JP2015048886A - Disc drake - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a disc brake capable of suppressing occurrence of brake noise (so-called fine pressure noise) especially at the time of slow braking.SOLUTION: A disc brake includes a friction pad 13 that is oscillatably supported to a carrier 12 on both surfaces of a disc 11 and is pressed against the disc 11 by a caliper; and has a friction material in which the friction pad 13 contacts with the disc 11, and a back plate 62 to which the friction material is pasted and that is supported to a support part 35 of the carrier 12 by a fitting part 65 having a curved surface shape. The fitting part 65 is formed by a curved surface continuing in a view from a disc axial direction, and is supported to the support part 35 at two places of a disc radial outside and a disc radial inside.

Description

  The present invention relates to a disc brake.

  In some disc brakes, the friction pad is fitted to the carrier so that the fitting portion is a curved surface when viewed from the disc axial direction (see, for example, Patent Document 1).

JP 2012-167739 A

  In the disc brake, the vibration generated in the friction pad is suppressed by restraining with the friction force generated by the friction pad and the carrier. That is, at the time of braking, the pad is pressed against the carrier in the disk rotation direction by the frictional force with the disk, and this pressing force generates a frictional force between the pad and the carrier. The pad is restrained by the carrier by this frictional force, and the occurrence of vibration in the direction of the disc contact surface of the pad is suppressed. For this reason, at the time of slow braking, the frictional force between the pad and the disk is small and the pressing force of the pad against the carrier is weakened, the frictional force between the carrier and the pad is small, and the support tends to become unstable. For this reason, vibrations in the direction of the disk contact surface are likely to occur in the pad, and there is a possibility that brake noise will occur due to this vibration.

  Therefore, an object of the present invention is to provide a disc brake that can suppress the occurrence of brake squeal (so-called low pressure squeal) particularly during slow braking.

  In order to achieve the above object, according to the present invention, the fitting portion of the friction pad is formed by a curved surface that is continuous when viewed from the disc axial direction, and the carrier support portion has a disc radial outer side and a disc radial inner side. And supported in two places.

  According to the disc brake of the present invention, it is possible to suppress the occurrence of brake squeal during slow braking.

It is a front view showing a disc brake concerning one embodiment of the present invention. It is the top view which fractured | ruptured a part which shows the disc brake which concerns on one Embodiment of this invention. It is a front view of the state where the caliper which shows the disc brake concerning one embodiment of the present invention was removed. FIG. 3 is a front view showing a support structure portion on the outer side and the disc delivery side of the disc brake according to the embodiment of the present invention. It is a front view showing a friction pad of a disc brake concerning one embodiment of the present invention. It is a rear view which shows the friction pad of the disc brake which concerns on one Embodiment of this invention.

  A disc brake according to an embodiment of the present invention will be described below with reference to the drawings.

  The disc brake 10 of the present embodiment shown in FIGS. 1 and 2 is for a vehicle, specifically for a four-wheeled vehicle, and brakes the vehicle by braking a disc 11 that rotates with a wheel (not shown). Is. Of course, the present invention can also be applied to other vehicles such as motorcycles. In the following, the radial direction of the disk 11, in particular, the line passing through the rotation center of the disk brake 10 and the rotation center of the disk 11 will be referred to as the disk radial direction, and the axial direction of the disk 11 will be referred to as the disk axial direction. 11 is referred to as a disk rotation direction.

  The disc brake 10 is slidable in the disc axial direction with respect to the carrier 12, the pair of friction pads 13 and 13 shown in FIG. 2 supported so as to be slidable in the disc axial direction with the carrier 12. And a caliper 14 to be supported.

  The carrier 12 is disposed so as to straddle the outer diameter side of the disk 11 and is fixed to a non-rotating portion of the vehicle. The pair of friction pads 13 and 13 are supported by the carrier 12 on both sides of the disk rotation direction in a state of being opposed to both surfaces of the disk 11. That is, the pair of friction pads 13 and 13 are slidably supported by the carrier 12 on both sides of the disk 11.

