JPH0624336A - Axle spring device for rolling stock - Google Patents

Abstract

PURPOSE:To prevent the clogging of a throttle passage, to realize a sufficiently low spring constant, to reduce the size of a device, and to facilitate the mounting. CONSTITUTION:An axle spring device to intercouple an axle box for supporting the wheel set of a rolling stock and a bogie frame positioned above the axle box is provided. A resilient body 8 to intercouple an axle body and an outer cylinder is disposed between an axle body 6 being a member on the axle box side or a member on the bogie frame side and an outer cylinder 7 being a member on the other side. A plurality of liquid chambers 9 are arranged in positions, peripherally separated away from each other, between the axle body 6 and the outer cylinder 7 and the liquid chambers 9 are intercommunicated through a throttle passage 10 formed in the axle body 6. A spring constant varying means 12 to change fluid resistance of liquid 11 with which the liquid chamber 9 and a throttle passage 10 are filled is located in the throttle passage 10.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a railway vehicle axle spring device that functions to connect an axle box for bearing a wheel axle of a railway vehicle to a bogie frame. It not only provides a high spring constant as required, but also a sufficiently low spring constant.

[0002]

2. Description of the Related Art As a conventional axle spring device for a railroad vehicle for the purpose of improving the riding comfort of the vehicle and improving the running stability of the vehicle, for example, the applicant has previously disclosed Japanese Patent Laid-Open No. 4-5007.
No. 4 has been proposed, in which a rubber elastic body 23, for example, is provided between the inner and outer cylinders 21 and 22 made of a rigid material, as shown in the transverse sectional view in FIG. , A plurality of liquid chambers 24 that are spaced apart from each other in the circumferential direction, and a throttle passage 25 that brings the liquid chambers 24 into communication with each other.
Is provided on the outer side of the outer cylinder 22, liquid is sealed in each of the throttle passage 25 and the liquid chamber 24, and
25, a spring constant changing means, for example, an electromagnetic valve 26 is provided.

[0003]

However, in such a conventional technique, since the throttle passage 25 and the solenoid valve 26 are both arranged outside the outer cylinder 22, the size of the entire device is increased. In addition, there is a problem that the attachment structure of the outer cylinder to the axle box or the bogie frame becomes complicated. Moreover, in this conventional technique, the length of the throttle passage 25 is inevitably long, and the flow resistance of the liquid is increased. Since it becomes large, there is a high possibility that the throttle passage will be clogged in relation to the vibration frequency, and there is a problem that the spring device cannot be sufficiently softened when a soft spring characteristic is required.

The present invention has been made as a result of studying to solve all the problems of the prior art, and the object of the present invention is to make the entire apparatus sufficiently small and to have an extremely simple mounting structure. Further, the present invention provides a shaft spring device for a railway vehicle, which can sufficiently eliminate the risk of clogging of the throttle passage and reduce the spring constant as expected.

[0005]

A railroad vehicle spring spring device according to the present invention, in particular, is provided between a shaft body as a shaft box side member or a bogie frame side member and an outer cylinder as the other side member.
An elastic body mainly composed of rubber, a rubber-like elastic material, etc. is arranged to integrate them, and between the shaft body and the outer cylinder,
A plurality of liquid chambers are provided at circumferentially separated positions, and
When these respective liquid chambers are made to communicate with each other by a throttle passage provided in the shaft, a spring constant changing means for changing the flow resistance of the liquid chamber and the liquid enclosed in the throttle passage is provided in the throttle passage. It is provided.

Preferably, the spring constant changing means is composed of a valve member connected to an actuator that performs translational movement or rotational movement. Further, preferably, the enclosed liquid is an electrorheological fluid, and the spring constant changing means is constituted by respective electrodes arranged on opposite side walls of the throttle passage and connected to the voltage applying means.

[0007]

In such a railway vehicle shaft spring device, by forming a throttle passage in the shaft body, it is possible to shorten the overall length of the throttle passage itself and sufficiently reduce the flow resistance of the enclosed fluid. It is possible to almost completely eliminate the risk of clogging of the throttle passage during transmission of vibration, and by minimizing the flow resistance exerted on the enclosed fluid under the action of the spring constant changing means provided in the throttle passage. The spring constant of the device can be made sufficiently small.

In this case, it is preferable that the diameter of the throttle passage formed in the shaft body is sufficiently large, and this does not affect the structure of the apparatus or the like. On the other hand, the increase of the spring constant of the device is brought about by activating the spring constant changing means to increase the flow resistance of the enclosed fluid, and by completely blocking the flow of the enclosed fluid, the increase of the spring constant is achieved. Can be particularly noticeable.

