JPH0972357A - Friction pad returning structure of vehicle disk brake - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent the occurrence of partial wear and slidingly rubbing noise by forcibly returning the friction pad from the side surface of a disk rotor at the time of releasing of brake, while elastically holding both the inner and outer side surfaces of the disk of the friction pad. SOLUTION: The inside surface 12a of the disk of the liner plate 12 of a friction pad 7 is supported by a pad receiving piece, and the friction pad 7 is energized to the outside of the disk by the elastically repulsive force of the pad receiving piece. The outside surface 12b of the disk of the liner plate is supported by the inside surface 15c of the disk of a rigid member 15. The inside surface 15c of the disk of the rigid member 15 is inclined so as to be distant from the disk axis as it goes away from the disk rotor 3.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a disc brake used in various traveling vehicles such as automobiles and motorcycles. More specifically, the present invention relates to a disc lining forcibly pulling back a friction pad from the side surface of a disc rotor when braking is released. The present invention relates to a structure for preventing rubbing.

[0002]

2. Description of the Related Art As a conventional example in which a piston facing caliper body is used for a vehicle disc brake, for example, there is one disclosed in Japanese Utility Model Laid-Open No. 7-12638. This disc brake is provided with a pair of action parts of a caliper body arranged on both sides of the disc rotor, facing each other with a cylinder hole opening to the disc rotor side, and a piston is inserted into each cylinder hole to form a cylinder hole. The piston is pushed toward the disc rotor by the hydraulic fluid supplied to the hydraulic chamber at the bottom, and the friction pads arranged between the acting portion and the disc rotor are pushed toward the side face of the disc rotor. Both friction pads are supported by pad receiving pieces extending from the retainer at both inner side surfaces of the disk, and are urged outward by the elastic force of the pad receiving pieces. At the same time, the outer surface of the disk is supported by the inner surface of the disk of a rigid member that is installed on the ceiling opening of the bridge.

[0003]

DISCLOSURE OF THE INVENTION In the disc brake including the above-mentioned structure, the friction pad is separated from the side surface of the disc rotor due to a bid with the disc rotor when the piston is released and the braking is released. However, in the above friction pad, both inner and outer surfaces of the disc are held by the pad receiving piece and the rigid member, and the elastic force from the pad holding piece acts as a resistance, so that the friction pad does not compete with the disc rotor. It could not be sufficiently separated from the side surface of the disk rotor, and the lining of the friction pad was dragged by the rotating disk rotor, causing uneven wear and rubbing noise.

The present invention has been made in view of such a situation, and an object thereof is to provide a friction pad at the time of releasing the braking even when the friction pad is elastically held on both inner and outer sides of the disk. It is an object of the present invention to provide a friction pad returning structure for a vehicle disc brake which can effectively prevent the occurrence of uneven wear of the lining and generation of rubbing noise by forcibly pulling back from the side surface of the disc rotor.

[0005]

According to the present invention, in accordance with the above object, a pair of operating portions of a caliper body disposed on both sides of a disc rotor are connected by a bridge portion that straddles the outer periphery of the disc rotor. A rigid member is installed in the disc axial direction in a ceiling opening that penetrates the bridge portion inward and outward in the disc radial direction, and a pair of friction pads are movable between the acting portions in the disc axial direction with the disc rotor interposed therebetween. The friction members are arranged so as to face each other, and the inner surfaces of the discs of the friction pads are supported by pad receiving pieces having elastic force, and the disc outer surfaces of both friction pads are urged outward by the pad receiving pieces. In the vehicle disc brake supported by the inner surface of the disc, the inner surface of the disc of the rigid member is gradually displaced as the distance from the disc rotor increases. It is inclined away from the axis. In addition to the above configuration, the pad receiving piece can be inclined so as to gradually approach the disc axis as it moves away from the disc rotor.

With this structure, the friction pad during braking moves in the disc rotor direction while pushing the pad receiving piece inward of the disc radius. The friction pad released from the braking operation is moved from the side surface of the disk rotor to the side opposite to the disk rotor by the pad receiving piece that is restored to the outside of the disk and the inner surface of the disk of the rigid member and the inclined shape of the pad receiving piece. It is forcibly returned.

