JP5468336B2 - Disc brake - Google Patents

Description

  The present invention relates to a disc brake that is suitably used for applying a braking force to a vehicle such as a two-wheeled vehicle or a four-wheeled vehicle.

  In general, a disc brake provided in a vehicle such as an automobile includes a caliper that is disposed across the outer periphery of the disc and presses a pair of friction pads toward both sides of the disc. The caliper is provided with a piston that presses the friction pad toward the surface of the disk by supplying hydraulic pressure from the outside. Further, a shim plate for preventing brake noise is provided on the back metal of the friction pad so as to be positioned between the caliper and the friction pad (see, for example, Patent Documents 1 and 2).

  In this type of conventional disc brake, when a vehicle driver or the like performs a brake operation, for example, a piston provided on the inner side of the caliper is slid to the disc side by supplying hydraulic pressure from the outside, thereby Press the friction pad against the disc. Then, the caliper slides and displaces with respect to the mounting member by the reaction force at this time, and presses the friction pads between the outer leg portion and the piston on both sides of the disc, thereby applying a braking force to the rotating disc. Is given.

  In addition, the shim plate attached to the back metal of the friction pad is interposed between the caliper and the friction pad, so that the rotational torque from the disc is prevented from being transmitted to the caliper through the friction pad during brake operation, and the brake squeal This reduces the occurrence of a phenomenon called "."

JP-A-9-53668 JP 2004-316899 A

  By the way, in the prior art of the above-mentioned patent document 1, the shim plate is locked to the claw portion on the piston side that is locked to the inner peripheral side of the piston and the back plate of the friction pad, and the shim plate is prevented from being removed from the back plate. And a pad-side claw portion to be held on the pad.

  However, the pawl portion on the pad side is configured to restrict the friction pad from moving in the circumferential direction of the disk with respect to the shim plate (piston), so that the friction pad will move in the circumferential direction of the disk during braking of the vehicle. In such a case, the posture of the friction pad may become unstable, and there is a problem that the occurrence of brake squealing cannot always be sufficiently reduced.

  On the other hand, in the prior art disclosed in Patent Document 2, an inner shim plate (pressed side shim plate) that is locked and attached to the back plate of the friction pad, and an outer shim plate (pressed side shim plate) that is locked and attached to the piston. The two shim plates are configured to contact each other so as to be slidable and displaceable.

  In this case, since the two shim plates are arranged so as to be slidable relative to each other, when the friction pad is about to move in the circumferential direction of the disc during braking of the vehicle, for example, the inner shim plate is moved with respect to the outer shim plate. The disk can be slid and displaced in the circumferential direction of the disk, and the friction pad can be prevented from becoming unstable. However, there is a problem that it is impossible to suppress the friction pad from vibrating in the radial direction of the disk, and the brake squealing phenomenon caused by the vibration of the friction pad cannot be sufficiently reduced.

  The present invention has been made in view of the above-described problems of the prior art, and an object of the present invention is to allow the friction pad to vibrate in the radial direction with respect to the piston while allowing the friction pad to move in the circumferential direction of the disk. It is an object of the present invention to provide a disc brake capable of restricting the noise and effectively reducing brake squeal and improving brake performance.

In order to solve the above-described problems, the present invention provides a pair of cylindrical pistons that are arranged across the outer periphery of a disk and that are arranged side by side in the disk circumferential direction so as to face at least one of both surfaces of the disk. A caliper that is provided, a pair of friction pads that are pressed against both surfaces of the disk via the caliper by driving the pair of pistons with a hydraulic pressure supplied from the outside to the caliper, the friction pads, The present invention is applied to a disc brake provided with a shim plate for preventing brake squealing that is positioned between the caliper and attached to the back plate of the friction pad.

