JP2008241046A - Disc brake - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To stabilize energizing force to suppress dragging or the like of a friction pad by engaging a pad return spring elastically with a mounting member or the like. <P>SOLUTION: A caliper 5 straddling both sides of a disc D is supported by the mounting member 1, and each arm part 3 of the mounting member 1 supports the friction pad 7 slidably through a pad guide part 3A. A back plate 8 of the friction pad 7 is provided with the pad return spring 11, and its tip engaging part 17 is elastically engaged with the arm part 3 or a pad guide spring 10. Thereby, energizing force in a return direction applied to the friction pad 7 from the pad return spring 11 can be stabilized to reduce dragging or the like of the friction pad 7. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a disc brake suitably used for applying a braking force to a vehicle such as an automobile.

  In general, a disc brake used in a vehicle such as an automobile has a configuration using a pad return spring in order to prevent the friction pad from being dragged against the disc when the brake operation is released. It has been.

  A disc brake according to this type of prior art includes a mounting member having a pair of arm portions extending in the axial direction at intervals in the circumferential direction of the disc, and a pad guide portion formed on each arm portion, and the mounting member A caliper that is slidably supported by each arm portion, a pair of friction pads that are slidably supported in the axial direction by each arm portion of the mounting member, and pressed against both sides of the disk by the caliper, and a spring It is composed of a pad return spring that is formed of a metallic material having a property and urges the friction pad in a direction away from the disk (see, for example, Patent Document 1).

Japanese Utility Model Publication No. 56-2432

  Here, the pad return spring includes an attachment portion attached to the friction pad, a first extension portion that is provided integrally with the attachment portion and extends away from the disk on the back surface side of the friction pad, and the first extension portion. A second extending portion extending in a direction approaching the disc by turning the leading end side of the extending portion toward the disc into a substantially U shape, and a mounting member provided on the leading end side of the second extending portion. It is comprised from the contact part which contact | abuts elastically to an outer surface.

  When the disc brake is operated, when brake fluid from the outside is supplied to the caliper, the caliper presses each friction pad against both sides of the disc against the pad return spring. As a result, the friction pad slides and displaces in the axial direction toward the disc, and slides against the disc to apply a braking force. At this time, the pad return spring is in an elastically deformed state so that the second extending portion contacting the attachment member side expands with respect to the first extending portion attached to the friction pad side.

  On the other hand, when the brake operation is released, if the caliper or the like is displaced in a direction away from the disk, each friction pad is also displaced in a direction away from the disk by the urging force of the pad return spring. In this case, the pad return spring is configured to pull the friction pad away from the disk while being restored to close from the elastically deformed state in which the first and second extending portions are expanded.

  By the way, in the above-described conventional technology, the first extension portion side of the pad return spring formed in a substantially U shape is attached to the friction pad, and the second extension portion side is brought into contact with the outer surface side of the attachment member. Thus, the friction pad is urged away from the disk by using a pad return spring.

  However, the contact portion provided on the distal end side of the second extending portion is merely in contact with the outer surface side of the mounting member, so that the pad return spring is elastic according to the sliding displacement of the friction pad. When deforming, the contact portion may move so as to slide along the outer surface side of the mounting member, so that the contact position of the pad return spring changes with respect to the mounting member each time the brake is operated or released. There is a case.

  As a result, when releasing the brake operation, the elastic deformation amount of the pad return spring may vary, or the frictional resistance force between the pad return spring and the mounting member may fluctuate. There is a possibility that the urging force of the pad return spring which is going to be separated from the disk becomes unstable.

  For this reason, in the prior art, although the pad return spring is attached, the friction pad may not be sufficiently separated from the disc when the brake operation is released due to its unstable operation. There is a problem that it is difficult to improve durability and quality as a disc brake due to premature wear or abnormal noise of the friction pad due to sliding or the like.

  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 stabilize the urging force in the return direction applied to the friction pad from the pad return spring, and reliably prevent dragging of the friction pad and the like. Another object is to provide a disc brake capable of improving durability and quality.

  In order to solve the above-described problems, the present invention provides a mounting member having a pair of arm portions extending in the axial direction at intervals in the circumferential direction of the disk, and a pad guide portion formed on each arm portion, A caliper that is slidably supported by each arm of the mounting member, and a pair of friction pads that are slidably supported in the axial direction by each arm of the mounting member and pressed against both sides of the disk by the caliper; In order to guide each friction pad along each pad guide portion of the mounting member, a pad guide spring attached to each arm portion and a friction pad formed of a metal material having a spring property are attached in a direction away from the disk. This is applied to a disc brake composed of a pad return spring.

