JP6405131B2 - Vehicle disc brake - Google Patents

Description

  The present invention relates to a vehicle disc brake, and more particularly to a vehicle disc brake in which a pad spring is disposed between a bridge portion of a caliper body and a friction pad.

  Conventionally, in a disc brake for a vehicle, a pad spring is arranged between the bridge portion of the caliper body and the friction pad to prevent the friction pad from rattling and to prevent the friction pad from dragging when releasing the brake. was there. As this pad spring, from the outside in the radial direction of the disk, a main body part that comes into contact with the back plate of the friction pad and suppresses the backlash of the friction pad, and a pad return part that urges the friction pad in a direction to separate from the disk rotor Are formed of leaf spring materials, and these leaf spring materials are connected by rivets (see, for example, Patent Document 1). Further, from the outer side in the radial direction of the disk, from the intermediate position of the action part side spring part, the reaction part side spring part, and the reaction part side spring part that come into contact with the back plate of the friction pad and suppress the backlash of the friction pad, There is one that is integrally provided with a pad return portion that protrudes in a direction orthogonal to the reaction portion side spring portion, elastically engages with the friction pad on the action portion side, and prevents dragging of the friction pad (for example, (See Patent Document 2).

JP-A-9-112599 Japanese Utility Model Publication No. 6-32770

  However, the pad spring disclosed in Patent Document 1 is formed by connecting two leaf spring materials with rivets, which increases the number of parts and increases the cost of assembly work. It was. Furthermore, although the pad spring of patent document 2 can form the action part side spring part, the reaction part side spring part, and the pad return part from one board | plate material, a pad return part gives elastic force. For this reason, since a plurality of elastic loop portions that bulge outward in the radial direction of the disk are provided, a predetermined space must be secured between the friction pad and the bridge portion, and the pad spring and caliper body are large. In addition, there is a risk of assembly, and it takes time to assemble, and the cost is high.

  SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a vehicle disc brake that can prevent backlash of the friction pad and dragging of the friction pad when releasing the brake with a pad spring while reducing the cost. .

In order to achieve the above object, a disk brake for a vehicle according to the present invention is disposed on one side of the disk rotor, and is disposed on the other side of the disk rotor, with an action portion having a cylinder hole for accommodating a piston, A caliper body is formed by connecting a reaction portion having a reaction force claw with a bridge portion, and the caliper body is fixed to a car body on one side of the disk rotor via a pair of slide pins. In a vehicle disc brake that supports a slidable disc in the axial direction and has a pad spring disposed between a pair of friction pads disposed between the disc rotor and the bridge portion, the pad spring includes the pair of friction pads. A main body that is disposed between the friction pad and the bridge portion and presses the pair of friction pads inward in the disk radial direction. And a pad return part that abuts against the friction pad on the action part side and presses the friction pad on the action part side to the anti-disk rotor side when braking is released, This is formed by bending extending pieces extending from both ends of the disk in the disk circumferential direction to the side opposite to the disk rotor , and symmetrical with respect to the disk axial direction line passing through the disk circumferential center of the main body. It is characterized by being formed into a shape .

  Further, the main body portion is disposed between the action portion side spring portion disposed between the friction pad on the action portion side and the bridge portion, and between the friction pad on the reaction portion side and the bridge portion. Each of the reaction portion side spring portions is formed with bending pieces bent inward in the disk radial direction at both ends of the reaction portion side spring portion in the disk circumferential direction. An elastic loop portion formed by bending the extending piece extending from the bent piece to the side opposite to the disc rotor from the outside of the bent piece into an arc shape in the disc axial direction; and from the elastic loop portion to the working portion side An elastic piece extending toward the protruding portion of the friction pad that protrudes outward from the outer periphery of the disk rotor, and an abutting portion that is formed at the tip of the elastic piece and contacts the protruding portion. Have To be suitable.

Further, the friction pads are respectively suspended by hanger pins suspended from the caliper body, and the pad return portion is in contact with the inner side in the disk radial direction than the hanger pin insertion hole formed in the friction pad. In this case, it is preferable that the friction pad is in contact with the center side of the friction pad rather than the hanger pin insertion hole . Also, the body portion protrudes inward radial direction of the disk, the contact with the disk rotor side surface of said friction pad of the reacting portion side, the support piece for supporting said friction pad of the reacting portion side is formed It is preferable. Further, the vehicle disc brake may be a mechanical disc brake.

