JP2018017297A - Disc brake - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce occurrence of brake noise.SOLUTION: A disc brake includes: a mounting member 2 mounted on a non-rotation part of a vehicle, and formed striding over an outer peripheral side in an axial direction of a disc 1; a caliper 5 provided at the mounting member 2 in a slidable manner; and a pair of pads 9 provided on both sides by sandwiching the disc 1, and pressed to the disc 1 by the caliper 5. At the mounting member 2, first, second pad guides 3, 4 are provided on both sides in the rotation direction of the disc 1. At the first, second pad guides 3, 4, first, second pad springs 14, 26 are mounted respectively for supporting the pad 9 via first, second lug parts 11, 12 of the pad 9. At the first, second pad springs 14, 26, energization parts 22, 34 are provided respectively for energizing each pad 9 outward in the rotation direction of the disc 1.SELECTED DRAWING: Figure 2

Description

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

  Generally, a disc brake provided in a vehicle such as an automobile is attached to a non-rotating portion of the vehicle, and has a pair of pad guides formed so as to straddle the outer peripheral side of the disc in the axial direction and spaced apart in the rotational direction of the disc. A caliper slidably provided on the mounting member, a pair of pads that are inserted into each pad guide of the mounting member, and pressed against the disc by the caliper, and the mounting member And a pad spring that supports the pad via the ear (see, for example, Patent Document 1).

JP 2012-215181 A

  By the way, the above-described pad spring according to the prior art urges the pad toward the inner side (center side of the pad) in the rotation direction of the disk and arranges the pad at the center of the mounting member. For this reason, at the time of a brake operation, the pad is dragged by the rotating disk and moves to the rotating side in the rotating direction of the disk. In this case, the urging force of the pad spring located on the disk delivery side becomes stronger and the urging force of the pad spring located on the disk delivery side weakens, so the pad posture is unstable. Therefore, there is a risk that brake noise (abnormal noise) is likely to occur.

  The present invention has been made in view of the above-mentioned problems of the prior art, and an object of the present invention is to stabilize the posture of the pad during brake operation and reduce the occurrence of brake squeal.

  In order to solve the above-described problems, the present invention provides first and second pad guides that are attached to a non-rotating portion of a vehicle, are formed so as to straddle the outer peripheral side of the disc in the axial direction, and are separated in the rotational direction of the disc. A mounting member having a caliper provided slidably on the mounting member, and provided on both sides of the disc, and the first and second pad guides of the mounting member at both ends of the disc in the rotational direction. And a pair of pads that are pressed against the disk by the caliper, and the first and second pad guides of the mounting member, respectively. In a disc brake provided with first and second pad springs that support the pads via first and second ears, the first and second pad springs It is characterized in that the urging portion for urging the pads on the outer side of the rotation direction of the disk are provided.

  According to the present invention, it is possible to reduce the occurrence of brake squeal (abnormal noise) during brake operation.

It is the top view which looked at the disc brake by embodiment of this invention from upper direction. It is the front view which looked at the disc brake from the arrow II-II direction in FIG. It is a front view which expands and shows the pad guide, pad spring, etc. which are located in the turn-in side of the disk rotated in the arrow A direction in FIG. It is a front view which expands and shows the pad guide, pad spring, etc. which are located in the delivery side of the disk rotated in the arrow A direction in FIG. It is sectional drawing which looked at the attachment member, pad, pad spring, etc. in FIG. 2 from the arrow VV direction. It is a perspective view which shows the state which attached the pad spring, the pad, etc. to the pad guide of an attachment member. It is a perspective view which shows a pad spring alone. It is a perspective view which shows the pad spring by a modification independently.

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

  The disc 1 shown in FIGS. 1 and 2 rotates, for example, in the direction of arrow A in FIGS. 1 and 2 together with wheels (not shown) when the vehicle travels in the forward direction, and when the vehicle moves backward, It rotates in the direction indicated by B. The left and right directions in FIG. 1 are the rotation direction (circumferential direction) of the disk 1, and the upper and lower directions are the axial direction of the disk 1. Further, the upper and lower directions in FIG.

  The attachment member 2 is attached to the non-rotating part of the vehicle. 1, 2, and 6, the mounting member 2 includes a pair of arm portions 2 </ b> A that extend in the axial direction of the disk 1 so as to be spaced apart from each other in the rotational direction of the disk 1 and straddle the outer peripheral side of the disk 1. 2A and a thick-walled support portion 2B which is provided so as to be integrated so that the base end sides of the respective arm portions 2A are integrated, and is fixed to a non-rotating portion of the vehicle at a position on the inner side of the disc 1. It is configured to include. One arm portion 2A is located on the right side in FIGS. 1 and 2, that is, on the turn-in side of the disc 1 rotating in the direction of arrow A (hereinafter referred to as the turn-in side of the disc 1), and the other arm portion 2A. Is located on the left side in FIGS. 1 and 2, that is, on the delivery side of the disk 1 rotating in the direction of arrow A (hereinafter referred to as the delivery side of the disk 1).

