JP2000225941A - Vibration control rubber bushing for rolling stock shaft beam device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce machining hours, number of part items and man hours for assembly and improve the durability of the whole of a rolling stock shaft beam device by securing a specified vibration control function for a long time. SOLUTION: A projection 14, which is projected in a radial direction by burring a part of the external cylinder 11 covering all over the external periphery of the cylindrical rubber elastic body 10, a vibration control rubber bushing, which is fittedly fixed to the cylindrical housing section 4 continuously arranged at the end section of a shaft beam 3 and the center shaft 7 of which is unrotatably fixed to a truck frame 8, is formed. The relative slide between the cylindrical rubber elastic body 10 and the cylindrical housing section 4 when the shaft beam 3 rotates around the center shaft 7 is prevented by engaging this projection 14 in the recessed section 13 formed on the internal wall of the cylindrical housing 4.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an anti-vibration rubber bush for a railroad vehicle axle beam device, and more particularly, to one end of an axle beam extending in a vehicle traveling direction from an axle box portion supporting an axle of a railroad vehicle. The present invention relates to an anti-vibration rubber bush for a railroad vehicle shaft beam device that is used to be connected to one end portion of a shaft beam and a bogie frame when connected and supported.

[0002]

2. Description of the Related Art This type of railcar shaft beam device is arranged and fixed to a cylindrical housing portion provided at one end of the shaft beam at a center axis perpendicular to a vehicle traveling direction and at an outer periphery of the center shaft. A vibration-proof rubber bush consisting of a cylindrical rubber elastic body formed and an outer cylinder fixed so as to cover the entire outer peripheral surface of the cylindrical rubber elastic body is fitted and fixed, and the center axis of the vibration-proof rubber bush is fixed. By being fixed to the bogie frame so as not to be rotatable, rotation of the shaft beam about the central axis of the shaft beam is allowed based on the elastic action of the cylindrical rubber elastic body of the vibration-isolating rubber bush, and a connecting portion between the shaft beam and the bogie frame. It exhibits a vibration-proof function such as absorbing vibrations and shocks.

In order to reliably exert the above-described vibration damping function, it is necessary to prevent relative slippage between the cylindrical rubber elastic body and the cylindrical housing portion during the rotation about the central axis of the shaft beam. As a countermeasure for preventing relative slippage, conventionally, as disclosed in Japanese Utility Model Application Laid-Open No. Hei 6-23863, for example, a pin hole is provided on the inner peripheral side of a housing portion, and a pin hole is fixed by being pushed into the pin hole. Means has been adopted in which a pin hole in which a protruding portion of the mating pin is inwardly engaged is formed in the outer cylinder and the cylindrical rubber elastic body of the vibration-proof rubber bush.

[0004]

However, in the conventional railcar axle beam device as described above, not only the inner peripheral side of the cylindrical housing portion but also the outer cylinder and the cylindrical rubber elastic body side of the vibration-proof rubber bush. It is not only necessary to precisely form the pin holes so that there is no misalignment, but also, after the engaging pins are pushed and fixed in the pin holes of the cylindrical housing, Is troublesome assembling such that the protruding portion engages with the pin holes on the outer cylinder and the cylindrical rubber elastic body side of the vibration-proof rubber bush. Moreover,
Stress concentrates on the pin hole portion on the rubber elastic body side via the engaging pin, so that the rubber elastic body is easily cracked or the like, and the predetermined vibration isolating function cannot be maintained for a long period of time. There was a problem of lack of durability.

The present invention has been made in view of the above circumstances, and can reduce the number of processing, the number of parts, and the number of assembling steps. An object of the present invention is to provide an anti-vibration rubber bush for a railway beam shaft device capable of improving durability.

[0006]

In order to achieve the above object, a vibration isolating rubber bush for a railcar axle beam device according to the present invention is provided with a center axis perpendicular to a vehicle traveling direction and an outer periphery of the center axis. An anti-vibration rubber bush having a cylindrical rubber elastic body disposed and fixed and an outer cylinder fixed so as to cover the entire outer peripheral surface of the cylindrical rubber elastic body, wherein the outer cylinder is an axle of a railway vehicle. Axle beam extending from the axle box portion in the vehicle traveling direction to the end portion of the shaft beam is disposed continuously in a horizontal posture perpendicular to the vehicle traveling direction, and is divided into two halves in the vehicle traveling direction. In a vibration-absorbing rubber bush for a railroad vehicle axle beam device, the body is fitted and fixed to a cylindrical housing portion that can be fastened to each other, and the center axis thereof is fixed to the bogie frame so as not to rotate. Outer diameter by burring on part of the tube Forming a convex portion of cylindrical shape and protrudes,
By engaging the convex portion with a concave portion formed on the inner peripheral side of the cylindrical housing portion, the relative sliding between the cylindrical rubber elastic body and the cylindrical housing at the time of rotational movement about the central axis of the shaft beam is reduced. It is characterized in that it is configured to prevent such a situation.

