JP5860266B2 - 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 has an attachment member attached to a non-rotating portion of the vehicle across the outer peripheral side of the disc in the axial direction, and a protrusion that is unevenly fitted to the attachment member. A pair of friction pads that are movable in the axial direction of the disk by the protrusions, a caliper that is slidably provided on the attachment member, and a pad spring that is attached to the attachment member and elastically supports each friction pad And so on.

  In this case, a rotational direction biasing member is provided on the protrusion of the friction pad, and the friction pad is attached to the disk by elastically abutting the distal end side of the rotational direction biasing member on the mounting member side via a pad spring. It is set as the structure urged | biased toward the rotation direction exit side (circumferential direction) (for example, refer patent document 1).

JP 2011-12713 A

  By the way, when the friction pad is assembled to the attachment member, the friction pad to which the rotational direction biasing member is attached is assembled to the attachment member to which the pad spring is attached. At this time, the rotational direction biasing member is assembled while being elastically deformed between the friction pad and the pad spring. However, depending on the shape of the pad spring, the work becomes troublesome and the workability at the time of assembling decreases. There is a problem.

  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 provide a disc brake capable of improving workability when the friction pad is assembled to the mounting member side. It is in.

  In order to solve the above-described problems, the disc brake according to the present invention includes an attachment member attached to a non-rotating portion of the vehicle across the outer peripheral side of the disc in the axial direction, and a protrusion portion that is unevenly fitted to the attachment member. A pair of friction pads that are movable in the axial direction of the disk by the protrusions, a caliper that is slidably provided on the attachment member, and each friction pad that is attached to the attachment member is elastic. And a rotation direction urging member that is provided on each friction pad and abuts against the pad spring and urges each friction pad in the rotation direction of the disk. Are a mounting portion fixed to the friction pad, a first extending portion coupled to the mounting portion at a base end side and extending in a direction away from the disk, and a distal end of the first extending portion. Shape on the side A folded portion that is folded back toward the disk, and a second extending portion that extends in a direction approaching the disk from the front end side of the folded portion and elastically contacts the mounting member in an elastically deformed state. The pad spring includes a radial urging portion that urges the friction pad in the radial direction of the disk by contacting one of the disk radial surfaces of the protrusion of the friction pad, and the radial urging portion. A support plate portion disposed opposite to the other disk radial surface of the protrusion of the friction pad by the biasing force of the radial biasing portion, and extending from the support plate portion in the disk radial direction to the friction plate An opposing plate portion facing the disk rotation direction surface of the protrusion portion of the pad, and a protruding portion provided to extend from the opposing plate portion in the same plane as the opposing plate portion in the disc separating direction. Part is the friction When the head is assembled to the pad spring, the distal end of the second extending portion of the rotational direction biasing member is in a state where one radial surface of the protrusion is in contact with the radial biasing portion. It is set as the structure currently formed in the magnitude | size which the full width of contact | abuts.

  According to the present invention, it is possible to improve workability when the friction pad is assembled to the mounting member side.

It is the top view which looked at the disc brake by embodiment of this invention from upper direction. It is the front view which looked at the disc brake from the arrow II-II direction in FIG. FIG. 2 is a partially broken plan view showing an attachment member, a friction pad, a pad spring, a rotation direction biasing member and the like with the caliper in FIG. 1 removed. FIG. 4 is a plan view of the inner side (upper side) friction pad and the rotation direction biasing member in FIG. 3 taken out from the same direction as FIG. 3. It is the front view which looked at the inner friction pad and the rotation direction biasing member from the arrow VV direction in FIG. It is a perspective view which shows a rotation direction biasing member alone. FIG. 4 is a side view of the left pad spring in FIG. 3 taken out and viewed from the left in FIG. 3. FIG. 8 is a side view of the pad spring, the friction pad, the rotation direction biasing member, and the like in the middle of assembling the friction pad to the mounting member, as viewed from the same direction as FIG. 7. It is the front view which looked at the pad spring in FIG. 7 from the right side. It is the top view which looked at the pad spring in FIG. 9 from the upper side. FIG. 4 is a partially broken plan view of the friction pad, the rotation direction biasing member, the pad spring, the attachment member, and the like in the middle of assembling the friction pad to the attachment member, as viewed from the same direction as FIG. 3. FIG. 4 is a partially broken plan view seen from the same direction as FIG. 3 showing a state in which the friction pad is incompletely assembled to the mounting member.

