JP5714384B2 - 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 composed of a back plate and a lining (friction material) bonded (fixed) to the surface of the back plate, and friction pressed against the disc by supplying hydraulic pressure to the caliper. A pad, a shim plate for preventing brake squeal attached to the back side of the back of the friction pad, and a back of the friction pad, and when the lining is worn to a predetermined portion (for example, wear limit) A sensor plate that warns when the friction pad is replaced (that the lining has reached the wear limit) by generating sound in contact with the disk is provided (see, for example, Patent Document 1).

  When a driver or the like of a vehicle performs a brake operation, for example, a piston provided in the caliper is slid to the disk side by supplying hydraulic pressure from the outside, and the friction pad is pressed toward the disk by the piston. A braking force is applied to the disc. When the lining wears up to a preset part (wear limit) with long-term use, etc., a noise is generated when the sensor plate and the disk come into contact with each other. An alarm can be given that the lining has been reached (the lining has reached the wear limit).

JP 7-54889 A

  In the case of the conventional technology described above, the sensor plate may rattle with respect to the back plate, and the sensor plate may become unstable. In addition, there is a problem that the sensor plate and the shim plate interfere when the sensor plate and the shim plate need to be arranged close to each other due to the size and shape of the back plate.

  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 secure the attachment strength of the sensor plate to the back plate and to suppress the interference between the sensor plate and the shim plate. To provide a disc brake.

  In order to solve the above-mentioned problems, the present invention provides a friction pad comprising a back plate and a lining bonded to the surface of the back plate, and a shim plate for preventing brake noise that is attached to the back side of the back plate of the friction pad. And a sensor plate that is attached to the back plate of the friction pad and that generates a sound in contact with the disc to alert the wear limit of the lining.

  A feature of the configuration adopted by the invention of claim 1 is that a protrusion for positioning the sensor plate on the back plate is provided on the back side of the side edge portion of the back plate, A sandwiching portion that is formed in a U-shaped cross-section that can be inserted into the side edge of the back plate and has two opposing pieces that sandwich the side edge, and has a U-shaped cross section on the back side of the back plate from the sandwiching portion. The back plate is configured to include a spring portion formed by turning and a vibrating portion linearly extending from the spring portion toward the disk, and one of the opposing pieces of the clamping portion includes the opposing plate. An engagement hole that is engaged with the protrusion, and a protrusion that protrudes toward the other opposing piece of the clamping portion, which is disposed at a position on one side in the radial direction of the disk across the engagement hole, The other opposing piece disposed at the other radial position of the disk on the opposite side of the convex portion across the engagement hole Provided a recess formed recessed et away direction, the convex portion is to be configured larger than the thickness of the protruding length of the shim plate.

  ADVANTAGE OF THE INVENTION According to this invention, while being able to ensure the attachment intensity | strength with respect to the back plate of a sensor board, it can suppress that a sensor board and a shim board interfere.

It is the top view which looked at the disk brake by embodiment of this invention from the upper side. It is the front view which looked at the disc brake from the outer side (lower side of FIG. 1). It is a front view which expands and shows the friction pad, shim board, and sensor board in FIG. It is the enlarged view which looked at the friction pad, the shim board, and the sensor board from the arrow IV-IV direction in FIG. It is the enlarged view which looked at the friction pad, the shim board, and the sensor board from the arrow VV direction in FIG. It is sectional drawing which looked at the friction pad, the shim board, and the sensor board from the arrow VI-VI direction in FIG. It is sectional drawing which looked at the friction pad, the shim board, and the sensor board from the arrow VII-VII direction in FIG. It is sectional drawing which looked at the friction pad, the shim board, and the sensor board from the arrow VIII-VIII direction in FIG. It is a perspective view which shows a sensor plate by itself.

  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 in the direction of arrow A together with wheels (not shown) when the vehicle travels in the forward direction, for example, and rotates in the direction of arrow B when the vehicle moves backward. It is.

  The attachment member 2 is attached to a non-rotating part of the vehicle. As shown in FIG. 1, the mounting member 2 includes a pair of arms 2A and 2A extending in the axial direction of the disc 1 so as to be spaced apart in the rotational direction (circumferential direction) of the disc 1 and straddle the outer periphery of the disc 1. The base end side of each arm portion 2A is connected so as to be integrated, and is roughly constituted by a thick support portion 2B fixed to a non-rotating portion of the vehicle at a position on the inner side of the disc 1. Has been.

