JPH076011U - Railway vehicle braking system - Google Patents

Abstract

(57) [Summary] [Purpose] The brake shoe is smoothly restored when braking is released. [Structure] A piston 5 for pressing a brake shoe 1 in response to a fluid pressure against a disk that rotates integrally with an axle, and a caliper body 3 fixedly mounted on the trolley side in which the piston 5 is slidably accommodated. The brake shoe 1 is supported by the torque pin 4 via the brake shoe guide 11, while the torque pin 4 is slidably mounted in the axle direction by the torque receiving body 30 fixed at a predetermined position of the caliper body 3. , Torque receiving body 3
A spring 40 for urging the torque pin 4 in the direction away from the disc is interposed between 0 and the torque pin 4, and the spring 40 is arranged coaxially with the torque pin 4.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 TECHNICAL FIELD The present invention relates to an improvement of a braking device for a railway vehicle.

[0002]

[Prior art]

 While a disk that rotates together with the wheels is installed as the speed of railway vehicles increases, a caliper body fixed on the bogie side is equipped with a piston that operates by fluid pressure, and a pair of calipers supported by the caliper body are installed. A caliper brake with a disc placed between the wheels is adopted.By supplying pressure fluid to the piston, the disc is clamped by the brake shoe, and the brake torque is obtained by the frictional force generated between the brake shoe and the disk. ing.

[0003]

[Problems to be solved by the device]

 By the way, in the above caliper brake, the torque pin that locks the brake shoe that is about to be displaced in the circumferential direction of the disc due to the brake torque is freely supported by the caliper body, while the brake shoe after braking is supported by the caliper body. A spring for returning toward the torque pin is supported by the caliper body at a predetermined distance from the torque pin, and the brake shoe returns to the predetermined return position during power running or coasting operation of the railway vehicle, and the spring is provided between the brake shoe and the disc. It is held at a predetermined interval by the urging force of.

However, in the above-mentioned conventional device, when the brake is released and the brake shoe is returned, the force of the spring also acts in the direction of twisting the torque pin, so that the torque pin is fixed to the caliper body and the brake shoe has a predetermined shape. In some cases, it did not return to the position.

Therefore, an object of the present invention is to provide a braking device for a railway vehicle capable of smoothly returning the brake shoe when braking is released.

[0006]

[Means for Solving the Problems] The present invention provides a piston that presses a brake shoe according to a fluid pressure against a disk that rotates integrally with an axle, and a piston that is slidably accommodated in a bogie side. In a braking device for a railway vehicle including a fixed caliper body, the brake shoe is supported by a guide member, and the guide member is fixed in a predetermined position of the caliper body in a vehicle axial direction. An elastic member that is slidably accommodated and that urges the guide member away from the disc is interposed between the torque receiving main body and the guide member, and the elastic member is coaxial with the guide member. To be installed.

[0007]

[Action]

 When a predetermined pressure fluid is supplied, the piston extends from the caliper body toward the disc against the biasing force of the elastic member and presses the brake shoe against the disc, generating a brake torque between the brake shoe and the disc. . At this time, the internal member accommodated in the torque receiving body is displaced in the axle direction together with the brake shoe as the piston extends, while holding the brake shoe against the brake torque in the circumferential direction of the disc. The braking is released by discharging the piston fluid, and the elastic member interposed between the guide member and the caliper body causes the guide member to move away from the disc, causing the guide member to move. The brake shoe is also displaced in the direction away from the disc, and the piston is pressed in the contracting direction via the brake shoe, so that a predetermined gap is formed between the brake shoe and the disc.

[0008]

【Example】

 1 to 3 show an embodiment of the present invention.

In FIGS. 1 and 2, a pair of brake shoes 1, 1 A are arranged at positions facing each other on predetermined side surfaces of a disk 2 integrally provided with a wheel (not shown).

The caliper body 3 is fixed to a dolly (not shown) via a support frame 10, and in FIG. 1, a guide member is provided on each of the torque receiving bodies 30 and 30 which are fastened to predetermined positions at both ends of the caliper body 3. The torque pins 4 and 4 are accommodated, and the pistons 5 and 5 are accommodated at predetermined positions of the caliper body 3 between the torque pins 4 and 4.

As shown in FIG. 2, the torque pin 4 and the piston 5 are slidably mounted in the torque receiving body 30 and the caliper body 3 in a direction orthogonal to the disc 2, that is, in the axle direction (not shown). 4 supports the brake shoe guide 11, while the brake shoe 1A is supported by the caliper body 3A.

