JP2020003006A - Disc brake for vehicle - Google Patents

Abstract

To secure slidability of a friction pad, and to suppress clank sound.SOLUTION: In a pad guide groove 3d formed at a caliper bracket 3, an ear piece 6b of a friction pad 6 is supported via a pad retainer 10. At the friction pad 6, a pad pressing spring 11 for pressing the friction pad 6 to a disc turn-out side is mounted. At a caliper support arm 3a, a pad retainer mounting part 3i having a mounting surface 3h is formed. The pad retainer 10 includes: a retainer part 10a mounted on the pad guide groove 3d; and a mounting part 10b having an extension piece 10h extending from an end part outside of the disc radial direction of the retainer part 10a to the outside of the disc radial direction and an elastic contact piece 10i coming into elastic contact with the mounting surface 3h. At the extension piece 10h, a spring piece 10k is formed protruding to the pad retainer mounting part side and coming into elastic contact with the pad retainer mounting part 3i. The pad pressing spring 11 comes into contact with the pad retainer mounting part 3i via the extension piece 10h.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a disk brake for a vehicle, and more particularly, to a pad retainer for guiding the movement of a friction pad, and a pad pressing spring for pressing the friction pad to the disk feeding side to suppress generation of a crank sound as a tapping sound. The present invention relates to a vehicle disk brake having:

  Conventionally, in a vehicle disk brake, a pair of caliper support arms extending over the outer periphery of the disk rotor in the disk axis direction are extended on a caliper bracket fixed to the vehicle body, and the caliper support arm has a disk radial outer surface. A U-shaped pad guide groove having an inner surface in the disk radial direction and an opposing surface connecting the both side surfaces is provided to face each other, and ear pieces projecting from both sides of a friction pad arranged with the disk rotor interposed therebetween are provided. The friction pad is supported in the pad guide groove via the pad retainer, and the friction pad is slid well.The friction pad is brought into contact with the caliper support arm when the vehicle moves forward, and the friction pad is brought into contact with the caliper support arm. A pad pressure spring that presses is attached, and the friction pad collides with the torque receiving surface due to running vibration etc. Was something that suppresses the raw (e.g., see Patent Document 1.).

JP-A-2015-10624

  However, in the above-mentioned Patent Document 1, the U-shaped retainer portion of the pad retainer is mounted in the U-shaped pad guide groove, and the pad pressing spring is attached to the lug of the friction pad on the disk entry side. It is installed, the spring piece of the pad pressing spring elastically contacts the retainer part and presses the friction pad to the disc outlet side, but since the clearance is set between the retainer part and the pad guide groove, The retainer portion pressed by the spring piece may be deformed. When the retainer portion is deformed, the posture for holding the ear pieces is disturbed, and the holding state of the friction pad is deteriorated, so that there is a possibility that a crank sound or a brake squeal may be generated.

  Therefore, an object of the present invention is to provide a vehicle disk brake that suppresses generation of a crank sound that is a hitting sound due to collision between a friction pad and a caliper bracket, while ensuring good sliding properties of the friction pad. .

  In order to achieve the above object, a disc brake for a vehicle according to the present invention includes a caliper bracket fixed to a vehicle body, wherein a pair of caliper supporting arms extending across the outer periphery of a disc rotor in a disc axial direction are extended. A disk-shaped pad guide groove having a disk radial outer surface, a disk radial inner surface, and an opposing surface connecting the disk radial outer surface and the disk radial inner surface is provided to face each other, Ear pieces projecting from both sides of the friction pad disposed with the disk rotor interposed therebetween are supported in the pad guide grooves via pad retainers, respectively, and the friction pads are disposed on the disk reversing side when the vehicle advances. A vehicle disc provided with a pad pressing spring that abuts on the caliper support arm and presses the friction pad toward the disc outlet side. In the brake, the caliper supporting arm has a pad retainer mounting portion having a mounting surface parallel to the disk radial outer surface of the pad guide groove formed radially outward of the pad guide groove in the disk radial direction. Is a U-shaped retainer mounted in the pad guide groove, an extending piece extending radially outward from the radially outer end of the retainer, and an elastic contact elastically contacting the mounting surface. And a mounting portion having a piece, and a spring piece that protrudes toward the pad retainer mounting portion and resiliently contacts the pad retainer mounting portion is formed on the extended piece, and the pad pressing spring is configured to be the pad of the friction pad. It is attached to the disk radial direction outside of the ear piece, and abuts on the pad retainer attachment portion via the extension piece. .

