JP2017133588A - Disc brake - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a disc brake capable of improving workability of mounting work for mounting a spring molded body on a friction pad.SOLUTION: At a pair of friction pads 7 arranged on both surfaces of a disc, a spring molded body 13 is provided for elastically displacing the friction pad 7. The spring molded body 13 includes: a fixing part 15 having a pad contact surface 15B provided at one end side and coming into contact with the friction pad 7, and fixed by caulking; an extension part 19 in which a base end side is connected to the fixing part 15, and in which a tip side extends in the direction separating from the friction pad 7 along an axial direction of the disc; a contact part 20 folded from one portion of the tip side of the extension part 19 and coming into contact with a mounting member side; and a protrusion piece part 21 protruding from the other portion of the tip side of the extension part 19 and facing a disc axial direction outside surface 8A2 of the friction pad 7 with a gap.SELECTED DRAWING: Figure 3

Description

  The present invention relates to a disc brake that applies a braking force to a vehicle.

  Generally, a disc brake provided in a vehicle such as an automobile is provided with an attachment member that is fixed to a non-rotating portion of the vehicle and is disposed across the outer peripheral side of the disc, and is provided on the attachment member so as to be movable in the axial direction of the disc. A caliper, a pair of friction pads that are movably attached to the mounting member and pressed against both sides of the disk by the caliper, and a spring molded body that is provided between the friction pad and the mounting member and elastically displaces the friction pad. It is comprised including (patent document 1).

Japanese Patent Laying-Open No. 2015-28376

  By the way, when the spring molded body is attached to the friction pad, first, the engagement hole formed in the spring molded body is engaged with the protruding portion of the friction pad and temporarily placed. Then, the spring molded body is integrally attached to the friction pad by caulking the protrusion of the friction pad. In this case, the hole diameter of the engagement hole of the spring molded body is formed to be slightly larger than the outer diameter of the protruding portion of the friction pad in consideration of manufacturing tolerances, assembly tolerances, and the like. Therefore, when the spring molded body is engaged with the protrusion of the friction pad, a gap is formed between the engagement hole of the spring molded body and the protrusion of the friction pad.

  As a result, the spring molded body may be attached in a state of being displaced with respect to the friction pad when the protrusion is caulked. Further, the spring molded body temporarily placed on the friction pad may fall off from the protruding portion before the protruding portion of the friction pad is caulked.

  Accordingly, an object of the present invention is to provide a disc brake that can improve workability and productivity when a spring molded body is attached to a friction pad.

  In order to solve the above-described problems, the disc brake of the present invention is attached to a vehicle across the outer peripheral side of the disc in the axial direction of the disc, and can slide at least a pair of friction pads arranged on both sides of the disc. A mounting member that supports the mounting member, a caliper that is slidably provided on the mounting member, presses the pair of friction pads against both surfaces of the disk, and is fixed to the friction pad, and comes into contact with the mounting member A spring molded body that elastically displaces the friction pad with respect to the mounting member, and the spring molded body has a surface that is provided on one end side and abuts against the friction pad, and is fixed by caulking. A fixed portion, a proximal end side connected to the fixed portion, a distal end side extending in a direction away from the friction pad along the axial direction of the disc, and a distal end side of the extended portion A contact portion that is folded back from the portion and contacts the mounting member side; and a projecting piece portion that protrudes from the other portion on the distal end side of the extension portion and faces the outer surface in the disc axial direction of the friction pad with a gap. It is characterized by.

  According to the present invention, workability and productivity when the spring molded body is attached to the friction pad are improved.

The top view which looked at the disc brake by an embodiment from the disk radial direction outside. The front view which looked at the disc brake from the outer side. The perspective view which shows the state which attached the spring molded object by 1st Embodiment to the friction pad. The perspective view of the principal part expansion which shows the state which temporarily fixed the spring molded object to the friction pad with the fixing tool. The disassembled perspective view which shows the state which removed the spring molded object from the friction pad. The perspective view similar to FIG. 4 which shows the state which temporarily fixed the spring molded object by 2nd Embodiment to the friction pad with the fixing tool. The disassembled perspective view which shows the state which removed the spring molded object from the friction pad. The perspective view similar to FIG. 4 which shows the state which temporarily fixed the spring molded object by 3rd Embodiment to the friction pad with the fixing tool. The disassembled perspective view which shows the state which removed the spring molded object from the friction pad.

  Hereinafter, a disc brake according to an embodiment will be described in detail with reference to the accompanying drawings.

  1 to 5 show a first embodiment. The disc 1 that rotates together with the wheels (not shown) rotates in the direction of arrow A (see FIG. 2), for example, when the vehicle travels in the forward direction, and in the direction of arrow B (see FIG. 2) when the vehicle moves backward. ).

  An attachment member 2 called a carrier is attached to a non-rotating portion (not shown) of the vehicle across the outer peripheral side of the disc 1 in the axial direction of the disc 1. Here, the attachment member 2 includes a pair of arm portions 2A and 2A, a support portion 2B, and a reinforcing beam 2C. Each arm portion 2A, 2A is spaced apart in the circumferential direction of the disk 1 (the left-right direction in FIGS. 1 and 2, referred to as the disk circumferential direction in the present application) and extends across the outer periphery of the disk 1 in the axial direction of the disk 1 ( 1 in the vertical direction of FIG. 1, the front and back directions of FIG.