  A feature of the configuration adopted by the invention of claim 1 is that the pad return spring is provided with an attachment portion attached to the friction pad and an integrated portion provided on the attachment portion and located on the back side of the friction pad. A first extending portion extending in a direction away from the disc, and a second extending portion extending in a direction approaching the disc by turning the tip side of the first extending portion toward the disc, And a tip engaging portion that is provided on the tip side of the second extending portion and elastically engages with the mounting member or the pad guide spring.

  With this configuration, the friction pad can be urged away from the disk by using the pad return spring, and when releasing the brake operation, the friction pad can be pulled away from the disk by this urging force. Further, even when the pad return spring is greatly elastically deformed, the tip engagement portion can be elastically engaged with the mounting member or the pad guide spring, and these engagement positions are the elastic deformation of the pad return spring. It is possible to prevent deviation at the time of restoration or restoration.

  According to a second aspect of the present invention, the tip engaging portion is bent from the tip side of the abutting portion into the abutting portion that abuts against the mounting member or the pad guide spring, and is inserted into the pad guide portion of the attaching member. It is comprised from the engaging claw part inserted so that engagement was possible.

  Thus, for example, when the tip engagement portion of the pad return spring is about to be displaced with respect to the attachment member, the engagement claw portion can be engaged with the pad guide portion, etc. of the attachment member. It is possible to prevent the position shift of this section.

  Furthermore, in the invention of claim 3, a bent portion that is located on the back side of the friction pad and is elastically deformable is provided between the attachment portion and the first extending portion.

  As a result, the pad return spring can be provided with a plurality of bent portions that can be elastically deformed including the bent portions provided between the first and second extending portions, for example, one bent portion. Even when the portion is not sufficiently restored due to deterioration or the like, the urging force of the pad return spring can be compensated by the other bent portion.

  According to a fourth aspect of the present invention, the second extending portion is configured to extend obliquely with respect to the axial direction of the disk.

  As a result, the friction pad can be urged in the direction away from the pad guide (axial direction) using the pad return spring, for example, while urging the friction pad away from the disk (axial direction). It can be smoothly slid in the guide portion, and at the same time, it is possible to prevent the friction pad from hitting the pad guide portion during braking or the like (sounding a clonk).

  As described above, according to the invention of claim 1, since the pad return spring is constituted by the mounting portion, the first and second extending portions, and the tip engagement portion, the pad return spring is provided when releasing the brake operation. Can be used to reliably pull the friction pad away from the disk. Even when the pad return spring is greatly elastically deformed, the tip engaging portion can be elastically engaged with the mounting member or the pad guide spring, and these engagement positions are determined when the pad return spring is elastically deformed. Alternatively, it is possible to reliably prevent the shift at the time of restoration, and it is possible to stably maintain the engagement state of both. As a result, the urging force in the return direction applied to the friction pad from the pad return spring can be stabilized, the pad return spring can be used to reliably prevent the friction pad from being dragged, and the friction pad is prematurely worn and noise caused by the drag. The durability and quality as a disc brake can be improved by suppressing the above.

  According to the second aspect of the present invention, since the tip engaging portion is constituted by the abutting portion and the engaging claw portion, even when the pad return spring is largely elastically deformed, the engaging claw portion is attached to the mounting member or the pad guide. While being engaged with the spring, the abutting portion can be elastically abutted against these members, and this abutting position is reliably prevented from shifting during elastic deformation or restoration of the pad return spring. be able to.

  Further, according to the invention of claim 3, since the bent portion that can be elastically deformed is provided between the attachment portion and the first extending portion, some of the bent portions are temporarily set. Even when the bent portion is not sufficiently restored due to deterioration or the like, the urging force of the pad return spring can be compensated for by the other bent portion, and its life can be extended.

  According to a fourth aspect of the present invention, since the second extending portion extends obliquely with respect to the axial direction of the disk, the pad return spring pulls the friction pad away from the disk. Not only the direction but also the direction away from the pad guide part of the arm part can be urged. Thereby, when the brake is operated and released, the sliding resistance of the friction pad in the pad guide portion can be reduced, and the friction pad can be smoothly displaced by sliding.

