Vehicle disc brake

Abstract

To provide a vehicle disc brake which achieves improvement of assemblability of a pad spring.SOLUTION: In a caliper body, an engagement groove 3p which engages with a pad spring 5 is formed at a disc radial inner side of a disc turn-in side surface at the time of forward movement of a vehicle of a ceiling opening 3f. The pad spring 5 includes: a curved piece 5a which contacts with the disc radial inner side of a hanger pin 13 hanging a friction pad 4; a turn-in side pad resilient part 5b which extends from the curved piece 5a to the disc turn-in side at the time of forward movement of the vehicle and presses the friction pad 4 to the disc radial inner side; a turn-in side pad resilient part 5c which extends from the curved piece 5a to the disc turn-in side at the time of forward movement of the vehicle and presses the friction pad 4 to the disc radial inner side; and an engagement piece 5d which is provided at a tip of the turn-in side pad resilient part 5b and engaged with the engagement groove 3p.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to a vehicle disc brake used in moving vehicles such as automobiles and motorcycles, and more particularly to a vehicle disc brake in which a pad spring is used to suppress rattling of a friction pad suspended by a single hanger pin on both sides of a disc rotor. [Background technology]

[0002] Conventionally, a vehicle disc brake equipped with friction pads suspended by a single hanger pin on both sides of a disc rotor has a ceiling opening provided in a bridge portion of a caliper body for inserting and removing the friction pad, and a hanger pin suspended in the disc axial direction through the ceiling opening has a hanging piece protruding from the center of the friction pad in the disc circumferential direction inserted therein, suspending the friction pad movably in the disc axial direction, and a pad spring that suppresses rattle of the friction pad is attached between the back plate of the friction pad, the bridge portion, and the hanger pin (see, for example, Patent Document 1). [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Patent No. 3729583 Summary of the Invention [Problem to be solved by the invention]

[0004] However, the pad spring in the above-mentioned Patent Document 1 is assembled by sandwiching the hanger pin between the curved piece that abuts the radially inner surface of the hanger pin and the cover piece that covers the radially outer surface of the hanging piece of the friction pad, making assembly of the pad spring time-consuming.

[0005] SUMMARY OF THE PRESENT EMBODIMENTS The present invention has an object to provide a disc brake for a vehicle which improves the ease of assembly of a pad spring. [Means for solving the problem]

[0006] In order to achieve the above object, a vehicle disc brake of the present invention comprises a caliper body arranged across a disc rotor, a pair of friction pads arranged on both sides of the disc rotor, and a pad spring that biases the friction pads radially inwardly of the disc, the caliper body having a bridge portion that straddles the outer periphery of the disc rotor, a ceiling opening through which the friction pads are inserted and removed, the friction pads having a hanging piece protruding from a center portion in the disc circumferential direction, and a hanger pin that suspends the ceiling opening in the disc axial direction is inserted into the hanging piece, whereby the friction pads are suspended movably in the disc axial direction. The caliper body has an engagement groove for engaging the pad spring on the radially inner side of the disc entry side wall of the ceiling opening when the vehicle moves forward, and the pad spring has a curved piece that abuts the radially inner side of the hanger pin, a rotation-in side pad resilient portion that extends from the curved piece to the disc entry side when the vehicle moves forward and presses the friction pad radially inward in the disc direction, a rotation-out side pad resilient portion that extends from the curved piece to the disc exit side when the vehicle moves forward and presses the friction pad radially inward in the disc direction, and a engagement piece that is provided at a tip of the rotation-in side pad resilient portion and is engaged with the engagement groove.

[0007] In addition, it is preferable that the rotation-side pad resilient portion is formed in a curved shape that is convex toward the friction pad side, and is provided with a rotation-side abutment piece at an intermediate portion, the abutment piece having a length capable of abutting against the radially outer surfaces of both of the friction pads, and the locking piece is formed at an incline radially outward of the disk.

[0008] Furthermore, it is preferable that the friction pad is provided with a protrusion that protrudes radially outward in the disc direction, at least on the disc rotation side of the radially outer surface of the disc when the vehicle is moving forward, and the rotation side pad resilient portion is formed in a curved shape that is convex toward the friction pad side, and is provided with an rotation side abutment piece at its tip that abuts against the disc rotation side of the protrusion, and the rotation side abutment piece has a length that allows it to abut against the disc rotation side of the protrusions of both of the friction pads, and has a protruding piece at its tip that protrudes radially outward in the disc direction.