  The mounting member 2 is integrally formed with a reinforcing beam 2C that connects the distal ends of the arms 2A 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 at an intermediate portion in the axial direction of the disc 1 of each arm portion 2A of the mounting member 2. Inner side and outer side pad guides 3 and 3 are formed on both sides of the disc path portion of the mounting member 2 (both sides in the axial direction of the disc 1). Each of these pad guides 3 is formed as a concave groove having a U-shaped cross section, and extends in a direction in which a friction pad 6 described later slides, that is, in the axial direction of the disk 1.

  Each pad guide 3 guides the friction pad 6 in the axial direction of the disk 1 through the ears 7B and 7C of the back plate 7 constituting the friction pad 6. For this reason, the ears 7B and 7C of the friction pad 6 (back plate 7) are concavo-convexly fitted to each pad guide 3 so as to be sandwiched from above and below (the radial direction of the disk 1).

  The back side wall surface of each pad guide 3 constitutes a torque receiving surface 4 as a so-called torque receiving portion. The torque receiving surface 4 receives the braking torque generated during the brake operation via the ear portions 7B and 7C of the friction pad 6.

  A caliper 5 is slidably provided on the mounting member 2. The caliper 5 extends from the inner leg portion 5A to the disc 1 so as to straddle the outer peripheral side of the disc 1 between the inner leg portion 5A provided on the inner side which is one side of the disc 1 and each arm portion 2A of the mounting member 2. A bridge portion 5B extending to the outer side, which is the other side, and a radially inward direction of the disk 1 from the outer side, which is the tip side of the bridge portion 5B, and the tip side is a bifurcated claw portion. The outer leg portion 5C.

  The inner leg 5A of the caliper 5 is formed with a cylinder (not shown) into which a piston 5D (see FIG. 2) is slidably fitted. Further, as shown in FIG. 1, the inner leg 5A is integrally provided with a pair of mounting portions 5E and 5E that protrude in the circumferential direction of the disc 1 (left and right in FIG. 1). Each of these attachment portions 5E, 5E supports the caliper 5 slidably on each arm portion 2A of the attachment member 2 via a slide pin (not shown).

  The inner side and outer side friction pads 6, 6 are arranged to face both side surfaces of the disk 1 in the axial direction. Each of these friction pads 6 is provided by bonding (adhering) to a flat plate 7 extending in the circumferential direction (rotation direction) of the disk 1 and the surface 7A side of the disk 7 (surface direction of the disk 1 in the axial direction). And a lining 8 (see FIG. 4) as a friction material in frictional contact with the side surface. The back plate 7 can be formed of metal, resin, or the like.

  The back plate 7 of the friction pad 6 is provided with ears 7B and 7C having convex shapes located on the side edges on both sides of the disc 1 in the circumferential direction (both left and right sides in FIGS. 2 and 3). Is provided. Each of these ear portions 7B and 7C constitutes a torque transmitting portion that transmits the braking torque received by the friction pad 6 from the disc 1 to the torque receiving surface 4 of the mounting member 2 when the vehicle is braked.

  The ear portions 7B and 7C of the friction pad 6 (back plate 7) are formed symmetrically to the left and right as shown in FIGS. 2 and 3, for example, and have the same shape. One ear portion 7B (to the right in FIGS. 2 and 3) is arranged on the inlet side (turn-in side) of the disc 1 that rotates in the direction of arrow A when the vehicle moves forward, and the other (FIG. 2 and FIG. 3). 3C (left side of 3) is arranged on the rotational direction exit side (outward side) of the disk 1. A sensor plate 21, which will be described later, is attached to one of the ears 7B and 7C that is located on the side where the disk 1 is turned in.

  The back plate 7 of the friction pad 6 is provided with projections 9, 9 that are located closer to the base end (root) side of the respective ear portions 7 B, 7 C. Each of these protrusions 9 is provided so as to protrude on the back surface 7D (surface opposite to the surface 7A on which the lining 8 is provided, the back surface) side, and the cross-sectional shape thereof is non-circular. Specifically, as shown in FIG. 8, it is formed in a substantially oval shape (track shape) composed of a pair of linear portions 9A, 9A and a pair of semicircular arc portions 9B, 9B. One of the protrusions 9 located on the side of the disk 1 is for positioning a sensor plate 21 (described later) with respect to the back plate 7. That is, as shown in FIG. 8, the engagement hole 22 </ b> D of the sensor plate 21 is engaged (fitted) with one protrusion 9.

  Notches 10 and 10 are provided in the ear portions 7B and 7C of the back plate 7, respectively. Each of these notches 10 is formed by partially cutting the end faces (projecting sides) of the ear portions 7B and 7C into an L shape. Each notch 10 is disposed at a position closer to the outer side in the radial direction than the center position in the width direction (the radial direction of the disk 1) of the ear portions 7B and 7C. Of the respective notches 10, the notch 10 positioned on the side of the disk 1 forms a storage gap for storing a part of a sensor plate 21 described later.