  According to the vehicle disc brake of the present invention, the pad spring can suppress the backlash of the friction pad by the main body portion that presses the friction pad inward in the radial direction of the disc. By pressing the friction pad on the action part side toward the anti-disk rotor side, the friction pad on the action part side can be separated from the disk rotor, and dragging of the friction pad can be suppressed. In addition, since the pad spring is integrally formed with the body portion and the pad return portion, the manufacturing cost can be reduced, and the pad return portion is bent from both ends in the disk circumferential direction of the body portion. By bending the extension piece extended to the disc rotor side, the size of the pad spring in the disc axial direction can be suppressed, and there is no possibility that the caliper body becomes large.

  Furthermore, a bent piece that is bent inward in the radial direction of the disk is formed at both ends in the disk circumferential direction of the reaction part side spring part of the main body part, and each pad return part extends from the bent piece to the counter disk rotor side. An elastic loop part formed by bending the extended piece back from the outer side of the bent piece into an arc shape in the disk axial direction, and the outer side of the friction pad on the working part side protruding from the outer periphery of the disk rotor. Since the elastic piece that extends toward the protruding portion and the contact portion that contacts the protruding portion are formed, the pad return portion can be easily formed in a simple shape by bending the extending piece. It can be formed and the assemblability can be improved.

  Further, the friction pad is suspended by hanger pins suspended on the caliper body, and the pad return portion is brought into contact with the hanger pin insertion hole formed in the friction pad inward in the disk radial direction, thereby sliding the friction pad. The vicinity of the center hanger pin insertion hole can be urged by the pad return portion, and the friction pad can be well separated from the disk rotor when braking is released. Furthermore, by bringing the pad return portion into contact with the center side of the friction pad rather than the hanger pin insertion hole, the position close to the center of gravity of the friction pad can be urged by the pad return portion, and the friction pad can be better disc It can be separated from the rotor. Further, by forming the pad return portion in a symmetrical shape with respect to the disc axial line passing through the central portion of the disc circumferential direction of the main body portion, the disc return side and the return side of the friction pad at the pad return portion It can be energized with good balance.

  Furthermore, the main body portion protrudes inward in the radial direction of the disc, contacts the disc rotor side surface of the friction pad on the reaction portion side, and forms a support piece that supports the friction pad on the reaction portion side, so that when releasing the brake, The reaction force generated when the pad return part presses the friction pad on the action part side toward the counter disk rotor can transmit the reaction force to the friction pad on the reaction part side via the support piece. Can be well separated from the disk rotor. Further, since the vehicular disc brake is a mechanical disc brake, it is possible to suppress rattling of the friction pad with a small number of parts, and the friction pad can be separated from the disc rotor when the brake is released.

It is II sectional drawing of FIG. 1 is a partial cross-sectional rear view of a vehicle disc brake showing an embodiment of the present invention. It is III-III sectional drawing of FIG. 1 is a front view of a vehicle disc brake showing an embodiment of the present invention. It is a top view of the disk brake for vehicles similarly. It is a perspective view of the pad spring which shows one example of the present invention.

  FIG. 1 to FIG. 6 are views showing one embodiment of a vehicle disc brake according to the present invention. An arrow A indicates a rotation direction of a disc rotor that rotates integrally with a wheel when the vehicle moves forward. The disk entry side is assumed to be when the vehicle is moving forward.

  The disc brake 1 of this embodiment is moved in the disc axial direction via a disc rotor 2, a caliper bracket 3 attached to the vehicle body at one side of the disc rotor 2, and slide pins 4 and 4 to the caliper bracket 3. A pin-sliding caliper body 5 that can be supported, and a pair of friction pads 6 and 7 that are disposed to face each other with the disk rotor 2 interposed between the action portion 5a and the reaction portion 5b of the caliper body 5. A pad spring 8 is disposed between the friction pads 6 and 7 and the bridge portion 5 c of the caliper body 5.

  The caliper body 5 is connected to the action portion 5a disposed on one side of the disk rotor 2 and the reaction portion 5b disposed on the other side of the disk rotor 2 across the outside of the disk rotor 2. And the bridge portion 5c. A pair of mounting arms 5d and 5d are provided on the action portion 5a so as to protrude parallel to one side surface of the disk rotor 2 from the disk inlet side and the outlet side, and protrude from the caliper bracket 3 to the mounting arms 5d and 5d. Pin insertion holes 5e through which the provided slide pins 4 and 4 are inserted are formed. Further, a wire guide arm 5f is projected on the disk delivery side of the acting portion 5a on the side opposite to the disk rotor, and a cylinder hole 5g and a bearing hole 5h are formed inside. The cylinder hole 5g is formed in the disk axial direction, opens to the disk rotor 2 side, and the piston 9 is inserted so as to be movable. The bearing hole 5h is a bottomed hole provided at one end of the cylinder hole 5g on the outer surface of the action part 5a and orthogonal to the cylinder hole 5g. A push rod 11 is interposed between the cam shaft 10 and the piston 9. An outer end portion 10a of the cam shaft 10 protrudes upward from the bearing hole 5h, and an operating lever 12 is attached to the outer end portion 10a using a bolt 13 and a washer 14, and on the outer periphery of the outer end portion 10a. A return spring 15 is provided.

