JP2002331930A - Axle box supporting device for railway rolling stock - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve a serviceable life of support rubber and a reduce an installation space. SOLUTION: This axle box supporting device for a railway rolling stock is so formed that a coil spring 29 and a support rubber 30 positioned in its inside are made to act between respective pair of upper/lower axle spring receivers 28 and 19 vertically opposed to each other in both sides of a bearing part 14 of an axle box 13 having the bearing part 14 for a wheel set and a carriage frame 27. This device is characterized in that the coil sprint 29 is set into an inverse conical shape whose upper part has a larger diameter than that of the lower part.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an axle box supporting device for a railway vehicle for supporting a wheel axle at both ends thereof.

[0002]

2. Description of the Related Art In order to make a vehicle run at high speed and stably, it is necessary to accurately follow a constantly changing track condition while keeping respective wheel sets always parallel. The axle box that contains the bearings that support this wheel axle at both ends is secured by the axle box support device to ensure that movement in the front-rear direction is suppressed and that there is room to reduce lateral pressure in the left-right direction. It is supported so as to smoothly operate the buffering action via a shaft spring in the direction.

For this reason, it is common practice to elastically support the bogie frame with respect to the shaft box by means of shaft springs provided on both sides in the front-rear direction of the bearing portion of the shaft box. Coil springs have been commonly used as shaft springs, but in order to cope with problems such as increased lateral pressure when passing high-speed curves due to speeding up and flange wear due to this, a large number of rubber bodies are laminated with steel plates interposed. An axle box support device has been developed which uses the support rubber thus formed to elastically support the axle box body in the horizontal direction while positioning the axle box body.

Recently, an axle box supporting apparatus using a coil spring 3 and a supporting rubber 8 inside thereof as shown in FIG. -149373). In this axle box support device, a set of a cylindrical coil spring 3 and a supporting rubber 8 for elastically supporting the bogie frame with respect to the axle box body 1 is provided with a bearing 1 in the axle box body 1.
a, which is disposed on both sides in the front-rear direction (the left-right direction in the figure) and is operated between the spring receiver 4 attached to the bogie frame 2 and the spring receiver 7 attached to the shaft box 1. The coil spring 3 is formed in a straight cylindrical shape, and the supporting rubber 8 is disposed in the coil spring 3 and is laminated so as to have a large volume near the lower end of the coil spring 3. Correspondingly, the support rubber 8 is operated between the lower half of the rod-shaped portion 4a provided on the spring receiver 4 side and the cylindrical portion 7a of the spring receiver 7.

[0005]

However, in the above-described axle box supporting device, the coil spring 3 is limited to a cylindrical shape and a large diameter without conforming to the shape of the rounded bearing portion 1a in the axle box body 1. The size of the support rubber is limited because it cannot be installed in a closed space.
Must be made even smaller than that, so that the durability cannot be improved. Further, since the coil spring 3 has a cylindrical shape, it has a linear characteristic spring constant as shown by a broken line in FIG. 2, and the amount of deflection is proportional to an increase in the load which is the weight loaded on the vehicle. Become larger. At this time, since the support rubber 8 is deformed relatively largely with respect to the amount of deflection of the coil spring 3, the durability is reduced.

Further, since the coil spring 3 has a linear spring constant as described above, the spring constant cannot be reduced due to the amount of bending, so that the ride comfort of the vehicle deteriorates. In addition, the amount of deflection of the coil spring 3 may be increased, which may cause restrictions on the vehicle configuration.

Therefore, the present invention has been made in view of the above-mentioned conventional problems, and it is possible to improve the durability of a supporting rubber, to achieve a reduction in the number of parts and a reduction in installation space. It is an object of the present invention to provide an axle box support device for a railway vehicle having a configuration.

[0008]

In order to achieve the above object, an axle box supporting device for a railway vehicle according to the present invention comprises: a shaft box having a bearing for a wheelset; and a bogie frame. Between each pair of upper and lower shaft spring bearings facing up and down on both sides of
An axle box support device for a railway vehicle in which a coil spring and a supporting rubber located inside the coil spring are operated, wherein the coil spring is formed in an inverted conical shape in which the upper portion has a larger diameter than the lower portion.

