JP6050708B2 - Vehicle disc brake - Google Patents

Description

  The present invention relates to a vehicle disc brake, and more particularly, to a vehicle including a ventilated disc rotor and a pair of friction pads disposed on both sides of the ventilated disc rotor and in sliding contact with the ventilated disc rotor. Disc brake.

  In a vehicle disc brake comprising a ventilated disc rotor and a pair of friction pads disposed on both sides of the ventilated disc rotor and in sliding contact with the ventilated disc rotor, the pair of annular rotors of the ventilated disc rotor A plurality of ribs extending radially are provided between the plates, and there are a plurality of ventilation holes surrounded by two adjacent ribs and a pair of annular rotor plates, and the annular rotor plate is interposed through the ventilation holes. Outside air is introduced into the inside to cool the annular rotor plate raised by frictional heat (see, for example, Patent Document 1).

JP-A-11-117969

  However, in the above ventilated disk rotor of Patent Document 1, the annular rotor plate in the portion where the air holes are formed is expanded by the frictional heat generated by sliding the friction pad, and the expanded portion is in contact with the lining. When the annular rotor plate is cooled after releasing the brake, the shaved portion may be recessed to become a recessed portion. For this reason, at the time of braking, the end of the lining of the friction pad is caught by the concave portion of the annular rotor plate, which causes brake noise and judder.

  Therefore, the present invention provides a vehicle disc brake that can suppress brake noise and judder as much as possible even when a concave portion is generated in the annular rotor plate of the ventilated disc rotor due to frictional heat with the friction pad. It is intended to provide.

  In order to achieve the above object, a vehicle disc brake of the present invention is provided with a plurality of ribs radially between a pair of opposed annular rotor plates, and surrounded by two adjacent ribs and the pair of annular rotor plates. A ventilated disc rotor having a plurality of vent holes, a lining disposed on both sides of the ventilated disc rotor, and in sliding contact with the ventilated disc rotor, and a back plate for fixing the lining. In the vehicular disc brake including a pair of friction pads, the lining is inclined at least toward the disc insertion side when the vehicle moves forward and away from the ventilated disc rotor, at the end of the disc entry side. A disc insertion side chamfering portion that gradually becomes thinner toward the disc is provided. When the outer end in the radial direction of the disk at the base end is located outside the radial direction of the disk of the one rib, the inner end in the radial direction of the disk at the base end is the disk outlet side of the one rib. It is characterized in that it is located on the inner side of the other rib adjacent to the disk in the radial direction.

  Further, the lining is provided with a disk feeding side chamfering portion that is inclined in a direction away from the ventilated disk rotor on the disk feeding side when the vehicle moves forward, and gradually becomes thinner toward the end of the disk feeding side. In addition, the disk delivery side chamfered portion has a disk radial inner end portion of the base end portion when the outer radial end portion of the base end portion is located outside the radial direction of one rib. It is preferable that the rib is located on the inner side in the disk radial direction of the other rib adjacent to the disk insertion side of the one rib.

  According to the vehicle disc brake of the present invention, the lining is inclined at least toward the disc entry side at the time of forward movement of the vehicle in a direction away from the ventilated disc rotor, and gradually becomes thinner toward the end of the disc entry side. In addition to providing a disk feed-in side chamfer, the disc feed-in side chamfer is configured so that the disc radius at the base end is located when the outer end in the disc radial direction of the base end is located on the outer side in the disc radial direction of one rib Since the inner end in the direction is located on the inner side in the radial direction of the other rib adjacent to the disk delivery side, the friction pad lining is positioned corresponding to the rib where the concave portion of the annular rotor plate does not occur during braking. The end of the lining can be prevented from being caught by the concave part, and the occurrence of brake noise and judder can be suppressed. .

