JPS6157500B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an improvement in a caliper guide mechanism for a pin type disc brake.

In a pin type disc brake, for example, a guide pin is fixed to a support extending from a fixed part of the vehicle body to the edge of the disc, and an opening of a caliper arranged to straddle the edge of the disc is in a sliding relationship with the guide pin. In order to support the caliper so that it can move in the disk axial direction, and to seal the sliding part where the opening and the guide pin are fitted from the outside air, the outer periphery of the guide pin is removed from the edge of the opening. It is common for the boots to be covered over the entire length of the boot.

In a disc brake having such a caliper guide mechanism, when the wear of the friction pad reaches its limit, it is possible to replace it without having to remove or attach the boot, thereby preventing forgetting to assemble it later. There are models available that solve the problem. However, in this type of model, it is normal for the sliding part to continue to be sealed by the boot, including when replacing the friction pad, but during this replacement work, the opening and guide pin are repositioned in the axial direction. During this process, the volume of the void inside the boot or the opening changes rapidly, creating unnecessary air pressure within the void. It is desirable to release the seal within the boot. Therefore, in the present invention, in addition to improving the workability of attaching and detaching the caliper guide mechanism, it is also possible to automatically temporarily release the seal from the outside air inside the boot.

The present invention will be described in detail below based on embodiments shown in the drawings.

In FIGS. 1 to 3, 1 is a support fixedly disposed on the edge of a disk (not shown); 2
3 is a through hole formed in this support 1, 3 is a boss portion of a caliper that is supported movably in the disk axial direction with respect to this support 1, and a guide pin 5 is inserted into an opening 4 that is open at one end. They are assembled in a mating relationship. This guide pin 5
A screw hole 7 is formed in a head 6 at the tip that protrudes from the opening 4, and a large diameter flange 8 is formed slightly inside the head 6. The guide pin 5 has a threaded end portion 10 of the bolt 9 inserted through the through hole 2 of the support 1.
By screwing into the screw hole 7 of the guide pin 5, it is fastened and fixed to the support 1 with a hollow annular rigid cover 11, which will be described below, sandwiched therebetween.

The hollow annular rigid cover 11 has a hole 13 formed on the top surface of the protrusion with a convex cross section, into which the bolt 9 is inserted, and the protrusion 12 has a hexagonal guide pin 5 as shown in FIG. It is formed in a hexagonal shape corresponding to the head 6, and is provided so that rotation thereof is restricted relative to each other by fitting together. Further, the bottom portion 14 having a large-diameter disk shape is provided so as to face the large-diameter flange portion 8 of the guide pin 5 with a constant gap l when the guide pin 5 is fastened and fixed to the support 1. There is. Further, a radial protrusion 15 is formed on the bottom portion 14, and the protrusion 15 engages with a recess (not shown) formed in the support 1 to prevent rotation.

Reference numeral 16 denotes a bellows-like cylindrical boot that seals the sliding portion of the opening 4 and the guide pin 5 from the outside air, and its one end enlarged portion 17 is assembled and fixed to the periphery of the opening 4 of the carrier boss portion 3 by a retainer 19. The enlarged portion 18 at the other end is located between the bottom portion 14 of the rigid cover 11 and the large diameter flange portion 8 of the guide pin 5. In its natural state, the enlarged portion 18 at the other end has a width larger than the constant gap l between the bottom portion 14 of the rigid cover 11 and the large diameter flange portion 8 of the guide pin 5, and is connected to the support 1 of the guide pin 5. is provided so as to be compressed by fastening and fixing to form a seal with the large diameter flange portion 8,
In this example, one end of the boot 16 has an expanded portion 18.
is attached to the bottom 14 of the rigid cover 11.

According to the above configuration, when attaching and detaching the guide pin 5 to and from the support 1, the rigid cover 11 is prevented from rotating by the support 1, and the relative rotation of the guide pin 5 with respect to the rigid cover 11 is restricted. Therefore, this can be done only by screwing in and out the bolt 9. Moreover, when the guide pin 5 is fastened and fixed to the support 1, the enlarged part 18 at one end of the boot 16 is connected to the large diameter flange part 8 of the guide pin 5. and the bottom part 14 of the rigid cover 11 to seal the inside of the boot 16 from the outside air, and when the fastening is released, the sealing is automatically released.
The above-mentioned intended purpose is fully achieved. FIG. 2 shows a state in which the guide pin 5 is released, and in this example, since the boot 16 and the rigid cover 11 are connected, there is no risk of them falling off during work.

FIG. 4 shows another embodiment, and this embodiment has the same structure as the previous embodiment except that the rigid cover 11' is assembled in a different manner. The assembled state of the rigid cover 11' is such that the bottom part 14' is in contact with the support 1.
This has the advantage that the shape of the detent is easier to form.

As described above, the pin type disc brake caliper guide mechanism according to the present invention has extremely superior effects compared to conventional ones.
The benefits are great.

[Brief explanation of the drawing]

The drawings all show embodiments of the present invention, and FIG. 1 is a front view including a partial cross section of the caliper guide mechanism, and FIG. 2 is a diagram showing a state in which the guide pin in the caliper guide mechanism is released. , FIG. 3 is a sectional view taken along the line A-A in FIG. 1, and FIG. 4 is a front view including a partial sectional view of a caliper guide mechanism showing another embodiment. DESCRIPTION OF SYMBOLS 1... Support, 2... Through hole, 3... Boss part, 4... Opening, 5... Guide pin, 6... Head, 7... Screw hole, 8... Large diameter flange part, 9...
... Bolt, 10 ... Thread part, 11 ... Rigid cover, 12 ... Protrusion, 13 ... Hole, 14 ... Bottom,
15...protrusion, 16...boots, 17,18...
One end is the ampulla, 19...retainer.

Claims (1)

[Scope of Claims] 1. A guide pin is fastened to one side of a caliper arranged to straddle the edge of the disk and a support extending from the vehicle body fixing part to the edge of the disk by screwing a bolt. The other caliper or support is formed with an opening that is in a sliding relationship with the guide pin, and the boot covers the edge of the opening and the outer periphery of the guide pin, so that the sliding part is exposed to the outside air. In the caliper guide mechanism of a pin type disc brake sealed from the inside, the guide pin is held between one of the caliper or the support to which the guide pin is fastened and fixed, and the guide pin, and A hollow annular rigid cover that prevents rotation is inserted, and a flange is formed on the outer periphery of the guide pin to face the periphery of the rigid cover, and one end of the boot is attached to the rigid cover when the guide pin is fastened. A caliper guide mechanism for a pin type disc brake, characterized in that the caliper guide mechanism for a pin type disc brake is configured so that the sliding portion is sealed by being pressed between the peripheral edge of the guide pin and the flange of the guide pin. 2. The caliper guide mechanism for a pin type disc brake according to claim 1, wherein one end of the boot and the peripheral edge of the rigid cover are connected.