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Патент USA US3067708

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Dec. 11, 1962
A. |_. LEE ETAL
3,067,698
RAIL CAR SUSPENSION SYSTEM
Filed Dec. 12, 1960
4 Sheets-Sheet l
INVENTORS
ARTHUR L. LEE
ARTHUR
B.___COVAL
/
J LVQEQ
THEIR ATTORNEY
Dec. 11, 1962
A. L. LEE ETAL
3,067,698
RAIL CAR SUSPENSION SYSTEM
Filed Dec. 12, 1960
4 Sheets-Sheet 2
INVENTORS
ARTHUR L. LEE
ARTHUR B. COVAL
BY5W.<
THEIR ATTORNEY
Dec. 11, 1962
A. L. LEE ETAL
'
RAIL CAR SUSPENSION SYSTEM
Filed Dec. 12, 1960
3,057,698
v
I
4 Sheets-Sheet 3
INVENTORS
ARTHUR L. LEE
ARTHUR B. COVAL
BY
Q
THEIR ATTQRNEY
Dec. 11, 1962
A. L. LEE ETAL
3,067,698
RAIL CAR SUSPENSION SYSTEM
Filed Dec. 12, 1960
4 Sheets-Sheet 4
INVENTORS
ARTHUR L. LEE
ARTHUR B. COVAL .
Bk
THEIR ATTORNEY
3,067,698
Unite States atent
Patented Dec. 11, 1962
2
1
In order to provide a smooth, cushioned ride, the axles
are secured to the vehicle body at the centers of the
3,067,698
RAIL EAR SUSPENSHON SYSTEM
Arthur L. Lee, and Arthur B. Coval, Columbus, Ohio,
assignors to Consoiidation Coal Company, Pittsburgh,
Pa., a corporation of Pennsylvania
Filed Dec. 12, 1960, Ser. No. 75,226
5 ?lairns. (Cl. 105-—364)
axles through resilient members which prevent any sub
stantial vertical movement of the axles relative to the
body and which tend to cushion vibrations from being
transmitted from the wheels to the body. Thus, the vi
brations induced, for example, by the connections of
one rail section to the other cannot be transmitted into
the vehicle body.
This invention relates to rail cars and more particularly
In order to further cushion the vehicle body, rolling
10
to a suspension system for a four-wheeled rail car.
In modern underground mining operations, personnel
and light equipment are transported from the entrance
of the mine to the mine working face in small, self pro
pelled rail cars.
Because of their use, these small trans
motion of the body relative to the vehicle axles is per
mitted to some degree. By rolling motion is meant the
motion of a vehicle body about an axis extending longi
tudinally through the body.
Thus, motion about the
port cars have certain characteristics which distinguish 15 roll axis will cause one side of the vehicle to dip and
the other to raise. ‘In order to provide smooth cornering
them from most rail equipment. These cars are usually
built with four wheels and have a relatively short wheel base so that the cars may negotiate curves within the
‘for the rail vehicle, it is necessary to provide some
amount of rolling motion to the body relative to the
vehicle axles.
mine. While having short Wheel bases, the cars usually
In the present invention, the connections between the
have a substantial overhang of the body over the wheel 20
vehicle axles and body, while preventing substantial ver
base at both the front and rear ends of the car in order
tical motion of the axles relative to the body, do permit
to provide maximum carrying capacity. The present in
rolling motion of the vehicle body relative to the axles.
vention is directed to an improved suspension system for
In order to control the rolling motion of the vehicle
this type of small transport vehicle. Many of the fea
body relative to the axles, large coil springs are utilized
tures of this invention are, however, applicable to other 25 to connect the outboard ends of the axles to the outboard
types of rail vehicles so that the description of the in
sides of the body.
vention with reference to a mine transport car is in
With the present invention, a smooth ?rm ride is ob
tended only by way of example and not of limitation.
tained in a transport vehicle while pitching motion of the
The scope of the invention is de?ned by the claims ap
30 vehicle body relative to the vehicle axles is substantially
pended hereto.
eliminated. While obtaining these highly desirable re
In small mine transport vehicles hitherto in use, the
sults,
the vehicle of the present invention may be con~
two axles of the vehicle have been sprung from the body
structed of a relatively small number of parts and may
in conventional manner. It has been found that when
be easily assembled. The easily assembled transport car
the axles are so sprung, severe limitations are encountered
in the use of the vehicle.
Primarily, there is a limita 35 is a highly e?icient vehicle.
tion on the top speed of the vehicle.