  Further, the lining is provided with a disk feeding side chamfering portion which is inclined in a direction away from the ventilated disk rotor and gradually becomes thinner toward the disk feeding side end portion on the disk feeding side when the vehicle moves forward. The disc delivery side surface chamfered portion has a disc radial inner end portion of the base end portion when the disc radial outer end portion of the base end portion is located on the outer side in the disc radial direction of one rib. By positioning the rib on the inner side in the disk radial direction of the other rib adjacent to the disk entry side of one rib, the lining of the friction pad corresponds to the rib that does not generate the concave part of the annular rotor plate even when the vehicle is reverse Since it can be brought into contact with the position reliably, the end of the lining can be prevented from being caught by the concave part, and the occurrence of brake noise and judder is suppressed. Rukoto can.

It is explanatory drawing of the disc brake for vehicles which shows one example of this invention. It is a sectional front view of a disk brake for vehicles similarly. It is III-III sectional drawing of FIG. It is IV-IV sectional drawing of FIG. 1 is a front view of a vehicle disc brake showing an embodiment of the present invention.

  FIGS. 1 to 5 show a first embodiment of the present invention. An arrow A indicates a rotation direction of a disk rotor that rotates integrally with a wheel when the vehicle moves forward. The exit side is when the vehicle is traveling forward.

  The vehicle disc brake 1 includes a ventilated disc rotor 2 that rotates integrally with wheels, a caliper bracket 3 that is fixed to a vehicle body at one side of the ventilated disc rotor 2, and a caliper bracket 3 On the inside of the caliper body 5 supported by the caliper support arms 3a and 3a through the pair of slide pins 4 and 4 so as to be movable in the disk axial direction, and the action portion 5a and the reaction portion 5b of the caliper body 5, A pair of friction pads 6, 6 disposed opposite to each other with the ventilated disk rotor 2 interposed therebetween, and shim plates 7, 7 are attached to the friction pads 6, 6.

  The ventilated disc rotor 2 includes a pair of donut disc-shaped annular rotor plates 2a, 2a, a plurality of ribs 2b extending radially between the annular rotor plates 2a, 2a, and a wheel hub (not shown). A mounting portion 2c to be mounted is integrally provided, and has a plurality of ventilation holes 2d surrounded by two adjacent ribs 2b, 2b and a pair of annular rotor plates 2a, 2a.

  The caliper body 5 includes the action portion 5a and the reaction portion 5b disposed on both sides of the ventilated disc rotor 2, and a bridge portion 5c for connecting these across the outer periphery of the ventilated disc rotor 2. A ceiling opening 5d is formed in the bridge portion 5c. The action portion 5a is provided with a cylinder hole 5e opened on the ventilated disc rotor 2 side, and a bottomed cylindrical piston 8 is inserted into the cylinder hole 5e with the opening directed toward the friction pad side. A hydraulic chamber 9 is defined between the piston 8 and the bottom of the cylinder hole. Further, slide pin mounting arms 5f and 5f are provided on both sides of the action portion 5a, and the slide pins 4 are mounted on the tips of the slide pin mounting arms 5f with mounting bolts 10, respectively. ing.

  On the inner peripheral surface of the cylinder hole 5e, a piston seal mounting groove 5g is provided in the middle in the axial direction, and a dust seal mounting groove 5h is provided around the cylinder hole opening side. The piston 8 is rolled back in the piston seal mounting groove 5g. The dust seal 12 for preventing the intrusion of dust into the cylinder hole is fitted in the dust seal mounting groove 5h of the piston seal 11 to be made.

  The caliper support arms 3a, 3a straddle the outer periphery of the ventilated disc rotor 2 in the disc axial direction from both sides of the caliper bracket 3 while sandwiching both sides of the bridge portion 5c. Each caliper support arm 3a is provided with a guide hole 3b for receiving the slide pin 4, and a pair of pad guide portions facing each other on the side surface of the ventilated disc rotor 2 are formed on both caliper support arms 3a. 3c is provided, and each pad guide portion 3c is provided with a torque receiving surface 3d facing each other. Further, a pad retainer mounting portion 3e for mounting the pad retainer 13 is provided outside the pad guide portion 3c in the disk radial direction.

