JPH07317816A - Disc type car brake pad retainer integrated with bracket shim - Google Patents

Abstract

PURPOSE:To enhance the easiness in the pad retainer installing work by preventing electrocorrosion through utilization of a pad retainer, wherein the corrosion is caused by different metals used in the car body mounting bracket of a callipers body and the callipers mounting part on the car body side. CONSTITUTION:A bracket shim 12d is formed integratedly on a pad retainer 12 interposed between a friction pad 9 and a torque reception part of a callipers body 2. Detent pieces 12g, 12g are installed on the bracket shim 12d. The bracket shim 12d is pinched by a car body mounting bracket 2f and callipers mounting part 7a which are made from different metals, and the detent pieces 12g, 12g are fixed to the bracket 2f, and the pad retainer 12 is installed in place rigidly, and a bushing 18 is prevented from slipping off. The bracket shim 12d at least including detent pieces 12g, 12g is made from a nonconductive material or subjected to a non-conductivity processing on the surface.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pad retainer integrated with a bracket shim used in a piston facing type caliper body of a disc brake for vehicles such as automobiles and motorcycles.

[0002]

2. Description of the Related Art As a conventional general piston facing type caliper body, for example, there is one disclosed in Japanese Utility Model Publication No. 6-11374. This caliper body has a cylinder hole that opens to the side surface of the disk rotor at both action portions of the caliper body that is arranged on both sides of the disk rotor, and a disk rotor side at the disk entry side and the exit side of the cylinder hole. Providing a protruding torque receiving portion facing each other,
A friction pad is arranged between the torque receiving parts of each action part via a pad retainer, and the vehicle body mounting bracket provided on one of the action parts is screwed to the caliper attachment part on the vehicle body side. Be connected.

[0003]

In such a structure, when different metals are used for the caliper body and the caliper mounting portion on the vehicle body side, the caliper body's vehicle body mounting bracket and the vehicle body side caliper mounting portion are separated from each other. Electrolytic corrosion caused by the potential difference of dissimilar metals is generated on the joint surface of, and the product value is impaired, and when reassembling the caliper body that has been removed for maintenance, etc., the caliper body may be installed at an angle. May cause the problem of.

Therefore, an object of the present invention is to prevent electric corrosion due to dissimilar metals on the vehicle body mounting bracket of the caliper body and the caliper mounting portion on the vehicle body side by using the pad retainer, and to improve the assembling property of the pad retainer. I am trying.

[0005]

In order to achieve the above-mentioned object, the present invention has a cylinder hole opening to the side surface of a disk rotor in both working portions of a caliper body disposed on both sides of the disk rotor, and the cylinder. Torque receiving portions protruding toward the disc rotor side are provided on the disc turning-in side and the feeding side of the hole so as to face each other, and friction pads are arranged between the torque receiving portions of the respective action portions via pad retainers, respectively. In one of the action parts, a vehicle body mounting bracket connected to the caliper mounting portion on the vehicle body side is provided, and in the vehicle disc brake in which the vehicle body mounting bracket and the caliper mounting portion are formed of different metals, the pad retainer is provided. , A bracket shim that is sandwiched between the vehicle body mounting bracket and the caliper mounting portion is integrally formed, and the pad retainer and the bra A locking piece to be engaged with the action portion or the vehicle body mounting bracket is formed on either one of the contact shims, and the bracket shim is formed of a non-conductor or the surface of the bracket shim is subjected to a non-conductor treatment. I am trying.

[0006]

According to this structure, the pad retainer is laid on the torque receiving surface by engaging the locking piece formed on either the pad retainer or the bracket shim with the action portion of the caliper body or the vehicle body mounting bracket. Then, the bracket shim is brought into close contact with the side surface of the caliper mounting portion of the vehicle body mounting bracket, and is simultaneously assembled to the caliper body before the vehicle body is assembled. The non-conductive or non-conductive bracket shim is sandwiched between the car body mounting bracket and the caliper mounting part when the caliper body is assembled to the car body, and is mounted between the car body mounting bracket and the caliper mounting part made of dissimilar metals. Prevent electrolytic corrosion.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A first embodiment of the present invention will be described below with reference to FIGS.
It will be described based on.

