JP2015148317A - Disk brake for vehicle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a disk brake for vehicle capable of improving assemblability of a pad return spring and reducing its cost.SOLUTION: An engagement hole 6d, with which friction pad engagement part 7c provided at the tip of a pad return spring 7 is engaged, is formed in a rear plate 6a of a friction pad 6. A guide part 14d is formed in a first covering part 14b of a shim plate 14. The guide part 14d includes an opening part 14e formed at a position corresponding to the engagement hole 6d, and a notch part 14g inclinedly notched toward the opening part 14e from a disk rotor side end part 14f of the first covering part 14b.

Description

  The present invention relates to a vehicle disc brake mounted on a traveling vehicle such as an automobile or a motorcycle or a three-wheeled vehicle. More specifically, the present invention relates to a vehicle disc brake provided with a pad return spring that pulls a friction pad back to the non-disc rotor side when braking is released. .

  Conventionally, in a disk brake for a vehicle, a pair of friction pads arranged on both sides of a disk rotor is suspended on the outer side in the disk radial direction by a pad return spring that pulls the pair of friction pads back to the opposite disk rotor side when braking is released. There is. The pad return spring includes a pair of spring portions and a friction pad engaging portion protruding from the tip of the spring portion toward the friction pad, and the friction pad engaging portion is arranged in the disk radial direction of the pair of friction pads. There are some which are installed in the engagement holes that open to the outside, and the spring part is arranged on the outer periphery side of the disc rotor between a pair of friction pads, and the friction pad engagement part is guided to the engagement hole on the back plate of the friction pad Some of them are provided with a guide portion (see, for example, Patent Document 1). Further, a recess is formed on the outer surface in the radial direction of the disk of the friction pad, and a cover for covering the recess is formed on the shim plate disposed on the back plate of the friction pad, and the friction pad of the pad return spring is formed on the cover. There existed what formed the penetration hole which penetrates an engaging part (for example, refer to patent documents 2).

Japanese Utility Model Publication No. 2-92130 Japanese Utility Model Publication No. 5-29545

  However, in the thing of the above-mentioned patent document 1, since the engagement hole and the guide part were formed in the back plate of a friction pad, the processing man-hour of the back plate increased. Moreover, in the thing of patent document 2, since the friction pad engaging part had to be inserted in the small diameter insertion hole formed in the shim board, the assembly | attachment of the pad return spring was troublesome.

  SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a vehicle disc brake capable of improving the assembling property of the pad return spring and reducing the cost.

  In order to achieve the above object, a vehicle disc brake according to the present invention has shim plates attached to the back plates of a pair of friction pads arranged on both sides of a disc rotor, respectively, and on the outer side in the disc radial direction of the friction pads. In the vehicular disc brake in which the pad return spring is suspended to return the pair of friction pads to the side opposite to the disc rotor when the brake is released, a friction pad engaging portion provided at the tip of the pad return spring is engaged with the back plate. A mating engagement hole is formed, and a guide portion for guiding the friction pad engagement portion to the engagement hole is formed on the shim plate.

  The engagement hole is formed in an outer end surface in the disk radial direction of the back plate, and the guide portion is formed in a cover portion that covers the outer end surface in the disk radial direction of the back plate, and the engagement of the cover portion is performed. It is preferable that an opening portion formed at a position corresponding to the hole and a notch portion that is obliquely cut from the disk rotor side end portion of the cover portion toward the opening portion.

  According to the vehicle disc brake of the present invention, the engagement hole for engaging the friction pad engaging portion of the pad return spring is formed in the back plate of the friction pad, and the friction pad engaging portion of the pad return spring is formed in the shim plate. By forming the guide portion that guides the engagement hole to the engagement hole, it is possible to improve the assembling property of the pad return spring while reducing the man-hours for processing the back plate as much as possible and reducing the cost.

