JP2010236615A - Disc brake for vehicle - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To improve ease of installation of a friction pad and prevent falling of the friction pad from a pad guide groove. <P>SOLUTION: Retainer parts 10a of a pad retainer 10 each include an inner piece 10g, an outer piece 10h and a back side piece 10i connecting them. The outer piece 10h is formed with a falling prevention piece 10d by bending a strip extending from a counter-disc rotor side of the outer piece 10h outward in a disc radial direction and by bending an end portion toward a disc rotor direction in a circular-arc. The falling prevention piece is elastically deformable in a direction of allowing insertion of a lug 6b of the friction pad 6 into the pad guide groove 3d and contacts at an end 10n with a counter-disc rotor side surface 6d of the lug 6b while the lug 6b is inserted in the pad guide groove 3d. <P>COPYRIGHT: (C)2011,JPO&INPIT

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 a back plate ear piece of a friction pad by a pad guide groove of a caliper support arm.

  Conventionally, the ear pieces projecting on both sides of the back plate of the friction pad are supported by a pad guide groove formed opposite to a pair of caliper support arms to support the friction pad so as to be movable in the disk axis direction. In general, in a disc brake, a pad retainer formed of a thin metal plate is interposed between a pad guide groove and an ear piece. The pad retainer has an inner piece that contacts the inner surface of the pad guide groove in the radial direction of the disk, and is formed continuously with the inner piece to urge the ear piece of the friction pad outward in the radial direction of the disk. There is a pad return part that urges the ear piece in the direction opposite to the disk rotor, and this pad return part has a base of the elongated piece that extends to the side opposite to the disk rotor from the outer side in the disk radial direction. The elastic loop portion is formed by bending in an arc shape toward the disc rotor, and the tip of the elongated piece extending from the elastic loop portion toward the disc rotor is inclined toward the outer side in the disc radial direction. It was. When the friction pad is temporarily assembled to the caliper support arm, the elastic loop portion abuts against the anti-disc rotor side of the ear piece even if the ear piece is pressed in the drop-out direction on the anti-disc rotor side by the pad return portion. This prevents the friction pad from falling off the caliper bracket (see, for example, Patent Document 1).

Japanese Patent No. 3934063

  However, in the above, the elastic loop part is provided on the side opposite to the disk rotor of the pad guide groove and on the outer side in the disk radial direction. Therefore, when assembling the friction pad, the ear piece is assembled avoiding the elastic loop part. It was necessary and assembly was not good.

  SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a vehicle disc brake capable of improving the assemblability of a friction pad and reliably preventing the friction pad from falling off a pad guide groove.

  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 extending across the outer edge of the disc rotor in the disc axial direction. A U-shaped pad guide groove having an outer surface in the radial direction of the disk, an inner surface in the radial direction of the disk, and an opposing surface connecting the both side surfaces is provided to face the back of the friction pad disposed with the disk rotor interposed therebetween. Ear pieces projecting from both sides of the plate, and the ear pieces are supported by the pad guide grooves via pad retainers, the pad retainers being laid in pad guide grooves on both sides of the disk rotor. And a connecting piece that connects the pair of retainer parts across the outer edge of the disk rotor, and a pad return part that biases the friction pad in the direction opposite to the disk rotor The retainer portion includes an inner piece that contacts the inner surface in the disk radial direction, an outer piece laid on the outer surface in the disk radial direction, and the outer piece and the inner piece. And the outer piece is formed by bending an elongated piece extending from the opposite side of the outer piece to the outer side in the disk radial direction and a tip end portion of the outer piece. Bending in a circular arc shape toward the disk rotor, elastically deformable in a direction allowing insertion of the ear piece into the pad guide groove, and the ear piece being inserted into the pad guide groove Further, a drop-off preventing piece whose tip is in contact with the side of the ear piece opposite to the disk rotor is formed.

  Further, the inner piece can be formed by gradually inclining the tip side toward the outer side in the disk radial direction, and the pad return portion is an elongated shape extending from the counter disk rotor side of the back piece. The piece is bent back to the disk rotor side to form an elastic part, and the tip side of the elongated piece is further extended toward the disk rotor, the tip part is inclined toward the far side, and along the extending direction. It can also be formed in a curved shape.