  Hereinafter, a disc brake according to an embodiment of the present invention will be described in detail with reference to FIGS. Here, FIGS. 1 to 8 show a first embodiment of the present invention.

  Reference numeral 1 denotes an attachment member that is attached to a non-rotating portion of the vehicle in the vicinity of the wheel of the automobile. The attachment member 1 is disposed on the inner side of the disk D that rotates in the direction of arrow A in FIG. 2 and 3, the mounting member 1 is fixed to the non-rotating portion of the vehicle, and is integrally formed with the fixing portion 2. The mounting member 1 is separated from the disk D in the circumferential direction. It is comprised from a pair of arm parts 3 and 3 extended in the axial direction so that the outer peripheral side may be straddled, and the connection part 4 etc. which connected each arm part 3. Each arm portion 3 is provided with a groove-shaped pad guide portion 3A extending in the axial direction of the disk D.

  A caliper 5 is slidably supported on each arm 3 of the mounting member 1 via a pair of sliding pins 6 and 6 (only one is shown). The caliper 5 is a disk D as shown in FIG. An inner leg portion 5A disposed on the inner side, a bridge portion 5B extending from the inner leg portion 5A across the outer periphery of the disk D to the outer side, and a radially inner side from the distal end side of the bridge portion 5B. The outer claw portion 5C and the like are disposed on the outer side of the disk D, and are formed in a substantially U-shaped cross section as a whole. A piston (not shown) is slidably inserted into the inner leg 5A.

  7 and 7 are inner side and outer side friction pads positioned on both sides of the disk D and disposed between the calipers 5. The friction pads 7 are substantially fan-shaped and extend in the circumferential direction of the disk D. The back plate 8 is formed in a flat plate shape, and the lining 9 is fixed to the front side of the back plate 8 and faces the disk D.

  Here, as shown in FIGS. 3 and 4, the both sides of the back metal 8 are formed in a substantially rectangular shape that is slidably supported by the pad guide portions 3 </ b> A of the respective arm portions 3 via pad guide springs 10 described later. Ear portions 8A and 8A are integrally formed. Further, caulking projections 8B and 8B for a pad return spring 11 and a wear alarm member 19 described later are provided on the back side of the back metal 8 located in the vicinity of each ear 8A.

  When the driver operates the brake, the friction pad 7 slides in the pad guide portion 3A of the arm portion 3 through the pad guide spring 10 in the respective ear portions 8A of the back metal 8, for example, as shown in FIG. A configuration is adopted in which a braking force is applied in sliding contact with the disk D by sliding displacement in the axial direction along the pad guide portion 3A from the release position to the braking position shown in FIG.

  Reference numerals 10 and 10 denote left and right pad guide springs for guiding the friction pad 7 in the axial direction along the pad guide portions 3A of the left and right arms 3, respectively. The pad guide springs 10 are as shown in FIG. For example, it is made of a metal plate having a spring property and is attached to each arm portion 3. The pad guide spring 10 includes an outer end portion 10A located on the radially outer side of the disk D, an inner end portion 10B located on the radially inner side, and a pad guide of the arm portion 3 between these end portions 10A and 10B. It is configured by integrally forming a bent portion 10C bent in a substantially rectangular shape along the portion 3A.

  Reference numerals 11 and 11 denote pad return springs provided on the back metal 8 of each friction pad 7, and each pad return spring 11 presses a metal plate or the like having a spring property, for example, as shown in FIGS. And is fixed to the ear portion 8A on the inlet side of the disk D in the rotational direction of each of the ear portions 8A of the back metal 8, and a mounting portion 12, a first extension portion 14, and a second extension portion described later. It is comprised by the part 16, the front-end | tip engaging part 17, etc.

  Reference numeral 12 denotes an attachment portion attached to the ear portion 8A of the back metal 8. The attachment portion 12 is bent in a substantially U shape along the outer surface of the ear portion 8A, and the ear portion 8A is elastically formed in the thickness direction. It is pinched. Further, the mounting portion 12 is provided with a mounting hole 12A located on the back side of the friction pad 7, and the mounting hole 12A is fixed by caulking to the caulking projection 8B of the back metal 8. Further, a bent portion 13 is provided between the attachment portion 12 and the extended portion 14, for example, having two corners and bent into a substantially U shape.