  Further, the guide portion formed on the shim plate is formed in a cover portion that covers the disk radial direction outer end surface of the back plate, and an opening portion formed at a position corresponding to the engagement hole, and the disk rotor side of the cover portion Since it is formed with a notch portion formed from the end portion toward the engagement hole, the friction pad engagement portion of the pad return spring can be simply slid along the notch portion. The engaging portion can be guided to the engaging hole satisfactorily. Further, since the guide portion can be formed only by performing simple processing on the shim plate, the cost can be reduced.

1 is a partial cross-sectional plan view of a vehicle disc brake showing an embodiment of the present invention. It is a principal part expanded sectional view of the disk brake for vehicles similarly. It is a principal part top view of a friction pad and a shim board similarly. It is a principal part rear view of a friction pad and a shim board similarly. It is VV sectional drawing of FIG. 1 is a partial cross-sectional rear view of a vehicle disc brake showing an embodiment of the present invention. It is VII-VII sectional drawing of FIG. 1 is a front view of a vehicle disc brake showing an embodiment of the present invention.

  FIG. 1 to FIG. 8 are views showing one embodiment of a vehicle disc brake according to the present invention. An arrow A indicates a rotation direction of a disc rotor that rotates integrally with a wheel when the vehicle moves forward. The disk entry side is assumed to be when the vehicle is moving forward.

  The vehicle disc brake 1 includes a pair of slide pins on the disc rotor 2, a caliper bracket 3 fixed to the vehicle body at one side of the disc rotor 2, and caliper support arms 3 a and 3 a of the caliper bracket 3. A pair of caliper bodies 5 supported so as to be movable in the disk axial direction via 4 and 4, and a pair of opposingly arranged sandwiching the disk rotor 2 inside the action portion 5a and the reaction portion 5b of the caliper body 5. A pad return spring 7 is suspended on the friction pads 6 and 6 to pull back the friction pads 6 and 6 to the side opposite to the disk rotor when braking is released.

  The caliper body 5 includes the above-described action part 5a and reaction part 5b disposed on both sides of the disk rotor 2, and a bridge part 5c that connects these parts across the outer edge of the disk rotor 2, and the action part 5a. Is provided with a cylinder hole 5d having an opening on the disk rotor 2 side. In the cylinder hole 5d, a bottomed cylindrical piston 8 is accommodated via a piston seal 9 and a dust seal 10, and the piston 8 is driven by a hydraulic pressure supplied to a hydraulic pressure chamber 11 defined at the bottom of the cylinder hole. The cylinder hole 5d is moved in the direction of the disk rotor. Further, slide pin mounting arms 5e and 5e are projected from the side of the action portion 5a, and the above-described slide pins 4 are projected from the distal ends of the slide pin mounting arms 5e by mounting bolts 12, respectively. Has been.

  The caliper support arms 3a and 3a straddle the outer edge of the disc rotor 2 from both sides of the caliper bracket 3 while sandwiching both sides of the bridge portion 5c in the disc axial direction, and at the other side of the disc rotor 2, the reaction portion 5b The shape extends along the side wall toward the center of the disk. The distal ends of the caliper support arms 3a and 3a are connected by a tie rod 3b to increase the rigidity of the caliper support arms 3a and 3a to which braking torque is applied.

  Each of the caliper support arms 3a, 3a is formed with a guide hole 3c for receiving the slide pin 4 described above, and both the caliper support arms 3a, 3a face each other on the respective sides of the disc rotor 2. Two pad guide grooves 3d are provided. A pair of pad guide grooves 3d facing each other on the side surface of the disk rotor 2 is formed in a U-shaped cross section, and a pad retainer mounting portion 3e for mounting the pad retainer 13 is provided outside the pad guide groove 3d in the disk radial direction. Yes.