It has been found that when a conventional suspension
system is utilized for a small transport car, the car tends
to oscillate about the pitch axis of the vehicle as the
With the foregoing considerations in mind, it is a
primary object of the present invention to provide an im
proved rail car suspension system.
Another object of this invention is to provide a rail
suspension system for a four-wheeled rail car which
speed, increases due to small irregularities in the track. 40 car
eliminates excessive pitching motion of the rail car dur
ing operation.
parallel to the axles of the vehicle and extending ap
Another object of this invention is to provide a four
proximately through the center of gravity of the vehicle.
wheeled rail car in which substanitally no vertical move
When the vehicle oscillates about its pitch axis, the front 45
ment occurs between the body and the center of each
end of the vehicle body dips downwardly and the rear
ax e.
end raises. The rear end then dips downwardly and the
Another object of this invention is to provide a rail car
front end raises. This continual dipping and raising of
which is easily assembled from a minimum number of
The pitch axis of the vehicle may be de?ned as an axis
the ends of the vehicle result in what may be termed a
“pitching” movement of the vehicle about the vehicle 50 parts.
These and other objects achieved by the present inven
tion will become apparent as this description proceeds
Because of the relatively short wheel base of mine
in conjunction with the accompanying drawings.
transport vehicles, and because of the relatively large ‘
In the drawings:
overhang at each end of the vehicle, pitching motion of
FIGURE 1 is a perspective view of the frame and axle
the vehicle which becomes severe causes the vehicle body 55 assemblies of a rail car built in accordance with the pres
to contact the rails or ties of the track upon which the
ent invention and illustrating the novel suspension sys
pitch axis.
vehicle is moving. This contact can cause derailment of
the vehicle.
tem.
FIGURE 2 is a top plan view of the frame and axle
When severe pitching movement of a conventional
of FIGURE 1.
transport car begins to occur, the speed of the vehicle 60 assemblies
FIGURE 3 is a side elevation of the frame and axle
must be greatly reduced so that the severe oscillations are
assemblies of vFIGURES 1 and 2 showing the position oc
dampened.
The present invention contemplates a novel suspension
system which substantially prevents pitching motion of a
rail transport car even at high speeds.
cupied by the vehicle body in phantom lines.
FIGURE 4 is a partial sectional view of an axle assem
bly
taken along line 4—-4 of FIGURE 2.
Basically, the
FIGURE 5 is a sectional view through an axle assem
65
suspension system of the present invention prevents any
substantial vertical movement between the vehicle body
and the center portions of the vehicle axles. Thus, so
long as the wheels of the vehicle are on the track, the
bly taken along line 5-—5 of FIGURE 2.
FIGURE 6 is a sectional view through an axle assem
bly taken along lines 6-—6 of FIGURE 2.
Referring to the drawings, and particularly to FIG
longitudinal center line of the vehicle substantially fol
1 and 2, a vehicle frame member it} has a pair
lows the average‘elevational contour of the track and 70 URES
of
longitudinally
extending runner members 12 which
the body of the vehicle cannot oscillate about the pitch
are connected by transverse connecting members 14, 16, 18
axis and contact the rails or ties of the track.
3,087,698
3
and 2G.
4
’
'
The longitudinal runner members 12 are also
Each spring mounting means 42 has vertically extending
transversely connected by end connecting members 22. As
pilot means 42a secured thereto.
As best seen in FIGURE 4, an axle 4-4 is journaled for
shown in FIGURES 1 and 2, the frame member 10 is
constructed of lengths of hollow pipe welded together
to form the runner members 12 connected by the trans
rotation within the axle housing 36 by bearings 46. The
axle 44 has wheels 48 nonrotatably secured to each end
verse connecting members 14, 16, 18 and 20 and the end
connecting members 22. The material from which the
thereof.
frame is constructed and the manner of fastening it to
gether may be any conventional material and method.
propelled vehicle, the wheels are nonrotatably secured
to the axles. The suspension system of this invention
As shown in FIGURE 3, the frame member 19 rigidly
supports a body 24 indicated in phantom lines. The
details of the body form no part of the present inven
tion and any suitable body may be utilized.
As shown in FIGURES 1 and 2, each of the trans~
verse connecting members 14, 16, 18 and 26 has a mount
could also be utilized with a rail car which had freely
rotatable Wheels rotatably mounted on ?xed axles.
When axle assemblies 32 and 34 are positioned within
ing support receiving member 26 a?ixed thereto midway
between the longitudinal runner members 12 of the frame.
