JP6149273B2 - Disc brake - Google Patents

Description

  The present invention relates to a disc brake that applies a braking force to a vehicle such as an automobile.

  In general, a disc brake provided in a vehicle such as an automobile is provided with a mounting member attached to a non-rotating portion of the vehicle and provided with a pad guide at a position facing the rotating direction of the disc, and is slidably provided on the mounting member. A caliper, a protrusion inserted into the pad guide of the mounting member, a pair of friction pads pressed against the disk by the caliper, and elastically supporting the friction pads attached to the mounting member And a pad spring or the like.

  The pad spring is fitted in the recess of the pad guide and is attached to guide the friction pad in the axial direction of the disk. The pad spring extends from the guide plate and is provided in the radial direction of the disk. And a radial urging portion for urging (see, for example, Patent Document 1).

Japanese Utility Model Publication No. 6-80034

  By the way, the above-described pad spring according to the prior art has a friction at a position where the radial urging portion that urges the friction pad in the radial direction of the disk protrudes from the concave portion of the pad guide to the outside (center side in the disk rotation direction of the friction pad). It is in contact with the protrusion of the pad. For this reason, the radial biasing portion of the pad spring generates a biasing force that tilts the protruding portion of the friction pad obliquely with respect to the concave portion of the pad guide, and the guide plate portion of the pad spring extends from the concave portion of the pad guide. There is a risk that it will behave like floating. As a result, the support of the friction pad by the pad guide becomes unstable in the rotation direction of the disc, which causes a brake squeal. In particular, there is a problem that a brake squeal is likely to occur during light load braking at a vehicle slow speed.

  The present invention has been made in view of the above-described problems of the prior art, and an object of the present invention is to suppress the occurrence of brake squeal.

  In order to solve the above-described problems, a disc brake of the present invention has a pair of pad guides that are attached to a non-rotating portion of a vehicle, are formed so as to straddle the outer peripheral side of the disc in the axial direction, and are spaced apart in the rotational direction of the disc. A mounting member, a caliper provided slidably on the mounting member, a protrusion inserted into a pad guide of the mounting member, and a pair of friction pads pressed against the disk by the caliper; A pad spring that is attached to the mounting member and elastically supports the friction pads, and the pad guides of the mounting member have projecting portions of the friction pads through the pad springs in the axial direction of the disk. A recess is formed which is fitted to be displaceable.

A feature of the configuration adopted by the present invention is that the pad spring is fitted in and attached to a concave portion of the pad guide and guides the friction pad in the axial direction of the disk, and the guide plate portion A radial urging portion that extends from the radial direction and urges the friction pad in the radial direction of the disk, and the radial urging portion includes a surface direction of the friction pad from the guide plate portion. An extending portion extending along the curled portion, a curled portion folded back at the distal end side of the extending portion, and a distal end extending so as to face the extending portion in a direction approaching the guide plate portion from the curled portion. And a contact portion that abuts against a radially inner side surface of the protruding portion of the friction pad within the recess of the pad guide, and the radial urging portion has the curl portion as the disk of the recess. It is arranged so as to be in axial extent, Ki径direction biasing unit, said has a curled portion comprises at least two, the curled portion are formed on the disk axial direction inside and outside with respect to the center plane of the friction pad.

  According to the present invention, occurrence of brake squeal can be suppressed.

It is the top view which looked at the disc brake by embodiment of this invention from upper direction. It is the front view which looked at the disc brake from the arrow II-II direction in FIG. It is sectional drawing which looked at the attachment member, the pad spring, etc. from the arrow III-III direction in FIG. 2 in the state which removed the caliper. It is a side view which shows a pad spring alone. It is the front view which looked at the pad spring from the arrow VV direction in FIG. It is the top view which looked at the pad spring from the arrow VI-VI direction in FIG. It is a perspective view which shows a pad spring alone. It is a front view of the principal part expansion which shows the (VIII) part in FIG. 2 which shows an attachment member, a pad spring, and a friction pad in the state which removed the caliper.

  Hereinafter, the disc brake according to the present embodiment will be described in detail with reference to FIGS.

  The disc 1 shown in FIGS. 1 and 2 rotates, for example, in the direction of arrow A in FIGS. 1 and 2 together with wheels (not shown) when the vehicle travels in the forward direction, and when the vehicle moves backward, It rotates in the direction indicated by B.

