JP4221342B2 - Vehicle disc brake - Google Patents

Description

  The present invention relates to a pin slide type vehicle disc brake used for vehicles such as automobiles and motorcycles, and more particularly, to a structure of an electrolytic corrosion prevention shim interposed between a slide pin support arm and a slide pin provided in an action portion. About.

  The pin slide type vehicle disc brake includes an action portion having a cylinder hole disposed on one side of the disc rotor, and a reaction portion having a reaction force claw disposed on the other side of the disc rotor. Is supported by a caliper bracket fixed to the vehicle body at one side of the disc rotor so that it can slide in the axial direction of the disc via a slide pin. ing.

In the case of using a caliper body formed of aluminum or an aluminum alloy in order to reduce the weight, a slide pin formed of a steel material is projected through a spacer on a slide pin support arm provided in an action portion of the caliper body. In some cases, the caliper body is slidably supported in the disk axial direction by inserting the slide pin through a slide pin insertion arm of a caliper bracket fixed to the vehicle body. The spacer has the same or higher hardness as the slide pin material, and even if the caliper body is made of a soft material such as aluminum or aluminum alloy, the slide pin support arm is deformed by the contact of the slide pin. (For example, refer to patent literature).
Japanese Utility Model Publication No. 4-30327

  However, although the slide pin support arm can be prevented from being deformed by the slide pin due to the spacer, the slide pin support arm, the spacer, and the slide pin are formed of different metals, so that there is a possibility of electric corrosion. It was. Also, when assembling, while holding the spacer by hand, the fixing bolt must be inserted into the spacer and the slide pin support arm, and the slide pin must be attached to the slide pin support arm, which takes time. It was.

  Therefore, in the present invention, when the caliper body and the slide pin are formed of different metals, in particular, when the caliper body is formed of aluminum or an aluminum alloy and the slide pin is formed of a steel material, the slide pin support arm erodes, An object of the present invention is to provide a vehicular disc brake that can be prevented from being deformed by contact with a slide pin and that can be improved in assembling.

In order to achieve the above object, the present invention provides a bridge portion straddling the outside of a disk rotor between an action portion arranged on one side portion of the disk rotor and a reaction portion arranged on the other side portion of the disk rotor. The caliper body that is integrally connected to the caliper bracket is fixed to the caliper bracket that is fixed to the vehicle body, and is slidably supported in the disc axial direction via the slide pin that is mounted on the slide pin support arm provided in the operating portion. In the brake, the slide pin is formed of a metal different from the caliper body, and an electric corrosion prevention shim is interposed at a contact portion between the slide pin support arm and the slide pin, and the electric corrosion prevention shim Forms a pair of elastic claw pieces that engage the outside and inside of the disk radial direction of the slide pin support arm, and a positioning piece that contacts the outside of the disk rotation direction , The elastic claw piece and the positioning piece, the assembly direction of the length of the slide pin support arms are formed substantially the same width dimension, than the width dimension of the width of the elastic claw piece and the positioning piece It is also characterized by a large formation .

  Since the electrolytic corrosion preventing shim is interposed in the contact portion between the slide pin support arm and the slide pin, the slide pin support arm can be prevented from being deformed or being subjected to electrolytic corrosion due to the contact with the slide pin. Also, the electric corrosion prevention shim is prevented from falling off by two claws in the radial direction of the disc, and positioning at the time of assembly can be performed by the claws on the outer side of the disc rotation direction. The assembling property of the shim and the slide pin can be improved.

  In addition, the electric corrosion prevention shim can obtain sufficient engagement force to the slide pin support arm by making the width of the elastic claw piece larger than the width of the positioning piece. Good.

  Hereinafter, an embodiment of the present invention will be described in detail with reference to the drawings. 1 is a partial cross-sectional plan view of a disc brake, FIG. 2 is a cross-sectional view of an essential part, FIG. 3 is a cross-sectional view of III-III in FIG. 2, FIG. 4 is a cross-sectional view of IV-IV in FIG. FIG. 6 is a sectional view taken along line VI-VI in FIG. 7, and FIG. 7 is a front view of the caliper body.

  An arrow A in the figure indicates the rotational direction of the disc rotor during forward traveling of the vehicle, and the disc brake turn-in side and the outlet side used in the following description are for forward travel of the vehicle.

  The pin slide type vehicle disc brake 1 includes a caliper body 3 in which an action portion 3a and a reaction portion 3b arranged to face each other with a disc rotor 2 interposed therebetween are integrally connected by a bridge portion 3c straddling the outside of the disc rotor 2. A caliper bracket 4 fixed to the vehicle body at one side of the disc rotor 2 is supported by a pair of slide pins 5 so as to be movable in the disc axial direction, and the disc rotor is interposed between the action portion 3a and the reaction portion 3b. A pair of friction pads 6 and 6 are opposed to each other with 2 interposed therebetween.

