JPH09296836A - Disc brake caliper - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce the brake dragging phenomenon and the pad partial wearing phenomenon. SOLUTION: Respective pads 12, 12 are supported by a pad supporting pin 16 slidably inserted through holes of back plates 12a, 12a of the pads 12, 12 and having both ends fitted in holes of a mounting member 13. The pad supporting pin 16 is arranged in the position offset from the center position in the disc rotor rotating direction of the pads 12, 12 in one direction in the disc rotor rotational direction. An intermediate part of a base part 18a of a spring member 18 is engaged with an annular groove 16a in the center part of the pad supporting pin 16, and one end of the base part 18a is supported to the mounting member 13. A spring action part 18b is formed on the other end of the base part 18a, and the pads 12, 12 are energized in the direction to be separated from the disc rotor and inward in the disc rotor radial direction by being engaged with the back plates 12a.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The invention of the present application relates to a disc brake caliper in a disc brake used as a vehicle wheel brake, and more particularly to reducing a brake drag phenomenon in a non-braking state and reducing a pad uneven wear phenomenon. It relates to an inexpensive disc brake caliper.

[0002]

2. Description of the Prior Art In Japanese Utility Model Laid-Open No. 5-45266, a disk rotor that rotates integrally with a vehicle wheel, a pair of pads facing the side surfaces of the disk rotor, and a non-rotating portion of the vehicle are fixed. Disc brake including a mounting member for receiving a brake torque applied to the pad and a pad support pin slidably penetrating the back plates of the pair of pads and having both ends supported by the mounting member. In the caliper, the pad support pin is arranged at a central position in the disc rotor rotation direction of the pad, and a pair of hairpin-shaped spring members are arranged on the disc rotor inflow side and the disc rotor outflow side of the pad support pin, These spring members urge the pair of pads away from the disc rotor, and the disc rotor unwinding direction. Is energized, the disc brake caliper and reduce the impact sound at the beginning brakes with reducing the brake drag phenomenon in the non-braking state is disclosed.

[0003]

However, in the disc brake caliper described above, since two spring members for urging the pair of pads in the direction of separating from the disc rotor are used, the cost becomes high. If one spring member is omitted to reduce the cost, the spring member biases the positions of the pair of pads that are biased in the disc rotor rotation direction. Since it cannot be separated from the disk rotor, the brake drag phenomenon and the uneven wear phenomenon of the pad become remarkable.

According to the invention of this application, a pair of pads facing the side surface of the disk rotor of the disk rotor that rotates integrally with the wheels of the vehicle, and a brake torque applied to the pads fixed to the non-rotating portion of the vehicle are provided. A disc brake caliper, comprising: a mounting member for receiving; and a pad support pin slidably penetrating the back plates of the pair of pads and having both ends supported by the mounting member. An object of the present invention is to provide a disc brake caliper that can separate a pair of pads as a whole from a disc rotor when a brake is released by a member.

[0005]

The disc brake caliper according to the invention of the present application according to the above object faces the side surface of the disc rotor of the disc rotor which rotates integrally with the wheel of the vehicle as described in claim 1. A pair of pads, a mounting member that is fixed to a non-rotating portion of the vehicle and receives a brake torque applied to the pad, and a pair of pads that slidably penetrate through the back plates and both ends of the pad for mounting. A disc brake caliper comprising one pad support pin supported by a member, wherein the pad support pin is arranged at a position offset from a central position of the pad in the disc rotor rotation direction in one direction of the disc rotor rotation direction. , The middle part is connected to the center between both ends of the pad support pin to regulate the movement in the disc rotor axial direction. And one end of the mounting member is received by the mounting member, and the other end of the base is formed integrally with the mounting member, and the pair of pads are pressed into contact with the central portion of the back plate of the pair of pads in the disk rotor rotation direction. A spring member having a spring acting portion that urges the rotor in a direction of separating from the rotor is installed.

In the disc brake caliper having such a structure, although only one spring member is used, one spring member is provided so as to separate the central portions of the pair of pads in the disc rotor rotation direction from the disc rotor. When the brake is released, the pair of pads are separated from the disc rotor as a whole so that the brake drag phenomenon and the uneven wear phenomenon of the pads are reduced.
Moreover, it is cheap.

According to a second aspect of the present invention, the spring action portion of the spring member urges the pair of pads inward in the radial direction of the disk rotor, so that the vehicle is running. It is possible to reduce noise caused by rattling of the pad in the radial direction of the disc rotor due to wheel vibration.