  The attachment member 2 is attached to a non-rotating part of the vehicle. As shown in FIGS. 1 to 3, the mounting member 2 includes a pair of arms 2 </ b> A extending in the axial direction of the disk 1 so as to be spaced apart in the rotational direction (circumferential direction) of the disk 1 and straddle the outer periphery of the disk 1. 2A and a thick support portion 2B, etc., which are provided so as to connect the base end sides of the respective arm portions 2A so as to be integrated, and are fixed to a non-rotating portion of the vehicle at a position on the inner side of the disc 1. It is comprised including.

  The attachment member 2 is formed with a reinforcing beam 2C that connects the distal ends of the arms 2A and 2A to each other at a position on the outer side of the disk 1. Thus, the arm portions 2A and 2A of the mounting member 2 are integrally connected by the support portion 2B on the inner side of the disc 1 and are integrally connected by the reinforcing beam 2C on the outer side.

  Each arm portion 2A of the mounting member 2 is formed with a disc path portion 2A1 extending in an arc along the outer periphery (rotation locus) of the disc 1 at a position that is an intermediate portion in the axial direction of the disc 1 (see FIG. 3). ). Inner side and outer side pad guides 3 are formed on both sides of the disc 1 in the disc path portion 2A1 in the axial direction. Each arm 2A is provided with a pin hole (not shown). In these pin holes, a slide pin 6 described later is slidably inserted.

  A pair of pad guides 3 provided on the mounting member 2 so as to be spaced apart from each other in the rotation direction of the disk 1 (left and right in FIG. 2) have a recess 4 having a U-shaped cross section as shown in FIG. Yes. The recess 4 of the pad guide 3 is formed to extend in a direction in which a friction pad 9 described later slides, that is, in the axial direction of the disk 1. The pad guide 3 is unevenly fitted to the protrusions 10A and 10B so as to sandwich protrusions 10A and 10B of a friction pad 9, which will be described later, from above and below (disk radial direction).

  As a result, each pad guide 3 guides the friction pad 9 in the axial direction of the disk 1 through these protrusions 10A and 10B. The back side wall surface of the recess 4 of the pad guide 3 constitutes a torque receiving surface 4A as a so-called torque receiving portion. The torque receiving surface 4A receives a braking torque generated during a brake operation from the friction pad 9 through the protruding portions 10A and 10B.

  That is, among the left and right pad guides 3 and 3 in FIG. 2, the pad guide 3 on the left side in the drawing, which is located on the rotation direction exit side (hereinafter referred to as the “return side”) of the disk 1 rotating in the arrow A direction. In particular, the torque receiving surface 4A of the concave portion 4 is provided with a protruding portion 10B of the back plate 10 of the friction pad 9 and a guide plate portion of the pad spring 13 described later. Accept through 17. Further, the bottom side of the pad guide 3 on the right side, that is, the torque receiving surface 4A of the recess 4 located on the rotation direction entrance side (hereinafter referred to as the turn-in side) of the disk 1 rotating in the direction indicated by the arrow A is the rotation direction described later. The biasing member 12 is disposed in a state slightly separated from the protrusion 10 </ b> A of the friction pad 9.

  The caliper 5 is slidably provided on the mounting member 2. As shown in FIG. 1, the caliper 5 includes an inner leg 5A provided on the inner side which is one side of the disk 1 and an inner leg so as to straddle the outer peripheral side of the disk 1 between each arm 2A of the mounting member 2. A bridge portion 5B extending from the portion 5A to the outer side, which is the other side of the disc 1, and an outer side, which is the tip side of the bridge portion 5B, extending inward in the radial direction of the disc 1, with the tip side being bifurcated And an outer leg portion 5C as a claw portion.

  A cylinder (not shown) into which the piston 5D is slidably inserted is formed on the inner leg portion 5A of the caliper 5. Further, the inner leg portion 5A is provided with a pair of attachment portions 5E and 5E protruding in the left and right directions in FIG. Each mounting portion 5E supports the entire caliper 5 slidably on each arm portion 2A of the mounting member 2 via a sliding pin 6 described later.

  As shown in FIG. 1, the sliding pin 6 is fastened to each mounting portion 5 </ b> E of the caliper 5 using a bolt 7. The distal end side of each sliding pin 6 extends toward the pin hole of each arm 2 </ b> A of the mounting member 2 and is slidably inserted into each pin hole of the mounting member 2. As shown in FIG. 1, protective boots 8 are respectively attached between the arm portions 2A and the sliding pins 6, and rainwater or the like enters between the sliding pins 6 and the pin holes of the arm portions 2A. Is preventing.