A feature of the configuration adopted by the present invention is that the shim plate includes a flat plate portion extending in the circumferential direction and the radial direction of the disk along the back metal of the friction pad, and a radially inner side and an outer side of the flat plate portion. A plurality of mounting claws that are positioned and attached to the outer peripheral surface of the back metal and restrict displacement of the flat plate portion in the radial direction of the disc and allow displacement in the circumferential direction of the disc; And a restricting claw portion that protrudes toward the inner peripheral surface of the piston and restricts the displacement of the flat plate portion relative to the piston is formed from a single plate material , and the restricting claw portion is provided for each piston of the pair of pistons. are spaced in the radial direction by two as that Tadashi Seitsume be facing formed, separating direction of the two regulating claw portion is obliquely inclined with respect to the circumferential direction and the radial direction of the disk, the plate For the center line orthogonal to the longitudinal direction of the part Is disposed referred, and the disk circumferential direction spacing between the regulating claw portion located radially outward of the disk of the two regulating claws, radially inward of the disk of the two restricting pawl portion in that a configuration ing larger than the disk circumferential direction spacing between the regulating claw portion located.

As described above, according to the present invention, the flat plate portion of the shim plate is disc-to-disk with respect to the piston by the two restricting claw portions provided so as to be opposed to each other in the radial direction of each piston for each pair of pistons. can be obtained from being displaced in the radial and circumferential depression, friction pads displaced in the radial direction of the disk, can be regulated by also mounting claw portion for positional displacement. However, the mounting claw portion is configured to allow the friction pad to slide and displace in the circumferential direction of the disk. For this reason, the rotational torque from the disk is transmitted to the friction pad during the braking operation of the vehicle, and even if the friction pad is displaced in the rotation direction of the disk, the shim plate interposed between the back pad of the friction pad and the piston is On the other hand, the sliding displacement in the circumferential direction of the disk can prevent the rotational torque at this time from being transmitted to the piston and caliper side, and can effectively reduce the brake noise of the vehicle.

It is a front view which shows the disc brake by the reference technique of this invention. It is a top view of the disc brake shown in FIG. Disk brake FIG. 3 is an enlarged cross-sectional view seen from the direction of arrows III-III in FIG. It is a front view which shows the state which attached the shim board to the friction pad. It is the rear view which looked at the friction pad and shim board of FIG. 4 from the opposite side. It is a front view which shows the shim board in FIG. 4 as a single unit. It is an expanded sectional view which looked at the shim board from the arrow VII-VII direction in FIG. It is a front view which shows the shim board by embodiment of this invention .

  Hereinafter, the case where the disc brake according to the embodiment of the present invention is applied to a motorcycle as an opposed piston type disc brake provided with a cylindrical piston facing both sides of the disc will be described in detail according to the accompanying drawings. Explained.

Here, FIG. 1 to FIG. 7 show a reference technique as a premise of the present invention. In the figure, the disc brake has a caliper 2 disposed across the outer peripheral side of the disc 1 that rotates together with the wheels of the motorcycle. The caliper 2 is attached to a front fork (not shown) or the like of a two-wheeled vehicle in the vicinity of the disk 1, and presses each friction pad 10 described later toward both surfaces of the disk 1.

  The caliper 2 includes a one-side caliper portion 3 disposed on one side (for example, the outer side) of the disc 1 and another-side caliper portion 4 disposed on the other side (for example, the inner side) of the disc 1. And is composed of. The one side caliper portion 3 and the other side caliper portion 4 are formed to extend in the circumferential direction which is the rotation direction of the disk 1.

  Further, a pad housing portion 5 is formed between the one-side caliper portion 3 and the other-side caliper portion 4 at a central position in the circumferential direction of the disk 1. Each friction pad 10 is accommodated so as to sandwich the disk 1 from both axial sides. Here, a pair of cylinder holes 3A (only one is shown in FIG. 3) that are spaced apart in the rotational direction of the disk 1 and open into the pad accommodating portion 5 are formed as circular bottomed holes in the one-side caliper portion 3. Has been. On the other hand, a pair of cylinder holes 4A (only one is shown in FIG. 3) is formed in the other caliper portion 4 in the same manner.

  Reference numeral 6 denotes a pair of mounting holes constituting a vehicle mounting portion provided in the one-side caliper portion 3, and the mounting holes 6 are arranged in the circumferential direction of the disk 1 so as to be symmetric to the left and right as shown in FIG. They are spaced apart. A pair of bolts (not shown) are screwed into each mounting hole 6, whereby the caliper 2 is fixedly attached to the front fork.

