JPH09257061A - Disc brake - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce the occurrence of pad deviated wear phenomenon through reduction of an elastic deformation amount of a mounting due to brake torque. SOLUTION: A mounting 14 comprises an inner bridge member 14a on which brake torque exerted on an inner pad 12 is applied directly; an outer bridge member 14b on which brake torque exerted on an outer pad 13 is applied directly; and a pair of pins 14c, 14d, 14e, and 14f in the axial direction of a disc rotor to intercouple the two bridge members on the disc rotor rotation-in side and a disc rotor on the rotation-out side. A slide caliper 15 are positioned between the two bridge members 14a and 14b and has a pair of boss parts slidably fitted in the outer peripheries of the pins 14c, 14d, 14e, and 14f. A clearance between the pin and an engaging part with the boss part is set such that brake torque transmitted from the two pads to the caliper during brake is received by the pin on the disc rotor rotation-in side.

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to a disc brake used as a wheel brake of a vehicle,
In particular, the present invention relates to a disc brake that reduces the uneven wear phenomenon and abnormal noise of the pad and obtains a stable braking force.

[0002]

2. Description of the Related Art Today, as a disc brake used as a vehicle wheel brake, a disc rotor that rotates integrally with a vehicle wheel, and an inner pad and an outer pad that face an inner surface and an outer surface of the disc rotor, respectively. A mounting that is fixed to a non-rotating portion of the vehicle inside the disc rotor and receives brake torque applied to a pair of pads; and a mounting that is slidably supported in the disc rotor axial direction by the mounting via a pair of pins. A structure having a pair of pads and a sliding caliper that presses the pads from behind toward the disk rotor is often used. The mounting is formed as a single piece. Further, the pin is slidably fitted in a mounting hole and fixed to the sliding caliper, or slidably penetrates a hole of a boss portion of the sliding caliper and fixed to the mounting. The brake torque applied to the inner pad and the outer pad during braking is prevented from being applied to the mounting through the caliper and the pin, and the brake torque applied to the inner pad and the outer pad is directly received only by the mounting. Has been done.

[0003]

However, in the above disc brake, the mounting is elastically deformed by receiving the brake torque during braking. FIG. 5 is a skeleton view of the mounting postures during non-braking and during braking. The broken line indicates the non-braking posture, and the solid line indicates the braking posture.
Such elastic deformation of the mounting causes the pin to tilt and the pin to tilt causes the sliding caliper to rotate.
Rotation of the sliding caliper causes uneven surface pressure distribution of each pad to promote uneven wear of the pad, and the behavior of the caliper when shifting from non-braking to braking becomes complicated and braking force is increased. It becomes unstable, and abnormal noise is generated under special conditions.

An object of the invention of this application is to reduce the amount of elastic deformation of the mounting during braking to reduce the uneven wear phenomenon of the pad.

[0005]

According to the present invention, there is provided a disk brake according to the present invention, comprising: a disk rotor which rotates integrally with a vehicle wheel;
An inner pad and an outer pad that respectively face the inner side surface and the outer side surface of the disc rotor, and a mounting that is fixed to a non-rotating portion of the vehicle inside the disc rotor and receives a brake torque applied to the pair of pads, A disc brake, which is slidably supported by the mounting in the axial direction of the disc rotor and has a sliding caliper that presses the pads from behind toward the disc rotor, the mounting comprising: An inner bridge member that is arranged inside the rotor and directly receives the brake torque applied to the inner pad; an outer bridge member that is arranged outside the disc rotor and directly receives the brake torque applied to the outer pad; Insert the bridge member into the disk rotor And a pair of pins in the disc rotor axial direction that are coupled to each other on the disc rotor shunting side, and the sliding caliper is located between the bridge members and is provided on the outer circumference of the pair of pins. It has a pair of boss portions slidably fitted to each other, and the clearance between the pair of pins and the pair of boss portions fits the brake torque transmitted from both pads to the caliper at the time of braking the disc rotor. It is set to be received by the pin on the entry side.

It is preferable that the boss portion of the caliper is brought as close as possible to the outside where the amount of elastic deformation due to the brake torque increases.

In the disc brake having such a structure, part of the brake torque applied to the inner pad and the outer pad during braking is applied to the pin on the disc rotor entry side via the caliper. In other words, the braking torque applied to the inner pad and the outer pad at the time of braking is dispersed and applied to the mounting, so that the elastic deformation of the mounting, especially the elastic deformation of the outer part is reduced,
As a result, the amount of rotation of the caliper is reduced, non-uniformity of the surface pressure distribution of the pad is suppressed, and uneven wear phenomenon is reduced.

[0008]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of a disc brake according to this application will be described below.

1 to 4 show one embodiment. 1 to 3, a disc brake 10 includes a disc rotor 11 that rotates integrally with a wheel (not shown), an inner pad 12 and an outer pad 13 that are arranged inside and outside the disc rotor 11, respectively. One side of the disc rotor 11 is fixed to a non-rotating portion (not shown) of the vehicle by a bolt and guides both pads 12 and 13 so as to be movable along the disc rotor axis.
The mounting 14 includes a mounting 14 that directly receives the brake torque applied to the Nos. 2 and 13, and a caliper 15 that is slidably supported by the mounting 14 in the disc rotor axial direction.