  Each friction pad 6 has a lining 6b attached to one side surface of the back plate 6a, and ear pieces 6c and 6c projecting on both sides of the back plate 6a. The pad guide groove 3d on the side and the outlet side is supported via the pad retainer 13. The back plate 6a is formed in a substantially sector shape in which the width in the disk circumferential direction on the outer side in the disk radial direction is longer than the width in the disk circumferential direction on the inner side in the disk brake radial direction. On the outer side in the disk radial direction, an engagement hole 6d of the pad return spring 7 opening outward in the disk radial direction is formed. A shim plate 14 is attached to the other side surface of the back plate 6a.

  The shim plate 14 is formed of a thin metal plate such as stainless steel, and has a main body portion 14a substantially along the outer shape of the other side surface of the back plate 6a, and a disk entry side of the disk radial outer end surface 6e of the back plate 6a. Three first cover portions 14b covering the center portion and the disk outlet side, and two second cover portions 14c covering the disk inlet side and the disk outlet side of the disk radial direction inner end face 6f of the back plate 6a, The shim plate 14 is locked to the back plate 6a by the first cover portion 14b and the second cover portion 14c. The first cover portion 14b on the disk insertion side is provided with a guide portion 14d when the friction pad engaging portion 7c of the pad return spring 7 is assembled to the engaging hole 6d, and the guide portion 14d is connected to the engaging hole 6d. And an opening 14e having a diameter larger than the outer diameter of the engagement hole 6d and a notch obliquely cut from the disk rotor side end 14f of the first cover 14b toward the opening 14e. A notch 14g is provided.

  The pad return spring 7 is formed by bending a wire spring. The pad return spring 7 is formed by folding the central portion of the wire spring into an arc shape, and is spaced apart from both ends of the turn-up portion 7a. Are formed in a substantially V shape including a pair of spring portions 7b, 7b extending along the friction pad engaging portion 7c protruding from the tip of each spring portion 7b toward the center of the disk rotor 2, The friction pad engaging portion 7c is formed to be bent at a substantially right angle with respect to the spring portion 7b. The pad return spring 7 is formed by attaching the friction pads 6 and 6 to the caliper bracket 3 and then turning the folded portion 7a toward the disk delivery side and the friction pad engaging portion 7c toward the disk delivery side, 7b is elastically deformed so as to be close to each other, and the friction pad engaging portions 7c, 7c are connected to the first cover portions 14b, 14b on the disk insertion side of the shim plates 14, 14 attached to the pair of friction pads 6, 6. The disk rotor side end portions 14f and 14f are brought into contact with each other. Next, as shown by imaginary lines in FIGS. 3 and 4, the friction pad engaging portions 7c and 7c are slid along the disc rotor side end portions 14f and 14f to the disk entry side, thereby causing the friction pad engaging portions to be moved. 7c and 7c are guided by the notches 14g and 14g to the engagement holes 6d and 6d, and are inserted and assembled into the engagement holes 6d and 6d, respectively, as shown by the solid and dotted lines in FIGS.

  In the vehicular disc brake 1 formed in this way, when the pressurized hydraulic fluid is supplied to the hydraulic chamber 11 by the driver's braking operation, the piston 8 moves forward through the cylinder hole 5d, and the action portion 5a side The friction pad 6 is pressed toward the disk rotor 2 side. The friction pad 6 on the action portion 5a side moves the pad guide grooves 3d and 3d to the disk rotor 2 side while the ear pieces 6c and 6c are guided by the pad retainers 13 and 13, and the lining 6b is moved to one side of the disk rotor 2. Make sliding contact with the side. Next, the caliper body 5 is moved in the direction of the action portion 5a while being guided by the slide pins 4 and 4 by this reaction force, and the reaction force claw 5f provided on the reaction portion 5b side is a friction pad 6 on the reaction portion 5b side. To the other side of the disk rotor 2. The friction pad 6 on the reaction portion 5b side moves the pad guide grooves 3d and 3d to the disk rotor 2 side while the ear pieces 6c and 6c are guided by the pad retainers 13 and 13, and the lining 6b is moved to the other side of the disk rotor 2. Make sliding contact with the side. At this time, the pad return spring 7 is elastically deformed by the folded portion 7a and the spring portions 7b and 7b as the friction pads 6 and 6 move toward the disk rotor 2, and the spring portions 7b and 7b approach each other. It becomes a state.