According to the present invention having the above-described structure, a cylindrical projection formed in a part of the outer cylinder of the vibration-isolating rubber bush so as to project radially outward by burring is formed in a cylindrical shape. By engaging with the concave portion formed on the inner peripheral side of the housing portion, it is possible to prevent relative slip between the cylindrical rubber elastic body and the cylindrical housing portion at the time of rotational movement around the central axis of the shaft beam. In order to prevent relative slippage, it is not necessary to use an engaging pin, which is a small part, separately from the cylindrical rubber elastic body and the cylindrical housing part.
The number of assembly steps can be reduced. Also, since it is not necessary to provide a pin hole on the rubber elastic body side of the vibration-proof rubber bush,
This rubber elastic body does not cause stress concentration that causes damage such as cracks, and the vibration damping function as specified can be maintained for a long period of time to improve the durability of the entire shaft beam device. It is.

[0008]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a partially cutaway side view of a railroad vehicle axle beam device according to an embodiment of the present invention, and shows an axle beam from an axle box portion 2 supporting an axle 1 of a railroad vehicle in a vehicle traveling direction (arrow Y direction). A cylindrical housing 4 is connected to one end of the shaft beam 3.
An outer cylinder 11 of an anti-vibration rubber bush 6, which will be described later, is fitted and fixed in a fitting hole 5 of the cylindrical housing portion 4, and both ends of the center shaft 7 of the anti-vibration rubber bush 6 are connected to a bogie frame 8.
Fixed to the central axis 7 of the beam 3
It is configured to allow a rotational movement around and absorb vibrations and shocks at a connecting portion between the shaft beam 3 and the bogie frame 8.

The housing part 4 is a half-split type which is divided into two parts in the vehicle traveling direction (arrow Y direction), and one half body 4A is integrated with the shaft beam 3 as shown in FIG. Of the vibration-isolating rubber bush 6 by applying a predetermined tightening force to the vibration-isolating rubber bush 6 at the time of the fastening. Is configured to apply pre-compression.

The vibration-proof rubber bush 6 is shown in FIGS.
As shown in the figure, a central shaft integrally formed with flange portions 7b, 7b at both axial ends of a mandrel portion 7a having a solid section and arranged in a horizontal posture perpendicular to the vehicle traveling direction (direction of arrow Y). 7
And arranged on the outer periphery of the central shaft 7, and
Cylindrical rubber elasticity having flange-shaped portions 10b, 10b integrally provided at both axial ends of the cylindrical portion 10a enclosing the mandrel 7a so as to correspond to the flange-shaped portions 7b, 7b at both ends of the central shaft 7. Body 10 and both end flange-shaped portions 1 of this rubber elastic body 10
The outer cylinder 11 is made of a thin metal plate and covers the entire outer peripheral surface including the outer cylinders 0b and 10b.

As shown in FIG. 2, notches 12, 12 are formed at two locations in the diameter direction of the rubber elastic body 10 in the vibration-proof rubber bush 6, so that the rubber elastic body 10 can travel in the vehicle. Are divided into two blocks 10A and 10B in the direction (the direction of the arrow Y), and the outer cylinder 11 is divided into two corresponding to this, and each divided outer cylinder 11
A and 11B are respectively fixed to the outer peripheral surfaces of the block bodies 10A and 10B.

As shown in FIG. 4, a circular hole 14a is formed in the axially central portion of one of the outer cylinders 11A of the outer cylinder 11 in the vibration-proof rubber bush 6 having the above-described structure.
By applying a burring process for expanding the edge of the hole 14a into a cylindrical shape, the cylindrical convex portion 14 protruding outward in the radial direction is integrally formed, while one half 4A of the cylindrical housing portion 4 is formed. A concave portion 13 is formed at a location corresponding to the above-mentioned convex portion 14 on the inner peripheral side.