Further, as described in claim 3, a groove is formed in the center between both ends of the pad support pin, and the intermediate portion of the base portion of the spring member is formed in a curved shape so as to be engaged in the groove. The pad support pin and the spring member base are connected by engaging the groove and the curved intermediate portion, so that the pad support pin and the base of the spring member can be easily assembled into an engaging structure. Can be And
Since the pad support pin is prevented from coming off by the spring member, a member dedicated to preventing the pad support pin from coming off is unnecessary.

Further, as described in claim 4, the spring action portion of the spring member is provided with a pair of axially extending portions extending in the axial direction of the disc rotor from the other end of the base portion. A radial extending portion extending inward from the tip of the existing portion in the radial direction of the disk rotor, and an inclined portion extending from the tip of the radial extending portion in a direction opposite to the axial extending portion. By doing so, unreasonable stress does not occur in the spring action portion, and the damage can be suppressed.

According to a fifth aspect of the present invention, a groove portion for engaging the inclined portion of the spring member is formed in a central portion of the back plates of the pair of pads in the disk rotor rotation direction. Thereby, the engagement positional relationship between the inclined portion and the back plate can be stabilized.

Further, as described in claim 6, by integrally forming the pad support pin and the spring member base, the number of constituent members is reduced and the cost is further reduced.

[0012]

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

1 to 4 show one embodiment. 1 and 2, the disc brake caliper 10 is an opposed fixed cylinder type disc brake caliper,
A pair of pads 12, 12 arranged on both sides of the disk rotor 11 of the disk rotor 11 that rotates integrally with wheels (not shown) and facing the side surface of the disk rotor 11,
A mounting member fixed to a non-rotating portion (not shown) of the vehicle on one side of the disc rotor 11 by guiding each pad 12 movably along the disc rotor axis and receiving a brake torque applied to each pad 12. (Also referred to as a caliper body) 13, a cylinder 13a integrally formed with the mounting member 13,
13a is slidably fitted into the brake fluid pressure chamber 14,
14 is formed, and the brake fluid pressure is applied to the brake fluid pressure chamber 14 to press each pad 12 from behind toward the disc rotor 11 to frictionally engage the disc rotor 11. I have it.

Each pad 12 has one pad support pin 1
6 and the receiving portion 13 formed on the mounting member 13
It is supported by the mounting member 13 by b and 13b. The pad support pins 16 are arranged offset from the center position of each pad 12 in the normal rotation direction of the disc rotor (rightward in FIG. 2 and indicated by an arrow) toward the disc rotor feeding side. Back plate 1
The hole 2a is slidably penetrated, and both ends are fitted in the holes of the mounting member 13. Receiver 13
b and 13b restrict the movement of each pad 12 that receives the rotational force inward in the radial direction of the disc rotor when the mounting member 13 receives the brake torque applied to each pad 12 during braking.
When the brake torque transmitting portion from the pad 12 to the mounting member 13 is configured so as not to generate the rotational force, the receiving portions 13b and 13b can be omitted.

A shim 1 for preventing brake squeal is provided between the back plates 12a, 12a of the pads 12 and the pistons 15, 15.
7, 17 are interposed. The shims 17, 17 are formed with holes through which the pad support pins 16 slidably pass.

Spring members 18 are installed on the outer sides of the pads 12, 12 in the radial direction of the disk rotor. The spring member 18 includes a base portion 18a and a spring action portion 18b. The intermediate portion 18a1 of the base portion 18a is curved and engages with the annular groove 16a formed in the middle of the pad support pin 16 from the inside in the radial direction of the disc rotor, and also the base portion 18a.
One end 18a2 of the disk is abutted against the mounting member 13 from the outside in the radial direction of the disk rotor. The engagement between the groove 16a of the pad support pin 16 and the base portion 18a of the spring member 18 prevents the pad support pin 16 from coming off from the mounting member 13.