  The support portion 2B is provided so as to be integrated with the base end side of each arm portion 2A, and is fixed to the non-rotating portion of the vehicle at a position on the inner side of the disc 1. The reinforcing beam 2 </ b> C connects the distal ends of the arms 2 </ b> A to each other at a position on the outer side of the disk 1. Thereby, each arm part 2A of the attachment member 2 is integrally connected by the support part 2B on the inner side of the disk 1, and is integrally connected by the reinforcing beam 2C on the outer side.

  A disc path portion (not shown) extending in an arc along the outer periphery (rotation locus) of the disc 1 is formed in the intermediate portion in the disc axial direction of each arm portion 2A of the mounting member 2. Inner side and outer side pad guides 3 (only the outer side is shown) are formed on both sides of the disc path portion of the mounting member 2 (both sides in the disc axial direction). That is, the mounting member 2 is formed with pad guides 3 as support portions on the inner side and the outer side, respectively, located on both sides of the disk circumferential direction.

  Each pad guide 3 is formed as a concave groove having a U-shaped cross section, and extends in the direction in which the friction pad 7 is slid and displaced, that is, in the axial direction of the disk 1. The pad guide 3 guides the friction pad 7 in the axial direction of the disk 1 by sandwiching the ear portions 8B and 8C of the back plate 8 constituting the friction pad 7 from above and below (disk radial direction).

  The caliper 4 is provided on the mounting member 2 so as to be movable (slidable) in the axial direction of the disk 1. The caliper 4 includes an inner leg portion 4A, a bridge portion 4B, and an outer leg portion 4C. The inner leg portion 4 </ b> A is provided on the inner side that is one side in the axial direction of the disk 1. The bridge portion 4B extends from the inner leg portion 4A to the outer side which is the other side in the axial direction of the disc 1 so as to straddle the outer peripheral side of the disc 1 between the arm portions 2A of the mounting member 2. The outer leg portion 4C is a claw portion that extends inward in the radial direction of the disk from the outer side, which is the distal end side of the bridge portion 4B, and has a forked shape at the distal end side.

  The inner leg 4A of the caliper 4 is provided with a single cylinder, for example, which is a single bore. In this cylinder, piston 4D (refer FIG. 2) is slidably inserted. As shown in FIGS. 1 and 2, the inner leg portion 4A is integrally provided with a pair of mounting portions 4E and 4E protruding in the circumferential direction of the disc. Each of these attachment portions 4E, 4E supports the entire caliper 4 slidably on each arm portion 2A of the attachment member 2 via the slide pin 5.

  The pad spring 6 is disposed between each arm 2 </ b> A of the attachment member 2 and the friction pad 7, and is attached to each arm 2 </ b> A of the attachment member 2. The pad spring 6 is fitted into the pad guide 3 to elastically support the inner and outer friction pads 7 and smooth the sliding displacement of the friction pads 7.

  The inner side and outer side friction pads 7, 7 are arranged to face both side surfaces of the disk 1 in the axial direction. Each friction pad 7 is attached to the attachment member 2 so as to be movable in the disk axial direction, and is pressed against the disk 1 by the piston 4 </ b> D of the caliper 4. Here, as shown in FIG. 3, the friction pad 7 is joined (attached) to a flat plate-like back plate 8 extending in a substantially fan shape in the circumferential direction of the disc, and the back plate 8. And a lining 9 as a friction material in frictional contact with the side surface in the axial direction. The back plate 8 can be formed of metal, resin, or the like.

  The back plate 8 of the friction pad 7 includes a main plate portion 8A located at the center, and ears 8B and 8C provided on both ends of the main plate portion 8A in the disk circumferential direction. A lining 9 is bonded to a disk facing surface 8A1 that faces the disk 1 on one side of the main plate portion 8A of the back plate 8. Further, a protrusion 11 described later is provided on the disk axial outer surface 8A2 opposite to the disk facing surface 8A1 on the other surface side of the back plate 8. The surface connecting the disk facing surface 8A1 and the disk axial direction outer surface 8A2 is the side surface 8A3 of the back plate 8.

  Each ear | edge part 8B and 8C is formed in the substantially convex shape, and is inserted in the pad guide 3 of the attachment member 2 via the pad spring 6 so that sliding is possible (insertion), respectively. Each ear portion 8B, 8C constitutes a torque transmitting portion that transmits the braking torque received by the friction pad 7 from the disk 1 to the pad guide 3 of the mounting member 2 when the vehicle is braked.

  The ear portions 8B and 8C of the friction pad 7 (back plate 8) are formed symmetrically on the left and right and have the same shape. Here, one (right side in FIG. 3) ear portion 8B is disposed on the inlet side (turn-in side) in the circumferential direction of the disk rotating in the direction of arrow A when the vehicle moves forward, and the other (left side in FIG. 3). 8C is disposed on the outlet side (the outlet side) in the circumferential direction of the disk. A spring molded body 13 to be described later is attached to one of the ear portions 8B and 8C, which is located on the turn-in side of the disk 1. In the embodiment, the spring molded body 13 is provided only on the turn-in side of the disk 1 and is not provided on the turn-out side. However, it may be provided on the delivery side as required.

