JP2009257514A - Vehicular disc brake - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a vehicular disc brake capable of hanging a friction pad by one hanger pin, reducing the size of a pad spring, reducing cost and weight and improving maintenance performance. <P>SOLUTION: The friction pads 4, 4 are arranged between a pair of action parts 3a, 3b arranged opposing to each other while sandwiching a disc rotor 2 and the disc rotor 2. The friction pad 4 is hung by the hanger pin 11 inserted to a hanging piece 4c provided at the center on the outer face in the disc radial direction, and looseness is prevented by the pad spring 5. The pad spring 5 is provided with a fitting part 5a suitable for the inner face in the disc radial direction of a bridge part 3c; a first pressing piece 5b elastically abutting on the disc turning-in side face of the hanging piece 4c and pressing each friction pad 4 against the disc turning-out side; and a second pressing piece 5c elastically abutting on the disc turning-in side of the disc radial direction outer face of each friction pad 4 and pressing the disc turning-in side of the friction pad 4 against the disc radial direction inner side. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a vehicle disc brake used in a traveling vehicle such as an automobile or a motorcycle, and more specifically, a friction pad is suspended by using one hanger pin on both sides of a disc rotor. The present invention relates to a structure of a piston-opposed vehicle disc brake in which rattling is suppressed by a pad spring.

In the piston-opposed vehicle disc brake in which the backlash of the friction pad is suppressed by a pad spring, suspension pieces are provided on the disc entry side and the exit side of the friction pad so as to avoid the bridge portion. The friction pad is suspended by two hanger pins so as to be movable in the disk axial direction, and the pad spring is elastically brought into contact with the disk inlet side and the outlet side of the disk radial direction outer surface of the friction pad. There is one provided with a pair of spring pieces that suppress the backlash (for example, see Patent Document 1).
Japanese Patent Laid-Open No. 2007-1000074

  However, in the above, the number of parts is increased because two hanger pins are used to suspend the friction pad. The pad spring elastically contacts the pressing piece with the disk feed-in side and the feed-out side of the friction pad on the outer side in the radial direction of the disk. Since it has a size extending to the side, the material cost has been increased. Furthermore, when replacing the friction pad, the pad spring may fall off the caliper body, and the replacement work is time-consuming.

  Accordingly, the present invention provides a vehicle disk that can suspend a friction pad with a single hanger pin, reduce the size of the pad spring, reduce the cost and weight, and improve the maintainability. The purpose is to provide a brake.

  In order to achieve the above object, a vehicle disc brake according to the present invention has a caliper body in which a pair of action portions arranged opposite to each other with a disc rotor interposed therebetween is connected by a bridge portion straddling the outer periphery of the disc rotor, when the vehicle advances. A pair of friction pads is arranged between the torque receiving part on the disk inlet side and the torque receiving part on the disk outlet side, and a suspension piece is provided on each friction pad so as to straddle the disk rotor on the caliper body. A hanger pin suspended in the disk axial direction is inserted into the suspension piece, the pair of friction pads are suspended so as to be movable in the disk axial direction, and a pad spring that elastically contacts the pair of friction pads is disposed. In the disc brake for a vehicle, the friction pad has a hanging piece projecting from the outer surface in the radial direction of the disc, and one hanger pin is provided on the hanging piece. Are inserted in the disk radial inner side surface of the bridge portion, and the pad springs are fitted to the disk radial inner side surface of the bridge portion. A fitting portion, a pair of first pressing pieces that elastically contact the disk insertion side of the suspension piece and press each friction pad to the disk delivery side, and a disk insertion on the disk radial outer surface of each friction pad And a pair of second pressing pieces that elastically contact the disk side and press the disk insertion side of the friction pad inward in the disk radial direction.