  Reference numeral 14 denotes a first extending portion integrally formed with the mounting portion 12 via the bent portion 13, and the extending portion 14 extends obliquely in a direction away from the disk D. In addition, a substantially V-shaped bent portion 15 is provided between the extended portion 14 and the extended portion 16 on the distal end side.

  Then, when the friction pad 7 is in the braking release position as shown in FIG. 4, the pad return spring 11 holds the elastically deformed state so that the bent portions 13 and 15 expand so that the friction pad 7 Biasing away from the disk D. When the friction pad 7 is slid to the braking position by the brake operation, the pad return spring 11 is greatly elastically deformed as shown in FIG. Thus, when the brake operation is released, the friction pad 7 is pulled away from the disk D by the restoring force of the pad return spring 11 and returns to the brake release position.

  Reference numeral 16 denotes a second extending portion formed by bending the front end side of the extending portion 14 toward the disk D. The extending portion 16 extends obliquely toward the disk D as shown in FIG. When the friction pad 7 is in the braking release position, the friction pad 7 is tilted by a predetermined angle α of about 10 to 45 ° with respect to the axial direction of the disk D, for example. Thereby, the pad return spring 11 also biases the friction pad 7 in a direction away from the pad guide portion 3A of the arm portion 3 (tangential direction of the disk D).

  Reference numeral 17 denotes a substantially L-shaped distal end engaging portion formed by bending the distal end side of the extending portion 16 toward the extending portion 14, and the distal end engaging portion 17 is a pad guide portion 3 </ b> A of the arm portion 3. A contact portion 17A that elastically contacts the bent portion 10C of the pad guide spring 10 in the vicinity or from the side opposite to the disk D, and a front end side of the contact portion 17A is bent toward the disk D. The engaging claw portion 17B is located in the pad guide portion 3A and is inserted between the ear portion 8A of the back metal 8 and the bent portion 10C of the pad guide spring 10 so as to be engageable.

  When the pad return spring 11 is greatly elastically deformed, the engaging claw portion 17B is hooked on the bent portion 10C of the pad guide spring 10, thereby braking the pad return spring 11 to be greatly elastically deformed, and the pad return spring 11 When the braking is released, the abutting portion 17A is prevented from being displaced with respect to the arm portion 3 or the pad guide spring 10.

  Further, when the friction pad 7 is in the temporarily fixed position shown in FIG. 8 in the assembly work of the disc brake described later, the pad return spring 11 maintains a free length state in which no urging force is applied to the friction pad 7. The dimension L1 formed between the ear portion 8A of the back metal 8 and the engaging claw portion 17B of the pad return spring 11 with respect to the substantially tangential direction is the bent portion 10C of the ear portion 8A of the back metal 8 and the pad guide spring 10. (L1 <L2) so as to be smaller than the dimension L2 formed between the two.

  18 is a wear warning member provided on the back metal 8 of the friction pad 7. The wear warning member 18 is formed of a long U-shaped metal piece or the like as shown in FIG. It is arranged on the side ear 8A. Further, the wear warning member 18 is fixed to the caulking protrusion 8B on the base end side, and the front end side faces the surface of the disk D with a certain distance. The wear warning member 18 generates an abnormal noise by sliding on the disk D when the wear of the lining 9 exceeds the design tolerance or the like, and issues a warning to the driver.

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

  First, when assembling the disc brake, the pad return spring 11 and the like are attached to the inner side and outer side friction pads 7, and then these friction pads 7 are attached to the attachment member 1 at the temporary fixing positions in FIG. And the caliper 5 is assembled | attached to the attachment member 1, and, thereby, each friction pad 7 is hold | maintained in the brake release position in FIG.

  Next, when the brake is operated, the brake fluid is supplied from the outside, so that the piston slides and displaces within the inner leg portion 5A of the caliper 5, and this piston presses the inner friction pad 7 against the disk D. At this time, the caliper 5 is displaced toward the inner side with respect to the mounting member 1 by a reaction force from the disk, and the outer claw portion 7C presses the outer friction pad 7 against the disk D. As a result, each friction pad 7 slides and displaces within the pad guide portion 3A of the arm portion 3 against the pad return spring 11, and slides against both surfaces of the disk D to give a braking force.

  In this case, when the displacement amount of the friction pad 7 is small, an external force in a direction close to the length direction is applied to the extending portion 16 of the pad return spring 11. Elastically deforms to open. When the displacement amount of the friction pad 7 increases to some extent, the external force applied in the thickness direction of the extending portion 16 also increases, so that the bent portion 15 is elastically deformed so as to expand.

