JP4008517B2 - Disc brakes for railway vehicles - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a disc brake for a railway vehicle in which the rigidity of a brake caliper is increased.
[0002]
[Prior art]
In a railway vehicle disc brake, a brake pad attached to a bifurcated fork portion of a brake caliper is pushed by a hydraulic cylinder, and a disc rotor is clamped from both sides to apply a brake.
[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 tips of the forks supporting the brake pad is separated. When the brake caliper is deformed and the interval is increased, the stroke of the hydraulic cylinder increases and the amount of oil also increases. In addition, the brake pads are unevenly contacted and uneven wear occurs, resulting in unstable braking characteristics. Normally, the brake caliper has a sufficiently high rigidity so that such a problem does not occur.
[0004]
[Problems to be solved by the invention]
However, if the thickness of the brake caliper is increased to increase the rigidity of the brake caliper, the overall weight increases and the cost is increased.
[0005]
In order to solve such a problem, the present invention uses a pin that supports the brake caliper in a floating manner to restrain the deformation of the brake caliper so that the rigidity can be increased without taking extra thickness.
[0006]
[Means for Solving the Problems]
The present invention is a brake in which a brake caliper is integrally formed into a substantially H-shaped shape having a bifurcated fork portion and a bifurcated bracket portion on the opposite side, and a disc rotor provided on a part of a wheel is clamped from both sides. A pad is attached to each fork part, and a vehicle body side support frame is disposed between the bracket parts, and at least a pair of support pins are inserted between the bracket parts, and a brake is applied to the vehicle body side support frame in the direction of the disc rotor rotation axis. In the disc brake in which the caliper is slidably supported so as to be slidable , the support pin is provided with restraining means for preventing deformation in a direction in which the interval between both bracket portions is narrowed, and the restraining means is provided on the support pin via the support hole. The movement of the pair of brackets inserted in the direction in which the distance between each other is reduced is prevented by locking at least a part of the support pin. Including a stepped sleeve.
[0008]
[Action / Effect]
During braking, a reaction force is applied in the direction in which the distance between the forks of the brake caliper is increased, whereby a stress is applied so that the distance between the brackets becomes narrower. However, since the support pin receives this stress through the restraining means fitted to the support pin and prevents the bracket portion from being deformed in the direction in which the interval between the bracket portions is narrowed, the brake caliper fork portion can be prevented from being deformed. Even if it does not take extra wall thickness, the rigidity can be increased, the increase in weight can be suppressed, and the cost can be reduced.
[0009]
DETAILED DESCRIPTION OF THE INVENTION
An embodiment of the present invention will be described with reference to FIGS.
[0010]
1 and 2, reference numeral 1 denotes a disk rotor provided on a part of a wheel. Brake pads 3A and 3B attached to a bifurcated fork portion 4 of a brake caliper 2 located on both sides of the disk rotor 1 are arranged. Established. Among them, the brake pad 3A is pressed by a hydraulic cylinder 5 built in one of the fork portions 4 of the brake caliper 2, and holds the disc rotor 1 with the brake pad 3B during braking.
[0011]
A bifurcated bracket portion 9 is also integrally formed on the opposite side of the fork portion 8 of the brake caliper 2, and a vehicle body support frame 7 fixed to the vehicle body side by the bracket portion 9 is sandwiched from both sides. A pair of support pins 6 arranged vertically at predetermined intervals penetrates the vehicle body support frame 7 and supports the brake caliper 2 slidably with respect to the vehicle body support frame 7 in the direction of the rotation axis of the disk rotor 1. Floating support is performed so that the brake pads 3 </ b> A and 3 </ b> B always come into contact with both sides of the disk rotor 1 with equal pressure during the operation of 5.
[0012]
Although the brake caliper 2 has an overall H-shape, the fork portion 4 of the brake caliper 2 has a stress in a direction in which the distance between the tips of the fork portion 4 increases due to the reaction force of the hydraulic cylinder 5 during braking. With this deformation, the bracket portion 9 tends to narrow the tip interval.
