JP6231322B2 - Vehicle disc brake - Google Patents

Description

  The present invention relates to a vehicle disc brake, and more specifically, a friction pad ear piece is supported in a pad guide groove provided in a bracket fixed to a vehicle body, and the friction pad is suspended so as to be movable in the disc axial direction. The present invention relates to a vehicle disc brake.

  Conventionally, in a vehicle disc brake in which an ear piece protruding from a friction pad back plate is supported in a pad guide groove provided in a bracket fixed to a vehicle body, a shim plate is provided on the side of the disc rotor opposite to the friction pad back plate. The brake squeal is suppressed by arranging it, but on this shim plate, a pad return piece that urges the friction pad toward the disk rotor side when releasing the brake is formed integrally to suppress drag of the friction pad (For example, refer to Patent Document 1).

JP 2006-153139 A

  However, in the above-mentioned Patent Document 1, the pad return piece is configured such that the upright piece extending to the side opposite to the disk rotor is bent back to the disk rotor side so that the tip is brought into contact with the side face of the bracket opposite to the disk rotor. Therefore, the structure is complicated and the cost is high, and the assembly is troublesome.

  SUMMARY OF THE INVENTION Accordingly, the present invention provides a vehicle disc brake capable of preventing the friction pad from being dragged by integrally forming a pad return piece on the shim plate and reducing the cost and improving the assemblability. It is an object.

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. In addition, U-shaped pad guide grooves are provided opposite to each other, and the back plate of the friction pad disposed with the disc rotor interposed therebetween is supported by the pad guide grooves on both sides of the disc main body in the disc rotation direction. In the vehicular disc brake having a shim plate on the side of the back plate opposite to the disc rotor, the back plate is located on both sides of the disc on the side of the disc disc rotor on the side of the disc disc rotor. and, in the radial direction of the disk center, projecting shim plate mounting projections respectively, the shim plate, and the shim body portion which is laid on the backing plate body portion, of the shim body portion The disc rotation direction side portions, Rutotomoni provided projecting respectively outwardly disk rotational direction, the caliper from the disc rotor side surface of the support arm abuts, and a pair of pad-return piece for biasing the friction pad from the disc rotor side The shim body is formed with an insertion hole at an outer end of the shim body in the disk rotation direction and at a position corresponding to the protrusion for mounting the shim plate, and the shim plate is inserted into the insertion hole. The mounting projection is fixed by caulking and fixed to the back plate.

Also, the pad retainer is disposed between the front Symbol ears and the pad guide groove, the said pad retainer, may escape portion that does not contact with the pad back piece is formed.

  According to the vehicle disc brake of the present invention, when the friction pad moves to the disc rotor side during braking, the pad return piece bends while maintaining the state where the protruding end side is in contact with the side opposite to the disc rotor of the caliper support arm, When the braking operation is released, the pad return piece attempts to return to the initial shape, so that the friction pad can be forcibly separated from the side surface of the disk rotor, and dragging of the friction pad can be prevented. Furthermore, since the structure of the pad return piece formed on the shim plate is simple, the shim plate suppresses brake squeal and drag of the friction pad, while reducing costs and improving assembly. Can be planned.

  In addition, since the fixing part for fixing the shim plate to the back plate body part is provided at the outer end of the shim body in the disk rotation direction, the shim plate can be fixed to the back plate body part in the vicinity of the pad return piece. Even if the pad return piece is bent sometimes, the shim plate can be securely fixed to the back plate body. Further, the fixing portion is provided by inserting the insertion hole formed in the shim main body portion into the shim plate mounting protrusion formed in the back plate main body portion and fixing it by caulking to thereby fix the shim plate to the friction pad. Can be easily assembled to the back plate. In addition, a pad retainer is disposed between the ear piece and the pad guide groove, and the pad retainer is provided with a relief portion that does not contact the pad return piece, so that the pad retainer can operate as a pad return piece. There is no risk of damage.

1 is a front view of a vehicle disc brake showing an embodiment of the present invention. It is II-II sectional drawing of FIG. FIG. 3 is a sectional view taken along line III-III in FIG. 1. It is a principal part expanded sectional view of the disc brake for vehicles which shows one example of this invention. It is a sectional top view at the time of friction pad wear similarly of a disk brake for vehicles. It is a principal part expanded sectional view at the time of friction pad wear 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.

  FIG. 1 to FIG. 8 are views showing one embodiment of a vehicle disc brake according to the present invention, and an arrow A indicates a rotation direction of a disc rotor that rotates integrally with a wheel when the vehicle moves 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. A pair of friction pads 6 and 6 are provided.