  The return spring 15 is operated by extrapolating the coil portion 15a to the outer end portion 10a and bringing one end protruding from the coil portion 15a into contact with the outer surface of the action portion 5a and the other end against the operating lever 12. The lever 12 is biased in the non-operating direction by a return spring 15. A wire cable 16 is connected to the distal end side of the actuating lever 12, and the wire cable 16 is routed in the front direction of the vehicle body through the wire guide arm 5f, and a brake operator (not shown) such as a brake pedal or an operating lever. It is connected to. A reaction force claw 5i is provided in the reaction portion 5b in parallel with the other side surface of the disc rotor 2. A mounting groove 5k for mounting the pad spring 8 is provided in the disc circumferential center of the inner wall of the bridge portion 5c. It is formed in the axial direction.

  The friction pads 6, 7 are formed by fixing linings 6 a, 7 a that are in sliding contact with the side surfaces of the disk rotor 2 to metal back plates 6 b, 7 b, and between the action parts 5 a and reaction parts 5 b of the caliper body 5. Are hung on a pair of hanger pins 17, 17 respectively. The linings 6a and 7a are attached to the back plates 6b and 7b on the inner side in the radial direction of the disc, and the hanger pins 17 and 17 are inserted into the protruding portions 6c and 7c arranged to protrude outward from the outer periphery of the disc rotor 2, respectively. Is done.

  The pad spring 8 is formed by cutting a single plate material into a predetermined shape and then pressing it, and a main body portion 8a that presses the friction pads 6 and 7 inward in the radial direction of the disk. A pair of pad return portions 8b and 8b for separating the friction pads 6 and 7 from the disk rotor 2 by pressing the friction pad 6 on the 5a side against the disk rotor side are provided.

  The main body portion 8a includes a mounting portion 8d provided at the center with a protruding portion 8c in the disk axial direction that is fitted in the mounting groove 5k formed in the bridge portion 5c, and a disk portion from both sides in the disk circumferential direction of the mounting portion 8d. A pair of action part side spring parts 8e, 8e that extend toward the entry side and the disk delivery side and are respectively disposed between the friction pad 6 on the action part 5a side and the bridge part 5c, and an attachment part 8d. A pair of reaction part side springs that extend from both sides of the disk in the circumferential direction toward the disk entry side and the disk delivery side and are disposed between the friction pad 7 on the reaction part 5b side and the bridge part 5c. Parts 8f and 8f.

  Each acting portion side spring portion 8e extends from the mounting portion 8d so as to incline inward in the radial direction of the disk, and includes a first abutting portion 8g that abuts against the protruding portion 6c of the friction pad 6 on the acting portion 5a side. A first outer end portion 8h extending from the one abutting portion 8g outward in the disc radial direction and extending inward in the disc radial direction along the side portion of the protruding portion 6c is provided. Each reaction portion side spring portion 8f is gradually inclined inward in the disk radial direction from the attachment portion 8d, and a second contact portion 8i that contacts the protrusion 7c of the friction pad 7 on the reaction portion 5b side, and the second contact portion. A second outer end portion 8j extending from the portion 8i to the outer side in the radial direction of the disc and then extending inward in the radial direction of the disc along the side portion of the protruding portion 7c, and an inner side in the radial direction of the disc from the second outer end portion 8j And a bent piece 8k which is bent and protruded. Furthermore, between the attachment part 8d of each reaction part side spring part 8f and the second contact part 8i, the reaction part 5b side comes into contact with the side surface of the disk rotor of the protrusion 7c of the friction pad 7 on the reaction part 5b side. Support pieces 8m for supporting the friction pads 7 are formed.

