JPH1076943A - Disc brake for rolling stock - Google Patents

Abstract

PROBLEM TO BE SOLVED: To constrain deformation of a brake caliper by utilizing a pin to support in a floating state the brake caliper, and to improve rigidity without putting a surplus thickness wall. SOLUTION: Brake pads 3B between which a disc rotor 1 is nipped from both sides are attached to a fork part 1 and a support frame 7 on the car body side is arranged between bracket parts 9. At least a pair of support pins 6 are extended through therebetween and a brake caliper 2 is supported in a floating state. A containing means to block deformation in a direction in which a distance between two bracket parts 9 is decreased is arranged at each of the support pins 6.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a disk brake for a railway vehicle in which the rigidity of a brake caliper is increased.

[0002]

2. Description of the Related Art In a disk brake for a railway vehicle, a brake pad attached to a forked portion of a brake caliper is pressed by a hydraulic cylinder to clamp a disk rotor from both sides to apply braking.

[0003] At this time, a braking reaction force of the hydraulic cylinder acts on the brake caliper in a direction in which the distance between the distal ends of the forks supporting the brake pads is increased. If the brake calipers are deformed and spaced apart, the stroke of the hydraulic cylinder increases and the oil amount also increases. In addition, the brake pads are also unevenly worn, uneven wear occurs, and the braking characteristics become unstable. Normally, the rigidity of the brake caliper is made sufficiently high so that such a problem does not occur.

[0004]

However, if the thickness of the brake caliper is increased to increase the rigidity of the brake caliper, the overall weight is increased and the cost is increased.

In order to solve such a problem, the present invention utilizes a pin for floatingly supporting the brake caliper, restrains the deformation of the brake caliper, and increases the rigidity without taking extra thickness. did.

[0006]

According to the present invention, a brake caliper is integrally formed into a substantially H-shaped shape having a forked fork portion and a forked bracket portion on the side opposite to the fork portion, and a disk rotor is sandwiched from both sides. A brake pad is attached to each fork, while a vehicle-body-side support frame is arranged between the brackets, and at least a pair of support pins penetrate between the brackets. In a disk brake in which a brake caliper is slidably supported in a floating manner, the support pins are provided with restraining means for preventing deformation in a direction in which a distance between both bracket portions is reduced.

[0007] In the present invention, the restraining means includes:
Including a stepped sleeve that locks and prevents at least a part of the support pin from moving in a direction in which the interval between the pair of brackets inserted into the support pin via the support hole is reduced.

[0008]

[Function / Effect] During braking, a reaction force is applied in a direction in which the interval between the fork portions of the brake caliper increases, whereby a stress acts on the bracket portion to narrow the interval. However, the support pin receives this stress via the restraining means fitted to the support pin, and prevents deformation of the bracket in the direction in which the interval between the brackets is reduced, so that deformation of the fork portion of the brake caliper can be prevented. The rigidity can be increased without increasing the wall thickness, the increase in weight can be suppressed, and the cost can be reduced.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described with reference to FIGS.

In FIGS. 1 and 2, reference numeral 1 denotes a disk rotor provided on a part of a wheel, and a forked portion 4 of a brake caliper 2 which is located on both sides of the disk rotor 1.
The brake pads 3A and 3B attached to the vehicle are arranged. The brake pad 3A is pressed by a hydraulic cylinder 5 incorporated in one of the fork portions 4 of the brake caliper 2, and holds the disk rotor 1 with the brake pad 3B during braking.

On the opposite side of the fork portion 8 of the brake caliper 2, a forked bracket portion 9 is also integrally formed so as to protrude therefrom. The vehicle body support frame 7 fixed to the vehicle body by this bracket portion 9 is sandwiched from both sides, and A pair of support pins 6 arranged at predetermined intervals above and below the portion 9 penetrate the vehicle body support frame 7 and support the brake caliper 2 slidably in the rotation axis direction of the disk rotor 1 with respect to the vehicle body support frame 7. When the hydraulic cylinder 5 is operated, floating support is performed so that the brake pads 3A and 3B always come into contact with equal pressure from both sides of the disk rotor 1.

The brake caliper 2 has an H-shape as a whole, but the fork portion 4 of the brake caliper 2 has a direction in which the distance between the leading ends of the fork portion 4 increases due to the reaction force of the hydraulic cylinder 5 during braking. , And the gap between the ends of the bracket portion 9 tends to be narrowed with this deformation.