  The caliper 14 is supported by the carrier 12 so as to be slidable in the disk axial direction while straddling the outer diameter side of the disk 11, and the pair of friction pads 13, 13 are pressed against the disk 11 to press the disk 11. Applying frictional resistance and braking.

  The carrier 12 has a mounting base portion 20 disposed so as to face the inner side (vehicle width direction inner side) surface of the disk 11 and the outer side (vehicle width direction outer side) surface of the disk 11. And a pair of connecting portions 22, 22 that connect the mounting base portion 20 and the outer beam portion 21 at both ends in the disc rotation direction beyond the radially outer side of the disc 11. Have.

  As shown in FIG. 1, the inner mounting base portion 20 extends along the disc rotation direction, and extends outward in the disc radial direction from both ends of the base body portion 25 in the disc rotation direction. And a pair of extending portions 26, 26. The ends of the pair of extending portions 26, 26 opposite to the base body portion 25 are connected to the connecting portions 22, 22 shown in FIG. As shown in FIG. 1, mounting holes 27 are formed in the mounting base portion 20 at two locations on both ends of the base main body portion 25 in the disk rotation direction. The carrier 12 is fixed to the non-rotating portion of the vehicle by a fastener inserted through the mounting holes 27 and 27.

  The outer beam portion 21 on the outer side includes a beam main body portion 30 extending along the disk rotation direction, and a pair of extending portions 31 extending outward in the disk radial direction from both ends of the beam main body portion 30 in the disk rotation direction. 31. The ends of the pair of extending portions 31, 31 opposite to the beam main body 30 are connected to the connecting portions 22, 22 shown in FIG.

  As shown in FIG. 3, the pair of extending portions 31, 31 of the outer beam portion 21 are a pair of support portions 35, 35 that support one outer friction pad 13 on the opposite sides. . The pair of extending portions 26, 26 of the mounting base portion 20 are also a pair of similar support portions that support one inner friction pad 13 on the opposite sides, although not shown. As shown in FIG. 3, the pair of support portions 35, 35 of the outer beam portion 21 have a mirror-symmetric shape. In addition, a pair of support portions (not shown) of the mounting base portion 20 have a mirror-symmetric shape.

  Since the pair of support portions 35, 35 of the outer beam portion 21 and the pair of support portions (not shown) of the mounting base portion 20 all have the same shape, the support portion 35 at one place will be described with reference to FIG. To do. FIG. 4 shows a support portion 35 on the outlet side of the outer beam portion 21 in the disc rotation direction.

  The support portion 35 is a curved support concave surface 37 that is recessed along the disk rotation direction, and a center line that is on the outer side of the support concave surface 37 in the disk radial direction and passes through the center position of the carrier 12 in the disk rotation direction. (Hereinafter referred to as the carrier center line) and a flat surface 38 parallel to the carrier center line, which is on the inner side of the support concave surface 37 in the disk radial direction. The concave support surface 37, the flat surface 38, and the flat surface 39 are along the disk axial direction.

  The support concave surface 37 is a support curved surface portion 40 having a center of curvature on the opposite side of the concave direction of the support concave surface 37 and having a predetermined radius of curvature at the intermediate portion in the disk radial direction. Further, the support concave surface 37 is a flat surface portion 41 that extends in the tangential direction from the end portion of the support curved surface portion 40 in the disk radial direction outside the support curved surface portion 40 in the disk radial direction. Further, in the support concave surface 37, the inner portion in the disk radial direction of the support curved surface portion 40 is a flat surface portion 42 extending in the tangential direction from the end portion of the support curved surface portion 40 in the disk radial direction. The flat surface portion 41 is inclined with respect to the carrier center line so as to be closer to the carrier center line as it is away from the support curved surface portion 40, and the flat surface portion 42 is also closer to the carrier center line as it is away from the support curved surface portion 40. Inclined with respect to the line. The flat surface portions 41 and 42 have an acute angle with each other.

