JP4288197B2 - Vehicle disc brake - Google Patents

Description

  The present invention relates to a vehicle disc brake used for an automobile or a motorcycle, and more particularly to a pin slide type vehicle disc brake.

  In the pin slide type disc brake, the action portion arranged on one side of the disc rotor and the reaction portion arranged on the other side of the disc rotor are integrated with a bridge portion straddling the outside of the disc rotor. The caliper body coupled to the caliper bracket fixed to the vehicle body at one side of the disc rotor is slidably supported in the disc axial direction via a pair of slide pins, and the action portion and the reaction portion A pair of friction pads are opposed to each other with the disk rotor interposed therebetween, and a torque receiving portion for supporting a braking torque from the friction pads is provided on the caliper bracket. Such a vehicle disc brake is fixed to the vehicle body by forming a mounting bolt mounting hole in the vehicle body mounting portion provided in the caliper bracket, and fastening the caliper bracket to the vehicle body with the mounting bolt mounted in the mounting bolt mounting hole. Is done.

The caliper bracket is provided with a torque receiving surface that supports braking torque from the friction pad on both sides in the circumferential direction of the disk, and a torque transmitting portion formed on the friction pad is in contact with the torque receiving surface. The caliper body receives the braking torque from the friction pad (for example, Patent Document 1).
JP 2004-28304 A

  In the above, the vehicle body mounting portion located on the disk delivery side when the vehicle advances in the caliper bracket is provided in the vicinity of the torque receiving portion, whereas the mounting bolt is mounted in the vicinity of the torque receiving portion. The vehicle body attachment part on the disk entry side when the vehicle moves forward is provided on the inner periphery side of the disk from the torque receiving part, and the attachment bolt is mounted at a position away from the torque receiving part. For this reason, the caliper bracket during braking receives a load in the direction of tilting or twisting with respect to the disk axis direction, thus deteriorating brake feeling, friction pad uneven wear, and friction pad dragging. There was a possibility of generating. Therefore, it is necessary to improve the mounting strength of the caliper bracket to the vehicle body, and to suppress tilting and twisting in the disk axis direction. However, since the caliper bracket must be formed thick, the caliper bracket is increased in weight and size. Cause the manufacturing cost to increase.

  Therefore, the present invention can effectively suppress the caliper bracket from tilting and twisting in the disk axial direction during braking while suppressing an increase in weight and size of the caliper bracket, improving the brake feeling and improving the friction pad bias. It aims at providing the disc brake for vehicles which can control wear and dragging.

In order to achieve the above object, the present invention provides an action part having a cylinder hole disposed on one side of the disk rotor and a reaction part disposed on the other side of the disk rotor. A caliper body that is integrally connected by a bridge section that spans the outside can be slid in the disk rotor axial direction via a slide pin to a caliper bracket that is fixed to the vehicle body by a pair of mounting bolts on one side of the disk rotor. The caliper bracket includes a bracket main body and the bracket main body from the bracket main body to the outer side of the disk rotor , wherein the caliper bracket is disposed between the action portion and the reaction portion. A pair of caliper support arms projecting in the disk axial direction across the disk, and the pair of caliper support arms on the piston side A torque receiving surface for supporting the braking torque from the friction pad is provided on the surface, and a vehicle body mounting portion is provided at a portion of the pair of caliper support arms that protrudes in the disk axial direction across the outer side of the disk rotor. A mounting bolt mounting hole is formed in each vehicle body mounting portion across the outer side of the disk rotor, and the pair of mounting bolt mounting holes formed in the pair of caliper support arms and the cylinder provided in the action portion The hole is within a range sandwiched between a first base line connecting the disk radial outer ends of the opposing torque receiving surfaces and a second base line connecting the disk radial inner ends of the opposing torque receiving surfaces. The center of the mounting bolt mounting hole and the center of the cylinder hole are respectively positioned.

  The torque receiving surface may be formed in parallel to a third base line that passes through the center of the cylinder hole and is orthogonal to the disk axis, and the first base line and the second base line are It may be perpendicular to the third baseline passing through the center and perpendicular to the disk axis.

  By forming as described above, the braking torque received by the torque receiving surface of the caliper bracket can be directly received by the mounting bolt attached in the vicinity of the torque receiving surface. In addition, since a pair of mounting bolts are arranged on both sides of the cylinder center on a substantially straight line, the caliper bracket can be mounted on the vehicle body in a well-balanced manner with these mounting bolts, and the caliper bracket disc axis direction generated during braking Can be effectively suppressed. Along with this, the brake feeling can be improved, and the uneven wear and drag of the friction pad can be suppressed. Furthermore, since the mounting bolt can have an effect as a reinforcing material, it is possible to improve the mounting strength of the caliper bracket to the vehicle body while suppressing an increase in the weight and size of the caliper bracket.

