JPS6212408B2 - - 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.

This type of disc brake has a structure in which a caliper that straddles the edge of the disc rotor is supported by a fixed support so as to be movable in the axial direction of the disc rotor via a pair of guide pin support mechanisms. The guide pin support mechanism generally has a structure in which a guide pin fixed to one of the support or caliper is slidably fitted into an opening formed in the other support or caliper.

In this configuration, it is important to maintain stable resistance on the sliding surface of the guide pin and the opening that fits into it, and the precision of the positional relationship between the pair of guide pins and the opening that fits into it is also important from the perspective of assembly. This has become a problem, and for this reason, the following ideas are often devised in the guide pin support mechanism.
That is, by interposing an elastic sleeve between the guide pin and the sliding surface of the aperture that fits into the guide pin, a certain degree of positional error can be absorbed by its elastic deformation, and the end of the sleeve can be opened in a bellows shape or the like. It extends from the edge of the hole and is fixed to the circumferential surface of the guide pin, thereby sealing and blocking the sliding surface from the outside.

The present invention further improves the structure of this type of guide pin support mechanism.

That is, the above-mentioned problem can be effectively solved by the intervention of the elastic sleeve, but since the disc brake is mounted on a vehicle, vibrations are constantly applied, and the elastic sleeve is repeatedly deformed. Therefore, it is necessary to take that fatigue into account.
In other words, if the cylindrical elastic sleeve is simply interposed between the guide pin and the opening, the sleeve will wear out over time and the initial effect cannot be expected.

The present invention has been made to solve these difficulties, and structurally improves the durability of the elastic sleeve by preventing it from being deformed more than necessary due to vibrations. That is, the present invention
A caliper having a pair of opposing parts facing each other with the disc rotor in between is supported by a fixed support so as to be movable in the axial direction of the disc rotor via a pair of guide pin support mechanisms, and is built in one of the opposing parts. In a pin-type disc brake in which a piston presses a friction pad on one side of a disc rotor and moves by the reaction force, the other opposing part presses a friction pad on the other side of the disc rotor, the guide pin support mechanism The guide pin fixed to one of the caliper or the support is slidably fitted into an opening formed in the other of the caliper or the support via a sleeve mechanism, and the sleeve mechanism has a generatrix on the circumferential surface of the guide pin. an elastic body including a plurality of rod-shaped guide portions that are in contact with each other along the direction and a bellows-shaped boot portion that extends from the opening edge and is fixed to the circumferential surface of the guide pin; This is a caliper guide mechanism for a pin type disc brake, characterized in that it is constituted by a rigid body that determines a radial compression limit.

The present invention will be explained below with reference to embodiments shown in the drawings.

1A and 1B show a conventional example, in which 1 is a support, 2 is a caliper, 3 is an opening formed in the caliper 2, and 4 is a cylindrical guide arranged to pass through the opening 3. The pin 5 is a bolt that is inserted from one end of the cylindrical guide pin 5 and whose tip is screwed and fixed to the support 1. to be fixed. Reference numeral 7 denotes an elastic body including a bushing part 8 and a bellows-like boot part 9. The central bushing part 8 is fixed to the caliper 2, and the inner circumferential surface is intermittently guided in the circumferential direction as shown in FIG. An uneven portion is formed so as to be in contact with the pin 4. Also, boots part 9
Both ends of the guide pin 4 are fixed to the circumferential grooves 10 and 11 of the guide pin 4 with a certain tightening force, respectively, to seal and cut off the sliding surface from the outside air.

On the other hand, in the example of the present invention shown in FIG. 12, and the rod-shaped guide portions 12 are respectively fitted into a plurality of grooves 14 in the generatrix direction of the inner peripheral surface of a rigid body 13 fixed to the caliper 2 side.

FIG. 3 shows an embodiment in which the rigid body 13 is divided in the circumferential direction and interposed between the rod-shaped guide portions 12 of the elastic body 7'.

With such a configuration, in the conventional example, the bushing portion 8 of the elastic body 7 is deformed as a whole when the guide pin 4 moves in the radial direction due to the vibration of the caliper 2, but in the example of the present invention, The rod-shaped guide portion 12 of the elastic body 7' is deformed to the extent that it protrudes radially inward from the groove 14 of the rigid body 13, and further vibration of the caliper 2 is regulated by the rigid body 13. This prevents more deformation than necessary. Therefore, there is an advantage that the durability of the elastic body is improved by the configuration of the caliper guide mechanism.

As described above, the caliper guide mechanism of the pin type disc brake according to the present invention can maintain stable sliding resistance by simply improving the structure, and the benefits thereof are extremely large.

[Brief explanation of the drawing]

FIG. 1A is a partial cross-sectional view of a caliper guide mechanism showing a conventional example, FIG. Cross-sectional view, Figure 2 (b) is B-B in Figure 1 (a)
FIG. 3 is a cross-sectional view of a caliper guide mechanism showing another embodiment. 1...Support, 2...Caliper, 3...Opening hole, 4...
Guide pin, 5... Bolt, 6... Washer, 7,
7'... Elastic body, 8, 8'... Bush part, 9... Boot part, 10, 11... Circumferential groove, 12... Rod-shaped guide part, 1
3... Rigid body, 14... Concave groove.

Claims (1)

[Claims] 1. A caliper having a pair of opposing parts that sandwich the disc rotor in between is supported by a fixed support so as to be movable in the axial direction of the disc rotor via a pair of guide pin support mechanisms, and is built in one of the opposing parts. In a pin type disc brake, the piston presses the friction pad on one side of the disc rotor, and the other opposing part presses the friction pad on the other side of the disc rotor by moving due to the reaction force. The mechanism is provided such that a guide pin fixed to one of the caliper or the support is slidably fitted into an opening formed in the other of the caliper or the support via a sleeve mechanism, and the sleeve mechanism an elastic body including a plurality of rod-shaped guide portions that contact along the generatrix direction and a bellows-shaped boot portion extending from the opening edge and fixed to the circumferential surface of the guide pin, and each of the rod-shaped guide portions of the elastic body; A caliper guide mechanism for a pin type disc brake, characterized in that the caliper guide mechanism is comprised of a rigid body that determines the radial compression limit of the caliper guide mechanism.