  The caliper bracket 4 includes a vehicle body fixing portion 4a disposed on one side surface portion of the disk rotor 2, and a pair of members extending from both ends of the vehicle body fixing portion 4a and straddling the outer periphery of the disk rotor 2 in the disk axial direction. And a slide pin insertion arm 4b. The slide pin insertion arm 4b includes a pair of friction pad holding portions 4c on the vehicle body fixing portion side and a tip of the friction pad holding portion 4c on the vehicle body fixing portion side across the outer side of the disk rotor 2 in the disk axial direction. A pair of protruding slide pin insertion portions 4d, and a pair of frictions on the side opposite to the vehicle body fixing portion protruding in the inner circumferential direction of the disk rotor from the protruding end of the slide pin insertion portion 4d along the other side surface portion of the disk rotor 2. It has a pad holding part 4c and a tie rod 4e that connects the disk rotor inner peripheral side ends of the pair of friction pad holding parts 4c on the side opposite to the car body fixing part, and the car body fixing part 4a, friction pad holding The portion 4c, the slide pin insertion portion 4d, and the tie rod 4e are formed in a substantially U shape that bypasses both sides of the friction pad 6 and the inner peripheral side of the disk rotor as a whole. Fastening bolt mounting portions 4f each having a female screw hole for screwing a mounting bolt for mounting the vehicle body are provided at both end portions of the vehicle body fixing portion 4a. Are provided with pad guide grooves 4g in the disk axial direction so as to face each other. Each slide pin insertion portion 4d is formed in a linear shape with a length extending from the reaction portion 3b side to the action portion 3a. Inside the slide pin insertion portion 4d, a bag-like pin insertion hole 4h is provided on the action portion side. The opening is provided.

  The caliper body 3 is made of an aluminum alloy, and the action part 3a is provided with a bottomed cylinder hole 7 opened on the disk rotor 2 side, and the reaction part 3b is provided from the action part side. A reaction force claw 3d that pushes the friction pad 6 on the reaction portion side by a reaction force is provided. The bridge portion 3c is provided with a window portion 3e for confirming the wear state of the friction pad 6 from the outside at the center. A cup-shaped piston 8 is slidably inserted into the cylinder hole 7 via a piston seal 9. The piston 8 is moved in the cylinder hole 7 toward the disk rotor by the pressurized liquid supplied via the union hole 11 to the hydraulic chamber 10 defined between the piston 8 and the bottom of the cylinder hole 7. The friction pad 6 on the action part side is pushed toward one side surface of the disk rotor 2. A pair of slide pin support arms 3f are provided to project linearly along one side surface of the disk rotor 2 on the disk rotor turn-in side and the turn-out side of the action portion 3a. The insertion holes 3g of the fixing bolts 12 are respectively drilled.

  Each friction pad 6 includes a lining 6a that is in sliding contact with the side surface of the disk rotor 2, and a metal back plate 6b that holds the lining 6a. The back plate 6b is provided with ear pieces 6c projecting on both sides, and the friction pads 6 can be slid in the disk axial direction by inserting the ear pieces 6c into the pad guide grooves 4g via the pad retainers 13. Supported by

  Each slide pin 5 is made of steel and includes a large diameter flange portion 5a and a small diameter shaft portion 5b. A female screw hole 5c into which the fixing bolt 12 is screwed is formed at one end of the slide pin 5 provided with the large-diameter flange portion 5a. A dust boot 14 is provided between the disk rotor side surface of the large-diameter flange portion 5a and the slide pin insertion arm 4b to prevent dust and water from entering the pin insertion hole 4h.

The electric corrosion prevention shim 15 is formed by coating a metal thin plate with an anticorrosive agent, and is mounted on the side of the disk rotor of the slide pin support arm 3f, and has the through hole 15a of the fixing bolt 12 in the center. A base portion 15b, a pair of elastic claw pieces 15c and 15c that engage with the outer side and the inner side of the slide pin support arm 3f in the disk radial direction, and a positioning piece 15d that contacts the outer side in the disk rotation direction are provided. The elastic claw pieces 15c and 15c and the positioning piece 15d are formed to have substantially the same length in the direction of assembly to the slide pin support arm 3f, and the width dimension of the elastic claw pieces 15c and 15c is the positioning piece. It is formed larger than the width of 1 5d.

