JPS6357650B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to improvements in disc brakes for vehicles, particularly pin slide type disc brakes.

The disc has a fluid actuator on one side and a caliper having a hanging limb on the other side. This caliper is slidably supported on a pin protruding from a fixed part of the vehicle body, and the movement of the caliper in the axial direction of the disc is caused by the pin when braking. Pin slide type disc brakes with sliding guidance have been known for a long time.

FIG. 1 shows an example of this conventional pin slide type disc brake, in which a caliper 12 that integrally has a fluid actuator 11 disposed on one side of a disc 10 has ears 13 and 14 at both ends.
has. 15 is a mounting fixed to a stationary part of the vehicle body. The mounting 15 slidably supports an inner pad 16 disposed on one side of the disk 10 and an outer pad 17 disposed on the other side, and receives braking torque generated on both pads during braking. A pair of pins 18 and 19 of the same support structure are screwed onto the mounting 15. To explain only one pin 18, an elastic member 2 is provided in the opening 20 of the caliper ear 13.
1 is fixedly installed, and a pin 18 passes through the opening 22 of the elastic member 21.

When the fluid actuator 11 is activated, the caliper 1
2 moves away from the disk 10 along with its ears 13 and 14 in the axial direction of the disk, and is guided by pins 18 and 19. That is, the caliper ear 13 moves along with the elastic member 21 on the pin 18 in the disk axial direction.

The elastic member 21 is made of resin or rubber, and the purpose of inserting and fixing the elastic member 21 is to prevent or buffer vibration of the caliper. This anti-vibration effect makes it possible to prevent abnormal noises and pin breakage. However, the disadvantage of such an elastic member 21 is that the outer peripheral surface of the pin is exposed to the outside air, and as both pads 16 and 17 wear, the caliper ears 13 and 14
The pin moves in a direction away from the disk 10 and reaches a resting position, but there is a good possibility that rust has formed on the outer circumferential surface of the pin due to exposure to the outside air. Therefore, there is a possibility that the caliper 12 will not move in the axial direction during braking due to this pin rusting. Also, because the pins are exposed to the outside air, mud and other substances may adhere to them.
This also becomes a cause of inhibiting the sliding movement of the caliper.

On the other hand, in order to eliminate such drawbacks, the second
Structures such as those shown have also been conventionally provided. In FIG. 2, the pin 23 is screwed into the mounting 24 at one end, one bead portion 26 of the first boot 25 is fitted onto the outer peripheral surface of the pin 23, and the other bead portion 27 is fitted onto the caliper ear. It is fitted into the groove of 28. Similarly, one bead portion 27' of the second boot 25' fits onto the outer peripheral surface of the pin 23, and the other bead portion 26' fits into the groove of the caliper ear 28.

According to such a configuration, the sliding guide portion of the pin 23 relative to the caliper ear portion 28 is shielded from the outside air, thereby eliminating the possibility of sliding failure due to rust or mud adhesion. However, flexible boots 2
5, 25', the anti-vibration effect cannot be expected, and pin 23
The rattling of the caliper ears 28 may cause abnormal noises, damage to the pins 23, or damage to the boots 2.
5.5, 25' fatigue fatigue may occur. Furthermore, there is a risk that the boot 25' in particular may be damaged by flying stones or the like while the vehicle is running.

Therefore, the present invention aims to eliminate the above-mentioned drawbacks of conventional pin slide type disc brakes, and provides a pin slide type disc brake that has excellent vibration resistance and is free from the risk of rusting, mud adhesion, etc. It is.

Examples of the present invention will be described below.

In FIG. 3, the pin 32 has one end 30 threaded and is fixed at the one end 30 to a mounting 33 fixed to a stationary part of the vehicle body (not shown). 3
Reference numeral 4 denotes an ear portion of the caliper, which has an opening 35, an annular groove 36, and a recess 37.

A rubber boot 38 is arranged between the mounting 33 and the caliper ear 34. That is,
The first bead portion 39 of the boot 38 is fitted into the annular groove 31 of the pin 32, and the second bead portion 40 is fitted into the annular groove 36 of the caliper ear 34. A vibration-resistant rubber bushing 41 is fitted into the recess 37 of the caliper ear 34. That is, the bush 41 is open at one end and accommodates the pin 32 therein, and its inner wall 42 is slidably in close contact with the outer peripheral surface of the pin 32.

Therefore, the bush 41 is guided by the pin 32 together with the caliper ear 34 and slides on the pin 32. According to this structure, it is possible to provide a pin slide type disc brake that has excellent vibration resistance and also has sufficient rust prevention properties.

When replacing brake pads, if you need to remove the caliper from the mounting, use the button 4.
1 is removed from the bush 41, the first bead 39 of the boot 38 is removed from the pin annular groove 31, and the caliper ear 34 is pulled out from the pin 32. Therefore, there is an effect that the condition of the sliding surface on the outer periphery of the pin 32 (presence of rust or damage) can be inspected and confirmed.

According to the second embodiment of the present invention shown in FIG. 45.

According to this structure, when the pin 32 is to be removed from the mounting 33, only the bottom plug portion 45 needs to be removed from the cylindrical portion 44 of the bush 43. Since the other component configurations are the same as those in the first embodiment, explanations are omitted and only numbers are given in the drawings.

In the third embodiment shown in FIG. 5, a metal collar 46 is fitted to the outer peripheral portion of the pin 32 concentrically with the pin 32. A cylindrical portion 44 of a bushing 43 is fitted into the recess 37 of the caliper ear 34, and the inner circumferential wall of the cylindrical portion 44 is slidable relative to the collar 46. The first bead portion 39 of the boot 38 fits within an annular groove 47 formed on the collar 46.

According to this configuration, even when the pin 32 is removed from the collar 46, the sliding relationship between the collar 46 and the caliper ear 34 is maintained, so that foreign substances such as mud and water will not enter the sliding portion during maintenance. There's no fear.

In the present invention, since a bush with a bottom plug is used, the pin can be easily removed from the vehicle fixing part by simply removing the bottom plug. Therefore,
Work such as parts replacement and inspection becomes easier. or,
Since the bushings are intact, there is little damage during work.

[Brief explanation of the drawing]

Fig. 1 is a partially sectional plan view of an example of a conventional pin slide type disc brake, Fig. 2 is a sectional view of a main part of another example of a conventional pin slide type disc brake, and Fig. 3 is a pin slide according to the present invention. FIG. 4 is a cross-sectional view of the main part of the first embodiment of the type disc brake. FIG. 5 is a cross-sectional view of the main part of the second embodiment of the invention. 32: Pin, 33: Mounting, 34: Caliper, 38: Boots, 41, 43: Butsuyu.

Claims (1)

[Claims] 1. A pin slide type disc brake in which a pair of pins, one end of which is fixed to a mounting that is fixed to a fixed part of the vehicle and slidably supports the inner and outer pads, is slidably supported by the opening in the ear of the caliper. The other end of the pin is a cylinder whose one end side is fitted into the opening of the ear, at least a part of the inner wall of which is slidably in close contact with the outer peripheral surface of the pin, and which is supported by the ear. 1. A pin slide type disc brake, characterized in that the pin slide type disc brake is surrounded by a bush consisting of a shaped part and a bottom plug part that closes the opening bottom on the other end side of the cylindrical part.