JPH11325145A - Vibration isolating rubber bush - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve the ride quality when a vibration isolating rubber bush is used for a connection device for vehicles by reducing the spring constant, to ensure the durability on a specified level, and to reduce the shock feeling when a stopper is in operation without operation as the stopper except in the input direction (a working direction of a major load). SOLUTION: A shaft body 18 is fixed to a center part of a rubber elastic body 17, an outer circumferential surface of the rubber elastic body 17 is fixed to an outer circumferential member 19, the shaft body 18 and the outer circumferential member 19 are respectively connected and fixed to members to be connected, and a stopper member 27 abutted on a fitting inner diameter part 15 of one of the members to be connected is tightened and fixed to the shaft body 18 when the displacement in the input direction (the working direction of a major load) reaches a specified value.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vehicle connecting device such as a connecting device between a towing truck and a vehicle body or a connecting device provided between an axle box and a vehicle frame to support an axle axle box. The present invention relates to an anti-vibration rubber bush suitable for use in various types of anti-vibration support devices.

[0002]

2. Description of the Related Art In a railway vehicle, for example, a vehicle body is mounted on a towing vehicle via a vibration isolating support device such as an air spring, and the towing vehicle and the vehicle body are connected by a connecting device. ing. In general, the connecting device employs a configuration in which a connecting member such as a connecting link is connected to a bogie and a vehicle body via an anti-vibration rubber bush.

In the vibration-proof rubber bush, a shaft (usually a metal such as steel) is fixed to a center portion of a rubber elastic body in the form of a rotating body, and an outer peripheral surface of the rubber elastic body is attached to an outer peripheral member (usually steel). And the like, and is attached so as to transmit a force between the shaft body and the outer peripheral member via the rubber elastic body. In this type of vibration-proof rubber bush, it is necessary to soften the spring characteristic in a region where the deformation of the rubber elastic body is small, and to suppress the deformation when the deformation of the rubber elastic body reaches a certain amount. The reason is,
It is necessary to reduce the spring constant of the vibration-isolating rubber bush in order to improve the riding comfort of the vehicle. On the other hand, if the spring constant is reduced, the movement increases and the rubber elastic body is easily damaged at an early stage. . For this reason, in this type of vibration-proof rubber bush, when the deformation in the radial direction (for example, the input direction in which a main load is applied) reaches a certain amount, a stopper means for further suppressing the deformation is provided. Has been proposed. A document disclosing such a stopper means is, for example, Japanese Utility Model Publication No. 3-6539.

[0004]

However, in the conventional stopper means of the vibration-proof rubber bush, for example, a structure in which a flange-shaped stopper is provided integrally with the shaft body (inner cylinder) is employed. There are technical issues to be solved. That is, since the stopper is provided over the entire circumference, an unnecessary direction also acts as a stopper, or since the stopper is formed of metal, a sense of shock (a degree of impact) at the time of the stopper operation is reduced. There is a problem that it becomes larger.

[0005] The present invention has been made in view of such technical problems, and an object of the present invention is to set a small spring constant of a rubber elastic body which affects riding comfort when used in a vehicle coupling device. The main load direction (input direction)
In other words, an object of the present invention is to provide an anti-vibration rubber bush that does not act as a stopper and can reduce a sense of shock when the stopper acts.

[0006]

According to a first aspect of the present invention, in order to achieve the above object, a shaft body is fixed to a center portion of a rubber elastic body in the form of a rotating body, and an outer peripheral surface of the rubber elastic body is circumferentially fixed. In a vibration-proof rubber bush, which is fixed to the member, the shaft body is fixed to one connected member, and the outer peripheral member is press-fitted and fixed to a fitting inner diameter portion of the other connected member. The stopper member which comes into contact with the fitting inner diameter portion when the displacement of the shaft reaches a predetermined amount is fastened and fixed to the shaft body.