  Step portions 10A and 10B are formed on opposing surfaces 8B1 and 8C1 which are the side surfaces of the back plate 8 among the respective ear portions 8B and 8C of the back plate 8 and are opposed to the back wall surface of the pad guide 3. Each of these stepped portions 10A and 10B is formed by partially cutting the facing surfaces 8B1 and 8C1, which are the end surfaces (projecting side) of the ear portions 8B and 8C, into an L shape. Each step 10A, 10B is arranged at a position closer to the outside in the radial direction than the center position in the width direction (disk radial direction) of the ears 8B, 8C.

  The step portion 10 </ b> A located on the turn-in side of the disk 1 constitutes an accommodation gap for accommodating a part of a side push spring 14 of a spring molded body 13 described later. Side push springs 14 are arranged in the stepped portion 10A so as to extend in the disk axial direction. In this case, the vibrating portion 17 that is the tip of the side push spring 14 enters between the disk facing surface 8A1 of the back plate 8 and the disk 1. That is, the side push spring 14 and / or the vibrating portion 17 is formed to extend in the disk axial direction so as to face the facing surface 8B1 (side surface) of the back plate 8.

  In the embodiment, since the tip (vibrating portion 17) of the side pressing spring 14 also functions as a wear detection function for the lining 9, the tip of the side pressing spring 14 is extended to between the disk facing surface 8A1 and the disk 1. However, if it does not also serve as a wear detection function, it does not have to extend between the disk facing surface 8A1 and the disk 1.

  The protrusion 11 is provided on the disk axial direction outer surface 8A2 of the back plate 8 on the inlet side in the disk circumferential direction. The protruding portion 11 is located in the vicinity of the ear portion 8B, that is, on the base end (base) side of the ear portion 8B, and protrudes in the direction away from the disc 1 from the disc axial direction outer surface 8A2 (outside in the disc axis direction). ing. On the other hand, the protrusion 12 is provided on the outlet side in the disk circumferential direction on the outer surface 8A2 in the disk axial direction of the back plate 8. The protruding portion 12 is located near the ear portion 8C, that is, closer to the proximal end (root) side of the ear portion 8C, and protrudes outward from the disc axial direction outer surface 8A2 toward the disc axial direction.

  These protrusions 11 and 12 are for attaching a spring molded body 13 described later to the back plate 8 of the friction pad 7. That is, the back plate 8 is provided with the protruding portions 11 and the protruding portions 12 on both sides in the disk circumferential direction of the back plate 8 so that it can be used on both the inner side and the outer side. As shown in FIGS. 2 to 3, in the embodiment, the spring molded body 13 is attached only to the protruding portion 11 and is not attached to the outlet side. However, you may attach also to the delivery side as needed.

  The protrusions 11 and 12 are formed by, for example, pressing. Specifically, a die (not shown) having holes having outer diameter shapes of the protruding portions 11 and 12 is brought into contact with the disk axial direction outer surface 8A2 of the back plate 8, and the metal is formed from the disk facing surface 8A1 side of the back plate 8. Pressurize toward the mold. As a result, the protrusions 11 and 12 are pressure-molded from the mold hole in contact with the outer surface 8 </ b> A <b> 2 in the disk axial direction of the back plate 8.

  Next, the spring molded body 13 attached to the friction pad 7 will be described.

  The spring molded body 13 is fixed to the friction pad 7 and elastically displaces the friction pad 7 with respect to the mounting member 2 by contacting the mounting member 2. The spring molded body 13 includes a side pressing spring 14 as a circumferential urging member that urges the friction pad 7 in the circumferential direction of the disk (the rotation side thereof), a vibration portion 17 that warns the wear limit of the lining 9, A return spring 18 that urges the friction pad 7 in a return direction away from the disk 1 is integrally formed.

  As shown in FIGS. 3 to 5, the spring molded body 13 has a function of pressing the friction pad 7 in the circumferential direction of the disk (the direction indicated by arrow C in FIG. 2) (side pressing function), and wear of the lining 9. A metal integrally formed spring having three functions as a whole of a return spring 18 having a function of warning the limit (wear detection function) and a function of returning the friction pad 7 to the return position separated from the disk 1 (return function). It is formed as a member. In addition, in embodiment, assemblability is improved by comprising as a metal integrally molded spring member which has three functions.

  However, the present invention is not limited to this, and the spring molded body may have a configuration in which three members having different functions are provided. Or it is good also as a return spring only of the return function which abbreviate | omitted the side pushing function and the wear detection function.

  The spring molded body 13 is a side edge portion (ear part) that becomes a disk entry side when the vehicle moves forward, among the side edge parts (ear parts 8B, 8C) of the back plate 8 constituting the friction pad 7 on the inner side and the outer side. Part 8B). The spring molded body 13 is formed by bending the spring material molded by using a means such as press molding from a metal plate having spring properties such as a stainless steel plate, so that the side press spring 14 and the return spring 18 are integrated. It is formed by molding. The inner-side spring molded body 13 and the outer-side spring molded body 13 have the same configuration except that they are formed symmetrically (plane-symmetric) with the disc 1 in between, and the following description will be given. Will be described mainly with respect to the outer side spring molded body 13.

  The side push spring 14 constitutes a spring molded body 13 together with a return spring 18 which will be described later. The side push spring 14 includes an ear portion 8B which becomes a disk insertion side when the vehicle moves forward, and the mounting member 2 facing the ear portion 8B. It is provided between the back wall surface of the pad guide 3. The side pressing spring 14 has a pressing function of urging the pad guide 3 to press the friction pad 7 in the disk circumferential direction (the direction indicated by the arrow C in FIG. 2) on the disk 1 delivery side. At the same time, the side pressing spring 14 makes a sound when the tip disposed between the back plate 8 of the friction pad 7 and the disc 1, that is, the vibrating portion 17 (tip 17 A) contacts the disc 1. By generating, it has a function of warning the wear limit of the lining 9 to the driver or the like.

