JP4221343B2 - Pin slide type vehicle disc brake - Google Patents

Description

  The present invention relates to a pin slide type vehicle disc brake used in vehicles such as automobiles and motorcycles. More specifically, the present invention relates to a pad guide groove formed on a caliper support arm, and an ear piece protruding from a back plate of a friction pad. The present invention relates to a structure of a pad retainer that is slidably supported in a disk axial direction via a retainer.

  The pin slide type disk brake for a vehicle has a working part arranged on one side of the disk rotor and a reaction part arranged on the other side of the disk rotor as a bridge part straddling the outside of the disk rotor. The caliper bodies connected together are supported by a caliper bracket fixed to the vehicle body on one side of the disk rotor so as to be slidable in the disk axial direction via a pair of slide pins arranged outside the disk rotor. In addition, a pair of friction pads are disposed opposite to each other with the disk rotor interposed between the action portion and the reaction portion, and the friction pads are held by the caliper bracket.

The caliper bracket has a pair of caliper support arms extending across the outer periphery of the disk rotor in the disk axial direction, a torque receiving surface for supporting the braking torque from the friction pad on both the caliper support arms, and a friction pad. There are provided pad guide grooves for accommodating ear pieces projecting from both sides of the back plate so as to be movable in the disk axial direction, and between the torque receiving surface and the pad guide groove and the back plate of the friction pad. A pad retainer formed of a metal thin plate is interposed. The pad retainer is provided with an elastic holding piece that presses and holds the friction pad toward the outer periphery of the disk rotor, and suppresses vibration of the friction pad and the like (for example, see Patent Document 1).
JP-A-9-229112

  The pad retainer described in Patent Document 1 is provided with an elastic holding piece for urging the ear piece in the disk rotor rotation direction and the disk rotor outer circumferential direction at a portion inserted into the pad guide groove. However, since the torque receiving surface for supporting the braking torque from the friction pad is provided on the bottom surface of the pad guide groove facing the protruding end of the ear piece, the elastic holding piece is deformed by receiving the braking torque from the friction pad. In addition to being easy to do, the spring action part for pressing the ear piece in the disk rotor outer peripheral direction has a small shape protruding from the intermediate position of the disk rotor inner peripheral wall surface of the pad guide groove in the disk rotor outer peripheral direction. However, there is a problem that the pressing force acting on the outer periphery of the disk rotor acting on the ear piece is unstable due to a slight manufacturing error.

  SUMMARY OF THE INVENTION Accordingly, the present invention provides a pin slide type vehicle disk brake capable of stabilizing the pressing force of an elastic holding piece that presses an ear piece projecting on both sides of a back plate of a friction pad toward the outer periphery of the disk rotor. It is an object.

In order to achieve the above object, the pin slide type vehicle disc brake of the present invention has a caliper bracket fixed to a vehicle body, and a pair of caliper support arms extending across the outer periphery of the disc rotor in the disc axial direction. Ear pieces accommodated in the pad guide grooves on both sides of the back plate of a pair of friction pads formed with a pad guide groove and a torque receiving surface facing the caliper support arm, respectively, and disposed between the disc rotors. And a pad retainer is interposed between the back plate of the friction pad and the caliper support arm, and the braking torque from the friction pad is supported by the torque receiving surface via the pad retainer. the pad retainer, a pin provided with the pad guide lugs holding portion formed of elastic holding pieces for pressing the lug in the disc rotor outer circumferential direction at the groove In the disc brake ride type vehicle, the ear piece holding section comprises a lug sliding piece along the disk rotor outer peripheral side wall surface of the pad guide groove, from the tip of the ear piece sliding piece of the bottom surface of the pad guide groove A bent piece along the outer periphery of the disk rotor and a central portion in the disk axial direction at the tip of the bent piece are curved in an arc from the middle position of the bottom surface of the pad guide groove toward the inner peripheral side wall surface of the disk rotor. An elastic fitting piece that presses the surface against the inner circumferential side wall surface of the disk rotor of the pad guide groove, and the elastic fitting piece between the elastic fitting pieces on both sides of the elastic fitting piece so as to sandwich the elastic fitting piece from the bottom intermediate position of the pad guide groove an arcuate of the elastic retaining piece that is curved in the direction to protrude from the groove opening bulges in the disc rotor peripheral side wall direction, is provided at the distal end of the circular arc portion, the disc the ear piece It is characterized in that a pressing piece for pressing the over data circumferentially.