  According to the disk brake for a vehicle of the present invention, when assembling the friction pad, the ear piece can be easily inserted into the pad guide groove while elastically deforming the drop-off prevention piece from the side opposite to the disk rotor of the pad guide groove. . Furthermore, when the ear piece is inserted into the pad guide groove, the drop-off prevention piece returns to its initial state, and the tip of the drop-off prevention piece comes into contact with the side of the ear piece opposite to the disk rotor. Can be prevented, and assemblability can be improved. In addition, the fall-off prevention piece only bends the elongated piece extending from the outer side of the pad retainer on the side opposite to the disc rotor to the outer side in the radial direction of the disc, and the tip is bent in an arc shape toward the disc rotor. Because of this simple structure, there is no risk of increased costs.

  Furthermore, the friction pad can be biased outward in the radial direction of the disk by inclining the tip side of the inner piece of the pad retainer toward the outer side in the radial direction of the disk, and the friction pad may rattle during braking by the pad retainer. Can be suppressed.

It is II sectional drawing of FIG. It is a principal part expanded sectional view of the disc brake for vehicles which shows one example of this invention. It is a perspective view of a pad retainer similarly. It is a partial cross section top view of the disk brake for vehicles similarly. It is VV sectional drawing of FIG. It is explanatory drawing which shows the assembly | attachment state of a friction pad.

  FIGS. 1 to 6 are views showing one embodiment of the disk brake for a vehicle according to the present invention. An arrow A indicates a rotation direction of a disk rotor that rotates integrally with a front wheel when the vehicle moves forward. The disk entry side is when the vehicle is moving forward.

  The disc brake 1 for a vehicle includes a disc rotor 2 that rotates integrally with a wheel, a caliper bracket 3 that is fixed to a vehicle body at one side of the disc rotor 2, and caliper support arms 3 a and 3 a of the caliper bracket 3. The caliper body 5 supported so as to be movable in the disk axial direction via a pair of slide pins 4 and 4 and the action portion 5a and the reaction portion 5b of the caliper body 5 are opposed to each other with the disc rotor 2 interposed therebetween. It consists of a pair of friction pads 6 and 6 arranged.

  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 disk rotor 2 from both sides of the caliper bracket 3 while sandwiching both sides of the bridge portion 5c in the disk axial direction, and further on the other side of the disk rotor 2 at 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 support arms 3a and 3a to which braking torque is applied.

  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 is provided. Each pad guide groove 3d is formed in a substantially U-shape having a disk radial direction outer side surface 3e, a disk radial direction inner side surface 3f, and a facing surface 3g connecting both side surfaces 3e, 3f. It has a stepped shape with the outer side recessed toward the outside of the caliper bracket, and the outer side surface 3h is disposed on the outer side of the caliper bracket with respect to the inner side surface 3i. Pad retainer mounting portions 3m and 3m having mounting surfaces 3k parallel to the disk radial direction outer surface 3e are provided on the outer sides of the pad guide grooves 3d and 3d in the disk radial direction, respectively. Each friction pad 6 is supported by ear pieces 6b and 6b projecting on both sides of the back plate 6a in pad guide grooves 3d and 3d on the disk feed-in side and the feed-out side via the pad retainer 10, respectively. .

  The pad retainer 10 includes a pair of retainer portions 10a and 10a mounted on the pad guide grooves 3d and 3d on both sides of the disc rotor, and the side opposite to the disc rotor of the retainer portions 10a and 10a. The pad return portions 10c and 10c extending to the disk rotor side via the elastic loop portions 10b and 10b (the elastic portion of the present invention) provided on the inner side, and the retainer portions 10a and 10a are prevented from falling off the disk rotor side. The pieces 10d, 10d, the attachment pieces 10e, 10e contacting the attachment surfaces 3k of the pad retainer attachment portions 3m, 3m of the caliper support arm 3a, and the upper portions of the attachment pieces 10e, 10e are connected across the outer edge of the disk rotor 2. It consists of a connecting piece 10f.