In order to prevent such deformation during braking,
As shown in FIG. 3, the support pin 6 extending in the direction of the rotation axis of the disk rotor 1 disposed on the bracket 9 has a flange 6A formed at the tip thereof, and has a step on the outer periphery from the opposite side. A stepped sleeve 11 is fitted. One bracket 9 is inserted into the stepped sleeve 11 through a support hole 12, and a cap nut 13 is screwed into the stepped sleeve 11 from the distal end side. Tighten until it touches
The bracket 9 is held between the cap nut 13 and the step 11A of the stepped sleeve 11.

At the other end of the support pin 6, a stepped portion 6B having a small diameter is formed. After the snap ring 14 is inserted into the stepped portion 6B, the other bracket 9 is connected to the support hole 12 with the support hole 12. And a stepped sleeve 15 that partially fits into the support hole 12 is inserted.
The bracket 9 is sandwiched between the 5A and the retaining ring 14, and a nut 16 screwed from the outside of the stepped sleeve 15 to the end of the support pin 6 is tightened so that the bracket 9 is not deformed inward. Hold.

The vehicle body support frame 7 is inserted through the through hole 7A at a position intermediate between these two bracket portions 9, and a boot 18 is provided in a gap between the vehicle body support frame 7 and the bracket portion 9. The dust resistance of the sliding surface is ensured by interposing.

The operation is described below, and the operation will be described below.

When the hydraulic cylinder 5 built in the brake caliper 2 is actuated and the disk rotor 1 is clamped from both sides by the brake pads 3A and 3B and braking is applied, the fork portion 4 of the brake caliper 2 is caused by the braking reaction force. Stress is applied in a direction to increase the distance between each other. Thus, the stress acting on the fork portions 4 tends to cause deformation of the bracket portions 9 on the extension of each of the fork portions 4 in a direction in which the intervals are reduced.

That is, in FIG. 2, the bracket 9 tries to deform inward along the vertically arranged support pins 6, but as shown in FIG. On the tip end side of the pin 6, the cap nut 13 screwed from the tip end side of the stepped sleeve 11 is tightened until it comes into contact with the end face of the support bolt 6, so that the cap nut 13 and the stepped portion 11 </ b> A of the stepped sleeve 11 are connected. The bracket 9 is sandwiched between the brackets 9 and the inner surface of the cap nut 13 abuts on the end face of the support pin 6, so that a reaction force is applied to the support pin 6 and the bracket 9 is moved along the support pin 6 (vehicle support). The ring 14 prevents deformation (in the direction of the frame 7) and, on the proximal end side of the support pin 6, engages with the step ring 6B.
The bracket section 9 is sandwiched between the bracket section 9 and the stepped sleeve 15, and the stepped sleeve 15 is tightened by a nut 16 screwed to the support pin 6, thereby preventing the bracket section 9 from being similarly deformed.

As a result, the outward deformation of the fork portion 4 due to the braking reaction force is prevented by the support pin 6 from the inward deformation of the pair of bracket portions 9 which are located substantially on these extensions. It is prevented by that. That is, the rigidity of the brake caliper 2 is increased by using the support pins 6. In this way, since the support pin 6 receives the stress based on the braking reaction force, it is not necessary to increase the thickness of the brake caliper 2 to increase the rigidity of the brake caliper 2 and the weight of the brake caliper 2 can be reduced. .

Further, when the deformation of the brake caliper 2 such that the interval between the fork portions 4 is increased during braking is prevented,
The braking stroke of the hydraulic cylinder 5 is constant, and uneven wear of the brake pads 3A and 3B can be prevented.

[Brief description of the drawings]

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

FIG. 2 is a plan view of the same.

FIG. 3 is a sectional view of a portion of a support pin.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Disc rotor 2 Brake caliper 3A, 3B Brake pad 4 Fork part 5 Hydraulic cylinder 6 Support pin 9 Bracket part 11 Stepped sleeve 13 Cap nut 15 Stepped sleeve 16 Nut

Claims (2)

[Claims] A brake caliper is integrally formed in a substantially H-shape having a forked portion and a forked bracket portion on the opposite side thereof, and a brake pad for sandwiching a disk rotor from both sides is attached to each fork portion. On the other hand, a vehicle body-side support frame is arranged between the bracket portions, and at least a pair of support pins penetrates between the bracket portions, and a brake caliper is slidably movable in the disk rotor rotation axis direction with respect to the vehicle body-side support frame. A railway vehicle disc brake, wherein the support pin is provided with restraining means for preventing deformation in a direction in which a distance between both bracket portions is reduced. 2. A stepped step in which the restraining means stops at least a part of the support pin from moving in a direction in which a gap between the pair of brackets inserted into the support pin through the through hole is reduced. The railway vehicle disc brake according to claim 1, further comprising a sleeve.