  Next, when the brake operation is released, if the piston of the caliper 5, the outer claw portion 5C, etc. are displaced away from the disk D, the friction pads 7 are also displaced away from the disk D by the urging force of the pad return spring 11. To do. In this case, the pad return spring 11 pulls the friction pad 7 away from the disk D while restoring the folded portions 13 and 15 to close from the elastically deformed state.

  Thus, in the present embodiment, since the pad return spring 11 is constituted by the mounting portion 12, the extending portions 14, 16, the tip engaging portion 17, etc., the friction pad 7 is removed from the disk D using the pad return spring 11. The urging force can be stably urged away, and when the brake operation is released, the friction pad 7 can be reliably separated from the disk D by this urging force.

  Even when the pad return spring 11 is greatly elastically deformed, the abutting portion 17A is elastically attached to the mounting member 1 and the like while the engaging claw portion 17B of the tip engaging portion 17 is hooked to the pad guide spring 10. The abutting positions can be applied to each other, and it is possible to reliably prevent the abutting positions from deviating when the pad return spring 11 is elastically deformed or restored, and to stably hold the abutting state of both.

  As a result, the urging force in the return direction applied from the pad return spring 11 to the friction pad 7 can be stabilized, the pad return spring 11 can be used to reliably prevent the friction pad 7 from being dragged, and the friction pad 7 can be worn early. Further, the durability and quality of the disc brake can be improved by suppressing noise caused by dragging.

  In addition, since the pad return spring 11 is provided with, for example, two bent portions 13 and 15, if one of the bent portions 13 and 15 is not sufficiently restored due to deterioration or the like. However, the urging force of the pad return spring 11 can be compensated for by the other bent portion, and its life can be extended.

  Further, since the extending portion 16 is extended toward the disk D while being inclined by the angle α, the pad return spring 11 is provided not only in the direction of separating the friction pad 7 from the disk D but also in the pad guide of the arm portion 3. It can also be biased in the direction away from the portion 3A. Thus, when the brake is operated and released, the sliding resistance of the friction pad 7 in the pad guide portion 3A can be reduced, and the friction pad 7 can be smoothly slid and displaced.

  When the pad return spring 11 is in a free length state, the dimension L1 between the back metal 8 and the pad return spring 11 is formed smaller than the dimension L2 between the back metal 8 and the pad guide spring 10. When the friction pad 7 is attached to the temporary fixing position, the engaging claw portion 17B can be easily inserted between the back metal 8 and the pad guide spring 10 without elastically deforming the pad return spring 11 while being in a free length state. Thus, the assembly work of the disc brake can be performed efficiently.

  Next, FIG. 9 shows a second embodiment according to the present invention. In this embodiment, the same components as those in the first embodiment are denoted by the same reference numerals, and description thereof is omitted. And

  Reference numeral 21 denotes a pad return spring of the disc brake according to the present embodiment. The pad return spring 21 includes a mounting portion 22 attached to the caulking projection 8B of the back metal 8 and a bending portion, as in the first embodiment. It is comprised by the part 23, the 1st extension part 24, the bending part 25, the 2nd extension part 26, the front-end | tip engaging part 27 grade | etc.,.

  However, the attachment portion 22 is caulked and fixed together with the wear warning member 19 to the caulking protrusion 8B of the back metal 8. The tip engaging portion 27 is formed by bending in a substantially L shape in a direction away from the friction pad 7, and protrudes while elastically engaging with the protruding portion 28 protruding from the arm portion 3. It has been applied.

  Thus, in the present embodiment configured as described above, it is possible to obtain substantially the same operational effects as those of the first embodiment. In particular, in the present embodiment, the pad return spring 21 is attached together with the wear warning member 19, so that the pad return spring 21 can also be disposed on the rotational direction exit side of the disk D and applied to the friction pad 7. The urging force in the direction can be further stabilized.

  Further, by elastically engaging the distal end engaging portion 27 with the protruding portion 28 of the arm portion 3, a gap formed between the pad guide portion 3A of the arm portion 3 and the back metal 8 of the friction pad 7 is small. Even in this case, the engaging portion of the pad return spring 21 can be secured.