[0007]

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

1 to 4 show a first embodiment of the present invention, in which a caliper body 2 used for a disc brake 1 is provided on both sides of a disc rotor 3 which rotates in the direction of arrow A as the vehicle travels forward. The action parts 2a and 2b are arranged in the
The action parts 2a and 2b are provided with two large and small cylinder holes 4 facing each other, and a 4-pot piston facing type in which a large-diameter or a small-diameter piston 5 is housed in these cylinder holes 4, and the caliper body 2 is The vehicle body is radially mounted using the vehicle body mounting holes 2e, 2e formed in the disk radial direction and the mounting bolt formed in the one action portion 2a on the vehicle body mounting side together with the union hole 2d.

The acting portion 2a on the mount side and the acting portion 2b on the opposite mount side are connected by a bridge portion 2c straddling the outer periphery of the disk rotor 3, and a rectangular ceiling opening portion is formed in the central portion of the bridge portion 2c. 6 is provided penetrating inside and outside. Working portion 2a and working portion 2b in which the cylinder hole 4 opens
On the disc rotor side, pad mounting recesses 2f, 2f are continuously provided so as to be flush with the inner surface of the ceiling opening 6, and a pair of friction pads 7, 7 are provided in these pad mounting recesses 2f, 2f. It is arranged so as to be movable in the disc axial direction with the disc rotor 3 interposed therebetween.

The piston 5 has its tip protruding from the cylinder hole 4 to the pad mounting recess 2f, and is held in the cylinder hole 4 through a corner seal 8 so as to be liquid-tight and movable.
A hydraulic chamber 9 is defined between each piston 5 and the bottom of the cylinder hole 4. The four hydraulic chambers 9 are the action parts 2a, 2
2 adjacent to each other in b communicate with each other through the liquid passage hole 10,
Further, the two facing each other on the disc payout side are communicated with each other by an external liquid passage pipe 11 which is arranged so as to straddle the outside of the disc rotor 3. First, the above-mentioned union hole 2d communicates.

Each friction pad 7 is constructed by joining a metal back plate 12 pressed by the piston 5 and a lining 13 which is in sliding contact with the side surface of the disk rotor 3 under the pressure of the piston 5, 12 disc inner and outer side surfaces 12a,
The pad 12b is elastically supported by the pad receiving pieces 14a, 14a, the elastic bending portion 14b, and the rigid member 15 which will be described later. At the time of maintenance or pad replacement, the rigid member 15 is detached through the ceiling opening 6. To be done.

A pad mounting recess 2f serving as a torque receiving surface,
A thin plate retainer 14 is provided in close contact with the disc inflow side and the outflow side face of 2f to smoothly guide the friction pad 7 in the disc axial direction at the time of braking and releasing the brake, and the back plate 12 at the time of braking. Support the side of. The retainers 14, 14 facing each other across the disc rotor 3 are integrally connected to the outside of the disc rotor 3, and are arranged along the disc entrance side and the exit side face of the ceiling opening 6. The above-mentioned pad receiving pieces 14a are respectively provided at the inner ends of the retainer 14 on the inner side of the disk. Pad receiving pieces 14a, 14 on the disk entry side and the entry side of the pad mounting recess 2f
a respectively projects inward of the pad mounting recess 2f,
The friction pad 7 is urged to the outside of the disc by the elastic force of the elastic curved portion 14b that bulges between the retainer 14 and both corners of the disc inner surface 12a of the back plate 12.

The rigid member 15 has ridges 15a, 15a having a rectangular cross section which bulges downward at both left and right sides in the longitudinal direction.
Is formed by a wide band material in which the bolt insertion holes 15b, 15b are formed.
Two mounting bolts 16 and 16 are inserted into b and 15b to bridge the ceiling opening 6 in the disc axial direction to enhance the rigidity of the bridge portion 2c which is hollowed out from the ceiling opening 6 to increase the ridge 15a. , 15a lower surface of the rigid member 15
The disk outer surface 12b of the back plate 12 is supported on the disk inner surfaces 15c and 15c.

