JP4461082B2 - Caliper body for disc brakes for vehicles - Google Patents

Description

  The present invention relates to a caliper body of a vehicle disc brake used for a traveling vehicle such as an automobile or a motorcycle, and more specifically, a pair of caliper halves arranged opposite to both sides of a disc rotor is composed of at least three connecting bolts. The present invention relates to a split caliper body formed by connecting.

A pair of caliper halves facing each other on both sides of the disk rotor are joined together at the bridge portion and connected by a plurality of connecting bolts to form a caliper body, and a plurality of cylinder holes are opposed to both caliper halves. With a caliper body with a piston inserted in each of the cylinder holes, the braking reaction force in the anti-disk rotor direction from each piston acts during braking so that the caliper body opens in a C shape with the bridge as a fulcrum. Was. In order to prevent the caliper body from being deformed by this action, there is one in which the number of connecting bolts is increased to ensure the connection strength of the caliper halves of the caliper body (see, for example, Patent Document 1).
JP 2001-271856 A

  However, in the above-described device, the number of parts is increased and the cost is increased, and the caliper body is increased in size and weight.

  SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a caliper body for a vehicle disc brake capable of ensuring the connection strength of the caliper halves and preventing the caliper body from being deformed while reducing the size and weight of the caliper body. .

In order to achieve the above object, according to the first aspect of the present invention, a pair of caliper halves each formed with a cylinder hole facing each other on the disk entry side and the disk delivery side when the vehicle moves forward are arranged opposite to both sides of the disk rotor. In addition, one friction pad is provided on the front surface of each piston inserted in each cylinder hole, and a first connecting bolt is provided on the joint surface at the center in the disk circumferential direction of both caliper halves. Of the joint surfaces on both sides, the second connection bolt is inserted into the joint surface on the disk entry side when the vehicle moves forward, and the third connection bolt is inserted into the joint surface on the disk delivery side when the vehicle moves forward, respectively. and concluded, the by the movement of the opening-direction of each piston, each friction pad to the caliper body of a vehicular disk brake which sliding contact with the disc rotor There are, each friction pad has an outer shape of line symmetry with respect to the radial direction of the disk pad center line, when the vehicle moves forward, the center of each piston, offset to side out disk rotation with respect to the pad center line is, first the length of the radial direction of the disk from the bolt center of the first connecting bolt to the outer end portion of the joint surface of the disk circumferential direction central portion (L1), the disk rotation from the bolt center of the second connecting bolt entry side The second length (L2) in the disk radial direction to the outer end of the joining surface to be the disk, and the disk radial direction from the bolt center of the third connecting bolt to the outer end of the joining surface on the disk delivery side third longer form than any length of (L3) of, and, as a characteristic that there was feature that the second lengths (L2) is formed longer than the third length (L3) Yes.

  In the second invention, in addition to the features of the first invention, the joint surface at the center portion in the circumferential direction of the disk has a fourth length (L4) in the circumferential direction of the disk at the outer circumferential side end portion of the disk. It is characterized by being formed longer than the fifth length (L5) in the disk circumferential direction at the side end.

  The third invention is characterized in that, in addition to the characteristics of the second invention, the first length (L1) is longer than the fourth length (L4).

In the fourth aspect of the invention, in addition to the first to feature of the third aspect of the present invention, from the bolt center before Symbol first connecting bolt, until the disk rotation-in side end surface of the joint surface of the disk circumferential direction central portion 6 The length (L6) is longer than the seventh length (L7) from the bolt center of the first connecting bolt to the disk delivery side end surface of the joint surface in the central portion of the disk circumferential direction. Yes.