[0009] In addition, the rotation-side pad resilient portion is provided with a rotation-side abutment piece in an intermediate portion thereof that abuts against the radially outer surface of the friction pad, and is provided with a rotation-side first inclined piece that gradually inclines inward in the radial direction of the disk from the curved piece toward the rotation-side abutment piece, and a rotation-side second inclined piece that gradually inclines inward in the radial direction of the disk from the rotation-side abutment piece toward the locking piece at a gentler inclination angle than the rotation-side first inclined piece, and the rotation-side abutment piece has a length capable of abutting against the radially outer surfaces of both of the friction pads, and is formed so as to gradually incline inward in the radial direction of the disk toward the widthwise center, and the locking piece is formed so as to incline outward in the radial direction of the disk.

[0010] Furthermore, the friction pad is provided with a protrusion that protrudes radially outward on the disc rotation side of the radially outer surface of the disc at least when the vehicle is moving forward, and the rotation side pad resilient portion is provided with a rotation side abutment piece at its tip that abuts against the disc rotation side of the protrusion, and is provided with a rotation side first inclined piece on the curved side that gradually slopes inward in the disc radial direction toward the tip side, and a rotation side second inclined piece that gradually slopes inward in the disc radial direction from the tip of the rotation side first inclined piece toward the rotation side abutment piece at a gentler inclination angle than the rotation side first inclined piece, and the rotation side abutment piece has a length that can abut against the disc rotation side of the protrusions of both of the friction pads, and is provided with a protruding piece at its tip that protrudes radially outward in the disc radial direction.

[0011] It is also preferable that the curved piece has an end on the disk outlet side disposed radially outward of an end on the disk inlet side.

[0012] Furthermore, it is preferable that the curved piece has a flat portion at the end on the disc rotation side, the flat portion extending toward the disc rotation side.

[0013] It is also preferable to provide an index indicating the attachment direction on either the inlet pad resilience portion or the outlet pad resilience portion. Effect of the Invention

[0014] According to the vehicle disc brake of the present invention, the pad spring can be easily assembled to the caliper body by abutting the curved piece against the radially inner side of the hanger pin and engaging the locking piece with the locking groove of the caliper body. This assembly allows the in-side pad resilient portion and the out-side pad resilient portion to press the friction pad radially inward, suppressing rattling of the friction pad.

[0015] In addition, the rotation-in side pad resilient portion is formed in a curved shape that is convex toward the friction pad side, and is provided with a rotation-in side abutment piece at its middle portion that has a length that allows it to abut against the radially outer surfaces of both friction pads, and the locking piece is formed to be inclined radially outward, thereby pressing the friction pad against the radially inner side of the disk and the disk rotation-out side, and effectively suppressing wobbling of the friction pad. Furthermore, by inclining the locking piece radially outward, the pad spring can be securely locked to the caliper body. In addition, by forming the rotation-in side pad resilient portion in a curved shape, it is possible to easily form a rotation-in side pad resilient portion that has a resilient force.

[0016] Furthermore, the friction pad has a protrusion protruding outward in the radial direction of the disk at least on the disk rotation side of the radial outer surface of the disk when the vehicle is moving forward, and the rotation side pad resilience portion is formed in a curved shape that is convex toward the friction pad side, and has a rotation side abutment piece at its tip that abuts against the disk rotation side of the protrusion, and the rotation side abutment piece has a length that can abut against the disk rotation side of the protrusion of both friction pads, and has a protrusion piece at its tip that protrudes outward in the radial direction of the disk, so that the rotation side pad resilience portion urges the friction pad toward the disk rotation side and the disk radial inward. By urging the friction pad toward the disk rotation side, the friction pad is in a state in which it is in contact with the torque receiving surface provided on the caliper body in advance, and it is possible to prevent abutment noise generated by the friction pad and the torque receiving surface coming into contact with each other. In addition, by urging the friction pad toward the radial inward direction of the disk, it is possible to suppress rattling of the friction pad. Furthermore, by forming the resilient portion of the rotation-side pad in a curved shape, it is possible to easily form the resilient portion of the rotation-side pad having a resilient force.

