JP2015197143A - disc brake - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a disc brake capable of stably supporting a friction pad by a pad spring.SOLUTION: A pad spring 11 has a guide plate portion 15 mounted while being kept into contact with a pad guide 3 of a mounting member 2, and guiding a friction pad 8 in an axial direction of a disc 1, and a radial energizing portion 19 extended from the guide plate portion 15 and energizing the friction pad 8 in the radial direction of the disc 1. The radial energizing portion 19 has a first extension portion 20 extended from an opposite plate portion 17 of the guide plate portion 15 opposed to a depth-side wall surface 3C of the pad guide 3 in the axial direction of the disc 1, a curl portion 21 extended to a radial inner part of the disc 1 at a tip 20A side of the first extension portion 20 and folded back to be extended in a rotating direction of the disc 1, and a second extension portion 22 extended to a radial outer part of the disc 1 in the direction to approach the disc 1 from a tip 21B1 of the curl portion 21 obliquely to the axial direction of the disc 1, and kept into contact with the friction pad 8.

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 includes an attachment member attached to a non-rotating portion of the vehicle and having a concave pad guide, a caliper provided slidably on the attachment member, and a pad of the attachment member Consists of a pair of friction pads that have protrusions that are inserted into the guide and that are pressed against both sides of the disk by the caliper, and pad springs that are attached to the mounting member and elastically support the friction pads. Has been.

  The pad spring is fitted and attached to the pad guide of the mounting member and guides the friction pad in the axial direction of the disk. The pad spring extends from the guide plate and is provided in the radial direction of the disk. And a radial urging portion for urging (see, for example, Patent Document 1).

JP 2008-298198 A

  By the way, the pad spring by patent document 1 mentioned above has a possibility that a press part may contact the lower part of a guide plate part (guide part), when a friction pad is assembled | attached, and this says that a spring load becomes unstable. There's 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 in which a pad spring can stably support a friction pad.

  In order to solve the above-described problems, a disc brake according to the present invention includes a mounting member attached to a non-rotating portion of a vehicle and having a concave pad guide, a caliper provided slidably on the mounting member, and the mounting member. A pair of friction pads that are pressed against both sides of the disk by the caliper, and pad springs that are attached to the attachment member and elastically support the friction pads, It has.

  A feature of one configuration employed by the present invention is that the pad spring is attached so as to be able to abut on a disk radial outer side surface and a bottom portion of the pad guide of the mounting member, and the friction pad is attached to the axial direction of the disk. And a radial urging portion that extends from the guide plate portion and urges the friction pad in a radial direction of the disk. A first extending portion extending in the axial direction of the disc from the facing surface portion of the guide plate portion facing the bottom portion of the pad guide, and extending inward in the radial direction of the disc on the tip side of the first extending portion. A curled portion extending in the rotational direction of the disc, and formed to extend outward in the radial direction of the disc in a direction approaching the disc from the tip of the curled portion and obliquely with respect to the axial direction of the disc, and one surface side of the friction pad The other side It has a second extending portion which is arranged facing not through serial pad guide disk radially inward side of the guide plate portion.

  Another feature of the present invention is that the pad spring is formed in a U shape and is fitted and attached to the pad guide of the mounting member to guide the friction pad in the axial direction of the disk. A guide plate portion, and a radial urging portion that extends from the guide plate portion and urges the friction pad in the radial direction of the disk, and the radial urging portion of the pad guide A first extending portion extending in the axial direction of the disc from the outer side plate portion of the guide plate portion opposed to the outer side surface in the radial direction of the disc, and radially inward of the disc at the tip side of the first extending portion. An extending connecting plate portion, a curled portion that is folded back at the leading end side of the connecting plate portion and extends in the rotating direction of the disc, and a disc shaft that is radially outward of the disc in a direction approaching the disc from the leading end of the curled portion. The friction pad extending obliquely with respect to the direction Has a second extending portion which abuts, the.