Moreover, in this device, since the respective liquid chambers are communicated with each other by the throttle passage provided in the shaft body, the diameter of the passage is smaller than that of the prior art in which the throttle passage is provided outside the outer cylinder. The entire device can be downsized regardless of size, and the mounting structure of the device outer cylinder to the axle box or the bogie frame can be made extremely simple.

[0010]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below based on illustrated examples. FIG. 1 is a side view of an essential part showing an application example of the device according to the present invention, in which 1 is a bogie frame, 2 is a wheel axle, and 3 is a shaft box for bearing the wheel axle 2 at its shaft end portion. Indicates.

Reference numeral 4 denotes a shaft spring device according to the present invention, which connects the shaft box 3 and the bogie frame 1 located above the shaft box 3, and the shaft spring device 4 extends in the front-rear direction of the shaft box 3. Each protruding arm 5 is connected to the bogie frame 1 to
It functions to elastically regulate the relative displacement of the wheel axle 2 with respect to the wheel axle 3, and to bear the weight of the bogie frame 1, the vehicle body and the like on the wheel axle 3.

For this reason, here, for example, as shown in the cross-sectional views and cross-sectional portions in FIGS. 2 and 3, for example, the rigid shaft body 6 as the bogie frame side member and the rigid outer body as the axle box side member are used. The cylinder 7 and the cylinder 7 are interconnected with each other by an elastic body 8 disposed therebetween, and a diametrical opposing direction is provided between the cylinder 7 and the cylinder 7, which are spaced apart in the circumferential direction, for example, facing the front-rear direction of the vehicle when the device is applied. At the position, two liquid chambers 9 surrounded by the shaft body 6, the outer cylinder 7, and the elastic body 8 are respectively partitioned, and both of these liquid chambers 9 are provided in the throttle passage 10 provided in the shaft body 6.
And a liquid 11 which can be ethylene glycol or the like is filled and sealed in each of the liquid chamber 9 and the throttle passage 10, and the throttle passage 10 is an example of spring constant changing means. Valve member as
By disposing 12 the shaft spring device for a railway vehicle is configured. The valve member 12 is connected to an actuator 13 attached to the lower end of the shaft body 6 in the figure, and is rotated to an appropriate position as required.

Here, the elastic body 8 of this example is divided into two parts facing in the front-rear direction of the vehicle, as is clear from the view shown in FIG. By partitioning each of the two hollow spaces 14 directed in the left-right direction of the vehicle, in particular, it functions to sufficiently reduce the spring constant of the vehicle in the left-right direction, and a plurality of sheets extending in the axial direction in the elastic body. By embedding the rigid plates 15 at intervals in the radial direction, it functions to appropriately increase the spring constant with respect to the external force in the front-rear and left-right directions of the vehicle and the external force in the axial direction.

By the way, in the elastic body 8, as shown in FIG. 2, by gradually increasing the height from the outer cylinder 7 toward the shaft body 6, the elastic body 8 is bonded to the rigid plate 15. The areas can be made substantially equal to each other inside and outside in the radial direction, so that the strain generated in each part of the elastic body 8 can be made sufficiently uniform and the durability of the elastic body 8 can be enhanced.

The arrangement of the valve member 12 in the throttle passage 10 is such that the valve member 12 connected to an actuator 13 which can be a motor and having a substantially spherical shape is connected to a Teflon or other friction coefficient. The sliding contact member 16 is sandwiched and supported by a small sliding contact member 16, and the sliding contact member 16 is housed in a cylindrical rigid casing 17. Further, the rigid casing 17 is mounted together with a top plate 18 and a bottom plate 19 on the shaft body 6. This is done by tightly fitting and fixing it in a recess 20 provided at the lower end.
In this case, the throttle passage 10 extends from the shaft body 6 through the top plate 18, the rigid casing 17 and the sliding contact member 16 to the valve member 12 and extends symmetrically with respect to the shaft body center line.

According to such a throttle passage structure including the valve member 12, when the valve member 12 is in a completely opened state as shown in the drawing, when a horizontal external force in the front-rear direction of the vehicle acts, the respective liquid chambers are closed. The liquid can flow extremely smoothly, and therefore, the risk of clogging of the throttle passage can be sufficiently removed, and at the same time, the spring constant can be made sufficiently small. On the other hand, by the operation of the actuator 13,
When the opening degree of the valve member 12 is reduced, the throttle passage area gradually decreases and the flow resistance of the liquid increases with the decrease, so that the spring constant also gradually increases.
The spring constant is highest when the valve member 13 is fully closed.