  Reference numeral 7 denotes a brake fluid supply / discharge port. The supply / discharge port 7 is located between the pair of mounting holes 6 as shown in FIG. The supply / discharge port 7 is connected to a master cylinder hole (not shown) or the like via an external brake pipe. Further, in one caliper portion 3 and the other caliper portion 4, liquid passages (not shown) are formed for communicating the supply / discharge port 7 with the cylinder holes 3A and 4A, respectively.

  Reference numeral 8 denotes a pair of support pins that are detachably provided between the one-side caliper portion 3 and the other-side caliper portion 4, and each of the support pins 8 is more than the pad accommodating portion 5 as shown in FIG. The disk 1 is located radially outside and extends in the axial direction of the disk 1 and is spaced apart from each other in the circumferential direction of the disk 1. Each support pin 8 is provided by bridging between the one-side caliper portion 3 and the other-side caliper portion 4 and supports a friction pad 10 described later so as to be displaceable in the axial direction of the disk 1 in a suspended state. Is.

  Reference numeral 9 denotes a plurality of pistons provided in the cylinder holes 3A and 4A, respectively. Each piston 9 is formed as a bottomed cylindrical cup body as shown in FIG. It is slidably inserted in the hole 3A and in each cylinder hole 4A of the other caliper portion 4. These pistons 9 are slidably displaced in the axial direction of the disk 1 in the cylinder holes 3A, 4A by the brake hydraulic pressure supplied into the cylinder holes 3A, 4A during brake operation, and a friction pad 10 described later is moved. The disk 1 is pressed against the surface.

  Reference numeral 10 denotes a pair of friction pads that are pressed against both sides of the disk 1. Each friction pad 10 has a pad spring 16 (described later) in the pad housing 5 between the one side caliper part 3 and the other side caliper part 4. And slidably provided on both sides of the disk 1. These friction pads 10 are constituted by a back metal 11 and a lining 12.

  Here, the back metal 11 of the friction pad 10 is formed as a substantially rectangular plate body of a metal plate such as an iron plate as shown in FIGS. 3 to 5, and a lining 12 made of a friction material is fixed to the surface side thereof. Is provided. The lining 12 extends along the circumferential direction (rotation direction) of the disk 1 and is formed in a substantially fan shape as a whole.

  Further, as shown in FIGS. 4 and 5, the back metal 11 of the friction pad 10 includes an outer peripheral surface 11A, an inner peripheral surface 11B, left and right side (turn-in side, outlet-side) side surfaces 11C and 11D, and protrusions described later. It is comprised by the part 13 grade | etc.,. For example, two mounting grooves 11E are formed as shallow grooves on the outer peripheral surface 11A of the back metal 11 so as to be located between the respective protrusions 13 described later, and each of the mounting grooves 11E is formed in the circumferential direction of the outer peripheral surface 11A. It is arranged at a position that is left and right symmetrically spaced apart from each other.

  Further, on the inner peripheral surface 11B side of the back metal 11, a mounting groove 11F is also formed as a shallow groove in the middle portion in the circumferential direction. Further, mounting claws 14B and 14C of a shim plate 14 to be described later are mounted in these mounting grooves 11E and 11F so as to be displaceable in the circumferential direction of the disk 1. The shim plate 14 is mounted by the mounting claws 14B and 14C. The positional deviation in the radial direction of the disk 1 with respect to the back metal 11 is restricted.

  Reference numeral 13 denotes a pair of protrusions integrally formed between the outer peripheral surface 11A of the back metal 11 and the left and right side surfaces 11C, 11D. Each of the protrusions 13 is more than the outer peripheral surface 11A (lining 12) of the back metal 11. The disk 1 protrudes outward in the radial direction in a substantially U shape, and is spaced apart in the circumferential direction of the disk 1 so as to be symmetrical left and right.

  Each protrusion 13 is formed with a pair of pin holes 13A having an oval shape. Each of the support pins 8 is inserted into each pin hole 13A with a gap (free fitting), so that the friction pad 10 can be displaced in the axial direction of the disk 1 via each support pin 8. Supported (suspended).

  14 is a shim plate attached to the back metal 11 of each friction pad 10, and each shim plate 14 is disposed between the open end of each piston 9 and the back metal 11 as shown in FIG. It suppresses the occurrence of so-called brake squeal. The shim plate 14 is formed as a single piece as shown in FIGS. 6 and 7 by pressing a stainless steel plate having spring properties.

