FR2477489A1 - DEVICE FOR SUSPENSION AND CONNECTION BETWEEN A BOGIE CHASSIS AND AN AXLE BOX - Google Patents

Abstract

SUSPENSION DEVICE AND CONNECTION BETWEEN A BOGIE FRAME AND AN AXLE BOX. THE PRESENT INVENTION RELATES TO A SUSPENSION AND LINKAGE DEVICE BETWEEN A BOGIE CHASSIS AND A RAIL BOGIE AXLE. THE DEVICE ACCORDING TO THE INVENTION INCLUDES AT LEAST ONE HELICOIDAL METAL SPRING FOR VERTICAL SUSPENSION BY WHICH THE BOGIE FRAME IS BASED ON THE AXLE BOX AND ON THE OTHER HAND OF ELASTIC LINKS EACH INCLUDING AT LEAST ONE PLOT - IN ELOMAST MATERIAL BETWEEN THE SUPPORT FACES OF THE SAID CHASSIS AND THE SAID AXLE BOX AND IT IS ESSENTIALLY CHARACTERIZED BY THE FACT THAT THE ELASTIC LINKS 51-52 AND 61-62 ARE MOUNTED SPACED ALTITUDE AND SO THAT THEIR SUPPORTS 351 -352 AND 361-362 ON AXLE BOX 3 ARE OPPOSED AND THAT THE SUPPORT FACE 351-352, ON THE SAID BOX, OF THE HIGHEST ELASTIC LINK 51-52 IS IN FRONT OF THE LOAD F TRANSMITTED BY THE SPRING 4.

Description

Z47? 469

  The present invention relates to a suspension and

  link between the bogie frame and each axle box equipping a

  sieu of a rolling train of a railway motor truck or carrier.

  In a bogie suspension, provision must be made for vertical elasticity between the bogie frame and each axle boot. It is also necessary that each axle boot is guided relative to the chassis,

  longitudinally and transversely.

  Various types of bogie are known in which studs in

  are mounted between the bogie frame and each axle box.

  In certain bogies such as that described in French Patent No. 1,273,182, the suspension and the connection between the chassis and each boot

  of axles are made only by means of studs -in elastomer-

framing this axle boot.

  Each elastic stud is housed between two parallel bearing faces and slightly inclined relative to the vertical. The studs are arranged, two by two, in dihedrons such that the bisecting planes are vertical, this dihedral arrangement to support a vertical load

  in combined stress of compression and shear. The rigidity

  the vertical direction is not negligible. -

  On other bogies, spiral springs intended to ensure the suspension

  vertical pension are associated with pads - elastomer- ensuring the elastic connections. On certain bogies, each elastomer stud is

  housed between two parallel bearing faces and slightly inclined by

  port vertically. These elastic studs are arranged, two by two, in

  dihedra whose bisecting planes are vertical so that the

  Vertical beams are supported in combined compressive and shear stresses. The elastomer pads are mounted in parallel with

  the vertical suspension springs. This arrangement disrupts the function

  especially at high frequencies.

  On certain bogies, the suspension and the connection between the bogie frame and the axle boot comprise a helical spring and elastic studs framing the axle boot. Each elastic stud is housed

  between two vertical support faces. The elastomeric material is

  crushed. Under the effect of creep, prestressing decreases

in time.

Z477489

  The subject of the present invention is a device for suspending

  of the bogie chassis and the longitudinal and trans-

  versale of each axle boot and chassis and capable of providing, without disturbing the vertical suspension, a certain radial and axial elasticity of the axle. This device uses studs - in elastic material

  tomere- prestressed such that prestressing evolves over time.

  As a result, the guiding characteristics are constant and independent.

  the creep of the material and the vertical dynamics of the suspension

not modified.

  The device according to the invention comprises at least one metallic spring

  vertical suspension helicoldal by which the bogie frame is supported on the axle boot-and secondly elastic links each comprising at least one stud-elastomeric material-sandwiched between

  bearing faces of said frame and said axle boot and it is es-

  characterized in that the elastic links are mounted spaced aloft and so that their bearing surfaces follow said boot

  on the axle boot are opposed and that the bearing face of the link

  its highest elastic is in front of the load transmitted by the spring. According to one characteristic of the invention, the links are arranged

  on both sides of the vertical plane passing through the axle axis.

  According to another characteristic of the invention, the elastic links

  are placed on either side of the horizontal plane passing through the

axle xe.

  The invention will now be described in more detail with reference to

  to an exemplary embodiment and represented by

the attached drawings.

  FIG. 1 is an elevational view of the suspension device and

  linkage mounted between the bogie frame and an axle boot.

  FIG. 2 represents a section along A-A of FIG.