  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 in FIGS. 1 and 2 together with wheels (not shown) when the vehicle travels in the forward direction, for example, and indicates when the vehicle moves backward. It rotates in the direction opposite to the A direction.

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

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

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

  The pad guide 3 of each arm portion 2A is formed as a concave groove having a U-shaped cross section as shown in FIG. 2, and extends in a direction in which a friction pad 9 described later slides, that is, in the axial direction of the disk 1. The pad guide 3 is unevenly fitted to the protrusions 10B and 10C so as to sandwich protrusions 10B and 10C of a friction pad 9 described later from above and below (disk radial direction).

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

  That is, of the left and right pad guides 3 and 3 shown in FIG. In particular, the torque receiving surface 4 on the bottom side receives a braking torque received by a friction pad 9 (described later) from the disk 1 during braking operation via a protrusion 10C of the back plate 10 and a counter plate portion 25 of a pad spring 18 (described later). I accept. Further, the bottom side of the left pad guide 3 located on the rotation direction entrance side (hereinafter referred to as the turn-in side) of the disk 1 rotating in the direction of arrow A, that is, the torque receiving surface 4 is a rotation direction biasing member described later. 13, the friction pad 9 is disposed slightly away from the protrusion 10 </ b> B.

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

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

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

  The inner friction pad 9 and the outer friction pad 9 are disposed to face both surfaces of the disk 1. As shown in FIGS. 4 and 5, each friction pad 9 is fixed to a flat back plate 10 extending in a substantially fan shape in the circumferential direction (rotation direction) of the disk 1 and to the surface 10 </ b> A side of the back plate 10. And a lining 11 or the like as a friction material that comes into frictional contact with the surface of the disk 1.

  The back plate 10 of the friction pad 9 has protrusions 10 </ b> B and 10 </ b> C having convex shapes on the side surfaces located on both sides in the circumferential direction of the disk 1. The protrusions 10 </ b> B and 10 </ b> C are concavo-convexly fitted to the pad guide 3 of the mounting member 2, whereby the friction pad 9 is movable in the axial direction of the disk 1. The protrusions 10B and 10C constitute a torque transmission unit that transmits the braking torque received by the friction pad 9 from the disk 1 to the torque receiving surface 4 of the mounting member 2 when the vehicle is braked. Further, convex portions 10E for fixing a rotation direction urging member 13, which will be described later, are formed at portions corresponding to the protruding portions 10B and 10C on the back surface 10D of the back plate 10, respectively.

  The protrusions 10B and 10C of the friction pad 9 (back plate 10) are formed symmetrically left and right as shown in FIGS. 4 and 5, for example, and have the same shape. One protrusion 10B is arranged on the rotation direction entrance side (turn-in side) of the disk 1 that rotates in the direction of arrow A when the vehicle moves forward, and the other protrusion 10C is the rotation direction exit side of the disk 1 It is arranged on the (delivery side). Of the left and right protrusions 10B and 10C serving as the torque transmission part of the friction pad 9, a rotation direction biasing member 13 (described later) is provided via a protrusion 10E on the protrusion 10B located on the turn-in side of the disk 1. Is provided.

  A notch groove 12 is provided in the protrusion 10 </ b> B of the back plate 10. As shown in FIG. 5, the notch groove 12 is formed by partially cutting the projecting side (front end side) end surface of the protruding portion 10B into an L shape. A storage groove for storing is configured. The cutout groove 12 is disposed at a position that is 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 protrusion 10B.

  In addition, a notch groove 12 is formed in the protruding portion 10C located on the delivery side of the disk 1 as in the protruding portion 10B on the entry side. As a result, the friction pad 9 can share parts on the inner side and the outer side of the disk 1, reducing the number of parts of the disk brake and eliminating the manufacturing complexity. It becomes possible.

  The rotation direction biasing member 13 provided in each friction pad 9 abuts on the pad spring 18 and biases each friction pad 9 in the rotation direction of the disk 1. The rotational direction biasing member 13 is formed, for example, by bending (press forming) a stainless steel plate having elasticity as shown in FIG. 6, and includes an attachment portion 14, a first extension portion 15, The folded portion 16 and the second extending portion 17 are roughly configured.