[0017] In addition, the resilient portion of the pad on the rotating side has a contact piece at the middle portion that contacts the outer surface of the friction pad in the radial direction of the disk, a first inclined piece that gradually inclines inward in the radial direction of the disk from the curved piece toward the contact piece on the rotating side, and a second inclined piece that gradually inclines inward in the radial direction of the disk from the contact piece on the rotating side toward the locking piece at a gentler angle than the first inclined piece on the rotating side, the contact piece on the rotating side has a length that allows it to contact the outer surfaces of the disk in the radial direction of both friction pads, and is formed to gradually incline inward in the radial direction of the disk toward the center in the width direction, and the locking piece is formed to incline outward in the radial direction of the disk, so that the friction pad is pressed toward the inner side in the radial direction of the disk and toward the rotating side of the disk, and the rattle of the friction pad can be effectively suppressed. Furthermore, by inclining the locking piece outward in the radial direction of the disk, the pad spring can be securely locked to the caliper body. In addition, by changing the inclination angle and length of the first inclined piece on the rotation-inlet side and the second inclined piece on the rotation-inlet side, the elastic force can be easily set or changed.

[0018] Furthermore, the friction pad is provided with a protrusion that protrudes radially outward on the disc rotation side of the disc radially outer surface at least when the vehicle is moving forward, and the rotation-side pad resilient portion is provided with a rotation-side abutment piece at its tip that abuts against the disc rotation-in side of the protrusion, and is provided with a rotation-side first inclined piece on the curved side that gradually slopes inward in the disc radially toward the tip side, and a rotation-side second inclined piece that slopes gradually inward in the disc radially from the tip of the rotation-side first inclined piece toward the rotation-side abutment piece at a gentler inclination angle than the rotation-side first inclined piece, and the rotation-side abutment piece has a length that allows it to abut against the disc rotation-in sides of the protrusions of both friction pads, and is provided with a protruding piece at its tip that protrudes radially outward in the disc radially.As a result, the friction pad is in advance in contact with the torque receiving surface provided on the caliper body, and abutment noise generated by the friction pad and the torque receiving surface coming into contact can be prevented. In addition, by biasing the friction pads radially inward, it is possible to suppress rattling of the friction pads. Also, by changing the inclination angle and length of the first inclined piece on the rotating exit side and the second inclined piece on the rotating exit side, it is easy to set or change the setting of the elastic force.

[0019] Furthermore, the friction pad is provided with a protrusion that protrudes outward in the radial direction of the disk, and the rotation-out side pad resilient portion is provided with a rotation-out side abutment piece that abuts against the disk rotation-in side of the protrusion, so that the rotation-out side pad resilient portion urges the friction pad toward the disk rotation side and toward the inside in the radial direction of the disk. By urging the friction pad toward the disk rotation side, the friction pad is in advance in contact with the torque receiving surface provided on the caliper body, and it is possible to prevent abutment noise generated by the friction pad and the torque receiving surface abutting against each other. Furthermore, by urging the friction pad toward the inside in the radial direction of the disk, it is possible to suppress rattling of the friction pad.

[0020] Furthermore, by positioning the end of the curved piece on the disk outlet side radially outward from the end of the disk inlet side, it is possible to shift the radial positions of the end of the curved piece on the disk inlet side, which is subjected to stress during assembly, from the end of the curved piece on the disk outlet side, which is subjected to stress during vehicle vibration and braking, thereby improving durability.

[0021] In addition, by providing a flat portion extending toward the disc rotation side at the end of the curved piece on the disc rotation side, it is possible to prevent the stress generated on the disc rotation side rather than the curved piece of the pad spring from being concentrated on the curved piece, thereby improving the durability of the pad spring.

[0022] Furthermore, by providing an index indicating the mounting direction on either the inlet pad resilient portion or the outlet pad resilient portion, incorrect assembly of the pad spring can be prevented. [Brief description of the drawings]

[0023] [Figure 1] 1 is a front view of a vehicle disc brake showing one embodiment of the present invention; [Diagram 2] FIG. [Diagram 3] FIG. 3 is a cross-sectional view taken along line III-III of FIG. [Figure 4] FIG. 4 is a cross-sectional view taken along line IV-IV of FIG. [Diagram 5] 1 is a perspective view of a pad spring showing an example of the present invention; DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0024] 1 to 5 are diagrams showing an example of a vehicle disc brake according to the present invention. Note that arrow A indicates the rotation direction of a disc rotor that rotates together with the wheel when the vehicle moves forward, and the disc rotation outward and inward sides described below are those when the vehicle moves forward.