  Each pad return portion 8b is formed by bending an extended piece 8n extending from the side of the bent piece 8k on the side opposite to the disc rotor to the side opposite to the disc rotor. An elastic loop portion 8p formed by bending the extended piece 8n back to the disk axial direction from the outside of the bent piece 8k, and a protruding portion 6c of the friction pad 6 on the action portion 5a side from the elastic loop portion 8p. And an elastic piece 8q extending in the disc axial direction, and a third abutting portion 8r (abutting portion of the present invention) formed at the tip of the elastic piece 8q and abutting against the protruding portion 6c. . The action portion side spring portions 8e, 8e, the reaction portion side spring portions 8f, 8f, and the pad return portions 8b, 8b are in relation to a disc axial line CL1 passing through the central portion of the main body portion 8a in the disc circumferential direction. Each is formed in a symmetrical shape, that is, it is formed in a symmetrical shape with respect to the protruding portion 8c.

  The pad spring 8 formed in this way is assembled to the caliper body 5 by fitting the protruding portion 8c into the mounting groove 5k of the bridge portion 5c, and the first contact portion 8g of each action portion side spring portion 8e The second contact part 8i of each reaction part side spring part 8f abuts against the outer surface in the disk radial direction of the protrusion part 6c of the friction pad 6 on the action part 5a side, and the protrusion part 7c of the friction pad 7 on the reaction part 5b side. The two friction pads 6 and 7 are biased inward in the radial direction of the disk by abutting against the outer surface in the radial direction of the disk. Further, each support piece 8m comes into contact with the disk rotor side surface of the protruding portion 7c to support the friction pad 7 on the reaction portion 5b side. Each pad return portion 8b has a third abutting portion 8r on the inner side in the disk radial direction than the hanger pin insertion hole 6d formed in the protruding portion 6c of the friction pad 6 on the acting portion 5a side, and the hanger pin. The friction pads 6 are in contact with the center side of the insertion holes 6d.

  In the disc brake 1 of the present embodiment formed as described above, when the brake operator is operated, the wire cable 16 is pulled, and the operating lever 12 and the camshaft 10 resist the elastic force of the return spring 15. As a result, the push rod 11 is pushed toward the disc rotor 2. As a result, the piston 9 is pushed to the disk rotor 2 side, and the lining 6a of the friction pad 6 on the action part 5a side is slid to one side surface of the disk rotor 2 against the elastic force of the pad return portions 8b and 8b. Make contact. Due to this reaction, the caliper body 5 slides in the direction of the action part while being guided by the slide pins 4, 4, and the reaction force claw 5 i resists the elastic force of the pad return parts 8 b, 8 b and causes friction on the reaction part 5 b side. The lining 7a of the pad 7 is brought into sliding contact with the other side of the disk rotor 2 to perform a braking action.

  At this time, since the friction pads 6 and 7 are biased inward in the radial direction of the disk by the action portion side spring portions 8e and 8e and the reaction portion side spring portions 8f and 8f, the friction pads 6 and 7 have a backlash. Can be suppressed. Further, when the brake is released, the pad return portions 8b and 8b are returned to the initial state, so that the friction pad 6 on the acting portion 5a side is separated from the disk rotor 2 and this reaction force is transmitted through the support pieces 8m and 8m. The friction pad 7 on the reaction portion 5b side is transmitted to the friction pad 7 on the reaction portion side, and the friction pad 7 on the reaction portion side is also separated from the disk rotor 2, thereby preventing the friction pads 6 and 7 from being dragged. Further, the pad return portions 8b and 8b are such that the third contact portion 8r is on the inner side in the radial direction of the disk with respect to the hanger pin insertion holes 6d and 6d of the friction pad 6, and more than the friction pad with respect to the hanger pin insertion holes 6d and 6d. 6 is in contact with the center side of the friction pad 6, so that the position close to the slide center of the friction pad 6 and close to the center of gravity can be urged by the pad return portions 8b and 8b. Can be separated from the disk rotor 2.

  Furthermore, since the pad spring 8 can integrally form the main body portion 8a and the pad return portions 8b and 8b with a simple shape, the cost can be reduced. Further, the pad spring 8 is formed by bending the extension piece 8n in which each pad return portion 8b is extended from the both ends in the disk circumferential direction of the main body portion 8a to the opposite disk rotor side. The size in the disk axis direction can be suppressed. Further, since the elastic loop portion 8p is disposed outside both ends of the reaction portion side spring portion 8f in the circumferential direction of the disc, the space between the friction pads 6, 7 and the bridge portion 5c can be kept small. There is no risk of the brake 1 becoming large.