  According to the present invention, the friction pad can be stably supported by the pad spring.

It is the top view which looked at the disc brake by this Embodiment from the upper part. It is the front view which looked at the disc brake from the arrow II-II direction in FIG. It is a front view of the principal part expansion which shows the (III) part in FIG. FIG. 4 is a cross-sectional view of a mounting member, a friction pad, a pad spring, and the like viewed from the direction of arrows IV-IV in FIG. 2 with the caliper removed. It is a perspective view of the principal part expansion which shows the attachment member before attaching a friction pad in the state which removed the caliper, a pad spring, etc. FIG. 6 is an enlarged perspective view of a main part viewed from the same position as in FIG. 5, showing a state in which the friction pad is assembled to the mounting member in a state where the caliper is removed. It is a front view which shows the pad spring of 1st Embodiment alone. It is the side view which looked at the pad spring of 1st Embodiment from the arrow VIII-VIII direction in FIG. It is a perspective view which shows the pad spring of 1st Embodiment alone. It is a perspective view of the principal part expansion which shows an attachment member, a pad spring, etc. before attaching a friction pad in the state which removed the caliper in 2nd Embodiment. It is a front view which shows the pad spring of 2nd Embodiment alone. It is the top view which looked at the pad spring of 2nd Embodiment from the arrow XII-XII direction in FIG.

  Hereinafter, the disc brake according to the present embodiment will be described in detail with reference to FIGS. First, the overall configuration of the disc brake will be described with reference to FIGS. 1 to 3, the pad spring 11 as the first embodiment will be described according to FIGS. 4 to 9, and the pad spring 31 as the second embodiment. This will be described 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 attachment member 2 is attached to a non-rotating part of the vehicle. As shown in FIGS. 1 to 4, 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 a thick support portion 2B, etc., which are provided so as to connect the base end sides of the respective arm portions 2A so as to be integrated, and are fixed to a non-rotating portion of the vehicle at a position on the inner side of the disc 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 2A1 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 (see FIG. 4). ). Inner side and outer side pad guides 3 to be described later are respectively formed on both sides in the axial direction of the disk 1 of the disk path portion 2A1. Each arm 2A is provided with a pin hole (not shown). In these pin holes, a slide pin 5 described later is slidably inserted.

  A pair of pad guides 3 are provided on the arm portion 2A of the mounting member 2 so as to be separated from each other in the rotation direction of the disk 1 (left and right in FIG. 2). As shown in FIG. 3, the pad guide 3 has an outer diameter wall surface (hereinafter referred to as an upper wall surface 3 </ b> A) that is located on the outer side in the radial direction of the disk 1 and an inner side in the radial direction of the disk 1. The inner wall surface (hereinafter referred to as the lower wall surface 3B), which is the inner surface of the disk in the radial direction of the disk, and the rear wall surface 3C as the bottom portion connecting these wall surfaces 3A and 3B on the back side. . The pad guide 3 has a concave shape (a U-shaped cross section) by these wall surfaces 3A, 3B, 3C, and the upper wall surface 3A and the lower wall surface 3B are spaced apart from each other in the upper and lower directions in FIG. It is arranged.

  That is, the pad guide 3 is formed so that protrusions 9A and 9B of a friction pad 8 to be described later are sandwiched between the upper wall surface 3A and the lower wall surface 3B from above and below (the radial direction of the disk 1). The friction pad 8 is guided in the axial direction of the disk 1 between the wall surfaces 3A and 3B. In addition, an inclined plate 22A of a second extending portion 22 of a pad spring 11 to be described later is positioned on the outer side in the radial direction of the disk 1 at an end portion 3B1 on the side where a friction pad 8 to be described later is inserted in the lower side wall surface 3B. It is the composition to do. Further, the back side wall surface 3C of the pad guide 3 functions as a so-called torque receiving portion, and receives the braking torque received by the friction pad 8 from the disk 1 during braking operation via a protruding side protruding portion 9B described later. It is.