  The pin slide type vehicle disc brake according to the present invention supports the braking torque from the friction pad by the torque receiving surface provided separately from the pad guide groove, so that the elastic holding piece disposed in the pad guide groove has the braking torque. Will not deform. The elastic holding piece bulges from the intermediate position of the bottom surface of the pad guide groove toward the inner circumferential side wall surface of the disk rotor, and the elastic holding piece is formed in an arc shape curved in a direction protruding from the groove opening. The ear piece can be pressed in a stable state in the outer circumferential direction of the disk rotor without being affected by manufacturing errors. Thereby, the movement of the friction pad in the disk axis direction is also smooth, and the vibration of the friction pad can be suppressed to suppress brake noise.

  Hereinafter, the present invention will be described in detail with reference to the drawings. 1 to 6 show an embodiment in which the present invention is applied to a pin slide type vehicle disc brake having a hydraulic operating mechanism operated by a brake pedal and a mechanical operating mechanism operated by a hand lever. 1 is a cross-sectional view of the main part of the disc brake, FIG. 2 is a partial cross-sectional rear view of the disc brake, FIG. 3 is a perspective view of the pad retainer, FIG. 4 is a front view of the disc brake, and FIG. FIG. 6 is a partial cross-sectional plan view of the disc brake.

  The arrow A in the figure indicates the direction of rotation of the disc rotor during forward traveling of the vehicle, and the disc insertion side and disc outlet side used in the following description are for the case of forward traveling of the vehicle.

  A pin slide type disc brake 1 includes a caliper bracket 3 fixed to a vehicle body at one side of a disc rotor 2, and a caliper supported by the caliper bracket 3 through a slide pin 4 so as to be movable in the disc axial direction. It is formed by a body 5 and a pair of friction pads 6 and 6 which are disposed opposite to each other with the disk rotor 2 interposed between the action part 5a and the reaction part 5b of the caliper body 5.

  The caliper bracket 3 includes a vehicle body fixing portion 3a disposed on one side surface portion of the disk rotor 2, and a pair of members extending from both ends of the vehicle body fixing portion 3a and straddling the outer periphery of the disk rotor 2 in the disk axial direction. And caliper support arms 3b. The caliper support arm 3b protrudes in the disc axial direction across the outside of the disc rotor 2 from the pair of friction pad holding portions 3c on the vehicle body fixing portion side and the front ends of the friction pad holding portions 3c on the vehicle body fixing portion side. A pair of caliper support portions 3d and a pair of friction pad holding portions on the side opposite to the vehicle body fixed portion that protrudes from the protruding end of the caliper support portion 3d along the other side surface portion of the disk rotor 2 in the inner circumferential direction of the disk rotor. 3c and a tie rod 3e for connecting the disk rotor inner peripheral side ends of the pair of friction pad holding portions 3c on the side opposite to the vehicle body fixing portion, the vehicle body fixing portion 3a, the friction pad holding portion 3c, The caliper support portion 3d and the tie rod 3e are formed in a substantially U shape that bypasses both sides of the friction pad 6 and the inner peripheral side of the disk rotor as a whole.

  Fastening bolt mounting portions 3f each having a female screw hole for screwing a fastening bolt for mounting the vehicle body are provided at both end portions of the vehicle body fixing portion 3a. Each friction pad holding portion 3c has a disk rotor. A torque receiving surface 3g is provided on the inner surface of the outer peripheral side, and a pad guide groove 3h in the disk axial direction is provided on the inner surface of the intermediate portion so as to face each other. The caliper support portion 3d is formed in a straight line having a length extending from the end of the reaction portion 5b to the action portion 5a, and a bag-like pin insertion hole 3i serving as a slide pin mounting portion is formed inside the caliper support portion 3d. The opening is provided.

