CN111406162A

CN111406162A - Elastic bush device for traction device and railway vehicle bogie

Info

Publication number: CN111406162A
Application number: CN201880078355.9A
Authority: CN
Inventors: 鸿池史一; 松下阳亮; 田村佳广; 佐野行拓; 町田寿史
Original assignee: Kawasaki Jukogyo KK
Current assignee: Kawasaki Motors Ltd
Priority date: 2018-01-12
Filing date: 2018-12-14
Publication date: 2020-07-10
Also published as: SG11202006564YA; JP7065618B2; WO2019138777A1; TW201932338A; JP2019124243A; US20200385032A1

Abstract

An elastic bush device of a traction device is provided with: an outer cylinder supported by the bogie; an inner cylinder into which the center pin is fitted, which is disposed radially inside the outer cylinder with a distance therebetween, and which is disposed offset upward with respect to the outer cylinder; and an elastic body sandwiched between the inner cylinder and the outer cylinder. The outer circumferential surface of the inner tube facing the elastic body is inclined downward, the inner circumferential surface of the outer tube facing the elastic body is inclined upward, and the elastic body has a shape in which the inner tube side surface is offset upward with respect to the outer tube side surface.

Description

Elastic bush device for traction device and railway vehicle bogie

Technical Field

The present invention relates to an elastic bush device used in a traction device for connecting a kingpin to a bogie in a railway vehicle, and a railway vehicle bogie.

Background

A railway vehicle is provided with a traction device for transmitting a force in the front-rear direction such as a driving force between a vehicle body and a bogie (see, for example, patent document 1). In this traction device, a center pin provided under a floor of a vehicle body is fitted into a rubber bush device fitted into a cylindrical center pin receiving portion of a bogie frame, and the vehicle body and the bogie are coupled.

Prior art documents:

patent documents:

patent document 1: japanese patent No. 5945137.

Disclosure of Invention

The problems to be solved by the invention are as follows:

in the rubber bushing device, a laminated rubber body is interposed between an inner cylinder and an outer cylinder. In the rubber bushing device described above, when the center pin is displaced to one side in the horizontal direction with respect to the center pin receiving portion and the laminated rubber body is compressed to the one side, it is preferable that the other side of the laminated rubber body also has a compression residue. That is, it is preferable that the laminated rubber body is accommodated between the inner cylinder and the outer cylinder in a state of being pre-compressed. However, the rubber bush device in which the laminated rubber body is pre-compressed and accommodated between the inner cylinder and the outer cylinder tends to increase the device cost for the reason of its manufacture.

Therefore, an object of the present invention is to reduce the cost of an elastic bush device of a traction device for a railway vehicle.

The technical means for solving the problems are as follows:

an elastic bush device of a traction device according to an aspect of the present invention is an elastic bush device used in a traction device for connecting a center pin and a bogie in a railway vehicle, and includes: an outer tube supported by the bogie; an inner cylinder in which the center pin is fitted, which is disposed radially inside the outer cylinder with a distance therebetween, and which is disposed offset upward with respect to the outer cylinder; and an elastic body sandwiched between the inner cylinder and the outer cylinder; an outer circumferential surface of the inner cylinder facing the elastic body is inclined downward, and an inner circumferential surface of the outer cylinder facing the elastic body is inclined upward; the elastic body has a shape in which the inner-tube-side surface is offset upward with respect to the outer-tube-side surface.

According to the above configuration, when a vehicle assembling operation of fitting the center pin into the inner tube of the elastic bush from above is performed, the elastic body is compressed between the outer circumferential surface of the inner tube and the inner circumferential surface of the outer tube as the inner tube is lowered with the lowering of the center pin and is intended to have the same height as the outer tube. That is, the elastic body of the elastic bush can be pre-compressed only by the assembly work, and there is no need to use an expensive elastic bush having a structure in which the elastic bush is pre-compressed before the assembly of the vehicle, and the cost can be reduced.

