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Патент USA US2410402

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' NOV- 5, 1946~
_ ¿2,410,402
J. LEDwlNKA
ÀXLE SUSPENSION
2 sheets-sheet i
original Filed sept. 17, 1943
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INVENIOR
v.JosEPH _LEDwmKA
BY
f ATTORNEYv _
Nóv. 5, 1946.
J. LEDWINKA
2,410,402 -
AXLE SUSPENSION
Original Filed Sept. 17, 1943
2 sheets-sheet 2
_
INVENTOR
JOSEPH LEDWINKA
v, ¢ i
¥atented Nov. 5, ‘1946 j
' erica
siren sra'rrs
. 2,410,402
AXLE SUSPENSION
`loseph Ledwinka, `Philadelphia, Pa., assigner :to
The Budd Company, Philadelphia, Pa., a cor
poration of Pennsylvania
»
@riginal application September 17, 1943, Serial
No. 502,721. ' Divided 'and this application ‘Sep
tember 12, Iâêd, Serial No. 553,69l.
v
Clailn.
(Cl. 10S-#241i
ll
.
The invention relates to an axle 'suspension
especially for rail car trucks, and more particular
ly for the type of trucks which are mainly com
posed of high-strength sheet metal parts joined
together‘by electric resistance welding.
The features of a truck of the indicated type
are more fully disclosed in applicant’s application
Serial No. 502,721, for Railway truck, ñled Sep
tember 17, 1943, of which the present application
is a division.
An object of the invention isla spring suspen
sion which reduces the unsprung weight >and
which permits the use of wheels secured'to and
rotatable with their axles as well as the use of
wheels which are rotatable on stationary axles. '
E
.
and secured, such as by spot welding, to the plates
i9. The plates i9 and the deep channels 26 are
provided along the margins of the slot with narrow
i oiîsets 3d directed outwardly from the interior of
the respective side frame. `Cast or forged
brackets 3i are attached to the lower portions of
the bottom walls of the members Z6, 2l and serve
for the attachment of an anchor plate 32 by
means of stay bolts and nuts 33.
The brackets 3l
and the plate 32 are provided with inter-engaging
offsets sêl.
The ends of the axle l5 are, in Figures 1 and
2, rotatably supported by anti-friction bearings in
axle Aboxes 35, These axle boxes are provided
with longitudinally and vertically extending ex
tensions or fins 3e and a recess 31 on the top.
The features of the .invention as well as further
Generally U-section springs 38 of rubber or the
objects and advantages thereof will become ap
like have their inner and outer surfaces ad
parent from ther embodiment illustrated in the
hesively connected to an outer channel member
attached drawings and described in the following:
39 and an inner channel member till. The outer
20
In the drawings:
member 39 is somewhat longer than the rubber
Figure l is a fragmentary horizontal section
spring 38 and is slipped and ñts into the channel
through a truck’near one of its ends in a plane
2e so that its upper end rests against the hori-'
passing through the axis of the wheel and show
zontal member 29. 'The upper portion of the
ing the spring support for one of the axles;
Figure 2 is a section taken along line 2-2 of 25 channel in each member t@ is closed by a welded
in block (il, The axle box :il is secured between
Figure 1; and
'
and lits with its fins 35 into the channels of the
Figure 3 is a section corresponding to part of
members élll. „ The upper sides of vthe ñns at’
Figure 1 yet showing a different type of axle and
engage `the under side of the ñller pieces or
wheel support.
A
blocks
il l. A compression sandwich rubber spring
The truck frame consists mainly of two side 30
d2 is inserted between the recess 3l of the axle
frames l0 interconnected by a pair of transoms
-box 35 and the bottom of the horizontal channel
l i, part of one side frame and one transom being
member 2s and serves for the final adjustment of
shown in the drawings. i5 are the axles which
the load. The springs 38 are stressed in shear
carry the wheels IS with brake discs ll.'
Each side frame comprises two vertical plates , under the load transmitted through them "from
’ the frame it to the axle box 3e. The deflection
is which are spaced from each other and provided
is in proportion to the thickness of the rubber,
with outwardly directed flanges 20 along their
and the stress is preferably around 45 pounds
margins and around an elongated opening 2l in
their central portions. Strips 22, 23 and iidsub
per square inch,
,
’
interconnect the two plates i9 of each frame ill.
frames take their place.