  Further, the spring piece is formed by cutting out a part of the extension piece, and forming a base portion by folding a tip end of a strip piece integrated with the extension piece toward a pad retainer mounting portion side, and attaching the tip end to the pad retainer. It is preferable to make elastic contact with the mounting portion. Further, it is preferable that a spring load of the pad pressing spring is smaller than a spring load of the spring piece. Preferably, a spring load of the spring piece is smaller than a spring load of the elastic contact piece of the pad retainer.

  According to the vehicle disc brake of the present invention, since the load of the pad pressing spring is received by the pad retainer mounting portion of the caliper supporting arm via the extension piece of the pad retainer, the pad retainer disposed in the pad guide groove Is not affected by the pad pressing spring. As a result, the pad retainer holds the ear piece of the friction pad in a good condition, and presses the friction pad to the disc feeding side by the pad pressing spring while securing the lubrication of the ear piece, and the caliper supporting arm on the disc feeding side. To suppress generation of crank noise. In addition, by forming a spring piece projecting toward the pad retainer mounting portion on the extension piece and resiliently contacting the pad retainer mounting section, a clearance formed between the extension piece and the pad retainer mounting section is reduced by the spring piece. And the load of the pad pressing spring can be reliably received by the pad retainer mounting portion.

  Also, the spring piece is formed by cutting out a part of the extension piece, and folding the tip end of the strip piece integrated with the extension piece toward the pad retainer attachment part side, and forming the tip part on the pad retainer attachment part. By making elastic contact, a spring piece can be formed with a simple structure. Further, the tip retainer can be positioned by elastically contacting the pad retainer mounting portion, thereby restricting the movement of the pad retainer in the disk axial direction. Further, since the spring load of the pad pressing spring is made smaller than the spring load of the spring piece, it is possible to prevent the pad retainer from being deformed by the spring load of the pad pressing spring. Further, since the spring load of the spring piece is made smaller than the spring load of the elastic contact piece of the pad retainer, there is no possibility that the mounting portion of the pad retainer is displaced by the spring load of the spring piece.

It is a principal part rear view of the disk brake for vehicles which shows one form example of this invention. It is a principal part top view of the disc brake for vehicles similarly. It is a perspective view of a pad retainer similarly. It is a sectional view of a disk brake for vehicles similarly. BRIEF DESCRIPTION OF THE DRAWINGS It is a front view of the vehicle disc brake which shows one example of this invention. FIG. 3 is a rear view of the vehicle disk brake. FIG. 3 is a plan view of the vehicle disk brake. FIG. 8 is a sectional view taken along line VIII-VIII of FIG. 5.

  1 to 8 show an embodiment of a vehicle disk brake according to the present invention. An arrow A indicates a rotation direction of a disk rotor that rotates integrally with wheels when the vehicle moves forward. The disc entry side is the time when the vehicle is moving forward.

  The disc brake 1 for a vehicle includes a disc rotor 2 that rotates integrally with wheels, a caliper bracket 3 fixed to the vehicle body at one side of the disc rotor 2, and caliper support arms 3a, 3a of the caliper bracket 3. A caliper body 5 movably supported in the axial direction of the disc via a pair of slide pins 4, 4, and opposed to each other with the disc rotor 2 interposed between the action portion 5 a and the reaction portion 5 b of the caliper body 5. And a pair of friction pads 6, 6.

  The caliper body 5 includes the operating portion 5a and the reaction portion 5b disposed on both sides of the disk rotor 2, and a bridge portion 5c connecting these over the outer periphery of the disk rotor 2. The operating portion 5a includes: A cylinder hole 5d having an opening on the disk rotor 2 side is provided. The piston 7 is accommodated in the cylinder hole 5d, and the piston 7 moves in the cylinder hole 5d in the disk axial direction by the hydraulic pressure supplied to the hydraulic chamber 8 at the bottom of the cylinder hole. At the side of the action portion 5a, vehicle body mounting arms 5e, 5e protrude, and at the tip of each vehicle body mounting arm 5e, the slide pin 4 is protruded by a mounting bolt 9, respectively. Further, a reaction force claw 5f is formed in the reaction portion 5b.