[0025] The vehicle disc brake 1 of this embodiment comprises a disc rotor 2 that rotates integrally with a wheel (not shown), a caliper body 3 that is attached to the vehicle body on one side of the disc rotor 2, a pair of friction pads 4,4 arranged opposite each other between the operating parts 3a,3a of the caliper body 3 with the disc rotor 2 in between, and a pad spring 5 that suppresses rattling of the friction pads 4,4.

[0026] The caliper body 3 is formed by integrally connecting a pair of caliper halves 3c, 3c divided at the middle of the bridge portion 3b with connecting bolts 6, 6. The bridge portion 3b is provided with a disc rotation-side bridge portion 3d, a disc rotation-side bridge portion 3e, and a ceiling opening 3f provided between the disc rotation-side bridge portion 3d and the disc rotation-side bridge portion 3e for inserting and removing the friction pads 4, 4. The action portions 3a, 3a are formed with two cylinder holes 7 facing each other, each opening on the disc rotor side, and a piston 8 is housed in each cylinder hole 7 via a piston seal 9, and a hydraulic chamber 10 to which hydraulic fluid is supplied is defined between the bottom of each cylinder hole 7 and each piston 8.

[0027] The disk-in and disk-out sides of one of the action parts 3a are provided with mounting bosses 3g, 3g in the disk radial direction, and each mounting boss 3g is provided with a mounting bolt insertion hole 3h in the disk radial direction, and the caliper body 3 is attached to the vehicle body by screwing a mounting bolt (not shown) inserted into the mounting bolt insertion hole 3h into a caliper mounting part provided on the vehicle body side. The disk-out side bridge part 3e is provided with a union hole 11 for introducing hydraulic fluid into the hydraulic chambers 10, 10, and a bleeder screw 12 for discharging air mixed in the hydraulic fluid.

[0028] Each of the action parts 3a, 3a has a friction pad accommodating part 3i, 3i for accommodating the friction pad 4, 4. Each of the friction pad accommodating parts 3i has a rotation-in side torque receiving surface 3k formed radially inward of the disk rotation-in side surface 3j of the ceiling opening 3f, and a rotation-out side torque receiving surface 3n formed radially inward of the disk rotation-out side surface 3m of the ceiling opening 3f. Furthermore, a locking groove 3p for locking the pad spring 5 is formed on the radially inner side of the disk axial center of the disk rotation-in side bridge part 3d. Furthermore, on the radially outer side of each of the action parts 3a, 3a and in the center of the disk rotation direction, raised parts 3q, 3q for mounting the hanger pin 13 are formed across the ceiling opening 3f.

[0029] The friction pads 4, 4 are composed of a lining 4a that comes into sliding contact with the side surface of the disc rotor 2, and a back plate 4b that is held on the caliper body 3 via one hanger pin 13. The main body 4c of the back plate 4b to which the lining 4a is attached is formed to be slightly narrower than the distance between the inlet torque receiving surface 3k and the outlet torque receiving surface 3n, and the radially outer surface 4d of the disc has a hanging piece 4f with a pin hole 4e in the center, and protrusions 4g, 4g that protrude radially outward from both sides in the disc rotation direction.

[0030] The friction pad 4 inserted from the ceiling opening 3f has the back plate body 4c accommodated in the friction pad accommodation portion 3i, and the hanger pin 13 installed in the disk axial direction on the raised portions 3q, 3q of the action portions 3a, 3a through the ceiling opening 3f is inserted into the pin hole 4e of the hanging piece 4f, so that the friction pad 4 is suspended movably in the disk axial direction. Furthermore, the pad spring 5 is engaged across the back plate 4b, the disk entrance side bridge portion 3d, and the hanger pin 13.

[0031] The pad spring 5 comprises a curved piece 5a that abuts the radially inner side of the hanger pin 13, a rotation-in side pad resilient portion 5b that extends from the curved piece 5a to the disk rotation-in side and presses the friction pads 4,4 radially inwardly on the disk, a rotation-out side pad resilient portion 5c that extends from the curved piece 5a to the disk rotation-out side and presses the friction pads 4,4 radially inwardly on the disk and to the disk rotation-out side, and a locking piece 5d that is provided at the tip of the rotation-in side pad resilient portion 5b and is engaged with the locking groove 3p.

