JPH0159457B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a disc brake, particularly a caliper floating type disc brake for two-wheeled vehicles.

In a caliper floating type disc brake for two-wheeled vehicles, in which a fixing member is provided only on one side of the brake pad with respect to the rotational direction of the disc, thereby receiving braking torque, the friction member of the brake pad wears unevenly. Another problem is that when the vehicle is moving backwards, the brake pads are pulled in in the direction of rotation of the disc and become wedged, resulting in a so-called dragging problem.

These problems are caused by the fact that the caliper tilts due to the braking torque when the vehicle moves forward, that the circumferential speed of the disk differs in the radial direction on the surface where the friction member contacts the disk, and that the amount of return of the piston is controlled by other design factors. It is thought that this is caused by a combination of factors, such as the inability to obtain a large amount due to constraints.

In order to solve the above-mentioned problem, the inventors of this application have developed this invention based on the idea that it is effective to receive braking torque directly from a fixed member in both the forward and reverse directions. This is what led us to obtain this.

Embodiments of the present invention will be described below with reference to the accompanying drawings.

As shown in FIGS. 1 to 4, the disc brake according to the present invention is composed of a fixed member 1, a caliper 2, a pair of brake pads 3, 3', and a piston 5 inserted into a caliper cylinder 4. Ru. The fixing member 1 is provided on the rotation side in the rotation direction (see arrow in FIG. 2) when the disk A moves forward, and is secured by a slide pin 8 inserted into a hole 6 provided in the fixing member 1 via a rubber bush 7. , supports the caliper 2 in a slidable manner. Fixed member 1
is the groove 9 that spans the disk A, as shown in FIG.
are provided, and retainers 11, 11' are attached to torque receiving surfaces 10, 10' on both sides of the groove 9. The lower ends of the retainers 11, 11' are bent and also cover the lower ends of the torque receiving surfaces 10, 10'.

Although the slide pin 8 described above is shown fixed to the caliper 2 in the illustration, the slide pin 8 may be fixed to the fixing member 1, and both ends thereof are supported by the caliper 2. It may have a double-sided structure.

A long hole 14 is formed in the protrusion 13 provided at the top of the back metal 12, 12' of the brake pads 3, 3'.
It is slidably supported by a pad pin 15 that is loosely inserted into. One side of the back plate 12, 12' of each brake pad 3, 3', that is, the side on the rotation side of the disk A during forward movement, is attached to the torque receiving surface 10, 10' of the fixed member 1 with the retainer 11,
11', and the opposite side (input side) is elastically pressed by a pad spring 16 attached to the caliper 2 to prevent it from rattling.

The back metals 12 and 1 of each of the above brake pads 3 and 3'
A hook-shaped bent engagement claw 17 is protruded from the lower side of the 2' extraction side, and the engagement claw 17 is attached to the lower end of the torque receiving surfaces 10, 10' of the fixed member 1 as described above. They are slidably engaged via retainers 11 and 11'.

Note that the retainers 11 and 11' are attached to the torque receiving surface 1.
0,10', brake pads 3,
It is useful to reduce the sliding resistance of 3', but
It is not an essential component to achieve the purpose of this invention.

Since the disc brake of the present invention is constructed as described above, when braking is applied during forward movement, the braking torque applied to the brake pad is directly received by the torque receiving surface of the fixed member provided on one side of the brake pad. Therefore, since the caliper does not tilt due to braking torque, the uneven wear of the friction member becomes small in proportion to the amount of distortion of the fixed member, and the uneven wear can be substantially eliminated.

In addition, since the engaging pawl provided on the brake pad engages with the fixed member, the braking torque when going backwards is
It will be received at the engaging portion. In addition, even if the friction member of the brake pad comes into contact with the disk when the brake is not applied when going backwards, the brake pad will not move in the rotational direction of the disk, so the brake pad will wedge into the gap between the disk and the cylinder. So-called dragging does not occur.

As described above, the disc brake of the present invention is a caliper floating type disc brake in which a fixing member is provided only on one side of the brake pad with respect to the rotational direction of the disc, and the braking torque is received by this. This has the effect of preventing uneven wear and dragging.

[Brief explanation of drawings]

Figure 1 is a front view, Figure 2 is a partially omitted cross-sectional plan view, Figure 3 is a vertical side view, Figure 4 is a vertical front view,
FIG. 5 is a perspective view of the fixing member. 1... Fixed member, 2... Caliper, 3, 3'...
...Brake pad, 8...Slide pin, 10,
10'...torque receiving surface, 12,12'...back metal,
15...butt pin, 17...engaging claw.

Claims (1)

[Claims] 1. In a floating type disc brake in which the caliper and the fixed member are locked with a single pin, the engaging claw protruding from one side of the back metal of the brake pad is engaged with the torque receiving part of the fixed member, and the A disc brake characterized in that the braking torque in the direction is also directly received at the torque receiving portion of the one fixed member.