  Each retainer portion 10a connects the inner piece 10g and the outer piece 10h facing each other in the radial direction of the disk across the ear piece 6b of the friction pad 6, and connects these pieces 10g and 10h at the back of the pad guide grooves 3d and 3d. It consists of a back piece 10i. The rear side piece 10i has a groove opening side piece 10k laid on the inner side in the disk radial direction along the inner side surface 3i of the pad guide groove 3d, and is bent outwardly in the disk radial direction and toward the inner side of the pad guide groove. 10 m of groove | channel back side pieces laid along 3 h are each formed. Each inner piece 10g is formed so that the tip side is gradually inclined toward the outer side in the radial direction of the disk, and serves as a pad elastic portion that presses the friction pad 6 outward in the radial direction of the disk.

  Each elastic loop portion 10b is formed by bending an elongated piece extending from the groove rear side piece 10m to the opposite disk rotor side into an arc shape on the disk rotor side, and the pad return portion 10c is a bent portion of the elastic loop portion 10b. From the return end, the tip of the elongated piece extending in the direction of the disk rotor is inclined toward the opposite side piece 10m, and is bent back along the extending direction. . The pad returning portion 10c 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.

  Each drop-off preventing piece 10d is formed by bending an elongated piece extending from the outer piece 10h to the side opposite to the disk rotor in the outer side in the radial direction of the disk and bending the tip portion in an arc shape toward the disk rotor. When the ear piece 6b is inserted into the pad guide groove 3d, it can be elastically deformed outward in the radial direction of the disk, and in the state after the ear piece 6b is inserted, the tip 10n is the side of the anti-disk rotor of the ear piece 6b. A drop-off preventing portion 10p that contacts the 6d and prevents the friction pad 6 from falling off is formed.

  Each outer piece 10h is bent back along the tip surface of the pad retainer mounting portion 3m and extended toward the outer surface of the pad retainer mounting portion 3m in the radial direction of the disk so that the mounting piece 10e can be elastically deformed. Then, the pad retainer mounting portion 3m is sandwiched between the mounting piece 10e elastically deformed outward and the outer piece 10h. In addition, insertion guide pieces 10q are provided on the outer side of each inner piece 10g on the side opposite to the disc rotor so that the ear pieces 6b of the friction pad 6 can be easily inserted.

  The pad retainer 10 formed in this way is attached to the caliper support arm 3a with the pad retainer attachment portion 3m sandwiched between the attachment pieces 10e, 10e and the outer pieces 10h, 10h, and the inner piece 10g of each retainer portion 10a. The outer piece 10h is laid in contact with the disk radial direction outer side surface 3e and the disk radial direction inner side surface 3f of each pad guide groove 3d, and the groove opening side piece 10k of the heel side piece 10i is formed on the opposing surface 3g. A groove depth piece 10m is laid on the inner side surface 3i on the outer side surface 3h. With this attachment, each elastic loop portion 10b is disposed on the side opposite to the disk rotor of the caliper support arm 3a, and each pad return portion 10c is gradually formed in the pad guide groove 3d in the direction of the disk rotor from the elastic loop portion 10b. Each of them is disposed while being inclined toward the side opposite to the disk rotor. Further, the drop-off prevention portion 10p of each drop-off prevention piece 10d is disposed on the side opposite to the disc rotor of the caliper support arm 3a with the tip 10n facing inward in the disc radial direction.