The spring action portion 18b of the spring member 18 includes a pair of axially extending portions 18b1 and 18b1 extending in the axial direction of the disc rotor from the other end of the base portion 18a, and a disc from the tip of each axially extending portion 18b1. A pair of radial extending portions 18b2, 18b2 extending inward in the rotor radial direction, and extending from the tips of the radial extending portions 18b2 in the disk rotor axial direction and in the direction opposite to the axial extending portion 18b1. And a pair of inclined portions 18b3 and 18b3. Each inclined portion 18b3
Engages with the bottom of the groove 12b formed at the central position of the back plate 12a of the pad 12. As shown in FIG. 4, each pad 12 is urged by the spring action portion 18b of the spring member 18 in the direction away from the disk rotor 11 by the force F1 and inward in the disk rotor radial direction by the force F2. Energized. As a result, each pad 1 during non-brake action
The rattling of No. 2 in the radial direction of the disc rotor is suppressed to reduce noise, and when the brake is released, each pad 12 is positively separated from the disc rotor 11 to reduce the brake drag phenomenon and reduce the uneven wear phenomenon of the pad. It will be reduced.

The pad support pin 16 is arranged on the disc rotor entry side with respect to the center position of the pad 12 in the disc rotor rotation direction, and the base of the spring member 18 is located at the center position of the pad 12 in the disc rotor rotation direction. On the other hand, it can be carried out by changing the position so that it is located on the disc rotor entry side.

Further, the annular groove 16a of the pad support pin 16
Can be carried out by changing to a notch groove.

Further, as shown in FIG. 5, the pad supporting pin 16 'and the spring member 18' can be integrally formed from a plate material.

[0021]

In the disc brake caliper according to the invention of this application, although only one spring member is used, one spring member extends from the disc rotor to the central portion of the pair of pads in the disc rotor rotation direction. Since the pair of pads are separated from the disc rotor when the brake is released, the pair of pads are separated from each other, so that the brake drag phenomenon and the uneven wear phenomenon of the pads are alleviated. Moreover, it is cheap.

[Brief description of drawings]

FIG. 1 is a longitudinal sectional view of an embodiment of the present invention.

FIG. 2 is a plan view of an embodiment of the invention of this application.

FIG. 3 is a diagram showing a relative relationship between a pad, a pad support pin, and a spring member.

FIG. 4 is a diagram showing a relationship between a spring member and a pad.

FIG. 5 is a view showing an example in which a pad support pin and a spring member are integrally formed.

[Explanation of symbols]

 10 ... Disc brake caliper 11 ... Disc rotor 12 ... Pad 12a ... Back plate 12b ... Groove 13 ... Mounting member 13a ... Cylinder 15 ... Piston 16 ... Pad support pin 16a ... Annular groove 16 '... Pad support pin 17 ... Shim 18 ... Spring member 18a ... Base part 18b ... Spring action part 18' ... Spring member

Claims (6)

[Claims] 1. A pair of pads facing a side surface of a disk rotor of a disk rotor that rotates integrally with a vehicle wheel, and a mounting member fixed to a non-rotating portion of the vehicle for receiving a brake torque applied to the pads. And a pad support pin slidably penetrating the back plates of the pair of pads and having both ends supported by the mounting member, wherein the pad support pin is a disc of the pad. It is arranged at a position offset from the center position in the rotor rotation direction in one direction in the disk rotor rotation direction, and an intermediate portion is connected to the center between both ends of the pad support pin to restrict movement in the disk rotor axial direction and one end The base part received by the mounting member and the front part of the pair of pads integrally formed on the other end of the base part Disc brake caliper, characterized in that installed a spring member having a spring action portion is pressed against the disc rotor rotation direction central portion of the back plate to urge the pair of pads in a direction away from the disk rotors. 2. The disc brake caliper according to claim 1, wherein the pair of pads are biased inward in the radial direction of the disc rotor by the spring action portion of the spring member. Brake caliper. 3. The disc brake caliper according to claim 1 or 2, wherein a groove is formed in a center between both ends of the pad support pin, and the intermediate portion of the base portion of the spring member is provided in the groove. A disc brake caliper characterized in that the pad support pin and the base portion are connected to each other by the engagement between the groove and the curved intermediate portion. 4. The disc brake caliper according to claim 1, wherein the spring action portion of the spring member extends from the other end of the base portion in the disc rotor axial direction. The pair of axially extending portions, the radial extending portions extending inward in the disk rotor radial direction from the tips of these extending portions, and the axial extending portions from the tips of these radial extending portions. A disc brake caliper characterized by comprising an inclined portion extending in the opposite direction. 5. The disc brake caliper according to claim 1, wherein the disc rotor of the back plate of the pair of pads has a groove portion that engages the inclined portion of the spring member. A disc brake caliper that is formed in the central portion in the rotational direction. 6. The disc brake caliper according to claim 1 or 2, wherein the pad support pin and the spring member are integrally formed.