As shown in FIG. 3, a cylindrical oil chamber 50 that opens to the brake shoe 1 side is formed at a predetermined position of the caliper body 3, and the piston 5 has the piston 5 at the inner periphery of the oil chamber 50. It is slidably supported toward. The end of the piston 5 on the brake shoe 1 side abuts the brake shoe guide 11 via the plate-shaped heat insulating member 53, while the piston 5 is housed in the oil chamber 50 on the inner circumference of the oil chamber 50 side. A spring 54 for urging the piston 5 toward the brake shoe 1 contacts.

A seal 52 supported by the caliper body 3 is slidably contacted with a predetermined outer circumference of the piston 5, and an annular shape for preventing foreign matter from being mixed between the end portion of the outer circumference of the piston 5 and the caliper body 3. Boots 51 are provided.

The torque pin 4 is formed inside the torque receiving body 30 that is fastened to the caliper body 3, and is freely slidable in the axial direction of the wheel (not shown) in the cylindrical guide hole 30 a that is open to the brake shoe 1 side. Be housed.

The torque pin 4 is formed by forming a cylindrical thick portion 4b on the cylindrical portion 4a, and is housed in the guide hole 30a of the torque receiving body 30 from the cylindrical portion 4a side. A flange 4c is projectingly provided at the end of the thick portion 4b of the torque pin 4, and this flange 4c engages with a step 11a formed on the brake shoe guide 11, and the torque pin 4 is restrained via the brake shoe guide 11. Support the bicycle 1. The flange 4c restricts the displacement of the brake shoe guide 11 toward the brake shoe 1 side.

A through hole 32 is coaxially provided toward the outside of the torque receiving body 30 in the bottom portion of the guide hole 30 a formed in the torque receiving body 30 facing the brake shoe 1. A counterbore 31 having a predetermined depth is formed coaxially with the through hole 32. A rod 42 having a flange with an outer diameter larger than the inner diameter of the through hole 32 projects from the through hole 32 toward the inside of the guide hole 30a. The proximal end of the rod 42 provided with a flange is restricted in axial displacement by a retaining ring 43 that is locked to the counterbore 31 of the torque receiving body 30 via a washer 47.

The rod 42 projecting into the guide hole 30a of the torque receiving body 30 has a predetermined end portion that does not contact the inner circumference of the thick portion 4b at the most contracted position of the torque pin 4 (position in FIG. 3). The rod 42 is fitted to the inner circumference of the housing 44 formed of a cylindrical member.

The outer periphery of the housing 44 is formed of a plurality of outer diameters, and a flange 44d that is in sliding contact with the inner periphery of the cylindrical portion 4a of the torque pin 4 is formed at the end portion on the thick portion 4b side, while the torque is A small diameter portion 44e having a predetermined outer diameter is formed in the predetermined axial direction from the other end of the receiving body 30.

The inner periphery of the housing 44 is formed with a through hole 44a fitted to the rod 42 from the end surface of the torque receiving body 30 to a predetermined axial position, while having a predetermined depth from the end surface on the flange 44d side. A counterbore portion 44f is formed on the inner circumference, and a cylindrical portion 44c is formed between the through hole 44a and the inner peripheral end portion of the counterbore portion 44f. Then, the inner diameter of the cylindrical portion 44c is set to a predetermined value that is larger than the through hole 44a and smaller than the inner diameter of the spot facing portion 44f.

A cylindrical friction spring 48 fitted to the rod 42 is housed in the inner periphery of the cylindrical portion 44c, and the housing 44 has a stepped portion 44b formed between the through hole 44a and the cylindrical portion 44c. While the displacement to the brake shoe 1 side is regulated by, the lower end of the cylindrical color 45 fitted to the inner periphery of the cylindrical portion 44c contacts the lower end of the friction spring 48, and the lower end of the counterbore portion 44f. The housing 44 is restrained from being displaced upward in the drawing by contacting the annular washer 46 penetrating the rod 42 through the retaining ring 43 which is locked, and the housing 44 is fixed to the guide hole 30a of the torque receiving body 30. It is fixed coaxially with the rod 42 at the inner circumference.

An annular spring receiver 41 is locked at a predetermined position on the inner circumference of the torque pin 4, that is, on the inner circumference of the cylindrical portion 4 a via a retaining ring 49, and the inner circumference of the spring receiver 41 has a torque pin 4 Is slidably contacted with the small diameter portion 44e of the housing 44.

A spring 40 as an elastic member is provided coaxially with the torque pin 4 between the spring receiver 41 and the flange 44d of the housing 44, and the torque pin 4 is directed toward the torque receiver main body 30, that is, the disc. Energize in the direction away from 2. The spring 40 is set to a predetermined value which is sufficiently larger than the spring constant of the spring 54 which biases the piston 5 toward the brake shoe 1.