  The bogie represented by FIGS. 1 and 2 comprises a chassis of

  2 which is suspended on a running gear comprising axles 1.

  Each axle is equipped with two axle boots.

  The vertical suspension associated with each axle boot is provided by at least one helical spring steel. Each coil spring is

  mounted vertically between the bogie frame and the axle boot. The Po-

  sitioning the spring or springs, relative to the vertical plane 8 passing through the axle axis, is such that the body of the axle boot is subjected 24Et? 489 to a force or load Fdécalée laterally relative to this plane 8, and is

  thus subject to a couple of rotation.

  In the embodiment of FIGS. 1 and 2, a single coil spring

  coidal 4 is placed at a specific distance from the vertical plane 8, on one side of the axle box. This spring is housed so as to be compressed between a horizontal upper bearing surface 21 of the frame and a bearing

  lower horizontal 31 formed on the console 32 of the axle box.

  The vertical axis 1 of the spring 4 is located laterally at a finite distance L

  from the vertical plane 8 passing through the axle axis 11.

  In the case of bogies with high axle loads, several springs

  are mounted between the axle box and the chassis. These springs are posi-

  in such a way that the result of the forces on the springs creates a torque on the body of the axle boot in the same way as in the case

  o a single spring is mounted between the bogie frame and the boot of

Sieur.

  The axle boot is linked to the bogie chassis by elastic links

  which are each preferably constituted by two elastic studs. Read-

elastic

  only links are constituted by the pads / 51-52, the other lias its elasticity

  that being constituted by the two elastic studs 61-62. The elasticity

  51-52 and the elastic connection 61-62 are mounted spaced alternately

  to balance the torque applied to the axle boot.

  The upper elastic connection formed by the elastic studs 51 and 52 is located on the side of the spring 4 relative to the vertical plane passing through the axle axis. It is located above the horizontal plane 7 passing through the axis 11 of revolution of the axle, between the load transmitted by the helicoidal spring or springs and the vertical plane 8 passing through this axis 11 or between this vertical plane and the parallel plane passing through the axis 41

  spring. The lower elastic connection constituted by the elastic studs

  61 and 62 are located, relative to the spring 4 and the] ls superior, on the other side of the vertical plane 8 passing through the axis 11. The link 51-52 and the link 61-62 are mounted from and other vertical plane 8. The link 616 / is located below the horizontal plane 7 passing through the axis of revolution 11 of the axle, beyond, relative to the spring, the vertical plane 8 passing through this axis 11. The elastic connection constituted by the elastic studs

  51 and 52 and the elastic connection constituted by the elastic studs

  lower ticks 61 and 62 are located on both sides of the vertical plane

  8 passing through the axis of revolution of the axle.

  The distance between the center of an upper elastic stud 51 or 52 and the axis of revolution of the axle is substantially equal to the distance between

  the center of a lower elastic stud 61 or 62 and this same axis of revolution.

  tion. Preferably, the upper resilient studs 51 or 52 and the studs

  elastic bands 61 or 62 must be mounted symmetrically

  port to the axis of revolution of the axle. Each elastic stud has a shape

  prismatic or cylindrical whose terminal cross sections are para; -

  and a d liéles léles / r pe tively against a bearing face of the axle boot and a bearing face of the bogie frame. Thus the pads 51 and 52 are respectively sandwiched between bearing faces 351 and 352 of the axle boot which face the vertical spring and opposite bearing faces 251 and 252 which are formed on the bogie frame. The lower pads 61 and 62 are

  enclosed respectively between bearing faces 361 and 362 of the boot of

  which are facing away from the vertical spring and faces of

  261 and 262 opposite, formed on the bogie frame. Both sides

  each elastic stud is substantially vertical.

  The bearing faces of the axle boot 352-352 and 361-362 are op-

  o1sition. The upper bearing faces 351-352 of the boot relative to the upper elastic / are oriented on the side of the load transmitted by the or the metal springs. In the case where a single spring is provided as in the embodiment shown, the faces il-352 are turned towards the spring 4. These bearing faces face the resultant efforts

  transmitted by the springs in the case where several springs are mounted

  be the bogie frame and the axle boot. Lower support faces

  361-362 are turned to the opposite side. This provision entails the compro-

  elastic studs. In all cases, the support faces on the bot-

  axle are always oriented the same way compared to the torque

  generated by the efforts on the springs.

  The pads are made of elastin material or rubber. The

  straight sections are joined to two rigid metal

  applied respectively against the axle boot and the chassis

  ogy. Each stud may consist of plates, made of elastomeric material,

  adhered to intermediate rigid metal plates.