  The inner friction pad 9 and the outer friction pad 9 are disposed to face both surfaces of the disk 1. Each friction pad 9 is provided with a flat plate-like back plate 10 extending substantially in the shape of a fan in the rotation direction (circumferential direction) of the disk 1 and fixedly attached to the surface of the back plate 10 and is in frictional contact with the surface of the disk 1. And a lining 11 (see FIG. 1) as a friction material.

  The back plate 10 of the friction pad 9 has projecting portions 10 </ b> A and 10 </ b> B having convex shapes on the side surface portions located on both sides in the rotational direction of the disk 1. The protrusions 10 </ b> A and 10 </ b> B are concavo-convexly fitted into the recess 4 of the pad guide 3 of the mounting member 2, whereby the friction pad 9 is movable in the axial direction of the disk 1. The protrusions 10A and 10B constitute a torque transmission unit that transmits the braking torque received by the friction pad 9 from the disk 1 to the torque receiving surface 4A of the mounting member 2 when the vehicle is braked. Further, on the back surface of the back plate 10, projections 10 </ b> C for fixing a rotation direction urging member 12 to be described later are formed at portions corresponding to the protrusions 10 </ b> A and 10 </ b> B.

  The protrusions 10A and 10B of the friction pad 9 (back plate 10) are formed symmetrically on the left and right and have the same shape. One projecting portion 10A is arranged on the rotation direction entrance side (turn-in side) of the disc 1 that rotates in the direction indicated by arrow A when the vehicle moves forward, and the other projecting portion 10B is disposed on the exit direction side of the disc 1 in the rotation direction. It is arranged on the (delivery side). Of the left and right protrusions 10A and 10B serving as the torque transmission part of the friction pad 9, a rotation direction biasing member 12 to be described later is provided on the protrusion 10A located on the turn-in side of the disk 1 via the protrusion 10C. Is provided.

  The rotational direction biasing member 12 provided in each friction pad 9 is formed by bending (press molding) a stainless steel plate having elasticity, for example, the protruding portions 10A and 10B of the back plate 10 of the friction pad 9. Among them, the base end side is fixed to the convex portion 10C of the projecting portion 10A, which becomes the disk insertion side when the vehicle moves forward, by means of caulking or the like. The method of fixing the rotational direction biasing member 12 to the back plate 10 is not limited to caulking. For example, the protruding portion 10A may be fixed to the back plate 10 by a clip method that sandwiches the protruding portion 10A in the axial direction of the disk 1. .

  The distal end side of the rotation direction biasing member 12 abuts on the torque receiving surface 4A of the mounting member 2 in an elastically deformed state via a counter plate 19 of a pad spring 13 (guide plate portion 17) described later. As a result, the rotation direction biasing member 12 biases the friction pad 9 toward the delivery side of the disk 1, and the friction pad 9 moves in the rotation direction (circumferential direction) of the disk 1 due to vibrations or the like when the vehicle travels. It is something that prevents tapping.

  Next, the pad spring 13 according to the present embodiment will be described.

  A pair of pad springs 13, 13 are attached to each arm 2 </ b> A of the attachment member 2. The pad springs 13 elastically support the friction pads 9 on the inner side and the outer side, respectively, and smooth the sliding displacement of the friction pads 9 in the disk axial direction. Each pad spring 13 is formed, for example, by bending (press forming) a spring steel such as a stainless steel plate having a spring property as shown in FIGS.

  The pad spring 13 includes a connecting plate 14, a flat plate 15, an engagement plate 16, a guide plate portion 17, and a radial biasing portion 22 which will be described later. Regarding the respective parts of the pad spring 13, in the following description, the terms “upper”, “upper surface” or “upward” mean the radially outer side, the radially outer surface of the disk 1 or the radially outward direction. As used herein, the terms “lower”, “lower” or “downward” are used to mean the radially inner side, the radially inner surface or the radially inward direction of the disk 1.

  The connecting plate 14 of the pad spring 13 connects the pair of flat plates 15 of the pad spring 13 together with the guide plate portions 17 described later. That is, the guide plate portions 17 are connected to the inner side and the outer side of the disc 1. In order to integrally connect with each other, the disk 1 extends in the axial direction in a state of straddling the outer peripheral side of the disk 1. A pair of flat plates 15, 15 extend inward in the radial direction of the disk 1 and are integrally formed at both ends in the length direction of the connecting plate 14.

  The engaging plate 16 is located between the pair of flat plates 15 and 15 and is formed integrally with the connecting plate 14, and is attached to the mounting member 2 so as to engage with the disk path portion 2A1 of the arm portion 2A from the radially inner side. Yes. As a result, the pad spring 13 is positioned in the axial direction of the disk 1 with respect to the arm 2 </ b> A of the mounting member 2.