  The caliper body 5 includes the above-described action portions 5 a and reaction portions 5 b that are arranged to face both sides of the disk rotor 2, and a bridge portion 5 c that connects the outer sides of the disk rotor 2. A vehicle body attachment arm 5d protrudes along one side surface of the disk rotor 2 on the disk rotor turn-in side and the turn-out side of the action portion 5a, and a slide pin 4 is provided at the tip of each vehicle body attachment arm 5d. Projecting in parallel with the disc axis. Both slide pins 4 are respectively inserted into the pin insertion holes 3i of the caliper support portion 3d, and the caliper body 5 is guided by the slide pins 4 to move in the disk axial direction.

  The action portion 5a is provided with a hydraulic operation mechanism 8 operated by a brake pedal (not shown) and a mechanical operation mechanism 9 operated by a hand lever (not shown). The hydraulic operating mechanism 8 is mainly used when the vehicle is running while the disc rotor 2 is rotating, and the mechanical operating mechanism 9 is used when the vehicle is parked when the disc rotor 2 stops rotating or when starting a hill.

  A cylinder hole 10, a connecting hole 11, and a bearing hole 12 are connected to the inside of the action portion 5a. The cylinder hole 10 is opened to the disk rotor side, and the piston 13 of the hydraulic operation mechanism 8 is disposed on the disk rotor side of the cylinder hole 10. A sleeve piston 14, a push rod 15, and a camshaft 16 of the mechanical operation mechanism 9 are disposed on the bottom side of the cylinder hole 10, the connecting hole 11 and the bearing hole 12 continuing to the cylinder hole 10, and the piston of the hydraulic operation mechanism 8. An adjuster 19 using an adjusting nut 17 and an adjusting bolt 18 is interposed between the actuator 13 and the sleeve piston 14 of the mechanical operating mechanism 9. The bearing hole 12 is open to the side surface of the action portion 5a, and a cam lever 20 is pivotally attached to the outer end of the cam shaft 16 projecting outside from the bearing hole 12, and the cam lever 20 is interposed between the cam lever 20 and the hand lever. Are connected to a wire cable (not shown).

The reaction portion 5b is provided with a pair of reaction force claws 5e protruding toward the inner peripheral side of the disk rotor, and between the piston 13 of the action portion 5a and the reaction force claws 5e of the reaction portion 5b, A friction pad 6 is disposed opposite to the disc rotor 2. Each friction pad 6 includes a lining 6a that is in sliding contact with the side surface of the disk rotor 2, and a metal back plate 6b that holds the lining 6a. The back plate 6b is provided with ear pieces 6c protruding on both sides, and the friction pads 6 can slide in the disk axial direction by inserting the ear pieces 6c into the pad guide groove 3h via the pad retainer 21. Supported by A wear indicator 22 that emits an alarm sound that is in sliding contact with one side surface of the disk rotor 2 when the lining 6a is worn by a predetermined amount is provided on the disk entry-side ear piece 6c of the working portion side friction pad 6.
The pad guide groove 3h has a U-shaped cross section, and the ear piece 6c is formed in a square shape smaller than the pad guide groove 3h, and the protruding end of the bottom surface 3j of the pad guide groove 3h and the ear piece 6c. A sufficient interval is provided between the two. Further, between the disk rotor inner peripheral side wall surface 3k of the pad guide groove 3h and the disk rotor inner peripheral side outer surface of the ear piece 6c, the elastic holding piece 21a of the pad retainer 21 is provided on the inner periphery of the disk rotor of the pad guide groove 3h. The space | interval which can be arrange | positioned without contacting the side wall surface 3k is provided.

  The pad retainer 21 is formed by punching a metal thin plate into a predetermined shape and bending or curving a predetermined position, and each pad guide on both sides of the disk rotor on the disk entry side or the disk delivery side. A pair of ear piece holding portions 21b disposed in the groove 3h, a connecting piece 21c that connects the upper portions of both ear piece holding portions 21b across the outer periphery of the disc rotor 2, and a disc from the intermediate portion of the connecting piece 21c. A torque that projects along the torque receiving surface 3g between the mounting piece 21d that protrudes toward the inner periphery of the rotor and engages with the rotor groove 3m of the caliper support arm 3b, and the ear piece holding portion 21b and the connecting piece 21c. Receiving piece 21e.