According to a second aspect of the present invention, in addition to the configuration of the first aspect, the stopper member is formed of a hard rubber, a hard resin, or a metal, and the stopper member has a fitting inner diameter portion. The contact range is about 30 degrees to 80 degrees in circumferential angle, the stopper member is provided at one position in the input direction, or the stopper member is provided at two positions in the input direction and on the opposite side in the diameter direction. By adopting a configuration,
The above object is achieved more efficiently.

[0008]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a side view showing a schematic configuration of a connecting device between a bogie and a vehicle body of a railway vehicle suitable for using the vibration-proof rubber bush according to the present invention. In FIG.
A vehicle body 4 is mounted on a truck 2 that supports the wheels 1 via a vibration isolating support device (suspension device) 3 such as an air spring. A connecting link 5 is attached between the truck 2 and the vehicle body 4. I have. The connecting link 5 is connected to the bogie 2 and the vehicle body 4 at both end portions via vibration-proof rubber bushes 6, 6. The anti-vibration rubber bush 6 includes the carriage 2 and the vehicle body 4.
In addition to transmitting the force while absorbing vibrations and shocks between them, it absorbs the relative movement.

FIG. 2 is a side view of the connecting device of FIG. 1 using one embodiment of the vibration-proof rubber bush to which the present invention is applied.
FIG. 3 is a partial cross-sectional view taken along line 3-3 in FIG. 2, FIG. 4 is a cross-sectional view taken along line 4-4 in FIG. 3, and FIG. FIG. 5 is a side view of the vibration-proof rubber bush from which the cylindrical portion is omitted when viewed from 5. In FIG. 2, fitting inner diameter portions 15, 15 having a left-right axis are formed at both front and rear ends of a connecting link 5 attached to extend substantially horizontally in the front-rear direction between the carriage 2 and the vehicle body 4. Have been. In the illustrated example, the fitting inner diameter portion 15 is formed by integrating the cylindrical member 26 by welding or the like.

A bogie 2 is provided at the fitting inner diameter portion 15 at the left end in the drawing.
An anti-vibration rubber bush (anti-vibration rubber bush to which the present invention is applied) 16 for connecting the cylindrical holders 12 and 12 on the side and the illustrated left end of the connection link 5 is mounted, and is fitted to the illustrated right end. In the combined inner diameter portion 15, the cylindrical holder 12 on the vehicle body 4 side,
Anti-vibration rubber bush for connecting the 12 and the right end of the connection link 5 in the drawing (anti-vibration rubber bush to which the present invention is applied)
16 are mounted. That is, the anti-vibration rubber bushes 16 to which the present invention is applied are used as the anti-vibration rubber bushes 6 in FIG. In FIG. 2, 2
3 is a bolt for fastening and fixing the shaft 18 to the cylindrical holder 12, 24 is a through hole of the cylindrical holder 12, 2
Reference numeral 5 denotes a nut for fastening the bolt 23.

In FIG. 2 to FIG.
6 is a shaft body 18 at the center of a rubber elastic body 17 in the form of a rotating body.
(Usually, metal such as steel) is fixed by vulcanization or adhesion, and the outer peripheral surface of the rubber elastic body 17 is fixed to the inner surface of the outer peripheral member 19 (normally, metal such as steel) by vulcanization or adhesion. It has a structure. In the illustrated example, although the rubber elastic body 17 is integral as shown in FIG. 3, the rubber elastic body 17 is in the form of a rotating body substantially divided in the axial direction, with the intermediate portion connected by a thin portion. A substantially spherical bulge 20 as shown in the figure is formed in the middle of the shaft 18, while the inner surface of the middle of the rubber elastic body 17 also forms a substantially partial spherical surface. By fixing the partial spherical surface to the bulging portion 20, both are fixed to each other. The outer peripheral member 19 is composed of two axially divided parts. The outer peripheral surface of the rubber elastic body 17 has two partial spherical surfaces divided in the axial direction. Are fixed to the respective partial spherical surfaces. The outer peripheral surfaces of the outer peripheral members 19 and 19 form the same straight cylindrical surface. The front and rear vibration-proof rubber bushes 16 and 16 are fixed by press-fitting the outer peripheral surfaces of the respective outer peripheral members 19 to the front and rear fitting inner diameter portions 15 of the connecting link 5.