  The bearing faces of the elastomer studs on the axle boot and the

  truck beds may be arranged in accordance with one of the

  currently known according to the performance required for the guidance of the axle boot and depending on the type of bogie. The elastic studs can be mounted so that their bearing faces, thirsty against the axle boot, are against the bogie frame, or in a

  same plan. The bearing faces of the various elastic studs can still be

  be applied along cylindrical surfaces of the axle boot or

of the bogie frame.

  The bearing faces of the elastic links may also be arranged in dihedral as shown by the embodiment of FIGS. 1 and 2. The two bearing faces 251 and 252, on the frame, of the two upper elastic studs the upper elastic link and the two opposite bearing faces 351 and 352, on the axle boot then have dihedrons having a common bisecting plane, perpendicular to the axis of revolution of the axle. Of the same two bearing faces 261 and 262, on the chassis, lower resilient lower pins and the two opposite bearing faces 361 and 362, on the axle box, form dihedrons having a common bisecting plane,

  perpendicular to the axis of revolution of the axle. In this type of

  the elastic studs 51 and 52 are mounted in chevron 1, symmetrically

  relative to the vertical plane passing through the axis 41 and perpendicular to the axis of revolution of the axle. The lower elastic studs 61 and 62

  are also mounted in "chevron, symmetrically with respect to the plan de-

finished earlier.

  The elastic studs are identical in terms of dimensions and

from the point of view of the constitution.

  The vertical suspension spring and the upper elastic studs 51 and 52 are mounted towards the outside of the bogie with respect to the vertical plane

  8 passing through the axis of revolution of the axle. The lower elastic studs

  61 and 62 are mounted towards the center of the bogie relative to this same

vertical plane 8.

  The vertical suspension spring 4 may consist of a single spring

  spell or several coaxially mounted springs.

  The operation of the device will be described below.

  The vertical suspension spring or springs exert a force F (re-

  sultante in the case of several springs) on the axle boot 3. Because the load F applies to the axle boot at a non-zero distance from the vertical plane 8 passing through the axis of revolution 11 of the axle 'axle,

  this effort F creates a torque that tends to rotate the axle box to-

  turn of this axis 11, by compressing the elastic studs 51, 52, 61, 62. These elastic studs are subjected to a compressive force P defined by the

  ratio of the lever arms and the load P supported by the vertical spring

  tical. This effort is constant independent of the creep of the elastomeric material constituting the elastic pads. The mechanical properties of the material

24? P.489

  elastomer are such that the compressive force applied

  shear stiffness of the studs - in the vertical direction - low or zero.

  The total instability of the elastic studs in the vertical direction does not disturb

  the operation of the coil spring 4. In the radial direction of the

  sieu, that is to say in the longitudinal direction materialized by the management

  7, the elastic elements provide, with some flexibility, the drive

  longitudinally of the axle. In the axial direction of the axle, that is to say

  say parallel to the axis of revolution 11, the elastic studs ensure,

  with some flexibility, the lateral or transverse guidance of the

sieu.

  Because the coil spring 4 is mounted offset from the axis of the axle, it can be placed either outside or inside the bogie. When placed at 4-'extirieur, the studs

  lower elastics are located towards the center of the bogie and the

  under lowered vehicles is facilitated.

  It is understood that one can, without departing from the scope of the invention;

  imagining variants and refinements of detail and in the same way

  to employ the use of equivalent means.

*.

Claims (7)

  1) Device for suspension and connection of a bogie frame to a bot-   axle assembly, comprising at least one helical metal spring of   vertical pension by which the frame rests on the axle boot and elas tiqiues nn hcn links / oiprenant each at least one pad of elastomeric material sandwiched between a bearing surface of said frame and a bearing surface of said   axle boot, characterized in that the elastic links are   spaced apart at altitudes and so that their faces on the bot- on the boot of the   axle positions are opposite, and that the highest support / linkage   facing the load transmitted by the springs.   2) Device according to claim 1 characterized in that the links are two in number and are   arranged on either side of the vertical plane passing through the axle axis.   3) Device according to any one of the preceding claims,   characterized in that the elastic links are two in number and are arranged on either side of the horizontal plane passing through the axle axis.   4) Device according to any one of the preceding claims   characterized by the fact that the two bearing faces of each elastic stud   respectively on the bogie frame and on the axle boot are sensi- vertically.   Device according to one of the preceding claims   characterized by the fact that the pads are substantially located at equal distances axle axis.   6) Device according to any one of the preceding claims   characterized in that the studs are mounted symmetrically with respect to to the axle axis.   7) Device according to any one of the preceding claims   characterized by the fact that the upper elastic connection is mounted between   the load transmitted by the spring and the vertical plane passing through the axis of sieu.   8) Device according to any one of the preceding claims   characterized by the fact that the bearing faces of the elastic links on the axle boot and on the bogie frame form dihedra whose planes   bisectors are perpendicular to the axle axis.