  The attachment member 2 is 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.

  Each arm portion 2A of the mounting member 2 has a disk path portion 2D (the other arm portion 2A in FIG. 6) that extends in an arc along the outer periphery (rotation locus) of the disk 1 at a position that is an intermediate portion in the axial direction of the disk 1. Only shown). Each arm 2A is provided with pin holes 2E and 2E. In these pin holes 2E, slide pins 6 described later are slidably fitted.

  The first pad guide 3 is formed so as to extend in the direction in which the pad 9 described later is slidably displaced, that is, the axial direction of the disk 1, which is located on the side of the attachment of the disk 1 in the mounting member 2. On the other hand, the second pad guide 4 is formed so as to extend in the direction in which the pad 9 (described later) slides and displaces, that is, the axial direction of the disk 1. These pad guides 3 and 4 have a U-shaped cross section as shown in FIG. 2 and are separated in the rotational direction of the disk 1. Here, the first pad guide 3 and the second pad guide 4 are formed symmetrically (left and right symmetrical) in the rotational direction of the disk 1 and have the same shape as each other. The pad guide 3 will be described in detail.

  The first pad guide 3 includes a bottom portion 3A serving as a torque receiving portion provided on the outer side in the rotation direction of the disc 1, and an inner wall portion 3B provided on the inner side in the radial direction of the disc 1 with respect to the bottom portion 3A. The outer wall 3C is provided on the outer side in the radial direction of the disk 1 with respect to the bottom 3A. The inner wall portion 3B and the outer wall portion 3C are spaced apart from each other in the radial direction of the disk 1 and are arranged in parallel to each other. The first pad guide 3 is formed as a concave groove (concave groove) extending in the axial direction of the disk 1 by the bottom 3A, the inner wall 3B, and the outer wall 3C. The first pad guide 3 sandwiches the first ear portion 11 of the back plate 10 of the pad 9 between the inner wall portion 3B and the outer wall portion 3C from above and below (the radial direction of the disk 1). The pad 9 is guided in the axial direction of the disk 1 between the wall portions 3B and 3C.

  On the other hand, the second pad guide 4 is also formed as a concave groove portion (concave groove) extending in the axial direction of the disk 1 by the bottom portion 4A, the inner wall portion 4B, and the outer wall portion 4C, similarly to the first pad guide 3. Yes. The second pad guide 4 sandwiches the second ear portion 12 of the back plate 10 of the pad 9 between the inner wall portion 4B and the outer wall portion 4C from above and below (the radial direction of the disk 1). The pad 9 is guided in the axial direction of the disk 1 between the wall portions 4B and 4C.

  That is, the bottom portion 3A of the first pad guide 3 has the pad 9 in the direction indicated by the arrow C in FIG. 2 when the vehicle is moving backward (when the disk 1 is rotating in the direction indicated by the arrow B). And the braking torque received by the pad 9 from the disk 1 is received via the first ear portion 11 of the back plate 10 of the pad 9 and the guide plate portion 16 of the first pad spring 14. On the other hand, the bottom portion 4A of the second pad guide 4 is such that the pad 9 is in the direction indicated by the arrow D in FIG. 2 when the vehicle is moving forward (when the disc 1 is rotating in the direction indicated by the arrow A). The pad 9 receives the braking torque that the pad 9 receives from the disk 1 through the second ear portion 12 of the back plate 10 of the pad 9 and the guide plate portion 28 of the second pad spring 26.

  The caliper 5 is slidably provided on the mounting member 2. As shown in FIG. 1, the caliper 5 has inner legs 5A provided on the inner side which is one side of the disk 1 and inner arms 2A of the mounting member 2 so as to straddle the outer peripheral side of the disk 1. A bridge portion 5B extending from the portion 5A to the outer side, which is the other side of the disk 1, and an outer side, which is the tip side of the bridge portion 5B, extending inward in the radial direction of the disk 1, and the tip side is The outer leg portion 5C as a claw portion having a shape is also formed.

  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 the sliding pin 6 extends toward the pin hole 2E of each arm portion 2A of the mounting member 2, and is slidably inserted into the pin hole 2E. As shown in FIG. 1, protective boots 8 are respectively attached between the arm portion 2A and the sliding pin 6, and rainwater or the like enters between the sliding pin 6 and the pin hole 2E of the arm portion 2A. It is preventing.

  Next, the inner side and outer side pads 9 for applying a braking force to the rotating disk 1 will be described.

  The inner side pad 9 and the outer side pad 9 are arranged to face both surfaces of the disk 1. Each pad 9 is pressed against the disk 1 by the caliper 5. Each pad 9 includes a flat plate 10 that extends substantially in the shape of a fan in the rotation direction (circumferential direction) of the disk 1 and a friction material that is fixedly attached to the surface of the back plate 10 and frictionally contacts the disk 1. And the lining 13 as a structure.