The invention has the following effects:

according to the present invention, the cost of the elastic bush device of the traction device of the railway vehicle can be reduced.

Drawings

Fig. 1 is a side view of a railway vehicle bogie according to an embodiment as viewed in a vehicle width direction;

FIG. 2 is a top plan view from above of the truck shown in FIG. 1;

FIG. 3 is a perspective view of the center pin shown in FIG. 1;

FIG. 4 is a perspective view of the elastomeric bushing device shown in FIG. 2;

FIG. 5 is a top plan view of the elastomeric bushing device shown in FIG. 4;

FIG. 6 is a cross-sectional view of the elastomeric bushing device and its vicinity prior to assembly of the vehicle;

fig. 7 is a sectional view of the elastic bush device and its vicinity after the vehicle is assembled.

Detailed Description

Hereinafter, embodiments will be described with reference to the drawings. In the following description, the direction in which the railway vehicle travels, i.e., the direction in which the vehicle body extends, is defined as the vehicle longitudinal direction, and the lateral direction orthogonal thereto is defined as the vehicle width direction. The vehicle longitudinal direction may also be referred to as the front-rear direction, and the vehicle width direction may also be referred to as the left-right direction.

Fig. 1 is a side view of a bogie 1 of a railway vehicle according to an embodiment, as viewed in a vehicle width direction. Fig. 2 is a plan view of the bogie 1 shown in fig. 1 as viewed from above. As shown in fig. 1, a bogie 1 supports a vehicle body 2 of a railway vehicle from below. The bogie 1 includes a bogie frame 4 that supports the vehicle body 2 by an air spring (not shown). As shown in fig. 2, the bogie frame 4 includes a cross member 4a extending in the vehicle width direction and a pair of side members 4b connected to both ends of the cross member 4a in the vehicle width direction and extending in the vehicle longitudinal direction. On both sides of the bogie frame 4 in the vehicle longitudinal direction, a pair of wheel axles 5 are disposed apart from each other in the vehicle longitudinal direction. The wheel shaft 5 has an axle 5a extending in the vehicle width direction and a pair of wheels 5b provided on the axle 5 a.

As shown in fig. 1, a bearing 6 that rotatably supports the axle 5a is accommodated in an axle case 7. A spring 8 (e.g., a coil spring) is interposed between the axle case 7 and the side member 4b to be suspended at a time. The axle boxes 7 are elastically connected to the bogie frame 4 by connection mechanisms 9. The connecting mechanism 9 includes a beam 10, a socket 11, an elastic tube 12, a mandrel 13, and a cover 14. The coupling mechanism 9 constitutes a so-called axle-beam-type axle-box supporting device. The axle beam 10 is integrally formed on the axle box 7, and projects from the axle box 7 toward the truck center side in the vehicle longitudinal direction.

The bearing block 11 is provided to the bogie frame 4 so as to protrude toward the axle beam 10. The elastic tube 12 is accommodated in a tube portion (not shown) that is open toward both sides in the vehicle width direction, which is a tip end portion of the axle beam 10. The elastic tube 12 is cylindrical and disposed with its axis directed in the vehicle width direction. A radially inner side of the elastic tube 12 accommodates a mandrel 13. The core 13 protrudes to both sides in the vehicle width direction than the elastic tube 12. Both ends of the mandrel 13 are fitted into the groove 11a of the socket 11, and are supported by the lid 14 connected to the socket 11 so as to close the groove 11 a.

As shown in fig. 2, the main motor 15 is mounted on the cross member 4 a. A speed reducer 16 is connected to the axle 5 a. The rotational power of the main motor 15 is transmitted to the axle 5a via the speed reducer 16, and the wheel 5b is rotationally driven. A center pin receiving portion 17 having a cylindrical inner peripheral surface is provided at the center of the cross beam 4 a. A substantially cylindrical elastic bush device 18 is inserted into the center pin receiving portion 17. A center pin 19 fixed to the underframe of the vehicle body 2 and projecting downward from below the floor is inserted into the elastic bush device 18. That is, the center pin receiver 17, the elastic bush device 18, and the center pin 19 function as a traction device 20 that transmits the traction force of the bogie 1 to the vehicle body 2.