Both ends of the shaft body 18 protrude to both sides as shown in FIGS. 3 and 5, and a substantially vertical flat surface (bearing surface) 21 is formed before and after the protruding portions on both sides. And
At both ends of the shaft 18, front and rear horizontal mounting holes 22 penetrating front and rear flat surfaces (bearing surfaces) 21 are formed. Shaft body 1 of anti-vibration rubber bush 16 on the left side of FIG. 2
8 are for connecting the vibration-proof rubber bush 16 to the cylindrical holder 12 on the carriage 2 side, and are used to mount the shaft 18 of the vibration-proof rubber bush 16 on the right side in FIG. The hole 22 is for connecting the vibration-proof rubber bush 16 to the cylindrical holder 12 on the vehicle body 4 side.

As described above, the anti-vibration rubber bush 16 is provided at the center of the rubber elastic body 17 in the form of a rotating body.
8, the outer peripheral surface of the rubber elastic body 17 is fixed to an outer peripheral member 19, and the shaft 18 is connected to one of the connected members (for example, the bracket 11 on the truck 2 or the vehicle body 4).
The outer peripheral member 19 is press-fitted and fixed to the fitting inner diameter portion 15 of the other connected member (the connecting link 5). The vibration isolating rubber bush 16 used in the vehicle coupling device described as the embodiment of the present invention mainly receives a traction force, and the input direction, which is the main load application direction, is the horizontal direction (the vehicle direction). Front-back direction).

3 to 5, in the vibration-proof rubber bush 16, when the displacement in the input direction (vertical direction in FIGS. A stopper member 27 abutting on the portion 15 is fastened and fixed to the shaft body 18 by a bolt 28. In the illustrated example, a part (upper part) of a thin part in the middle part of the rubber elastic body 17 is cut out, and a seat surface 29 is formed in a corresponding part (upper surface) of the middle bulging part 20 of the shaft body 18. A block-shaped stopper member 27 is fastened and fixed to the seat surface 29 by bolts 28, 28.

As the material of the stopper member 27, for example, hard rubber, hard resin, metal or the like can be used. When the displacement in the input direction reaches a certain amount, the range in which the stopper member 27 contacts (presses) the fitting inner diameter portion 15 is, for example, about 30 in a circumferential angle indicated by θ in FIG. Degrees to about 80 degrees. FIG. 6 is a graph illustrating the operation characteristics of the vibration-proof rubber bush 16. In FIG. 6, when the shaft 18 of the vibration-proof rubber bush 16 receives input and is displaced upward, the stopper member 27 abuts on the upper part of the fitting inner diameter portion 15, the reaction force increases, and the displacement is regulated.

According to the embodiment described above, the shaft 18 is fixed to the center of the rubber elastic body 17 in the form of a rotating body, and the outer peripheral surface of the rubber elastic body 17 is fixed to the outer peripheral member 19. The shaft 18 is fixed to one connected member (the trolley 2 or the vehicle 4), and the outer peripheral member 19 is press-fitted and fixed to the fitting inner diameter portion 15 of the other connected member (the connection link 5). In the vibration-proof rubber bush, the stopper member 27 that comes into contact with the fitting inner diameter portion 15 is fastened and fixed to the shaft 18 when the displacement in the input direction (main load direction) reaches a certain amount. At the time of a large input, the stopper member 27 suppresses the movement to restrict the movement of the vehicle 4 and at the same time suppresses the distortion of the rubber elastic body 17 within a certain range, thereby ensuring durability. Become a vehicle It is possible to improve the ride comfort.