The mounting support receiving members 26 are gen
erally box-like structures which are secured to the trans
verse connecting members by supports 26a as by welding
or the like. The mounting support receiving members
are mounted in pairs so that the box-like portions of the
receiving members 26 on transverse connecting members
14 and 16 face toward each other, and the box-like por
tions of the receiving members 26 on the transverse con
Thus, two Wheels 48 and an axle 4d rotate
together as a unit.
Since this transport car is a self
the frame member 16‘, the pilot means 42a of the spring
mounting means 42 on the axle assemblies are axially
aligned with the cylindrical pilot means 28a on the spring
brace members 23 of the frame member 10. Coil springs
5t} are provided to connect the outboard ends of the axle
housings to the spring brace members 28 of the frame
it) to permit controlled rolling motion of the vehicle
body relative to the axle assemblies.
The mounting supports 38 of the axle assemblies 32
and 34 are at the centers of the respective axle assem
blies. These mounting supports 38 extend forwardly and
rearwardly into the mounting support receiving members
25 26 which are ?xed to the transverse connecting members
necting members 18 and 2t} face toward each other. As
best seen in FIGURE 5, each box-like support receiving
14, 16, 18 and 29 of the frame 16. As best seen in FIG
URE 5, resilient rubber blocks 52 are positioned above
member 26 has a cover portion 26b which is bolted to
and below each of the mounting supports 38 within the
the box-like portion of the receiving member 26. The
mounting support receiving members 26. In actual as
purpose of the box-like receiving members 26 and the 30 sembly, the rubber blocks 52 are positioned within the
cover portions 26b will be more fully described herein
support receiving members 26 along with the ends of
after.
the mounting supports 38. The cover portions 26b of
As seen in FIGURES 1 and 2, spring brace members 28
the receiving members 26 are then bolted in place.
are ?xed in place as by welding or the like between trans
The rubber blocks 52 within the support receiving
verse connecting members 14- and 16 and between trans 35 members 26 prevent any substantial vertical movement
verse connecting members 18 and 20. The brace mem
of the axle housings 36 relative to the frame 10. How
bers 28 are positioned longitudinally of the frame mem
ever, because of the relatively long lever arms from the
ber 16 so that they are generally parallel to runner mem
support receiving members 26 to the wheels 48 on each
bers 12. The brace members 28 are positioned equidis
axle assembly, some twisting of the axle assemblies 32
tantly from the support receiving members 26 on each 40 and 34 relative to the frame 10 can occur through the
side of the receiving members 26. The exact shape of
resilience of the rubber blocks 52. Thus, the frame mem
the spring brace members 28 may best be seen in FIG
ber 10 can roll relative to the respective axle assem
URE 6 which shows a side elevational view of the brace
blies 32 and 34.
member. Each of the spring brace members 28 has two
To more clearly illustrate the motions permitted by the
vertically projecting cylindrical spring pilot means 28a
suspension system of the present invention, the roll axis
formed on the underside thereof.
As seen in FIGURE 2, ?oor plates 30 may be secured
R—R and the pitch axis P—P have been indicated on
FIGURES 1 and 2. Referring to FIGURE 1, it will be
between the members of the frame 10 to provide a
seen that since the axle assemblies 32 and 34 may move
floor for the body 24 of the vehicle. The floor plates
30 are omitted from FIGURES 1, 3, 4, 5 and 6 for
relative to the frame member 10, the frame member 10
clarity.
As best seen in FIGURES 1 and 2, the frame member
10 is mounted on axle assemblies 32 and 34. The axle
assemblies 32 and 34 are identical and the manner of
may roll about axis R—R relative to the axle assemblies.
However, since the frame member 10 may not move sub
stantially relative to the axle assemblies 32 and 34 in a
vertical direction, substantially no pitching movement of
the frame member 10 about pitch axis P—P may occur.
mounting the frame 10 to each of the axle assemblies is 55
To more clearly illustrate the dampening effect of the
identical. Because of the identity of construction of
connections to prevent pitching motion, it may be seen
the axle assemblies 32 and 34, identical reference numer
that if the front end of the vehicle would tend to dip and
als have been affixed to each of the components of the
the rear end would tend to rise, the rubber blocks 52
above the mounting supports 38 of the front axle would be
axle assemblies, and only one of the assemblies will be
described in detail. The description will be equally ap 60 compressed between the supports 38 of the front axle and
plicable to either of the axle assemblies 32 or 34.
the support receiving members 26 of the front axle,
The axle assemblies 32 and 34 each have a generally
whereas the blocks 52 below the supports 38 of the rear
cylindrical axle housing 36 which may best be seen in FIG
axle would be compressed between supports of the rear
URE 4. As best seen in FIGURES 1, 2 and 5 the axle
axle and the support receiving members 26 of the rear
housing 36 has mounting supports 38 extending forwardly 65 axle.
and rearwardly therefrom. The mounting supports 38
Since the rolling motion may occur, coil springs 50 are
are perpendicular to the axle housing 36 and come to
provided between the outboard ends of the axle assem
‘ gether at their ends in a plane which also contains the
axis of axle housing 36.
