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Publication
_________________________________________________________________
Number GB403553A
i»?
Title
_________________________________________________________________
EN Title Improvements in elastic wheels for railway vehicles
Abstract
_________________________________________________________________
9489 and 9490.
Convention dates, March 29, 1932 andJan.
9,1933.
[Class 144 (i).] The tyre A of a railway wheel is supported from the
rim B <1> by a rubber cushion and is formed with a web A <1> which is
clamped, through other cushion elements, between the wheel body B and
a detachable flange D.
In the form shown in Figs.
1, and 2 the main cushion C consists of a one-piece ring, the web A
<1> being spaced from the wheel and flange D by rubber washers C <1> ,
C <2> which also cushion the web on sleeves F fitted on the
attachment-bolts.
Axial pressure may be applied to the cushion C by means of bolts H and
a thrust ring or segments G.
In the modification shown in Fig.
3, the main cushion
cushioning-elements
fibre or rubber of a
c <4> , and separate
consists of a series of rings c <1> ..c <4> , the
for the web A <1> comprising washers a, b, of
different quality from that of the rings c <1> ..
rubber collars e fitted between the sleeves F, f.
The main cushions may be formed in segments, or by a helical winding.
Description
_________________________________________________________________
to l I -;Ad L \_ l 3 4 lot
PATENT SPECIFICATION
403,553 Convention Dates (France) March 29, 1932:
Jan 9, 1933:
Corresponding Applications in United Kingdom 9489/33 9490/33 f Dated
March 29, 1933 (One Complete Specification Left)
Accepted: Dec 28, 1933.
COMPLETE SPECIFICATION.
Improvements in Elastic Wheels for Railway Vehicles.
I, ETTOR:E BU Gr T Ti, a Subject of the King of Italy, of Molsheim,
Bas- Rhin Department, France, do hereby declare the nature of this
invention and in what S manner the same is to be performed, to be
particularly described and ascertained in and by the following
statement:There are wheels for railway vehicles, the metallic tire of which is
connected to the central portion of the wheel through an elastic
material, for instance wood, fibre, rubber, etc, in order to deaden
the vertical shocks due to unevenness of the rails.
Transverse shocks are supported in said wheels by flanges which either
are integral with thel central portion of the wheel, or come into
contact with said portion of the wheel when the axle is moved in a
transverse direction These transverse shocks and the noise produced by
the rubbing of the flange against the rail-head are, therefore,
directly transmitted to the central portion of the wheel.
It results therefrom that in arrangements of that kind the roiling
portion, of the 'vehicle is very noisy.
There are also wheels for railway vehicles in which a false rim of
double T-shaped section is made rigid with the tire, one or more
rubber 'blocks being interposed between said false rim and the hub The
false rim has its web apertured to provide for the passage of bolts
with sleeves forming distance pieces between radial flanges rigid with
the hub, rubber rings being arranged between the web and the flanges
This prior construction, owing to the presence of the false rim and to
the fact that the rubber blocks are in the vicinity of the centre of
the hub, also to the fact that the apertures in the webl are actually
large, results in a wheel whereof the tire floats on the hub.
Moreover in the last-named wheel as in wheels of the type above
mentioned, the driving torque and the braking torque are transmitted
through the elastic material inserted between the tire or the false
rim and the hub, said material lPrice 1/-l being generally connected
with the hub and with the false iim or the tire merely by adhesion.
Another drawback of the wheels of the type above referred to lies, in
the lack 55 of means that permit of accurately centreing the tire with
respect to the central portion of the wheel Such wheels are,
therefore, unbalanced, which is very detrimental to smooth running and
60 safety; especially in the case of vehicles adapted to run at hig'h
speeds This want of balance is still further increased by the
deformation and the deterioration of the elastic material that is
being used due to 65 heating.
The object of the present invention is to provide a wheel for railway
vehicles which obviates these drawbacks, and the metallic tire of
which is fixed to the cen 70 tral portion of the wheel by means of an
elastic material in such manner as to meet the following requirements:
1 Vertical shocks and vibrations are deadened; 75 2 1-lorizontal
(transverse) shocks and vibrations are deadened:
3 The tire is elastieallv but positively driven by the central portion
of the wheel in the case of driving wheels, or inversely, 80 the
central portion is driven in the same way by the tire during the
braking period, 4 The tire is accurately and easily centred with
respect to the central portion 85 of the wheel in order to obtain well
balanced complete wheels; Sufficient safety is ensured in case of
deterioration of the elastic material; 6 The tire together with its
flanges and go the elastic material can be easily and rapidly
replaced, said parts being the only ones that are liable to wear and
tear; 7 A good protection against the noise produced by the running of
the tire on the 95 rail and the rubbing of the flange against the
rail-head is obtained.
An essential feature of a wheel according to this invention is that
the tire, which rests on the rim through the 100 Price 4 S 6 d 'I
/-,-i 1 I-:-i; medium of an elastic cushion, such as an elastic ring,
is provided with an inwardly projectingo-rib, which is held between
two cheeks rigidly fixed to or integral with the central portion of
the wheel by means of elastic fittings, the tire and the central
portion of the wheel being thus connected together, for instance by,
means of bolts surrounded by elastic sleeves.
