JPH05238389A - Journal box supporting device for rolling stock - Google Patents

Abstract

PURPOSE:To provide a journal box supporting device for a rolling stock which provides an excellent riding sensation, reduces the weight of a journal box, and provides increased lives for various constituting parts. CONSTITUTION:A shaft spring 21 for supporting a truck frame 3 is arranged in a standing-upright state right above a journal box body 10 and the support arm 22 of the journal box body 10 is arranged in a state to extend to the one side in a longitudinal direction. The tip part 22a thereof is supported on the truck frame 3 through a support rubber 23. The support rubber 23 is structured such that the journal box body 10 is vertically, laterally, and longitudinally supported on the truck frame 3. This constitution causes the decrease of rotational displacement around the axle 8 of the journal box body 10.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rail car axle box support device, and more particularly to an improvement of a support device having a structure for suppressing rotational displacement of an axle box body around an axle.

[0002]

2. Description of the Related Art An example of a conventional axle box support device is shown in FIG. This support device is generally called a shaft burr type,
The axle of the wheel b is rotatably supported by the axle box a, and the axle spring c is arranged immediately above the axle box a.
The shaft spring c receives the end of the bogie frame d from below.
On the other hand, a support arm e of the shaft box a is provided so as to extend to one side in the front-rear direction (rear in the case of the drawing), and a tip end portion of the support arm e supports the bogie frame d via a support rubber f. It is supported by a rubber receiver g. The support rubber f elastically supports the shaft box a with respect to the bogie frame d in the front-rear, left-right, and rotational directions.

[0003]

However, such an axial burr type axle box supporting device has the following problems, and its improvement has been desired. (1) The length of the support arm e of the shaft box a is preferably set as long as possible in order to reduce the inclination angle of the shaft spring seat surface h when the bogie frame d is displaced in the vertical direction. on the other hand,
This increase in the length of the support arm e causes an increase in the weight of the shaft box body a itself.

(2) Since the supporting arm e of the shaft box a is long, the bearing i of the shaft box a when a load in the left-right direction acts on the bogie frame d.
The lateral moment applied to the bearing is large, which shortens the life of the bearing i. (3) Since a large moment force acts on the shaft spring c by the long support arm e of the shaft box a, the shaft spring c
The stress generated in the shaft spring c is larger than that in the case where the shaft spring c is compressed straight in the vertical direction, and this shortens the life of the shaft spring c.

(4) Since the support arm e of the shaft box a is long, the tip of the support arm e approaches the bogie frame d, and the mounting space of the support rubber f fitted therein is limited. For this reason, the degree of freedom in selecting the shape and size of the support rubber f is very small, and it is difficult to obtain optimum support rigidity as the axle box support device. (5) Since the supporting rubber f is supported by the bogie frame d with a spring constant that is hard in the vertical direction, the vibration generated by the rotation of the wheels b when the vehicle is traveling is caused by the bogie frame through the axle box a. It is easily transmitted to d, which causes a reduction in riding comfort.

The present invention has been made in view of the above conventional problems, and it is possible to obtain a good riding comfort, and further, it is possible to reduce the weight of the axle box body and extend the life of various components. An object of the present invention is to provide an axle box support device for a railway vehicle.

[0007]

In order to achieve the above object, in the axle box supporting device of the present invention, an axle spring for supporting the bogie frame is arranged in an upright state directly above the axle box body, and The support arm of the box body is provided to extend to one side in the front-rear direction,
The tip portion thereof is supported by the bogie frame via a supporting rubber, and the supporting rubber has a structure that elastically supports the shaft box body in the up, down, left and right and front and rear directions with respect to the bogie frame,
Accordingly, the rotational displacement of the axle box body around the axle is reduced.

[0008]

With the structure in which the support rubber elastically supports the axle box body in the up-down, left-right and front-rear directions with respect to the bogie frame, rotational displacement of the axle box body around the axle can be suppressed in the following manner. ..

That is, when the bogie frame is displaced in the vertical direction, the axial box body tends to rotate downward around the tip support portion of its support arm due to the elastic force of the axial spring in the axial direction (vertical direction). On the other hand, at this time, a bending moment is also generated in the shaft spring, and this bending moment works so as to rotate the tip end side of the support arm of the shaft box downward, so that the rotational force in the direction opposite to that of the shaft spring is applied. Will act on.