According to the first or fourth invention, the minimum required in the disk circumferential direction center portion of the caliper body that receives a reaction force of a plurality of pistons and applies a large load during braking, and both sides of the disk circumferential direction that receives the reaction force of one piston The caliper body can be reduced in size and weight while ensuring the ultimate rigidity. By offsetting the center of the piston to the disk delivery side from the pad center line, the surface pressure that increases on the disk entry side of the friction pad is lowered by pushing the piston and rotating the disk rotor, thereby suppressing uneven wear of the lining. In addition, the friction pad protrudes toward the disc insertion side, so even if the circumferential length of the junction surface on the disc introduction side or the junction surface at the center in the circumferential direction of the disc is shortened, the caliper body Sufficient rigidity can be ensured .

  According to the second and third inventions, the rigidity of the central portion of the caliper body in the disk circumferential direction can be effectively increased.

  Hereinafter, an embodiment of the present invention will be described in detail with reference to the drawings. 1 is a cross-sectional front view of a disc brake showing an embodiment of the present invention, FIG. 2 is a plan view of the disc brake, FIG. 3 is a front view of the disc brake, and FIG. 4 is a cross-sectional view taken along line IV-IV in FIG. An arrow A in the figure indicates the direction of rotation of the disc rotor during forward traveling of the vehicle, and the disc brake turn-in side and the outlet side used in the following description are assumed to be during forward travel of the vehicle.

  The disc brake 1 includes a disc rotor 2, a caliper body 3 that is attached to the vehicle body at one side of the disc rotor 2, and four friction plates disposed inside the caliper body 3 so as to face each other with the disc rotor 2 interposed therebetween. And a pad 4.

  The caliper body 3 abuts the first caliper half 3a disposed on one side of the disk rotor 2 and the second caliper half 3b disposed on the other side of the disk rotor 2 with a bridge portion 3c. The first connecting bolt 5 is connected to the joint surface 3d at the center in the circumferential direction, the second connecting bolt 6 is connected to the connecting surface 3e on the disk entry side, and the third connection bolt 7 is connected to the connection surface 3f on the disk delivery side. The caliper halves 3a and 3b are connected to each other and fastened, and are bolted to the vehicle body using a vehicle body mounting bracket 3g formed on the second caliper half 3b.

  Cylinder holes 3h are formed on the caliper inlet side and the disc outlet side of both caliper halves 3a and 3b so as to face each other, and pistons 8 are respectively inserted into the respective cylinder holes 3h. And a bottom wall of each cylinder hole 3h, a fluid pressure chamber 9 is defined, and each fluid pressure chamber 9 communicates with a fluid passage 3i. The front surface of each piston 8 is provided with one friction pad 4 corresponding to each.

  Each friction pad 4 includes a lining 4a and a metal back plate 4b, and has a line-symmetric outer shape with respect to a pad center line PC in the disk radial direction. In the lining 4a, a slit 4c parallel to the pad center line PC is formed on the disk introduction side, and the slit 4c is divided into a disk introduction side and a delivery side. Each friction pad 4 has its lining 4a directed toward the disk rotor 2, and can be moved in the disk axial direction by inserting a hanger pin 10 into the upper part of two back plates 4b facing each other with the disk rotor 2 in between. The center A1 of the piston is offset from the pad center line PC of each friction pad 4 and is offset to the disk delivery side.

  The first caliper half 3a and the second caliper half 3b are the first length in the disk radial direction from the bolt center P1 of the first connecting bolt 5 to the outer end of the joint surface 3d at the center in the disk circumferential direction. L1 is a second length L2 in the radial direction of the disk from the bolt center P2 of the second connection bolt 6 to the outer end of the joint surface 3e on the disk insertion side, and the bolt center P3 of the third connection bolt 7 It is formed longer than any of the third lengths L3 in the radial direction of the disk up to the outer end of the joining surface 3f on the exit side. Further, the joint surface 3d at the center portion in the disk circumferential direction is formed such that the disk circumferential direction fourth length L4 of the disk outer circumferential side end is longer than the fifth length L5 of the disk inner circumferential side end in the disk circumferential direction. In addition, the first length L1 is longer than the fourth length L4.