  The back plate 10 of the pad 9 is provided with a first ear portion 11 and a second ear portion 12 which are located at both ends in the rotation direction of the disk 1 and have convex shapes. The first ear portion 11 is slidably inserted (arranged) in the first pad guide 3 of the mounting member 2, and the second ear portion 12 slides on the second pad guide 4 of the mounting member 2. Inserted (positioned) as possible. As a result, the pad 9 is movable in the axial direction of the disk 1.

  The first ear portion 11 constitutes a torque transmitting portion that transmits the braking torque received by the pad 9 from the disk 1 during the braking operation when the vehicle is moving backward, in contact with the bottom portion 3A of the first pad guide 3. Is. On the other hand, the second ear portion 12 is a torque transmission portion that transmits the braking torque received by the pad 9 from the disc 1 during the braking operation when the vehicle is moving forward in contact with the bottom portion 4A of the second pad guide 4. It constitutes. Since the first ear portion 11 and the second ear portion 12 are formed symmetrically to the left and right and have the same shape, the first ear portion 11 will be described in detail below.

  The first ear portion 11 is located on the outer side in the rotational direction of the disc 1 and faces the bottom portion 3A of the first pad guide 3 in the rotational direction outer surface portion 11A, and is located on the inner side in the radial direction of the disc 1. An inner side surface portion 11B that faces the inner wall portion 3B of one pad guide 3 and an outer surface portion 11C that is located outside the disk 1 in the radial direction and faces the outer wall portion 3C of the first pad guide 3. ing.

  The first ear portion 11 is formed with a concave portion 11D that is recessed in a trapezoidal shape from the inner side surface portion 11B toward the outer side in the radial direction of the disk 1. The recess 11D penetrates the disk 1 in the axial direction. The recesses 11D are positioned on the outer side in the radial direction of the disk 1 and are located on both sides of the bottom surface 11D1 formed as a flat surface and the rotation direction (left and right direction) of the disk 1 on the bottom surface 11D1, respectively. It is comprised by the rotation direction inner wall surface 11D2 and the rotation direction outer wall surface 11D3 which were formed as an inclined surface. In the recess 11D, a pressing portion 25 of the first pad spring 14 described later is disposed in an elastically deformed state.

  On the other hand, similarly to the first ear part 11, the second ear part 12 is composed of an outer surface part 12A in the rotational direction, an inner side part 12B, and an outer surface part 12C. The second ear portion 12 is formed with a concave portion 12D that is recessed in a trapezoidal shape from the inner side surface portion 12B toward the outer side in the radial direction of the disk 1. The recess 12D penetrates the disk 1 in the axial direction. The recesses 12D are positioned on the outer side in the radial direction of the disk 1 and are located on both sides of the bottom surface 12D1 formed as a flat surface and the rotational direction (left and right directions) of the disk 1 on the bottom surface 12D1, respectively. It is comprised by the rotation direction inner wall surface 12D2 formed as an inclined surface, and the rotation direction outer wall surface 12D3. A pressing portion 37 of a second pad spring 26 to be described later is disposed in an elastically deformed state in the recess 12D.

  Next, the first pad spring 14 and the second pad spring 26 will be described.

  The first pad spring 14 is attached to the first pad guide 3 of the attachment member 2. The first pad springs 14 are separately attached to the first pad guides 3 positioned on the outer side and the inner side with the disc path portion interposed therebetween. On the other hand, the second pad spring 26 is attached to the second pad guide 4 of the attachment member 2. The second pad springs 26 are separately attached to the second pad guides 4 positioned on the outer side and the inner side with the disc path portion 2D interposed therebetween. Here, the first pad spring 14 and the second pad spring 26 are formed symmetrically (left and right symmetrical) in the rotational direction of the disk 1 and have the same shape as each other. The pad spring 14 will be described in detail.

  The first pad spring 14 supports the pad 9 via the first ear portion 11 while being attached to the first pad guide 3. That is, the first pad spring 14 elastically supports the pad 9 and smoothes the sliding displacement of the pad 9 in the disk axial direction. The first pad spring 14 is formed, for example, by bending (press forming) a spring steel such as a stainless steel plate having spring properties as shown in FIG.

  As shown in FIG. 7, the first pad spring 14 includes a flat plate portion 15, a guide plate portion 16, and an urging portion 22. In addition, regarding the respective parts of the first pad spring 14, in the following description, the terms “upper”, “upper surface”, or “upward” are used to refer to the outer side in the radial direction of the disk 1, the outer surface in the radial direction, or the radial direction. The term “lower”, “lower surface” or “downward” means the radially inner side, the radially inner surface of the disk 1 or the radially inward direction. It will be used as.

