JP2012215181A - Disc brake for vehicle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a disc brake for a vehicle, capable of preventing contact between a pad retainer and a disc rotor, and capable of securing a strength of the pad retainer without increasing a plate thickness.SOLUTION: The pad retainer 10 is provided with retainer parts 10a respectively disposed in pad guide grooves 3d (pad guide parts) on both sides of the disc rotor 2. The retainer parts 10a include an inner piece 10c and an outer piece 10d opposed in and out of the disc radial direction with a lug piece 6b of a friction pad 6 sandwiched therebetween, a back side piece 10e connecting the inner piece 10c and the outer piece 10d and disposed on an opposed surface 3g of the pad guide groove 3d, and an abutment part 10k in abutment with a disc rotor side surface 3j of a caliper support arm 3a. The abutment part 10k and the back side piece 10e are protruded to the friction pad side in parallel with the disc rotor 2 from the abutment part 10k, and are connected via a curved part 10j which is curved back in a circular arc shape to the opposed surface side.

Description

  The present invention relates to a vehicle disc brake used in vehicles such as automobiles and motorcycles, and more particularly to a structure of a pad retainer that supports an ear piece of a back plate of a friction pad by a pad guide portion of a caliper support arm.

  Conventionally, the ear pieces projecting on both sides of the friction pad backing plate are supported by a pad guide portion formed opposite to a pair of caliper support arms so as to be movable in the disc axis direction of the friction pad. In general, a disc brake includes a pad retainer formed of a thin metal plate between a pad guide portion and an ear piece. As this pad retainer, there is a retainer portion disposed in the pad guide portion, and a contact portion that abuts the side surface of the disk rotor of the caliper support arm is provided so that the pad retainer is reliably supported by the pad guide portion. (For example, refer to Patent Document 1 or 2.)

Japanese Utility Model Publication No. 56-129624 JP-A-7-332411

  However, in the above-mentioned Patent Document 1, the contact portion protrudes in the direction of the disc rotor side of the caliper support arm via a curved portion that is curved in an arc shape from the retainer portion to the disc rotor side, and the tip side is the caliper support arm. Therefore, when the disk rotor is subject to thermal collapse due to frictional heat during braking, the curved portion may come into contact with the disk rotor and be damaged. Moreover, in the thing of patent document 2, since the contact part is formed so that it may be bent substantially perpendicularly to the disk rotor side surface direction of the caliper support arm from the retainer part and contact the disk rotor side surface of the caliper support arm. The strength of the portion bent at a right angle is lowered and may be damaged, and the thickness of the pad retainer has to be increased.

  Therefore, an object of the present invention is to provide a vehicle disc brake that can prevent the pad retainer from coming into contact with the disc rotor and can secure the strength of the pad retainer without increasing the plate thickness.

  In order to achieve the above object, a vehicle disc brake according to the present invention includes a caliper bracket fixed to a vehicle body, and a pair of caliper support arms that support the caliper body extending from the outer edge of the disc rotor to the disc axial direction. The caliper support arm is provided with a pad guide portion opposed to each other, and ear pieces respectively protruding from both sides of the back side of the friction pad disposed with the disc rotor interposed therebetween are connected to the pad guide portion via a pad retainer. In the supported vehicle disc brake, the pad guide portion includes a pair of pad guide portions that face each other and a disc radial inner side surface that protrudes in an orthogonal direction from the disc radial direction inner side of the facing surface. The pad retainer includes retainer portions respectively disposed on pad guide portions on both sides of the disk rotor. A rear piece disposed on the opposing surface, an inner piece projecting in an orthogonal direction from the inner side of the disk radial direction of the rear side piece, and an abutting portion that comes into contact with the side surface of the disk rotor of the caliper support arm. The corresponding contact portion and the back piece are connected to each other through a curved portion that protrudes from the contact portion toward the friction pad in parallel with the disk rotor and is bent back into an arc shape on the opposite surface side. It is characterized by.