  The caliper support arms 3a, 3a extend from both sides of the caliper bracket 3 across the outer periphery of the disk rotor 2 across both sides of the bridge portion 5c in the disk axial direction, and on the other side of the disk rotor 2, a side wall of the reaction portion 5b. Along the direction of the center of the disk, and the tip is connected by a tie rod 3b. Guide holes 3c for accommodating the slide pins 4 are formed in each caliper support arm 3a. Four caliper support arms 3a, 3a have four pad guide grooves facing each other on respective sides of the disk rotor 2. 3d is provided.

  Each pad guide groove 3d is formed in a U-shape having an outer surface 3e in the disk radial direction, an inner surface 3f in the disk radial direction, and an opposing surface 3g connecting these both side surfaces 3e, 3f. Ear pieces 6b projecting from both sides of the back plate 6a are supported by pad guide grooves 3d, 3d on the disk entrance side and the disk exit side via pad retainers 10, respectively. Pad retainer mounting portions 3i, 3i each having a mounting surface 3h in a direction parallel to the disk radial outer surface 3e are formed outside the pad guide grooves 3d, 3d in the disk radial direction, respectively. Further, a torque receiving surface which receives a braking torque from the friction pad 6 is provided radially inward of the disk guide groove 3d of each caliper support arm 3a in the disk radial direction and closer to the piston than the inner side surface 3j of the pad retainer mounting portion 3i. 3k are provided.

  The pad retainer 10 has a pair of retainer portions 10a, 10a laid in pad guide grooves 3d, 3d on both sides of the disk rotor on the disk entrance side or the disk exit side, and an attachment portion attached to the caliper support arms 3a, 3a. 10b, 10b, a connecting piece 10c connecting the pair of mounting portions 10b, 10b across the outer periphery of the disk rotor 2, and pad spring portions 10d, 10d extending radially inward of the retainer portions 10a, 10a in the disk brake direction. It has.

  Each retainer portion 10a has an inner piece 10e and an outer piece 10f facing inward and outward in the radial direction of the disc with the ear piece 6b of the friction pad 6 interposed therebetween, and a back side connecting these two pieces 10e and 10f at the back of the pad guide groove 3d. The mounting part 10b is connected to the outer piece 10f, and the pad spring part 10d is connected to the inner piece 10e.

  Each mounting portion 10b extends radially outward from the end of the outer piece 10f on the caliper body side in the radial direction of the disc, and has an extending piece 10h disposed inside the pad retainer mounting section 3i and an anti-caliper from the tip of the extending piece 10h. An elastic contact piece 10i extending to the body side and elastically contacting the mounting surface 3h of the pad retainer mounting part 3i, and the pad retainer mounting part 3i is sandwiched between the elastic contact piece 10i and the outer piece 10f to thereby provide a pad retainer. 10 is attached to the pad retainer attachment portion 3i. The extension piece 10h includes a spring piece 10k formed by cutting a part of the extension piece 10h and folding the tip end 10j of the strip piece integrated with the extension piece 10h toward the pad retainer mounting portion side. The folded front end portion 10j elastically contacts the inner surface 3j of the pad retainer mounting portion 3i.

  Each pad spring portion 10d includes a support piece 10m extending radially inward from the caliper body side end of the inner piece 10e, and a caliper body side that is gradually inclined outward from the tip of the support piece 10m in the disk radial direction. And a pad resilient piece 10n elastically contacting the inner surface 6d of the friction pad 6 in the disk radial direction.

  In addition, insertion guide pieces 10p are provided to open outward on the anti-disk rotor side of each inner piece 10e, the anti-disk rotor side of each outer piece 10f, and the anti-disk rotor side of each inner piece 10g. The lugs 6b of the friction pad 6 can be easily inserted. Further, positioning pieces 10q are provided on the side opposite to the disk rotor of the support piece 10m and on the side of the disk rotor of the extension piece 10h.