The disk inner surface 15 of the rigid member 15
c and 15c are pad receiving pieces 14a and 1c parallel to the disc axis when the rigid member 15 is installed in the ceiling opening 6.
4a, gradually deviating from the disc shaft as it moves away from the disc rotor 3, and is gradually V-shaped toward both ends in the longitudinal direction where the bolt insertion holes 15b, 15b are opened with the central portion as a boundary. Pad receiving piece 14a
The friction pad 7 urged by the elastic curved portion 14b is guided in the disc axial direction along the inclined shape of the disc inner surface 15c at the time of braking and releasing the braking.

In this embodiment, which is constructed in this way, the distance between the pad receiving piece 14a and the inner disk surface 15c of the rigid member 15 as viewed from the disk entry side or the entry side is such that the friction pad on the disk rotor 3 side. 7 is narrower than the vertical width of the back plate 12 and expands to the outside of the disc as it moves away from the disc rotor 3. The friction pads 7, 7 when not braking are the inner and outer pad receiving pieces 14a, 14a. With the rigid member 15 and the elastic bending portions 14b, 14b, the elastic member is elastically held without play.

When the driver performs a braking operation, the pressurized hydraulic fluid is supplied to the four hydraulic chambers 9 through the union hole 2d, the liquid passage hole 10 and the liquid passage pipe 11, and the respective pistons 5 are made into cylinder holes. 4 is moved forward, both friction pads 7, 7 are pushed, the linings 13, 13 are brought into sliding contact with both side surfaces of the disk rotor 3, and a braking action is performed.

The friction pad 7 which is pressed by the piston 5 at the time of braking slides the disk outer surface 12b of the back plate 12 to the disk inner surfaces 15c and 15c of the rigid member 15 and elastically bends the pad receiving pieces 14a and 14a. It moves in the direction of the disc rotor while pushing and expanding the inside of the disc against the bias of the portion 14b. Then, when the above-mentioned braking operation is released and the piston 5 retracts to the position before the start of braking, the elastic bending portion 14b having the increased biasing force due to the expansion of the pad receiving piece 14a moves the pad receiving piece 14a to the outside of the disk. The friction pad 7 is strongly urged so that the disc outer surface 12 of the back plate 12
b is the inner surface 15c, 15c of the disk of the rigid member 15 that is inclined so as to spread in the opposite direction of the disk rotor 3.
And is forcibly separated from the side surface of the disk rotor 3 while being guided by.

In this embodiment, the friction pad 7 is
Inner and outer pad receiving pieces 14a, 14a and rigid member 1
5 and the elastic bending portions 14b and 14b always elastically play without rattling, while when the braking operation is released, the elastic bending portion 14b and the inclined shape of the disk inner side surfaces 15c and 15c of the rigid member 15 Since the friction pad 7 is forcibly pulled back from the side surface of the disc rotor 3, it is possible to effectively prevent the uneven wear of the lining 12 and the generation of rubbing noise.

FIGS. 5 and 6 show a second embodiment of the present invention, in which both corners of the disk inner side surface 12a of the back plate 12 are formed on the disk entry side and the exit side of the pad mounting recesses 2f, 2f, respectively. The pad receiving piece 20 to be supported is a separate piece separated from the retainer 14, and urges the friction pads 7 and 7 to the outside of the disk between the pad receiving piece 20 and the mounting portion screwed to the operating portions 2a and 2b. It has an S-shaped elastic bending portion 20a.

The pad receiving pieces 20 mounted on the operating portions 2a and 2b are moved away from the disc rotor 3 as they move away from each other.
The distance between the pad receiving piece 20 and the disk inner side surfaces 15c, 15c of the rigid member 15 inclined similarly to the first embodiment is such that the friction pad 7 is inclined on the disk rotor 3 side. The width is narrower than the vertical width of the back plate 12 and is tapered inward and outward as the distance from the disc rotor 3 increases.

In this embodiment, since both the pad receiving piece 20 for sandwiching the back plate 12 of the friction pad 7 from the inside and outside and the disk inner side surfaces 15c, 15c of the rigid member 15 are inclined, the friction for releasing the braking operation is obtained. The pad 7 can be more reliably separated from the side surface of the disk rotor 3 by the biasing force of the elastic bending portion 20a.