  A squeal prevention shim plate 11 (only the outer side shim plate 11 is shown) is detachably attached to the inner side and outer side friction pads 6 on the back surface 7D side of the back plate 7. The outer side shim plate 11 is disposed between the outer leg portion 5C of the caliper 5 and the back plate 7, and prevents the two from coming into direct contact with each other, thereby suppressing the occurrence of so-called brake squealing between the two. Is. On the other hand, the shim plate on the inner side is disposed between the piston 5D inserted into the inner leg 5A of the caliper 5 and the back plate 7, and prevents the two from coming into direct contact with each other. This suppresses the occurrence of brake squeal.

  The shim plate 11 is formed as a single piece by pressing a stainless steel plate having a thickness smaller than that of the back plate 7 and having spring properties. As shown in FIG. 3, the shim plate 11 includes a flat plate portion 11A, three attachment claw portions 11B, 11C, and 11C, and two protruding plate portions 11D and 11D. Of these, the flat plate portion 11 </ b> A is formed as a substantially fan-shaped flat plate extending in the circumferential direction and the radial direction of the disk 1 along the back surface 7 </ b> D of the back plate 7.

  Of the three attachment claws 11B and 11C, one attachment claw 11B is provided on the peripheral edge of the flat plate portion 11A so as to protrude outward in the radial direction of the disk 1 from the peripheral edge, and the remaining two The attachment claw portions 11C and 11C are provided on the peripheral edge portion of the flat plate portion 11A so as to protrude inward in the radial direction of the disk 1 from the peripheral edge portion. The front end sides of these mounting claws 11B and 11C are formed to be bent in a substantially S shape or a substantially U shape, and the front end side is slidably locked to the peripheral edge portion of the back plate 7. As a result, the rotational force from the disk 1 is transmitted to the friction pad 6 during the brake operation, and even when the friction pad 6 is displaced in the rotation direction of the disk 1, the shim plate 11 is slidably displaced with respect to the back plate 7. Thus, it is possible to prevent the rotational force at this time from being transmitted to the caliper 5 or the piston 5D side. In the present embodiment, the number of mounting claws is three. However, the present invention is not limited to this, and two or more are provided as long as one or more are provided on each of the radially outer side and the radially inner side of the disk 1. May be.

  The two protruding plate portions 11D protrude toward the tip side (protruding side) of the respective ear portions 7B and 7C at positions corresponding to the ear portions 7B and 7C of the back plate 7 in the peripheral portion of the flat plate portion 11A. It is provided to do. As shown in FIG. 4 and FIG. 7, the protruding plate portion 11 </ b> D located on the side of the disk 1 in the protruding plate portions 11 </ b> D is between a recess 22 </ b> F of the sensor plate 21 and a back surface 7 </ b> D of the back plate 7. It has entered the gap 23. When the shim plate 11 is slidably displaced with respect to the back plate 7 during the brake operation, for example, the protruding plate portion 11D or the vicinity thereof abuts against the protrusion 9 of the back plate 7 to restrict the sliding displacement. it can.

  Pad springs 12 and 12 (see FIGS. 1 and 2) are attached to each arm 2A of the attachment member 2, respectively. These pad springs 12 elastically support the friction pads 6 on the inner side and the outer side, respectively, and smooth the sliding displacement of the friction pads 6. The pad spring 12 is formed by bending (press molding) a stainless steel plate having spring properties.

  The pad spring 12 includes a pair of guide plate portions 12A, a connecting plate portion 12B, and a radial biasing plate portion 12C. The pair of guide plate portions 12A is formed to be bent in a substantially U shape so as to be fitted in each pad guide 3 of the mounting member 2, and is formed to be separated from each other on the inner side and the outer side of the disc 1. ing.

  The connecting plate portion 12B is formed to extend in the axial direction while straddling the outer peripheral side of the disc 1 in order to integrally connect the guide plate portions 12A on the inner side and the outer side of the disc 1. The radial urging plate portion 12C is integrally formed at the radially inner portion of the disk 1 of each guide plate portion 12A.

  Each guide plate portion 12A of the pad spring 12 is fitted and mounted in each pad guide 3 of the mounting member 2, and the back plate 7 of the friction pad 6 is attached to the disc 1 via the convex ear portions 7B and 7C. It has a function of guiding in the axial direction. Each radial urging plate portion 12 </ b> C elastically contacts the ear portions 7 </ b> B and 7 </ b> C of each friction pad 6 (back plate 7) in each pad guide 3 of the mounting member 2, thereby back of each friction pad 6. The plate 7 is urged toward the radially outer side of the disk 1. Thereby, the friction pad 6 can be smoothly guided in the axial direction of the disk 1 along the guide plate portion 12A during the brake operation while suppressing the rattling of each friction pad 6.