  Each friction pad 6, 6 is formed of a back plate 6 a, 6 a and a lining 6 b, 6 b attached to the side of the ventilated disk rotor of the back plate 6 a, 6 a. Ear pieces 6c and 6c project from both sides of the back plate 6a in the disk rotation direction, and the pad retainers 13 are respectively attached to the pad guide portions 3c and 3c on the disk insertion side and the extraction side. The friction pads 6 and 6 are disposed on both sides of the ventilated disc rotor 2 by inserting the friction pads 6 and 6.

  The lining 6b is affixed to substantially the entire surface excluding the ear pieces of the back plate 6a. The lining 6b is inclined in the direction away from the ventilated disc rotor 2 toward the disc insertion side toward the disc insertion side end. The disk feeding side chamfer 6d that gradually becomes thin is inclined in the direction away from the ventilated disk rotor 2 on the disk feeding side, and the disk feeding that gradually becomes thin toward the disk feeding side end. A side chamfer 6e is formed. Further, as shown in FIG. 1, the disc insertion side surface taking portion 6d has a base end when the disc radial outer end portion P1 of the base end portion 6f is positioned on the outer side in the disc radial direction of one rib 2b. An inner end portion P2 in the disk radial direction of the portion 6f is formed so as to be located on the inner side in the disk radial direction of the other rib 2b adjacent to the disk delivery side of the one rib 2b. Further, the disk feed-out side chamfer 6e is configured such that the disk radial outer end P3 of the base end 6g is positioned on the outer side in the disk radial direction of one rib 2b. The portion P4 is formed so as to be located on the inner side in the disk radial direction of the other rib 2b adjacent to the disk insertion side of the one rib 2b. Further, a groove 6h is formed at the center of the lining 6b in the disk rotation direction so that the wear amount of the lining 6b can be confirmed from the ceiling opening 5d.

  In the vehicular disc brake 1 formed as described above, when the pressurized hydraulic fluid is supplied to the hydraulic chamber 9 by the driver's braking operation, the piston 8 advances through the cylinder hole 5e, and the action portion 5a. The friction pad 6 on the side is pressed to the ventilated disc rotor 2 side through the shim plate 7. In the friction pad 6 on the action side, the ear pieces 6c, 6c move the pad guide portions 3c, 3c to the ventilated disc rotor 2 side via the pad retainers 13, 13, and the lining 6b is moved to the ventilated disc. It is brought into sliding contact with one side of the rotor 2. Next, due to this reaction force, the caliper body 5 moves in the direction of the action part 5 a via the slide pins 4, 4, and the reaction force claw 5 i provided on the reaction part 5 b side becomes the reaction part via the shim plate 7. The friction pad 6 on the 5b side is pressed against the other side of the ventilated disc rotor 2. In the friction pad 6 on the reaction part side, each ear piece moves the pad guide parts 3c and 3c to the ventilated disk rotor 2 side via the pad retainers 13 and 13, and the lining 6b is moved to the ventilated disk rotor 2 side. Make sliding contact with the other side.

  At this time, friction pads 6 and 6 slide on the annular rotor plates 2a and 2a of the ventilated disc rotor 2 to generate frictional heat, so that the portion of the annular rotor plate 2a in which the air holes 2d are formed expands outward. When the annular rotor plate 2a cools after releasing the brake, the scraped portion is recessed and the concave portion 2e is generated. However, the disc of the lining 6b of the friction pad 6 is produced. The turn-in side surface take-up portion 6d has a disc radial direction inner end portion P2 of the base end portion 6f when the disc radial direction outer end portion P1 of the base end portion 6f is positioned on the outer side in the disc radial direction of one rib 2b. Since the rib 2b is formed so as to be located on the inner side in the disk radial direction of the other rib 2b adjacent to the disk delivery side of the one rib 2b, the lining 6b is formed in an annular shape during braking. Securely in a position recessed portion 2e of the motor plate 2a is corresponding to the rib 2b which does not occur the abutting state. Thereby, it can prevent that the edge part of the lining 6b is caught in the recessed part 2e of the cyclic | annular rotor board 2a, and generation | occurrence | production of a brake squeal and judder can be suppressed. Further, since the sliding area of the lining 6b can be increased as much as possible while suppressing the occurrence of brake squeal and judder, the surface pressure applied to the lining 6b can be suppressed low, and the generation of frictional heat can be suppressed.