  Further, the caliper body has an engagement surface of the pad spring formed on the disk delivery side of the bridge portion, and the fitting portion of the pad spring is between the engagement surface of the bridge portion and the housing recess. A flat portion disposed on the inner surface in the radial direction of the disk, and a first clamping piece provided on both ends of the flat surface portion and holding the bridge portion between the engaging surface and the receiving recess and the holding portion A second bent piece on the concave side, the first pressing piece being continuous with the second held piece and bent along the inner surface of the receiving concave part, and the convex bent part A first pressing portion that elastically contacts a disk insertion side surface of the hanging piece at a tip end side of the suspension portion, and the second pressing piece is located outside the radial direction of the friction pad from the tip portion of the convex bent portion. A spring piece extending along the side surface toward the disk inlet side; The spring piece may include a second pressing portion that elastically contacts the end of the friction pad at the end of the friction pad, and a protrusion that protrudes toward the end of the disc is formed on the engagement surface. It is preferable that the first holding piece is engaged with the protrusion.

  Further, the hanger pin includes an annular groove in an axially intermediate portion, and the pad spring elastically contacts the inner surface of the annular groove in the radial direction of the disk to support the hanger pin from the inner side in the radial direction of the disk. It is good to have.

  According to the vehicle disc brake of the present invention, the friction pad can be suspended by one hanger pin, and the number of parts can be reduced. In addition, since the pad spring is fitted to the bridge, the pad spring mounting state is stable, and the friction pad can be reliably prevented from rattling and the pad spring can be prevented from falling off when replacing the friction pad. Further, maintenance can be improved. Furthermore, the pad spring only needs to have a length dimension that can be arranged in approximately half of the outer side in the radial direction of the disk that becomes the disk insertion side when the friction pad moves forward. Thus, the cost can be reduced and the weight can be reduced.

  In addition, an engagement surface is formed in the vicinity of the housing recess of the bridge portion, and the pad spring fitting portion is fitted between the engagement surface and the housing recess, so that the pad spring has a simple structure. Can be securely fitted to the bridge portion. Furthermore, a convex bent portion that is bent along the inner surface of the housing recess in the radial direction of the disk, and a first pressing portion that elastically contacts the disk insertion side surface of the hanging piece at the tip side of the convex bent portion, Since the friction pad is pressed to the disk delivery side, the friction pad can be reliably pressed to the disk delivery side with a simple structure, and the friction pad is held by the slide pin at the center of the friction pad. By merely elastically contacting the second pressing portion with the end portion on the disk insertion side, it is possible to prevent the friction pad from being lifted and to effectively suppress the play of the friction pad.

  Furthermore, if the first clamping piece is engaged with the protrusion protruding from the engagement surface, the pad spring can be reliably prevented from coming off and displaced.

  Further, the hanger pin is provided with an annular groove, and the pad spring is provided with a hanger pin support piece that elastically contacts the inner surface of the annular groove in the radial direction of the disk.

  1 to 6 are views showing one embodiment of a vehicle disc brake according to the present invention. FIG. 1 is a sectional front view of an essential part of the vehicle disc brake. FIG. 2 is a sectional view taken along line II-II in FIG. 5 is a cross-sectional view taken along line III-III in FIG. 5, FIG. 4 is a perspective view of the pad spring, FIG. 5 is a front view of a vehicle disc brake showing an embodiment of the present invention, and FIG. is there. The arrow A is the direction of rotation of the disk rotor that rotates integrally with the wheel when the vehicle moves forward, and the disk delivery side and the disk entry side described below are those when the vehicle moves forward.

  A disc brake 1 shown in this embodiment is disposed on a disc rotor 2 that rotates integrally with a wheel, a caliper body 3 that is attached to a vehicle body at one side of the disc rotor 2, and both sides of the disc rotor 2. Between the action portions 3a and 3b of the caliper body 3, there are provided friction pads 4 and 4 that are arranged to face each other with the disc rotor 2 interposed therebetween, and a pad spring 5 that elastically contacts the friction pad.

  The caliper body 3 is a monocoque in which a pair of action portions 3a and 3b are integrally connected to each other by a disc feed-in side and a feed-out bridge portion 3d and 3e straddling the outer peripheral side of the disc rotor 2, and a bridge portion 3c at the center portion. It is formed in a 4-pot piston facing type with a structure. Two cylinder holes 6 are formed in the action portions 3a and 3b so as to face each other, and torque receiving portions 3f and 3g are provided on the disk insertion side and the rotation side, respectively. Further, the braking heat generated by the sliding contact between the disk rotor 2 and the friction pad 4 is released to the outside between the disk entrance side and the delivery side bridge portions 3d and 3e and the central bridge portion 3c. In addition, ceiling openings 3h and 3i for visually confirming the wear state of the friction pad 4 from the outside of the caliper body 3 are formed. Each cylinder hole 6 accommodates a piston 7 so as to be movable in the axial direction, and a hydraulic chamber 8 is defined between the cylinder hole 6 and the piston 7. On the disk delivery side of the caliper body 3, there are provided union holes 9 for supplying the hydraulic fluid to the hydraulic chambers 8 and a bleeder 10 for removing the air in the hydraulic fluid.