  The flat plate portion 15 is located between the arm portion 2 </ b> A and the first pad guide 3 and extends in the axial direction of the disk 1. The length dimension in the axial direction of the disk 1 of the flat plate portion 15 is formed slightly longer than the length dimension in the axial direction of the disk 1 of the first pad guide 3 on each of the outer side and the inner side.

  The guide plate portion 16 is formed by being bent into a substantially U shape from the lower end of the flat plate portion 15. The guide plate portion 16 is fitted between the first pad guide 3 and the first ear portion 11 of the pad 9, and guides the first ear portion 11 of the pad 9 in the axial direction of the disk 1. The guide plate portion 16 includes a support plate 17, a counter plate 18, a guide plate 19, and a seat surface plate 20.

  The support plate 17 of the guide plate portion 16 extends toward the outside 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 15. As shown in FIG. 3, the support plate 17 is in contact with the outer wall 3 </ b> C of the first pad guide 3. Then, the outer surface portion 11 </ b> C of the first ear portion 11 of the pad 9 contacts the support plate 17 by the upward biasing force of the biasing portion 22.

  The opposing plate 18 extending from the support plate 17 toward the inner side in the radial direction of the disk 1 has the first pad guide when the first pad spring 14 is attached to the first pad guide 3 of the attachment member 2. 3 is in contact with the bottom 3A. Then, the counter plate 18 is opposed to the rotation direction outer side surface portion 11 </ b> A of the first ear portion 11 of the pad 9. The pad 9 is dragged in the direction indicated by the arrow C during the brake operation when the vehicle is moving backward (when the disc 1 is rotating in the direction indicated by the arrow B). The outer side surface portion 11 </ b> A contacts the counter plate 18.

  The guide plate 19 extends in the same plane as the counter plate 18 from the counter plate 18 toward the outside in the axial direction of the disk 1. The guide plate 19 is provided to smoothly guide the first ear 11 to the inside of the guide plate 16 when the first ear 11 of the pad 9 is inserted into the guide plate 16. .

  The seat surface plate 20 extends toward the inner side in the rotation direction of the disk 1 so as to be bent 90 degrees from the lower end of the counter plate 18. The seat plate 20 faces the support plate 17 in the radial direction of the disk 1. The seat plate 20 and the support plate 17 are connected by a counter plate 18.

  Thus, the guide plate portion 16 is formed in a substantially U-shape or a substantially U-shape that is recessed in a concave shape by the support plate 17, the counter plate 18, and the seating surface plate 20. The guide plate 16 is fitted and attached in the first pad guide 3 to guide the pad 9 in the axial direction of the disk 1.

  The claw portion 21 is provided as a protrusion that extends from the counter plate 18 toward the seat plate 20 and protrudes downward from the seat plate 20. The front end side of the claw portion 21 is hooked on the inner wall portion 3B of the first pad guide 3 in an elastically deformed state. Thereby, the claw portion 21 elastically presses the support plate 17 of the guide plate portion 16 toward the outer wall portion 3C of the first pad guide 3 by the reaction force from the inner side wall portion 3B, and the guide plate portion 16 is pressed. The first pad guide 3 is held in a retaining state.

  The urging portion 22 is provided so as to extend from the seating surface plate 20 of the guide plate portion 16. The urging portion 22 urges the first ear portion 11 of the pad 9 toward the upper side (support plate 17 side), and urges the first ear portion 11 toward the outer side in the rotational direction of the disk 1. It is a force. The urging portion 22 includes an extending portion 23, a turning portion 24, and a pressing portion 25.

  A pair of extending portions 23 are provided apart from each other in the axial direction of the disk 1. Each of the pair of extending portions 23 is formed as an elongated spring piece, and extends from the seat surface plate 20 of the guide plate portion 16 toward the inner side in the radial direction of the disk 1. Specifically, the extension portion 23 is bent with respect to the first pad guide 3 by bending it into a “<” shape from the seating surface plate 20 of the guide plate portion 16 toward the inside in the radial direction of the disk 1. And tilted downward.

  The folded portion 24 is formed by bending the leading end side of each extending portion 23 upward (as a radial outer side of the disk 1) as a whole into a substantially C shape or a substantially U shape. . In other words, each folded portion 24 has a shape that is once bent downward from the tip of the extending portion 23 and then bent and folded upward. As shown in FIG. 3, the folded portion 24 is formed in a convex shape on the lower side when viewed from the axial direction of the disk 1.

  The pressing portion 25 extends from each folded portion 24 into the concave portion 11D of the first ear portion 11, and the distal end side is located in the concave portion 11D. The pressing portion 25 extends obliquely upward in a direction approaching the guide plate portion 16 from each folded portion 24, and is inclined to the outer side in the radial direction of the disk 1 and is connected to the inclined portion 25A and is connected to the first portion 25A. The contact portion 25B is in contact with the recess 11D of the ear portion 11.