  The pair of support portions 35, 35 of the outer beam portion 21 and the pair of support portions (not shown) of the mounting base portion 20 shown in FIG. 3 are shared by two places on the same side in the disc rotation direction and aligned in the disc axial direction. The pad guides 45, 45 which are two common parts in total are arranged. The pad guide 45 is formed by pressing a plate member having a constant thickness.

  One pad guide 45 includes a curved guide plate portion 46 that covers the support concave surface 37 of the support portion 35 on the one side in the disk rotation direction of the outer beam portion 21, and a mounting base portion on the same side as the support portion 35 in the disk rotation direction. 20 includes a guide plate portion (not shown) that covers the support concave surface of the support portion (not shown), and a connecting plate portion 47 that connects these guide plate portions. The other pad guide 45 also shows a guide plate portion 46 that covers the support concave surface 37 of the support portion 35 on the other side of the outer beam portion 21 in the disc rotation direction, and the mounting base portion 20 on the same side as the support portion 35 in the disc rotation direction. A guide plate portion (not shown) that covers the support concave surface of the substantially support portion and a connecting plate portion 47 that connects them are provided.

  Since the guide plate portion 46 and the guide plate portion (not shown) of one pad guide 45 and the guide plate portion 46 and the guide plate portion (not shown) of the other pad guide 45 all have the same shape, FIG. One guide plate portion 46 will be described with reference to FIG. 4 shows a guide plate portion 46 that covers the support concave surface 37 of the support portion 35 of the outer beam portion 21 on the exit side in the disk rotation direction.

  The guide plate portion 46 is a curved plate portion 50 having an intermediate portion in the disk radial direction formed with a radius of curvature equivalent to that of the support curved surface portion 40 of the support concave surface 37. In addition, the guide plate portion 46 is a flat plate portion 51 whose outer portion in the disc radial direction than the curved plate portion 50 extends in the tangential direction from the outer end portion of the curved plate portion 50 in the disc radial direction. The flat plate portion 51 is connected to the connecting plate portion 47. Further, the guide plate portion 46 is a flat plate portion 52 whose inner portion in the disk radial direction than the curved plate portion 50 extends in the tangential direction from the inner end portion of the curved plate portion 50 in the disk radial direction. In the guide plate portion 46, the curved plate portion 50 comes into contact with the entire support curved surface portion 40 of the support concave surface 37, and at the same time, the flat plate portion 51 comes into surface contact with the flat surface portion 41 of the support concave surface 37, The flat plate portion 52 comes into surface contact with the flat surface portion 42 of the support concave surface 37. Therefore, the curved plate portion 50 of the guide plate portion 46 abuts against the support curved surface portion 40 without a gap. The guide plate portion 46 is in contact with the support concave surface 37 and is along the disk axial direction. Further, the guide plate portion 46 has a spring plate portion 53 extending from the opposite side of the flat plate portion 52 to the curved plate portion 50 in the same direction as the flat plate portion 52.

  As shown in FIG. 5, the friction pad 13 includes a friction material 60 and a back plate 62 shown in FIGS. 5 and 6 to which the friction material 60 is attached on one side in the thickness direction. As shown in FIG. 3, the friction pad 13 is such that the back plate 62 is slidably supported by the carrier 12 via a pair of pad guides 45, 45, and the friction material 60 fixed to the back plate 62. Comes into contact with the disk 11 during braking. The friction pad 13 is supported by the carrier 12 as shown in FIG. 3, and the pad center line passing through the center position in the disk rotation direction and extending along the disk radial direction coincides with the carrier center line when viewed from the disk axial direction. .

  As shown in FIG. 5, the back plate 62 is formed to be slightly larger than the friction material 60, and has a pair of curved fitting portions that protrude outwardly in the disc rotation direction on both sides of the disc rotation direction. 65, 65 are formed. As shown in FIG. 3, in the friction pad 13, the pair of fitting portions 65 and 65 are fitted to the guide plate portions 46 and 46 of the pad guides 45 and 45 described above.