  A ridge portion 3j is provided on the outer side in the disk radial direction of the action portions 3a and 3b and the central bridge portion 3c, and a large-diameter female screw to which a hanger pin 11 is attached is provided on one action portion 3a side of the ridge portion 3j. A hole 3k and a small-diameter pin hole 3m are formed in the disk axial direction, and a pin insertion hole 3n corresponding to the pin hole 3m is formed in the disk axial direction on the other action part 3b side of the raised portion 3j. . A receiving recess 3p for receiving the suspension piece 4c of the friction pad 4 is provided on the inner surface in the disk radial direction of the central bridge portion 3c, and a pad spring 5 is provided on the disk delivery side of the receiving recess 3p. The engaging surface 3q is formed. Further, a protrusion 3r is formed on the inner side of the engagement surface 3q in the disk radial direction so as to protrude toward the disk delivery side.

  Each friction pad 4 is disposed between the torque receiving portion 3f on the disk feeding side and the torque receiving portion 3g on the disk feeding side, and has a lining 4a slidably contacting the side surface of the disk rotor 2, and the lining 4a is attached to the friction pad 4. And a metal back plate 4b. In the back plate 4b, the suspension piece 4c is formed at the center of the outer surface in the radial direction of the disk, and the protrusions 4d and 4d are formed at the disk entry side end and the delivery side end, respectively. The hanger pin 11 is formed with an insertion hole 4e. The hanger pin 11 includes a shaft portion 11a and a large-diameter male screw portion 11b provided integrally with a base end portion of the shaft portion 11a, and an annular groove 11c is formed at an intermediate portion in the axial direction of the shaft portion 11a.

  The pad spring 5 is elastically contacted with the fitting portion 5a fitted to the inner surface in the disk radial direction of the central bridge portion 3c and the disk insertion side surface of the hanging piece 4c of the friction pad 4 so that each friction pad 4 is brought into contact. A pair of first pressing pieces 5b, 5b that press toward the disk delivery side, and the protrusion 4d at the disk entry side end of each friction pad 4 elastically contact the disk entry side of the friction pad 4 to the disk radius. A pair of second pressing pieces 5c, 5c that press inward in the direction, and a hanger pin support piece 5d that elastically contacts the inner surface in the disk radial direction of the annular groove 11c of the hanger pin 11 and supports the hanger pin 11 are provided. . The fitting portion 5a is provided at the both ends of the flat portion 5e, which is in contact with the inner surface in the disk radial direction of the bridge portion 3c between the engagement surface 3q and the receiving recess 3p, It is formed by a first sandwiching piece 5f on the engagement surface side that sandwiches the bridge portion 3c between the engagement surface 3q and the housing recess 3p and a second sandwiching piece 5g on the housing recess side. The first pressing piece 5b is continuous with the second sandwiching piece 5g and is bent along the inner surface of the housing recess 3p, and the hanging piece 4c at the tip side of the protruding bending part 5h. And a first pressing portion 5i that is in elastic contact with the disk insertion side. The second pressing piece 5c includes a spring piece 5j extending to the disk insertion side along the disk radial direction outer side surface of the friction pad 4 continuously to the convex bent part 5h, and a tip part of the spring piece 5j. And a second pressing portion 5k that elastically contacts the protrusion 4d at the end of the friction pad 4 on the disk insertion side. The hanger pin support piece 5d protrudes from an intermediate position between the pair of first pressing pieces 5b and 5b of the fitting portion 5a, and elastically contacts the inner surface of the annular groove 11c of the hanger pin 11 in the disk radial direction at the tip. A semicircular receiving piece 5m is provided.