  Next, the sensor plate 21 for notifying the driver or the like that the replacement time of the friction pad 6 has come will be described.

  This sensor plate 21 is a side edge portion (ear portion) that becomes the disk entry side when the vehicle moves forward among the side edge portions (ear portions 7B, 7C) of the back plate 7 constituting the friction pad 6 on the inner side and the outer side. 7B) and the torque receiving surface 4 of the mounting member 2 opposite to this. Here, when the lining 8 of the friction pad 6 is worn to a predetermined portion (wear limit) set in advance, the sensor plate 21 comes into contact with the disc 1 as shown in FIG. By generating a sound, the driver or the like has a function to warn that it is time to replace the friction pad 6, that is, that the lining 8 has reached the wear limit. The sensor plate 21 also has a function as an urging means for urging the friction pad 6 toward the unwinding side of the disk 1 by a later-described spring portion 24 in addition to warning the replacement timing of the friction pad 6. is there.

  The sensor plate 21 is formed, for example, by bending (press forming) a stainless steel plate having spring properties. The sensor plate 21 is roughly constituted by a clamping part 22, a spring part 24, and a vibration part 25, and the clamping part 22, the spring part 24, and the vibration part 25 are integrally formed.

  The sandwiching portion 22 of the sensor plate 21 is formed in a U-shaped cross section that can be inserted into one ear portion 7 </ b> B that is a side edge portion of the back plate 7. The clamping portion 22 includes two opposing pieces 22A and 22B for clamping the ear portion 7B from both sides in the thickness direction (front and back direction in FIG. 3, upper and lower directions in FIGS. 4 to 6), and both opposing pieces 22A, And a connecting piece 22C for connecting 22B in the thickness direction.

  One of the opposing pieces 22A and 22B of the sandwiching portion 22 that is disposed on the back surface 7D side of the back plate 7 is formed in a substantially rectangular shape, and the back plate 7 (ear portion 7B) is formed in the center thereof. Engagement holes 22D that are engaged (fitted) to the projections 9 are provided penetrating. As shown in FIG. 8, the engagement hole 22D is a non-circular hole substantially the same as the cross-sectional shape of the projection 9 of the ear portion 7B, more specifically, a pair of linear portions 22D1 and a pair of semicircular arc portions. It is formed as a substantially oval hole composed of 22D2. Since the engagement holes 22D and the protrusions 9 are formed in a non-circular shape (substantially oval), the positioning accuracy of the sensor plate 21 with respect to the back plate 7 is ensured, rattling of the sensor plate 21 is prevented, and the engagement is achieved. Interference between the peripheral edge of the hole 22D and the edge of the protrusion 9 can be prevented.

  One opposing piece 22A is provided with a convex portion 22E and a concave portion 22F so as to sandwich the engaging hole 22D. Among these, the convex portion 22E is disposed at a position on the radial direction one side (outside) of the disc 1 with the engagement hole 22D interposed therebetween, and is directed toward the other facing piece 22B of the clamping portion 22 (the back surface of the back plate 7). 7D projecting (in a direction approaching 7D). The protruding height (length) of the convex portion 22 </ b> E of the one opposing piece 22 </ b> A is formed larger than the thickness of the shim plate 11. Moreover, the convex part 22E clamps the ear | edge part 7B between the bending claw parts 22H of the other opposing piece 22B. When the ear portion 7B is sandwiched, the top portion of the convex portion 22E of one opposing piece 22A extends linearly in the radial direction of the disk 1 and makes line contact with the back surface 7D of the ear portion 7B. The top of the bent claw portion 22H of the other opposing piece 22B also extends linearly in the radial direction of the disk 1 and makes line contact with the surface 7A of the ear portion 7B. Thereby, the sensor board 21 can be attached with the attitude | position stable with respect to the ear | edge part 7B.

  The concave portion 22F of the one opposing piece 22A is disposed at the other radial (inner side) position of the disk 1 on the opposite side of the convex portion 22E across the engagement hole 22D, and the other opposing piece 22B of the holding portion 22 is disposed. It is formed to be recessed in the direction away from the. With the sensor plate 21 attached to the ear portion 7B, the protruding height (length) is provided by the convex portion 22E between the concave portion 22F of one opposing piece 22A and the back surface 7D of the back plate 7 (ear portion 7B). ) Minute gap 23 is formed. The protruding plate portion 11D of the shim plate 11 enters the gap 23, thereby preventing the sensor plate 21 and the protruding plate portion 11D of the shim plate 11 from interfering with each other.