The valve member 12 can also function as an open / close valve at two positions, a fully closed position and a fully open position. In this case, the spring constant in the front-back direction of the vehicle is high and low. The spring constant is increased by fully closing the valve member 12 when the vehicle starts and stops, and when the vehicle is turning, the valve member 12 is changed in two steps.
Can be fully opened to reduce the spring constant. According to this, when the vehicle starts and stops, it is possible to enhance the running stability of the vehicle and the riding comfort of the vehicle. It becomes possible to reduce effectively.

FIG. 4 is a schematic cross-sectional view showing another example of the valve member. This is to form two kinds of through holes 12a, 12b of large diameter and small diameter in the spherical valve member 12, respectively. Depending on the type, three types of spring constants can be selected. That is, when the vehicle starts and stops, the valve member 12
By completely closing the valve to prevent the flow of liquid,
The spring constant can be maximized, and when the vehicle travels straight ahead, the small diameter through hole 12b of the valve member 12 can be aligned with the throttle passage 10 to provide a medium spring constant. Large diameter through hole 12a
The lowest spring constant can be provided by aligning the with the throttle passage 10.

The shaft spring device configured as described above is
For example, by attaching the attachment member 6a fixed to the shaft body 6 to the bogie frame 1 and the outer cylinder 7 to the arm 5 of the axle box 3, and, if necessary, the arm 5 and
It can be used by disposing a coil spring between the mounting member 6a or the bogie frame 1.

In the embodiment described above, the valve member 12 is a cylindrical member rotated by the actuator 13, or reciprocates in the axial direction of the shaft body 6 or in the direction orthogonal thereto. A spool valve can also be used, and this can also bring about the same effects as those described above.

Although not shown, according to the present invention,
The sealed liquid in the liquid chamber is an electrorheological fluid, and the spring constant changing means is arranged on the opposite side wall of the throttle passage,
It is also possible to use an electrode connected to the voltage applying means, whereby a voltage applied to the electrode, and thus to the electrorheological fluid, is changed to change the viscosity of the electrorheological fluid itself, whereby the axial spring is changed. The spring constant of the device can be adjusted steplessly.

[0022]

As is apparent from the above description, according to the present invention, since the throttle passage is formed in the shaft body, the entire length thereof can be sufficiently shortened, so that the throttle passage becomes the enclosed fluid. The inherent flow resistance exerted can be made sufficiently small, so that the risk of clogging of the throttle passage is effectively eliminated and the minimum spring constant of the device can also be made sufficiently small. In addition, both the throttle passage and the spring constant changing means,
By arranging the outer cylinder on the inner peripheral side, the entire apparatus can be downsized sufficiently and the outer cylinder of the apparatus can be attached extremely easily.

[Brief description of drawings]

FIG. 1 is a side view of an essential part showing an application example of an invention device.

FIG. 2 is a vertical sectional view showing an embodiment of the present invention.

3 is a cross-sectional view of FIG.

FIG. 4 is a cross-sectional view showing another example of the valve member.

FIG. 5 is a cross-sectional view showing a conventional example.

[Explanation of symbols]

 1 bogie frame 2 wheel shaft 3 shaft box 4 shaft spring device 5 arm 6 shaft body 7 outer cylinder 8 elastic body 9 liquid chamber 10 throttle passage 11 liquid 12 valve member 12a large diameter through hole 12b small diameter through hole 13 actuator 14 hollow space 15 rigidity Plate 16 Sliding contact member 17 Rigid casing 18 Top plate 19 Bottom plate 20 Cavity

Claims (3)

[Claims] 1. An axle spring device for a railway vehicle for interconnecting an axle box supporting a wheel axle of a railway vehicle and a bogie frame located above the axle box, the axle box side member or bogie frame side member An elastic body is arranged between the shaft body as a member and an outer cylinder as a member on the other side, and a plurality of liquid chambers are provided at positions circumferentially separated between the shaft body and the outer cylinder. , The respective liquid chambers are communicated with each other by a throttle passage provided in the shaft body,
A shaft spring device for a railway vehicle, comprising spring constant changing means for changing the flow resistance of a liquid chamber and a liquid sealed in the throttle passage in the throttle passage. 2. A shaft spring device for a railway vehicle according to claim 1, wherein the spring constant changing means is a valve member connected to an actuator. 3. The liquid according to claim 1, wherein the liquid is an electrorheological fluid, and the spring constant changing means is each electrode connected to a voltage applying means and arranged on opposite side walls of the throttle passage. Axle spring device for railway vehicles.