[0032] The turn-in side pad resilient part 5b has a turn-in side abutment piece 5e in the middle part, which abuts against the radially outer side surface of the friction pad 4, 4, and a turn-in side first inclined piece 5f which gradually inclines inward in the radial direction of the disk from the curved piece 5a toward the turn-in side abutment piece 5e, and a turn-in side second inclined piece 5g which gradually inclines inward in the radial direction of the disk from the turn-in side abutment piece 5e toward the locking piece 5d at a gentler inclination angle than the turn-in side first inclined piece 5f. The turn-in side abutment piece 5e has a length capable of abutting against the radially outer side surfaces 4d, 4d of both friction pads 4, 4, and is formed so as to gradually incline inward in the radial direction of the disk toward the widthwise center. The locking piece 5d is formed so as to incline outward in the radial direction of the disk.

[0033] The resilient portion 5c of the rotating-out side pad has a contact piece 5h at its tip that contacts the disk rotation-in side 4h, 4h of the protrusions 4g, 4g on the disk rotation-out side provided on the friction pad 4, 4, and has a first inclined piece 5i that gradually inclines inward in the radial direction of the disk from the curved piece 5a side toward the tip side, and a second inclined piece 5j that gradually inclines inward in the radial direction of the disk from the tip of the first inclined piece 5i toward the rotating-out side contact piece 5h at a gentler angle than the first inclined piece 5i. In addition, an index 5k that protrudes in the width direction is provided at the middle part of the contact piece 5h of the rotating-out side. The contact piece 5h of the rotating-out side has a length that can contact the disk rotation-in side 4h, 4h of the protrusions 4g, 4g of both friction pads 4, 4, and has a protruding piece 5m at its tip that protrudes outward in the radial direction of the disk.

[0034] The curved piece 5a has an end 5n on the disk outlet side disposed radially outward of an end 5p on the disk inlet side. Furthermore, the curved piece 5a has a flat portion 5q at the end on the disk outlet side that extends toward the disk outlet side.

[0035] The pad spring 5 formed as described above is inserted into the caliper body 3 from the ceiling opening 3f, the locking piece 5d is locked in the locking groove 3p formed in the caliper body 3, and then, while applying a load to the pad spring 5, the hanger pin 13 is inserted through the pin holes formed in the raised portions 3q, 3q of the caliper body 3 and the pin hole 4e formed in the hanging piece 4f of the friction pad 4, thereby easily attaching the pad spring 5 to the caliper body 3. In addition, by inclining the locking piece 5d outward in the disc radial direction, the pad spring 5 can be securely locked to the caliper body 3. Furthermore, with this assembly, the rotation-in side abutment piece 5e of the pad spring 5 abuts against the radially outer disk surfaces 4d, 4d of the back plates 4b, 4b, pressing the friction pads 4, 4 radially inwardly on the disk, while the rotation-out side abutment piece 5h abuts against the disk rotation-in side surfaces 4h, 4h of the protrusions 4g, 4g of the back plates 4b, 4b.

[0036] The rotation-in side abutment piece 5e of the rotation-in side pad resilient portion 5b abuts against the disk radial outer side surface 4d, 4d of the friction pad 4, 4, and urges the friction pad 4, 4 toward the disk rotation side and the disk radial inner side. In addition, the rotation-out side abutment piece 5h of the rotation-out side pad resilient portion 5c abuts against the disk rotation side surface 4h, 4h of the protrusion 4g, 4g, and urges the friction pad 4, 4 toward the disk rotation side and the disk radial inner side. In this way, by urging the friction pad 4, 4 toward the disk rotation side, the back plate 4b, 4b of the friction pad 4, 4 is in a state of abutting against the rotation-out side torque receiving surface 3n in advance, and the abutment sound generated by the abutment of the back plate 4b, 4b and the rotation-out side torque receiving surface 3n can be suppressed. Furthermore, by urging the friction pad 4, 4 toward the disk radial inner side, the rattling of the friction pad 4, 4 can be suppressed.