The caliper body 2 used for the disc brake 1 is divided into a pair of caliper halves 2a and 2b at the center of a bridge portion 2e straddling the outer periphery of the disc rotor 3 and arranged on both sides of the disc rotor 3. Cylinder holes 4 and 4 that open to the side surface of the disk rotor are formed opposite to the action portions 2c and 2d of the caliper halves 2a and 2b, respectively, and the piston 5 is liquid-tightly and movable inside each of the cylinder holes 4 and 4. Inserted piston facing type, caliper halves 2a, 2
b is connected integrally to both side portions of the bridge portion 2e on the disc entry side and the delivery side by screwing two connecting bolts 6 and 6 in the disc axial direction, and is integrally formed on one acting portion 2c. Rectangular body mounting brackets 2f, 2f
Are fastened to the caliper mounting portions 7a, 7a on the vehicle body 7 side with the mounting bolts 8, 8 so that the caliper body 2 is attached to the vehicle body 7
Be assembled into.

The caliper body 2 includes caliper halves 2a,
By using a light metal such as an aluminum alloy or a titanium alloy for 2b, the weight of the vehicle body 7 is reduced and the unsprung load is reduced. One caliper mounting portion 7a, 7a is provided with a conventional cast iron. For example, a metal different from the caliper body 2 is used to secure the support rigidity of the caliper body 2.

The action portions 2c and 2d are provided with torque receiving portions 2g and 2g, which protrude toward the disc rotor side, on the disc entry side and the disc exit side with the cylinder hole 4 sandwiched therebetween. Torque receiving portion 2 of each action portion 2c, 2d
g, 2g pad mounting recesses 2h, 2h set between
Further, the friction pads 9 are respectively disposed via the pad retainers 12 and 12 of the bracket shim integrated type.

The friction pad 9 comprises a lining 10 which is in sliding contact with the side surface of the disc rotor 3 and a back plate 11 which is held by a hanger pin 13.
Is supported by the pad receiving pieces 12c and 12c of the pad retainer 12 on both sides of the inner peripheral surface of the disk of each back plate 11, and the pin hole 1 formed through the upper hanging piece 11a of the back plate 11 is formed.
A hanger pin 13 that extends over the outer side of the disc rotor 3 in the disc axial direction and extends over the action portions 2c and 2d is inserted into the 1b, and is movably suspended in the disc axial direction.

At the center of the bridge portion 2e, the ceiling opening 2
i is provided so as to communicate with the inner pad mounting recesses 2h, 2h. The ceiling opening 2i has the same length as the distance between the disk receiving and feeding side torque receiving portions 2g, 2g in the disk circumferential direction, and the same as the distance between both cylinder opening surfaces 2j, 2j in the disk axial direction. The friction pads 9 are formed in a rectangular shape having a width, and are mounted in the pad mounting recess 2h, and are inserted and removed through the ceiling opening 2i.

A hydraulic chamber 14 is defined between the bottom of the cylinder hole 4 and the piston 5, and the hydraulic chambers 14 and 14 of both working portions 2c and 2d are discs on the disc entry side of the caliper body 2. The rotor 3 is communicated with a liquid passage pipe 15 arranged so as to straddle the outer periphery of the rotor 3. One acting part 2 on the vehicle body mounting side
In c, an inlet port 16 is provided so as to communicate with the hydraulic chamber 14 at a boss portion 2m projecting to the side opposite to the disc rotor,
A bleeder screw 17 is screwed into a bleeder hole (not shown) provided in the action portions 2c and 2d so as to communicate with the hydraulic chamber 14.

A well-known hydraulic master cylinder, which is separately provided, is connected to the inlet port 16 by a brake hose (neither is shown), and the pressure generated in the hydraulic master cylinder by the driver's brake operation is connected. The liquid is supplied from the inlet port 16 to the hydraulic chamber 14 of the one acting portion 2c. A part of the pressure liquid introduced into the hydraulic chamber 14 of the action portion 2c is supplied to the hydraulic pressure chamber 14 of the other action portion 2d through the liquid passage pipe 15 and by the pressure liquid that expands the hydraulic pressure chambers 14, 14. The pistons 5 and 5 are advanced to bring the linings 10 and 10 of both friction pads 9 and 9 into sliding contact with both side surfaces of the disc rotor 3 to perform a braking action.

