JP5608149B2 - Vehicle disc brake - Google Patents

Description

  The present invention relates to a vehicle disc brake mounted on a traveling vehicle such as an automobile or a motorcycle or three-wheeled vehicle. More specifically, the present invention relates to a vehicle disc brake having a pad return spring that separates a friction pad from a side surface of a disc rotor when braking is released. About.

  2. Description of the Related Art Conventionally, in a vehicle disc brake, a pad return spring for attaching the pair of friction pads away from the side surface of the disc rotor when releasing the brake is attached to the outer side in the disc radial direction of the pair of friction pads arranged on both sides of the disc rotor. There is something. As the pad return spring, one wire spring is bent, and a diamond-shaped portion suspended on the disk radial direction outside of the pair of friction pads, and a latch formed at both ends of the diamond-shaped portion and locked to the bracket And a pair of loops formed at the center of the rhombus and engaged with the friction pad, and the loops are engaged with the engaging grooves of the protrusions provided on the disk radial outer surface of the friction pad. There was a thing made to do (for example, refer patent document 1).

Japanese Utility Model Publication No. 60-23560

  However, the above-described pad return spring engages the caliper bracket with the end portion on the disk entrance side and the end portion on the disc exit side, and the loop portion in the engagement groove provided on the tip surface of the protrusion of the friction pad. Since it is to be engaged, it took time to assemble. In addition, since it is necessary to provide a protrusion on the back plate of the friction pad and to form an engagement groove on the tip surface of the protrusion, the manufacturing cost of the friction pad is increased.

  SUMMARY OF THE INVENTION An object of the present invention is to provide a vehicle disc brake including a pad return spring that can improve assembly and reduce manufacturing costs.

  In order to achieve the above object, a disc brake for a vehicle according to the present invention includes a caliper body having a bridge portion straddling the outer peripheral side of the disc rotor, a pair of friction pads disposed on both sides of the disc rotor, and the friction pad. And a pad return spring that is spaced from the side surface of the disk rotor when the brake is released. The pad return spring is a back plate of each friction pad. A pair of pad abutting portions that respectively abut on the side surfaces of the disk rotor, rising pieces that respectively rise from the both end portions of the pad abutting portion along the both end surfaces in the disk rotation direction of the bridge portion toward the outer periphery of the disc, and the disc The rising ends of the rising pieces facing each other on both sides of the rotor are connected to each other, and the Tsu by bending the di portion and a pair of locking portions for locking the outer surface of the bridge portion, is characterized by elastic deformation in accordance with movement of the friction pad during braking.

  The pad return spring is preferably formed by bending one wire spring, and the pad contact portion is formed on one side surface of the wire spring extending in the disk circumferential direction of the back plate. Can be formed. Furthermore, the disk radial direction outer surface of the lining of the friction pad is formed in an arc shape corresponding to the curvature of the outer periphery of the disk rotor, and the pad contact portion is an arc shape along the disk radial direction outer surface of the lining. It is preferable to be formed. Further, the friction pad is hung on a disk axial hanger pin installed on the caliper body, and on the outer side in the disk radial direction of the back plate, a hanging piece for inserting the hanger pin is protruded. A part of the pad abutting portion can be brought into contact with the hanging piece. Further, it is preferable that the rising pieces opposed to each other with the disk rotor interposed therebetween are formed so as to gradually approach each other from the end on the pad contact portion side toward the locking portion.

  According to the vehicle disc brake of the present invention, the pad return spring is assembled simply by engaging the engaging portion with the outer surface of the bridge portion and bringing the pad contact portion into contact with the disc rotor side surface of the back plate of the friction pad. Therefore, the assembling property can be improved. In addition, the pad return spring is elastically deformed during braking, and when the brake is released, the pad abutting portion urges the friction pad toward the disk rotor side by the restoring force. It can be reliably separated. Furthermore, since a special structure for locking the pad return spring to the friction pad is not required, the manufacturing cost can be reduced.

  Further, the pad return spring can be easily manufactured by bending one wire spring, and the pad contact portion extends in the disk circumferential direction of the back plate. By forming the spring on one side surface and pressing the friction pad on the entire side surface, the friction pad can be pressed uniformly when the brake is released, and can be reliably separated from the side surface of the disk rotor. Further, the disk radial outer surface of the friction pad lining is formed in an arc shape corresponding to the curvature of the outer periphery of the disk rotor, and the pad contact portion is formed in an arc shape along the disk radial outer surface of the lining. By doing so, the pad contact portion can press a wide range of the back plate without interfering with the lining. Also, the friction pad is hung on the hanger pin in the disk axial direction installed on the caliper body, and a part of the pad abutting portion is brought into contact with the hanger pin hanging piece provided on the outer side in the disk radial direction of the back plate. Therefore, in a pin slide type disc brake, a pad return spring can be provided with a simple structure, and the portion close to the hanger pin of the friction pad can be pressed by the pad abutting portion. The pad can be reliably separated from the side surface of the disk rotor. Further, the rising pieces facing each other on both sides of the disk rotor are formed so as to gradually approach each other from the end on the pad contact portion side toward the locking portion, whereby the locking portion of the pad return spring is formed. It can be easily assembled outside the bridge part of the caliper body.