  Each friction pad 6 is formed by joining a lining 6c that is in sliding contact with the side surface of the disk rotor 2 and the back plate 6a held by the caliper support arms 3a, 3a. The ear pieces 6b, 6b for suspending pads are protruded. A pad pressing spring 11 that presses the friction pad 6 toward the disk outlet side on the side opposite to the disk rotor of the back plate 6a and on the disk inlet side, radially outward of the disk lug 6b on the disk inlet side. Is attached. Further, a pad return spring 12 for urging the friction pad 6 toward the anti-disc rotor side when braking is released is attached to the back plate 6a on the anti-disc rotor side and inside the both ear pieces 6b in the radial direction of the disc. I have.

  Each pad pressing spring 11 has a back plate mounting portion 11a which is caulked and fixed to the back plate 6a, and a thin strip 11b extending from the back plate mounting portion 11a to the side opposite to the disk rotor side via a curved portion 11c. And a pad pressing portion 11d formed by bending back to the inner surface 3j of the pad retainer attaching portion 3i via the extension piece 10h and the spring piece 10k of the pad retainer 10. 6 is pressed to the disk feeding side. The spring load of the pad pressing portion 11d is set smaller than the spring load of the spring piece 10k, and the spring load of the spring piece 10k is set smaller than the spring load of the elastic contact piece 10i of the pad retainer 10. I have.

  Each of the pad return springs 12 includes a back plate mounting portion 12a which is caulked and fixed to the back plate 6a, and a thin piece 12b extending from the back plate mounting portion 12a to the side opposite to the disk rotor side via a curved portion 12c. And a spring portion 12e provided at the tip of the spring portion 12d and elastically contacting the caliper support arm 3a against the side surface of the disk rotor.

  In the vehicle disk brake 1 formed as described above, when the boosted hydraulic fluid is supplied to the hydraulic chamber 8 by the driver's braking operation, the piston 7 advances through the cylinder hole 5d, and the action portion 5a Is pressed against one side surface of the disk rotor 2. Next, the caliper body 5 is moved toward the action portion 5a by the reaction force while being guided by the slide pins 4 and 4, and the reaction force claw 5f moves the lining 6c of the friction pad 6 on the reaction portion 5b side to the disk rotor 2 To the other side.

  At this time, the lugs 6b of the friction pads 6 are pushed out of the retainer portions 10a, 10a in a state where the inner surface 6d in the disk radial direction is pressed outward by the pad repelling pieces 10n. While being in contact with the pieces 10f, 10f and being guided by the outer pieces 10f, 10f, it is possible to move smoothly in the pad guide grooves 3d, 3d. Further, each friction pad 6 is pressed to the disk feeding side by the resilient force of the pad pressing portion 11d of the pad pressing spring 11, and comes into contact with the torque receiving surface 3k formed on the caliper support arm 3a on the disk feeding side. Since the friction pad 6 is in contact with the caliper support arm 3a due to running vibration or the like, it is possible to suppress the generation of crank sound that is a tapping sound.

  Further, since the load from the pad pressing portion 11d of the pad pressing spring 11 is received by the pad retainer mounting portion 3i via the extension piece 10h of the pad retainer 10 and the spring piece 10k, it is arranged in the pad guide groove 3d. The retainer portion 10a of the pad retainer 10 is not affected by the pad pressing spring 11, so that the lugs of the friction pad 6 can be held well and the slidability of the lugs 6b can be ensured. The extension piece 10h is formed between the extension piece 10h and the pad retainer attachment part 3i by forming a spring piece 10k projecting toward the pad retainer attachment part side and elastically contacting the pad retainer attachment part 3i. Can be elastically filled by the spring piece 10k, and the load of the pad pressing spring 11 can be reliably received by the pad retainer mounting portion 3i. Further, the tip portion 10j of the spring piece 10k elastically contacts the pad retainer portion attaching portion 3i, thereby positioning the pad retainer 10 and restricting the movement of the pad retainer 10 in the disk axial direction.

  The spring piece 10k has a simple structure in which a part of the extension piece 10h is cut out, and the base is formed by folding back a tip end 10j of a strip piece integrated with the extension piece 10h toward the pad retainer mounting portion side. Can form the spring piece 10k. Further, since the spring load of the pad pressing spring 11 is made smaller than the spring load of the spring piece 10k, the pad retainer 10 can be prevented from being deformed by the spring load of the pad pressing spring 11. Further, since the spring load of the spring piece 10k is smaller than the spring load of the elastic contact piece 10i of the pad retainer 10, there is no possibility that the mounting portion of the pad retainer 10 is displaced by the spring load of the spring piece 10k.