  Next, FIG. 10 shows a third embodiment according to the present invention. In this embodiment, the same components as those in the first embodiment are denoted by the same reference numerals, and the description thereof is omitted. And

  31 is a pad return spring of the disc brake according to the present embodiment. The pad return spring 31 is substantially the same as in the first embodiment, and includes an attachment portion 32, a bent portion 33, a first extending portion 34, The front end engaging portion 37 includes a bent portion 35, a second extending portion 36, a front end engaging portion 37, and the like, and the front end engaging portion 37 includes a contact portion 37A and an engaging claw portion 37B.

  However, the front end engaging portion 37 has an abutting portion 37A located near the pad guide portion 3A and abutted against the outer surface of the arm portion 3A, and an engaging claw portion 37B located within the pad guide portion 3A. The arm portion 3 and the bent portion 10C of the pad guide spring 10 are inserted so as to be engageable with each other.

  Thus, in the present embodiment configured as described above, it is possible to obtain substantially the same operational effects as those of the first embodiment. And especially in this Embodiment, the engagement state can be more stabilized by inserting the engagement nail | claw part 37B between the arm part 3 and the pad guide spring 10. FIG.

  Next, FIG. 11 shows a fourth embodiment according to the present invention. In this embodiment, the same components as those in the first embodiment are denoted by the same reference numerals, and the description thereof is omitted. And

  Reference numeral 41 denotes a pad return spring of the disc brake according to the present embodiment. The pad return spring 41 is substantially the same as in the first embodiment, and includes a mounting portion 42, a bent portion 43, a first extending portion 44, It is comprised by the bending part 45, the 2nd extension part 46, the front-end | tip engaging part 47 grade | etc.,.

  However, the distal end engaging portion 47 is formed to be bent in a substantially L shape in a direction away from the friction pad 7, and elastically engages with a protruding portion 48 </ b> A protruding from the pad guide spring 48. It has been hit.

  Thus, in the present embodiment configured as described above, it is possible to obtain substantially the same operational effects as those of the first embodiment. In particular, in the present embodiment, the engagement portion of the pad return spring 41 can be secured only by providing the pad guide spring 48 with the protrusion 48A.

  Next, FIGS. 12 and 13 show a fifth embodiment according to the present invention. In this embodiment, the same components as those in the first embodiment are denoted by the same reference numerals, and the description thereof will be given. Shall be omitted.

  51 is a pad return spring of the disc brake according to the present embodiment. The pad return spring 51 is substantially the same as in the first embodiment, and includes an attachment portion 52, a bent portion 53, a first extending portion 54, A bent portion 55, a second extending portion 56, a tip engaging portion 57, and the like are included.

  However, the bent portion 53 is disposed closer to the end portion of the friction pad 7 than the mounting portion 52, and is bent outward in a substantially U shape. Further, the tip engaging portion 57 is formed by branching into a trifurcated shape as shown in FIG. 13, and the center abutting portion 57A is abutted against the outer surface of the arm portion 3, and the left and right engaging claw portions. 57B is engaged with the bent portion 10C of the pad guide spring 10 while being inserted into the pad guide portion 3A of the arm portion 3.

  Thus, in the present embodiment configured as described above, it is possible to obtain substantially the same operational effects as those of the first embodiment. In this embodiment, in particular, the front end engaging portion 57 is formed in a trifurcated shape, the abutting portion 57A is abutted against the arm portion 3, and the left and right engaging claw portions 57B are disposed within the pad guide portion 3A. Since it is set as the structure engaged with the pad guide spring 10, the engagement state of the front-end | tip engaging part 57 with respect to the attachment member 1 side can be stabilized more.

  In each of the embodiments, the pad return springs 11, 21, 31, 41, 51 are caulked and fixed to the caulking protrusion 8B of the back metal 8. However, the present invention is not limited to this, and the ears of the back metal 8 are used. A spring attachment portion including attachment holes, attachment grooves, and the like may be provided in 8A, and pad return springs 11, 21, 31, 41, 51 may be attached to the spring attachment portion.

  In each of the above embodiments, the attachment portions 12, 22, 32, 42, 52 of the pad return springs 11, 21, 31, 41, 51 and the first extending portions 14, 24, 34, 44, 54 are provided. For example, a substantially U-shaped bent portion 13, 23, 33, 43 or a substantially U-shaped bent portion 53 having two corners is provided between the two, but the present invention is not limited thereto. Instead, a configuration in which three or more bent portions are provided between the attachment portion and the first extending portion may be employed.