[0013]
In order to prevent such deformation at the time of braking, as shown in FIG. 3, the support pin 6 extending in the rotation axis direction of the disk rotor 1 disposed in the bracket portion 9 is first formed with a collar portion 6A at the tip portion. In addition, a stepped sleeve 11 having a step on the outer periphery is fitted from the opposite side, and one bracket portion 9 is inserted into the stepped sleeve 11 through a support hole 12, and a bag is formed from the front end side of the stepped sleeve 11. The nut 13 is screwed and tightened until it abuts against the end face of the support bolt 6, and the bracket portion 9 is sandwiched between the cap nut 13 and the stepped portion 11 </ b> A of the stepped sleeve 11.
[0014]
Further, a stepped portion 6B having a small diameter is formed at the other end of the support pin 6, and after the retaining ring 14 is inserted into the stepped projection 6B, the other bracket portion 9 is inserted through the support hole 12. Further, a stepped sleeve 15 that partially fits into the support hole 12 is inserted, the bracket portion 9 is sandwiched between the stepped portion 15A of the stepped sleeve 15 and the retaining ring 14, and the stepped sleeve 15 A nut 16 that is screwed onto the end portion of the support pin 6 is tightened from the outside, thereby holding the bracket portion 9 so as not to be deformed inward.
[0015]
It is to be noted that the vehicle body support frame 7 is inserted through the through hole 7A at a position between the bracket portions 9 and a boot 18 is interposed in the gap between the vehicle body support frame 7 and the bracket portion 9. The sliding surface is dustproof.
[0016]
The configuration is as described above. Next, the operation will be described.
[0017]
When the hydraulic cylinder 5 built in the brake caliper 2 is operated, the disc 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 separated from each other by this braking reaction force. Stress is applied in the direction of expanding. Thus, due to the stress acting on the fork portion 4, each bracket portion 9 on the extension of each fork portion 4 tends to be deformed in the direction of narrowing the interval.
[0018]
That is, in FIG. 2, the bracket portion 9 tends to be deformed inward along the support pins 6 arranged above and below, but as shown in FIG. 3, of the pair of bracket portions 9, As for the front end side, the cap nut 13 screwed from the front end side of the stepped sleeve 11 is tightened until it abuts against the end face of the support bolt 6, thereby providing a bracket between the cap nut 13 and the stepped portion 11 </ b> A of the stepped sleeve 11. The inner surface of the cap nut 13 is brought into contact with the end surface of the support pin 6 while holding the portion 9, so that the reaction force is applied to the support pin 6 (along the support pin 6 of the bracket portion 9). The bracket portion 9 is sandwiched between the retaining ring 14 and the stepped sleeve 15 that are locked to the stepped protrusion 6B on the base end side of the support pin 6, and the support pin 6 is N screwed into 6 The preparative 16 by tightening the stepped sleeve 15, prevents the same deformation of the bracket portion 9.
[0019]
As a result, the outward deformation due to the braking reaction force of the fork portion 4 is prevented by the support pins 6 preventing the deformation toward the inside of the pair of bracket portions 9 located substantially on the extension thereof. Is done. 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 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. .
[0020]
Further, if the deformation of the brake caliper 2 is prevented such that the distance between the fork portions 4 is increased during braking, the braking stroke of the hydraulic cylinder 5 can be made 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 the support pin portion.
[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 (1)

The brake caliper is integrated into a roughly H-shaped configuration with a bifurcated fork part and a bifurcated bracket part on the opposite side, and each brake pad for holding a disc rotor provided on a part of the wheel from both sides. The vehicle body side support frame is disposed between the bracket portions, and at least a pair of support pins are inserted between these brackets, and the brake caliper slides in the direction of the disc rotor rotation axis with respect to the vehicle body side support frame. In the railway vehicle disc brake that is floating-supported in a possible manner, the support pin is provided with restraining means for preventing deformation in a direction in which the interval between both bracket portions is narrowed, and the restraining means is provided on the support pin via a through hole. The pair of inserted brackets are prevented from moving in the direction in which the distance between them is reduced by locking at least part of the support pin. Disc brake for a railway vehicle, characterized in that it comprises a stepped sleeve.

Images