Further, since the stopper member 27 does not act as a stopper except in the input direction (main load direction), a sense of shock when the stopper acts can be reduced. In the illustrated embodiment, the stopper member 27 is provided only on the upper side in the vertical direction, which is the input direction. However, in some cases, the stopper member 27 may be provided at two places, the input direction and the diametrically opposite side (in the illustrated embodiment, the upper and lower sides). (Two places).

[0018]

As is apparent from the above description, according to the first aspect of the present invention, the shaft is fixed to the center of the rubber elastic body in the form of a rotating body, and the outer peripheral surface of the rubber elastic body is fixed to the outer peripheral member. The shaft member is fixed to one of the connected members, and the outer peripheral member is press-fitted and fixed to the fitting inner diameter portion of the other connected member. When the displacement reaches a certain amount, the stopper member that comes into contact with the fitting inner diameter portion is configured to be fastened and fixed to the shaft body, so that the rubber elastic body that affects the riding comfort when used in the vehicle coupling device is used. The spring constant can be set small, and the durability can be maintained at a desired constant level.
Provided is a vibration-proof rubber bush that does not act as a stopper in a direction other than the main load direction and can reduce a shock feeling when the stopper acts.

According to the second to fifth aspects of the present invention, in addition to the configuration of the first aspect, the stopper member is formed of hard rubber, hard resin or metal, and the fitting inner diameter portion of the stopper member is provided. The stopper member is provided at one position in the input direction, or the stopper member is provided in one of the input direction and the opposite side in the diameter direction. Because it was configured to be provided at the location,
The above effects can be realized more efficiently.

[Brief description of the drawings]

FIG. 1 is a side view showing a schematic configuration of a coupling device between a bogie and a vehicle body of a railway vehicle suitable for using a vibration-proof rubber bush according to the present invention.

FIG. 2 is a side view of the connecting device of FIG. 1 using one embodiment of a vibration-proof rubber bush to which the present invention is applied.

FIG. 3 is a partial sectional view taken along line 3-3 in FIG. 2;

FIG. 4 is a sectional view taken along lines 4-4 in FIG. 3;

5 is a side view of the anti-vibration rubber bush without the cylindrical portion as viewed from an arrow line 5-5 in FIG. 4;

FIG. 6 is a graph illustrating the operation characteristics of the vibration-proof rubber bush according to the present invention.

[Explanation of symbols]

 2 Bogie 4 Body 5 Connecting Link 11 Bracket (Bogie) 12 Cylindrical Holder 13 Bracket 15 Fitting Inner Diameter 16 Vibration Isolating Rubber Bush 17 Rubber Elastic Body 18 Shaft 19 Outer Peripheral Member 22 Mounting Hole 23 Bolt 24 Through Hole 25 Nut 27 Stopper member 28 Bolt

Claims (5)

[Claims] 1. A shaft body is fixed to a center portion of a rubber elastic body in the form of a rotating body, and an outer peripheral surface of the rubber elastic body is fixed to an outer peripheral member, and the shaft body is fixed to one connected member. Then, in the vibration-proof rubber bush used by press-fitting and fixing the outer peripheral member to the fitting inner diameter portion of the other connected member, when the displacement in the input direction reaches a certain amount, the outer circumferential member comes into contact with the fitting inner diameter portion. A vibration-proof rubber bush, wherein a stopper member is fastened and fixed to the shaft. 2. The anti-vibration rubber bush according to claim 1, wherein the stopper member is formed of hard rubber, hard resin, or metal. 3. The vibration isolating rubber bush according to claim 1, wherein a contact range of the stopper member with the fitting inner diameter portion is about 30 degrees to 80 degrees in a circumferential angle. 4. The anti-vibration rubber bush according to claim 1, wherein the stopper member is provided at one position in the input direction. 5. The anti-vibration rubber bush according to claim 1, wherein the stopper member is provided at two positions, that is, in the input direction and on the opposite side in the diameter direction.