  In this case, the contact portion 25B connects the inclined portions 25A that are separated in the axial direction of the disk 1. Further, the abutting portion 25B is bent and bent downward (in the radial direction of the disk 1) into a substantially C shape or a substantially U shape, and extends in the axial direction of the disk 1. That is, the contact portion 25B is formed so as to extend in the axial direction of the disk 1 in the recess 11D of the first ear portion 11. The contact portion 25B is always in contact with the bottom surface 11D1 of the recess 11D of the first ear portion 11 and the rotation-direction outer wall surface 11D3 in a state having elasticity. As a result, the urging portion 22 causes the first ear portion 11 of the pad 9 to move outward in the radial direction of the disc 1 (on the outer wall portion 3C side of the first pad guide 3) and outside in the rotational direction of the disc 1 (first 1 is always biased toward the bottom 3 </ b> A side of the pad guide 3.

  On the other hand, the second pad spring 26 attached to the second pad guide 4 of the attachment member 2 also has a flat plate portion 27, a guide plate portion 28, a support plate 29, a counter plate 30, similarly to the first pad spring 14. The guide plate 31, the seat surface plate 32, the claw portion 33, the urging portion 34, the extending portion 35, the folding portion 36, and the pressing portion 37 (inclined portion 37 </ b> A, abutting portion 37 </ b> B).

  In this case, the abutting portion 37 </ b> B of the pressing portion 37 is formed so as to extend in the axial direction of the disk 1 within the recess 12 </ b> D of the second ear portion 12. The contact portion 37B is always in contact with the bottom surface 12D1 of the concave portion 12D of the second ear portion 12 and the outer wall surface 12D3 in the rotational direction with an elastic force. As a result, the urging portion 34 of the second pad spring 26 causes the second ear portion 12 of the pad 9 to move radially outward of the disc 1 (on the outer wall portion 4C side of the second pad guide 4) and the disc 1. Is constantly biased toward the outside in the rotational direction (the bottom 4A side of the second pad guide 4).

  Accordingly, the first ear portion 11 of the pad 9 is pulled toward the bottom 3A side of the first pad guide 3 by the first pad spring 14, and the second ear portion 12 is pulled by the second pad spring 26. 2 is pulled to the bottom 4A side of the pad guide 4. As a result, the pad 9 is positioned substantially at the center in the rotational direction of the disc 1 of the mounting member 2 when the brake operation is released (in a non-braking state). That is, when releasing the brake operation, a slight gap is formed between the rotation direction outer side surface portion 11A of the first ear portion 11 of the pad 9 and the opposing plate 18 of the first pad spring 14, and the pad 9 A slight gap is formed between the rotational direction outer side surface portion 12 </ b> A of the second ear portion 12 and the opposing plate 30 of the second pad spring 26.

  Here, the action of the first and second pad springs 14 and 26 when the brake operation is performed when the vehicle moves forward (when the disk 1 rotates in the direction of arrow A) will be described.

  When a brake operation is performed when the vehicle moves forward, the pad 9 is dragged by the rotation of the disk 1 and moves in the direction indicated by the arrow D. In this case, the urging force (tensile force) in the arrow C direction of the urging portion 22 of the first pad spring 14 is increased. On the other hand, the urging force (tensile force) in the arrow D direction of the urging portion 34 of the second pad spring 26 is reduced. That is, the tensile force on the first ear portion 11 side not receiving the braking torque is larger than the tensile force on the second ear portion 12 side receiving the braking torque from the disk 1. Thereby, since the pad 9 is stabilized, brake noise can be reduced.

  Further, as shown in FIG. 5, the disk 1 rotating in the direction of arrow A and the lining 13 of the pad 9 are brought into frictional contact with the second ear portion 12 of the pad 9, thereby moving in the direction of arrow E. A moment is generated. However, the urging portion 22 of the first pad spring 14 urges in the arrow C direction so as to cancel the moment in the arrow E direction. Thereby, the pad 9 can stabilize and a brake squeal can be reduced.

  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 cause the piston 5D to slide and displace toward the disc 1, whereby the inner pad 9 is moved to the disc. 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 and displaced toward the inner side with respect to each arm portion 2A of the mounting member 2, and the outer leg portion 5C is a pad on the outer side. 9 is pressed against the other side of the disk 1.

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

  In this case, the first ear portion 11 of the pad 9 is slidably inserted into the first pad guide 3 via the guide plate portion 16 of the first pad spring 14, and the first pad spring 14 The pressing portion 25 of the urging portion 22 is urged toward the outer side in the radial direction of the disc 1 (outside wall portion 3C side). Similarly, the second ear portion 12 of the pad 9 is slidably inserted into the second pad guide 4 via the guide plate portion 28 of the second pad spring 26, and the second pad spring 26 is inserted. The urging portion 34 of the urging portion 34 is urged toward the outer side in the radial direction of the disk 1 (outside wall portion 4C side).