  The fitting parts 65 and 65 have the same shape and are formed in mirror symmetry. For this reason, the one fitting part 65 is demonstrated, referring FIG. FIG. 4 shows a fitting portion 65 supported by the support portion 35 on the disc rotation direction outlet side of the outer beam portion 21. The fitting portion 65 has a fitting convex surface 66 that fits to the support concave surface 37 of the carrier 12 via the guide plate portion 46 of the pad guide 45. The fitting portion 65 is supported by being nested with the support portion 35 of the carrier 12, and the fitting convex surface 66 abuts against the guide plate portion 46 of the pad guide 45 at that time. The braking torque generated in the friction pad 13 by coming into contact with the rotating disk 11 is received by the support portion 35 of the carrier 12 via the guide plate portion 46 of the pad guide 45 that contacts the fitting portion 65. Therefore, the support concave surface 37 of the support portion 35 of the carrier 12 becomes a torque receiving surface.

  The fitting convex surface 66 has an intermediate portion in the disk radial direction as a fitting curved surface portion 70 having a center of curvature on the side opposite to the protruding direction of the fitting portion 65 and having a predetermined radius of curvature. . The fitting curved surface portion 70 is formed by a curved surface that is continuous when viewed from the disk axial direction. Further, the fitting convex surface 66 is a flat surface portion 71 that extends in the tangential direction from the outer end portion of the fitting curved surface portion 70 in the disk radial direction of the fitting curved surface portion 70 in the disk radial direction. Further, the fitting convex surface 66 has a flat surface portion 72 extending in the tangential direction from the inner end portion of the fitting curved surface portion 70 in the disk radial direction with respect to the fitting curved surface portion 70 in the disk radial direction. The flat surface portion 71 is inclined with respect to the carrier center line so as to be closer to the carrier center line as it is away from the fitting curved surface portion 70, and the flat surface portion 72 is also closer to the carrier center line as it is away from the fitting curved surface portion 70. Inclined with respect to the line.

  Here, the fitting curved surface portion 70 of the fitting convex surface 66 of the fitting portion 65 is formed with a curvature radius smaller than the curvature radius of the support curved surface portion 40 of the support concave surface 37 of the support portion 35. It is formed with a radius of curvature smaller than the radius of curvature of the curved plate portion 50. Further, the angle formed by the flat surface portions 71 and 72 of the fitting portion 65 is smaller than the angle formed by the flat surface portions 41 and 42 of the support concave surface 37 of the support portion 35, and the angle formed by the flat plate portions 51 and 52 of the pad guide 45. Is smaller than Thereby, the fitting portion 65 has a position on the outer side in the disc radial direction and a position on the inner side in the disc radial direction from the position where the fitting curved surface portion 70 of the fitting convex surface 66 is farthest from the carrier center line of one guide plate portion 46. It will be in contact with the two places by line contact.

  Therefore, one fitting portion 65 is linearly supported by a single support portion 35 and is located on the outer side in the disk radial direction of the support portion 35 in the disk rotation direction and extends in the disk axial direction. And a linear support position P2 extending in the disk axial direction and inward of the disk radial direction from the position P0. Moreover, the two points of the support position P1 and the support position P2 support one fitting portion 65 at the same time. That is, the support part 35 restrains the fitting convex surface 66 of the fitting part 65 in the out-of-plane direction. The fitting curved surface portion 70 of the fitting convex surface 66 of the fitting portion 65 is in contact with the pad guide 45 at two positions, and the fitting curved surface portion 70 of the fitting portion 65 and the pad guide 45 are between them. A gap is formed. The spring plate portion 53 of the pad guide 45 abuts against the flat surface portion 72 in the disc radial direction inside of the fitting convex surface 66 of the fitting portion 65 and presses the friction pad 13 outward in the disc radial direction.