  Here, the shim plate 14 is bent from a flat plate portion 14A formed as a substantially rectangular flat plate extending in the circumferential direction and the radial direction of the disk 1 along the back surface of the back metal 11, and the peripheral portion of the flat plate portion 14A. For example, three mounting claws 14B, 14B, and 14C formed in a substantially S-shape, a pair of punched holes 14D formed in a contact portion with each piston 9 in the flat plate portion 14A, and the respective punched holes A pair of restricting claw portions 14E and 14F that are integrally formed with the flat plate portion 14A facing the 14D and elastically locked to the inner peripheral surface of the piston 9, and each protruding plate portion 15 described later.

  In the state where the restricting claw portions 14E and 14F of the shim plate 14 are engaged with the inner peripheral surface of the piston 9, as shown by the two-dot chain line in FIG. Is determined by the restricting claw portions 14E and 14F.

  In this case, the mounting claws 14B and 14B of the shim plate 14 are arranged away from the position on the outer side in the disk radial direction of the flat plate portion 14A in the left and right directions (disk circumferential direction). As a claw part hooked in the groove 11E, it is bent from the peripheral part of the flat plate part 14A and formed in a substantially S shape. Further, the other mounting claw portion 14C is disposed at a position closer to the inner side in the disc radial direction of the flat plate portion 14A and at a central portion in the left and right directions (disk circumferential direction), and is formed in the mounting groove 11F of the back metal 11. As a hook part to be hooked, it is bent from the peripheral part of the flat plate part 14A and formed in a substantially S shape.

  The shim plate 14 is attached to the outer peripheral surface 11A and the inner peripheral surface 11B of the back metal 11 via the mounting grooves 11E and 11F by these mounting claws 14B and 14C. ) Is regulated. However, these mounting claws 14B and 14C are formed so that the width dimension (dimension in the disk circumferential direction) is smaller than the mounting grooves 11E and 11F of the back metal 11, and the flat plate part 14A of the shim plate 14 is disc-shaped relative to the back metal 11. It is configured to allow displacement in the circumferential direction.

  Further, the pair of punching holes 14D are formed as substantially rectangular long holes extending in the diameter direction of the piston 9 and in the radial direction of the disk. Each punching hole 14D is arranged at a position on the outer side in the circumferential direction of the disc with respect to the left and right mounting claws 14B as shown in FIG. 6, and extends parallel to each other in the radial direction of the disc.

  Further, the restricting claw portions 14E and 14F of the shim plate 14 are disposed at positions facing each other via punching holes 14D extending in the radial direction of the disk, that is, positions facing each other in the radial direction of the disk. And each control nail | claw part 14E and 14F is bent and formed so that it may incline rather than the perpendicular with respect to the flat plate part 14A so that it may protrude toward the internal peripheral surface of piston 9 from the position of each punch hole 14D among the flat plate parts 14A. In addition, the restricting claw portions 14E and 14F are configured so as to have an inverted C shape, and are elastically locked to the inner peripheral surface of the piston 9.

  In this case, the restricting claws 14E and 14F are engaged with the inner peripheral surface of the piston 9 in the radial direction inward and the radial direction with respect to the inner peripheral surface of the piston 9 as shown in FIG. An elastic biasing force is applied outward. Accordingly, the restricting claw portions 14E and 14F restrict the displacement of the flat plate portion 14A of the shim plate 14 in the radial direction and the circumferential direction of the disk 1 with respect to the piston 9.

  Reference numeral 15 denotes a pair of projecting plate portions integrally formed on the shim plate 14 corresponding to the projecting portions 13 of the back metal 11. And is arranged so as to be symmetrical left and right apart in the circumferential direction of the disk. Each protruding plate 15 is provided with a pair of pin holes 15A having an oval shape in substantially the same manner as the pin holes 13A on the back metal 11 side.

  However, each pin hole 15A of the shim plate 14 (projecting plate portion 15) is formed to have a larger diameter than the pin hole 13A on the back metal 11 side. In the pin holes 15A, the support pins 8 are inserted (freely fitted) with a gap in the same manner as the pin holes 13A on the back metal 11 side. As a result, the shim plate 14 is supported (suspended) so as to be displaceable in the axial direction of the disk 1 via the support pins 8 in the same manner as the back metal 11 of the friction pad 10.