  The mounting portion 14 of the rotational direction biasing member 13 is a portion fixed to the friction pad 9 and is formed in a U-shaped cross section that can be inserted into the protruding portion 10 </ b> B of the back plate 10. The mounting portion 14 includes two opposing pieces 14A and 14B that sandwich the thickness direction of the protruding portion 10B from both sides, and a connecting piece 14C that connects the opposing pieces 14A and 14B in the thickness direction of the protruding portion 10B. Have.

  And one opposing piece 14A arrange | positioned at the back surface 10D side of the backplate 10 among both opposing pieces 14A and 14B of the attaching part 14 is formed in a substantially rectangular shape, and the backplate 10 (protrusion) is formed in the center part. A fitting hole 14D that is fitted by, for example, interference fitting is provided through the convex portion 10E of the portion 10B). The fitting hole 14D has a non-circular shape (for example, a substantially oval shape) that is substantially the same as the cross-sectional shape of the convex portion 10E of the back plate 10, and thereby the rotation direction biasing with respect to the back plate 10 is performed. It is possible to ensure the positioning accuracy of the member 13 and prevent the rotation direction biasing member 13 from rattling.

  Further, an extending piece 14E is provided in a portion of the facing piece 14A that is located on the radially inner side of the disk 1 from the position where the connecting piece 14C is connected. The extending piece 14E extends from the one opposing piece 14A toward the distal end side of the protruding portion 10B, and the distal end side thereof is bent in a direction approaching the back surface 10D of the protruding portion 10B. For example, when the rotation direction urging member 13 tends to be inclined toward the inner side in the radial direction of the disk 1 or toward the turn-in side, the extended piece 14E contacts the rear surface 10D of the protrusion 10B and is attached to the rotation direction. This prevents the urging member 13 from rattling against the back plate 10.

  One end side of the connecting piece 14C constituting the mounting portion 14 is connected to one opposing piece 14A, and the disc 1 is connected to the disk 1 through the notch groove 12 of the protruding portion 10B from the back surface 10D side of the back plate 10 toward the front surface 10A side. It extends in the direction of approach. And the other end side of the connection piece 14C extended to the surface 10A side of the back plate 10 is connected to the other facing piece 14B.

  And the other opposing piece 14B which comprises the attaching part 14 is connected to the other end side of the connection piece 14C, and is extended along the surface 10A of the backplate 10 from this other end side. The mounting portion 14 is formed in a substantially U shape by the facing pieces 14A and 14B and the connecting piece 14C, and holds the protrusion 10B of the back plate 10 so that the rotational direction biasing member 13 is attached to the friction pad 9. Can be installed.

  The first extending portion 15 of the rotation direction urging member 13 is coupled (integrally formed) to the mounting portion 14 at the base end side and extends in a direction away from the disk 1. Specifically, the first extending portion 15 is connected to a portion of the one opposing piece 14A opposite to the connecting piece 14C across the fitting hole 14D, and is separated from the back surface 10D side of the back plate 10. Extending in the direction.

  The folded portion 16 of the rotational direction biasing member 13 is joined (integrated) to the distal end side of the first extending portion 15 and folded in a U shape toward the disk 1 on the back surface 10D side of the back plate 10. It is.

  The second extending portion 17 of the rotation direction urging member 13 extends in a direction approaching the disk 1 from the front end side of the folded portion 16. When the friction pad 9 is assembled to the attachment member 2, the second extension portion 17 is elastically contacted with the torque receiving surface 4 of the attachment member 2 via the opposing plate portion 25 of the pad spring 18 in an elastically deformed state. As a result, it is possible to prevent the friction pad 9 from rattling in the circumferential direction of the disk 1 due to vibration or the like when the vehicle travels. Moreover, brake squeal (slight squeal) during slow braking can be suppressed. In addition, the imaginary line (two-dot chain line) of the rotation direction biasing member 13 shown in FIG. 6 shows a free state (a state where the elastic deformation is not performed).