  The side pressing spring 14 is configured to include a later-described return spring 18 and a common fixing portion 15 and a pressing portion 16. The fixing portion 15 and the pressing portion 16 are integrally formed with the return spring 18 by bending a spring material of a metal plate together with a vibration portion 17 described later. The pressing portion 16 extends from the outer circumferential end of the fixed portion 15 toward the outer side in the disc axial direction, and is folded back into a substantially U shape, and is formed from the bent piece 16A. The contact portion 16B extends inward in the axial direction.

  The contact portion 16B abuts (elastically contacts) the inner wall surface of the pad guide 3 of the mounting member 2 in an elastically deformed state via the pad spring 6. The pressing portion 16 of the side pressing spring 14 has the contact portion 16B elastically contacting the back wall surface via the pad spring 6 so that the friction pad 7 is attached to the circumferential direction of the disc, more specifically, to the delivery side of the disc 1. Rush.

  The vibration part 17 formed integrally with the side pressing spring 14 extends from the front end side of the pressing part 16 (contact part 16B) toward the disk 1. When the lining 9 of the friction pad 7 is worn to a predetermined portion (wear limit) set in advance, the vibration portion 17 is vibrated in contact with the axial side surface (surface) of the disk 1 to vibrate. This is a wear sensor that generates (abnormal noise).

  Next, the return spring 18 constituting the spring molded body 13 will be described.

  The return spring 18 is provided between the friction pad 7 and the attachment member 2, specifically, between the ear 8 </ b> B of the friction pad 7 (back plate 8) and the pad spring 6 attached to the attachment member 2. ing. The return spring 18 urges the friction pad 7 in the return direction away from the disk 1 and is formed by bending the spring material of the metal plate together with the side push spring 14 and the vibration portion 17. is there.

  The return spring 18 is configured such that the proximal end side is fixed to the back plate 8 of the friction pad 7 and the distal end side elastically contacts the mounting member 2 side on the outer side in the disk radial direction than the proximal end side. That is, the return spring 18 is fixed to the back plate 8 of the friction pad 7 and extends in the disc axial direction so as to face the side surface 8A3 (including the side surfaces of the ear portions 8B and 8C) of the back plate 8 in the disc radial direction. Is formed. For this purpose, the return spring 18 includes a fixed portion 15, an extending portion 19, a contact portion 20, and a protruding piece portion 21.

  The flat fixing portion 15 is fixed to the outer surface 8A2 in the disk axial direction of the friction pad 7 (back plate 8). The fixing portion 15 is positioned by including the circumferential direction of the disk by being caulked and fixed to the protruding portion 11 on the ear portion 8B side of the friction pad 7 (back plate 8). For this purpose, an engagement hole 15 </ b> A that engages with the protruding portion 11 is formed at substantially the center of the fixed portion 15. Accordingly, the spring molded body 13 (return spring 18) is a surface that contacts the friction pad 7 in the fixed portion 15 in a state where the engagement hole 15A of the fixed portion 15 is engaged with the protruding portion 11 of the friction pad 7. Is attached to the friction pad 7 by bringing the pad contact surface 15B into contact with the outer surface 8A2 of the friction pad 7 in the axial direction of the disk and pressing and crimping the protruding portion 11.

  The extending portion 19 is connected to the fixed portion 15 at the base end side, and extends in the direction away from the friction pad 7 along the disc axial direction (outside in the disc axial direction). Specifically, the extended portion 19 extends from the inner end of the fixed portion 15 in the radial direction of the disk toward the outer side in the axial direction of the disk, and the intermediate portion extends toward the outer side in the circumferential direction of the disk (from above in FIG. 5). Look) It is almost L-shaped.

  The abutting portion 20 extends from the extending portion 19 toward the outer side in the disk radial direction, and the tip side elastically abuts against the attachment member 2 via the pad spring 6. Specifically, the contact portion 20 is folded back from a part (the outer portion in the disk circumferential direction) of the distal end side (the outer end portion in the disk axial direction) of the extending portion 19 and comes into contact with the mounting member 2 side. is there.

  The abutting portion includes a rising portion 20A that is bent at an acute angle or a right angle (approximately 45 to 90 degrees) from the distal end side of the extending portion 19 to the outer side in the disk radial direction and the direction approaching the mounting member 2. It is formed by a folded portion 20B that extends from the tip end side of 20A toward the inner side in the disk axial direction, the tip end side is folded back in a U shape, and elastically contacts the mounting member 2 (pad spring 6).

  As a result, the return spring 18 always urges the friction pad 7 (back plate 8) in the return direction away from the disk 1, for example, when the brake operation of the vehicle is released, the friction pad 7 is returned to the return position (initial position, standby). It can be returned stably to (position). In this case, the return spring 18 abuts the attachment member 2 with elasticity on the outer side in the disk radial direction of the abutment portion 20 on the distal end side than the fixed portion 15 on the proximal end side.