As a result of the elastic action of the support rubber, the downward rotation of the tip end side of the support arm is allowed to some extent, so that the rotational displacement of the shaft box body from the normal state is offset. This prevents a reduction in riding comfort due to the rotational displacement of the shaft box body, and also reduces the moment force acting on the shaft spring.

Further, as a result of reducing the rotational displacement of the shaft box body, the length of the support arm of the shaft box body can be shortened as compared with the conventional shaft burr type, and the moment of the shaft box body with respect to the bearing is reduced. Is reduced and a large installation space for the support rubber is secured. Furthermore, the support rubber ensures elasticity in all directions and insulates vibration from the shaft box body.

[0012]

Embodiments of the present invention will be described below with reference to the drawings. 1 and 2 show a bogie portion of a railway vehicle provided with an axle box supporting device according to the present invention.
A bogie frame 3 for supporting the wheels, wheels 4, 4, ...

The bogie frame 3 includes a pair of left and right side beams 5 and 5,
A pair of front and rear lateral beams 6 and 6 connecting these are framed in a substantially H shape. Air springs 7, 7 are mounted on the central portions of the side beams 5, 5 in the front-rear direction, and by these, the vehicle body 2
Both ends in the width direction are elastically supported.

A pair of left and right wheels 4, 4 arranged at the front and rear
Is rotatably supported by the left and right axle boxes 9 and 9 via an axle 8, and the axle box 9 is supported by an axle box supporting device 20 on the bogie frame 3
It is located underneath. The shaft box 9 has a shaft box body 10 and a bearing 1
1 is internally provided, and both ends of the axle 8 are axially supported by the bearing 11. Also, each axle 8 has a gearbox 1
2 via a gear transmission system (not shown) stored in
It is linked to a main motor 13 mounted on the bogie frame 3.
Reference numeral 14 is a unit brake for stopping the wheels.

As shown in FIGS. 3 and 4, the concrete structure of the shaft box supporting device 20 is such that the shaft spring 21 is arranged right above the shaft box body 10 of the shaft box 9 and the shaft box body 10 is provided. The front end portion 22a of the support arm 22 is supported by the bogie frame 3 via the support rubber 23.

The shaft spring 21 receives the front and rear ends of the bogie frame 3, and is a double coil spring composed of two large and small coil springs 24 and 25. The shaft spring 21 stands upright on the shaft box body 10. It is arranged. That is, the spring seat 26 is attached to the upper surface 10a of the shaft box body 10 via the vibration-proof rubber 27, and the lower end of the shaft spring 21 is supported and fixed on the spring seat 26. On the other hand, the side beam 5 of the bogie frame 3
Spring caps 28 are fixedly mounted on the front and rear ends of the shaft spring 21, and the upper ends of the shaft springs 21 are supported and fixed in the spring caps 28.

Further, a shaft damper 29 is provided between the spring cap 28 and the shaft box body 10 (see FIG. 1), whereby a damping force is given to the vertical displacement of the shaft spring 21. Be done. Reference numeral 30 is a lift stopper attached to the spring cap 28. A locking protrusion 31 of the shaft box body 10 is inserted into the locking portion 30a of the lift stopper 30 in a loose fitting manner so that the shaft box body 10 does not fall when the carriage 1 is lifted. ..

The support arm 22 of the axle box body 10 is horizontally directed to one side in the front-rear direction, that is, backward in the front axle box body 10 and forward in the rear axle box body 10. It is extended. A cylindrical mounting hole 32 is vertically penetrated through the distal end portion 22a of the supporting arm 22, and the supporting rubber 23 is press-fitted concentrically into the mounting hole 32.

The support rubber 23 is an annular one that elastically supports the shaft box body 10 in the vertical, horizontal and longitudinal directions with respect to the bogie frame 3, and as shown in FIG. The laminated plates 33, 33, ... Are laminated concentrically with a gap, and the gap 34 is integrally filled with the rubber material 34. Spaces 23a, 23a are provided in a part of the support rubber 23 so as to extend in the radial direction, and thereby the rubber elastic force of the support rubber 23 is adjusted to a predetermined value. The support rubber 23 has a central support hole 2 at the center thereof.
3b, which is supported by the inner cylinder 35 attached to the bogie frame 3.