  The present invention is not limited to the above-described embodiment, and can be applied to a hydraulic disc brake. Further, the friction pad is not limited to one suspended by a hanger pin, but may be one in which an ear piece formed on the back plate is inserted into a pad guide groove formed on the caliper bracket. Further, the shape of the body portion of the pad spring is arbitrary, and the body portion and the pad return portion are not formed symmetrically with respect to the disk axial line CL1 passing through the center portion of the body portion in the disk circumferential direction. May be. Further, the mounting groove formed in the bridge portion is not limited to the one in which the ridge portion is fitted and the pad spring is attached to the bridge portion, but the engagement piece provided on the pad spring is engaged with the mounting groove to the bridge portion. It can be attached. Further, the pad spring may not be provided with a support piece that contacts the disk rotor side surface of the friction pad on the reaction portion side.

DESCRIPTION OF SYMBOLS 1 ... Disc brake, 2 ... Disc rotor, 3 ... Caliper bracket, 4 ... Slide pin, 5 ... Caliper body, 5a ... Action part, 5b ... Reaction part, 5c ... Bridge part, 5d ... Mounting arm, 5e ... Pin insertion hole 5f: wire guide arm, 5g: cylinder hole, 5h: bearing hole, 5i ... reaction force claw, 5k ... mounting groove, 6, 7 ... friction pad, 6a, 7a ... lining, 6b, 7b ... back plate, 6c, 7c ... Projection, 6d ... Hanger pin insertion hole, 8 ... Pad spring, 8a ... Body part, 8b ... Pad return part, 8c ... Projection part, 8d ... Mounting part, 8e ... Action part side spring part, 8f ... Reaction Part-side spring part, 8g ... first contact part, 8h ... first outer end part, 8i ... second contact part, 8j ... second outer end part, 8k ... folded piece, 8m ... support piece, 8n ... Extension piece, 8p ... elastic loop part, 8q ... elastic piece 8r ... third contact portion, 9 ... piston, 10 ... cam shaft, 10a ... outer end portion, 11 ... push rod, 12 ... operating lever, 13 ... bolt, 14 ... washer, 15 ... return spring, 15a ... coil portion 16 ... Wire cable, 17 ... Hanger pin

Claims (6)

A bridge part connects an action part that is arranged on one side of the disk rotor and has a cylinder hole that accommodates a piston, and a reaction part that is arranged on the other side of the disk rotor and has a reaction force claw. A caliper body is formed, and the caliper body is slidably supported in a disk axial direction via a pair of slide pins on a caliper bracket fixed to the vehicle body on one side of the disc rotor, and the disc rotor is sandwiched between the caliper body and the caliper body. In the vehicle disc brake in which a pad spring is disposed between the pair of friction pads and the bridge portion, the pad spring is disposed between the pair of friction pads and the bridge portion. A main body portion that presses the friction pad inward in the radial direction of the disk, and the friction pad on the action portion side is in contact with the friction pad to release the brake. A pad return portion that presses the friction pad on the use portion side toward the anti-disk rotor side, and the pad return portion extends from both ends of the main body in the disk circumferential direction to the anti-disk rotor side. A vehicular disc brake, wherein the vehicular disc brake is formed by bending a protruding piece and formed symmetrically with respect to a disc axial direction line passing through a central portion in the disc circumferential direction of the main body portion . The main body is disposed between an action part side spring part disposed between the friction pad on the action part side and the bridge part, and between the friction pad on the reaction part side and the bridge part. A reaction part-side spring part, each of the reaction part-side spring part is formed with bending pieces bent inward in the disk radial direction at both ends in the disk circumferential direction,
Each pad return part is an elastic loop part formed by bending back the extended piece extending from the bent piece to the side opposite to the disk rotor in an arc shape from the outer side of the bent piece; An elastic piece that extends from the elastic loop portion toward a protruding portion that protrudes outward from the outer periphery of the disk rotor of the friction pad on the action portion side, and is formed at the tip of the elastic piece, and the protrusion The vehicle disc brake according to claim 1, further comprising a contact portion that contacts the portion.   The friction pads are respectively suspended by hanger pins suspended from the caliper body, and the pad return portion is in contact with the inner side in the disk radial direction than the hanger pin insertion hole formed in the friction pad. The vehicle disc brake according to claim 1 or 2, characterized in that   4. The vehicle disc brake according to claim 3, wherein the pad return portion is in contact with a center side of the friction pad with respect to the hanger pin insertion hole. The main body part protrudes inward in the disk radial direction, abutting against the disk rotor side surface of the friction pad on the reaction part side, and a support piece for supporting the friction pad on the reaction part side is formed. The disc brake for vehicles according to any one of claims 1 to 4 characterized by things. Wherein any one vehicular disc brake according to claim 1, wherein the vehicle disc brake is a mechanical disc brake.

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