Fig. 3 is a perspective view of the center pin 19 shown in fig. 1. As shown in fig. 3, the center pin 19 includes a shaft portion 21 and a flange portion 22 projecting from an upper end of the shaft portion 21 in a direction perpendicular to the shaft. A bolt hole 21a is formed in the lower end surface of the shaft portion 21. On the outer peripheral surface of the shaft portion 21, a key extending in the axial direction thereof is provided to protrude as an engaged portion 21 b. The flange portion 22 is formed with a bolt hole 22a for fixing to the underframe of the vehicle body 2. For example, the shaft portion 21 may be formed using a pipe material, and the flange portion 22 may be formed by bending a steel plate, or may be a cast or forged product. The center pin 19 is formed by manufacturing the shaft portion 21 and the flange portion 22 separately and then welding them to each other. Therefore, the shaft portions 21 having different lengths may be prepared for different vehicle types, so that the flange portion 22 can be shared between different vehicle types, and the number of components can be reduced.

Fig. 4 is a perspective view of the elastomeric bushing device 18 shown in fig. 2. Fig. 5 is a top view of the elastomeric bushing device 18 shown in fig. 4. As shown in fig. 4 and 5, the elastic bush device 18 includes: an outer cylinder 31 supported by the center pin receiver 17 (see fig. 2) of the bogie 1; an inner cylinder 32 disposed radially inward of the outer cylinder 31 with a distance therebetween, into which the center pin 19 (see fig. 3) is fitted; and an elastic member 33 interposed between the outer cylinder 31 and the inner cylinder 32. The inner cylinder 32 is disposed offset upward relative to the outer cylinder 31 (see fig. 6). The elastic body 33 has a shape in which the surface on the inner cylinder 32 side is offset upward with respect to the surface on the outer cylinder 31 side. The elastic body 33 has a shape that is directed upward as it approaches the inner tube 32 from the outer tube 31.

Specifically, the elastic body 33 includes a pair of laminated rubber bodies 40. In addition, as the elastic material, a material other than rubber may be used. The laminated rubber body 40 has three layers of arc rubbers 41 to 43 laminated in a concentric shape, and two

arc plates

44 and 45 interposed between the arc rubbers 41 to 43. The number of the arc rubber and the arc plate is not limited to this, and may be changed according to the space. The three layers of arc rubbers 41 to 43 are arranged in a step shape so as to be offset upward from the outer cylinder 31 side toward the inner cylinder 32 side. In a no-load state where the outer cylinder 31 and the inner cylinder 32 are arranged concentrically with each other, pre-compression is not applied to the arc rubbers 41 to 43.

The pair of laminated rubber bodies 40 are disposed on both sides of the inner tube 32 in the vehicle longitudinal direction. A gap S is formed on both sides of the inner tube 32 in the vehicle width direction in the space between the outer tube 31 and the inner tube 32. Thereby, the elastic bush device 18 has a high elastic coefficient in the vehicle longitudinal direction and a low elastic coefficient in the vehicle width direction. Here, when the displacement in the vehicle width direction becomes large, the distance between the

arc plates

44 and 45 and the inner tube 32 and the outer tube 31 becomes narrow, the arc rubbers 41 to 43 are compressed, and the elastic coefficient in the vehicle width direction becomes high. When the displacement is further increased, the inner cylinder 32 comes into contact with the outer cylinder 31 to exert the stopper effect. As described above, the elastic bush device 18 can transmit not only the force in the vehicle longitudinal direction but also the force in the vehicle width direction, and therefore can function as a conventional lateral movement stopper provided in a bogie. The arrangement form of the laminated rubber body 40 is not limited to this, and other forms (for example, a structure in which a cylindrical rubber is hollowed out) may be employed as long as the arrangement density of the rubber at the positions on both sides of the inner tube 32 in the vehicle width direction is lower than that at the positions on both sides of the inner tube 32 in the vehicle longitudinal direction.