It is II sectional drawing of FIG. It is II-II sectional drawing of FIG. It is a perspective view of the pad return spring which shows one example of the present invention. It is a side view of a disk brake for vehicles similarly. It is a front view of the disk brake for vehicles similarly. FIG. 3 is a rear view of the vehicle disc brake. It is a top view of the disk brake for vehicles similarly. It is VIII-VIII sectional drawing of FIG.

  FIGS. 1 to 7 show a first embodiment of the present invention. An arrow A indicates the rotation direction of a disk rotor that rotates integrally with the front wheels when the vehicle moves forward. The entry side is when the vehicle is moving forward.

  The vehicle disc brake 1 includes a disc rotor 2, a caliper bracket 3 fixed to the vehicle body on one side of the disc rotor 2, and a pair of slide pins 4 on caliper support arms 3a and 3a of the caliper bracket 3. , 5 and a pair of frictions arranged opposite to each other with the disc rotor 2 interposed between the caliper body 6 supported so as to be movable in the disc axial direction and the action portion 6a and the reaction portion 6b of the caliper body 6. A pad return spring 9 is attached to the friction pads 7 and 8 to separate the friction pads 7 and 8 from the side surface of the disc rotor 2 when the brake is released.

  The caliper body 6 includes the above-described action portion 6a and reaction portion 6b disposed on both sides of the disk rotor 2, and a bridge portion 6c that connects these across the outside of the disk rotor 2, and the action portion 6a. Is provided with a cylinder hole 6d having an opening on the disk rotor 2 side. A cylinder 10 with a bottom is accommodated in the cylinder hole 6d, and the piston 10 moves in the direction of the disk rotor through the cylinder hole 6d by the hydraulic pressure supplied to the hydraulic chamber 11 at the bottom of the cylinder hole. Yes. Further, mounting arms 6e and 6f project from the disk brake turning-in side and the drawing-out side of the action portion 6a, and the caliper body 6 is formed by the slide pins 4 and 5 inserted through the mounting arms 6e and 6f. Is supported by the caliper bracket 3 so as to be movable in the disk axial direction. On the disk delivery side of the bridge portion 6c, a cylindrical torque receiving pin 12 in which the flange portion of the proximal end is in contact with the reaction portion side surface of the caliper bracket 3 straddles the outer periphery of the disk rotor 2 in the disk axial direction. Protruding in the direction of the reaction portion, the torque receiving pin 12 is used for mounting the slide pin 5 on the disk delivery side.

  An annular piston seal mounting groove 6g is provided in the axially intermediate portion on the inner peripheral surface of the cylinder hole 6d, and an annular dust seal mounting groove 6h is provided closer to the cylinder hole opening side than the piston seal mounting groove 6g. Is installed around. The piston seal mounting groove 6g is fitted with a piston seal 13 that slides in liquid-tight and movable manner on the outer peripheral surface of the piston 10 and rolls back the piston 10 with its restoring force. The dust seal mounting groove 6h A dust seal 14 is fitted on the outer peripheral surface of the piston 10 so as to be movable so as to prevent dust from entering the cylinder hole.

  The friction pads 7 and 8 are configured by fixing linings 7a and 8a slidably contacting the side surfaces of the disk rotor 2 to metal back plates 7b and 8b, and between the action part 6a and the reaction part 6b of the caliper body 6. Are hung on a pair of hanger pins 15, 15 respectively. The friction pad 7 on the working side is disposed between the torque receiving portions 3b, 3b formed on the caliper bracket 3, and a torque transmission surface 7c is formed on the disk delivery side of the back plate 7b. Further, a hanging piece 7d is projected from the center of the back plate 7b on the outer peripheral side of the disk, and hanger pin insertion grooves 7e and 7e for inserting the hanger pins 15 and 15 are formed on both sides of the hanging piece 7d. ing. The friction pad 8 on the reaction portion side is provided with a bifurcated torque transmission arm 8c on the disk delivery side of the back plate 8b, and the torque transmission arm 8c guides the torque receiving pin 12 to be held. A groove 8d is formed. Further, a hanging piece 8e is projected from the center of the back plate 8b on the outer peripheral side of the disk, and hanger pin insertion grooves 8f and 8f for inserting the hanger pins 15 and 15 are formed on both sides of the hanging piece 8e. ing. The linings 7 a and 8 a of the friction pads 7 and 8 are formed in the same shape, and the disk radial direction outer surfaces 7 f and 8 g are formed in an arc shape corresponding to the curvature of the outer periphery of the disk rotor 2.