  Further, the ear piece is formed in a stepped shape in which a protruding length on the outer side in the disk radial direction of the disk rotation direction outer surface is shorter than a protruding length on the inner side in the disk radial direction, the curved portion and the contact portion Is preferably arranged at a position corresponding to the outer side of the ear piece in the radial direction of the disk, and the rear piece is located on the side opposite to the disk rotor at a position corresponding to the outer side of the ear piece in the radial direction of the disk. Further, a pad return piece for urging the friction pad in the anti-disk rotor direction may be provided. The pad guide portion protrudes in the orthogonal direction from the outer side of the opposing surface of the disk in the radial direction of the disk, and is formed in a U-shaped cross section having an outer side of the radial direction of the disk facing the inner side of the radial direction of the disk. The pad retainer may include an outer piece disposed on the outer surface in the disk radial direction so as to face the inner piece. Furthermore, it is preferable that the braking torque from the friction pad is received at the pad guide portion closer to the disc rotor center than the pressing center of the friction pad that presses the friction pad during braking.

  According to the vehicle disc brake of the present invention, the abutting portion provided on the pad retainer abuts the disc rotor side surface of the caliper support arm via the curving portion, and the curving portion extends from the abutting portion to the disc rotor. Since it protrudes in parallel to the friction pad side and is bent back into an arc shape on the opposing surface side of the pad guide part and connected to the back side piece, the disk rotor may cause thermal collapse due to frictional heat during braking However, there is no possibility of contact between the disk rotor and the curved portion. Thereby, it is possible to prevent the curved portion and the disk rotor from being damaged. Further, since the abutting portion abuts on the side surface of the disc rotor of the caliper support arm via the curved portion, the strength of the bent portion can be ensured without increasing the plate thickness.

  Further, the ear piece of the friction pad is formed in a stepped shape in which the protruding length on the outer side in the disk radial direction of the disk in the disk rotating direction is shorter than the protruding length on the inner side in the disk radial direction. Is disposed at a position corresponding to the outer side of the ear piece in the radial direction of the disk, even if the friction pad may move to the position of the curved part, The curved portion of the retainer support piece affects the slidability of the ear piece because the curved portion is not in contact with the ear piece. There is no.

  Furthermore, by using the space portion to form a pad return piece on the back side piece of the pad retainer, the pad return piece is not subjected to braking torque, and the friction pad when releasing the brake is satisfactorily brought to the initial position. Can be returned.

  The pad guide portion protrudes in the orthogonal direction from the disk radial direction outer side of the opposing surface, and is formed in a U-shaped cross section having a disk radial direction outer surface opposite to the disk radial direction inner surface. By providing the outer piece arranged on the outer surface in the disk radial direction so as to face the inner piece, the ear piece can be reliably held in the pad guide portion.

  Further, at the time of braking, the vibration of the friction pad is suppressed by receiving the braking torque from the friction pad at the pad guide portion closer to the center of the disc rotor than the pressing center of the friction pad that presses the friction pad. Can be suppressed.

1 is an enlarged sectional plan view of a vehicle disc brake showing an embodiment of the present invention. FIG. 3 is an enlarged cross-sectional front view of the vehicle disc brake. It is a perspective view of a pad retainer similarly. It is IV-IV sectional drawing of FIG. It is VV sectional drawing of FIG. 1 is a partial cross-sectional plan view of a vehicle disc brake. It is a front view of a disk brake for vehicles. It is explanatory drawing of the disk brake for vehicles at the time of braking.

  FIG. 1 to FIG. 8 are views showing one embodiment of the vehicle disc brake of the present invention. The vehicle disc brake 1 includes a disc rotor 2 that rotates integrally with a wheel and a vehicle body at one side of the disc rotor 2. A caliper bracket 3 fixed to the caliper, a caliper body 5 supported on the caliper support arms 3a and 3a of the caliper bracket 3 via a pair of slide pins 4 and 4 so as to be movable in the disk axial direction, and the caliper The body 5 includes a pair of friction pads 6 and 6 that are disposed opposite to each other with the disk rotor 2 interposed between the action portion 5a and the reaction portion 5b.