  The pair of guide plate portions 17 and 17 are provided on both end sides of the connecting plate 14 via the respective flat plates 15. Each guide plate portion 17 is formed by being bent into a substantially U shape from the lower end (front end side) of the flat plate 15. One guide plate portion 17 of the pair of guide plate portions 17 is fitted and attached in the recess 4 of the inner side pad guide 3, and the other guide plate portion 17 is a recess of the outer side pad guide 3. 4 is fitted and attached. The guide plate portions 17 and 17 include a support plate 18, a counter plate 19, a guide plate 20, and a lower surface plate 21.

  The support plate 18 of the guide plate portion 17 extends outward in the rotational direction of the disk 1 so as to be bent 90 degrees from the lower end side of the flat plate 15. The support plate 18 is disposed to face a radial urging portion 22 described later. The support plate 18 is brought into contact with the radially outer surfaces 10A1 and 10B1 which are the upper surface sides (the radially outer side of the disk 1) of the protrusions 10A and 10B of the friction pad 9 by the biasing force of the radial biasing portion 22. Is.

  The support plate 18 is integrally formed with an insertion guide 18 </ b> A that protrudes outward in the axial direction of the disk 1 and has a tip (projecting end) side inclined obliquely outward in the radial direction of the disk 1. The insertion guide 18A is configured such that when the protrusions 10A and 10B of the friction pad 9 are inserted between the support plate 18 of the guide plate part 17 and the radial biasing part 22, the protrusions 10A and 10B are guided by the guide plate part. 17 is provided in order to smoothly guide the inside.

  The counter plate 19 extending from the support plate 18 toward the inside in the radial direction of the disk 1 is formed on the back side wall surface of the pad guide 3 (that is, the torque receiving surface 4A) when the pad spring 13 is attached to the attachment member 2. Abut. The counter plate 19 is opposed to the rotation direction outer side surfaces 10A2 and 10B2 positioned on the outer side in the rotation direction of the disk 1 of the protrusions 10A and 10B of the friction pad 9.

  A guide plate 20 provided in the same plane as the opposing plate 19 from the opposing plate 19 toward the outer side in the axial direction of the disk 1 is provided with the protruding portions 10A and 10B of the friction pad 9 and the support plate 18 of the guiding plate portion 17. Is provided to smoothly guide the protrusions 10 </ b> A and 10 </ b> B to the inside of the guide plate portion 17 when inserted between the guide plate portion 17 and the radial biasing portion 22. An inclined portion 20 </ b> A that is inclined obliquely toward the outer side in the rotational direction of the disk 1 is provided on the distal end side of the guide plate 20.

  Since the inclined portion 20A of the guide plate 20 is inclined outward in the rotational direction of the disk 1, the protruding portions 10A and 10B of the friction pad 9 are connected to the support plate 18 of the guide plate portion 17 and the radial direction urging portion 22. When inserted between them, the projecting portions 10A and 10B can be smoothly guided inside the guide plate portion 17 together with the insertion guide 18A of the support plate 18.

  The lower surface plate 21 extending toward the inner side in the rotation direction of the disk 1 so as to be bent 90 degrees from the lower end side of the opposing plate 19 faces the support plate 18 in the radial direction of the disk 1. The lower plate 21 and the support plate 18 are connected by a counter plate 19.

  Thus, the guide plate portion 17 is formed in a substantially U-shape or a substantially U-shape that is recessed in a concave shape by the support plate 18, the counter plate 19, and the lower surface plate 21. The guide plate 17 is fitted and attached in the recess 4 of the pad guide 3 to guide the friction pad 9 in the axial direction of the disk 1.

  Next, the radial urging portion 22 according to the present embodiment will be described.

  The radial urging portion 22 provided so as to extend from the guide plate portion 17 is elastic to the radially inner side surfaces 10A3 and 10B3 which are the lower surface side (the radially inner side of the disk 1) of the protruding portions 10A and 10B of the friction pad 9. Abutting in a deformed state, the friction pad 9 is urged toward the radially outer side of the disk 1. Thereby, it can suppress that the friction pad 9 rattles with respect to the attachment member 2. FIG. The radial urging portion 22 includes an extending portion 23, a curled portion 24, and a contact portion 25.

  The extending portion 23 constituting the radial urging portion 22 is composed of a pair of circumferential extending portions 23A and 23B that are spaced apart from each other in the axial direction of the disk 1, and the circumferential extending portions 23A and 23B are thin. It is formed as a spring piece and extends from the lower surface plate 21 of the guide plate portion 17 along the surface direction of the friction pad 9 to the inner side in the disk rotation direction.