  One end side of the connecting piece 22C constituting the sandwiching portion 22 is connected to one opposing piece 22A, from the back surface 7D side to the front surface 7A side of the back plate 7, and to the disk 1 through the notch 10 of the ear portion 7B. It extends in the direction of approaching. Further, the other end side of the connecting piece 22C extending to the front surface 7A side of the back plate 7 is connected to the other facing piece 22B. As shown in FIG. 8, the connecting piece 22C (and the other opposing piece 22B) has its width dimension X1 set to about 1/2 to 2/3 of the width dimension X2 of one opposing piece 22A.

  An extending piece 22G is provided at a portion of the one opposing piece 22A that is displaced radially inward from the position where the connecting piece 22C is connected. The extending piece 22G extends from the one opposing piece 22A toward the distal end side of the ear portion 7B, and the distal end side thereof is bent in a direction approaching the back surface 7D of the ear portion 7B. For example, when the sensor plate 21 tends to be inclined toward the inner side in the radial direction of the disk 1 or the turn-in side, the extending piece 22G comes into contact with the back surface 7D of the ear portion 7B. Thereby, the extension piece 22 </ b> G can prevent the sensor plate 21 from further tilting and suppress the sensor plate 21 from rattling against the back plate 7.

  The other opposing piece 22B that constitutes the sandwiching portion 22 is connected to the other end side of the connecting piece 22C and extends along the surface 7A of the back plate 7 from the other end side. The other opposing piece 22B is provided with a bent claw portion 22H which is bent toward the one opposing piece 22A (in a direction approaching the surface 7A of the back plate 7). As shown in FIG. 9, the separation distance Y1 between the tip of the bent claw portion 22H of the other opposing piece 22B and the tip of the convex portion 22E of the one opposing piece 22A is in a free state (the sensor plate 21 is attached to the ear portion 7B). The thickness is set to be smaller than the thickness Y2 (see FIG. 6) of the back plate 7 (ear portion 7B) in the previous elastic deformation state.

  That is, the separation distance Y1 between the other facing piece 22B and the one facing piece 22A has a margin for the thickness Y2 of the back plate 7 (ear portion 7B). Thereby, when the ear | edge part 7B is pinched | interposed between one opposing piece 22A and the other opposing piece 22B, sufficient attachment strength with respect to the back plate 7 of the sensor board 21 can be ensured, and the sensor board 21 is provided. Shaking with respect to the back plate 7 can be suppressed.

  The spring portion 24 that constitutes the sensor plate 21 is formed by turning from the sandwiching portion 22 to the back surface 7D side of the back plate 7 in a U-shaped cross section. The spring portion 24 includes a rising portion 24A, a folded portion 24B, and a contact portion 24C.

  The rising portion 24A is connected to a portion of the one opposing piece 22A opposite to the connecting piece 22C across the engagement hole 22D, and extends in a direction away from the back surface 7D side of the back plate 7. The folded portion 24B is connected to the leading end side of the rising portion 24A, and is folded in a U shape toward the disk 1 on the back surface 7D side of the back plate 7.

  The contact portion 24C is connected to the front end side of the folded portion 24B, and extends from the front end side to the front surface 7A side of the back plate 7 in a direction approaching the disk 1. The abutting portion 24C extends toward the disk 1 without changing the width dimension (constantly), with a tapered dimension 24C1 that decreases in width (the left and right dimensions in FIG. 5) as it approaches the disk 1. The same width portion 24C2. The contact portion 24C is provided with a protruding portion 24C3 extending from the tapered portion 24C1 to the same width portion 24C2.

  The abutting portion 24C (projecting portion 24C3) abuts (elastically contacts) the torque receiving surface 4 of the attaching member 2 in an elastically deformed state via the guide plate portion 12A of the pad spring 12 in the attached state shown in FIG. . 3 to 9 show a state in which the spring portion 24 is elastically deformed by the contact portion 24C contacting the torque receiving surface 4 via the pad spring 12, and the phantom line ( The alternate long and two short dashes line) shows the spring portion 24 in a free state (a state where it is not elastically deformed).

  The spring portion 24 of the sensor plate 21 urges the friction pad 6 toward the delivery side of the disk 1 by the contact portion 24 </ b> C elastically contacting the torque receiving surface 4 via the pad spring 12. Thereby, it is possible to prevent the friction pad 6 from rattling in the circumferential direction of the disk 1 due to vibrations or the like during traveling of the vehicle, and to reduce brake squeal (slight squeal) during slow braking.