In order to maintain the mount
blies and the frame member 10 to control the amount of
rolling motion. Where very little roll is desired, the coil
ing supports 38 in perpendicular relation to the axle 70 springs 50 may be made very stiff. Where slightly more
housing 36, bracing rods 46 connect the ends of the axle
roll is felt desirable, the stiffness of springs 50 may be
housing 36 to the ends of the mounting supports 38.
relaxed slightly.
On each outboard end of the axle housing 36, spring
From the foregoing description of this invention, it
mounting means 42 are secured to the housing. The
will be seen that very high speed operation of the four
spring mounting means may best be seen in FIGURE 6. 75 wheeled transport vehicle may be obtained, since slight
2
3,067,695
5
irregularities in the track will not cause pitching motions
that require speed reduction. The vehicle body cannot
member relative to said axle assemblies about a roll axis
extending longitudinally through said frame member and
oscillate about the pitch axis and contact the rails or ties
of the track. At the same time, the vehicle body is re
said mounting supports, said resilient connecting means
constructed and arranged to limit pitching motion of said
siliently insulated by the resilient rubber blocks 52 from
any small vibrations induced in the wheels. Rolling mo
tion of the vehicle body is permitted in controlled amounts
by the coil springs 50.
pitch axis parallel to said axles, and spring means con
necting each of said axle assembly spring mounting means
frame member relative to said axle assemblies about a
to said frame member to control said rolling motion of
said frame relative to said axle assemblies.
According to the provisions of the patent statutes, we
4. A four-wheeled rail car comprising a frame member
have explained the principle, preferred construction and 10 adapted
to support a rail car body, said frame member
mode of operation of our invention and have illustrated
including longitudinally extending runner members, ?rst
and second pairs of transverse supporting members ex—
embodiment. However, we desire to have it understood
tending in parallel spaced relation to each other and con
that, within the scope of the appended claims, the inven
tion may be practiced otherwise than as speci?cally il 15 necting said runner members one pair adjacent each end
of said frame member, mounting support receiving mem
lustrated and described.
bers ?xed one to each of said transverse members mid
We claim:
way between said longitudinally extending runner mem
1. A rail car suspension comprising a frame member
bers,
a ?rst pair of spring brace members extending lon
adapted to support the body of a rail car, a pair of axle
assemblies each including an axle, connecting means lo 20 gitudinally between said ?rst pair of transverse supporting
members, a second pair of spring brace members extend
cated midway between the ends of said axle assemblies
ing longitudinally between said second pair of transverse
for connecting each of said axle assemblies to said frame
supporting members, a pair of axle assemblies, each of
member, said connecting means permitting rolling motion
said axle assemblies including an axle housing, axle hous
of said frame member relative to said axle assemblies
about a roll axis normal to said axles and extending longi 25 ing mounting supports projecting forwardly and rear
wardly from said axle housing in directions perpendicular
tudinally through said frame member so that there can be
to said axle housing, an axle journaled for rotation within
substantial vertical movement between the ends of said
said housing, a pair of wheels nonrotatably secured one
axle assemblies and the outer extremities of said frame
to each end of said axle, and spring mounting means
member overlying said axle assembly ends, said connect
and described what we now consider to represent its best
ing means including means to prevent substantial vertical 30 formed at the outboard ends of each of said axle assem
blies, said axle assemblies and said frame member ar
movement of said frame member relative to each of said
ranged so that said axles extend parallel to said frame
axle assemblies midway between the ends of said axle
member transverse supporting members and said axle
assemblies, and spring means connecting each of said
assembly mounting supports extend parallel to said frame
axle assemblies to said frame member to control said
grilling motion of said frame relative to said axle assem 35 member runner members, the ends of said axle assembly
res.