The pad retainer 12 includes a pair of torque receiving pieces 12a, 12a arranged in parallel at a predetermined interval, a connecting piece 12b connecting one end of each of the torque receiving pieces 12a, 12a, and the other end of the torque receiving pieces 12a, 12a. From the above-mentioned pad receiving pieces 12c, 12c bent at a right angle, and the caliper body 2 is attached to one torque receiving piece 12a.
A bracket shim 12d that is sandwiched between a vehicle body mounting bracket 2f of the body 2 and a caliper mounting portion 7a of the vehicle body 7 when the vehicle body 7 is assembled to the vehicle body 7 is integrally formed.

The bracket shim 12d is a rectangular plate projecting from the vicinity of the other end of the one torque receiving piece 12a and bent at the tip of the connecting piece 12e in a direction orthogonal to the torque receiving piece 12a. A through hole 12f is formed in the hole, and a pair of locking pieces 12g, 12g each having a U-shaped claw piece 12h at its tip end are formed in parallel on both side edges. The bracket shim 12d including at least the locking pieces 12g and 12g is formed of a heat-resistant non-conductive material such as synthetic resin or ceramic, or has a non-conductive material such as a zinc dust alloy coating, a ceramic coating, or a synthetic resin coating on the surface. Although processed, the bracket shim 12d to the pad retainer 12
The entire component including the above may be formed of a non-conductor or the surface thereof may be treated with a non-conductor. As a result, when the caliper body 2 is assembled to the vehicle body 7, the bracket shim 12d is sandwiched between the vehicle body mounting bracket 2f and the caliper mounting portion 7a, and the body mounting bracket 2f and the caliper mounting portion 7a are made of different metals. The occurrence of electrolytic corrosion due to the potential difference is prevented.

The vehicle body mounting bracket 2f of the caliper body 2 is provided with a bolt insertion hole 2n and a bush mounting hole 2o having a diameter larger than that of the bolt insertion hole 2n, and is provided near the opening of the bush mounting hole 2o. Has a step portion 2p, and a bush 18 is attached to the step portion 2p side.
The bush 18 includes a cylindrical boss portion 18a and the boss portion 1
8a and a rectangular flange 18b that encloses one end side of the boss portion 18a. A female screw hole 18c is formed on the inner circumference of the boss portion 18a. A peripheral edge is formed between the outer peripheral edge of the flange 18b and the one end side of the boss portion 18a. A groove 18d is formed. Further, as the material of the bush 18, a steel material having hardness similar to that of the connecting bolt 8 is used, and when the male screw 8a of the mounting bolt 8 is screwed into the female screw hole 18c when the caliper body 2 is assembled to the vehicle body. Moreover, the female screw hole 18c is prevented from being damaged.

In this embodiment having such a structure, the bush 18 has one side edge of the flange 18b attached to the step portion 2 of the vehicle body mounting bracket 2f before the caliper body 2 is assembled to the vehicle body.
The boss portion 18a is loosely inserted into the bush mounting hole 2o of the vehicle body mounting bracket 2f while being brought into contact with p. Next, the locking pieces 12g, 12g of each bracket shim 12d are inserted from the side opposite to the bush of the vehicle body mounting bracket 2f to both sides of the mounting bracket 2f and the flange 18b of the bush 18 to fix the tips of the locking pieces 12g, 12g. 12h nail,
By dropping 12h into the circumferential groove 18d of the bush 18, the mounting bracket 2f and the bush 18 are engaged with each other by the locking piece 1.
The bush 18 is held by 2g and 12g to prevent the bush 18 from coming off, and the bracket shim 12d is attached in close contact with the side surface of the caliper mounting portion of the vehicle body mounting bracket 2f.

Further, by mounting the bracket shim 12d, the connecting piece 12b of the pad retainer 12 is brought into close contact with the disk entry side or exit side of the ceiling opening 2i while straddling the outer periphery of the disk rotor 3 and The torque receiving portions 12a, 12a are opposed to both sides of the disk rotor 3 on the disk turn-in or turn-out side.
Is laid in.