  Reference numeral 16 denotes a pad spring provided between the pad housing portion 5 of the caliper 2 and the back metal 11 of the friction pad 10. Each pad spring 16 moves each friction pad 10 in the axial direction of the disk 1. It is guided so as to be slidable along.

The opposed piston type disc brake according to the reference technology as the premise of the present invention has the above-described configuration, and the operation thereof will be described next.

  First, when the driver of the motorcycle performs a brake operation, the brake fluid pressure from the outside is supplied into the cylinder holes 3A and 4A of the caliper 2. As a result, the pair of pistons 9 slide in the cylinder holes 3A and 4A toward the disk 1 side. Each piston 9 presses the friction pad 10 toward both sides of the disk 1 to apply a braking force to the disk 1.

  Further, between the caliper portion 3 on one side and the caliper portion 4 on the other side of the caliper 2, a pad housing portion 5 for housing each friction pad 10 is formed on both sides in the axial direction of the disk 1. The rotational torque (friction torque) that each friction pad 10 receives from the disk 1 during the brake operation is received by the caliper 2 through the pad housing portion 5, and the caliper 2 thereby receives a pair of friction pads with respect to the disk 1. A strong braking force can be applied via 10.

Here, according to the reference technique , the shim plate 14 provided between the piston 9 on the caliper 2 side and the back metal 11 of the friction pad 11 is arranged along the back surface of the back metal 11 in the circumferential direction and the radial direction of the disk 1. The extending flat plate portion 14A is located on the radially inner side and the outer side of the flat plate portion 14A and is attached to the outer peripheral surface 11A and the inner peripheral surface 11B of the back metal 11 via mounting grooves 11E and 11F. A plurality of mounting claws 14B, 14C that restrict displacement in the radial direction and allow displacement in the circumferential direction of the disk, and project from the flat plate portion 14A toward the inner peripheral surface of the piston 9 so that the flat plate portion 14A protrudes from the piston 9. It is set as the structure which has several control nail | claw part 14E, 14F which controls that it displaces.

  Thereby, it is possible to suppress the shim plate 14 from being displaced in the radial direction, the circumferential direction, and the like of the disk 1 with respect to the piston 9 by the restricting claw portions 14E and 14F. Further, the plurality of mounting claws 14 </ b> B and 14 </ b> C provided on the shim plate 14 can restrict the friction pad 10 from being displaced or displaced in the radial direction of the disk 1. In this case, the mounting claw portions 14B and 14C are configured to allow the friction pad 10 to slide and displace in the circumferential direction of the disk 1.

  For this reason, the rotational torque from the disk 1 is transmitted to the friction pad 10 during the braking operation of the vehicle, and even if the friction pad 10 is displaced in the rotational direction of the disk 1, it is interposed between the back metal 11 of the friction pad 10 and the piston 9. The shim plate 14 that is slidably displaced in the circumferential direction of the disk 1 with respect to the back metal 11 can prevent the rotational torque at this time from being transmitted to the piston 9 and the caliper 2 side, such as the brake noise of the vehicle. Can be effectively reduced.

  In addition, it is possible to suppress the friction pad 10 from vibrating in the radial direction of the disk 1 with respect to the piston 9 and the caliper 2 by the mounting claws 14B and 14C and the regulation claws 14E and 14F provided on the shim plate 14. it can. As a result, the occurrence of brake squeal can be reduced, and the pair of support pins 8 can be prevented from being worn by the influence of vibration, and the durability and life can be improved.

  Further, the piston 9 and the friction pad 10 can be connected by the shim plate 14 so as to be integrated in the axial direction of the disk 1. Thus, when the brake operation is released, the friction pad 10 can be returned together with the piston 9 by the shim plate 14, and the pair of friction pads 10 are separated from both surfaces of the disk 1 to generate drag torque, pad uneven wear. Generation | occurrence | production etc. can be reduced.

