JPH02507Y2 - - Google Patents

Description

[Detailed description of the invention] The invention is based on a pin slide type disc brake, in particular, a pair of annular grooves formed in each support hole of a pair of arms provided in a movable caliper, and an outer end seal part of an inner boot and an inner part of an outer boot. The end seal portions are respectively fitted, and a cylindrical guide pin is fitted into both boots and the support hole so as to be slidable in the axial direction, and the outer boot is inserted into an annular groove formed on the outer periphery of the outer end of the guide pin. An annular retainer is disposed on the inner end of the guide pin via a compression spring that fits the outer end seal portion and locks the outer end inside the outer end seal portion of the inner boot, and the outer periphery of this retainer The inner end seal portion of the inner boot is fitted into the annular groove formed in the inner boot, and these are assembled to the torque member using bolts inserted into the retainer and guide pin, so that the retainer and guide pin abut and The present invention relates to an inner boot in a pin slide type disc brake in which a movable caliper is slidable in the axial direction on the guide pin and is urged outward by the compression spring.

Conventionally, the inner boot in the above-mentioned type of disc brake has a simple ring shape in which the inner end (left end in the figure) of the seal portion 1a is fitted into the annular groove 2a of the retainer 2, as shown in FIG. It was hot. For this reason, each support hole 3 of a pair of arms 3 (only one is shown) provided on the movable caliper
The outer end seal portion 1b of the inner boot 1 and the outer boot 4 are inserted into the pair of inner and outer annular grooves 3b and 3c formed in the outer boot 4.
A cylindrical guide pin 5 is fitted into the boots 1, 4 and the support hole 3a so as to be slidable in the axial direction. The outer end seal portion 4b of the outer boot 5 is fitted into the formed annular groove 5a, and the outer end of the guide pin 5 is inserted through a compression spring 6 that locks the outer end inside the outer end seal portion 1b of the inner boot 1. When the annular retainer 2 is disposed and the inner end seal portion 1a of the inner boot 1 is fitted into the annular groove 2a formed on the outer periphery of the retainer 2 (temporarily assembled state), if you release your hand from the retainer 2. , the retainer 2 is pushed inward (to the left in the figure) by the spring 6, and the inner end seal portion 1a of the inner boot 1 expands around the corner A of the annular groove 2a in the retainer 2 as a fulcrum, as shown in the figure, to form the annular groove 2a. When the retainer 2 and the spring 6 were attached to the torque member 8 using the bolts 7, the retainer 2 and the spring 6 sometimes fell off. As a means to deal with this problem, the thickness of the inner end seal portion 1a of the inner boot 1 may be increased or the tightness relative to the annular groove 2a may be increased to improve the inner end seal portion 1a.
Possible methods include increasing the tightening force against the annular groove 2a, or adding a clip, band, etc. to the outer periphery of the inner end seal 1a, but if the former method is adopted, the inner end seal 1a Annular groove 2a
If the latter method is adopted, the number of parts will increase and the number of parts will increase.
Costs are forced to rise due to increased assembly man-hours.

The present invention was devised in view of these circumstances, and its purpose is to solve the above-mentioned problems without impeding assemblability and without increasing costs by devising the shape of the inner end seal portion of the inner boot. It's about doing. In order to achieve such an object, in the present invention, a ring groove is provided at the outer end of the inner end sealing part of the inner boot, and extends in the axial direction from the bellows part of the inner boot, and extends from the annular groove of the retainer. A protruding portion having a wall thickness thicker than the bellows portion that abuts the outer circumferential surface located on the outside is integrally formed.

According to this configuration, even if the retainer is removed from the retainer in the above-mentioned temporarily assembled state, the protruding portion serves as a sufficiently rigid protrusion, and the inner inner part with the corner of the annular groove in the retainer as a fulcrum is supported. The inner end seal part of the inner boot is prevented from expanding and the inner end seal part of the inner boot is prevented from coming off from the annular groove of the retainer. In addition, since the raised portion is integrally formed on the outer end of the inner end seal portion of the inner boot, there is no cost increase due to an increase in the number of parts or an increase in assembly man-hours. The inner end seal portion of the inner boot does not need to be expanded when fitting into the annular groove of the retainer, and does not impede assemblability.

An embodiment of the present invention will be described below based on the drawings. FIG. 1 shows a pin slide type disc brake employing an inner boot according to the present invention, in which a torque member 11 is formed in a shape that straddles a disc rotor (not shown), and an inner pad 12 and an outer pad 13.
is supported. This torque member 11 has a pair of mutually parallel guide pins 14 (see Fig. 2).
are assembled, and a movable caliper 15 is attached to the pair of arms 15 on both guide pins 14.
It is assembled so as to be slidable in the axial direction at points a and 15a.