  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 7 having an opening on the disk rotor 2 side. The cylinder hole 7 accommodates a cylindrical piston 8 with a bottom, and the piston 8 moves in the direction of the disk rotor through the cylinder hole 7 by the hydraulic fluid supplied to the hydraulic chamber 9 at the bottom of the cylinder hole. ing. Further, vehicle body mounting arms 5d and 5d project from the side of the action portion 5a, and the above-described slide pins 4 project from the front ends of the vehicle body mounting arms 5d by mounting bolts. Yes.

  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 of the caliper support arms 3a and 3a extends along the side wall in the direction of the center of the disk, and the tip portions of the caliper support arms 3a and 3a are connected by tie rods 3b. ing.

  Each caliper support arm 3a is provided with a guide hole 3c for accommodating the slide pin 4 described above, and the four caliper support arms 3a and 3a have four pads facing each other on the respective side portions of the disc rotor 2. A guide groove 3d (pad guide portion of the present invention) is provided. Each pad guide groove 3d is formed in a U-shape having a disk radial direction outer side surface 3e, a disk radial direction inner side surface 3f, and an opposing surface 3g connecting both side surfaces 3e, 3f. Further, pad retainer mounting portions 3i and 3i having mounting surfaces 3h parallel to the disk radial direction outer side surface 3e are provided outside the pad guide grooves 3d and 3d in the disk radial direction.

  Each friction pad 6 has ear pieces 6b and 6b protruding from both sides of the back plate 6a, and a lining 6c is attached to one side of the back plate 6a. The ear pieces 6b, 6b are formed in a stepped shape in which both the disk rotation direction end faces 6d, 6d have a protruding length on the outer side in the disk radial direction shorter than a protruding length on the inner side in the disk radial direction. Are supported by the pad guide grooves 3d and 3d on the delivery side via the pad retainer 10, respectively.

  The pad retainer 10 includes a pair of retainer portions 10a, 10a laid in the pad guide grooves 3d, 3d on both sides of the disk rotor and the outer edge of the disk rotor 2 on the disk inlet side or the disk outlet side. The retainer portions 10a and 10a are connected to each other with a connecting piece 10b. Each retainer portion 10a has an inner piece 10c and an outer piece 10d facing the inner and outer sides in the radial direction of the disk across the ear piece 6b of the friction pad 6, and the inner side connecting these two pieces 10c and 10d at the inner portion of the pad guide groove 3d. It consists of a piece 10e.

  The rear piece 10e includes a retainer support piece 10f on the disk rotor side on the outer side in the disk radial direction, a pad return piece 10g on the opposite disk rotor side on the outer side in the disk radial direction, and a guide piece on the opposite disk rotor side in the middle of the disk radial direction. 10h each.

  The retainer support piece 10f is formed by an elongated piece extending from the disk rotor side end face 10i on the outer side in the disk radial direction of the back side piece 10e, and comes into contact with the curved portion 10j and the disk rotor side surface 3j of the caliper support arm 3a. The curved portion 10j protrudes from the contact portion 10k to the friction pad 6 side in parallel with the disc rotor 2, and is bent back into an arc shape on the facing surface 3g side and connected to the back piece 10e. .

  The pad return piece 10g is an elastic loop portion formed by bending an elongated piece extending toward the anti-disk rotor side from the end face on the anti-disk rotor side outside the disk radial direction of the back side piece 10e back to the disk rotor side in an arc shape. 10 m and a pad return portion 10 n extending to the disk rotor side through the elastic loop portion 10 m. The pad return portion 10n is configured to incline the tip end portion of the elongated piece extended in the disk rotor direction from the bent return end of the elastic loop portion 10m toward the far side, and along the extending direction. It is formed in a curved shape. The pad return portion 10n has a length sufficient for the distance that the ear piece 6b of the friction pad 6 moves from when the lining 6c is new to when it is fully worn.