  A pair of pad springs 18 and 18 are attached to each arm 2 </ b> A of the attachment member 2. The pad springs 18 elastically support the inner and outer friction pads 9 and smooth the sliding displacement of the friction pads 9 in the disk axial direction. Each pad spring 18 is formed, for example, by bending (press molding) spring steel such as a stainless steel plate having spring properties as shown in FIGS.

  The pad spring 18 includes a connecting plate portion 19, a flat plate portion 20, an engaging plate portion 21, and a guide portion 22 which will be described later. In the following description regarding the respective parts of the pad spring 18, the terms “upper”, “upper surface” or “upward” mean the radially outer side, the radially outer surface or the radially outer side of the disk 1. As used herein, the terms “lower”, “lower” or “downward” are used to mean the radially inner side, the radially inner surface or the radially inward direction of the disk 1.

  The connecting plate portion 19 of the pad spring 18 connects the pair of flat plate portions 20 of the pad spring 18 together with the guide portions 22, that is, the guide portions 22 are integrated on the inner side and the outer side of the disk 1. In order to connect them, the disk 1 is formed so as to extend in the axial direction across the outer peripheral side of the disk 1. A pair of flat plate portions 20, 20 extend inward in the radial direction of the disk 1 and are integrally formed on both ends in the length direction of the connecting plate portion 19. The engaging plate portion 21 is located between the pair of flat plate portions 20 and 20 and is formed integrally with the connecting plate portion 19. The engagement plate portion 21 is attached to the attachment member 2 so as to engage with the disk path portion of the arm portion 2A from the radially inner side. As a result, the pad spring 18 is positioned in the axial direction of the disk 1 with respect to the arm portion 2 </ b> A of the mounting member 2.

  The pair of guide portions 22, 22 are provided on both end sides of the connecting plate portion 19 via the flat plate portions 20. Each guide portion 22 is formed by being bent into a substantially U shape from the lower end (front end side) of the flat plate portion 20. One guide portion 22 of the pair of guide portions 22 is fitted and attached in the inner side pad guide 3, and the other guide portion 22 is fitted and attached to the outer side pad guide 3. Yes. And the guide parts 22 and 22 are comprised including the radial direction urging | biasing part 23, the support plate part 24, the opposing board part 25, and the protrusion part 26. As shown in FIG.

  The pair of radial urging portions 23 constituting the lower surfaces of the guide portions 22 and 22 are brought into contact with the disk radial direction surfaces 10B1 and 10C1 on the lower surface side of the protrusions 10B and 10C of the friction pad 9, so that the friction pad 9 is 1 is biased outward in the radial direction. Thereby, it can suppress that the friction pad 9 rattles with respect to the attachment member 2. FIG.

  Here, the radial urging portion 23 extends downward from the lower surface plate 23A constituting the lower surface of the guide portion 22 to the axially outer side of the disk 1 from the lower surface plate 23A (that is, radially outward of the disk 1). ) And a curl portion 23B formed by being bent into a substantially C shape or a substantially U shape, and extending in a direction approaching the disc 1 from the tip of the curl portion 23B (ie, the diameter of the disc 1). And an extended portion 23C that is inclined outward (inward direction) and abuts the projections 10B and 10C of the friction pad 9.

  When the protruding portions 10B and 10C of the friction pad 9 are inserted into the guide portion 22, the radially urging portion 23 has an extended portion 23C between the protruding portions 10B and 10C of the friction pad 9 and the lower surface plate 23A. Elastically deformed so as to be sandwiched between them. In this state, the extending portion 23 </ b> C of the radial biasing portion 23 elastically biases the protrusions 10 </ b> B and 10 </ b> C of the friction pad 9 (back plate 10) toward the radially outer side of the disk 1, 9 prevents the mounting member 2 from rattling in the disk radial direction.

  The support plate portion 24 of the guide portion 22 is disposed so as to face the radial urging portion 23, and becomes the upper surface side of the protrusions 10 </ b> B and 10 </ b> C of the friction pad 9 by the urging force of the radial urging portion 23. The surfaces 10B2 and 10C2 are in contact with each other. The support plate portion 24 extends outward in the rotational direction of the disk 1 so as to be bent 90 degrees from the lower end side of the flat plate portion 20.