  Further, the second length L2 in the disk radial direction from the bolt center P2 of the second connection bolt 6 to the outer end portion of the joint surface 3e on the disk entry side is determined from the bolt center P3 of the third connection bolt 7. The first connecting bolt 5 is formed longer than the third length L3 in the disk radial direction to the outer end of the joint surface 3f on the side. Further, the first connecting bolt 5 is connected to the disk periphery from the bolt center P1 of the first connecting bolt 5. The sixth length L6 from the joint surface 3d at the center in the direction to the disk entry side end surface is longer than the seventh length L7 from the bolt center P1 to the disk delivery side end surface of the joint surface 3d. ing.

  In the disc brake 1 formed as described above, when the hydraulic fluid pressurized by the hydraulic master cylinder is supplied to each hydraulic chamber 9 through the fluid passage 3i by the driver's braking operation, each piston 8 is Moving toward the cylinder hole opening, the lining 4a of the friction pad 4 disposed on the front surface of each piston 8 is brought into sliding contact with the side surface of the disk rotor 2 to perform a braking operation.

  A braking reaction force in the anti-disk rotor direction is applied from each piston 8 to the first caliper half 3a and the second caliper half 3b at the time of braking, and the caliper body 3 has a square shape with the bridge portion 3c as a fulcrum. Try to transform to open. At this time, the length L1 in the disk radial direction from the bolt center P1 of the first connection bolt 5 to the outer end of the joint surface 3d at the disk circumferential center is set to the disk rotation from the bolt center P2 of the second connection bolt 6. The length L2 in the disk radial direction to the outer end of the joint surface 3e on the side and the length in the disk radial direction from the bolt center P3 of the third connecting bolt 7 to the outer end of the joint surface 3f on the disk delivery side Since it is formed longer than either length L3, the disk circumferential direction center portion of the caliper body 3 that receives the reaction force of the two pistons 8 and 8 and applies a large load during braking and the reaction of one piston 8 The caliper body 3 can be reduced in size and weight while ensuring the necessary minimum rigidity on both sides in the circumferential direction of the disk that receives the force. Furthermore, since the caliper body 3 has sufficient rigidity and is not deformed during braking, uneven wear of each friction pad 4 can be prevented.

  Further, the joint surface 3d at the center in the disk circumferential direction is formed such that the disk circumferential direction length L4 of the disk outer peripheral side end is longer than the disk circumferential direction length L5 of the disk inner peripheral side end. The length L1 in the disk radial direction from the bolt center P1 of the connecting bolt 5 to the outer end of the joint surface 3d at the center in the disk circumferential direction is longer than the length L4 in the disk circumferential direction at the disk outer peripheral side end. By forming, the rigidity of the central part of the caliper body in the circumferential direction of the three disks can be effectively increased.

  Further, the center A1 of each piston 8 is disposed offset to the disk delivery side with respect to the pad center line PC of each friction pad 4, and the slit 4c is formed on the disk delivery side of the lining 4a. By pressing the piston 8 and rotating the disk rotor 2, the surface pressure that increases on the disk insertion side of the friction pad 4 can be lowered, and uneven wear of the lining 4a can be suppressed. Further, along with this, even if the circumferential length of the joint surface 3e on the disk feed-in side and the joint surface 3d at the center in the disk circumferential direction becomes shorter, the bolt center P2 of the second connection bolt 6 on the disk feed-in side. To the outer end of the joining surface 3e in the disk radial direction, the second length L2 in the disk radial direction from the center P3 of the third connecting bolt 7 on the disk delivery side to the outer end of the joining surface 3f. It is formed longer than the third length L3, or a sixth length L6 from the bolt center P1 of the first connecting bolt 5 to the disk insertion side end surface of the joint surface 3d at the center in the disk circumferential direction is the center of the bolt. A sufficient rigidity of the caliper body 3 can be ensured by forming it longer than the seventh length L7 from P1 to the disk delivery side end surface of the joining surface 3d.