  Specifically, as shown in FIGS. 4 to 7, one circumferentially extending portion 23 </ b> A is a friction pad from the side closer to the disk 1 on the inner side in the rotational direction of the disk 1 of the lower surface plate 21. 9 extends inwardly in the surface direction of the disk 1 (in the rotational direction of the disk 1) and radially inward of the disk 1. The other circumferentially extending portion 23 </ b> B is a friction pad 9 at a position away from the one circumferentially extending portion 23 </ b> A in the axial direction of the disk 1, among the end portions of the lower surface plate 21 on the inner side in the rotational direction of the disk 1. Are extended toward the inner side in the radial direction of the disk 1.

  That is, these circumferentially extending portions 23A and 23B are bent into a “<” shape from the lower surface plate 21 of the guide plate portion 17 toward the inner side in the radial direction of the disk 1, thereby forming the concave portion 4 of the pad guide 3. It is formed to be inclined obliquely downward.

  The curled portion 24 of the radial urging portion 22 is bent and bent into a substantially C shape or a substantially U shape with the distal end side of the circumferentially extending portion 23A as a whole curled upward (radially outward of the disk 1). One circumferential curl portion 24A formed by turning it back, and like the circumferential curl portion 24A, the tip end side of the circumferentially extending portion 23B is generally upward as the entire curled portion (outward in the radial direction of the disk 1). It is formed by the other circumferential curl portion 24B formed by bending in a C shape or a substantially U shape. Specifically, the circumferential curl portions 24A and 24B are shaped such that they are once bent downward from the tips of the circumferentially extending portions 23A and 23B and then bent and folded upward. That is, the circumferential curls 24A and 24B are formed in a convex shape on the lower side when viewed from the axial direction of the disk 1.

  The contact portion 25 of the radial urging portion 22 extends obliquely upward in the direction approaching the guide plate portion 17 from the tip of the circumferential curl portions 24A and 24B, and is formed to be inclined outward in the radial direction of the disk 1. . And the contact part 25 is comprised by two circumferential direction folding | returning parts 25A and 25B and the contact board part 25C.

  One circumferential turn portion 25A extends from the tip of one circumferential curl portion 24A toward the guide plate portion 17 and faces one circumferential extension portion 23A in the upward and downward directions (in the radial direction of the disk 1). It is arranged at the position to do. Further, the other circumferential turn portion 25B extends from the tip of the other circumferential curl portion 24B toward the guide plate portion 17, and upward and downward with respect to the other circumferential extension portion 23B (the radial direction of the disk 1). It is arrange | positioned in the position which opposes.

  The contact plate portion 25C is integrally formed at the distal ends of the circumferentially folded portions 25A and 25B so as to extend from the distal ends of the two circumferentially folded portions 25A and 25B toward the guide plate portion 17, and the support plate of the guide plate portion 17 18 is arranged so as to face the lower surface plate 21 so as to be overlapped in the upper and lower directions. That is, the contact plate portion 25 </ b> C extends toward the guide plate portion 17 side with respect to the end portion 4 </ b> B of the recessed portion 4 of the pad guide 3, and is disposed with a gap between the support plate 18 and the lower surface plate 21.

  In a state before the protrusions 10A and 10B of the friction pad 9 are inserted into the guide plate portion 17, the pad spring 13 is disposed between the contact plate portion 25C and the support plate 18 between the friction pad 9 ( A gap for sandwiching the protruding portions 10A and 10B of the back plate 10) is formed. In addition, a gap smaller than the above gap is formed between the contact plate portion 25C and the lower surface plate 21 so as to allow elastic deformation of the contact portion 25.

  The abutting plate portion 25C is formed as a plate extending in the axial direction of the disc 1, and the length dimension (dimension in the disc axial direction) of the abutting plate portion 25C is the same as the counter plate 19 of the guide plate portion 17 and the guide. The total length of the disk 1 is approximately the same as the axial length of the disk 1. Thus, when the protrusions 10A and 10B of the friction pad 9 are inserted between the support plate 18 of the guide plate part 17 and the radial biasing part 22, the protrusions 10A and 10B of the friction pad 9 are radially inward. The side surfaces 10A3 and 10B3 can be smoothly guided onto the contact plate portion 25C. Furthermore, the abutting plate portion 25C is formed as a connecting plate that extends in the axial direction of the disk 1 and connects the two circumferentially folded portions 25A and 25B to each other.