1 o According to a further feature of this invention one of the
fittings interposed between the rib and one of the cheeks, for
instance the web of the wheel, leas projecting portions which are
provided with holes for the bolts that connect the web and the rib,
such projections engaging in the holes of the rib to provide the
sleeves above referred to.
Furthermore, the inwardly projecting rib instead of being continuous,
may be divided into a plurality of portions.
Also the elastic cushion or ring may be divided into a number of
portions and may be more or less compressed byv means 2 f of a
lateral, circular or segmental structure controlled by suitable means.
In
addition,
stops are provided for li Tm-itin the relative
displacement of the tire and the central portion of the wheel, more
especially in the event of injury to the elastic material.
It should be noted that the elastic elements that form the wheel above
deseribed have to perform three different 2; functions:
1 To support the radial load; 2 To withstand the axial stresses; 3 To
cooperate in driving the wheel.
These considerations have led me to provide another embodiment of my
invention, in which the various elastic elements nra made of materials
having different properties so as to take into account the kind of
work they have got to do For instance, I may use rubber of varying
hardnesses, a rubber more or less reinforced, or substances of
different kinds such as rubber for the radial load and for the
driving, and fibre for the axial wo thrusts.
On the other hand, it should be noted that the accurate centering of
the tire with respect to the central portion of the heel, which is
necessary if high speeds of revolution are to be reached, depends on
the elastic ring interposed between the inner surface of the tire and
the corresponding flange of the central portion of _ the wheel, or of
the cheeks that are integral therewith.
Now, the difficulty of producing accuratelv balanced and well centered
vehicle wheels is known to those skilled in the u art It results in
particular, from lee M lack of homogeneity of the elastic material
that is used In order to obvia Le this drawback, according to another
embodiment of my invention, the elastic ring above referred to is made
of several similar or equal parts Thus I may form 6 the ring either of
several juxtaposed annular portions, or of several segments placed end
to end, or again of a band wound so as to form contacting or
noncoutacting turns 75 Owing to that division of the ring into a
plurality of parts, it is possible for -he manufacturer, by suitably
distributing said parts, to compensate for inequalities resulting from
differences in the manu 80 facture.
Preferred embodiments of mv invention will be hereinafter described
with reference to the accompanying drawings given merely by way of
example, and in which Fig 1 is an axial section view on the line 1-1
of Fig 2; F:'ig 2 is an elevational view of a portion of the wheel
according to ma invention; Fie 3 is a view similar to Fig 1 show 90
ing another embodiment cf my invention; Fig 4 is an elevational view
of an elastic ring consisting of two annular elements of defective
shape 95 Figs 4 a and 4 b are diametrical seetional views of said
annular elements respectively before and after their being compressed
between the elements of the wheel that surround them; L O Fig 5 is an
elevational view of a portion of an elastic ring made of several parts
Fig 5 a is a sectional view on the line a-5 a of Fig 5 105 Fig 6 is an
elevational view of another type of elastic ring; Fig 7 is a sectional
view of the ring of fig 6.
As shown in the embodiment of Fig 1, 110 the metallic tire A is
provided with an inwardly projecting rib A 1 Said rib is provided from
place to place with holes I.
Of course, the rib is not necessarily a continuous whole, but may be
divided into 115 portions In said holes I are engaged bolts E which
serve to connect the web B of the wheel and the annular fixation cheek
D together Said bolts are surrounded with bracing members F The 120
rib A' is held between elastic fittings C' and C 2 The fittings C' may
be provided with projections which engage in the holes I and act as
elastic sleeves interposed between the edges of said holes and 125
braces F The tire A rests on the rim B' bv means of an elastic ring C,
preferably slit or even divided into several portions.
Said ring is applied on ihe one hand against fittings C', and on the
othe T hand 403,553 403,553 against annular or lateral segments G, the
position of which is determined by bolts H or equivalent means Of
course, the elastic elements C, C', Co may be made of acii suitable
material; the elements C anld C' may be made in a single unit, being
for instance moulded.
It will be noted that just the necessary clearance space is provided
between the tire A and the web B on the one hand. and between the rib
A' and the horizontal edg'e of the cheek D on the other hand, in order
that in case the elastic elements become deteriorated, the collapse of
the wheel may be limited.
It should be understood that details of the embodiments above
described could be modifiled without departing from the principle of
my invention For instance in order to facilitate the centreing and the
ibalancing of the wheel, which are modified by acting on the bolts H
and E, a set of bracing members F of diffetent lengths can be
utilised.
In the embodiment shown in Fig 3, the elastic ring which was
designated by reference letter C in Figs 1 and 2, is now formed by a
plurality of juxtaposed rubber rings cl, C 2, c 3, c 4 On either side
of the rib A' are provided annular members a and b respectively which
are interposed between said rib and web B and cheek D respectively
Said annular members a and b are made, for instance, of fibre or
indiarubber of a quality different from those of rings cl, cs etc, or
of any other suitable elastic material.