  Further, at the time of braking, the pad return spring 12 is deformed along with the movement of the friction pad 6, and at the time of release of braking, the pad return spring 12 returns to the initial state by the spring force of the spring portion 12d, and moves the friction pad 6 in the horizontal direction. The lining 6c can be pulled back to be separated from the side surface of the disk rotor 2, thereby preventing uneven wear of the lining 6c.

  The present invention is not limited to the above-described embodiment, and may not include the pad return spring. Further, the pad retainer may not have the pad spring portion. Further, the friction pad may have any other shape as long as it has ear pieces, and the shape of the caliper body is also arbitrary.

  DESCRIPTION OF SYMBOLS 1 ... Disc brake for vehicles, 2 ... Disc rotor, 3 ... Caliper bracket, 3a ... Caliper support arm, 3b ... Tie rod, 3c ... Guide hole, 3d ... Pad guide groove, 3e ... Disc radial outer surface, 3f ... Disc radius Inner surface, 3g ... facing surface, 3h ... mounting surface, 3i ... pad retainer mounting portion, 3j ... inner surface, 3k ... torque receiving surface, 4 ... slide pin, 5 ... caliper body, 5a ... working portion, 5b ... reaction Part, 5c bridge part, 5d cylinder hole, 5e body mounting arm, 5f reaction claw, 6 friction pad, 6a back plate, 6b ear piece, 6c lining, 6d disk radial inner surface , 7: piston, 8: hydraulic chamber, 9: mounting bolt, 10: pad retainer, 10a: retainer part, 10b: mounting part, 10c: connecting piece, 10d: pad spring , 10e ... inner piece, 10f ... outer piece, 10g ... deeper piece, 10h ... extended piece, 10i ... elastic piece, 10j ... tip part, 10k ... spring piece, 10m ... support piece, 10n ... pad elastic piece Reference numeral 10p: insertion guide piece, 10q: positioning piece, 11: pad pressing spring, 11a: back plate mounting part, 11b: elongated piece, 11c: curved part, 11d: pad pressing part, 12: pad return spring, 12a: back Plate mounting portion, 12b: slender piece, 12c: curved portion, 12d: spring portion, 12e: elastic contact portion

Claims (4)

On a caliper bracket fixed to the vehicle body, a pair of caliper support arms extending over the outer periphery of the disk rotor in the disk axial direction are extended, and the caliper support arms have a disk radial outer surface, a disk radial inner surface, A U-shaped pad guide groove having an opposing surface connecting the disk radially outer surface and the disk radially inner surface is provided to face each other, and is provided on both sides of a friction pad arranged with the disk rotor interposed therebetween. The projecting ear pieces are respectively supported in the pad guide grooves via a pad retainer, and the friction pad comes into contact with the caliper support arm on the disk retraction side of the friction pad when the vehicle advances, and the friction pad is dispensed from the disc. In a vehicle disc brake equipped with a pad pressing spring that presses to the side,
The caliper supporting arm has a pad retainer mounting portion having a mounting surface in a direction parallel to the disk radial direction outer surface of the pad guide groove formed outside the pad guide groove in a disk radial direction,
The pad retainer includes a U-shaped retainer mounted in the pad guide groove, an extension piece extending radially outward from a radially outer end of the retainer, and an elastic piece attached to the mounting surface. A mounting portion having a resilient contact piece that comes into contact with the pad retainer mounting portion side, and a spring piece that resiliently contacts the pad retainer mounting portion is formed on the extension piece.
The disk brake according to claim 1, wherein the pad pressing spring is attached to a radially outer side of the ear pad of the friction pad with respect to the ear piece, and abuts on the pad retainer attachment portion via the extension piece. The spring piece is formed by cutting out a part of the extension piece, and forming a base part by folding a tip end of a strip piece integral with the extension piece toward a pad retainer attachment portion side, and attaching the tip end to the pad retainer attachment portion. The vehicle disk brake according to claim 1, wherein the disk brake is elastically contacted with the vehicle. The vehicle disc brake according to claim 1, wherein a spring load of the pad pressing spring is smaller than a spring load of the spring piece. 4. The vehicle disk brake according to claim 1, wherein a spring load of the spring piece is smaller than a spring load of the elastic contact piece of the pad retainer. 5.

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