  The projecting piece portion 21 protrudes from the other portion on the distal end side of the extending portion 19 and faces the outer surface 8A2 of the friction pad 7 in the disk axial direction with a gap. That is, the projecting piece portion 21 is located on the inner side in the disc circumferential direction with respect to the rising portion 20 </ b> A of the contact portion 20, and protrudes from the tip end side of the extending portion 19 toward the inner side in the disc radial direction. Accordingly, the abutting portion 20 is connected to a part of the distal end side of the extending portion 19 and the protruding piece portion 21 is connected to the other portion. In other words, the contact portion 20 and the projecting piece portion 21 are arranged apart from each other in the disk circumferential direction, and the contact portion 20 is provided at a position closer to the outer side in the disk circumferential direction than the projecting piece portion 21. Yes.

  The projecting piece 21 is formed of a plate-like body that is long in the circumferential direction of the disk, and is formed substantially parallel to the fixed portion 15. That is, the protruding piece 21 faces the outer surface 8 </ b> A <b> 2 in the disk axial direction of the friction pad 7 in a state where the engaging hole 15 </ b> A of the spring molded body 13 is fitted into the protruding portion 11 of the friction pad 7. The projecting piece portion 21 is a presser portion provided to prevent the spring molded body 13 from falling off from the protruding portion 11 of the friction pad 7 when the spring molded body 13 is temporarily placed (temporarily fixed) on the friction pad 7. It constitutes.

  When the spring molded body 13 is temporarily placed on the back plate 8 of the friction pad 7, the fixing tool 22 presses the protruding piece portion 21 of the spring molded body 13 (return spring 18) to cause the spring molded body 13 to move to the friction pad 7. It is something that is temporarily fixed. That is, the fixture 22 suppresses the spring formed body 13 from falling off the protruding portion 11 by pressing the projecting piece 21, or reduces the inclination (positional deviation) of the spring formed body 13 with respect to the friction pad 7. Is. As shown in FIGS. 4 and 5, the fixture 22 is a rod-shaped body made of, for example, a metal material, a resin material, or the like, and includes a pressing portion 22A extending in the disc axial direction, and the friction pad 7 from the inner side in the disc radial direction of the pressing portion 22A. And a positioning protrusion 22B protruding toward the surface.

  Of the pressing portion 22 </ b> A of the fixture 22, the surface facing the disk axial direction outer surface 8 </ b> A <b> 2 of the friction pad 7 is a protruding piece contact surface 22 </ b> A <b> 1 that contacts the protruding piece 21. For this reason, the protrusion piece contact surface 22A1 is formed in substantially the same shape as the protrusion piece 21. In addition, a positioning projection 22B for positioning the fixture 22 is formed on the inner side in the disk radial direction of the projecting piece contact surface 22A1 by contacting the end of the projecting piece 21 in the disk radial direction.

  In the fixing tool 22, the projecting piece contact surface 22 </ b> A <b> 1 contacts the projecting piece portion 21 of the spring molded body 13 (return spring 18) and presses the spring molded body 13 toward the main plate portion 8 </ b> A of the friction pad 7. As a result, the spring molded body 13 is prevented from falling off the protruding portion 11. In this case, the fixing tool 22 can abut the projecting piece portion abutting surface 22A1 and the positioning projection 22B on the projecting piece portion 21, so that the projecting piece portion 21 can be stably pressed.

  The disc brake according to the first 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 4A (cylinder) of the caliper 4 to cause the piston 4D to slide toward the disk 1, thereby causing the inner friction pad 7 to move to the disk. Press one side. At this time, since the caliper 4 receives a pressing reaction force from the disk 1, the entire caliper 4 is slid to the inner side with respect to the arm portion 2A of the mounting member 2, and the outer leg portion 4C is a friction pad on the outer side. 7 is pressed against the other side of the disk 1.

  As a result, the inner and outer friction pads 7 strongly hold the disk 1 rotating in the direction indicated by the arrow A in 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 4D is stopped, so that the inner and outer friction pads 7 are separated from the disk 1 and return to the non-braking state again. At this time, the inner and outer friction pads 7 are stably returned to the return position (initial position, standby position) separated from the disk 1 by the return spring 18.

  At the time of such brake operation or release (during non-braking), the ear portion 8B located on the side of the disk 1 in the ear portions 8B and 8C of the friction pad 7 is pressed by the pressing portion 16 of the side push spring 14. 2, and the friction pad 7 is constantly urged with a weak force toward the delivery side of the disk 1 (in the direction of arrow A in FIG. 2). And the ear | edge part 8C located in the delivery side of the disk 1 is pressed by the back wall surface of the pad guide 3 via the pad spring 6 with the urging | biasing force at this time. For this reason, it is possible to restrict the friction pad 7 from rattling in the circumferential direction of the disk due to vibration or the like when the vehicle travels.

  During braking operation when the vehicle moves forward, the braking torque (rotational torque in the direction of arrow A) received by the friction pad 7 from the disk 1 is received by the arm portion 2A (back wall surface of the pad guide 3) on the delivery side. be able to. As a result, the ear portion 8 </ b> C of the friction pad 7 located on the delivery side of the disk 1 continues to contact the back wall surface of the pad guide 3 via the pad spring 6. Moreover, the ear 8C on the delivery side is pressed against the back wall surface of the pad guide 3 by the urging force of the pressing portion 16 of the side pressing spring 14 before the braking operation, so that the friction pad is applied by the braking torque. It can suppress that 7 moves and abnormal noise (rattle sound) generate | occur | produces.