  The support plate portion 24 is integrally formed with an insertion guide portion 24 </ b> A that protrudes toward the outer side in the axial direction of the disk 1 and whose tip (projecting end) side is inclined obliquely outward in the radial direction of the disk 1. The insertion guide portion 24A inserts the protrusions 10B and 10C of the friction pad 9 between the support plate portion 24 and the radial direction biasing portion 23 of the guide portion 22 and guides the protrusions 10B and 10C. 22 is provided in order to smoothly guide the inside.

  The opposing plate portion 25 is opposed to the disk rotation direction surfaces 10B3 and 10C3 of the protrusions 10B and 10C of the friction pad 9. The opposing plate portion 25 extends inward in the disk radial direction from the support plate portion 24. The opposing plate portion 25 abuts against the back side wall surface of the pad guide 3 (that is, the torque receiving surface 4) when the pad spring 18 is attached to the attachment member 2.

  The protruding portion 26 is provided so as to extend from the counter plate portion 25 in the same plane as the counter plate portion 25 in the separation direction of the disk 1, and the tip side thereof is inclined obliquely outward in the rotation direction of the disk 1. . When the friction pad 9 is assembled to the pad spring 18, the protruding portion 26 is in a state in which the disk radial surface 10 B 1 (or edge) which is the lower surface side of the protruding portion 10 B is in contact with the radial urging portion 23. The full width W of the distal end 17A of the second extending portion 17 of the rotation direction urging member 13 is formed so as to abut.

  Specifically, as shown in FIGS. 7 to 10, the length dimension B of the protrusion 26 in the rotational direction of the disk 1 and the length dimension C of the protrusion 26 in the radial direction of the disk 1 are determined by the friction pad 9. The second extending portion of the rotational direction biasing member 13 with the disk radial direction surface 10B1 of the protrusion 10B of the friction pad 9 placed on the radial direction biasing portion 23 when assembled to the pad spring 18. The full width W of the tip 17 </ b> A of the 17 is set so as to come into contact with the protruding portion 26. Thus, when the friction pad 9 is assembled to the mounting member 2, the tip 17A of the second extending portion 17 of the rotational direction biasing member 13 can be easily brought into contact with the protruding portion 26, and From the contacted state, the friction pad 9 can be easily slid toward the disk 1 while the friction pad 9 is pushed outward in the rotational direction of the disk 1.

  That is, as shown in FIGS. 8 and 11, when the protrusion 10 </ b> B of the friction pad 9 is placed on the radial biasing portion 23, the second extending portion 17 of the rotational biasing member 13 protrudes. The portion 26 can be reliably brought into contact. In addition, while the friction pad 9 is pushed toward the outside of the disk 1 in the rotation direction (the direction indicated by the arrow D in FIG. 11) from the contacted state, the rotation direction biasing member 13 is elastically deformed, The friction pad 9 can be slid in the direction approaching the disk 1 (the direction of arrow E in FIG. 11) on the extending portion 23C of the radial urging portion 23. Thereby, workability | operativity of the operation | work which attaches the friction pad 9 to the attachment member 2 can be improved.

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

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

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

  Further, at the time of such brake operation or release (during non-braking), the protrusion 10B located on the disk 1 turn-in side among the protrusions 10B and 10C of the friction pad 9 is rotated in the rotational direction biasing member 13. 2 is urged in the direction of arrow F in FIG. 2, and the friction pad 9 is constantly urged with a weak force toward the delivery side of the disk 1 (direction of arrow A in FIG. 1). Then, the protrusion 10C located on the delivery side of the disk 1 is elastically pressed against the torque receiving surface 4 of the pad guide 3 through the guide portion 22 of the pad spring 18 by the biasing force at this time.

  For this reason, the friction pad 9 rattles in the circumferential direction of the disk 1 due to vibrations or the like when the vehicle travels, and is provided with a rotational direction provided between the protrusion 10B on the disk insertion side and the torque receiving surface 4. It can be regulated by the force member 13. Then, the braking torque (rotation torque in the direction of arrow A) received by the friction pad 9 from the disk 1 during braking operation when the vehicle moves forward is received by the arm portion 2A (torque receiving surface 4 of the pad guide 3) on the delivery side. I can accept it.