  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 extends along the side wall toward the center of the disk. The tip portions of the caliper support arms 3a and 3a are connected to a tie rod 3b to increase the rigidity of the caliper support arms 3a and 3a to which braking torque is applied.

  Each caliper support arm 3a is provided with a guide hole for accommodating the above-described slide pin 4, and the four caliper support arms 3a and 3a are provided with four pad guides facing each other on each side of the disc rotor 2. A groove 3d 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.

  Each friction pad 6 is configured by fixing a lining 6a that is in sliding contact with the side surface of the disk rotor 2 to a metal back plate 6b. The back plate 6b is a back plate main body portion 6c to which the lining 6a is attached. A pair of ear pieces 6d and 6d, which are respectively supported by the pad guide groove 3d, protrude from both sides of the disk in the disk rotation direction. Further, on both sides of the back plate main body 6c on the side opposite to the disk rotor in the disk rotation direction, a shim plate mounting protrusion 6e is provided at the center position in the disk radial direction. The shim plate 10 is fixed by caulking, and a pad retainer 11 is interposed between the ear piece 6d and the pad guide groove 3d.

  The shim plate 10 is formed of a thin metal plate and protrudes outward from the both sides of the shim main body 10a laid on the back plate main body 6c and the disc main body 10a in the disk rotation direction. A pair of pad return pieces 10b, 10b that abut against the anti-disk rotor side surface 3h of the support arm 3a and urge the friction pad 6 toward the anti-disk rotor side are provided. The pad return piece 10b is braked with the lining 6a of the friction pad 6 fully worn, and when the lining 6a of the friction pad 6 comes into sliding contact with the disk rotor 2, the protruding end side is the anti-disk rotor of the caliper support arm 3a. The length is formed so as to be able to contact the side surface 3h. In addition, insertion holes 10c and 10c are provided at positions corresponding to the shim plate mounting protrusions 6e and 6e at the outer end of the shim body 10a in the disk rotation direction, and the insertion holes 10c and 10c are connected to the shim plate. Fixing portions P1 and P1 for fixing the shim plate 10 to the back plate 6b are formed by inserting and crimping the mounting projections 6e and 6e.

  The pad retainer 11 supports the caliper across the pair of retainer portions 11a and 11a attached to the pad guide grooves 3d and 3d on both sides of the disc rotor and the outer edge of the disc rotor 2 on the disc introduction side or the disc delivery side. It consists of attachment pieces 11b and 11b that contact the attachment surfaces 3j and 3j of the pad retainer attachment portions 3i and 3i of the arm 3a, and a connecting piece 11c that straddles the outer edge of the disk rotor 2 and connects the upper portions of the attachment pieces 11b and 11b. ing.

  Each retainer portion 11a connects the inner piece 11d and the outer piece 11e facing the inner and outer sides in the disk radial direction across the ear piece 6d of the friction pad 6, and connects these pieces 11d and 11e at the back of the pad guide grooves 3d and 3d. The back piece 11f is provided, and the outer piece 11e and the back piece 11f are connected at right angles. The inner piece 11d extends from the inner end of the rear side piece 11f in the disk radial direction so as to incline toward the outer side in the disk radial direction. Further, the back side piece 11f is formed with a relief portion 11g at a position corresponding to the pad return piece 10b to allow the pad return piece 10b to be deformed when braking and releasing the brake.

  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. Next, by this reaction force, the caliper body 5 moves in the direction of the action part while being guided by the slide pins 4, 4, and the reaction force claw 5 e presses the friction pad 6 on the reaction part side against the other side of the disk rotor 2. .

  At this time, the ear pieces 6d, 6d of each friction pad 6 are urged outward in the radial direction of the disk by the inner pieces 11d, 11d of the pad retainer 11, while being guided by the outer piece 11e, Move smoothly in 3d. Further, along with this movement, the pad return pieces 10b and 10b are bent while maintaining the state where the protruding end side is in contact with the opposite disk rotor side surfaces 3h and 3h of the caliper support arms 3a and 3a.

  On the other hand, when the above-described braking operation is canceled and the piston 8 and the reaction force claw 5e retreat to the position at the start of braking, the pad return pieces 10b and 10b attempt to return to the initial shape. The friction pads 6 are pulled back from the side surfaces of the disk rotor 2 by the restoring force of 10b and 10b, and the friction pads 6 are forcibly separated from the side surfaces 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 can be suppressed, and brake noise can be suppressed. Further, when braking or releasing the brake, the back side pieces 11f and 11f of the pad retainer 11 are formed with relief portions 11g and 11g, so that the pad return pieces 10b and 10b do not come into contact with the pad retainer 11. It can be deformed well.