  On the other hand, when the above-described braking operation is released, the piston 8 rolls back with the restoring force of the piston seal 9, and the piston 8 and the reaction force claw 5f move back to the positions before the braking starts, the restoring force of the pad return spring 7 As a result, the spring portions 7b and 7b return to the initial state separated from each other with the folded portion 7a as the center, and accordingly, the friction pad engaging portions 7c and 7c are both connected via the engaging holes 6d and 6d. The friction pads 6 and 6 are moved to the side opposite to the disk rotor, and the linings 6 b and 6 b are separated from the side surface of the disk rotor 2.

  As described above, in the present embodiment, the friction pad engagement is achieved by simply sliding the friction pad engaging portion 7c of the pad return spring 7 along the notch portion 14g provided in the first cover portion 14b of the shim plate 14. The joining portion 7c can be easily and reliably engaged with the engaging hole 6d. Further, since the guide portion 14d is formed on the first cover portion 14b of the shim plate 14 that is easy to process, the processing man-hour of the back plate 6a is reduced as much as possible, and the cost of the pad return spring 7 is reduced. Assembling property can be improved.

  The present invention is not limited to the above-described embodiment, and an engagement hole is formed also on the disk delivery side of the friction pad, a guide portion is provided on the shim plate, and a pad return spring is also provided on the disk delivery side. The pad return spring may be disposed only on the disk delivery side. Moreover, the shape of the folding | returning part and spring part of a pad return spring is arbitrary, and the shape of a friction pad is also arbitrary.

DESCRIPTION OF SYMBOLS 1 ... Vehicle disc brake, 2 ... Disc rotor, 3 ... Caliper bracket, 3a ... Caliper support arm, 3b ... Tie rod, 3c ... Guide hole, 3d ... Pad guide groove, 4 ... Slide pin, 5 ... Caliper body, 5a ... Action part, 5b ... Reaction part, 5c ... Bridge part, 5d ... Cylinder hole, 5e ... Slide pin mounting arm, 5f ... Reaction force claw, 6 ... Friction pad, 6a ... Back plate, 6b ... Lining, 6c ... Ear piece, 6d ... engaging hole, 6e ... disk radial direction outer end surface, 6f ... disk radial direction inner end surface, 7 ... pad return spring, 7a ... folded portion, 7b ... spring portion, 7c ... friction pad engaging portion, 8 ... piston, DESCRIPTION OF SYMBOLS 9 ... Piston seal, 10 ... Dust seal, 11 ... Hydraulic pressure chamber, 12 ... Mounting bolt, 13 ... Pad retainer, 14 ... Shim plate, 14a ... Main-body part, 14b ... 1st cover , 14c ... second covering part, 14d ... guide portion, 14e ... opening, 14f ... disc rotor side end portion, 14 g ... notch

Claims (2)

Shim plates are respectively attached to the back plates of a pair of friction pads arranged on both sides of the disk rotor, and the pair of friction pads are pulled back to the opposite disk rotor side when braking is released outside the friction pad in the disk radial direction. In vehicle disc brakes with suspended pad return springs,
An engagement hole for engaging a friction pad engaging portion provided at a tip of the pad return spring is formed in the back plate, and the friction pad engaging portion is formed in the shim plate. A vehicle disc brake, characterized in that a guide portion for guiding is formed.   The engagement hole is formed in an outer end surface of the back plate in the radial direction of the disk, and the guide portion is formed in a cover portion covering the outer end surface of the back plate in the radial direction of the disk, and the engagement hole of the cover portion is formed in the engagement hole. The opening part formed in a corresponding position, and the notch part which notched diagonally toward the said opening part from the disk rotor side edge part of the said cover part is provided. Disc brake for vehicles.

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