A lubricating oil (not shown) is filled in the inner circumference of the guide hole 30a of the torque receiving body 30 to lubricate the sliding surface between the torque pin 4 and the guide hole 30a. A boot 61 for preventing foreign matter from entering is provided between the outer periphery of the end of the torque pin 4 and the torque receiving body 30.

With the above-mentioned configuration, the operation will be described.

When hydraulic pressure is supplied to the oil chamber 50 from a control valve (not shown), braking is started. The piston 5 extends toward the brake shoe 1 according to the oil pressure in the oil chamber 50, and the piston 5 presses the brake shoe guide 11 toward the disc 2 via the heat insulating member 53.

With the pressing of the brake shoe guide 11, the stepped portion 11 a of the brake shoe guide 11 pulls the torque pin 4 toward the brake shoe 1 via the flange 4 c. The torque pin 4 displaces one end of the spring 40 to the brake shoe 1 side via the spring receiver 41, while the other end of the spring 40 is locked to the torque receiver main body 30 via the friction spring 48 fitted to the rod 42. Since the displacement of the housing 44 toward the brake shoe 1 is restricted by the flange 44d of the housing 44, the spring 40 is compressed.

Then, the hydraulic pressure applied to the oil chamber 50 displaces the piston 5 against the spring 40 that biases the torque pin 4.

As the piston 5 extends, the brake shoe guide 11 pushes the brake shoe 1 against the disc 2 while pulling the torque pin 4 to perform braking.

The brake shoe 1 receives a brake torque due to braking, but the torque pin 4 supporting the brake shoe 1 via the brake shoe guide 11 is slidably supported on the inner circumference of the torque receiving body 30 over almost the entire circumference. Therefore, a large amount of brake torque can be supported.

On the other hand, when a control valve (not shown) is connected to the tank and the oil pressure in the oil chamber 50 is released and the braking is released, the spring 54 that urges the piston 5 toward the brake shoe 1 is the spring of the spring 40. Since it is set sufficiently smaller than the constant, the elasticity of the spring 40 causes the torque pin 4 to contract.

With the contraction of the torque pin 4, the brake shoe guide 11 is displaced toward the torque receiving body 30 via the flange 4c and the stepped portion 11a, and the torque pin 4 has an end surface of the cylindrical portion 4a inside the torque receiving body 30. Since the brake shoe 1 supported by the brake shoe guide 11 is displaced to the most contracted position where it comes into contact with the circumference, the brake shoe 1 can be smoothly displaced to a predetermined standby position having a predetermined distance from the disc 2.

The contraction of the torque pin 4 is performed by the elasticity of the spring 40 arranged coaxially, so that the torque pin 4 is not twisted with respect to the guide hole 30 a of the torque receiving body 30, and is smoothly performed.

FIG. 4 shows another embodiment in which a recess 30b having a predetermined depth is formed in the guide hole 30a in the first embodiment, and a bush 70 having a predetermined inner diameter is fixed to the recess 30b. The other configurations are similar to those of the first embodiment.

Since the torque pin 4 is slidably supported on the inner circumference of the bush 70, the torque pin 4 can be smoothly expanded and contracted without using lubricating oil or the like, and maintenance work is performed without the need for lubricating oil supply work. It is possible to improve the sex.

[0035]

[Effect of device]

 As described above, according to the present invention, the elastic member disposed coaxially with the guide member for supporting the brake shoe is used to restore the brake shoe when the brake is released, so that the guide member can be smoothly expanded and contracted without prying. By doing so, the brake shoe can be reliably returned, and since the elastic member and the guide member are coaxially provided, the number of parts can be reduced compared to the conventional case, and the weight reduction can be promoted. .

[Brief description of drawings]

FIG. 1 is a front view showing an embodiment of the present invention.

FIG. 2 is a sectional view taken along line AA of FIG.

FIG. 3 is an enlarged view showing a returning mechanism and a piston.

FIG. 4 is a sectional view of a returning mechanism and a piston according to another embodiment.

[Explanation of symbols]

 1 brake shoe 2 disk 3 caliper body 4 torque pin 10 support frame 11 brake shoe guide 30 torque receiving body 40 spring

Claims (1)

[Scope of utility model registration request] 1. A piston for pressing a brake shoe according to a fluid pressure against a disk that rotates integrally with an axle, and a caliper body fixedly mounted on the trolley side, in which the piston is slidably accommodated. In a braking device for a railway vehicle provided with, while supporting the brake shoe by a guide member, the guide member is accommodated slidably in an axle direction by a torque receiving body fixed at a predetermined position of the caliper body, An elastic member for urging the guide member away from the disc is interposed between the torque receiving main body and the guide member, and the elastic member is arranged coaxially with the guide member. Railway vehicle braking system.