The inner cylinder 32 has an engaging portion 32a that engages with the center pin 19 so as to be relatively non-rotatable with respect to the center pin 19. Specifically, a key groove extending in the vertical direction is formed as an engaging portion 32a on the inner peripheral surface of the inner tube 32, and is engaged with a key as an engaged portion 21b of the shaft portion 21 of the center pin 19. As described above, since the center pin 19 does not rotate relative to the inner cylinder 32, there is no sliding portion, and the maintenance is excellent. In the present embodiment, although one key groove is provided, a plurality of key grooves may be provided, and the number is not limited to the key groove, and any mechanism such as a spline (spline) that can not rotate relative to the key groove is not limited to the above.

Fig. 6 is a sectional view of the elastic bush device 18 and its vicinity before the vehicle is assembled. As shown in fig. 6, the center pin receiver 17 is formed with a projection 17a projecting from its inner peripheral surface toward the center. The projecting portion 17a is formed continuously with the inner peripheral surface of the center pin receiving portion 17 by machining the inner peripheral surface. The elastic bush device 18 is fitted into the center pin receiver 17 from above. A support circumferential surface 17b located above the protruding portion 17a in the inner circumferential surface of the center pin receiving portion 17 supports the outer circumferential surface of the outer cylinder 31 in the horizontal direction.

A support bottom surface 17c as an upper surface of the projecting portion 17a of the center pin receiving portion 17 supports the lower end of the outer cylinder 31 from below. The outer cylinder 31 of the elastic bush device 18 is directly fitted into the center pin receiver 17 and contacts the inner peripheral surface of the center pin receiver 17. As described above, since the outer tube 31 of the elastic bush device 18 is directly fitted into the center pin receiver 17, it is not necessary to provide a structure in which a support sleeve that supports the outer tube 31 is welded and fixed to the inner peripheral surface of the center pin receiver 17, and the number of manufacturing processes of the bogie can be reduced.

The inner circumferential surface 31a of the outer cylinder 31 facing the laminated rubber body 40 is inclined upward, and the outer circumferential surface 32a of the inner cylinder 32 facing the laminated rubber body 40 is inclined downward. That is, the inner circumferential surface 31a and the outer circumferential surface 32a facing each other are formed in a tapered shape whose diameter increases as they move upward. The inner peripheral surface 31a and the outer peripheral surface 32a are substantially parallel to each other in a vertical cross-sectional view. The inclined inner and outer

peripheral surfaces

31a and 32a sandwich the stepped arc rubbers 41 to 43 in an inclined direction with respect to the horizontal direction.

Fig. 7 is a sectional view of the elastic bush device 18 and its vicinity after the vehicle is assembled. As shown in fig. 7, when the vehicle is assembled, the shaft portion 21 of the center pin 19 is fitted into the inner space of the inner tube 32 of the elastic bush device 18 from above. In this way, the upper end surface of the inner tube 32 of the elastic bush device 18 is pushed downward by the center pin 19 and descends, and the arc rubbers 41 to 43 are compressed by the inner circumferential surface 31a of the outer tube 31 and the outer circumferential surface 32a of the inner tube 32, so that the inner tube 32 is at substantially the same height as the outer tube 31. After the vehicle is assembled, the arc rubbers 41 to 43 are pre-compressed between the outer cylinder 31 and the inner cylinder 32.