In the railcar axle beam device having the above components, the outer cylinder 11 of the vibration-proof rubber bush 6 is fitted into the other half body 4B of the cylindrical housing part 4 in a half-shape. The central shaft 7 is fitted into the hole 5 and
Are fixed to the bogie frame 8 so that they cannot rotate, and the above-mentioned cylindrical convex portion 14 of the vibration-proof rubber bush 6 protrudes radially outward from one of the divided outer cylinders 11A of the outer cylinder 11. By fastening one half body 4A of the cylindrical housing part 4 to the other half body 4B via the bolt 9 so that the recess 13 is engaged, the cylindrical rubber of the vibration-proof rubber bush 6 is formed. Preliminary compression is applied to the elastic body 10, and the assembled state in which the relative slippage between the cylindrical rubber elastic body 10 and the cylindrical housing part 4 is prevented by the engagement between the convex portion 14 and the concave portion 13 is obtained.

According to the railcar axle beam device in such an assembled state, when the axle 1 and the bogie frame 8 are vertically displaced relative to each other, the elastic action of the cylindrical rubber elastic body 10 of the vibration-proof rubber bush 6 is used. A predetermined vibration-proof function, such as allowing rotation of the shaft beam 3 around the central axis 7 and properly absorbing vibration and impact at each connection portion between the shaft beam 3 and the bogie frame 8, is reliably exhibited. Will be.

In the above-described embodiment, the cylindrical rubber elastic body 10 in the vibration isolating rubber bush 6 is divided into two blocks 10A and 10B in the vehicle traveling direction (the direction of the arrow Y). May be divided into three or more blocks.

[0016]

As described above, according to the present invention, the rotation of the shaft beam around the central axis is allowed based on the elastic action of the cylindrical rubber elastic body of the vibration-proof rubber bush, and the shaft beam and the bogie frame are provided. As a measure to prevent relative slippage between the cylindrical rubber elastic body and the cylindrical housing, which is indispensable to reliably exhibit vibration damping functions such as absorbing vibration and shock at the connection part with the Since a cylindrical projection formed so as to protrude radially outward on a part of the cylinder by burring is engaged with a recess formed on the inner peripheral side of the cylindrical housing, a cylindrical shape is adopted. It is not necessary to use an engaging pin, which is a small part, separately from the rubber elastic body and the cylindrical housing part, and it is possible to reduce the number of parts, and it is also unnecessary to drive the pin and to reduce the number of assembling steps.
In addition, since it is not necessary to form a pin hole that generates stress concentration that causes damage such as cracking in the rubber elastic body of the vibration-isolating rubber bush, it is possible to ensure a predetermined vibration-isolating function for a long period of time. There is an effect that the durability of the entire shaft beam device can be improved.

[Brief description of the drawings]

FIG. 1 is a partially cutaway side view of a railcar axle beam device according to an embodiment of the present invention.

FIG. 2 is an enlarged vertical sectional side view of a main part of the same device.

FIG. 3 is an enlarged cross-sectional plan view of a main part of the same device.

FIG. 4 is an enlarged view of a main part of FIG. 3;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Axle 2 Axle box part 3 Shaft beam 4 Cylindrical housing part 4A, 4B Half body 6 Vibration-proof rubber bush 7 Center shaft 8 Bogie frame 10 Rubber elastic body 11 Outer cylinder 13 Concave part 14 Cylindrical convex part

Claims (1)

[Claims] 1. A central axis perpendicular to a traveling direction of a vehicle, a cylindrical rubber elastic body disposed and fixed on the outer periphery of the central axis, and fixed so as to cover the entire outer peripheral surface of the cylindrical rubber elastic body. A rubber bush having an outer cylinder, the outer cylinder being perpendicular to the vehicle traveling direction at the end of a shaft beam extending in the vehicle traveling direction from the axle box portion supporting the axle of the railway vehicle. In a horizontal position, and the two divided halves in the vehicle traveling direction are fitted and fixed to a cylindrical housing part which can be fastened to each other, and the center axis thereof is connected to the bogie frame. In a vibration damping rubber bush for a railway vehicle shaft beam device that is used by being fixed non-rotatably, a cylindrical convex portion protruding radially outward by burring processing is formed on a part of the outer cylinder, and this convex portion is formed as described above. Engage with the recess formed on the inner peripheral side of the cylindrical housing The above structure prevents the cylindrical rubber elastic body and the cylindrical housing from slipping relative to each other during rotational movement about the central axis of the shaft beam. Vibration rubber bush.