  Further, the lining 6b is also provided with a disk delivery side surface chamfer 6e on the disk delivery side, and the disk delivery side chamfer 6e has a disc radial outer end P3 of the base end 6g as one rib. When positioned on the outer side in the radial direction of the disk 2b, the inner end P4 in the radial direction of the base end 6g is positioned on the inner side in the radial direction of the other rib 2b adjacent to the disk insertion side of the one rib 2b. Therefore, even when the vehicle is moving backward, the lining 6b of the friction pad 6 is surely brought into contact with a position corresponding to the rib 2b where the concave portion 2e of the annular rotor plate 2a does not occur. Therefore, it is possible to prevent the end portion of the lining 6b from being caught by the concave portion 2e, and to suppress the occurrence of brake noise and judder.

  The present invention is not limited to the above-described embodiment, and the shape of the base end portion of the lining disc feeding side surface chamfering portion is arbitrary, and the disc lining side chamfering portion is not provided in the lining. Things can be used. Furthermore, the present invention can also be applied to a piston-opposed vehicle disc brake.

  DESCRIPTION OF SYMBOLS 1 ... Vehicle disc brake, 2 ... Ventilated disc rotor, 2a ... Ring rotor plate, 2b ... Rib, 2c ... Mounting part, 2d ... Vent hole, 3 ... Caliper bracket, 3a ... Caliper support arm, 3b ... Guide hole 3c: Pad guide portion, 3d: Torque receiving surface, 3e ... Pad retainer mounting portion, 4 ... Slide pin, 5 ... Caliper body, 5a ... Action portion, 5b ... Reaction portion, 5c ... Bridge portion, 5d ... Ceiling opening 5e ... Cylinder hole, 5f ... Slide pin mounting arm, 5g ... Piston seal mounting groove, 5h ... Dust seal mounting groove, 5i ... Reaction force claw, 6 ... Friction pad, 6a ... Back plate, 6b ... Lining, 6c ... Ear piece , 6d: Disc feeding side chamfering part, 6e: Disc feeding side chamfering part, 6f, 6g ... Base end part, 6h ... Groove, 7 ... Shim plate, 8 ... Piston, 9 ... Hydraulic chamber, 10 ... Cleavage Bolt, 11 ... piston seal, 12 ... dust seal, 13 ... pad retainer

Claims (2)

A ventilated disk rotor having a plurality of ribs radially provided between a pair of opposed annular rotor plates and having a plurality of ventilation holes surrounded by two adjacent ribs and the pair of annular rotor plates, A vehicle disc brake comprising: a lining disposed on both sides of a ventilated disc rotor; and a pair of friction pads formed by a lining that is in sliding contact with the ventilated disc rotor and a back plate that fixes the lining. Is provided with a disk insertion side surface chamfering portion that is gradually thinned toward the disk insertion side end portion, inclined at least on the disk insertion side during vehicle advancement, in a direction away from the ventilated disk rotor, The disk feed-in side surface chamfered part is a disk whose outer end in the radial direction of the disk at the base end is a single rib. When positioned radially outward, an inner end in the radial direction of the disk of the base end is positioned on the inner side of the radial direction of another rib adjacent to the disk delivery side of the one rib. Disc brake for vehicles. The lining is provided with a disc delivery side chamfering portion that is inclined in a direction away from the ventilated disc rotor and gradually becomes thinner toward the disc delivery side end on the disc delivery side when the vehicle moves forward. The disc delivery side surface chamfered portion has a disc radial inner end portion of the base end portion when the disc radial outer end portion of the base end portion is located on the outer side in the disc radial direction of one rib. 2. The disc brake for a vehicle according to claim 1, wherein the disc brake is located on the inner side in the disc radial direction of another rib adjacent to the disc feed-in side of one rib.

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