  As shown in FIG. 2, the caliper 14 includes a caliper body 80 that is supported by the carrier 12 so as to be slidable in the disk axial direction while straddling the disk 11, and a caliper body that faces one surface of the disk 11. 1 has a piston 81 shown in FIG. 1 that is slidably supported by 80, and a claw portion 82 that is formed integrally with the caliper body 80 so as to face the other surface of the disk 11. As shown in FIG. 2, the caliper body 80 has a pair of sliding pins 83 attached to both end positions in the disk rotation direction, and these sliding pins 83 are formed at the position of the connecting portion 22 of the carrier 12. A pin hole (not shown) is slidably fitted. Thereby, the caliper 14 is supported by the carrier 12. The caliper 14 sandwiches the friction pads 13 and 13 on both sides between the piston 81 and the claw portion 82 that move forward by the brake fluid pressure, and presses the disc 11 toward the disc 11. As a result, the friction pads 13 and 13 on both sides slide in the axial direction of the disk with respect to the pad guides 45 and 45 and the carrier 12 that support the friction pads 13 and 13 to contact the disk 11 to generate a frictional resistance and to apply a braking force. generate.

  According to the disc brake 10 of the present embodiment described above, the curved fitting portion 65 formed by a continuous curved surface when viewed from the disc axial direction of the friction pad 13 is provided on the support portion 35 of the carrier 12 with the disc. Since it is supported at two places, the support position P1 on the radially outer side and the support position P2 on the inner side in the radial direction of the disk, even if the pressing force of the friction pad 13 against the carrier 12 is weak during slow braking, the carrier 12 The restraint of the friction pad 13 is more stable than the restraint with the frictional force. Therefore, the friction pad 13 is constrained particularly in the radial direction of the disk, and a support structure in which vibrations in the radial direction of the disk are not easily generated is obtained. Therefore, it is possible to suppress the occurrence of brake squeal (so-called low pressure squeal) during slow braking.

  Further, since the fitting portion 65 is formed with a radius of curvature smaller than the radius of curvature of the support portion 35, the support portion 35 has the fitting portion 65 in two places even if the angle of the friction pad 13 is slightly changed. Can be supported.

  Further, since the carrier 12 supports one fitting portion 65 of the friction pad 13 at two support positions P1 and P2 extending along the disk axial direction, it is a vibration sound of the friction pad 13 due to an impact load. It can also suppress rattle sounds, cronks, and so on.

  Further, since the support concave surfaces 37 and 37 of the support portions 35 and 35 of the carrier 12 are along the disk axis direction, the support concave surfaces 37 and 37 can be processed with a tool that rotates around a rotation axis along the disk axis direction. Therefore, productivity can be improved.

  The embodiment described above includes a friction pad that is slidably supported by a carrier on both sides of a disk and pressed against the disk by a caliper, and the friction pad is in contact with the disk, and the friction material is affixed. A disc brake having a back plate supported by a support portion of the carrier by a curved fitting portion, wherein the fitting portion is formed by a continuous curved surface when viewed from the disc axial direction, and the support portion The disk is supported at two locations, the outer side in the disk radial direction and the inner side in the disk radial direction. Thereby, it becomes a support structure which is hard to produce a vibration to a friction pad, and generation | occurrence | production of the brake squeal (what is called a slight pressure squeal) especially at the time of slow braking can be suppressed.

  Moreover, the said fitting part is formed with the curvature radius smaller than the curvature radius of the said support part. Thereby, two places of the fitting part by a support part can be supported stably.

DESCRIPTION OF SYMBOLS 10 Disc brake 11 Disc 12 Carrier 13 Friction pad 14 Caliper 35 Support part 60 Friction material 62 Back plate 65 Fitting part P1, P2 Support position

Claims (2)

A friction pad that is slidably supported by the carrier on both sides of the disk and is pressed against the disk by a caliper, and a friction material with which the friction pad abuts the disk, and a frictional material attached to the friction pad In a disc brake having a back plate supported by a support portion of the carrier by a portion,
The fitting portion is formed by a curved surface that is continuous when viewed from the disc axial direction, and is supported by the support portion at two locations, the outer side in the disc radial direction and the inner side in the disc radial direction. .   The disc brake according to claim 1, wherein the fitting portion is formed with a curvature radius smaller than a curvature radius of the support portion.

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