The mounting 14 is the disk rotor 1
Inner bridge member 14a disposed inside 1 to directly receive the brake torque applied to the inner pad 12, and outer bridge member 1 disposed outside the disk rotor 11 to directly receive the brake torque applied to the outer pad 13.
4b, and a pair of bolts 14c and 14d in the disc rotor axial direction that connect these bridge members to each other on the disc rotor entry side and the disc rotor exit side. The bolts 14c and 14d are provided with hollow pins 14e and 14f on the outer peripheral side thereof.
14f is clamped and fixed between the bridge members 14a and 14b.

The sliding caliper 15 includes both bridge members 14
Hollow pins 14e and 14f located between a and 14b
Pair of bosses 15a, 15 slidably fitted to the outer periphery of the
b. The sliding caliper 15 has a cylinder portion 15c on the inside, and a piston (not shown) which is actuated by brake fluid pressure to press the inner pad 12 against the disc rotor 11 from behind is fitted into the cylinder portion 15c. Have been combined. As a reaction of the piston pressing the inner pad 12 against the disk rotor 11, the caliper 15 presses the outer pad 13 against the disk rotor 11 from behind.

Peripheries of hollow pins 14e and 14f and boss 1
The clearance between the inner circumferences of 5a and 15b is set such that the brake torque transmitted from the pads 12 and 13 to the caliper 14 during braking is applied to the hollow pin on the disc rotor entry side. FIG. 4 shows this relationship, in which the center of the boss portions 15a and 15b is the hollow pin 14
The bosses 15a and 15b are offset from the centers of e and 14f in the direction of reducing the center interval.

Hollow pins 14e, 14f and boss 15a,
To protect the sliding part with 15b from foreign matter such as muddy water,
Flexible dust boots 16, 16, 16, 16 are provided.

Disc brake 1 having the above-described structure
0, the braking torque applied to the inner pad 12 and the outer pad 13 at the time of braking is directly received by the inner bridge member 14a and the outer bridge member 14b, respectively, and the caliper is generated by the frictional force between the pads 12, 13 and the caliper 15. 15 and the caliper 14 is displaced to the disk rotor shunting side. When the rotation direction of the disk rotor 11 is the left direction in FIG. 1, the caliper 15
The inner periphery of the boss portion 15a on the disc rotor entry side of the above contacts the outer periphery of the hollow pin 14e, and the brake torque transmitted to the caliper 15 is transmitted through the hollow pin 14e to the mounting 1
4 is loaded. In this way, since the brake torque applied to the pads 12 and 13 is dispersedly applied to the mounting 14, the elastic deformation amount of the mounting 14 is suppressed to a small amount, and the unevenness of the surface pressure distribution of the pads 12 and 13 is reduced. As a result, the uneven wear phenomenon of the pad is reduced, the behavior of the caliper when shifting from the non-braking state to the braking state is improved, the braking force is stabilized, and abnormal noise is reduced.

Even when the disc rotor has a different thickness, it can be dealt with by simply changing the hollow pin and the bolt to different lengths, and since the inner bridge member has a flat plate shape, the workability is improved and the cost can be reduced. There are advantages such as.

[0016]

In the disc brake according to the invention of this application, a part of the brake torque applied to the inner pad and the outer pad during braking is applied to the pin on the disc rotor entry side via the caliper. In other words, the braking torque applied to the inner pad and the outer pad at the time of braking is dispersed and applied to the mounting, so that the elastic deformation of the mounting, especially the elastic deformation of the outer part is reduced, which reduces the rotation amount of the caliper, There is an effect that uneven contact pressure distribution of the pad is suppressed and uneven wear phenomenon is reduced. .

[Brief description of drawings]

FIG. 1 is a plan view of an embodiment of the invention of this application.

FIG. 2 is a front view seen from below in FIG.

FIG. 3 is a diagram viewed from the right side of FIG.

FIG. 4 is a diagram showing a state of clearance between a hollow pin and a boss portion.

FIG. 5 is a diagram showing elastic deformation of a mounting of a conventional disc brake.

[Explanation of symbols]

 10 ... Disc brake 11 ... Disc rotor 12, 13 ... Pad 14 ... Mounting 14a ... Inner bridge member 14b ... Outer bridge member 14c, 14d ... Bolts 14e, 14f ...・ Hollow pin 15 ... Caliper 15a, 15b ... Boss

Claims (1)

[Claims] 1. A disc rotor that rotates integrally with a wheel of a vehicle, an inner pad and an outer pad that respectively face an inner surface and an outer surface of the disc rotor, and a non-rotating portion of the vehicle inside the disc rotor. A mounting that is fixed and receives brake torque applied to the pair of pads, and a slide that is slidably supported by the mounting in the axial direction of the disk rotor and presses both pads from behind toward the disk rotor. In a disc brake including a caliper, the mounting includes an inner bridge member arranged inside the disc rotor and directly receiving a brake torque applied to the inner pad, and the outer pad arranged outside the disc rotor. Directly receives the brake torque applied to The sliding caliper is composed of a bridge member and a pair of pins in the disc rotor axial direction that couple these bridge members to each other on the disc rotor entry side and the disc rotor exit side. And a pair of boss portions that are slidably fitted to the outer circumferences of the pair of pins, and the clearance between the pair of pins and the pair of boss portions is equal to the clearance during braking. A disc brake, wherein the brake torque transmitted from both pads to the caliper is set by a pin on the disc rotor entry side.