  The outer piece 10d is bent back along the tip surface of the pad retainer mounting portion 3i so as to come into contact with the mounting surface 3h, and is extended toward the outer surface of the pad retainer mounting portion 3i in the radial direction of the disk. 10p is formed so as to be elastically deformable, and the pad retainer attachment portion 3i is sandwiched between the attachment piece 10p and the outer piece 10d that are elastically deformed outward in the radial direction of the disk. Further, insertion guide pieces 10q are provided on the outer side of each inner piece 10c on the side opposite to the disc rotor and the outer side piece 10d on the opposite side of the disc rotor so that the ear piece 6b of the friction pad 6 can be easily inserted. I am doing so. Further, the insertion guide piece 10q formed on the outer piece 10d is disposed on the side opposite to the disc rotor of the ear piece 6b in a state where the friction pad 6 is temporarily assembled to the caliper support arm 3a, and the ear piece 6b is disposed on the pad guide groove. A drop prevention protrusion 10r that prevents the drop from 3d protrudes inward in the disk radial direction.

  The inner piece 10c is formed such that the tip side is gradually inclined toward the outer side in the disk radial direction, and the anti-disk rotor side of the inner piece 10c is formed to be gradually inclined toward the disk axial direction. It has a structure that urges the outer side in the direction and the side opposite to the disk rotor.

  The pad retainer 10 formed in this way is attached to the caliper support arm 3a by holding the pad retainer attachment portion 3i between the attachment piece 10p and the outer piece 10d in a state where the attachment piece 10p is in contact with the attachment surface 3h. The inner piece 10c and the outer piece 10d of each retainer portion 10a are respectively disposed on the disk radial direction outer side surface 3e and the disk radial direction inner side surface 3f of the pad guide groove 3d, and the flange side piece 10h is formed on the opposing surface 3g. Be placed.

  With this attachment, the curved portion 10j of the retainer support piece 10f is disposed on the inner side of the pad guide groove than the disc rotor side end surface 10i of the back side piece 10h, and the contact portion 10k is the disc rotor side surface 3j of the caliper support arm 3a. The pad retainer 10 is securely supported by the pad guide groove 3d. Further, each pad return piece 10g has an elastic loop portion 10m disposed on the side opposite to the disk rotor of the caliper support arm 3a, and each pad return portion 10n is gradually padded toward the disc rotor from the elastic loop portion 10m. The guide grooves 3d are arranged to be inclined while being curved toward the opposite disk rotor side.

  Each friction pad 6 is inserted while the ear piece 6b of the back plate 6a is guided to the guide piece 10h and the insertion guide piece 10q from the opposite side of the disk rotor on the opposite side of the disk guide groove 3d, 3d. The push-out preventing protrusion 10r formed on the guide piece 10q is pushed up and inserted into the pad guide groove 3d. When the ear piece 6b is inserted to a predetermined position in the pad guide groove 3d, the drop-off preventing projection 10r returns to the initial position and is disposed on the side of the ear piece 6b opposite to the disk rotor.

  In the state after the ear pieces 6b are respectively inserted into the opposing pad guide grooves 3d as described above, there is a space between the disk radial direction outer surface 6f of the disk rotation direction end face 6d of the ear piece 6b and the back side piece 10e. A portion E1 is formed, and the curved portion 10j of the pad retainer 10 and the pad return piece 10g are disposed in the space portion E1. The disk radial direction outer side surface 10f of the disk rotation direction end surface 6d of the ear piece 6b is in contact with the pad return portion 10n and presses the pad return portion 10n toward the back side piece 10e. Further, the inner side in the disk radial direction of the end surface 6d in the disk rotation direction of the ear piece 6b contacts the inner side piece 10e, and the inner side surface 6e in the disk radial direction of the ear piece 6b becomes the inner side surface in the disk radial direction of the pad guide groove 3d. It will be in the state pressed to the 3f side.

  This embodiment is formed as described above, and when the pressurized hydraulic fluid is supplied to the hydraulic pressure chamber 9 by the driver's braking operation, the piston 8 moves forward through the cylinder hole 7 to act on the action portion 5a side. The friction pad 6 is pressed against one side of the disk rotor 2 rotating in the direction of arrow A. Next, the caliper body 5 is moved in the direction of the action portion 5 a while being guided by the slide pins 4 and 4 by this reaction force, and the reaction force claw 5 e causes the friction pad 6 on the reaction portion 5 b side to move to the other side surface of the disk rotor 2. Press to.