  When the protruding portions 10A and 10B of the friction pad 9 are inserted into the guide plate portion 17 of the pad spring 13, the radial biasing portion 22 has a contact plate portion 25C of the protruding portions 10A and 10B of the friction pad 9. And elastically deformed so as to be sandwiched between the lower surface plate 21 and the lower surface plate 21. In this state, the radial urging portion 22 elastically urges the protruding portions 10A and 10B of the friction pad 9 (back plate 10) toward the radially outer side of the disk 1 so that the friction pad 9 is attached to the mounting member 2. In contrast, the disk 1 is prevented from rattling in the radial direction.

  Further, the extending portion 23 of the radial urging portion 22 is formed by two circumferential extending portions 23A and 23B made of thin spring pieces, and the circumferential curled portions 24A and 24B and the abutting portion 25 of the curled portion 24 are formed. The circumferential folded portions 25A and 25B are also formed as thin spring pieces. Thereby, circumferential extension part 23A, 23B, circumferential direction curl part 24A, 24B, and circumferential direction return part 25A, 25B can suppress that the spring force of the radial direction urging | biasing part 22 becomes large more than necessary. The urging force in the radial direction of the disk 1 can be set to an appropriate magnitude.

  Further, the contact plate portion 25 </ b> C is formed as a long plate extending in the axial direction of the disk 1. Thereby, the contact plate portion 25C can apply a stable biasing force toward the upper side in the radial direction of the disk 1 with respect to the protruding portions 10A and 10B of the friction pad 9, and widen the contact surface between the two. Can do. Further, the protrusions 10A and 10B of the friction pad 9 can be smoothly slid and displaced in the axial direction of the disk 1 on the contact plate 25C.

  The disc brake according to the present embodiment has the above-described configuration, and the operation thereof will be described next.

  First, when braking the vehicle, the brake fluid pressure is supplied to the inner leg portion 5A (cylinder) of the caliper 5 to displace the piston 5D toward the disk 1, thereby causing the inner friction pad 9 to move. Press against one side of the disc 1. At this time, since the caliper 5 receives a pressing reaction force from the disk 1, the entire caliper 5 is slid to the inner side with respect to the arm portion 2A of the mounting member 2, and the outer leg portion 5C is a friction pad on the outer side. 9 is pressed against the other side of the disk 1.

  As a result, the inner and outer friction pads 9 strongly hold the disk 1 rotating in the direction of arrow A in FIG. 1 and FIG. 2 (when the vehicle moves forward) from both sides in the axial direction. The disc 1 can be given a braking force. When the brake operation is released, the hydraulic pressure supply to the piston 5D is stopped, so that the inner and outer friction pads 9 are separated from the disk 1 and return to the non-braking state again.

  Further, of the protrusions 10A and 10B of the friction pad 9, the protrusion 10A located on the side of the disk 1 is urged in the direction indicated by the arrow C in FIG. Is always urged toward the delivery side of the disk 1 with a weak force. Then, the protruding portion 10B located on the delivery side of the disk 1 is elastically pressed against the torque receiving surface 4A of the pad guide 3 through the guide plate portion 17 of the pad spring 13 by the biasing force at this time.

  For this reason, the friction pad 9 rattling in the rotational direction (circumferential direction) of the disk 1 due to vibrations or the like during traveling of the vehicle is caused by the protrusion 10A on the disk insertion side and the torque receiving surface 4A of the recess 4. It can regulate by the rotation direction biasing member 12 provided in between. Then, the braking torque (rotation torque in the direction of arrow A) received by the friction pad 9 from the disk 1 during braking operation when the vehicle moves forward is received by the arm portion 2A (torque receiving surface 4A of the pad guide 3) on the delivery side. I can accept it.

  As a result, the protruding portion 10 </ b> B located on the disk delivery side of the friction pad 9 continues to contact the torque receiving surface 4 </ b> A of the pad guide 3 via the guide plate portion 17. Moreover, the projecting portion 10B on the delivery side is in contact with the guide plate portion 17 by the action of the rotation direction biasing member 12 before the brake operation, and there is no clearance. Thereby, it is suppressed that the friction pad 9 moves by braking torque and an abnormal noise (rattle sound) is generated.

  Further, the protrusions 10A and 10B of the friction pad 9 are slidably inserted through the guide plate portion 17 of the pad spring 13 into the recess 4 of the pad guide 3 located on the turn-in side and the turn-out side of the disc 1. It is fitted and urged outward in the radial direction of the disk 1 by the radial urging portion 22.

