springs 68 and
70 and prevents the vibrations from being transmitted into the car
body 60. The elastomeric ring 94 provides damping of lateral
vibrations and spring surges in the spring 68 and 70 and prevents
the vibrations from being transmitted to the car body 60.
The advantage in having the mounting means on top of the
springs is that isolation for the car body is provided to prevent
vibrations from the springs and the truck. In some cases, the
mounting means nay be disposed on the bottom of -the springs. In
; this case, the springs will be isolated from the track. Also.
mounting means may be provided on the tops and bottoms of the
springs to further damp any vibrations in the truFk and springs.
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