  The pad return spring 9 is formed by bending one wire spring, and a pair of pad abutting portions 9a that abut against the disk rotor side surfaces 7g and 8h of the back plates of the friction pads 7 and 8, respectively. 9a and four rising pieces 9b rising from both end portions of each pad abutting portion 9a to the outer surface 6k side of the bridge portion 6c along both end surfaces 6i and 6i in the disk rotation direction of the bridge portion 6c of the caliper body 6 And a pair of loop-like engagements that connect the leading end portions of the rising pieces 9b facing each other on both sides of the disk rotor 2 and bend toward the bridge portion 6c to be engaged with the outer surface 6k of the bridge portion 6c. Stop portions 9c and 9c are provided. The pad abutting portion 9a is formed on one side surface of the wire spring, is formed in an arc shape along the disc radial direction outer surfaces 7f and 8g of the linings 7a and 8a, and a part of the pad abutting portion 9a is a back plate 7b. , 8b is formed so as to pass through the base ends of the hanging pieces 7d, 8e. Further, a proximal end 9d and a distal end 9e of the wire spring are disposed at the central portion of the contact portion 9a on the action portion side, and a gap is formed between the proximal end 9d and the distal end 9e. Further, the rising pieces 9b, 9b facing each other on both sides of the disk rotor 2 are formed so as to gradually approach each other from the end on the pad contact portion side toward the locking portion 9c.

  In the disc brake 1 according to the present embodiment, when hydraulic fluid is supplied during braking, the piston 10 moves forward in the cylinder hole, pushes the friction pad 7 on the action side, and the lining 7a of the friction pad 7 is moved. Press against one side of the disk rotor 2. Next, the caliper body 6 is moved in the direction of the action portion 6a while being guided by the slide pins 4 and 5 due to this reaction, and the reaction force claws 6m and 6m of the reaction portion 6b push the friction pad 8 on the reaction portion side to cause friction. The disk rotor 2 is braked by pressing the lining 8 a of the pad 8 against the other side of the disk rotor 2. At this time, the pad return spring 9 is elastically deformed as the friction pads 7 and 8 move, and the pad contact portions 9a and 9a approach, and the rising pieces 9b and 9b that face each other via the locking portion 9c approach. It becomes a state.

  When the braking operation is released, the caliper body 6 slides to the reaction portion side and returns to the original position. At this time, the pad return spring 9 is restored to the initial state by the restoring force of the locking portion 9c and the rising piece 9b by the pad abutting portions 9a, 9a that have been approached during braking, and the friction pad 7 , 8 are separated from the side surface of the disk rotor 2.

  The pad return spring 9 according to the present embodiment is formed as described above, so that the locking portion 9c is locked to the outer surface 6k of the bridge portion 6c, and the pad contact portions 9a and 9a are locked to the friction pads 7 and 8. It can be easily assembled to the caliper body 6 simply by abutting against the disk rotor side surfaces 7g and 8h of the back plates 7b and 8b. Further, when the brake is released, the elastically deformed pad return spring 9 is restored to the initial state when the brake is released, so that the pad contact portion 9a presses the friction pads 7 and 8 toward the opposite disk rotor side. 7 and 8 can be reliably separated from the side surface of the disk rotor. Further, since a special structure for locking the pad return spring 9 to the friction pads 7 and 8 is not required, the manufacturing cost can be reduced.

  Further, by forming the pad return spring 9 by bending a single wire spring, the pad return spring 9 can be manufactured by simple processing, and the pad abutting portion 9a is connected to the back plate 7b, 8b is formed by one side surface of a wire spring extending in the circumferential direction of the disk, and the friction pads 7, 8 can be uniformly pressed by pressing the friction pads 7, 8 over the entire one side surface. The friction pads 7 and 8 can be reliably separated from the side surface of the disk rotor. Further, the disk radial direction outer surfaces 7f and 8g of the linings 7a and 8a of the friction pads 7 and 8 are formed in an arc shape corresponding to the curvature of the outer periphery of the disk rotor 2, and the pad contact portion 9a is formed of the lining 7a and 8a. By forming an arc shape along the outer surface 7f, 8g in the radial direction of the disk 8a, the pad contact portions 9a, 9a press a wide range of the back plates 7b, 8b without interfering with the linings 7a, 8a. be able to.