  As a result, it is possible to reduce the pad 9 from rattling in the radial direction of the disk 1 due to vibration during traveling. When the brake is operated, the first and second ear portions 11 and 12 of the pad 9 are held in sliding contact with the support plates 17 and 29 of the guide plate portions 16 and 28, respectively, while the inner side and the outer The side pad 9 can be smoothly guided along the guide plate portions 16 and 28 in the axial direction of the disk 1.

  By the way, in the prior art disclosed in Patent Document 1, pad springs arranged on the disk entry side and the turnout side respectively direct the pad ears toward the inside of the disk rotation direction (center side of the pad). Energized. As a result, the pad is arranged at the center of the mounting member when the brake operation is released (during non-braking). When the brake is operated, the pad is dragged by the rotating disk and moved to the rotation side in the rotation direction of the disk.

  In this case, the urging force toward the pad center side against the ear part of the pad spring located on the disk delivery side becomes stronger, and the urging force toward the pad center side against the ear part of the pad spring located on the disk entry side becomes stronger. Since it becomes weak, there is a possibility that the posture of the pad becomes unstable and brake noise is likely to occur.

  Therefore, in the present embodiment, the first and second pad springs 14 and 26 arranged on the turn-in side and the turn-out side of the disc 1 are respectively connected to the first and second ear portions 11 and 12 of the pad 9. Each is urged toward the outside in the rotational direction of the disk 1.

  Specifically, the first pad spring 14 attached to the first pad guide 3 of the attachment member 2 is rotated by the recess 11 </ b> D in which the contact portion 25 </ b> B of the pressing portion 25 is formed in the first ear portion 11. The direction outer wall surface 11D3 is always pressed in the direction indicated by the arrow C. On the other hand, the second pad spring 26 attached to the second pad guide 4 of the attachment member 2 has an outer wall surface in the rotational direction of the recess 12D in which the contact portion 37B of the pressing portion 37 is formed in the second ear portion 12. 12D3 is always pressed in the direction indicated by arrow D.

  As a result, when the brake operation is not performed, the pad 9 is not biased to either the turning-in side or the feeding-out side of the disc 1, and the pad 9 is at the substantially central portion of the mounting member 2 in the rotation direction of the disc 1. positioned. In this case, as shown in FIGS. 2 and 3, the contact portion 25B of the pressing portion 25 of the first pad spring 14 is formed on the bottom surface 11D1 of the recess 11D of the first ear portion 11 and the outer wall surface 11D3 in the rotational direction. It is in contact. The urging portion 22 of the first pad spring 14 presses the first ear portion 11 toward the outer side in the radial direction of the disc 1 and the outer side in the rotational direction of the disc 1.

  On the other hand, as shown in FIG. 4, the contact portion 37B of the pressing portion 37 of the second pad spring 26 is in contact with the bottom surface 12D1 of the recess 12D of the second ear 12 and the outer wall surface 12D3 in the rotational direction. . The urging portion 34 of the second pad spring 26 presses the second ear portion 12 toward the outer side in the radial direction of the disc 1 and the outer side in the rotational direction of the disc 1.

  Accordingly, the first and second ear portions 11 and 12 are pressed toward the support plate 17 of the guide plate portion 16 of the first and second pad springs 14 and 26, respectively. As a result, the pad 9 can be prevented from rattling in the radial direction of the disk 1. When the brake is operated, the first and second ear portions 11 and 12 of the pad 9 are held in sliding contact with the support plates 17 and 29 of the guide plate portions 16 and 28, respectively, while the inner side and the outer The side pad 9 can be smoothly guided along the guide plate portions 16 and 28 in the axial direction of the disk 1.

  In a brake operation when the vehicle is moving forward (when the disc 1 is rotating in the direction of arrow A), the lining 13 of the pad 9 is brought into frictional contact with the disc 1 and the pad 9 is dragged by the rotational force of the disc 1. Move in the direction of arrow D. The rotational direction outer side surface portion 12 </ b> A of the second ear portion 12 is in contact with the opposing plate 30 of the second pad spring 26.

  In this case, since the pad 9 is positioned at a substantially central portion of the mounting member 2 in the rotation direction of the disk 1 during non-braking, the second ear portion 12 is opposed to the opposing plate 30 of the second pad spring 26 during braking. The moving distance until contact is small. Therefore, it is possible to reduce abnormal noise (cloning sound) when the second ear portion 12 contacts the opposing plate 30 of the second pad spring 26. Then, the bottom portion 4A of the second pad guide 4 receives the braking torque that the pad 9 receives from the disc 1 via the rotation direction outer side surface portion 12A of the second ear portion 12 and the opposing plate 30 of the second pad spring 26. I accept.