  At this time, each ear piece 6b of each friction pad 6 has a disk radial direction outer surface 6f guided to the outer piece 10d of the retainer portion 10a, and the disk radial inner side surface 6e of the ear piece 6b passes the inner piece 10c to the disk radius. It moves smoothly in the pad guide groove 3d while pressing toward the inner side surface 3f. The inner piece 10c is pressed by the ear piece 6b toward the inner side surface 3f in the disk radial direction, but the elastic force of the inner piece 10c causes the outer surface 6f of the ear piece 6b in the radial direction of the disk to move to the disk in the pad guide groove 3d. While pressing to the radial direction outer surface 3e side, the ear piece 6b is pressed to the non-disc rotor side.

  As a result, the outer surface 6f of the ear piece 6b in the radial direction of the disk is always pressed against the outer surface 3e of the pad guide groove 3d in the radial direction of the disc through the outer piece 10d of the pad retainer 10. There is no backlash in the groove 3d, and the striking sound of each friction pad 6 due to backlash can be suppressed, and brake noise can be effectively suppressed.

  On the other hand, when the above-described braking operation is released and the piston 8 and the reaction force claw 5e are retracted to the positions before the start of braking, the elastic force of the elastic loop portion 10m and the pad return portion 10n is applied to the pad return portion 10n. The contacting ear piece 6b is pressed to the side opposite to the disk rotor, and each friction pad 6 is forcibly separated from the side surface of the disk rotor 2. Thereby, dragging of each friction pad 6 can be prevented, and judder caused by wear of the disc rotor 2 and brake noise can be effectively suppressed.

  Further, even if the disc rotor 2 is subject to thermal collapse due to frictional heat during braking due to repeated braking, the curved portion 10j of the retainer support piece 10f is more than the disc rotor side end surface 10i of the back side piece 10h. Since it is disposed inside the pad guide groove, there is no possibility that the disk rotor 2 and the curved portion 10j come into contact with each other. Furthermore, since the retainer support piece 10f contacts the disk rotor side surface 3j of the caliper support arm 3a via the curved portion 10j, the strength of the bent portion can be ensured without increasing the plate thickness. Further, the retainer support piece 10f is disposed in the space E1 formed between the disk radial direction outer surface 6f of the disk rotation direction end surface 6d of the ear piece 6b and the back side piece 10e of the retainer support piece 10f. There is no possibility that the curved portion 10j affects the slidability of the ear piece 6b.

  Further, in the vehicle disc brake 1 according to the present embodiment, the protruding length on the outer side in the disc radial direction of the both ends 6b of the ear pieces 6b of the friction pad 6 is shorter than the protruding length on the inner side in the disc radial direction. Since the stepped shape is formed, the outer side surface 6f of the disk radial direction of each ear piece 6b abuts on the back side piece 10e of the pad retainer 10 disposed on the opposing surface 3g of the pad guide groove 3d during braking. Instead, only the inner surface 6g in the disk radial direction of each ear piece 6b contacts the back piece 10e to transmit the braking torque. As a result, braking torque is received on the disc rotor center side with respect to the center CL1 of the piston 8 (pressing center of the friction pad of the present invention), and particularly when performing a braking operation with a small load, as shown in FIG. As described above, the friction pad 6 behaves in a direction (arrow B direction) sinking to the inner circumference side of the disk on the disk delivery side, and in a direction (arrow C direction) floating on the outer circumference side of the disk on the disk delivery side. The inner side in the disk radial direction of the ear piece 6b on the entry side and the opposing surface 3g of the pad guide groove 3d are in strong contact with each other through the inner piece 10e. With such a state, the holding force of the ear piece 6b on the disk entry side is increased, the vibration of the friction pads 6 and 6 is suppressed, and the occurrence of brake squeal can be suppressed.