  The vibration part 25 constituting the sensor plate 21 extends linearly from the distal end side of the spring part 24 (contact part 24C) toward the disk 1. When the lining 8 of the friction pad 6 is worn to a predetermined portion (wear limit) set in advance, the vibrating portion 25 generates a sound by vibrating in contact with the axial side surface (surface) of the disk 1. Is.

  That is, as shown in FIG. 4, when the position of the disk 1 at the time of braking approaches the back plate 7 to the position indicated by the two-dot chain line due to wear of the lining 8, the tip of the vibrating portion 25 is A sound is generated in contact with the side surface of 1. Thereby, it is possible to warn the driver or the like that it is time to replace the friction pad 6 (that the lining 8 has reached the wear limit).

  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 5A (cylinder) of the caliper 5 to cause the piston 5D to slide and displace toward the disk 1, whereby the inner friction pad 6 is moved to the disk. Press one side. 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. 6 is pressed against the other side of the disk 1.

  As a result, the inner and outer friction pads 6 cause the disk 1 rotating, for example, in the direction indicated by the arrow A in FIG. 1 and FIG. The disc 1 can be held and a braking force can be applied to the disc 1. When the brake operation is released, the hydraulic pressure supply to the piston 5D is stopped, so that the inner and outer friction pads 6 are separated from the disk 1 and return to the non-braking state again.

  At the time of such brake operation or release (during non-braking), the ear portion 7B of the friction pad 6 on the turn-in side of the disc 1 is moved by the spring portion 24 of the sensor plate 21. 2 is urged in the direction C in FIG. 2, and the friction pad 6 is always urged by a weak force toward the delivery side of the disk 1 (the direction of arrow A in FIG. 2). And the ear | edge part 7C located in the delivery side of the disk 1 is elastically pressed against the torque receiving surface 4 of the pad guide 3 through the guide plate part 12A of the pad spring 12 by the biasing force at this time.

  For this reason, the friction pad 6 is prevented from rattling in the circumferential direction of the disk 1 due to vibrations or the like during traveling of the vehicle by the sensor plate 21 provided between the ear portion 7B on the turn-in side of the disk 1 and the torque receiving surface 4. can do. During braking operation when the vehicle moves forward, the braking torque (rotation torque in the direction of arrow A) received by the friction pad 6 from the disk 1 is received by the arm portion 2A (torque receiving surface 4 of the pad guide 3) on the delivery side. I can accept it.

  Thus, the ear portion 7C of the friction pad 6 located on the delivery side of the disk 1 continues to contact the torque receiving surface 4 of the pad guide 3 via the guide plate portion 12A. In addition, the feeding-side ear portion 7C abuts on the guide plate portion 12A by the urging force of the spring portion 24 of the sensor plate 21 before the brake operation, and there is no clearance (gap). It can be prevented that the friction pad 6 moves and abnormal noise is generated. Thereby, the brake squeal (low pressure squeal) at the time of slow braking can be prevented.

  On the other hand, when the lining 8 of the friction pad 6 is worn to a predetermined portion (wear limit) set in advance for a long period of use or the like, the position of the disk 1 during braking is indicated by a two-dot chain line as shown in FIG. The back plate 7 is approached to the position indicated by. In this case, the tip of the vibration part 25 of the sensor plate 21 comes into contact with the side surface (surface) of the disk 1, and sound is generated from the sensor plate 21. Thereby, it is possible to notify the driver or the like that it is time to replace the friction pad 6.

  According to the present embodiment, the sandwiching portion 22 of the sensor plate 21 is formed in a U-shaped cross section having two opposing pieces 22A and 22B that sandwich the side edge portion (ear portion 7B) of the back plate 7. The one opposing piece 22A is provided with a convex portion 22E and a concave portion 22F across the engagement hole 22D, and the protruding length of the convex portion 22E is made larger than the thickness of the shim plate 11. For this reason, while being able to ensure the attachment intensity | strength with respect to the back plate 7 of the sensor board 21, it can suppress that the sensor board 21 and the shim board 11 interfere.

  That is, the sensor plate 21 engages the engagement hole 22D of the one opposing piece 22A with the protrusion 9 of the back plate 7, and the convex portion 22E of the one opposing piece 22A and the bent claw portion 22H of the other opposing piece 22B. Can be attached to the back plate 7 with high attachment strength. In this case, since the convex portion 22E of one opposing piece 22A and the bent claw portion 22H of the other opposing piece 22B are in line contact with the front surface 7A and the back surface 7D of the back plate 7, respectively, the flatness of the back plate 7 Even if it is not good, the influence can be suppressed. Specifically, even if the flatness of the back plate 7 is not good, the clamping force (mounting strength) by the facing pieces 22A and 22B can be secured, and the positioning accuracy of the sensor plate 21 can be secured. The sensor plate 21 can be attached in a stable posture.