The inner cylinder 35 is vertically fixed to a lower portion of the bogie frame 3 and fixed in a hanging shape. The central support hole 23b of the support rubber 23 is inserted into and supported by the outer diameter of the inner cylinder 35. Has been done. That is, the inner diameter surface of the central support hole 23b and the outer diameter surface of the inner cylinder 35 are tapered surfaces that decrease in diameter downward, and the central support hole 23 of the support rubber 23 is formed.
The presser foot 3 is fitted to the outer diameter surface of the inner cylinder 35 from below and is fastened to the tip 35a of the inner cylinder 35.
It is fixed by 6.

By the supporting rubber 23 fixed in this way, the shaft box body 10 is elastically supported in the vertical, horizontal, and front-back directions with respect to the bogie frame 3, and when the shaft spring 21 expands and contracts. The rotational displacement around the axle 8 at is also minimized.

Next, the mechanism for suppressing the rotational displacement of the shaft spring 21 will be described with reference to the schematic structural diagrams of FIGS. 5 (a) to 5 (c). As shown in FIG. 5 (a), it is assumed that the support arm 22 is in a horizontal state, and the axial spring height at this time is h, the center point of the shaft box body 10 is P, and the support center point of the support rubber 23 is Is O, the distance between P and O is 1, and the spring constant of the support rubber 23 is k. Consider a case where the axial spring height h is displaced by δ in the vertical direction (extended in the figure) to a height of h + δ.

Assuming that the support rubber 23 is fixed to the elastic deformation in the vertical direction and only the rotational displacement around the support center point O of the shaft box body 10 is allowed, as shown in FIG. 5 (b). In addition, the shaft box body 10 (more precisely, the spring seat surface) is
The trolley frame 3 has an inclination angle θ with respect to the horizontal with the support center point O as the center.

At this time, the upper and lower end surfaces of the shaft spring 21 similarly have an inclination angle of θ, so that a bending moment M is generated in the shaft spring 21. As a result, a force to rotate the shaft box body 10 in the direction of the arrow A about the displacement center point P ′ acts as an axis, and at the support center point O of the support rubber 23, F is also applied. A vertical force of = M / l is applied.

However, since the support rubber 23 is fixed to be elastically deformed in the vertical direction, the shaft box body 10 cannot rotate in the direction of the arrow A, and the shaft box body 10 remains the above tilt angle θ. Is.

On the other hand, in the present invention, the support rubber 23 has a spring constant of k in the vertical direction and is elastically deformable in the vertical direction.

Therefore, the support center point O of the support rubber 23 is
However, as shown in FIG. 5 (c), by the action in the vertical direction F, it is displaced by x in the vertical direction to point O ', and the shaft box body 10
The rotation in the direction of arrow A stops. This displacement point O ′ indicates a state in which the spring force k · x of the support rubber 23 and the vertical force F ′ = M ′ / l acting on the tip portion 22a of the support arm 22 at this time are balanced by the same force. .. However, M ′ is a bending moment of the shaft spring 21 when the support center point of the support rubber 23 is at the point O ′.

From the above, when the axial spring 21 is displaced by δ in the vertical direction and the support rubber 23 is fixed in the vertical direction, the inclination angle of the shaft box body 10 becomes θ = δ / l ( On the other hand, when the support rubber 23 has a spring constant of k in the vertical direction, the displacement is reduced by x and the shaft box body 10
The inclination angle of is also θ ′ = (δ−x) · l = δ ′ / l,
θ ′ <θ.

That is, even if the same deflection δ is generated in the shaft spring 21, the supporting rubber 23 is elastically deformable in the vertical direction, so that the bending moment generated in the shaft spring 21 is used to utilize the bending force of the shaft box body. It is possible to reduce the inclination.

[0030]

As described in detail above, according to the present invention, excellent effects as listed below can be obtained.

(1) The tip end of the support arm of the axle box is supported by the bogie frame via the support rubber, and the support rubber makes the axle box vertically, horizontally and longitudinally with respect to the bogie frame. Since the structure is elastically supported to reduce the rotational displacement of the axle box around the axle, a good ride comfort is ensured.

That is, when the bogie frame is displaced in the vertical direction, the shaft box body tries to rotate downward about the tip support portion of its support arm due to the elastic force of the shaft spring in the axial direction. The bending moment generated on the shaft box acts to rotate the tip end side of the support arm of the shaft box downward, and the rotational force in the direction opposite to the shaft spring acts on the shaft box.