  Further, the ear portions 8B and 8C of the friction pad 7 are slidably inserted into the pad guides 3 and 3 positioned on the turn-in side and the turn-out side of the disc 1 via the pad spring 6, and the pad spring 6 is inserted. Therefore, the disk 1 is urged outward in the radial direction. Thereby, the ear | edge parts 8B and 8C of the friction pad 7 can be elastically pressed to the disk radial direction outer side. For this reason, it is possible to suppress the friction pad 7 from rattling in the radial direction of the disk 1 due to vibrations during traveling. When the brake is operated, the inner and outer friction pads 7 can be smoothly guided in the axial direction of the disk 1.

  Next, an attaching operation for attaching the spring molded body 13 to the back plate 8 of the friction pad 7 will be described.

  First, the engaging hole 15 </ b> A formed in the fixing portion 15 of the spring molded body 13 is engaged with the protruding portion 11 of the back plate 8, and the spring molded body 13 is temporarily placed on the back plate 8. Next, the spring molded body 13 can be attached to the back plate 8 by crushing (caulking) the protruding portion 11.

  By the way, the engagement hole 15 </ b> A is formed to be slightly larger than the protrusion 11 in order to engage with the protrusion 11 of the back plate 8. Therefore, in the prior art, when the protrusion 11 is caulked, there is a possibility that it is attached in a state of being displaced with respect to the friction pad 7. In addition, the spring molded body 13 temporarily placed on the friction pad 7 may fall off the protrusion 11 before the protrusion 11 of the friction pad 7 is caulked.

  Therefore, as shown in FIGS. 4 and 5, in the present embodiment, a protruding piece portion 21 that is substantially parallel to the disk axial direction outer surface 8 </ b> A <b> 2 of the friction pad 7 is formed on the extending portion 19 of the spring molded body 13 (return spring 18). Provided. Thereby, when the spring molded body 13 is temporarily placed, the spring molded body 13 can be stably fixed to the back plate 8 of the friction pad 7.

  Specifically, the engagement hole 15 </ b> A formed in the fixed portion 15 of the spring molded body 13 is engaged (provisionally placed) with the protruding portion 11 of the friction pad 7. Next, the protruding piece 21 is pressed by the fixture 22 in a state where the inclination (positional deviation) of the spring molded body 13 with respect to the friction pad 7 is reduced. In this case, the spring molded body 13 is stably fixed (temporarily fixed) to the back plate 8 by the projecting piece portion 21 coming into contact with the projecting piece portion contact surface 22A1 of the fixture 22 and the positioning projection 22B. Can do. In this state, the spring molded body 13 can be attached to the back plate 8 of the friction pad 7 by crushing and caulking the protruding portion 11.

  Thus, in the first embodiment, the projecting piece portion 21 for stably fixing the spring molded body 13 to the friction pad 7 is provided on the extending portion 19 of the spring molded body 13 (return spring 18). Thereby, when the spring molded body 13 is temporarily placed on the friction pad 7, it is possible to suppress the spring molded body 13 from falling off the protruding portion 11. Further, the positional deviation of the spring molded body 13 with respect to the friction pad 7 can be made as small as possible, and the spring molded body 13 can be attached to the back plate 8 of the friction pad 7 with high accuracy.

  As a result, the workability and productivity of the mounting work for attaching the spring molded body 13 to the friction pad 7 can be improved. In addition, since the spring molded body 13 can be attached to the friction pad 7 with high accuracy, the side pressing spring 14, the vibrating portion 17, and the return spring 18 provided with the side pressing spring 14, the wear detecting function, and the return spring function are provided. Either function can be improved.

  Next, FIG. 6 and FIG. 7 show a second embodiment. The feature of the second embodiment resides in that a projecting piece portion is provided on the inner side in the disk circumferential direction in the distal end side (the outer end in the disk axial direction) of the extending part of the spring molded body (return spring). In the second embodiment, the same components as those in the first embodiment are denoted by the same reference numerals, and the description thereof is omitted.

  The projecting piece portion 31 protrudes from another portion on the distal end side of the extending portion 19 (a portion different from the portion to which the contact portion 20 is connected) and faces the outer surface 8A2 of the friction pad 7 with a gap. ing. The projecting piece 31 protrudes inward in the disk radial direction from the distal end side (the outer end in the disk axial direction) of the extending part 19 of the spring molded body 13 (return spring 18). The projecting piece 31 is provided on the inner side in the disk circumferential direction in the tip of the extending portion 19. That is, as shown in FIG. 7, the leading end of the extending portion 19 is provided with a rising portion 20A of the contact portion 20 on the outer side in the disk circumferential direction, and has a predetermined gap dimension L from the rising portion 20A to the inner side in the disk circumferential direction. A protruding piece portion 31 is provided.

  The projecting piece portion 31 is formed substantially parallel to the fixed portion 15. That is, the protruding piece 31 faces the outer surface 8 </ b> A <b> 2 of the friction pad 7 in the disk axial direction with a gap in a state where the spring molded body 13 is fitted into the protruding portion 11 of the friction pad 7. The length of the protrusion 31 in the disk circumferential direction is formed to be approximately half the length of the protrusion 21 in the circumferential direction of the first embodiment. The projecting piece portion 31 is a pressing portion provided to prevent the spring molded body 13 from falling off from the protruding portion 11 of the friction pad 7 when the spring molded body 13 is temporarily placed (temporarily fixed) on the friction pad 7. It constitutes.