  Moreover, since the one opposing piece 22A is configured to engage the engagement hole 22D with the protrusion 9 of the back plate 7, for example, the sensor plate 21 is compared with a structure in which the sensor plate is fixed to the protrusion by caulking. It is possible to reduce the number of assembling steps for the back plate 7 (elimination of the crimping process) and facilitate the assembling work (improvement of assembling performance). In particular, in the case where the sensor plate is fixed to the protrusion by caulking, there is a possibility that the positioning accuracy of the sensor plate is deteriorated due to caulking failure, the posture of the sensor plate is shifted, the sensor plate is deformed, and the like.

  On the other hand, in the case of the present embodiment, the engaging hole 22D is engaged with the protrusion 9 of the back plate 7, and the convex portion 22E of one opposing piece 22A and the bent claw portion of the other opposing piece 22B. Since the back plate 7 is sandwiched between 22H, the number of assembly processes is reduced, the assembly work is facilitated, the positioning accuracy of the sensor plate is improved, the posture of the sensor plate is stabilized, It is possible to prevent deformation of the sensor plate.

  The sensor plate 21 sandwiches the back plate 7 (ear portion 7B) between the convex portion 22E of one opposing piece 22A and the bent claw portion 22H of the other opposing piece 22B, and includes the engagement hole 22D and the protrusion 9. It is set as the structure attached to the backplate 7 using two fixing means with engaging. For this reason, it is possible to further reduce the backlash of the sensor plate 21 with respect to the back plate 7. Thereby, for example, friction between the spring portion 24 and the pad spring 12 due to the rattling of the sensor plate 21 can be reduced, and durability of the sensor plate 21 and the pad spring 12 can be increased.

  The support strength of the sandwiching portion 22 constituting the sensor plate 21 with respect to the back plate 7 is adjusted by adjusting the protruding dimension (height) of the convex portion 22E of one opposing piece 22A, that is, sandwiching the back plate 7 with respect to the thickness Y2. By adjusting the tightening allowance (separation dimension Y1) of the portion 22, it can be easily adjusted. For this reason, desired support strength can be obtained stably. Further, with respect to the change in the thickness Y2 of the back plate 7, the protruding dimension (separation dimension Y1) of the convex portion 22E of one opposing piece 22A, the angle formed by the opposing piece 22A and the connecting piece 22C, and the connecting piece 22C and This can be dealt with by adjusting the angle between the opposing piece 22B and the like. Therefore, the sensor plate 21 has various sizes, shapes, types, and the like by adjusting the protruding dimension (separation dimension Y1) of the convex part 22E, adjusting the dimension of the spring part 24 (adjusting the spring constant), and the like. The disc brake can be assembled to ensure versatility.

  In addition, since the desired support strength can be stably obtained, the degree of freedom in designing the sensor plate 21 can be improved. That is, for example, the contact piece 24C of the spring portion 24 may be shifted (displaced) in the radial direction of the disk 1 (left and right in FIG. 5) with respect to the center of the one opposing piece 22A. The spring portion 24 of the sensor plate 21 can apply a desired elastic force (biasing force) to the friction pad 6. Thereby, rattling of the friction pad 6 and brake squeal (low pressure squeal) during slow braking can be effectively prevented.

  When the sensor plate 21 is assembled to the back plate 7, the engagement hole 22D of one opposing piece 22A is engaged with the protrusion 9 of the back plate 7, and the bent claw portion 22H of the other opposing piece 22B is engaged with the back plate 7. The front surface 7A side is locked. At this time, the other facing piece 22B can be easily locked to the front surface 7A side of the back plate 7 by the lever principle using the convex portion 22E of the one facing piece 22A as a fulcrum, for example. For this reason, also from this surface, it is possible to facilitate the assembly work of the sensor plate 21 and to improve the assembly performance.

  Furthermore, one opposing piece 22A is provided with a concave portion 22F on the opposite side of the convex portion 22E across the engagement hole 22D, and a gap 23 between the concave portion 22F and the back surface 7D of the back plate 7 is provided in the shim plate 11 The protruding plate portion 11D is configured to enter. Therefore, interference between the shim plate 11 and the sensor plate 21 can be suppressed, and the degree of freedom of the shape of the shim plate 11 and the position where the sensor plate 21 is provided, that is, the degree of freedom of design (layout) is improved. Can do.