  That is, among the left and right pad guides 3 and 3 in FIG. 2, the pad guide 3 on the left side in the drawing, which is located on the rotation direction exit side (hereinafter referred to as the “return side”) of the disk 1 rotating in the arrow A direction. In particular, the back side wall surface 3C is provided with a protruding portion 9B of the back plate 9 of the friction pad 8 and a later-described protrusion 9B of the friction pad 8 that receives the braking torque received from the disk 1 by the friction pad 8 described later when the vehicle is traveling in the forward direction. The pad spring 11 is received through the guide plate portion 15. Further, the back side wall surface 3C of the right 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 indicated by the arrow A is used during a brake operation when the vehicle is moving backward. A braking torque received by the friction pad 8 (described later) from the disk 1 is received via a protruding portion 9A of the back plate 9 of the friction pad 8 and a guide plate portion 15 of the pad spring 11 (described later).

  The caliper 4 is slidably provided on the mounting member 2. As shown in FIG. 1, the caliper 4 includes an inner leg 4A 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 4B extending from the portion 4A to the outer side, which is the other side of the disc 1, and a radially inward direction of the disc 1 extending from the outer side, which is the tip side of the bridge portion 4B, with the tip side being trifurcated And the outer leg portion 4C as the claw portion.

  The inner leg 4A of the caliper 4 is formed with a cylinder (not shown) into which the two pistons 4D and 4D are slidably inserted side by side in the rotational direction of the disk 1. Further, the inner leg portion 4A is provided with a pair of attachment portions 4E and 4E protruding in the left and right directions in FIG. Each mounting portion 4E supports the entire caliper 4 to be slidable on each arm portion 2A of the mounting member 2 via a sliding pin 5 described later.

  As shown in FIG. 1, the sliding pin 5 is fastened to each mounting portion 4 </ b> E of the caliper 4 using a bolt 6. The distal end side of each sliding pin 5 extends toward the pin hole of each arm portion 2 </ b> A of the mounting member 2, and is slidably inserted into each pin hole of the mounting member 2. A protective boot 7 is attached between each arm 2A and each sliding pin 5, as shown in FIG. 1, and rainwater or the like enters between the sliding pin 5 and the pin hole of the arm 2A. Is preventing.

  The inner friction pad 8 and the outer friction pad 8 are disposed to face both surfaces of the disk 1. Each friction pad 8 is provided with a flat plate-like back plate 9 extending substantially in the shape of a fan in the rotation direction (circumferential direction) of the disk 1, and fixed to the surface of the back plate 9, and is in frictional contact with the surface of the disk 1. And a lining 10 (see FIG. 1) as a friction material.

  The back plate 9 of the friction pad 8 has projecting portions 9 </ b> A and 9 </ b> B having convex shapes on the side surface portions located on both sides in the rotational direction of the disk 1. The protrusions 9A and 9B are formed on the outer side in the radial direction 9A1, 9B1 located on the outer side in the radial direction of the disk 1, the outer side in the rotating direction 9A2, 9B2 located on the outer side in the rotational direction of the disk 1, and the diameter of the disk 1. It has radial inner side surfaces 9A3 and 9B3 located on the inner side in the direction, and is concavo-convexly fitted to the pad guide 3 of the mounting member 2. As a result, the friction pad 8 is movable in the axial direction of the disk 1. The projecting portions 9A and 9B constitute a torque transmitting portion that transmits the braking torque received by the friction pad 8 from the disk 1 when the vehicle is braked to the rear side wall surface 3C of the pad guide 3.

  The protrusions 9A and 9B of the friction pad 8 (back plate 9) are formed symmetrically to the left and right and have the same shape. One projecting portion 9A is disposed 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 projecting portion 9B is disposed on the rotation direction exit side of the disk 1. It is arranged on the (delivery side).

  Next, the pad spring 11 according to the first embodiment will be described.