The pad mounting recess 2h of the caliper body 2
The friction pads 9, 9 are mounted on the 2h as described above, and the caliper body 2 assembled with them has the vehicle body mounting brackets 2f, 2f mounted on the disc rotor side of the caliper mounting portion 7a of the vehicle body 7, respectively. Sim 12
superimposed via d. Next, attach the mounting bolt 8
From the side of the caliper mounting portion 7a, insert into the bolt insertion hole 7b of the mounting portion 7a, the through hole 12f of the bracket shim 12d, and the bolt insertion hole 2n of the vehicle body mounting bracket 2f, and attach the male screw 8a at the tip of the mounting bolt 8 to the bush. 1
The caliper body 2 is assembled to the vehicle body 7 by screwing it into the female screw hole 18c of No. 8. The bush 18 is the flange 1
Since one side edge of 8b is in contact with the step portion 2p of the vehicle body mounting bracket 2f, co-rotation of the bush 18 due to screwing of the mounting bolt 8 is effectively prevented.

In this embodiment, dissimilar metals are used for the caliper body 2 and the caliper mounting portion 7a of the vehicle body 7. However, a non-conductor or a surface is provided between the vehicle body mounting bracket 2f of the caliper body 2 and the caliper mounting portion 7a. Since the bracket shim 12d, which is treated as a non-conductor, is sandwiched, electrolytic corrosion caused by the potential difference between dissimilar metals which has conventionally been generated on these joint surfaces can be effectively prevented. Also, the bracket shim 12d
The body mounting bracket 2f with the locking pieces 12g, 12g
By assembling the pad retainer 12 and the bush 18 at the same time to the predetermined positions of the caliper body 2, the number of assembling steps can be reduced and the workability can be improved. Also, by integrating the bracket shim 12d with the pad retainer 12, the cost can be reduced by reducing the number of parts, and the size of the parts becomes large. There is also the effect of.

FIG. 4 shows a second embodiment of the present invention. The pad retainer 20 includes torque receiving pieces 20a, 20a, connecting pieces 20b and pad receiving pieces 20c, 20c, as in the first embodiment. have. The one pad receiving piece 20c is formed by raising a notch in the vicinity of the other end of the torque receiving piece 20a, and a through hole is formed at the tip of the connecting piece 20e that is bent to project from the other end of the torque receiving piece 20a. A bracket shim 20d including 20f is integrally formed. A locking piece 20g is bent and formed in the opposite direction to the pad receiving pieces 20c, 20c along the entire length of the disk outer edge extending from the connecting piece 20b to both ends of the torque receiving pieces 20a, 20a.
Further, the connecting piece 20 sandwiched between the torque receiving pieces 20a, 20a.
A locking piece 20h is formed on the inner edge of the disk b by bending in parallel with the outer locking piece 20g.

The vehicle body mounting bracket 2f of the caliper body 2 is provided with a bolt insertion hole 2n and a hexagonal hole 2q larger than the bolt insertion hole 2n.
In q, a hexagon nut 2 that replaces the bush 18 of the first embodiment
1 is inserted.

Each pad retainer 20 integrally having the bracket shim 20d has two long and short locking pieces 20g and 20h.
Are fastened to the outer surface and the inner surface of the bridge portion 2e from the ceiling opening portion 2i, so that the torque receiving piece 20a and the pad receiving piece 20c are arranged at predetermined positions similar to those of the first embodiment, and at the same time, the bracket shim. 20d is disposed in close contact with the side surface of the caliper mounting portion of the vehicle body mounting bracket 2f.

Also, at least the bracket shim 20d or the pad retainer 20 from the bracket shim 20d.
The entire parts up to are made of non-conductive material such as heat-resistant synthetic resin or ceramic, or the surface is treated with non-conductive material such as zinc dust alloy coating, ceramic coating or synthetic resin coating. The body mounting bracket 2f and the caliper mounting portion 7 made of dissimilar metals are provided by 20d.
Prevent the occurrence of electrolytic corrosion between a.