  In addition, the shim plate 11 can be positioned (position regulation) by contact with the protrusion 9. That is, the protruding plate portion 11D of the shim plate 11 or the vicinity thereof abuts against the straight portion 9A or the semicircular arc portion 9B of the protrusion 9 to prevent the shim plate 11 from rattling. Thereby, the friction between the shim plate 11 and the back surface 7D of the back plate 7 due to the shakiness of the shim plate 11 can be reduced, and the durability of the shim plate 11 can also be improved.

  According to the present embodiment, the engagement hole 22D is formed as a non-circular hole having an oval shape, and the engagement hole 22D is configured to engage with the projection 9 having an oval cross section. For this reason, it is possible to secure the positioning accuracy of the sensor plate 21 with respect to the back plate 7 and prevent the sensor plate 21 from rattling by the engagement between the engagement holes 22D and the protrusions 9. In addition, it is possible to prevent interference between the peripheral edge of the engagement hole 22D and the edge of the protrusion 9.

  In the above-described embodiment, the case where the sensor plate 21 is configured to be attached to the ear portion 7B of the back plate 7 has been described as an example. However, the present invention is not limited thereto. For example, as described in Patent Document 1, the ear portion of the side edge of the back plate, such as a portion of the side edge portion of the back plate that is detached from the ear portion inward in the radial direction of the disk. It is good also as a structure which attaches a sensor board to site | parts other than.

  In the above-described embodiment, the case where the engagement hole 22D is an oval hole and the cross-sectional shape of the protrusion 9 of the back plate 7 is formed in an oval shape has been described as an example. However, the present invention is not limited to this, and other non-circular shapes other than the oval shape are adopted, for example, the engagement hole is formed by an elliptical hole, and the cross-sectional shape of the protrusion is correspondingly elliptical. May be.

  Further, in the above-described embodiment, the piston 5D is slidably provided on the inner leg portion 5A of the caliper 5 via the cylinder, and the outer leg portion 5C of the caliper 5 is in contact with the friction pad 6 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.

  According to the embodiment described above, the clamping part of the sensor plate has a U-shaped cross section having two opposing pieces that sandwich the side edge part of the back plate. It is set as the structure which provides a convex part and a recessed part on both sides of a joint hole. For this reason, while being able to ensure the attachment intensity | strength with respect to the back plate of a sensor board, it can suppress that a sensor board and a shim board interfere.

  Furthermore, according to the embodiment, the engagement hole is constituted by a non-circular hole having an oval shape or an elliptical shape. For this reason, the engagement between the engagement hole and the protrusion ensures the positioning accuracy of the sensor plate with respect to the back plate, prevents the sensor plate from rattling, and prevents the interference between the peripheral edge of the engagement hole and the edge of the protrusion. Can be planned.

6 Friction pad 7 Back plate 7A Surface 7B Ear (side edge of back plate)
7D Rear 8 Lining 9 Protrusion 11 Shim plate 11D Protruding plate (part of shim plate)
21 Sensor plate 22 Clamping part 22A One opposing piece 22B The other opposing piece 22E Convex part 22F Concave part 23 Crevice 24 Spring part 25 Vibrating part

Claims (3)

A friction pad comprising a back plate and a lining bonded to the surface of the back plate;
A shim plate for preventing brake noise that is attached to the back side of the back plate of the friction pad;
In a disc brake comprising a sensor plate attached to a back plate of the friction pad and alarming a wear limit of the lining by generating a sound in contact with the disc,
Protrusions for positioning the sensor plate on the back plate are provided on the back side of the side edge of the back plate,
The sensor plate is formed in a U-shaped cross-section that can be inserted into a side edge of the back plate, and has a sandwiching portion having two opposing pieces that sandwich the side edge,
A spring portion formed by turning in a U-shaped cross section on the back side of the back plate from the clamping portion;
And a vibration part linearly extending from the spring part toward the disk,
One of the opposing pieces of the sandwiching portion has an engaging hole to be engaged with the protrusion of the back plate and a position on one side in the radial direction of the disk across the engaging hole. And a convex portion protruding toward the other opposing piece of the clamping portion, and the other opposing piece disposed at the other radial position of the disc on the opposite side of the convex portion across the engagement hole. Provided with a recess formed to be recessed in a direction away from
The disc brake according to claim 1, wherein the protrusion has a protruding length larger than a thickness of the shim plate.   The disc brake according to claim 1, wherein a gap is formed between the recess and the back surface of the back plate so that a part of the shim plate enters.   The disc brake according to claim 1, wherein the engagement hole is configured by a non-circular hole having an elliptical shape or an oval shape.

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