  The flat plate portion 14A of the shim plate 14 is formed with a pair of punched holes 14D in contact portions with the respective pistons 9. The punched holes 14D are formed in the diameter direction of the piston 9 and in the radial direction of the disk. The configuration extends in a substantially rectangular shape. Thereby, the distribution state of the pressing force received by the friction pad 10 from the piston 9 can be adjusted by the punching hole 14D, and the operation feeling of the brake lever can be adjusted.

Moreover, since it is not necessary to use the grease for suppressing the brake squeal for the shim plate 14 employed in the above-mentioned reference technology , the brake squeal can be reduced without impairing the operation feeling of the brake lever. In addition, it is possible to simultaneously achieve a low pressure noise, heat insulation, brake lever operation feeling, etc., and to reduce the number of parts and cost.

  Further, since the shim plate 14 is configured to be tangentially displaced in the circumferential direction of the disk with respect to the back metal 11 of the friction pad 10, even after the friction pad 10 is inserted into the pad housing portion 5 of the caliper 2, The position of the pad alone can be adjusted. Furthermore, when the disc brake is shipped as a product, the inter-pad spacer (not shown) or the like that is normally used can be made unnecessary by the shim plate 14 and can be eliminated.

Next, FIG. 8 shows a form of implementation of the present invention, features of this embodiment is configured inclined obliquely punched hole formed in the flat portion of the shim plate circumferential direction of the disk, with respect to the radial direction There is. In the present embodiment, the same components as those in the reference technique described above are denoted by the same reference numerals, and the description thereof is omitted.

In the figure, reference numeral 21 denotes a shim plate employed in the present embodiment. The shim plate 21 is formed in substantially the same manner as the shim plate 14 described in the reference technology , and is a flat plate portion 21A, for example, three attachment claws 21B, 21C, a pair of punching holes 21D, a pair of restricting claw portions 21E and 21F, a pair of protruding plate portions 15 and the like.

However, the shim plate 21 in this case is different from the reference technique in that a pair of punched holes 21D having a substantially rectangular shape is formed obliquely with respect to the circumferential direction and the radial direction of the disk. Thereby, each punching hole 21D is arranged with an inclination (inclination angle) of, for example, 120 to 150 degrees, preferably about 135 degrees with respect to the protruding plate portion 15 protruding outward in the radial direction of the disk. .

  Further, the restricting claws 21E and 21F of the shim plate 21 are positioned on both sides in the longitudinal direction of the substantially rectangular punching hole 21D, and are inclined obliquely with respect to the circumferential direction and the radial direction of the disc in the same manner as the punching hole 21D. Has been placed. The restricting claw portions 21E and 21F restrict the displacement of the flat plate portion 21A of the shim plate 21 in the radial direction and the circumferential direction with respect to the piston 9 by engaging with the inner peripheral surface of the piston 9. To do.

  Reference numeral 22 denotes left and right cutout portions provided on the flat plate portion 21A of the shim plate 21, and each cutout portion 22 cuts the corners of the flat plate portion 21A located on the radially inner side of the disk obliquely. It is formed by. Each of the cutout portions 22 is formed so as to be inclined with respect to the circumferential direction and the radial direction of the disk so as to extend in parallel with the pair of punching holes 21D. In other words, the cutout portion 22 in this case is located on the opposite side of the protruding plate portion 15 with respect to the protruding plate portion 15 across the flat plate portion 21A, and is 120 to 150, for example, with respect to the protruding plate portion 15 like the punching hole 21D. Are arranged with an inclination (an inclination angle) of about 135 degrees, preferably about 135 degrees.

  Here, as shown by a two-dot chain line in FIG. 8, the relative position of the inner peripheral surface of the piston 9 with the shim plate 21 is determined by the regulation claws 21E and 21F. The opening end side of the piston 9 that contacts the flat plate portion 21 </ b> A of the shim plate 21 is disposed at a position where a part thereof protrudes outward from the flat plate portion 21 </ b> A by the cutout portion 22. Thereby, the range in which the piston 9 presses the back metal 11 of the friction pad 10 via the shim plate 21 is changed according to the shape and size (area) of the cut-out portion 22.

Thus, also in the present embodiment configured as described above, the use of the shim plate 21 can effectively reduce the brake squeal of the vehicle and the like, and can obtain substantially the same operational effects as the above-described reference technique. . In particular, in the present embodiment, each punching hole 21D formed in the flat plate portion 21A of the shim plate 21 is provided to be inclined obliquely, and the outer side (a portion closer to the inner side in the radial direction of the disk) is provided with a punching hole 21D. The cut portion 22 is formed so as to be inclined obliquely with respect to the circumferential direction and the radial direction of the disk so as to extend in parallel.