The parts drive one another through rubber rings e inserted between
metallic braces F and supplementary sleeves f of smaller length than
the braces F, so as to permit the rings a and b to perform the
function for which they are intended.
It is possible that inequalities may appear between the elements cl, c
2, etc. that form the elastic ring c, in the course of their
manufacture In this case they are compensated by effecting the
mounting of the ring in a manner which will be described with
reference to Figs 4) 4 D and 4 b.
For
the
sake of clearness, I will consider only two rings cl and o 2
and I will M 5 suppose that due to their defective moulding the walls
of the rings are limited by two cylinders which are not coaxial The
rings cl and c 2 are disposed on the member tb so that they are turned
through 1800 00 (or more generally 360 when N rings are utilised) with
reference to one another.
The tire A is now placed in position and the rings are compressed as
shown in Fig.
4 b, so that the in equalities are compeusated, 65 The elastic ring
may also be divided into a plurality of segments such as p', g 2, etc,
in Figs 5 and 5 a but in this case the compensation of the
inequalities in order to produce a good centreing is 70 obtained by
suitably interchanging said segments Of course, this division into
segments might be employed to a greater or less degree with a ring
already divided into a plurality of annular elements 75 As shown in
Figs 6 and 7, the ring could be formed from a band of rubber h, wound
around the member B in contacting or non-contacting turns.
While I have described what I deem to 8 l be practical and efficient
embodiments of my invention, it should be well understood that I do
not wish to be limited thereto as there might be changes made in the
arrangement, disposition and form 85 of the parts without departing
from the principle of my invention as comprehended within the scope of
the appended claims.
1 raving now particularly described and go ascertained the nature of
my said invention and in what manner the same is to be performed, I
declare that what I
Claims
_________________________________________________________________
claim is:1 An elastic wheel especially adapted 95 for railway vehicles,
characterised by the fact that the tire, which rests on the rim
through the miedium of an elastic cushion such as an elastic ring, is
provided with an inwardly projecting rib, which is held 100 between
two cheeks rigidly fixed to or integral with the central portion of
the wheel by means of elastic fittings, the tire and the central
portion of the wheel being thus connected together, for 105 instance
'by means of bolts surrounded by elastic sleeves.
2 An elastic wheel according to Claim 1, characterised by the fact
that one of the fittings interposed between the rib and 110 one of the
cheeks, for instance the web of the wheel, has projecting portions
which are provided with holes for the bolts that connect said web and
the rib, said projections engaging in the holes of 115 said rib so as
to form the sleeves stated in Claim 1.
3 An elastic wheel according to Claim l or 2, characterised by the
fact that the inwardly projecting rib, instead of being i 20
continuous, is divided into several separate portions.
4 An elastic wheel according to any of the foregoing claims, in which
the elastic cushion or elastic ring is divided 125 into separate
portions.
5 An elastic wheel according to any of the foregoing claims, in which
the elastic cushion may be more or less compressed bv means of a
lateral, circular or segmental structure controlled by suitable means
6 An elastic wheel according to any of the preceding claims,
characterised by the fact that stops are provided for limiting the
relative displacement of the tire and of the central portion of the
wheel, in particular in the event of injury to the elastic material.
7 An elastic wheel according to any of the preceding claims,
characterised by the fact that the different elements of the elastic
part of the wheel are made of different materials, or of a material of
the same nature but of different hardnesses in accordance with the
work to be performed, for instance of indiarubber, for the parts that
undergo radial stresses and those that co-operate in the driving
action, and of fibre or of a rubber of a different quality for those
that undergo axial thrusts.
8 An elastic wheel according to any of the preceding claims,
characterised by the fact that the elastic sleeves inserted between
the fixation bolts and the rib, consist of rubber rings, each
surrounded by a metallic sleeve and surrounding said bolts, annular
elements made of fibre or a similar material being inserted between
adjacent faces of the rib and of the cheeks respectively.
9 An elastic wheel according to any of the preceding claims,
characterised by the fact that the elastic ring interposed between the
tire and the rim of the wheel is divided into a plurality of annular
or segmental elements.
10 An elastic wheel according to any of the preceding claims,
characterised by the fact that the elastic ring interposed between the
tire and the rim of the wheel consists of a band wound in a helical
manner.
11 An elastic wheel according to Claim 9 or 10 characterised by the
fact that the annular or segmental elements of the elastic ring are so
arranged with respect to one another as to compensate for small
differences in their manufacture in order to obtain perfect centreing
of the tire with respect to the central portion of the -wheel.
12 Elastic wheels, substantially as described with reference to the
various Figs of the accompanying drawings. Dated this 29th day of
March, 1933. ABEL and IMRAY, 30, Southampton Buildings, London, W.O 2,
Agents
for
the Applicant. Redhill: Printed for His Majesty's
Stationery Office, by Love and Malcomson, Ltd -1934. s O 403,553
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