  The friction pads 4 and 4 and the pad spring 5 are assembled by first inserting the convex bent portion 5h of the pad spring 5 into the housing recess 3p of the bridge portion 3c, and inserting the first clamping piece 5f into the protrusion of the engaging surface 3q. 3r, the second holding piece 5g is engaged with the receiving recess 3p, and the fitting portion 5a is fitted to the inner surface in the disc radial direction of the central bridge portion 3c, and the pad spring 5 is fixed to the bridge portion 3c. To do. Further, the suspension piece 4c of each friction pad 4 is disposed on the disk rotor side of the convex bent portion 5h of the pad spring 5 in the housing recess 3p. Next, the tip of the shaft portion of the hanger pin 11 is inserted into the pin hole 3m from the female screw hole 3k, and the shaft portion 11a is suspended in the housing recess 3p of the bridge portion 3c, and the suspension piece of each friction pad 4 housed in the housing recess 3p. After sequentially inserting the friction pads 4 and 4 on both sides of the disk rotor 2 through the insertion holes 4e of 4c, the distal end side of the shaft portion 11a is further inserted into the pin insertion holes 3n, and the large-diameter male screw portion 11b is screwed into the female screw hole 3k. By this assembly, the first pressing portions 5i of the pad springs 5 are brought into elastic contact with the disk insertion side surfaces of the suspension pieces 4c of the friction pads 4, and the protrusions 4d at the end of the friction pad 4 on the disk insertion side. The second pressing portions 5k are in elastic contact with each other, and the receiving piece 5m of the hanger pin support piece 5d is in elastic contact with the inner surface in the disk radial direction of the annular groove 11c of the hanger pin 11.

  In the above-described disc brake 1, the friction pad 4 is always in a state where the disc feeding side surface of the back plate 4b is pressed against the torque receiving portion 3g by the first pressing piece 5b of the pad spring 5. There is no backlash. When the braking operation is performed, the pressurized hydraulic fluid is supplied from the union hole 9 to the four hydraulic pressure chambers 8, and the piston 7 moves forward through the cylinder hole 6 to push both friction pads 4 to the disk rotor side. The lining 4a is braked by being brought into sliding contact with both side surfaces of the disk rotor 2. At this time, the friction pad 4 is dragged by the disk rotor 2 and the disk feeding side surface of the back plate 4b is pressed against the torque receiving portion 3g, and the disk feeding side tends to float up due to the rotational moment. Since the protrusion 4d formed at the end is in elastic contact with the second pressing portion 5k, this lifting can be suppressed. Further, since the second pressing portion 5k is held in contact with the protrusion 4d by the spring piece 5j, the friction pad 4 is prevented from rattling and the brake squeal and uneven wear of the friction pad 4 are prevented. can do. Even if the behavior of the second pressing portion 5k and the spring piece 5j is transmitted to the fitting portion 5a, the first clamping piece 5f is engaged with the protrusion 3r of the engaging surface 3q. It is possible to reliably prevent disconnection and displacement. Furthermore, since the receiving piece 5m of the hanger pin 5 elastically contacts the inner surface of the annular groove 11c of the hanger pin 11 in the disk radial direction, the hanger pin 11 can be prevented from coming off.

  Thus, in this embodiment, the friction pads 4 and 4 can be suspended by the single hanger pin 11, and the number of parts can be reduced. In addition, since the pad spring 5 is fitted to the central bridge portion 3c, the mounting state of the pad spring 5 is stabilized, and rattling and lifting of the friction pad 4 can be reliably suppressed. Further, since the fitting portion 5a of the pad spring 5 is fitted between the engagement surface 3q of the bridge portion 3c and the housing recess 3p, the pad spring 5 can be securely attached to the bridge portion 3c with a simple structure. Since the pad spring 5 is not dropped off even when the friction pad is exchanged, the maintainability can be improved. Furthermore, the pad spring 5 only needs to have a length dimension from the engagement surface 3q of the bridge portion 3c to the protrusion 4d on the disk insertion side of the friction pad 4, so that the pad spring 5 is formed smaller than the conventional pad spring. It is possible to reduce the cost and weight.