2. A rail car suspension comprising a frame member
adapted to support the body of a rail car, a pair of axle
assemblies each including an axle housing having for
t-e
wardly and rearwardly projecting mounting supports lo
cated midway between the ends of said axle assembly
mounting supports being received within said transverse
supporting member mounting support receiving mem
bers, resilient connecting means connecting said mounting
supports to said mounting support receiving members,
40 said resilient connecting means permitting rolling motion
of said frame member relative to said axle assemblies
about a roll axis extending longitudinally through said
frame member and said mounting supports, said resilient
connecting means constructed and arranged to limit
axle housing mounting supports to said frame member,
said resilient connecting means permitting rolling motion 45 vertical motion of said frame member relative to each
of said axle assemblies, and spring means connecting each
of said frame member relative to said axle assemblies
of said axle assembly spring mounting means to said
about a roll axis extending longitudinally through said
frame member spring brace members to control said
frame member and said mounting supports, said resilient
rolling motion of said frame relative to said axle assem
connecting means adapted to prevent substantial pitching
motion of said frame member relative to said axle as 50 blies.
5. A four-wheeled rail car comprising a frame member
semblies about a pitch axis parallel to said axles, and
adapted to support a rail car body, said frame member
spring means connecting each of said axle assemblies to
including longitudinally extending runner members, ?rst
said frame member to control said rolling motion of said
and second pairs of transverse supporting members ex
frame relative to said axle assemblies.
3. A four-wheeled rail car comprising a frame member 55 tending in parallel spaced relation to each other and con
necting said runner members one pair ‘adjacent each end
adapted to support a rail car body, a pair of axle as
of said frame member, mounting support receiving mem
semblles each including an axle housing having forwardly
bers ?xed one to each of said transverse members mid
and rearwardly projecting mounting supports and an axle
way between said longitudinally extending runner mem
journaled for rotation within said housing, a wheel non
rotatably secured to each end of said axle, said axle as 60 bers, said mounting support receiving members ?xed to
said ?rst pair of transverse supporting members arranged
semblies including spring mounting means formed at the
to face toward each other, said mounting support receiv
outboard ends of each of said axle assemblies, said frame
ing members ?xed to said second pair of transverse sup
member having a ?rst pair of transverse supporting mem
porting members arranged to face toward each other, a
bers extending in parallel, spaced relation to each other
and an axle journaled for rotation within said housing,
resilient connecting means for connecting each of said
adjacent one end of said frame member and a second 65 ?rst pair of spring brace members extending longitudinally
pair of transverse supporting members extending in paral
lel, spaced relation to each other adjacent the other end
of said frame member, said ?rst and second pairs of
between said ?rst pair of transverse supporting mem
bers, a second pair of spring brace members extending
longitudinally between said second pair of transverse
supporting members, a pair of axle assemblies, each of
transverse supporting members having mounting support
receiving members ?xed thereto in longitudinal alignment 70 said ‘axle assemblies including an axle housing, axle
housing mounting supports projecting forwardly and rear
with each other, said axle housing mounting supports ex
wardly
from said axle housing in directions perpendicular
tending into said mounting support receiving members, re
to said axle housing, an axle journaled for rotation with
silient connecting means connecting said mounting sup
in said housing, ‘a pair of Wheels nonrotatably secured
ports to said support receiving members, said resilient
connecting means permitting rolling motion of said frame 75 one to each end of said axle, and spring mounting means
3,067,698
formed at the outboard ends of each of said axle assem
blies, said axle assemblies and said frame member ar
ranged so that said axles extend parallel to said frame
member transverse supporting members and said axle
axle assemblies about a roll axis extending longitudinally
through said frame member and said mounting supports,
said resilient connecting means constructed and arranged
to limit vertical motion of said frame member relative to
assembly mounting supports extend parallel to said frame 5 each of said axle assemblies, and spring means connecting
member runner members, the ends of said axle assembly
each of said axle assembly spring mounting means to said
mounting supports being received within said transverse
frame member spring brace members to control said
supporting member mounting support receiving mem
rolling motion of said frame relative to said axle assem
bers, resilient connecting means connecting said mount
blies.
ing supports to said mounting support receiving members, 10
References Cited in the ?le of this patent
said resilient connecting means being formed of blocks
UNITED STATES PATENTS
of rubber mounted Within said mounting support receiv
ing members above and below said axle assembly mount
ing supports, said resilient connecting means permitting
rolling motion of said frame member relative to said 15
1,508,123
Ramsey ______________ __ Sept, 9; 1924
1 2,138,484
Eustis _______________ __ Nov. 29, 1938
2,630,081
Kepner ______________ __vMar; 3, 1953
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