[0009] In this axle box support device for a railway vehicle, the coil spring has an inverted conical shape, so that it can easily fit beside the bearing portion of the axle box body, and the upper portion is made more conventional by utilizing a portion which has been a dead space. It is possible to increase the size of the bearing and to make it closer to the bearing. Can be improved in durability. Further, since the coil spring has a conical shape, the spring constant exhibits a non-linear characteristic, and when the load increases to a predetermined value, the amount of deflection saturates and the maximum amount of deflection is regulated. Therefore, since the supporting rubber that is deformed to the deformation amount corresponding to the amount of deflection of the coil spring is not greatly deformed, it is possible to reliably suppress the decrease in the durability of the supporting rubber and, in addition, to increase the loading load. In this case, since the amount of deflection of the coil spring and the deformation of the supporting rubber are small, the riding comfort of the vehicle is improved,
The safety against derailment of the vehicle is increased.

In the above invention, if the supporting rubber is laminated so as to have a large volume near the upper part of the coil spring, the supporting rubber is efficiently used by utilizing the inner space of the coil spring whose upper part is larger than the conventional one. Can be achieved.

[0011]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of the present invention will be described below with reference to the drawings. In FIG. 1, spring bearing arms 17 are formed on the shaft box 13 at both sides in the front-rear direction (left-right direction in the drawing) of the bearing portion 14, respectively, so as to protrude. Each spring receiving arm 1
7 has a mounting hole 18 that penetrates in the vertical direction. A lower shaft spring support 19 is mounted in the mounting hole 18. Specifically, the lower shaft spring support 19 includes a flat spring seat 19b at the outer peripheral portion and a rod-shaped spring seat 21 at the center separately. The flat spring seat 19b has a cylindrical portion 19a integrated with the flat spring seat 19b fitted into the mounting hole 18 from above, and a flat spring seat 19b.
An adjustment plate 20 is interposed between b and the spring receiving arm 17.

The lower end of the rod-shaped spring seat 21 is fitted into the cylindrical portion 19a of the flat spring seat 19b from above, and the spacer 22 and the abutment plate 23 contact the lower surface of the spring receiving arm portion 17.
Bolt 24 inserted from below into the rod-shaped spring seat 2
By being screwed into the female screw portion 21a at the lower part, it is fastened and fixed to the spring receiving arm 17 together with the flat spring seat 19b.

On the other hand, a pair of upper shaft spring bearings 28 are fixed to the bogie frame 27 above the shaft box body 13 so as to be opposed to the lower shaft spring bearing 19, respectively. The upper shaft spring support 28 integrally includes a flat spring support 28a on the outer periphery and a cylindrical spring seat 28b on the inner side thereof.
It is fixed with screws. Flat spring seat 28
a is formed to have a larger diameter than the flat spring seat 19a,
Between them, an inverted conical coil spring 29 whose upper part has a larger diameter than that of the lower part is operated. This allows
The bogie frame 27 is provided with the shaft box 1 by the intervention of the coil spring 29.
3 is elastically floating supported. Between the cylindrical spring seat 28b and the rod-shaped spring seat 21, a supporting rubber 30 in which a plurality of rubbers are laminated with a steel plate interposed therebetween is operated. The cylindrical spring seat 28b is fitted over the outer peripheral surface of the upper part of the support rubber 30 from above. The lower end of the support rubber 30 is supported from below by a support ring 31 fitted in the recess 19c of the flat spring seat 19b. The support rubber 30 is laminated so as to have a large volume near the upper portion where the diameter is large in the inverted conical coil spring 29.

The conical coil spring 29 is easy to conform to the side of the bearing portion 14 of the shaft box 13. For example, even if the lower end is made substantially the same diameter as the conventional one and is enlarged upward, the portion which has been a dead space in the past is reduced. The coil spring 29 is enlarged by using, that is, satisfying the conventional space saving, and the supporting rubber 3
0 can be considerably increased.