  Each of the ear piece holding portions 21b includes an ear piece sliding piece 21f bent at a substantially right angle from the inner peripheral end of the disk rotor of the torque receiving piece 21e along the disc rotor outer peripheral side wall surface 3n of the pad guide groove 3h, and the ear piece. A bent piece 21g bent at a substantially right angle from the tip of the sliding piece 21f along the disk rotor outer peripheral side portion of the bottom surface 3j of the pad guide groove 3h, and a pad guide groove at the center of the bent piece 21g in the disk axial direction. An elastic fitting piece 21h that is curved in an arc shape from the middle position of the bottom surface 3j of 3h toward the disk rotor inner peripheral wall surface 3k, and whose tip outer peripheral surface is pressed against the disk rotor inner peripheral wall surface 3k of the pad guide groove 3h; The disk rotor inner peripheral side wall surface 3k from the middle of the bottom surface 3j of the pad guide groove 3h so that the elastic fitting piece 21h is sandwiched between the ends of the bent pieces 21g on both sides of the elastic fitting piece 21h. Bulges, pressing piece 21i of the tip is provided with said resilient retaining pieces 21a of the shaped arc curved in a direction projecting from the groove opening 3o. Further, guide pieces 21j that are open to the outside are provided on the opposite ends of the torque receiving piece 21e and the ear piece sliding piece 21f, respectively, so that the friction pad 6 can be easily attached.

  The pressing piece 21i at the tip of the elastic holding piece 21a is longer in the disk axial direction on the action part 5a side than on the reaction part 5b side in consideration of the amount of movement accompanying the wear of the linings 6a of the friction pads 6 with respect to the pad retainer 21. Although formed, both pressing pieces 21i can be formed symmetrically with the same length.

In the pad retainer 21 formed in this way, each ear piece holding portion 21b is inserted into each pad guide groove 3h, the connecting piece 21c is arranged along the caliper support portion 3d, and the mounting piece 21d is placed in the rotor groove 3m. It is attached to the caliper bracket 3 in a locked state. At this time, the elastic fitting piece 21h is in a state in which the outer peripheral surface of the tip is pressed against the disk rotor inner peripheral side wall surface 3k of the pad guide groove 3h and the ear piece holding portion 21b is fixed at a predetermined position in the pad guide groove 3h. The elastic holding piece 21a passes through the vicinity of the disk rotor inner peripheral side wall surface 3k from the middle position of the bottom surface 3j of the pad guide groove 3h in a non-contact state, and the pressing piece 21i at the tip protrudes from the groove opening 3o toward the disk rotor outer circumferential direction. The arc is drawn.

  When the ear piece 6c that is attached to the friction pad 6 and protrudes on both sides of the back plate 6b is inserted into the pad guide groove 3h, the outer surface 6d of the inner side of the disc rotor of the ear piece 6c is pushed by the pressing piece 21i of the elastic holding piece 21a. The disk rotor outer peripheral side outer surface 6e of the ear piece 6c is pressed and held by the ear piece sliding piece 21f. In this state, the pressing piece 21i is provided at the tip of the elastic holding piece 21a curved from the middle position of the bottom surface 3j of the pad guide groove 3h, so that the elastic fitting piece 21h acting as a spring has a sufficient length. And the pressing force of the ear piece 6c by the pressing piece 21i can be stabilized. Thereby, the movement of the friction pad 6 in the disc axial direction also becomes smooth, and the vibration of the friction pad 6 can be suppressed to suppress brake noise.

  This embodiment is configured as described above, and is attached to the vehicle body by screwing the fastening bolt inserted from the vehicle body side into the fastening bolt mounting portion 3f of the caliper bracket 3. When the brake operation using the hydraulic operation mechanism 8 or the mechanical operation mechanism 9 is performed, the piston 13 is pushed out from the cylinder hole 10 toward the disk rotor, and the back plate 6b of the friction pad 6 on the acting portion side pushes the pad retainer 21. And the lining 6a of the friction pad 6 is brought into sliding contact with one side surface of the disk rotor 2. Due to this reaction, the caliper body 5 slides in the direction of the action part while being guided by the slide pin 4, and the reaction force claw 5 e of the reaction part 5 b is connected to the back plate 6 b of the friction pad 6 on the reaction part side via the pad retainer 21. Moving toward the disk rotor, the lining 6a of the friction pad 6 is brought into sliding contact with the other side of the disk rotor 2 to perform a braking action.