[0037] Furthermore, the curved piece 5a has an end 5n on the disk rotation exit side disposed radially outward of the end 5p on the disk rotation entry side, and the end 5n on the disk rotation entry side of the curved piece 5a, to which stress is applied during assembly, and the end 5p on the disk rotation exit side of the curved piece 5a, to which stress is applied during vehicle vibration and braking, can be shifted in the radial direction of the disk, improving the durability of the pad spring 5. Also, by providing a flat portion 5q extending to the disk rotation exit side at the end 5n on the disk rotation exit side of the curved piece 5a, it is possible to suppress the stress generated on the disk rotation exit side of the pad spring 5 from concentrating on the curved piece 5a rather than the curved piece 5a. Furthermore, by providing an indicator 5k indicating the mounting direction on the rotation exit side pad resilience portion 5c, it is possible to prevent the pad spring 5 from being misassembled. Furthermore, by changing the inclination angle and length of the rotation entry side first inclined piece, the rotation entry side second inclined piece, the rotation exit side first inclined piece, and the rotation exit side second inclined piece, it is possible to easily set or change the resilience.

[0038] The present invention is not limited to the above-mentioned embodiment, and the friction pad may have a protrusion only on the disk rotation exit side of the radially outer surface of the disk. The pad spring may have a curved piece whose end on the disk rotation exit side is not necessarily positioned radially outward of the end on the disk rotation entry side. Furthermore, the end of the curved piece on the disk rotation exit side may not have a flat surface extending to the disk rotation exit side. The pad spring may have an index on the pad spring entry side indicating the attachment direction, or may not have an index.

[0039] In addition, the pad spring's inlet side resilient portion and outlet side resilient portion may be formed in a curved shape that is convex toward the friction pad side. By forming the pad spring's inlet side resilient portion and outlet side resilient portion in a curved shape, it becomes easier to mold the pad spring. [Explanation of symbols]

[0040] 1...vehicle disc brake, 2...disc rotor, 3...caliper body, 3a...action portion, 3b...bridge portion, 3c...caliper half body, 3d...disc rotation-in side bridge portion, 3e...disc rotation-out side bridge portion, 3f...ceiling opening, 3g...mounting boss portion, 3h...mounting bolt insertion hole, 3i...friction pad accommodating portion, 3j...disc rotation-in side, 3k...rotation-in side torque receiving surface, 3m...disc rotation-out side, 3n...rotation-out side torque receiving surface, 3p...engagement groove, 3q...ridge portion, 4...friction pad, 4a...lining, 4b...back plate, 4c...main body portion, 4d...disc radially outer surface, 4e...pin hole, 4f...hanging piece, 4g...projection, 4h...disc rotation side, 5...pad spring, 5a...curved piece, 5b...rotation-in side pad spring portion, 5c...rotation-out side pad spring portion, 5d...locking piece, 5e...rotation-in side abutment piece, 5f...rotation-in side first inclined piece, 5g...rotation-in side second inclined piece, 5h...rotation-out side abutment piece, 5i...rotation-out side first inclined piece, 5j...rotation-out side second inclined piece, 5k...index, 5m...projection piece, 5n, 5p...end, 5q...flat portion, 6...connecting bolt, 7...cylinder hole, 8...piston, 9...piston seal, 10...hydraulic chamber, 11...union hole, 12...brewer screw, 13...hanger pin

Claims

1. A vehicle disc brake comprising: a caliper body arranged across a disc rotor; a pair of friction pads arranged on both sides of the disc rotor; and a pad spring for biasing the friction pads radially inwardly, the caliper body having a bridge section that straddles the outer periphery of the disc rotor, the bridge section having a ceiling opening through which the friction pads are inserted and removed, the friction pads having a hanging piece protruding from a central section in the disc circumferential direction, and a hanger pin that suspends the ceiling opening in the disc axial direction is inserted into the hanging piece, thereby suspending the friction pad axially and movably in the disc axial direction, the caliper body has a locking groove for locking the pad spring on a radially inner side of a side surface of the ceiling opening where the disc turns when the vehicle moves forward, The pad spring includes a curved piece that abuts against the radially inner side of the hanger pin, a rotation-in side pad resilience portion that extends from the curved piece to the disk rotation-in side when the vehicle moves forward and presses the friction pad radially inward, a rotation-out side pad resilience portion that extends from the curved piece to the disk rotation-out side when the vehicle moves forward and presses the friction pad radially inward, and a locking piece that is provided at the tip of the rotation-in side pad resilience portion and is locked in the locking groove. a rotation-side pad resilient portion formed in a curved shape that is convex toward the friction pad side, and provided with a rotation-side abutment piece at an intermediate portion having a length capable of abutting against the radially outer surfaces of both of the friction pads, and the locking piece is formed at an angle radially outwardly of the disc.