Finally, the lower end surface of the shaft portion 21 of the center pin 19 protruding downward from the center pin receiving portion 17 is fixed to the abnormal-rise prevention plate 46 by the bolt B. The abnormal rise prevention plate 46 has a diameter larger than the minimum inner diameter of the center pin receiving portion 17 (the inner diameter of the protruding portion 17 a). In the present embodiment, the abnormal-rise prevention plate 46 is circular, but the shape is not limited thereto. The abnormal-rise prevention plate 46 may have any other shape such as a rectangular shape as long as it protrudes in the radial direction at any position on the circumference of the hole of the center pin receiver 17.

According to the above-described configuration, when the vehicle assembly work for fitting the center pin 19 into the inner tube 32 of the elastic bush device 18 from above is performed, the elastic body 33 is compressed between the outer peripheral surface 32a of the inner tube 32 and the inner peripheral surface 31a of the outer tube 31 as the inner tube 32 is lowered with the lowering of the center pin 19 and tries to have the same height as the outer tube 31. That is, the elastic body 33 of the elastic bush device 18 can be precompressed only by the assembly work, and there is no need to use an expensive elastic bush having a structure in which the elastic bush is precompressed before the vehicle is assembled, and the cost can be reduced. Further, since the elastic bush device 18 can transmit the force in the vehicle longitudinal direction and the vehicle width direction and has functions of the traction link and the right and left movement stopper of the conventional bogie, these members can be omitted, and the cost can be reduced.

Further, since the inner tube 32 of the elastic bush device 18 is engaged with the center pin 19 so as to be relatively non-rotatable with respect to the center pin 19, the center pin 19 and the inner tube 32 rotate integrally at the time of vehicle rotation or the like, and the relative rotation between the inner tube 32 and the outer tube 31 can be absorbed by the elasticity in the shearing direction of the elastic body 33. Therefore, it is not necessary to interpose a sliding member or the like between the center pin 19 and the inner cylinder 32, and the structure of the traction device 20 can be simplified, thereby reducing the cost.

In the above embodiment, the non-bolster truck is exemplified, but the traction device 20 may be used not for the non-bolster truck but for the bolster truck. At this time, the center pin may be configured to protrude downward from the bolster.

Description of the symbols:

1: steering frame

4: bogie frame

17: center pin receiving part

17 b: support peripheral surface

17 c: support the bottom surface

18: elastic bushing device

19: center pin

20: traction device

31: outer cylinder

31 a: inner peripheral surface

32: inner cylinder

32 a: peripheral surface

33: an elastomer.

Claims

1. An elastic bush device for a traction device, which is used in a traction device for connecting a center pin and a bogie in a railway vehicle, comprising:

an outer tube supported by the bogie;

an inner cylinder in which the center pin is fitted, which is disposed radially inside the outer cylinder with a distance therebetween, and which is disposed offset upward with respect to the outer cylinder; and

an elastic body sandwiched between the inner cylinder and the outer cylinder;

an outer circumferential surface of the inner cylinder facing the elastic body is inclined downward, and an inner circumferential surface of the outer cylinder facing the elastic body is inclined upward;

the elastic body has a shape in which the inner-tube-side surface is offset upward with respect to the outer-tube-side surface.

2. The resilient bushing arrangement of a traction device according to claim 1,

the inner cylinder has an engaging portion that engages with the center pin so as to be relatively non-rotatable with respect to the center pin.

3. A railway vehicle bogie is provided with:

-an elastic bushing device of the traction device according to claim 1 or 2; and

a bogie frame having a center pin receiving part formed with an inner peripheral surface supporting the elastic bush device;

the outer cylinder of the elastic bush device is directly embedded into the center pin bearing part;

a protrusion protruding from the inner peripheral surface toward the center is formed continuously with the inner peripheral surface of the center pin receiver;

a support circumferential surface located above the protruding portion in the inner circumferential surface of the center pin receiving portion supports an outer circumferential surface of the outer cylinder in a horizontal direction, and a support bottom surface as an upper surface of the protruding portion supports a lower end of the outer cylinder from below.