  In the brake operation during forward running, the friction pad 6 is dragged to the disc delivery side in the direction of arrow A by sliding contact with the disc rotor 2, and the disc delivery side end surface of the back plate 6 b is the torque receiving piece of the pad retainer 21. Each of the friction pad holding portions 3c is pressed against the torque receiving surface 3g via 21e. Therefore, the braking torque generated in the friction pad 6 is transmitted to the friction pad holding portion 3c of the caliper bracket 3 through the torque receiving surface 3g, and is not transmitted from the ear piece 6c to the ear piece holding portion 21b, so that the elastic holding piece 21a is deformed. The pressing force of the ear piece 6c by the pressing piece 21i does not change.

It is principal part sectional drawing of the disc brake which shows one example of this invention. It is a partial cross-section rear view of the disc brake. It is a perspective view of a pad retainer similarly. It is a front view of a disk brake similarly. It is VV sectional drawing of FIG. It is a partial cross section top view of a disk brake similarly.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... Disc brake, 2 ... Disc rotor, 3 ... Caliper bracket, 3a ... Car body fixed part, 3b ... Caliper support arm, 3c ... Friction pad holding part, 3d ... Caliper support part, 3e ... Tie rod, 3f ... Fastening bolt installation Part, 3g ... torque receiving surface, 3h ... pad guide groove, 3i ... pin insertion hole, 3j ... bottom surface, 3k ... disk rotor inner peripheral side wall surface, 3m ... rotor groove, 3n ... disc rotor outer peripheral side wall surface, 3o ... groove opening 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 ... Ear piece, 6d ... Disc rotor inner peripheral side outer surface, 6e ... Disc rotor outer peripheral side outer surface, 8 ... Hydraulic operating mechanism, 9 ... Mechanical operating mechanism, 10 ... Cylinder hole, 11 ... Ream Hole, 12 ... Bearing hole, 13 ... Piston, 14 ... Sleeve piston, 15 ... Push rod, 16 ... Camshaft, 17 ... Adjust nut, 18 ... Adjust bolt, 19 ... Adjuster, 20 ... Cam lever, 21 ... Pad retainer, 21a ... elastic holding piece, 21b ... ear piece holding part, 21c ... connecting piece, 21d ... mounting piece, 21e ... torque receiving piece, 21f ... ear piece sliding piece, 21g ... bent piece, 21h ... elastic fitting piece, 21i ... Pressing piece, 21j ... guide piece, 22 ... wear indicator

Claims (1)

A pair of caliper support arms that extend across the outer circumference of the disk rotor in the disk axial direction is extended to a caliper bracket fixed to the vehicle body, and a pad guide groove and a torque receiving surface are formed on both the caliper support arms to face each other. Ear pieces received in the pad guide grooves are respectively provided on both side portions of the back plate of the pair of friction pads arranged with the disc rotor interposed therebetween, and the back plate of the friction pad and the caliper support arm A pad retainer is interposed therebetween, and braking torque from the friction pad is supported by the torque receiving surface via the pad retainer. The ear piece is mounted on the pad retainer in the pad guide groove. in the pin slide-type disc brake for a vehicle provided with a lug holding part formed an elastic holding piece for pressing in the direction, the ears holding portion, said Paddoga Ear piece sliding piece along the disk rotor outer peripheral side wall surface of the grooved groove, a bent piece extending from the tip of the ear piece sliding piece to the disk rotor outer peripheral side portion of the bottom surface of the pad guide groove, and a disk at the tip of the bent piece Elasticity that is curved in an arc from the middle position of the bottom surface of the pad guide groove toward the inner circumferential side wall surface of the disk rotor and presses the outer peripheral surface of the tip against the inner circumferential side wall surface of the disk rotor of the pad guide groove A direction that bulges from the intermediate position of the bottom surface of the pad guide groove toward the inner peripheral side wall surface of the disk rotor and protrudes from the groove opening so that the elastic fitting piece is sandwiched between the fitting piece and the bent piece tips on both sides of the elastic fitting piece an arcuate said resilient retaining pieces curved, provided at the tip of the circular arc portion, the pin slide-type vehicle is characterized in that a pressing piece for pressing the lug in the disc rotor outer circumference Use disc brakes.

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