  The electric corrosion prevention shim 15 is positioned by bringing the positioning piece 15d into contact with the end surface of the slide pin support arm 3f on the disk insertion / retraction side, and the pair of elastic claw pieces 15c, 15c is used to position the slide pin support arm 3f. It is assembled in advance to the slide pin support arm 3f by engaging with the outer side and the inner side in the disk radial direction. The tip end surface of the large-diameter flange portion 5a of the slide pin 5 is superimposed on the slide pin support arm 3f via the electrolytic corrosion prevention shim 15, and the insertion hole 3g of the slide pin support arm 3f and the electrolytic corrosion prevention shim 15 The positions of the through hole 15a and the female screw hole 5c of the slide pin 5 are aligned, and the fixing bolt 12 is inserted from the opposite side of the disk rotor of the slide pin support arm 3f and screwed into the female screw hole 5c, whereby the slide pin 5 is fixed to the fixing bolt. 12 are attached in directions parallel to the disk axis. The small-diameter shaft portion 5b of the slide pin 5 is inserted into the pin insertion hole 4h of the caliper bracket 4 so as to be movable in the disk axis direction, and the caliper body 3 is moved by sliding between the slide pin 5 and the pin insertion hole 4h. The caliper bracket 4 can move in the disk axial direction.

  In this way, the electric corrosion prevention shim 15 is attached between the slide pin support arm 3f and the large diameter flange portion 5a of the slide pin 5, whereby the caliper body 3 is formed of an aluminum alloy, and the slide pin 5 is Even if it is made of steel, it can prevent the contact portion between the slide pin 5 and the slide pin support arm 3f of the caliper body 3 from being eroded, and the slide pin support arm 3f made of a soft material It is also possible to prevent deformation due to contact with the slide pin. In addition, the electric corrosion prevention shim 15 can be assembled in advance at a predetermined position of the slide pin support arm 3f by the elastic claw pieces 15c and 15c and the positioning piece 15d at the time of assembly. The assembling property of the arm 3f, the electric corrosion prevention shim 15, and the slide pin 5 can be improved. Further, since the electric corrosion prevention shim 15 is formed so that the width of the elastic claw pieces 15c, 15c is larger than the width of the positioning piece 15d, sufficient engagement force to the slide pin support arm 3f is obtained. In addition, the assembling property of the electric corrosion prevention shim 15 is improved.

  In addition, it is possible to prevent electric corrosion of the slide pin support arm more reliably by interposing a washer or the like for preventing electric corrosion between the fixing bolt and the slide pin support arm.

It is a partial cross section top view of the disc brake which shows one example of the present invention. It is a principal part sectional drawing similarly. FIG. 3 is a sectional view taken along line III-III in FIG. 2. It is IV-IV sectional drawing of FIG. It is a perspective view of the electric corrosion prevention shim. It is VI-VI sectional drawing of FIG. It is a front view of a caliper body.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... Disc brake, 2 ... Disc rotor, 3 ... Caliper body, 3a ... Action part, 3b ... Reaction part, 3c ... Bridge part, 3d ... Reaction force nail, 3e ... Window part, 3f ... Slide pin support arm, 3g ... Insertion hole, 4 ... caliper bracket, 4a ... body fixing part, 4b ... slide pin insertion arm, 4c ... friction pad holding part, 4d ... slide pin insertion part, 4e ... tie rod, 4f ... fastening bolt mounting part, 4g ... pad Guide groove, 4h ... pin insertion hole, 5 ... slide pin, 5a ... large diameter flange, 5b ... small diameter shaft, 5c ... female screw hole, 6 ... friction pad, 6a ... lining, 6b ... back plate, 6c ... ear piece 7 ... Cylinder hole, 8 ... Piston, 9 ... Piston seal, 10 ... Hydraulic chamber, 11 ... Union hole, 12 ... Fixing bolt, 13 ... Pad retainer, 14 ... Dust boot, 15 ... Electric corrosion prevention , 15a ... through hole, 15b ... base, 15c ... elastic claw piece, 15d ... positioning piece

Claims (1)

A caliper body in which an action part arranged on one side of the disk rotor and a reaction part arranged on the other side of the disk rotor are integrally connected by a bridge part that straddles the outside of the disk rotor. In a vehicle disc brake that is slidably supported in a disc axial direction via a slide pin mounted on a slide pin support arm provided on the action portion, the caliper bracket is fixed to the caliper bracket. Formed with different metals, and an electric corrosion prevention shim is interposed at the contact portion between the slide pin support arm and the slide pin, and the slide pin support arm has a radially outer side and an inner side of the slide pin support arm. a pair of elastic claws that engage the form and positioning piece abutting the disk rotation direction outward, the elastic claw piece and the positioning pieces The assembling direction of the length of the slide pin support arms are formed substantially the same width dimension, and characterized by being larger than the width dimension of the width of the elastic claw piece and the positioning piece Disc brake for vehicles.

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