  As shown in FIG. 6, each friction pad 6 has the ear pieces 6b, 6b of the back plate 6a inserted into the pad guide grooves 3d, 3d on the disk insertion / retraction side. First, as shown in FIG. 6 (a), each ear piece 6b is in a state where the inner surface 6g in the disk radial direction is brought into contact with the inner piece 10g of the pad retainer 10 and the outer side in the disk radial direction is inclined to the opposite disk rotor side. Then, the disk rotor side surface 6e is brought into contact with the dropout prevention portion 10p. From this state, as shown in FIG. 6B, the ear piece 6b is pressed to the disk rotor side while the drop prevention piece 10d is deformed on the disk rotor side face 6e so as to be parallel to the disk rotor 2. FIG. ), The ear piece 6b is inserted into the pad guide groove while further deforming the drop-off prevention piece 10d. When the ear piece 6b passes through the drop prevention part 10p and is inserted to a predetermined position in the pad guide groove 3d, the tip 10n of the drop prevention part 10p is opposite to the ear piece 6b as shown in FIG. 6 (d). Even if the ear piece 6b is urged to the side opposite to the disk rotor by the urging force of the pad return portion 10c, the ear piece 6b is restricted from moving from the temporary assembly position to the side opposite to the disk rotor. Further, it is possible to prevent the friction pad 6 in the temporarily assembled state from falling off the pad guide groove 3d.

  On the other hand, in the state after the ear piece 6b is inserted into the pad guide groove 3d as described above, the outer surface 6f in the disc rotation direction of the ear piece 6b abuts on the pad return portion 10c, and the pad return portion 10c is placed on the back side of the groove. A space E is formed between the outer surface 6f of the ear piece 6b in the disk rotation direction and the groove back piece 10m. Further, the inner radial surface 6g of the ear piece 6b presses the inner piece 10g toward the inner radial surface 3f of the pad guide groove 3d.

  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, the ear pieces 6b, 6b of the friction pads 6 are guided by the outer side pieces 10h, 10h of the retainer portions 10a, 10a at the disk radial direction outer surface 6h, and the disk radial direction inner side surface 6g of the ear pieces 6b, 6b. The inner pieces 10g and 10g are smoothly moved in the pad guide grooves 3d and 3d while being pressed against the inner surface 3f side in the disk radial direction. The inner pieces 10g, 10g are pressed against the inner surface 3f side in the disk radial direction by the ear pieces 6b, 6b, but the outer surface 6h in the disk radial direction of the ear pieces 6b, 6b by the elastic force of the inner pieces 10g, 10g. Are pressed against the outer side surfaces 3e and 3e in the disk radial direction of the pad guide grooves 3d and 3d.

  As a result, the disk radial outer surfaces 6h, 6h of the ear pieces 6b, 6b are always pressed against the disk radial outer surfaces 3e, 3e of the pad guide grooves 3d, 3d, so that the ear pieces 6b, 6b are pad guide grooves during braking. There is no rattling within 3d, 3d, and the striking sound of each friction pad 6 due to rattling can be suppressed, and brake squealing 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 retreat to the position before the start of braking, the elastic loop portions 10b and 10b and the pad return portions 10c and 10c will return to their initial shapes. Therefore, the ear pieces 6b, 6b that are in contact with the pad return portions 10c, 10c are pressed against the disc rotor side, and the friction pads 6 are forcibly separated from the side surfaces of the disc 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, when the lining 6c of the friction pad 6 starts to wear, the friction pad 6 gradually advances toward the disk rotor 2, and the ear pieces 6b and 6b come into contact with the tip side of the pad return portions 10c and 10c. Although the elastic force from the elastic loop portions 10b and 10b is reduced, the pad return portions 10c and 10c are formed in a curved shape along the extending direction. The force can be compensated, and the friction pad 6 can be reliably separated from the side surface of the disk rotor 2 regardless of the worn state of the lining 6c, and the play of the friction pad can be suppressed.

  Further, since the drop-off prevention part 10p of the drop-off prevention piece 10d is arranged on the side opposite to the disk rotor of the ear pieces 6b, 6b, the ear pieces 6b, 6b are pressed toward the side opposite to the disk rotor by the pad return parts 10c, 10c. Even so, it is possible to prevent the tip 10n of the drop prevention part 10p from coming into contact with the opposite disk rotor side surface 6d of the ear pieces 6b, 6b, and the ear pieces 6b, 6b from dropping out of the pad guide grooves 3d, 3d.