  Thereby, the radial urging portion 22 of the pad spring 13 can suppress the friction pad 9 from rattling in the radial direction of the disk 1 due to vibration or the like during traveling. When the brake is operated, the inner and outer friction pads 9 are held in the guide plate portion 17 while the protruding portions 10A and 10B of the friction pad 9 are kept in sliding contact with the support plate 18 side of the guide plate portion 17. Can be smoothly guided in the axial direction of the disk 1 along the line.

  The pad spring 13 employed in the present embodiment is fitted to and attached to the recess 4 of the pad guide 3 to guide the friction pad 9 in the disk axial direction, and extends from the guide plate 17. A radial urging portion 22 that is provided and urges the friction pad 9 in the radial direction of the disk 1 is provided. The radial urging portion 22 extends from the guide plate portion 17 along the surface direction of the friction pad 9 in the circumferential direction of the disk, and a curl folded back at the distal end side of the extending portion 23. And the radial direction of the protrusions 10A and 10B of the friction pad 9 in the recess 4 of the pad guide 3 with the tip 24 extending in a direction approaching the guide plate 17 from the curl 24 The contact portions 25 that contact the inner side surfaces 10A3 and 10B3 are integrally formed.

  Thus, the pad spring 13 is formed so that the abutting portion 25 of the radial urging portion 22 extends into the concave portion 4 of the pad guide 3, so that the protruding portions 10 </ b> A and 10 </ b> B of the friction pad 9 are radially formed. The abutting portion 25 of the urging portion 22 can be brought into contact with the recessed portion 4 of the pad guide 3. As a result, the contact plate 25C of the contact portion 25, which is the biasing point of the biasing force of the radial biasing portion 22, and the support plate 18 of the guide plate portion 17 of the pad spring 13, which is the fulcrum of the biasing force, are discs. 1 in the vertical direction in the radial direction (on the paper surface in FIG. 2, downward).

  Therefore, the abutting plate portion 25 </ b> C whose urging force is the urging point when the radial urging portion 22 elastically presses the protrusions 10 </ b> A and 10 </ b> B of the friction pad 9 toward the radially outer side of the disk 1. Therefore, the pad spring 13 has no rotating element, and the pad spring 13 is directed from the concave portion 4 of the pad guide 3 toward the inner side in the rotation direction of the disk 1. It is possible to suppress the protrusion (the opposing plate 19 is separated from the recess 4).

  Here, in the prior art disclosed in Patent Document 1, the radial biasing portion of the pad spring and the protruding portion of the friction pad are not inside the concave portion of the pad guide but outside the concave portion (the center side in the disc rotation direction of the friction pad). ), The urging point of the urging force and the fulcrum are displaced (offset) in the rotation direction of the disc. For this reason, there is a possibility that the guide plate portion of the pad spring may behave so as to be lifted from the concave portion of the pad guide by generating an urging force that tilts the protruding portion of the friction pad obliquely with respect to the concave portion of the pad guide. . As a result, there is a problem that the support of the friction pad by the pad guide becomes unstable in the disk rotation direction, which causes a brake squeal.

  However, according to this embodiment, since the pad spring 13 can be stably assembled to the mounting member 2, it is possible to prevent the friction pad 9 from rattling in the rotational direction of the disk 1 due to vibrations or the like when the vehicle travels. In addition, the brake squeal (low pressure squeal) can be suppressed.

  Further, according to the present embodiment, the radial urging portion 22 of the pad spring 13 extends from the guide plate portion 17 toward the inner side in the rotational direction of the disk 1 and is below the protrusions 10A and 10B of the friction pad 9. The dead space on the side (in the radial direction of the disk 1) is used. As a result, the radial urging portion 22 does not protrude from the concave portion 4 of the pad guide 3 toward the outer side in the axial direction of the disc 1 and is disposed inside the mounting member 2. For example, when the parking brake is electrified For example, even if a motor, a gear, or the like is complicated around the disc brake, it is possible to avoid interference between the radial biasing portion 22 and other parts such as the motor and the gear.

  Here, in the prior art according to Patent Document 1, since the radial biasing portion is formed in parallel with the concave portion of the pad guide, the spring length of the radial biasing portion that biases the friction pad in the radial direction of the disk. Is short. Thereby, the spring constant of a radial direction urging | biasing part will become large. As a result, the variation in the load that restrains the friction pad becomes large, causing excessive drag torque due to excessive spring load, degradation of judder resistance, and abnormal noise (rattle noise) of the friction pad due to excessive spring load. There is a fear.

  However, according to the present embodiment, the radial urging portion 22 is padded by bending the extending portion 23 of the radial urging portion 22 from the guide plate portion 17 toward the radial inner side of the disk 1. The guide 3 is formed to be inclined with respect to the recess 4.