  In each of the above embodiments, the attachment portions 12, 22, 32, 42, 52 of the pad return springs 11, 21, 31, 41, 51 are caulked and fixed to the back side of the back metal 8. 3 may be configured to be caulked and fixed to the side surface side of the ear portion 8A of the back metal 8 facing to the surface 3, or may be configured to be caulked and fixed to the surface side of the ear portion 8A.

  In the first, third, and fourth embodiments, the attachment portions 12, 32, and 42 of the pad return springs 11, 31, and 41 are formed in a substantially U shape, and the attachment portions 12, 32, and 42 Although the ear 8A of the back metal 8 is elastically clamped, the ear 8A is not necessarily clamped. For example, it may be configured to be attached to the back side of the back metal 8 only by caulking.

  Further, a gap may be formed between the protrusion 48 </ b> A of the pad guide spring 48 and the arm 3 of the attachment member 1 in the fourth embodiment.

  Further, in each of the above-described embodiments, the disk brake for automobiles has been described as an example, but the present invention is not limited to this, and can be applied to other vehicles such as motorcycles.

1 is a front view showing a disc brake according to a first embodiment of the present invention. It is a top view of the disc brake which cuts and shows a mounting member and a part of caliper. It is a principal part enlarged view in FIG. 1 which shows the vicinity of a pad guide part. It is a principal part expanded sectional view in FIG. 2 which shows a pad return spring etc. FIG. It is a perspective view which expands and shows a pad return spring. It is a principal part expanded sectional view of the disc brake which looked at the wear warning member etc. from the arrow VI-VI direction in FIG. It is a principal part expanded sectional view which shows the state by which the friction pad was pressed by the disk at the time of operation of a brake. It is a principal part expanded sectional view which shows the state which assembled | attached the friction pad, the pad return spring, etc. to the attachment member at the time of the assembly of a brake. It is a principal part expanded sectional view which shows the pad return spring etc. of the disc brake by the 2nd Embodiment of this invention. It is a principal part expanded sectional view which shows the pad return spring etc. of the disc brake by the 3rd Embodiment of this invention. It is a principal part expanded sectional view which shows the pad return spring etc. of the disc brake by the 4th Embodiment of this invention. It is a principal part expanded sectional view which shows the pad return spring etc. of the disc brake by the 5th Embodiment of this invention. It is a fragmentary perspective view which expands and shows the front-end | tip engaging part of the pad return spring in FIG.

Explanation of symbols

D disk 1 mounting member 3 arm portion 3A pad guide portion 5 caliper 7 friction pad 10, 48 pad guide spring 11, 21, 31, 41, 51 pad return spring 12, 22, 32, 42, 52 mounting portion 13, 23, 33, 43, 53 Bending part 14, 24, 34, 44, 54 First extending part 16, 26, 36, 46, 56 Second extending part 17, 27, 37, 47, 57 Tip engagement Part 17A, 37A, 57A Abutting part 17B, 37B, 57B Engagement claw part

Claims (4)

A mounting member having a pair of arm portions extending in the axial direction at intervals in the circumferential direction of the disk, and a pad guide portion formed on each arm portion, and slidably supported on each arm portion of the mounting member A pair of friction pads that are slidably supported in the axial direction by the arms of the mounting member and pressed against both sides of the disk by the calipers, and the friction pads are connected to the pads of the mounting member. A pad guide spring attached to each of the arm parts for guiding along the guide part, and a pad return spring formed of a metal material having a spring property and biasing the friction pad away from the disk. In the disc brake,
The pad return spring includes an attachment portion attached to the friction pad, and a first extension portion that is provided integrally with the attachment portion and is located on the back surface side of the friction pad and extends away from the disk. A second extending portion extending in a direction approaching the disc by bending the leading end side of the first extending portion toward the disc; and the attachment provided on the leading end side of the second extending portion. A disc brake comprising a tip engaging portion that elastically engages with a member or a pad guide spring.   The tip engagement portion includes a bump portion that abuts against the mounting member or the pad guide spring, and an engagement that is bent from the tip side of the bump portion and is inserted into the pad guide portion of the attachment member so as to be engageable. The disc brake according to claim 1, comprising a claw portion.   3. The disc brake according to claim 1, wherein a bending portion that is located on a back surface side of the friction pad and is elastically deformable is provided between the attachment portion and the first extension portion.   4. The disc brake according to claim 1, wherein the second extending portion is configured to extend while being inclined with respect to an axial direction of the disc.

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