  As a result, the protrusion 10 </ b> C located on the disk delivery side of the friction pad 9 continues to contact the torque receiving surface 4 of the pad guide 3 via the guide portion 22. Moreover, since the projecting portion 10C on the output side is in contact with the guide portion 22 due to the action of the rotational direction biasing member 13 before the brake operation and there is no clearance, the friction pad 9 is moved by the braking torque. No abnormal noise (rattle sound) is generated.

  The protrusions 10B and 10C of the friction pad 9 are slidably inserted into the pad guides 3 and 3 positioned on the turn-in side and the turn-out side of the disk 1 via the guide part 22 of the pad spring 18. The radial urging portions 23 are urged outward in the radial direction of the disk 1. As a result, the protrusions 10B and 10C of the friction pad 9 can be elastically pressed against the support plate portion 24 (the radially outer surface of the disk 1) of the guide portion 22.

  For this reason, the frictional pad 9 can be prevented from rattling in the radial direction of the disk 1 due to vibration or the like during traveling by the radial biasing portion 23 of the pad spring 18. When the brake is operated, the inner and outer friction pads 9 are moved to the guide portion 22 while the protrusions 10B and 10C of the friction pad 9 are kept in sliding contact with the support plate portion 24 side of the guide portion 22. Along the direction of the axis of the disk 1 can be smoothly guided.

  By the way, at the time of the assembly work of the disc brake, the protrusion 10B is assembled to the pad guide 3 of the attachment member 2 via the pad spring 18 with the rotational direction biasing member 13 attached to the protrusion 10B of the friction pad 9. . At this time, the rotational direction biasing member 13 of the friction pad 9 is inserted into the pad guide 3 in a state where it is elastically deformed between the protrusion 10B of the friction pad 9 and the guide portion 22 of the pad spring 18. In this case, if the protrusion 26 of the pad spring 18 with which the tip 17A of the second extension 17 of the rotation direction biasing member 13 abuts is small, the tip of the second extension 17 of the rotation direction biasing member 13 There is a problem that it is difficult to bring 17A into contact with the protruding portion 26, and workability during assembly is reduced.

  Therefore, in the present embodiment, the length dimension B and the length dimension C of the protruding portion 26 of the pad spring 18 are set as follows. That is, the length dimension B and the length dimension C are set such that the disk radial surface 10B1 of the protrusion 10B of the friction pad 9 is placed on the radial biasing portion 23 when the friction pad 9 is assembled to the pad spring 18. In this state, the entire width W of the distal end 17A of the second extending portion 17 of the rotation direction urging member 13 is set so as to contact the protruding portion 26.

  Thereby, when the friction pad 9 is assembled to the mounting member 2, the tip end 17 </ b> A of the second extending portion 17 of the rotation direction biasing member 13 can be easily brought into contact with the protruding portion 26. At the same time, it is easy to slide the friction pad 9 toward the disk 1 while pushing the friction pad 9 outward in the rotational direction of the disk 1 from the contacted state. Can do. In other words, by setting the size of the protruding portion 26 as described above, the tip 17A of the second extending portion 17 can be easily brought into contact with the protruding portion 26. At the same time, it is possible to easily guide (guide) the distal end 17A of the second extending portion 17 from the protruding portion 26 toward the opposing plate portion 25 while elastically deforming the rotation direction urging member 13. As a result, the workability of the work of assembling the friction pad 9 to the mounting member 2 can be improved.

  Moreover, as shown in FIG. 12, when the rotational direction biasing member 13 is assembled in an incorrect positional relationship, that is, the first extension portion 15 and the second extension portion of the rotational direction biasing member 13. When the projecting portion 26 is assembled between the second extending portion 17 and the rotational direction biasing member 13 before the friction pad 9 is disposed at the proper position, Can be brought into contact with the tip of the protrusion 26. Thereby, it can be determined by whether the friction pad 9 is arrange | positioned in the regular position that the rotation direction biasing member 13 was assembled | attached by the incorrect positional relationship. As a result, for example, an operator who assembles the disc brake can easily understand whether or not the disc brake is misassembled, and the misassembly can be reduced. 12 indicates the surface position of the lining 11 when the friction pad 9 is inserted into a normal position within the guide portion 22 of the pad spring 18. The phantom line shown in FIG.