  In this state, the second ear portion 12 is in a semi-fixed state in which the second ear portion 12 is pressed toward the counter plate 30 of the second pad spring 26, so that rattling is reduced. On the other hand, the 1st ear | edge part 11 is in the unstable state in which the clearance gap is formed between the opposing plates 18 of the 1st pad spring 14. FIG. However, the first ear portion 11 moves against the urging force of the urging portion 22 of the first pad spring 14 to the outside in the rotation direction of the disk 1. Therefore, the restraining force of the first ear portion 11 is increased by the biasing force of the biasing portion 22 of the first pad spring 14 in the direction indicated by the arrow C. As a result, the pad 9 can maintain a stable posture, and as a result, brake noise can be reduced.

  Further, as shown in FIG. 5, the disk 1 rotating in the direction of arrow A and the lining 13 of the pad 9 are brought into frictional contact with the second ear portion 12 of the pad 9, thereby moving in the direction of arrow E. A moment is generated. However, since the urging portion 22 of the first pad spring 14 is urging toward the arrow C direction so as to cancel (or reduce) the moment in the arrow E direction, the posture of the pad 9 is stabilized. The brake squeal can be reduced as a result.

  When the brake operation is released, the supply of hydraulic pressure to the piston 5 </ b> D is stopped, so that the inner side pad 9 and the outer side pad 9 are separated from the disk 1. Further, each pad 9 moves to a substantially central portion of the mounting member 2 in the rotation direction of the disk 1 by the urging force of the urging portion 22 of the first pad spring 14 in the direction indicated by the arrow C.

  On the other hand, in a brake operation when the vehicle is moving backward (when the disk 1 is rotating in the direction indicated by the arrow B), the lining 13 of the pad 9 is brought into frictional contact with the disk 1 and the pad 9 is moved in the direction indicated by the arrow C. Also in this case, since the pad 9 is located substantially at the center of the mounting member 2 during non-braking, the first ear 11 is in contact with the opposing plate 18 of the first pad spring 14 during braking. The moving distance is small. Therefore, it is possible to reduce abnormal noise (cloning sound) when the first ear portion 11 contacts the opposing plate 18 of the first pad spring 14.

  Further, the restraining force of the second ear 12 is increased by the biasing force of the biasing portion 34 of the second pad spring 26 in the direction indicated by the arrow D. Further, the moment generated in the first ear portion 11 by the frictional contact between the disk 1 rotating in the direction indicated by the arrow B and the lining 13 of the pad 9 is indicated by the arrow of the biasing portion 34 of the second pad spring 26. Reduced by the urging force in the D direction. As a result, the posture of the pad 9 can be maintained in a stable state even during a brake operation when the vehicle is moving backward, and the brake noise can be reduced.

  Thus, in the present embodiment, the first and second pad springs 14 and 26 are configured to pull the pad 9 outwardly in the rotational direction of the disk 1. That is, the first pad spring 14 located on the side of the disk 1 rotating in the direction indicated by the arrow A is attached with the first ear portion 11 of the pad 9 facing the bottom portion 3A side of the first pad guide 3. (Pressing) On the other hand, the second pad spring 26 located on the delivery side of the disk 1 rotating in the direction indicated by the arrow A is attached with the second ear portion 12 of the pad 9 facing the bottom portion 4A side of the second pad guide 4. (Pressing)

  As a result, the urging force of the ears 11 and 12 on the side not receiving the braking torque to the outside in the rotational direction of the disk 1 can be increased during any braking operation at the time of vehicle forward and reverse. . As a result, the posture of the pad 9 can be maintained in a stable state, and as a result, brake noise can be reduced.

  In the above-described embodiment, the first and second pad springs 14 and 26 are the first and second pad guides 3 and 4 on the inner side and the first and second pad guides 3 and 3 on the outer side. As an example, a case where four pad springs 14 and 26 are provided separately, that is, a case where a total of four pad springs 14 and 26 are used is described. However, the present invention is not limited to this. For example, as in the modification shown in FIG. 8, a pad spring 41 is used in which the outer side and the inner side are connected by the connecting plate 42 and are integrally attached to the outer side and inner side pad guides. May be.

  In the above-described embodiment, the first pad spring 14 is arranged with respect to the radial direction of the disk 1, the urging portion 22 is disposed on the inner side, and the support plate 17 is disposed on the outer side. The case where the ear portion 11 is elastically biased toward the outer side in the radial direction and the outer side in the rotational direction of the disk 1 has been described as an example. However, the present invention is not limited to this. For example, the positional relationship between the urging portion and the support plate may be reversed with respect to the radial direction of the disk. That is, with respect to the radial direction of the disk, the urging portion is disposed on the outer side and the support plate is disposed on the inner side, and the first ear portion of the pad is directed toward the inner side in the radial direction of the disk and the outer side in the rotational direction. It may be elastically biased. The same applies to the second pad spring 26.

  Further, in the above-described embodiment, the case where the urging portions 22 constituting the first pad spring 14 are provided at two positions separated in the axial direction of the disk 1 has been described as an example. However, the present invention is not limited to this, and for example, the urging portion may be provided with the same length as the axial length of the disc of the seating surface plate, or may be provided at three or more locations separated in the axial direction of the disc 1.