  Note that the present invention is not limited to the monocoque four-pot piston-facing caliper body as in the above-described embodiment, but can also be applied to the split-type facing caliper body, and the number of pistons is also limited. Is optional.

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

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... Disc brake, 2 ... Disc rotor, 3 ... Caliper body, 3a, 3b ... Action part, 3c, 3d, 3e ... Bridge part, 3f, 3g ... Torque receiving part, 3h, 3i ... Ceiling opening part, 3j ... Rise 3k ... female screw hole, 3m ... pin hole, 3n ... pin insertion hole, 3p ... receiving recess, 3q ... engagement surface, 3r ... projection, 4 ... friction pad, 4a ... lining, 4b ... back plate, 4c ... Hanging piece, 4d ... Projection, 4e ... Insertion hole, 5 ... Pad spring, 5a ... Fitting part, 5b ... First pressing piece, 5c ... Second pressing piece, 5d ... Hanger pin support piece, 5e ... Plane Part, 5f ... first clamping piece, 5g ... second clamping piece, 5h ... convex bent part, 5i ... first pressing part, 5j ... spring piece, 5k ... second pressing part, 5m ... receiving piece, 6 ... Cylinder hole, 7 ... piston, 8 ... hydraulic chamber, 9 ... union hole, 10 ... breeder 11 ... Hanger pin, 11a ... shaft portion, 11b ... large 径雄 threaded portion, 11c ... annular groove

Claims (4)

A caliper body in which a pair of operating portions arranged opposite to each other with the disc rotor interposed therebetween is connected by a bridge portion straddling the outer periphery of the disc rotor, and a torque receiving portion on the disc insertion side and a torque receiving portion on the disc outlet side when the vehicle moves forward. A pair of friction pads are arranged between the two parts, a suspension piece is projected from each friction pad, and a hanger pin suspended across the disk rotor on the caliper body in the disk axial direction is used as the suspension piece. In the vehicle disc brake that is inserted and suspended so that the pair of friction pads can be moved in the disc axial direction, and a pad spring that elastically contacts the pair of friction pads is disposed, the friction pads are arranged on the outer surface in the disc radial direction. Hanging pieces are respectively provided on the hanging pieces, and one hanger pin is inserted through the hanging pieces, and on the inner surface in the disk radial direction of the bridge portion, Storage recesses for receiving the respective suspension pieces are provided, and the pad springs are elastically attached to the inner side surface of the bridge portion in the disk radial direction and to the disk insertion side surface of the suspension piece. A pair of first pressing pieces that contact and press each friction pad to the disk delivery side, and elastically contact the disk entry side of the disk radial direction outer surface of each friction pad, and the disk entry side of the friction pad is the disk radius A vehicular disc brake comprising a pair of second pressing pieces that press inward in the direction. The caliper body has an engagement surface of the pad spring formed on the disk delivery side of the bridge portion, and the pad spring fitting portion has a disk radius between the engagement surface of the bridge portion and the housing recess. A flat portion arranged on the inner side surface in the direction, and a first holding piece and a receiving concave portion side on the engaging surface side which are provided at both ends of the flat portion and hold the bridge portion between the engaging surface and the receiving concave portion The first pressing piece is a convex bent portion that is continuous with the second holding piece and is bent along the inner surface of the receiving recess, and the convex bent portion A first pressing portion that elastically contacts a disk insertion side surface of the suspension piece on the distal end side, and the second pressing piece extends from the distal end portion of the convex bent portion to the outer surface in the disk radial direction of the friction pad. Spring pieces extending along the disk entry side, and the spring pieces The vehicle disk brake according to claim 1, characterized in that a second pressing portion elastically contacting the disk rotation entrance side end portion of the friction pad at the tip of the ring segments. 3. The vehicle disc brake according to claim 2, wherein a protrusion projecting toward the disk delivery side is formed on the engagement surface, and the first clamping piece is engaged with the protrusion. The hanger pin includes an annular groove in an axially intermediate portion, and the pad spring includes a hanger pin support piece that elastically contacts the inner surface in the disk radial direction of the annular groove and supports the hanger pin from the inner side in the disk radial direction. The vehicle disc brake according to any one of claims 1 to 3, wherein the vehicle disc brake is provided.

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