  As a result, the piston 9 that comes into contact with the flat plate portion 21A of the shim plate 21 is disposed at a position where a part of the piston 9 protrudes outward from the flat plate portion 21A by the cutout portion 22. The contact range, that is, the range in which the piston 9 presses the back metal 11 of the friction pad 10 via the shim plate 21 can be adjusted by the cutout portion 22, and uneven wear of the friction pad 10 can be suppressed. Further, by providing the cutout portion 22 in the flat plate portion 21A of the shim plate 21, it is possible to suppress the friction pad 10 from vibrating in the circumferential direction of the disk and to provide a vibration damping effect.

In the form of pre-you facilities, for example, on one side caliper part 3 of the caliper 2 is provided a plurality of mounting holes 6, the non-rotating portion of the vehicle caliper 2 by a bolt which is screwed into these attachment holes 6 (the front fork The case where it is fixed and attached to) is described as an example. However, the present invention is not limited to this. For example, an attachment member (carrier) may be provided in a non-rotating portion of the vehicle, and the caliper may be supported by the attachment member so as to be displaceable in the axial direction of the disk.

Further, the present invention is not limited to the opposed piston type disc brake. For example, the piston is slidably provided on the inner leg portion of the caliper through the cylinder hole, and the outer leg portion (outer claw portion) side of the caliper is provided. The present invention may also be applied to a so-called floating caliper type disc brake configured to abut on the outer friction pad .

  Furthermore, in the above-described embodiment, the case where the disc brake is applied to a motorcycle has been described as an example. However, the present invention is not limited to this, and can be widely applied to disc brakes used in vehicles such as four-wheeled vehicles.

1 disc 2 caliper 3 one side caliper part 3A, 4A cylinder hole 4 other side caliper part 5 pad receiving part 6 mounting hole (vehicle mounting part)
8 Support pin 9 Piston 10 Friction pad 11 Back metal 11A Outer peripheral surface 11B Inner peripheral surface 11C, 11D Left and right side surfaces 11E, 11F Mounting groove 12 Lining 14, 21 Shim plate 14A, 21A Flat plate portion 14B, 14C, 21B, 21C Claw part 14D, 21D Punching hole 14E, 14F, 21E, 21F Restriction claw part 16 Pad spring

Claims (1)

A caliper provided with a pair of cylindrical pistons arranged across the outer peripheral side of the disk and arranged opposite to at least one of the both surfaces of the disk and arranged side by side in the disk circumferential direction;
A pair of friction pads that are pressed against both sides of the disk via the caliper by driving the pair of pistons with hydraulic pressure supplied from the outside to the caliper;
In a disc brake comprising: a shim plate for preventing brake squealing, which is located between each friction pad and the caliper and is attached to a back metal of the friction pad,
The shim plate is
A flat plate portion extending in the circumferential direction and the radial direction of the disk along the back metal of the friction pad;
A plurality of plates that are positioned on the inner side and the outer side of the flat plate portion and are attached to the inner and outer peripheral surfaces of the back plate to restrict displacement of the flat plate portion in the radial direction of the disc and allow displacement in the disc circumferential direction. Mounting claws,
A restricting claw that protrudes from the flat plate portion toward the inner peripheral surface of the piston and restricts the displacement of the flat plate portion with respect to the piston is formed from a single plate material .
The regulating claw portion, for each piston of the pair of pistons, spaced in a radial direction of the piston is formed by two as that Tadashi Seitsume be opposed, spaced directions of said two regulating pawl portion Is tilted obliquely with respect to the circumferential direction and the radial direction of the disk , and is disposed symmetrically with respect to a center line perpendicular to the longitudinal direction of the flat plate portion , and
Of the two restricting claw portions, the disc circumferential interval between the restricting claw portions located on the outer side in the radial direction of the disc is the disc circumference between the restricting claw portions located on the radially inner side of the disc among the two restricting claw portions. A disc brake characterized by being configured to be larger than the direction interval .

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