  Thereby, compared with the thing by the prior art which formed the radial direction biasing part in parallel with the recessed part of a pad guide, since the spring length of the radial direction biasing part 22 can be formed long, a radial direction biasing part The spring constant of 22 can be reduced. As a result, the variation in the load that restrains the friction pad 9 can be reduced, so that excessive drag torque can be reduced, the anti-judder performance can be improved, and abnormal noise (rattle noise) can be generated by the friction pad 9. Can be suppressed.

  In the above-described embodiment, the extending portion 23 of the radial urging portion 22 constituting the pad spring 13 is the side closer to the disc 1 in the end portion on the inner side in the rotational direction of the disc 1 of the lower surface plate 21. As an example, the case of extending from two locations of the circumferentially extending portion 23A and the circumferentially extending portion 23B on the side away from the disk 1 has been described. However, the present invention is not limited to this. For example, the extending portion may be extended in the rotational direction of the disk with the same dimension as the axial direction of the disk of the lower surface plate, or inside the rotational direction of the disk of the lower surface plate. You may extend from three or more places among the edge parts.

  In the above-described embodiment, the pad spring 13 has a configuration in which the radial urging portion 22 is disposed on the inner side and the support plate 18 is disposed on the outer side with respect to the radial direction of the disk 1. The case where the portions 10A and 10B are elastically biased toward the radially outer side of the disk 1 has been described as an example. However, the present invention is not limited to this, and for example, the positional relationship between the radial urging portion and the support plate portion may be reversed with respect to the radial direction of the disk. That is, with respect to the radial direction of the disc, a configuration in which a radial urging portion is arranged on the outer side and a support plate is arranged on the inner side, and the protruding portion of the friction pad is elastically urged toward the inner side in the radial direction of the disc. It is good.

  In the above-described embodiment, the piston 5D is slidably provided on the inner leg 5A of the caliper 5 via the cylinder, and the outer leg 5C of the caliper 5 is in contact with the friction pad 9 on the outer side. The so-called floating caliper type disc brake has been described as an example. However, the present invention is not limited to this. For example, the present invention may be applied to a so-called opposed piston type disc brake in which pistons are provided on the inner side and the outer side of a caliper.

DESCRIPTION OF SYMBOLS 1 Disc 2 Mounting member 3 Pad guide 4 Recessed part 5 Caliper 9 Friction pad 10 Back plate 10A, 10B Protrusion part 10A3, 10B3 Radial inner side surface 13 Pad spring 17 Guide plate part 22 Radial direction urging part 23 Extension part 23A, 23B Circumferentially extending portion 24 Curled portion 24A, 24B Circumferentially curled portion 25 Contact portion 25A, 25B Circumferentially folded portion 25C Contact plate portion

Claims (3)

An attachment member that is attached to a non-rotating part of the vehicle and has a pair of pad guides that are formed across the outer peripheral side of the disc in the axial direction and spaced apart in the rotational direction of the disc;
A caliper provided slidably on the mounting member;
A pair of friction pads having protrusions inserted into the pad guides of the mounting member and pressed against the disc by the calipers;
A pad spring attached to the attachment member and elastically supporting each friction pad;
In each of the pad guides of the mounting member, a disc brake in which a protruding portion of the friction pad is formed with a recessed portion that is movably fitted in the axial direction of the disc via the pad spring.
The pad spring is
A guide plate portion that fits and is fitted in a recess of the pad guide and guides the friction pad in the axial direction of the disk;
A radial biasing portion that extends from the guide plate portion and biases the friction pad in the radial direction of the disk;
In the radial direction biasing part,
An extending part extending from the guide plate part along the surface direction of the friction pad;
A curled portion that is folded back at the distal end side of the extending portion;
An abutting portion extending from the curled portion in a direction approaching the guide plate portion so as to face the extending portion, and having a distal end abutting against a radially inner side surface of the protruding portion of the friction pad in the recessed portion of the pad guide; ,
Is formed,
The radial urging portion is disposed such that the curled portion is within an axial range of the disc of the recess ,
The radial urging portion includes at least two curl portions, and the curl portions are respectively formed on the inner side and the outer side in the disk axial direction with the center plane of the friction pad interposed therebetween. Disc brake.   The extension portion is formed by bending the radial biasing portion with respect to the concave portion of the pad guide by bending the guide plate portion toward the radial inner side of the disk. Disc brake as described. 2. The disc brake according to claim 1 , wherein the abutting portion extends to the outer side in the disc axial direction than the curled portion formed on the outer side in the disc axial direction of the curled portion.

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