However, even if the diameter of the upper end of the coil spring 29 is larger than that of the conventional one, and the diameter of the lower end is smaller than that of the conventional one, the supporting rubber 30 whose volume is closer to the upper end can be sufficiently formed. An upper space that can be increased is obtained, and the coil spring 2 having such a size is provided.
9, the spring receiving arm portion 17 can be made shorter and the spring receiving arm portion 17 can be shortened as compared with the conventional case, so that the space can be saved more than before.

In this axle box support device for a railway vehicle, the durability of the support rubber 30 is significantly improved. That is, since the supporting rubber 30 is provided so as to have a larger volume toward the upper side of the inverted conical coil spring 29 having a larger diameter than the conventional one, the supporting rubber 30 is larger than the conventional one corresponding to the large diameter of the coil spring 29. And the durability is improved with the increase in size.

Further, since the coil spring 29 has an inverted conical shape, the spring constant becomes non-linear as shown by the characteristic curve shown by the solid line in FIG. 2, and the amount of deflection is saturated when the load increases to a predetermined value. As a result, the maximum deflection amount is regulated. Therefore, the supporting rubber 30 that is deformed according to the amount of deflection of the coil spring 29
Is not deformed to a large deformation amount, so that a decrease in the durability of the support rubber 30 can be reliably suppressed. In addition, since the amount of deflection of the coil spring 29 and the deformation of the support rubber 30 are both small even when the loaded load is large, the riding comfort of the vehicle is improved and the safety against derailment of the vehicle is increased.

Further, in the axle box support device, since the support rubber 30 is integrated with the upper part of the rod-shaped spring seat 21, the number of parts and the number of assembling steps for mounting the support rubber 30 are smaller than those of the conventional device shown in FIG. Therefore, cost can be reduced. Furthermore, the coil spring 2
The upper shaft spring bearing 28 whose diameter is increased in accordance with the upper end of the coil spring 9 can be disposed together with the coil spring 29 without hindrance by effectively utilizing the previously dead space.

[0019]

As described above, according to the axle box support device for a railway vehicle of the present invention, since the coil spring has an inverted conical shape, the coil spring is easily adapted to the side of the bearing portion of the axle box, and has conventionally been a dead space. The upper part can be made larger than before by using the part that was made, and it can be made closer to the bearing part together with it, and after satisfying space saving, it is also made larger inside space than before and this is also larger than before. The durability of the supporting rubber can be improved by the increased amount. Further, since the coil spring has a conical shape, the spring constant exhibits a non-linear characteristic, and when the load increases to a predetermined value, the amount of deflection saturates and the maximum amount of deflection is regulated.
Therefore, since the supporting rubber that is deformed to the deformation amount corresponding to the amount of deflection of the coil spring is not greatly deformed, it is possible to reliably suppress the decrease in the durability of the supporting rubber and, in addition, to increase the loading load. In this case, since the amount of deflection of the coil spring and the deformation of the supporting rubber are small, the riding comfort of the vehicle is improved and the safety against derailment of the vehicle is enhanced.

[Brief description of the drawings]

FIG. 1 is a partially cutaway side view showing an axle box support device for a railway vehicle according to an embodiment of the present invention.

FIG. 2 is a characteristic diagram showing characteristics of a spring constant of a coil spring of the axle box supporting device.

FIG. 3 is a partially cutaway side view showing a conventional rail car axle box support device.

[Explanation of symbols]

 13 Shaft Box 14 Bearing 19 Lower Shaft Spring Bearing 27 Bogie Frame 28 Upper Shaft Spring Bearing 29 Coil Spring 30 Support Rubber

Continued on front page F-term (reference) 3J059 AA03 AB11 AC01 BA05 BA55 BB09 BC01 BC06 BD01 BD07 CB02 DA18 GA50

Claims (2)

[Claims] A shaft box having a bearing for a wheel axle;
An axle box supporting device for a railway vehicle, wherein a coil spring and a supporting rubber located inside the pair of upper and lower shaft spring bearings vertically opposed on both sides of the bearing portion with respect to a bogie frame are used. An axle box support device for a railway vehicle, wherein the spring has an inverted conical shape in which the upper portion has a larger diameter than the lower portion. 2. The axle box support device for a railway vehicle according to claim 1, wherein the laminated rubber is laminated so as to have a large volume near an upper portion of the coil spring.