  Further, by making a part of the pad contact portions 9a, 9a contact the hanging pieces 7d, 8e of the hanger pins 15 provided on the outer side in the disk radial direction of the back plates 7b, 8b, Since the portion close to the hanger pins 15 and 15 of the friction pads 7 and 8 can be pressed by 9a, the friction pads 7 and 8 can be reliably separated from the side surface of the disk rotor when the brake is released. Further, the rising pieces 9b, 9b facing each other with the disc rotor 2 interposed therebetween are formed so as to gradually approach each other from the end on the pad contact portion side toward the locking portion 9c, so that the pad return spring 9 The locking portion 9c can be easily assembled to the outside of the bridge portion 6c of the caliper body 6 by utilizing the spring property of the rising pieces 9b, 9b.

  The present invention is not limited to the above-described embodiment, and the rising pieces of the pad return springs facing each other across the disk rotor are gradually brought closer to each other from the end on the pad contact portion side toward the locking portion. It is not necessary to form them, and they may stand up in parallel with each other. Moreover, the shape of the lining is not limited to a circular arc along the outer surface in the radial direction of the disk, and the shape thereof is arbitrary, and may be formed in a straight line, or formed by projecting to the hanging piece side of the hanger pin. You can also. Furthermore, the present invention is not limited to the one applied to the disc brake having the pin slide type caliper body as in the above-described embodiment, and can be applied to any type of disc brake. It can also be applied to disc brakes.

  DESCRIPTION OF SYMBOLS 1 ... Vehicle disc brake, 2 ... Disc rotor, 3 ... Caliper bracket, 3a ... Caliper support arm, 3b ... Torque receiving part, 4 ... Slide pin, 5 ... Slide pin, 6 ... Caliper body, 6a ... Action part, 6b ... Reaction part, 6c ... Bridge part, 6d ... Cylinder hole, 6e, 6f ... Mounting arm, 6g ... Piston seal mounting groove, 6h ... Dust seal mounting groove, 6i ... Disk rotation direction side end surface, 6k ... Outer surface, 6m ... Reaction force Claw, 7 ... Friction pad, 7a ... Lining, 7b ... Back plate, 7c ... Torque transmission surface, 7d ... Hanging piece, 7e ... Hanger pin insertion groove, 7f ... Disc radial outer side surface, 7g ... Disc rotor side surface, 8 ... friction pad, 8a ... lining, 8b ... back plate, 8c ... torque transmission arm, 8d ... guide groove, 8e ... hanging piece, 8f ... hanger pin insertion groove, 8g ... disc Radial outer side surface, 8h ... disk rotor side surface, 9 ... pad return spring, 9a ... pad contact portion, 9b ... rising piece, 9c ... locking portion, 9d ... base end, 9e ... tip end, 10 ... piston, 11 ... Hydraulic chamber, 12 ... Torque receiving pin, 13 ... Piston seal, 14 ... Dust seal, 15 ... Hanger pin

Claims (6)

A caliper body having a bridge portion straddling the outer peripheral side of the disc rotor, a pair of friction pads disposed on both sides of the disc rotor, and the pair of friction pads attached to the disc radial outer side of the friction pad when releasing the brake. In a vehicle disc brake including a pad return spring that separates the pad from the side surface of the disk rotor, the pad return spring includes a pair of pad contact portions that respectively contact the disk rotor side surface of the back plate of each friction pad; A rising piece that rises from the both ends of the pad contact portion along the both ends of the bridge in the disk rotation direction to the outer peripheral side of the disk, and the rising ends of the rising pieces that face each other on both sides of the disk rotor. A pair of engagements that are coupled and bent to the bridge portion side and locked to the outer surface of the bridge portion. And a section, a vehicle disc brake, wherein the elastic deformation in accordance with movement of the friction pad during braking. 2. The vehicle disc brake according to claim 1, wherein the pad return spring is formed by bending one wire spring. 3. The vehicle disc brake according to claim 2, wherein the pad contact portion is formed on one side surface of the wire spring extending in the disc circumferential direction of the back plate. The outer surface in the disk radial direction of the lining of the friction pad is formed in an arc shape corresponding to the curvature of the outer periphery of the disk rotor, and the pad contact portion is formed in an arc shape along the outer surface in the disk radial direction of the lining. The vehicle disc brake according to any one of claims 1 to 3, wherein the vehicle disc brake is provided. The friction pad is hung on a hanger pin in the disk axial direction installed on the caliper body, and a hanging piece for inserting the hanger pin is provided on the outer side in the disk radial direction of the back plate. The vehicle disc brake according to any one of claims 1 to 4, wherein a part of the abutting portion abuts on the suspension piece. 6. The rising pieces facing each other at both side portions of the disk rotor are formed so as to gradually approach each other from an end portion on the pad contact portion side toward the locking portion. The disk brake for vehicles of any one of Claims.

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