JPS6020839Y2 - Pin slide type disc brake - Google Patents

Description

[Detailed description of the invention] The present invention has a first end surface of a hollow cylindrical bushing in contact with a mounting bracket, and a bolt passed through the hollow part of the bushing from the second end surface side of the bushing is attached to the mounting bracket. The present invention relates to a pin slide type disc brake that includes a slide pin that fixes the bushing to a mounting bracket by screwing the bushing into the mounting bracket.

The purpose of this is to ensure that when a bushing that has been removed from a mounting bracket for pad replacement is reattached, the bushing will not tilt even if rust forms near the bushing on the surface of the mounting bracket. The purpose of this is to prevent problems such as increased drag torque and brake squeal caused by strained sliding of the caliper.

The present invention will be described below based on its embodiments.

FIG. 1 shows a pin slide type disc brake that is an embodiment of the present invention, in which a caliper 1 has an actuator (hydraulic cylinder) la, and is mounted on a mounting bracket 3 while straddling a disc rotor 2. It is mounted on a pair of slide pins 4.4.

When the brake is applied, the caliper 1 presses the inner pad 6 against the disc rotor 2 by the piston of the actuator 1a, and the reaction force causes the caliper 1 to slide on the slide pin 4 in a direction perpendicular to the plate surface of the disc rotor 2. The outer pad 5 is pressed against the disc rotor 2 by the claw portion 1b provided opposite to the outer pad 5.

In FIG. 2 showing a cross-sectional view of a portion of the slide pin 4, the slide pin 4 is separated from a bush 41, a bolt 42, and a washer 43.

The bushing 41 has a hollow cylindrical shape, and its first end surface 41
a to the mounting bracket 3, and then tighten the bolt 4.
A washer 43 is interposed between the head of the bush 41 and the second end surface 41b, and the bolt 42 is passed through the hollow part of the bush 41 and tightened to the mounting bracket 3.

The bushing 41 is now fixed to the mounting bracket 3.

The contact surface 3a of the mounting bracket 3 with the first end surface 41a of the bushing 41 protrudes from the mounting bracket itself 3, and the outer periphery 3b of the contact surface is the outer periphery 41 of the first end surface 41a of the bushing 41.
It is formed closer to the center of the bushing (in the radial inward direction) than c.

With the configuration described above, the following effects can be expected.

That is, conventionally, as shown in FIG. 3, when rust A occurs around the bushing on the surface of the mounting bracket 3, the bushing 41 (one of the pair) that has been removed for pad replacement When attaching the bushing 3 to the mounting bracket 3 again, as shown in Fig. 4, the bushing 3 was slightly shifted from the initial mounting position and rested on the rust A, tilting as shown by the angle θ (straight line 1-1). indicates the axis of the bushing 41 during initial installation, and lines z' and z' indicate the axis of the bushing 41 after re-installation).

However, according to the configuration of the present invention, rust does not occur on the abutting surface 3a of the mounting bracket 3 with the bushing 41, so that the bushing will not be reattached in an inclined state due to rust.

Therefore, even after pad replacement, the parallel relationship between the pair of bushes 41 is maintained, and the caliper 1 slides smoothly without becoming strained, thereby preventing problems such as increased torque and brake noise caused by dragging.

By the way, as for rust prevention measures such as changing the material or surface treatment, even if the bushings are made of expensive stainless steel or surface treatments such as chrome plating are applied, the parts are small so the cost will not increase that much ( However, since the bushing is an important part that affects the sliding condition of the caliper, it may be necessary to choose a method with a high rust prevention effect even if it is costly). However, the use of expensive materials in the mounting bracket with a large surface area The implementation of other surface treatments would lead to a much greater cost increase.

[Brief explanation of the drawing]

Figure 1 is a plan view of the disc brake of the present invention, Figure 2 is a half sectional view of the pin slide part of the present invention, and Figures 3 and 4 are of the pin slide part to illustrate the conventional problems. External view.

Claims (1)

[Scope of utility model registration request] By bringing the first end surface of a hollow cylindrical bushing that has been subjected to anti-rust treatment into contact with the mounting bracket, and screwing a bolt that passes through the hollow part of the bushing from the second end surface side of the bushing into the mounting bracket. , in a pin slide type disc brake equipped with a slide pin shaped to fix the bushing to a mounting bracket, a contact surface of the mounting bracket with the first end face of the bushing is made to protrude from the mounting bracket itself; A pin slide type disc brake characterized in that the outer periphery of the contact surface is formed closer to the center of the bushing than the outer periphery of the first end surface.