  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 pad 9 on the outer side. The case of a 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.

  As a disc brake based on the above-described embodiment, for example, the following one can be considered.

  As a first aspect, an attachment member having first and second pad guides attached to a non-rotating part of a vehicle, formed on the outer peripheral side of the disk in the axial direction and spaced apart in the rotation direction of the disk; A caliper that is slidably provided on the mounting member, and a first caliper that is provided on both sides of the disk and disposed on the first and second pad guides of the mounting member at both ends in the rotational direction of the disk. A first pair of pads that are pressed against the disk by the caliper, and the first and second pad guides that are attached to the first and second pad guides of the attachment member, respectively. In a disc brake comprising first and second pad springs that support the pads via ears, the pads are attached to the first and second pad springs. Urging portion for urging the outside of the rotation direction of the serial disk is provided.

  As a second aspect, in the first aspect, the first and second pad guides of the attachment member include a bottom portion provided on the outer side in the rotation direction of the disc, and a diameter of the disc with respect to the bottom portion. An inner wall portion provided on the inner side in the direction and an outer wall portion provided on the outer side in the radial direction of the disk with respect to the bottom portion, and the first and second ear portions of the pads are The first and second pad guides have a rotation direction outer surface facing the bottom, an inner surface facing the inner wall, and an outer surface facing the outer wall. A second pad spring is fitted between the first and second pad guides and the first and second ear portions of the pad, respectively, and the first and second ear portions of the pad are fitted to each other. A guide plate for guiding in the axial direction of the disk, and from the guide plate And a said biasing portion provided out.

  As a third aspect, in the second aspect, the first and second ear portions of each pad are formed with concave portions that are recessed from the inner side surface portion toward the outer side in the radial direction of the disk, The urging portions of the first and second pad springs are folded back at an extension portion extending from the guide plate portion toward the inner side in the radial direction of the disk, and at the tip side of the extension portion. A folding part, and a pressure that extends from the folding part toward the recessed part of the ear part and has a distal end located in the recessed part to press the first and second ear parts of the pad toward the bottom part side Part.

DESCRIPTION OF SYMBOLS 1 Disc 2 Mounting member 3 1st pad guide 3A Bottom part 3B Inner side wall part 3C Outer wall part 4 Second pad guide 4A Bottom part 4B Inner side wall part 4C Outer side wall part 5 Caliper 9 Pad 11 First ear part 11A Rotation direction Outer side surface portion 11B Inner side surface portion 11C Outer side surface portion 11D Recessed portion 12 Second ear portion 12A Rotational direction outer side surface portion 12B Inner side surface portion 12C Outer side surface portion 12D Recessed portion 14 First pad spring 16 Guide plate portion 22 Energizing portion 23 Extending portion 24 Folding portion 25 pressing part 26 second pad spring 28 guide plate part 34 urging part 35 extending part 36 folding part 37 pressing part

Claims (3)

An attachment member that is attached to a non-rotating part of the vehicle, has first and second pad guides that are formed across the outer peripheral side of the disc in the axial direction and are spaced apart in the rotational direction of the disc;
A caliper provided slidably on the mounting member;
The first and second ears are provided on both sides of the disk, and disposed on the first and second pad guides of the mounting member at both ends in the rotation direction of the disk. A pair of pads pressed against the disk by a caliper;
In a disc brake provided with first and second pad springs that are respectively attached to the first and second pad guides of the attachment member and support the pads via the first and second ear portions. ,
The disc brake according to claim 1, wherein each of the first and second pad springs is provided with an urging portion for urging each of the pads toward the outside in the rotation direction of the disc. The first and second pad guides of the mounting member include a bottom portion provided on the outer side in the rotation direction of the disc, an inner wall portion provided on the inner side in the radial direction of the disc with respect to the bottom portion, and the bottom portion. Having an outer wall provided on the outer side in the radial direction of the disk,
The first and second ears of each pad include a rotation direction outer surface facing the bottom of the first and second pad guides, an inner surface facing the inner wall, and the outer wall. An outer surface portion facing the portion,
The first and second pad springs are respectively fitted between the first and second pad guides and the first and second ear portions of the pad, and the first and second pad springs. 2. The disc brake according to claim 1, further comprising: a guide plate portion that guides an ear portion of the disc in the axial direction of the disc; and the urging portion that extends from the guide plate portion. . The first and second ears of each pad are formed with recesses that are recessed from the inner side surface toward the outside in the radial direction of the disk,
The urging portions of the first and second pad springs are folded back at an extension portion extending from the guide plate portion toward the inner side in the radial direction of the disk, and at the tip side of the extension portion. A folding part, and a pressure that extends from the folding part toward the recessed part of the ear part and has a distal end located in the recessed part to press the first and second ear parts of the pad toward the bottom part side The disc brake according to claim 2, wherein the disc brake is constituted by a portion.

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