  When the spring molded body 13 is temporarily placed on the back plate 8 of the friction pad 7, the fixing tool 32 presses the projecting piece portion 31 of the spring molded body 13 (return spring 18) to cause the spring molded body 13 to move to the friction pad 7. It is something that is temporarily fixed. That is, the fixture 32 suppresses the spring formed body 13 from falling off the protruding portion 11 by pressing the projecting piece portion 31, or reduces the inclination (displacement) of the spring formed body 13 with respect to the friction pad 7. Is.

  As shown in FIGS. 6 and 7, the fixture 32 is a rod-shaped body made of, for example, a metal material, a resin material, and the like, and includes a pressing portion 32A extending in the disc axial direction and the friction pad 7 from the outer side in the disc circumferential direction of the pressing portion 32A. And a positioning protrusion 32B protruding toward the surface. That is, the fixture 32 is formed in a stepped shape with the pressing portion 32A and the positioning protrusion 32B by cutting out a part of the substantially rectangular parallelepiped block body in the disk axial direction.

  A surface of the pressing portion 32 </ b> A that faces the outer surface 8 </ b> A <b> 2 of the friction pad 7 in the disk axial direction is a protruding piece contact surface 32 </ b> A <b> 1 that contacts the protruding piece 31. For this reason, the protrusion piece contact surface 32A1 is formed in substantially the same shape as the protrusion piece 31. Further, an end of the protruding piece 31 on the outer side in the disk circumferential direction abuts on the outer side in the disk circumferential direction of the protruding piece contact surface 32A1, and a positioning protrusion 32B that enters the inner surface in the disk radial direction of the extending portion 19 is provided. Is formed.

  In the fixing tool 32, the projecting piece contact surface 32 </ b> A <b> 1 contacts the projecting piece portion 31 of the spring molded body 13 (return spring 18) and presses the spring molded body 13 toward the main plate portion 8 </ b> A of the friction pad 7. As a result, the spring molded body 13 is prevented from falling off the protruding portion 11. In this case, the fixing tool 32 can abut the projecting piece portion abutting surface 32A1 and the positioning projection 32B on the projecting piece portion 31, and can press the projecting piece portion 31 stably.

  Thus, also in the second embodiment, similarly to the first embodiment, when the spring molded body 13 is temporarily placed on the friction pad 7, it is possible to suppress the spring molded body 13 from falling off the protruding portion 11. . Further, the positional deviation of the spring molded body 13 with respect to the friction pad 7 can be made as small as possible, and the spring molded body 13 can be attached to the back plate 8 of the friction pad 7 with high accuracy.

  As a result, the workability and productivity of the mounting work for attaching the spring molded body 13 to the friction pad 7 can be improved. Further, since the spring molded body 13 can be attached to the friction pad 7 with high accuracy, any of the side push function, wear detection function, and return spring function of the spring molded body 13 can be improved.

  Next, FIG. 8 and FIG. 9 show a third embodiment. The feature of the third embodiment resides in that a protruding piece portion is provided adjacent to the rising portion 20A on the distal end side (the outer end portion in the disc axial direction) of the extending portion of the spring molded body (return spring). . Note that in the third embodiment, the same components as those in the first embodiment are denoted by the same reference numerals, and description thereof is omitted.

  The projecting piece 41 protrudes from another portion on the tip end side of the extending portion 19 (a portion different from the portion to which the contact portion 20 is connected) and faces the outer surface 8A2 of the friction pad 7 in the disc axial direction with a gap. ing. The projecting piece 41 protrudes inward in the radial direction of the disk from the distal end side (the outer end in the disk axial direction) of the extension 19 of the spring molded body 13 (return spring 18). The projecting piece 41 is provided so as to be adjacent to the rising portion 20 </ b> A of the contact portion 20 extending from the distal end side of the extending portion 19 toward the outer side in the disk radial direction.

  The protruding piece 41 is formed substantially parallel to the fixed portion 15. That is, the projecting piece 41 faces the outer surface 8 </ b> A <b> 2 of the friction pad 7 in the disk axial direction with a gap in a state where the spring molded body 13 is fitted into the projecting portion 11 of the friction pad 7. The length of the projecting piece 41 in the circumferential direction of the disk is approximately half of the length of the projecting piece 21 of the first embodiment in the circumferential direction of the disk. Further, the projecting piece 41 is located on the outer side in the disk circumferential direction with respect to the projecting piece 31 of the second embodiment. The projecting piece 41 is a presser portion provided to prevent the spring molded body 13 from falling off from the protruding portion 11 of the friction pad 7 when the spring molded body 13 is temporarily placed (temporarily fixed) on the friction pad 7. It constitutes.

  When the spring molded body 13 is temporarily placed on the back plate 8 of the friction pad 7, the fixing tool 42 presses the protruding piece portion 41 of the spring molded body 13 (return spring 18) to cause the spring molded body 13 to move to the friction pad 7. It is something that is temporarily fixed. In other words, the fixture 42 suppresses the spring formed body 13 from falling off the protruding portion 11 by pressing the projecting piece 41, or reduces the inclination (positional deviation) of the spring formed body 13 with respect to the friction pad 7. Is.

  As shown in FIGS. 8 and 9, the fixture 42 is a rod-shaped body made of, for example, a metal material, a resin material, or the like, and includes a pressing portion 42A extending in the disk axial direction, and the friction pad 7 from the inner side in the disk circumferential direction of the pressing portion 42A. And a positioning protrusion 42B protruding toward the surface. That is, the fixing tool 42 is formed in a stepped shape of the pressing portion 42A and the positioning protrusion 42B by notching a part of the substantially rectangular parallelepiped block body in the disk axial direction.