  Hereinafter, an embodiment of the present invention will be described in detail with reference to the drawings. 1 to 6 show a first embodiment of a vehicle disc brake according to the present invention. FIG. 1 is a front view of a caliper bracket, FIG. 2 is a front view of the disc brake, and FIG. FIG. 4 is a sectional view taken along line IV-IV in FIG. 3, FIG. 5 is a rear view of the disc brake, and FIG. 6 is a partial sectional plan view of the disc brake. An arrow A in the figure indicates the rotational direction of the disc rotor during forward traveling of the vehicle, and the disc brake turning-in side and the outlet side used in the following description are for forward traveling of the vehicle.

  In the disc brake 1, a caliper bracket 3 is fixed to the vehicle body on one side of the disc rotor 2, and a caliper body 6 is supported on the caliper bracket 3 through slide pins 4 and 5 so as to be movable in the disc axial direction. A pair of friction pads 7, 7 are disposed opposite to each other across the disk rotor 2 between the action portion 6 a and the reaction portion 6 b of the caliper body 6.

  The caliper bracket 3 includes a bracket main body 3a and a pair of caliper support arms 3b and 3b protruding from the bracket main body 3a across the outside of the disk rotor 2 in the disk axial direction. The bracket body 3a is substantially U-shaped when viewed from the front, has a housing recess 3c for the friction pads 7 and 7 at the center, and the caliper support arms 3b and 3b project from both sides in the circumferential direction of the disk.

  The caliper support arms 3b and 3b are formed in a straight line having a length extending from the reaction portion 6b side to the action portion 6a. Inside the caliper support arm 3b on the disk insertion side, a bag-like pin insertion hole 3d is formed. Is provided in the caliper support arm 3b on the disk delivery side, and a female screw hole 3e is provided in the caliper support arm 3b. U-shaped torque receiving portions 3f and 3f for supporting the braking torque from the friction pads 7 and 7 are formed opposite to each other on the piston-side facing surfaces of the caliper support arms 3b and 3b. These torque receiving portions 3f , 3f, torque receiving surfaces 3g, 3g are formed at the opposite innermost part in the disk rotation direction.

  The caliper support arms 3b and 3b located on the anti-friction pad side of the torque receiving portions 3f and 3f are provided with a pair of vehicle body mounting portions 3h and 3h adjacent to the torque receiving portions 3f and 3f. In 3h and 3h, mounting bolt mounting holes 3i and 3i for mounting mounting bolts are formed. The caliper bracket 3 is fixed to the vehicle body by screwing mounting bolts (not shown) inserted from the vehicle body side into the mounting bolt mounting holes 3i, 3i.

  The caliper body 6 includes the above-described action part 6 a and reaction part 6 b that are arranged opposite to both sides of the disk rotor 2, and a bridge part 6 c that bridges the outside of the disk rotor 2 and connects them. A cylinder hole 6d is provided in the center of the action portion 6a so as to open to the disk rotor 2 side. A piston 8 is accommodated in the cylinder hole 6d, and between the piston 8 and the bottom wall of the cylinder hole 6d. A hydraulic chamber 9 is defined.

  The cylinder hole 6d, the torque receiving surfaces 3g and 3g, and the mounting bolt mounting holes 3i and 3i are torques at which the centers C1 and C1 of the mounting bolt mounting holes 3i and 3i and the center C2 of the cylinder hole 6d face each other. Arranged within a range sandwiched between the first base line L1 connecting the outer radial ends of the receiving surfaces 3g, 3g and the second base line L2 connecting the inner radial ends of the opposing torque receiving surfaces 3g, 3g. Has been. The torque receiving surfaces 3g and 3g are formed in parallel to the third base line L3 passing through the center C2 of the cylinder hole 6d and orthogonal to the disk axis A1, and the first base line L1 and the second base line L2 are: It is formed to be orthogonal to the third base line L3.

  Bracket mounting arms 6e and 6e are projected along one side surface of the disk rotor 2 on the disk rotor inlet side and outlet side of the acting portion 6a, and the tip of the bracket inlet arm 6e on the disk inlet side. One slide pin 4 is projected in parallel with the disk axis A1 by a fixing bolt 10, and the other slide pin 5 is inserted through the collar 11 into the bracket mounting arm 6e on the disk delivery side. ing. The disk lead-in side slide pin 4 is inserted into the pin insertion hole 3d of the caliper support arm 3b, and the disk feed-out side slide pin 5 is screwed into the female screw hole 3e of the caliper support arm 3b via the collar 11. The caliper body 6 is guided to move in the disk axial direction by attaching the slide pins 4 and 5.

  Each friction pad 7 includes a lining 7a that is in sliding contact with the side surface of the disk rotor 2, and a metal back plate 7b that holds the lining 7a. The back plate 7b is provided with torque transmitting portions 7c and 7c protruding in the direction of turning in and out of the disc, and the torque transmitting portions 7c and 7c are supported by the torque receiving portions 3f and 3f via retainers 12 and 12, respectively. Has been.