[0026]

According to the present invention, a pad retainer for supporting a friction pad by a torque receiving portion of a caliper body with pistons opposed to each other is sandwiched between a vehicle body mounting bracket of a caliper bracket and a caliper mounting portion of a vehicle body side. A bracket shim that is integrally formed with the pad retainer and the bracket shim, and a locking piece that is engaged with the action portion of the caliper body or the vehicle body mounting bracket is formed on either one of the pad retainer and the bracket shim, and the bracket shim is formed of a non-conductor. Or, even if dissimilar metals are used for the caliper body and the caliper mounting part of the vehicle body by applying a non-conductive treatment to the surface of this bracket shim, the bracket shim mounts the car body mounting bracket of the caliper body to the caliper mounting of the vehicle body. Effectively prevent these galvanic corrosion between the parts. Also, by engaging the locking piece provided on either the pad retainer or the bracket shim with the action part or the vehicle body mounting bracket, the other member can be assembled at the same position at the same time, so the number of assembly steps is reduced. As a result, workability can be improved. Furthermore, by integrally forming the bracket shim on the pad retainer, the cost can be reduced by reducing the number of parts, and since the parts shape is large, it is possible to prevent loss, and forget to assemble or misassemble the caliper body. There is no fear of.

[Brief description of drawings]

FIG. 1 is an exploded perspective view of a disc brake mounting main portion showing a first embodiment of the present invention.

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

FIG. 3 is a sectional view taken along line III-III in FIG.

FIG. 4 is an exploded perspective view of an essential part of a disc brake attachment showing a second embodiment of the present invention.

[Explanation of symbols]

1 ... Disc brake 2 ... Caliper body 2a, 2b ... Caliper half 2c, 2d ... Working part 2e ... Bridge part 2f ... Car body mounting bracket 2g ... Torque receiving part 2h ... Pad mounting recess 2i ... Ceiling opening 2j ... Cylinder opening surface 2n ... Bolt insertion hole 2o ... Bush mounting hole 2p ... Step portion that stops bush 18 from rotating 2q ... Hexagonal hole 3 ... Disk rotor 4 ... Cylinder hole 5 ... Piston 7 ... Car body 7a ... Caliper mounting portion of car body 7b ... Caliper mounting Bolt insertion hole of part 7a 8 ... Mounting bolt 9 ... Friction pad 10 ... Lining 11 ... Back plate 12 ... Bracket shim integrated type pad retainer 12a ... Torque receiving pieces 12b, 12e ... Connecting piece 12c ... Pad receiving piece 12d ... Pad retainer Bracket shim 12f integrally formed with 12 ... through hole 12g ... locking 13 ... Hanger pin 14 ... Hydraulic chamber 18 ... Bushing 18a ... Cylindrical boss 18b ... Rectangular flange 18c ... Female screw hole 18d ... Circumferential groove 20 ... Pad retainer integrated with bracket shim 20a ... Torque receiving piece 20b, 20e ... Connecting piece 20c ... Pad receiving piece 20d ... Bracket shim 20f integrally formed with the pad retainer 20 ... Through hole 20g, 20h ... Locking piece 21 ... Hexagon nut

Claims (1)

[Claims] Claim: What is claimed is: 1. A cylinder hole opening to a side surface of a disk rotor in both action portions of a caliper body disposed on both sides of the disk rotor, and a disk rotor side at a disk inlet side and a outlet side of the cylinder hole. A protruding torque receiving portion is provided so as to face each other, and a friction pad is arranged between the torque receiving portions of the respective operating portions via a pad retainer, and one of the operating portions is attached to a caliper mounting portion on the vehicle body side. A disc brake for a vehicle, comprising a vehicle body mounting bracket to be connected, wherein the vehicle body mounting bracket and the caliper mounting portion are made of different metals, and is sandwiched between the vehicle body mounting bracket and the caliper mounting portion on the pad retainer. Bracket shim is integrally formed, and one of the pad retainer and the bracket shim is connected to the acting portion or the vehicle body mounting portion. A bracket shim integrated type pad for a vehicle disc brake, characterized in that a locking piece to be engaged with the mounting bracket is formed, and the bracket shim is formed of a non-conductor or the surface of the bracket shim is subjected to a non-conductor treatment. Retainer.