Note that the present invention is not limited to the above-described embodiment, and hydraulic operation is performed by two brake operation elements for the two hydraulic pressure chambers on the disk inlet side and the two hydraulic pressure chambers on the disk outlet side in the caliper body. it is as possible de also be applied to dual-type disk brake that.

  Furthermore, in the above-described embodiment, one connection bolt is inserted through each joint surface. However, the present invention is not limited to this, and a plurality of connection bolts are provided on each joint surface, particularly on the outer circumferential surface of the disk. In this case, the connection bolt closer to the center of the disk rotor is regarded as the second connection bolt or the third connection bolt, respectively.

It is a section front view of the disc brake which shows one example of the present invention. It is a top view of a disk brake similarly. It is a front view of a disk brake similarly. FIG. 4 is a sectional view taken along line IV-IV in FIG. 3.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... Disc brake, 2 ... Disc rotor, 3 ... Caliper body, 3a ... 1st caliper half body, 3b ... 2nd caliper half body, 3c ... Bridge part, 3d ... Joining surface of disk circumferential direction center part 3e ... Disc Joining surface on entry side, 3f ... Joining surface on disc delivery side, 3g ... Bracket, 3h ... Cylinder hole, 4 ... Friction pad, 4a ... Lining, 4b ... Back plate, 4c ... Slit, 5 ... First connecting bolt , 6 ... 2nd connecting bolt, 7 ... 3rd connecting bolt, 8 ... piston, 9 ... hydraulic chamber, 10 ... hanger pin, P1, P2, P3 ... bolt center, PC ... pad center line

Claims (4)

A pair of caliper halves with cylinder holes facing each other on the disk inlet side and disk outlet side when the vehicle moves forward are arranged opposite to both sides of the disk rotor, and are placed on the front surface of each piston inserted in each cylinder hole. One friction pad is provided in correspondence with each other, and the first connecting bolt is attached to the joint surface in the central portion of the disk circumferential direction of both caliper halves. The second connection bolt is inserted into the joint surface on the entry side, and the third connection bolt is inserted into the joint surface on the disk delivery side when the vehicle moves forward, respectively, and fastened in the disk axial direction. by movement in the direction, in caliper body of a vehicular disk brake which sliding contact with the friction pads to the disc rotor, wherein the friction pad, the disc radius It has an outer shape of line symmetry with respect to direction of the pad center line, when the vehicle moves forward, the center of each piston is offset to the side out disk rotation with respect to the pad center line, from the bolt center of the first connecting bolt The first length (L1) in the disk radial direction to the outer end portion of the joint surface in the central portion in the disk circumferential direction is set from the bolt center of the second connecting bolt to the outer end portion of the joint surface on the disk entry side. Any of the second length (L2) in the radial direction of the disk and the third length (L3) in the radial direction of the disk from the center of the third connecting bolt to the outer end of the joining surface on the disk delivery side A caliper body for a vehicle disc brake, wherein the caliper body is longer than the third length (L3) and the second length (L2) is longer than the third length (L3) . The joint surface at the center in the disk circumferential direction has a fourth length (L4) in the disk circumferential direction at the outer peripheral end of the disk that is greater than a fifth length (L5) in the disk circumferential direction at the inner peripheral end of the disk. The caliper body of the disc brake for a vehicle according to claim 1, wherein the caliper body is formed long. The caliper body of the vehicle disc brake according to claim 2, wherein the first length (L1) is longer than the fourth length (L4). A sixth length (L6) from the bolt center of the first connection bolt to the disk insertion side end surface of the joint surface in the center in the disk circumferential direction is determined from the bolt center of the first connection bolt to the disk circumferential direction. The caliper body for a vehicle disc brake according to any one of claims 1 to 3, wherein the caliper body is formed to be longer than a seventh length (L7) from the joining surface of the central portion to the end surface on the disk delivery side .

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