  Further, a space E is formed between the disk rotation direction outer side surface 6f of the ear piece 6b and the groove back side piece 10m, thereby ensuring a space for the pad return portions 10c and 10c to operate. The return portions 10c and 10c can be operated satisfactorily. Further, with this structure, the outer side in the disk radial direction of each ear piece 6b does not come into contact with the facing surface 3g of the pad guide groove 3d during braking, and only the inner side in the disk radial direction of each ear piece 6b faces the pad guide groove 3d. Since the braking torque is transmitted in contact with the surface 3g, it is possible to suppress the lifting of the friction pad on the disk entry side, particularly when performing a brake operation with a small load, and to suppress the occurrence of brake squealing. Can do.

  In addition, this invention is not restricted to each above-mentioned form example, The shape of a connection piece or an attachment piece, the shape of an insertion guide piece, and a formation location are arbitrary. Furthermore, the opposing surface of the pad guide groove is not limited to a stepped shape, and the space where the pad returning portion can be operated is provided, but the opposing surface of the pad guide groove is formed in a flat shape and the back side piece of the pad retainer Can be formed in a planar shape along the opposing surface, and the space can be provided by making the ear pieces stepped.

  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 ... outer surface, 3i ... inner surface, 3k ... mounting surface, 3m ... pad retainer mounting portion, 4 ... slide pin, 5 ... caliper body, 5a ... action portion, 5b ... reaction portion 5c: Bridge portion, 5d: Car body mounting arm, 5e: Reaction force claw, 6 ... Friction pad, 6a ... Back plate, 6b ... Ear piece, 6c ... Lining, 6d ... Anti-disc rotor side, 6e ... Disc rotor side, 6f: Disc rotation direction outer side surface, 6g: Disc radial direction inner side surface, 6h ... Disc radial direction outer side surface, 7 ... Cylinder hole, 8 ... Piston, 9 ... Hydraulic chamber, 10 ... Pa Dretainer, 10a ... Retainer part, 10b ... Elastic loop part, 10c ... Pad return part, 10d ... Fall-off prevention piece, 10e ... Mounting piece, 10f ... Connection piece, 10g ... Inner piece, 10h ... Outer piece, 10i ... Back piece 10k ... groove opening side piece, 10m ... groove back side piece, 10n ... tip, 10p ... drop-off prevention part, 10q ... insertion guide piece

Claims (3)

A pair of caliper support arms that straddle the outer edge of the disk rotor in the disk axial direction is extended to a caliper bracket that is fixed to the vehicle body. The caliper support arms include a disk radial outer surface, a disk radial inner surface, and both sides. U-shaped pad guide grooves having opposing surfaces connecting the surfaces are provided to face each other, and ear pieces are respectively provided on both side portions of the back plate of the friction pad arranged with the disc rotor interposed therebetween. The pad retainer is supported in the pad guide groove via a pad retainer, and the pad retainer extends between the pair of retainer portions laid in the pad guide grooves on both sides of the disk rotor and the outer edge of the disk rotor. In the vehicle disc brake comprising a connecting piece for connecting the friction pad and a pad return portion for urging the friction pad in a direction opposite to the disc rotor, the retainer portion is An inner piece that contacts the inner surface in the radial direction of the disk, an outer piece that is laid on the outer surface in the radial direction of the disk, and a rear piece that is laid on the opposing surface by connecting the outer piece and the inner piece. The outer piece is formed by bending an elongated piece extending from the side of the outer piece opposite to the disk rotor and bending the tip end in an arc shape toward the disk rotor, The ear piece can be elastically deformed in a direction allowing insertion of the ear piece into the pad guide groove, and the tip of the ear piece comes into contact with the opposite side of the disk rotor of the ear piece in a state where the ear piece is inserted into the pad guide groove. A disc brake for a vehicle, wherein a drop-off preventing piece is formed. 2. The disc brake for a vehicle according to claim 1, wherein the inner piece is formed such that a tip side thereof is gradually inclined toward an outer side in the disc radial direction. The pad return portion is formed by bending back the elongated piece extending from the opposite disk rotor side of the back piece to the disk rotor side to form an elastic portion, and further extending the distal end side of the elongated piece toward the disk rotor, 3. The vehicle disc brake according to claim 1, wherein the tip end portion is inclined toward one side opposite to the back side, and is bent back along the extending direction. 4.

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