It will be noted at this point that in this truck
stantially flat in cross section, are connected, 40
equalizer bars are omitted and that the side
such as by electric welding, to the ñanges 2t and
'
¿On trucks with equalizer bars, these bars rest
on top of the journal boxes and, therefore, have
system of intercommunicating closed box sec
tional girders extending nearly >throughout the 45 no spring suspension and receive all the shoclrs of
the rails, thus increasing the unsprung weight
entire'length of the frame Iû._
considerably.
At the location of the axles l5, the plates i@
Each wheel set with its axle l5 and its axle boxes
are provided with slots 25 which extend from the
35, can easily be removed by simply taking oiî
underside of the frame upwardly to a point spaced
the anchor plate 32 and by lifting the frame.
The members i9, 22, 23 and 2d form together ‘a -
from the upper side of the-frame
The plates are 50
interconnected all around said slots by Vertical
channel members 26, 2l and upper channel mem
bers 28, 29. The channel members arranged on
the same side of one slot are fastened bottom-to
Similarly, a new axle may be inserted.
Instead ofthe rotating axle as shown in. Figures
1 and 2, the same frame may be provided, without
any alterations, with the axle and wheel unit
tottom and have their side walls fitted against 55 shown in Figure 3 which comprises the arie
2,410,4oa
'
3
wheels ß with brake disc Il supported on the
axle by roller bearings “,‘and an end piece 49
which is keyed at Il to the axle, and the outer
contours of which are substantially identical with .
the contours of the axle box 35 including the pro
vision of ñns il.
.
The springs 38 do not only serve for supporting
the frame on the axle but they also transmit
stresses in longitudinal and transverse direction
4
.
ilangesconnectedtotopandbottomplates n.
Theendsoithetransoms II iitintotheopening
2| and are attached to the side frames by means
oi.' rivets (not shown) which extend through the
overlapping portions oi' the plates Il and 23 and
of the plates 15, 16.
Each» transom Il carries near each of- its ends
a bearing' 89 which supports a head of a swing
so that there is no metal-to-metal connection 10_ hanger 93, the shank of which extends through
whatever.
openings in the bearing 89, through
.
vAll minor shocks are absorbed by the described
of the walls 16 and through the space'between
Only if excessive shocks have to be transmitted,
the side walls ‘I5 of the transom il. The head
of the hanger 83 is enclosed by a casing il’. i
Each pair of links” carries in openings of
their lower ends a bridging member 84 serving
for the support of the bolster (not shown).
member t0 which extends through openings in
be understood that the invention is not restricted
rubber units and are not transmitted to the
frame. At the Sametime, the noises from the
rails through axles and wheels are prevented
from passing furti~ r by these units.
_
The invention is especially designated for high
will the axle box or its lateral ñanges engage the
strength construction, preferably of cold rolled
. onset portions 30 of the frame plates ill.
0n each side- of the truck between the wheels 20 stainless sheet steel, the parts of which are
welded together by electric spot welding. It will
it and the'transom H is a tubuiartransverse
to the speciilc embodiment illustrated in the draw
the walls I9 and is secured in the latter by metal
ings and described hereinbefore but4 that many
bushings and a rubber sleeve 6I. The outer metal
sleeve $2 is welded into the openings of and 25 modiilcations will occur to those skilled in the
art. All such modiñcations are intended to be
forms an additional transverse connection be
covered by the attached claim.
tween the plates I9. Lateral movementV of the
What is claimed is:
.
tube 80 is limited by collars 63, a removable plate
In a truck for railway cars, a frame, an end
Il at one end and a bracket (not shown) at the
other end. The tubes 60 carry brake units 69 30 supporting member for an axle such as an axle
box, vertically and longitudinally extending ñns
with cylinder, actuating arms and brake shoes
or narrow projections extending transverselyto and
'il for each wheel. The torsional forces exerted
on each side of the axle in the direction of travel
on the brake unit are taken up and the brake is
on said end member, members of resilient ma- `
held in place by a torque rod ‘H1 which is in
terial such as rubber` provided with a vertical slot
serted by means of rubber cushions l2 between
each
having their outer surfaces _and the walls
downward extensions or brackets respectively of
of said slot lined with and adhesivelv attached
the brake unit and the transom Il. This brake
to U-section metal members, said' iìns or projec
support forms the subject matter of a copending
tions of the end member fitting into and being
application Serial No. 694,796 ñled September 4,
held
by the metal members lining the slots where
40
-1946, and need not be further described herein.
as the outer metal members ’are supported in'the
Each transom H consists of two plates 'l5 which
frame.
are spaced from each other in the longitudinal~
JOSEPH LEDWINKA.
direction of the truck and have their marginal
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