JPH0674261A - Disc brake - Google Patents

Abstract

PURPOSE:To prevent the partial wear of pads and improve brake response. CONSTITUTION:Wear resistant members 9 are provided at the inner and outer peripheral edges of the sliding face 7a of a disc rotor 7. Outer pads 8a are in constant contact with the wear resistant members 9. An inner pad 8b is friction-engaged with the disc rotor 7 at the braking time. Plate springs 3a, 3b are fitted to a piston 4 and an arm part 6 so as to press the outer pads 8a to the disc rotor 7.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to improvements in disc brakes.

[0002]

2. Description of the Related Art Floating disc brakes (for example, FIG. 1 of Japanese Patent Publication No. 1-35218) and piston-opposed disc brakes (for example, FIG. 2 of Japanese Patent Publication No. 1-1625) have pads. A cylinder portion for accommodating the attached piston is provided, an annular groove having a trapezoidal cross section is provided in the cylinder portion, and an elastic seal ring having a rectangular cross section is provided between the annular groove and the piston.

[0003]

When the piston is pressed by the hydraulic pressure, the piston moves forward (toward the disc rotor) to elastically deform the seal ring, and when the hydraulic pressure is released thereafter, the restoring force of the seal ring causes the piston to move. The piston retracts (towards the cylinder) and pulls the pad away from the disc rotor, but if the desired restoring force is not obtained due to wear of the seal ring, the disc rotor drags when the brake is not applied, and the pad wears unevenly. There is a problem of doing. If the clearance between the disc rotor and the pad is increased to prevent the pad from dragging,
There is a problem that the braking response deteriorates and the braking force decreases. Therefore, the present invention has been made in order to solve the above problems, and provides a disc brake which prevents uneven wear of the pads and has a good brake response.

[0004]

DISCLOSURE OF THE INVENTION According to the present invention, there is provided a disk rotor having wear-resistant members around the inner and outer peripheral edges of a sliding surface, an outer pad contacting the wear-resistant member, and the sliding surface. A floating disc brake having an inner pad that frictionally engages with the caliper and a plate spring that is attached to the piston and arm of the caliper and that presses the outer pad toward the disc rotor and a wear resistant member The disk rotor is provided around the inner and outer peripheral edges, the outer pad that comes into contact with the wear resistant member, the inner pad that frictionally engages with the sliding surface, and the pistons that are opposed to the caliper are attached to the outer pad. A piston-opposed disc brake including a leaf spring that presses the disc rotor side.

[0005]

When braking, the outer pad is brought into sliding contact with the wear resistant member of the disk rotor, the inner pad holds the disk rotor, and when the braking is released, the outer pad continues to contact the wear resistant member. , The inner pad is separated from the disc rotor.

[0006]

1 shows a floating disc brake as a first embodiment of the present invention, in which a cylinder portion 5 for accommodating a piston 4 having a leaf spring 3a mounted on one side thereof via a bridge portion 2 of a caliper 1 is shown. Is provided, and the leaf spring 3 is provided on the other side.
An arm portion 6 to which b is attached is provided, and an outer pad 8a and an inner pad 8b are interposed between the leaf springs 3a and 3b and the disc rotor 7, and the both pads 8a and 8b are provided with a torque receiving member (not shown) by an appropriate means. Attached),
It is formed so as to be able to move forward and backward in the axial direction of the disc rotor 7. An annular groove (not shown) having a trapezoidal cross section is provided in the cylinder portion 5, and an elastic seal ring (not shown) having a rectangular cross section is interposed between the annular groove (not shown) and the piston 4. It is set up. Abrasion resistant member 9 is provided around the inner and outer peripheral edges of sliding surface 7a of disk rotor 7, and abrasion resistant member 9 is formed by a surface modification method such as thermal spraying.

When the piston 4 is pressed by hydraulic pressure during braking, the piston 4 advances (toward the disk rotor 7 in FIG. 1) and elastically deforms the leaf spring and the seal ring (not shown). When the piston 4 is continuously pressed by the hydraulic pressure, the outer and inner pads 8a, 8b are pressed through the leaf springs 3a, 3b, the outer pad 8a slides on the wear resistant member 9, and the inner pad 8b moves. Hold the outer and inner pad 8
The a and 8b and the disc rotor 7 are frictionally engaged with each other.

After that, when the hydraulic pressure is released, the leaf spring 3
When the piston 4 retreats (in the direction of the cylinder portion 5 in FIG. 1) due to the restoring force of a, 3b and a seal ring (not shown), the outer pad 8a continues to make sliding contact with the wear resistant member 9, but the inner pad 8b does not. 7 is separated from the inner pad 8b to form a predetermined clearance between the inner pad 8b and the sliding surface 7a.

During non-braking, the outer pads 8a are pressed toward the disc rotor 7 by the convex portions of the leaf springs 3a and 3b, and the outer pads 8a are in contact with the wear resistant member 9.

FIG. 2 shows a piston-opposed disc brake as a second embodiment of the present invention, in which a cylinder portion 15 is provided on both sides of the caliper 11 via a bridge portion 12, and the cylinder portion 15 has a plate. It is formed in the same manner as the first embodiment except that the piston 14 having the spring 13a mounted therein is housed so as to be able to move forward and backward, and has the same effects as the first embodiment.

[0011]

According to the present invention, since the outer pad constantly contacts the wear resistant member of the disc rotor to support the disc rotor, the disc does not wear unevenly and the response at the time of braking is good. .

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing a floating disc brake.

FIG. 2 is a sectional view showing a piston-opposed disc brake.

[Explanation of symbols]

 3a leaf spring 3b leaf spring 4 piston 6 arm portion 7 disk rotor 7a sliding surface 8a outer pad 8b inner pad 9 wear resistant member 13a leaf spring 14 piston

Claims (2)

[Claims] 1. A disk rotor having wear-resistant members around inner and outer peripheral edges of a sliding surface, an outer pad contacting the wear-resistant member, and an inner pad frictionally engaging with the sliding surface. A disc brake, comprising: a piston of a caliper and a plate spring that is attached to an arm portion and presses the outer pad toward the disc rotor. 2. A disk rotor having wear-resistant members around inner and outer peripheral edges of a sliding surface, an outer pad that contacts the wear-resistant member, and an inner pad that frictionally engages with the sliding surface. , Mounted on the opposite pistons of the caliper,
A disc brake comprising a leaf spring that presses the outer pad toward the disc rotor.