  Therefore, according to the present embodiment, it is possible to improve the workability when the friction pad 9 is assembled in each pad guide 4 of the mounting member 2, resulting from the incorrect assembly of the rotational direction biasing member 13. The occurrence of incomplete assembly of the disc brake can be prevented.

  In the above embodiment, the case where the torque receiving surface 4 serving as the torque receiving portion is configured by the back side wall surface of the pad guide 3 formed of the U-shaped concave groove has been described as an example. However, the present invention is not limited to this. For example, the present invention can also be applied to a disc brake of a type in which a torque receiving surface as a torque receiver is provided at a position separated from the pad guide (a position different from the pad guide).

  Moreover, in the said embodiment, the attachment part 14 of the rotation direction biasing member 13 demonstrated and demonstrated the case where it formed in the cross-sectional U-shape which can be inserted in the projection part 10B of the friction pad 9. As shown in FIG. However, the present invention is not limited to this. For example, the mounting portion is formed in a flat plate shape, and a concave portion having substantially the same shape as the convex portion of the back plate is provided in the mounting portion, and the concave portion is caulked to the convex portion of the back plate. Thus, the rotational direction biasing member may be attached to the friction pad.

  In the above embodiment, the pad spring 18 has a configuration in which the radial urging portion 23 is disposed on the inner side and the support plate portion 24 is disposed on the outer side with respect to the radial direction of the disk 1. The case where 10B and 10C are elastically biased toward the radially outer side of the disk 1 has been described as an example. However, the present invention is not limited to this, and the positional relationship between the radial urging portion and the support plate portion may be reversed with respect to the radial direction of the disk. That is, with respect to the radial direction of the disk, the radial biasing portion is disposed on the outer side and the support plate portion is disposed on the inner side, and the protrusion of the friction pad is elastically biased toward the radial inner side of the disk 1. It is good also as what to do.

DESCRIPTION OF SYMBOLS 1 Disc 2 Mounting member 5 Caliper 9 Friction pad 10 Back plate 10B, 10C Protrusion part 10B1, 10B2, 10C1, 10C2 Disc radial direction surface 10B3, 10C3 Disc rotation direction surface 13 Rotation direction biasing member 14 Attachment portion 15 First extension Protruding portion 16 Folding portion 17 Second extending portion 17A Tip 18 Pad spring 22 Guide portion 23 Radial urging portion 24 Support plate portion 25 Opposing plate portion 26 Protruding portion

Claims (1)

An attachment member attached to the non-rotating part of the vehicle straddling the outer peripheral side of the disk in the axial direction;
A pair of friction pads that have protrusions that are concavely and convexly fitted to the mounting member, and that are movable in the axial direction of the disk by the protrusions;
A caliper provided slidably on the mounting member;
A pad spring that is attached to the attachment member and elastically supports the friction pads;
A rotation direction biasing member that is provided on each friction pad and abuts against the pad spring and biases each friction pad in the rotation direction of the disk;
The rotational direction biasing member is
A mounting portion fixed to the friction pad;
A first extension portion coupled to the attachment portion at a proximal end side and extending in a direction away from the disk;
A folded portion formed on the leading end side of the first extending portion and folded in a direction approaching the disk;
A second extension portion extending in a direction approaching the disk from the front end side of the folded portion and elastically contacting the attachment member side in an elastically deformed state;
The pad spring is
A radial biasing portion that abuts one of the disk radial surfaces of the protrusion of the friction pad and biases the friction pad in the radial direction of the disk;
A support plate portion disposed opposite to the radial urging portion and in contact with the other disk radial surface of the protrusion of the friction pad by the urging force of the radial urging portion;
A counter plate portion extending from the support plate portion in the disk radial direction and facing a disk rotation direction surface of the protrusion of the friction pad;
A projecting portion provided to extend from the facing plate portion in the same plane as the facing plate portion in the disc separating direction,
The projecting portion is configured such that when the friction pad is assembled to the pad spring, the second urging member of the rotational direction urging member is in a state in which one disk radial surface of the projecting portion is in contact with the radial urging portion. A disc brake characterized in that the full width of the tip of the extended portion is formed so as to abut.

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