In the above embodiment, the inner surface of the disc of the rigid member is continuous with a gentle V-shaped inclination.
The inclination of the inner surface of the disc of the rigid member may be at least as long as the friction pad moves in the disc axial direction, and may be provided separately in both acting portions. Further, as the inner surface of the disk of the rigid member, the lower surface of the ridge portion is used in the embodiment, but the entire flat lower surface of the rigid member may be used.

[0023]

According to the present invention, the inner surface of the disc of the friction pad is supported by the pad receiving piece having an elastic force, and the outer surface of the disc of the friction pad is erected in the ceiling opening of the caliper body. The inner surface of the disc of the rigid member is gradually tilted away from the disk axis as it moves away from the disk rotor, so that the friction pad after braking is released from the pad receiving piece. The biasing force and the inclined member inner side surface shape of the rigid member forcefully pull back from the side surface of the disk rotor, so that the friction pad lining is dragged to the disk rotor, causing uneven wear and generating rubbing noise. It is possible to solve the conventional problems such as. Further, since no special member for pulling back the friction pad is used, the assembling property and the product cost are excellent. In addition to the above-mentioned configuration, the friction pad can be more reliably pulled back from the side surface of the disk rotor by inclining the pad receiving piece so as to gradually approach the disk axis as the pad receiving piece moves away from the disk rotor.
It is possible to effectively prevent uneven wear of the lining and generation of rubbing noise.

[Brief description of drawings]

FIG. 1 is a sectional view taken along line I-I of FIG. 3 showing a first embodiment of the present invention.

FIG. 2 is a partial cross-sectional plan view of a caliper body showing a first embodiment of the present invention.

FIG. 3 is a sectional view taken along the line III-III of FIG. 2, showing a first embodiment of the present invention;

FIG. 4 is a perspective view of a rigid member showing a first example of the present invention.

FIG. 5 is a sectional front view of a caliper body showing a second embodiment of the present invention.

FIG. 6 is a sectional view taken along the line VI-VI of FIG. 5, showing a second embodiment of the present invention;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Disc brake 2 ... Caliper body 2a, 2b ... Action part 2c ... Bridge part 2f ... Pad mounting recess 3 ... Disc rotor 4 ... Cylinder hole 5 ... Piston 6 ... Ceiling opening 7 ... Friction pad 9 ... Hydraulic chamber 12 ... Back plate 12a of friction pad 7 ... Disk inner side surface of back plate 12b 12 Disk outer surface of back plate 12 13 ... Friction pad 7 lining 14 ... Retainer 14a ... Pad receiving piece integrated with retainer 14 14b ... Pad receiving piece 14a Elastic bending portion 15 ... Rigid member 15a ... Ridge portion of rigid member 15 15c ... Disc inner surface of rigid member 15 ... Mounting bolt 20 ... Pad receiving piece 20a ... Elastic bending portion of pad receiving piece A ... Disk rotor 3 Rotation direction

Claims (2)

[Claims] 1. A ceiling in which a pair of operating portions of caliper bodies disposed on both sides of a disc rotor are connected by a bridge portion that straddles the outer periphery of the disc rotor, and the bridge portion penetrates inward and outward in the disc radial direction. A rigid member is installed in the opening in the axial direction of the disc, and a pair of friction pads are arranged between the two acting portions so as to be movable in the axial direction of the disc with a disc rotor interposed therebetween. A disc brake for a vehicle, which is supported by a pad receiving piece having elastic force, and the disc outer surfaces of both friction pads which are urged outward by the pad receiving piece are supported by the disc inner surface of the rigid member. In the above, the inner surface of the disk of the rigid member is inclined so as to be gradually separated from the disk axis as the distance from the disk rotor increases. The friction pad return structure of the vehicle disc brake. 2. The friction pad returning structure for a vehicle disc brake according to claim 1, wherein the pad receiving piece is inclined so as to gradually approach the disc shaft as it goes away from the disc rotor.