In the present invention, this acting force is utilized by making the support rubber elastically deformable in the vertical direction as well, allowing the downward rotation of the tip end side of the support arm to allow the axial box to be rotated. It offsets the rotational displacement from the normal state of the body. This allows
It is possible to prevent a reduction in riding comfort due to the rotational displacement of the axle box.

(2) As a result of the rotational displacement of the shaft box being reduced,
The length of the support arm of the axle box can be significantly shortened compared to the conventional axial burr type, and along with this, the cross-sectional shape of the support arm can also be set small. The weight of the axle box itself can be reduced.

(3) Since the support arm of the axle box can be shortened, the lateral moment applied to the bearing of the axle box when a load in the left and right direction acts on the bogie frame is small, and the life of the bearing can be extended. (4) Further, if the support arm of the axle box can be shortened, there is a space between the tip of the support arm and the bogie frame, and a sufficient mounting space for the support rubber fitted therein can be secured. As a result, the degree of freedom in selecting the shape and size of the support rubber is large, and optimum support rigidity can be obtained for the axle box support device.

(5) Furthermore, if the supporting arm of the shaft box can be shortened, the moment force acting on the shaft spring can be reduced, and thus the stress generated in the shaft spring can be suppressed to a small value and the life of the shaft spring can be reduced. Can be extended.

(6) Since the support rubber has elasticity in all directions including the vertical direction, it is possible to insulate the vibration generated by the rotation of the wheels while the vehicle is running from being transmitted to the bogie frame through the axle box. However, a good ride comfort can be secured.

[Brief description of drawings]

FIG. 1 is a side view showing a bogie portion of a railway vehicle equipped with an axle box supporting device according to an embodiment of the present invention.

FIG. 2 is a plan view showing a bogie portion of the railway vehicle.

FIG. 3 is a side enlarged view showing a partially cutaway view of the axle box supporting device in the bogie portion.

4 is a sectional view of the coaxial box support device taken along line IV-IV in FIG.

5A and 5B are schematic structural diagrams for explaining the mechanism for suppressing the rotational displacement of the shaft spring in the coaxial box device, in which (a) shows the normal state in which the support arm is in a horizontal state, and (b) shows the support rubber in the vertical direction. Shows the state where the axial spring height is vertically displaced when the elastic deformation is fixed. (C) shows the axial spring height vertically displaced when the supporting rubber is elastically deformable vertically. Shows the state of

FIG. 6 is a side view showing a conventional shaft burr type shaft box supporting device.

[Explanation of symbols]

 1 bogie 3 bogie frame 4 wheel 8 axle 9 axle box 10 axle box body 20 axle box support device 21 axis spring 22 axle box support arm 22a support arm tip 23 support rubber 23a support rubber space 23b support rubber center Support hole 32 Mounting hole for support arm 33 Laminated plate 34 Rubber material 35 Inner cylinder

Claims (5)

[Claims] 1. A shaft spring for supporting a bogie frame is arranged in an upright state directly above the shaft box body, and a support arm of the shaft box body is provided so as to extend to one side in the front-rear direction and its tip end. A part is supported by the bogie frame via a supporting rubber, and the supporting rubber moves the shaft box body up and down with respect to the bogie frame,
An axle box support device for a railway vehicle, which is structured to elastically support in the left-right and front-rear directions, whereby the rotational displacement of the axle box around the axle is reduced. 2. A mounting hole is provided at an end of a support arm of the shaft box body so as to extend in a vertical direction, and the annular support rubber is fitted into the mounting hole concentrically with the mounting hole. The axle box support device for a rail vehicle according to claim 1, wherein an inner cylinder extends vertically and is fixed to the bogie frame, and the center support hole of the support rubber is inserted and supported in the inner cylinder. 3. The railcar shaft according to claim 2, wherein the support rubber is formed by stacking a plurality of laminated plates concentrically with a gap, and filling a rubber material integrally in these gap portions. Box support device. 4. The rail car axle box support device according to claim 3, wherein a space for ensuring a predetermined rubber elasticity is provided in a part of the support rubber. 5. The axle box support device for a railway vehicle according to claim 2, wherein the inner diameter surface of the central support hole of the support rubber and the outer diameter surface of the inner cylinder are tapered surfaces that decrease in diameter downward. ..