  The present invention is not limited to the above-described embodiment, and the pad retainer of the pad retainer, the connecting piece, the guide piece, the insertion guide piece, and the shape of the drop-off preventing projection are arbitrary, and these are omitted. Things can be used. In addition, it is also applicable to the type in which the ear pad of the friction pad is supported on the stepped pad guide part provided with the opposing surface and the inner surface in the disk radial direction, and the pad spring is arranged on the outer side in the disk radial direction of the ear piece. it can. Further, the end surface in the disk rotation direction of the ear piece of the friction pad may be formed flat. Further, the inner piece may not be gradually inclined outward in the disk radial direction toward the disk rotor side.

  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, 3e ... Disc radial direction outer surface, 3f ... Disc radius Direction inner surface, 3g ... opposing surface, 3h ... mounting surface, 3i ... pad retainer mounting portion, 3j ... disk side surface, 4 ... slide pin, 5 ... caliper body, 5a ... action portion, 5b ... reaction portion, 5c ... bridge portion 5d: Body mounting arm, 5e: Reaction force claw, 6 ... Friction pad, 6a ... Back plate, 6b ... Ear piece, 6c ... Lining, 6d ... End surface in the rotational direction, 6e ... Inner surface in the disk radial direction, 6f ... Disk radius Direction outer side surface, 6 g ... disk radial inner side surface, 7 ... cylinder hole, 8 ... piston, 9 ... hydraulic chamber, 10 ... pad retainer, 10a ... retainer part, 10b ... Binding piece, 10c ... inner piece, 10d ... outer piece, 10e ... rear side piece, 10f ... retainer support piece, 10g ... pad return piece, 10h ... guide piece, 10i ... disc rotor side end face, 10j ... curved portion, 10k ... Contact part, 10m ... elastic loop part, 10n ... pad return part, 10p ... mounting piece, 10q ... insertion guide piece, 10r ... drop-off prevention protrusion

Claims (5)

A caliper bracket fixed to the vehicle body spans the outer edge of the disc rotor in the disc axial direction, extends a pair of caliper support arms that support the caliper body, and provides a pad guide portion facing the caliper support arms, In the vehicular disc brake in which the ear pieces projecting from both sides of the back side of the friction pad disposed across the disc rotor are supported by the pad guide portion via a pad retainer, the pad guide portion includes a pair of The pad guide portion has opposing surfaces facing each other, and a disk radial inner side surface projecting in an orthogonal direction from the disk radial direction inner side of the opposing surface, and the pad retainer is formed on the pad guide portions on both sides of the disk rotor. Retainer portions respectively disposed, and the retainer portion includes a back piece disposed on the facing surface and a disk on the back piece. An inner piece projecting in an orthogonal direction from the radially inner side, and an abutting portion that abuts a side surface of the disc rotor of the caliper support arm, and the corresponding abutting portion and the inner side piece are connected to the disc rotor from the abutting portion. A vehicular disc brake characterized in that it protrudes in parallel to the friction pad side and is connected to the facing surface side via a curved portion bent back in an arc shape. The ear piece is formed in a stepped shape in which the protruding length on the outer side in the disk radial direction of the disk rotation direction is shorter than the protruding length on the inner side in the disk radial direction, and the curved portion and the contact portion are: The vehicle disc brake according to claim 1, wherein the disc brake is disposed at a position corresponding to the outer side of the ear piece in the radial direction of the disc. The back side piece has a pad return piece for urging the friction pad in the anti-disk rotor direction on the anti-disk rotor side at a position corresponding to the outside in the disk radial direction of the ear piece. The vehicle disc brake according to claim 2. The pad guide portion protrudes in an orthogonal direction from the outer side in the disk radial direction of the facing surface, and is formed in a U-shaped cross section having a disk radial direction outer surface facing the inner surface in the disk radial direction. The vehicle disc brake according to any one of claims 1 to 3, wherein the retainer includes an outer piece disposed on the outer surface in the disk radial direction so as to face the inner piece. 5. The braking torque from the friction pad is received at the pad guide portion closer to the center of the disc rotor than the pressing center of the friction pad that presses the friction pad during braking. The disc brake for vehicles according to the item.

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