2. The friction pad is provided with a protrusion that protrudes outward in the radial direction of the disc on a disc rotation side of a radially outer surface of the disc at least when the vehicle is moving forward, The rotating-side pad resilience portion is formed in a curved shape that is convex toward the friction pad side, and is provided at its tip with a rotating-side abutment piece that abuts against the disk rotating-in side surface of the protrusion, 2. A disc brake for a vehicle as described in claim 1, characterized in that the rotation-side abutment piece has a length capable of abutting the disc rotation-in sides of the protrusions of both of the friction pads, and has a protruding piece at its tip that protrudes radially outward from the disc.

3. A vehicle disc brake comprising: a caliper body arranged across a disc rotor; a pair of friction pads arranged on both sides of the disc rotor; and a pad spring for biasing the friction pads radially inwardly, the caliper body having a bridge section that straddles the outer periphery of the disc rotor, the bridge section having a ceiling opening through which the friction pads are inserted and removed, the friction pads having a hanging piece protruding from a central section in the disc circumferential direction, and a hanger pin that suspends the ceiling opening in the disc axial direction is inserted into the hanging piece, thereby suspending the friction pad axially and movably in the disc axial direction, the caliper body has a locking groove for locking the pad spring on a radially inner side of a side surface of the ceiling opening where the disc turns when the vehicle moves forward, The pad spring includes a curved piece that abuts against the radially inner side of the hanger pin, a rotation-in side pad resilience portion that extends from the curved piece to the disk rotation-in side when the vehicle moves forward and presses the friction pad radially inward, a rotation-out side pad resilience portion that extends from the curved piece to the disk rotation-out side when the vehicle moves forward and presses the friction pad radially inward, and a locking piece that is provided at the tip of the rotation-in side pad resilience portion and is locked in the locking groove. a rotation-side pad resilient portion having a rotation-side abutment piece at an intermediate portion thereof which abuts against the radially outer surface of the friction pad, and a rotation-side first inclined piece which gradually slopes inward in the radial direction of the disc from the curved piece toward the rotation-side abutment piece, and a rotation-side second inclined piece which gradually slopes inward in the radial direction of the disc from the rotation-side abutment piece toward the locking piece at a gentler inclination angle than the rotation-side first inclined piece, wherein the rotation-side abutment piece has a length capable of abutting against the radially outer surfaces of both of the friction pads, and is formed so as to gradually slope inward in the radial direction of the disc toward the widthwise center, and the locking piece is formed so as to slope outward in the radial direction of the disc.

4. The friction pad is provided with a protrusion that protrudes outward in the radial direction of the disc on a disc rotation side of a radially outer surface of the disc at least when the vehicle is moving forward, A vehicle disc brake as described in any one of claims 1 to 3, characterized in that the rotation-side pad resilient portion has a rotation-side abutment piece at its tip that abuts against the disc rotation-in side of the protrusion, and has, on one curved side, a rotation-side first inclined piece that gradually inclines radially inwardly in the disc toward the tip side, and a rotation-side second inclined piece that gradually inclins radially inwardly in the disc from the tip of the rotation-side first inclined piece toward the rotation-side abutment piece at a gentler inclination angle than the rotation-side first inclined piece, and the rotation-side abutment piece has a length capable of abutting against the disc rotation-in sides of the protrusions of both friction pads, and has a protruding piece at its tip that protrudes radially outwardly in the disc.

5. 5. The vehicle disc brake according to claim 1, wherein the curved piece has an end portion on a disc outlet side disposed radially outward of an end portion on a disc inlet side.

6. 5. The vehicle disc brake according to claim 1, wherein the curved piece has a flat portion at an end on the disc rotation side, the flat portion extending toward the disc rotation side.

7. 7. The vehicle disc brake according to claim 1, wherein an index indicating an attachment direction is provided on either the inlet pad resilient portion or the outlet pad resilient portion.

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