However, in this disc brake,
As shown in FIG. 2, each support hole 1 of each arm 15a in the movable caliper 15 is similar to the conventional case.
A pair of inner and outer annular grooves 15c and 15d formed in 5b.
The outer end seal portion 16a of the inner boot 16 and the inner end seal portion 17a of the outer boot 17 are respectively fitted into the inner boot 16 and the support hole 15.
A cylindrical guide pin 14 is fitted into the guide pin 14 so as to be slidable in the axial direction, and the outer end seal portion 17b of the outer boot 17 is fitted into the annular groove 14a formed on the outer periphery of the outer end of the guide pin 14. Attach the outer end to the inner end of the pin 14 and the outer end seal portion 16b of the inner boot 16.
An annular retainer 19 is disposed via a compression spring 18 that locks inside, and the inner end seal portion 16b of the inner boot 16 is fitted into an annular groove 19a formed on the outer periphery of the retainer 19 (temporarily assembled state (not shown)). state), the above-mentioned members are assembled by being assembled to the torque member 11 with the bolts 20 inserted into the retainer 19 and the guide pin 14, and in the assembled state, the retainer 19
The movable caliper 15 is allowed to slide in the axial direction on the guide pin 14 and is urged outward by the spring 18. Therefore, with this disc brake, the movable caliper 15 is returned to a predetermined position when the brake is released, thereby preventing so-called brake drag.

By the way, in this embodiment, as shown in FIGS. 2 and 3, at the outer end of the inner end seal portion 16b of the inner boot 16, there is a groove extending in the axial direction and located on the inner periphery of the bellows portion 16d. The raised portion 16 is thicker than the bellows portion 16d that comes into contact with the outer circumferential surface 19b of the retainer 19 located outward from the annular groove 19a.
c is integrally formed. Therefore, even if you take your hand off the retainer 19 in the temporarily assembled state described above,
The inner end seal portion 16 of the inner boot 16 has the raised portion 16c as a sufficiently rigid protrusion and uses the corner A of the annular groove 19a of the retainer 19 as a fulcrum.
This prevents the inner end seal portion 16b of the inner boot 16 from coming off the annular groove 19a of the retainer 19. Further, since the raised portion 16c is integrally formed on the outer end of the inner end seal portion 16b of the inner boot 16, there is no increase in cost due to an increase in the number of parts or an increase in assembly man-hours, etc., and the raised portion 16c The annular groove 1 in the retainer 19 of the inner end seal portion 16b of the inner boot 16 has a shape that comes into contact with the outer circumferential surface 19b located outward from the annular groove 19a of the retainer 19.
When fitting into the inside of the retainer 9a, the left end of the inner end seal part 16b as shown in the figure can be widened and the raised part 16c can be fitted along the outer circumferential surface 19b of the retainer 19, so there is almost no need to widen the raised part 16c. , does not hinder assembly.

In the above embodiment, the raised part is formed in an annular shape, but the raised part has a shape that functions as a sufficiently rigid protrusion in the temporarily assembled state, that is, it is located on the inner periphery of the bellows part of the inner boot. The shape may be thicker than the bellows portion extending in the axial direction and abutting the outer circumferential surface of the retainer located outward from the annular groove, and is not limited to the shape of the above embodiment.

[Brief explanation of drawings]

Figure 1 is a front view of a pin slide type disc brake that uses an inner boot according to the present invention.
FIG. 2 is a partially enlarged cross-sectional view of the disc brake in the assembly process, FIG. 3 is an enlarged cross-sectional view of the main part, and FIG. 4 is a partially enlarged cross-sectional view of the conventional pin slide type disc brake in the assembly process. Explanation of symbols, 11... Torque member, 14...
Guide pin, 14a... annular groove, 15... movable caliper, 15a... arm, 15b... support hole,
15c, 15d...Annular groove, 16...Inner boot, 16a...Outer end seal part, 16b...Inner end seal part, 16c...Protuberance, 16d...Bronze part,
17... Outer boot, 17a... Inner end seal portion, 17b... Outer end seal portion, 18... Compression spring, 19... Retainer, 19a... Annular groove,
19b...Outer peripheral surface, 20...Bolt.

Claims (1)

[Scope of utility model registration request] The outer end seal portion of the inner boot and the inner end seal portion of the outer boot are respectively fitted into a pair of inner and outer annular grooves formed in each support hole of a pair of arms provided in the movable caliper, and the outer end seal portion of the inner boot and the inner end seal portion of the outer boot are fitted into the respective support holes of the pair of arms provided in the movable caliper. Insert the cylindrical guide pin so that it can slide in the axial direction,
The outer end seal portion of the outer boot is fitted into an annular groove formed on the outer periphery of the outer end of the guide pin, and compression is applied to the inner end of the guide pin to lock the outer end inside the outer end seal portion of the inner boot. An annular retainer is disposed via a spring, the inner end seal portion of the inner boot is fitted into an annular groove formed on the outer periphery of this retainer, and a torque is applied to these using bolts inserted into the retainer and guide pin. a pin slide assembled to the member so that the retainer and guide pin abut, the movable caliper is able to slide in the axial direction on the guide pin, and is urged outward by the compression spring; In the type disc brake, an outer circumferential surface is provided at the outer end of the inner end seal portion of the inner boot, and extends in the axial direction from the bellows part of the inner boot, and is located outward from the annular groove of the retainer. An inner boot characterized by integrally forming a raised part thicker than the bellows part that comes into contact with the bellows part.