  Further, as shown in FIGS. 5 and 6, when the braking operation is performed with the lining 6a of the friction pad 6 fully worn and the friction pad 6 moves to the disk rotor side, the tip end side of the pad return piece 10b is the caliper. Since the support arm 3a is in contact with the anti-disk rotor side surface 3h, the friction pad 6 can be favorably biased toward the anti-disk rotor side when braking is released. Even if the pad return piece 10b is greatly bent, the pad return piece 10b is allowed to be deformed by the escape portion 11g, so that the pad return piece 10b can be reliably operated.

  Thus, in this embodiment, since the structure of the pad return pieces 10b and 10b formed on the shim plate 10 is simple, the shim plate 10 suppresses suppression of brake squeal and dragging of the friction pad 6, Costs can be reduced and assembly can be improved. In addition, since the shim plate 10 has the fixing portions P1 and P1 formed outside the shim main body portion 10a in the disk rotation direction and in the vicinity of the pad return piece 10b, the pad return pieces 10b and 10b are bent during braking. However, the shim plate 10 can be securely fixed to the back plate main body portion 6c. Further, the fixing portion P1 is provided by inserting the insertion hole 10c formed in the shim main body portion 10a into the shim plate mounting protrusion 6e formed on the back plate main body portion 6c, and fixing the caulking. The plate 10 can be easily assembled to the back plate 6 b of the friction pad 6. Also, a pad retainer 11 is disposed between the ear piece 6d and the pad guide groove 3d, and the pad retainer 11 is provided with a relief portion 11g that does not contact the pad return piece 10b. The movement of the ear piece 6d in the disc axial direction can be guided well, and the pad retainer 11 does not have a risk of impairing the operability of the pad return piece 10b.

  In addition, this invention is not restricted to the above-mentioned form example, The shape of a pad retainer is arbitrary and should just not impair the operativity of a pad return piece. Further, the fixing portion for fixing the shim plate and the back plate of the friction pad is not limited to the caulking and fixing, and the position and number provided are arbitrary. Furthermore, the present invention is not limited to being applied to a pin slide type disc brake, but can also be applied to a piston facing type disc brake.

  DESCRIPTION OF SYMBOLS 1 ... Vehicle disc brake, 2 ... Disc rotor, 3 ... Caliper bracket, 3a ... Caliper support arm, 3b ... Tie rod, 3d ... Pad guide groove, 3e ... Disc radial outer side surface, 3f ... Disc radial inner side surface, 3g ... opposing surface, 3h ... anti-disk rotor side surface, 3i ... pad retainer mounting part, 3j ... mounting surface, 4 ... slide pin, 5 ... caliper body, 5a ... action part, 5b ... reaction part, 5c ... bridge part, 5d ... Body mounting arm, 5e ... reaction force claw, 6 ... friction pad, 6a ... lining, 6b ... back plate, 6c ... back plate body, 6d ... ear piece, 6e ... shim mounting projection, 7 ... cylinder hole, 8 ... Piston, 9 ... Hydraulic chamber, 10 ... Shim plate, 10a ... Shim body, 10b ... Pad return piece, 10c ... Insertion hole, 11 ... Pad retainer, 11a ... Retainer part, 11b ... Mounting piece, 1c ... connecting piece, 11d ... inner piece, 11e ... outer piece, 11f ... rear side piece, 11g ... escape portion

Claims (2)

A caliper bracket fixed to the vehicle body is extended with a pair of caliper support arms that straddle the outer edge of the disk rotor in the disk axial direction, and a U-shaped pad guide groove is provided facing the caliper support arms, The back plate of the friction pad disposed across the disc rotor has a pair of ear pieces supported on the pad guide groove on both sides of the back plate main body in the disc rotation direction, and the anti-disc of the back plate. In a vehicle disc brake having a shim plate on the rotor side,
The back plate has shim plate mounting protrusions projecting from both sides of the disk rotor in the disk rotation direction on the side opposite to the disk rotor of the back plate, and at the center position in the disk radial direction,
The shim plate protrudes from the shim main body laid on the back plate main body portion and both sides of the shim main body in the disc rotation direction to the outer side in the disc rotation direction, and contacts the opposite disc rotor side surface of the caliper support arm. contact, Rutotomoni and a pair of pad-return piece for biasing the friction pad from the disc rotor side, in the disk rotational direction outer end portion of the shim body portion, and, corresponding to the shim plate mounting protrusions Insertion holes are formed at each position,
The disc brake for a vehicle according to claim 1, wherein the shim plate is fixed to the back plate by caulking and fixing the shim plate mounting protrusion inserted into the insertion hole. The pad retainer is disposed between the ear piece and the pad guide groove, and the pad retainer is formed with a relief portion that does not contact the pad return piece . Disc brake for vehicles.

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