  This embodiment is configured as described above, and when the hydraulic fluid is supplied to the hydraulic pressure chamber 9 of the caliper body 6 by the driver's braking operation, the piston 8 moves the cylinder hole 6d toward the opening. The friction pad 7 on the acting portion 6 a side is pushed forward, and the lining 7 a of the friction pad 7 is pressed against one side of the disk rotor 2. Next, due to this reaction, the caliper body 6 moves in the direction of the action part 6a by the guide of the slide pins 4 and 5, the reaction force claw 6f of the reaction part 6b pushes the friction pad 7 on the reaction part 6b side, A braking action is performed by pressing the lining 7a of the friction pad 7 against the other side of the disk rotor 2.

  At this time, the vehicle body mounting portions 3h, 3h are disposed in the vicinity of the torque receiving portions 3f, 3f, and the center C1 of the mounting bolt mounting hole 3i is located between the first base line L1 and the second base line L2. Therefore, the braking torque received by the torque receiving surfaces 3g and 3g of the torque receiving portions 3f and 3f can be directly received by the mounting bolts disposed in the vicinity of the torque receiving surfaces 3g and 3g. Further, by forming the torque receiving surface 3g parallel to the third base line L3, and further forming the first base line L1 and the second base line L2 so as to be orthogonal to the third base line L3, the torque The braking torque received by the receiving surface 3g can be transmitted to the mounting bolts more linearly.

  Further, since a pair of mounting bolts are disposed on both sides of the center C2 of the cylinder hole 6d in a substantially straight line, the caliper bracket 3 can be mounted on the vehicle body with a good balance by these mounting bolts, and the caliper generated during braking The tilting and twisting of the bracket 3 in the disk axial direction can be effectively suppressed. Accordingly, the brake feeling can be improved, and the friction pads 7 and 7 can be prevented from being unevenly worn, and the friction pads 7 and 7 can be prevented from being dragged. . Furthermore, since the mounting bolt can be provided with an effect as a reinforcing material, the mounting strength of the caliper bracket 3 to the vehicle body can be improved while suppressing an increase in weight and size of the caliper bracket 3.

It is a front view of the caliper bracket which shows one example of this invention. It is a front view of a disk brake similarly. It is III-III sectional drawing of FIG. It is IV-IV sectional drawing of FIG. It is a rear view of a disk brake similarly. 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 ... Bracket main body, 3b ... Caliper support arm, 3c ... Housing recessed part, 3d ... Pin insertion hole, 3e ... Female screw hole, 3f ... Torque receiving part, 3g ... Torque receiving surface, 3h ... body mounting portion, 3i ... mounting bolt mounting hole, 4,5 ... slide pin, 6 ... caliper body, 6a ... action portion, 6b ... reaction portion, 6c ... bridge portion, 6d ... cylinder hole, 6e ... bracket mounting arm, 6f ... reaction force claw, 7 ... friction pad, 7a ... lining, 7b ... back plate, 8 ... piston, 9 ... hydraulic chamber, 10 ... fixing bolt, 11 ... collar, 12 ... retainer, A1 ... Disc shaft, C1... Center of mounting bolt mounting hole, C2... Center of cylinder hole, L1... First baseline, L2.

Claims (3)

A caliper in which an action part having a cylinder hole arranged on one side of the disk rotor and a reaction part arranged on the other side of the disk rotor are integrally connected by a bridge part straddling the outside of the disk rotor. A body is supported by a caliper bracket fixed to the vehicle body by a pair of mounting bolts at one side of the disk rotor so as to be slidable in the axial direction of the disk rotor via the slide pin, and the action portion and the reaction portion In the vehicle disc brake in which a pair of friction pads are opposed to each other with the disc rotor interposed therebetween, the caliper bracket is a pair of brackets protruding from the bracket body and the outside of the disc rotor in the disc axial direction. A caliper support arm, and a braking torque from a friction pad on the piston side facing surface of the pair of caliper support arms. A torque receiving surface to be supported is provided opposite to each other, and a vehicle body attachment portion is provided at a portion of the pair of caliper support arms that protrudes in the disk axial direction across the outside of the disk rotor, and each disk attachment portion is provided with the disk rotor. A mounting bolt mounting hole is formed across the outside of the pair , and the pair of mounting bolt mounting holes formed in the pair of caliper support arms and the cylinder hole provided in the action portion are formed on the opposing torque receiving surface. The center of the mounting bolt mounting hole and the cylinder hole are within a range sandwiched between a first base line connecting the outer ends in the disk radial direction and a second base line connecting the inner ends in the disk radial direction of the opposing torque receiving surfaces. The disc brake for vehicles characterized by positioning the center of each. 2. The vehicle disc brake according to claim 1, wherein the torque receiving surface is formed in parallel to a third base line passing through the center of the cylinder hole and orthogonal to the disc axis. 2. The vehicle disc brake according to claim 1, wherein the first base line and the second base line are orthogonal to a third base line that passes through the center of the cylinder hole and is orthogonal to the disk axis.

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