  A surface of the pressing portion 42 </ b> A that faces the outer surface 8 </ b> A <b> 2 in the disk axial direction of the friction pad 7 is a protruding piece contact surface 42 </ b> A <b> 1 that contacts the protruding piece 41. For this reason, the protrusion piece contact surface 42A1 is formed in substantially the same shape as the protrusion piece 41. Further, the end of the protrusion 41 on the inner side in the disk circumferential direction abuts on the inner side in the disk circumferential direction of the protrusion piece contact surface 42A1, and the positioning protrusion 42B that enters the inner surface of the extending portion 19 in the disk radial direction. Is formed.

  In the fixing tool 42, the protruding piece contact surface 42 </ b> A <b> 1 contacts the protruding piece 41 of the spring molded body 13 (return spring 18) and presses the spring molded body 13 toward the main plate portion 8 </ b> A of the friction pad 7. As a result, the spring molded body 13 is prevented from falling off the protruding portion 11. In this case, the fixing tool 42 can abut the projecting piece portion abutting surface 42A1 and the positioning projection 42B against the projecting piece portion 41, so that the projecting piece portion 41 can be stably pressed.

  Thus, in the third embodiment as well, as in the first embodiment, when the spring molded body 13 is temporarily placed on the friction pad 7, it is possible to suppress the spring molded body 13 from falling out of the protruding portion 11. . Further, the spring molded body 13 can be attached to the back plate 8 of the friction pad 7 by minimizing the displacement of the spring molded body 13 with respect to the friction pad 7 as much as possible.

  As a result, the workability and productivity of the mounting work for attaching the spring molded body 13 to the friction pad 7 can be improved. In addition, since the spring molded body 13 can be attached to the friction pad 7 with high accuracy, all of the functions of the side push function, wear detection function, and return spring mechanism provided in the spring molded body 13 can be improved.

  In the above-described first embodiment, the case where the protruding piece portion 21 protrudes from the extending portion 19 toward the inner side in the disk radial direction has been described as an example. However, the present invention is not limited to this, and for example, the protruding piece portion may protrude from the extending portion toward the outside in the disk radial direction. The same applies to the second and third embodiments.

  In the embodiment, the spring molded body 13 has a return spring function (return spring 18) for returning the friction pad 7 to the return position separated from the disk 1, and a side pushing function for pressing the friction pad 7 toward the disk circumferential direction. The description has been given by taking as an example a combination of the three functions of the (side push spring 14) and the wear detection function (vibration unit 17) that warns the wear limit of the lining 9. However, the present invention is not limited to this, and for example, a spring molded body includes at least only a return spring function. As another embodiment, a spring molded body having only a side pushing function among the above three functions is also conceivable. In the case of this embodiment, the extension portion 19 in the first to third embodiments described above extends from the outer circumferential end of the fixed portion 15 to the outer side in the disc axial direction, like the bent piece portion 16A. The protrusion is bent from the leading end side of the protruding portion and is formed to be substantially parallel to the fixed portion 15.

  In the embodiment, the case where the spring molded body 13 (side push spring 14 and return spring 18) is configured as a plate spring made of a metal plate has been described as an example. However, the present invention is not limited to this. For example, various springs formed of a material other than a metal plate (for example, a resin material) can be used as the return spring and the side push spring.

  In the embodiment, the case where one piston 4D is provided on the inner leg 4A of the caliper 4 has been described as an example. However, the present invention is not limited to this. For example, a twin bore configuration in which two pistons are provided on the inner leg portion of the caliper may be employed, or a configuration in which three or more pistons are provided on the inner leg portion of the caliper may be employed.

  In the embodiment, a so-called floating caliper type in which the piston 4D is slidably provided on the inner leg portion 4A of the caliper 4 through the cylinder and the outer leg portion 4C of the caliper 4 is brought into contact with the friction pad 7 on the outer side. As an example, the disc brake was described. 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 the caliper.

DESCRIPTION OF SYMBOLS 1 Disc 2 Mounting member 4 Caliper 7 Friction pad 8 Back plate 8A Main plate part 8A2 Disc axial direction outer surface 13 Spring molding 15 Fixing part 15B Pad contact surface 18 Return spring 19 Extension part 20 Contact part 21,31,41 Projection One part

Claims (1)

An attachment member that is attached to the vehicle across the outer circumferential side of the disk in the axial direction of the disk, and that slidably supports at least a pair of friction pads disposed on both surfaces of the disk;
A caliper that is slidably provided on the mounting member and presses the pair of friction pads against both surfaces of the disk;
A spring molded body that is fixed to the friction pad and elastically displaces the friction pad with respect to the mounting member by contacting the mounting member;
The spring molded body is:
A fixing portion that is provided on one end side and has a surface that comes into contact with the friction pad, and is fixed by caulking;
A base end side connected to the fixed portion, and a tip end side extending in a direction away from the friction pad along the axial direction of the disc; and
A contact portion that is folded back from a part of the distal end side of the extension portion and contacts the mounting member side;
A disc brake comprising a projecting piece portion that protrudes from another portion on the distal end side of the extension portion and faces the outer surface in the disc axial direction of the friction pad with a gap.

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