  A pair of pad springs 11, 11 are attached to each arm 2 </ b> A of the attachment member 2. The pad springs 11 elastically support the inner and outer friction pads 8 and smooth the sliding displacement of the friction pads 8 in the axial direction of the disk 1.

  The pad spring 11 includes a connecting plate portion 12, a flat plate portion 13, an engaging plate portion 14, a guide plate portion 15, and a radial urging portion 19 which will be described later. In the following description, the terms “upper”, “upper surface”, or “upward” are used to refer to the radially outward direction, the radially outward surface, or the radially outward direction of the disk 1 for each part of the pad spring 11. As used herein, the terms “lower”, “lower surface” or “downward” are used to mean the radially inward, radially inward surface, or radially inward of the disk 1. .

  The connecting plate portion 12 of the pad spring 11 extends in the axial direction in a state of straddling the outer peripheral side of the disc 1 in order to integrally connect each guide plate portion 15 to be described later on the inner side and the outer side of the disc 1. Is formed. A pair of flat plate portions 13 and 13 are integrally formed on both ends of the connecting plate portion 12 in the length direction so as to extend inward in the radial direction of the disk 1.

  The engaging plate portion 14 is located between the pair of flat plate portions 13 and 13 and is formed integrally with the connecting plate portion 12 and is engaged with the disk path portion 2A1 of the arm portion 2A from the inside in the radial direction. Installed on. As a result, the pad spring 11 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 plate portions 15 and 15 are provided on both end sides of the connecting plate portion 12 via the flat plate portions 13. Each guide plate portion 15 is formed by being bent into a substantially inverted L shape from the lower end (front end side) of the flat plate portion 13. Of the pair of guide plate portions 15, one guide plate portion 15 is disposed in the inner side pad guide 3, and the other guide plate portion 15 is disposed in the outer side pad guide 3. And the guide plate parts 15 and 15 are comprised by the upper-surface board part 16 and the opposing board part 17 as an opposing surface part.

  The upper surface plate portion 16 of the guide plate portion 15 is formed by bending approximately 90 degrees from the lower end side of the flat plate portion 13 and extends outward in the rotation direction of the disk 1. When the pad spring 11 is attached to the attachment member 2, the upper surface plate portion 16 faces the upper wall surface 3 </ b> A that is the inner surface in the disk radial direction of the pad guide 3 and is in contact with the upper wall surface 3 </ b> A. . Further, the upper surface plate portion 16 is disposed so as to oppose a second extending portion 22 of a radial urging portion 19 described later in the radial direction of the disk 1. The upper surface plate portion 16 has radially outer surfaces 9A1 and 9B1 which are on the upper surface side (the radially outer side of the disk 1) of the protruding portions 9A and 9B of the friction pad 8 by the urging force of the radial urging portion 19. Abut.

  In addition, an insertion guide 16A that protrudes outward in the axial direction of the disk 1 and has a tip (projecting end) side obliquely inclined outward in the radial direction of the disk 1 is integrally formed on the upper surface plate portion 16. The insertion guide 16A protrudes when the protruding portions 9A and 9B of the friction pad 8 are inserted between the upper surface plate portion 16 of the guide plate portion 15 and the second extending portion 22 of the radial urging portion 19. It is provided to smoothly guide the portions 9A and 9B to the inside of the guide plate portion 15.

  The counter plate portion 17 extends from the upper surface plate portion 16 inward in the radial direction of the disk 1. When the pad spring 11 is attached to the attachment member 2, the opposing plate portion 17 is opposed to the back side wall surface 3 </ b> C as the bottom of the pad guide 3 and is in contact with the back side wall surface 3 </ b> C. Then, the rotation direction outer side surfaces 9A2 and 9B2 positioned on the outer side in the rotation direction of the disk 1 of the protrusions 9A and 9B of the friction pad 8 abut on the counter plate portion 17.

  Here, as shown in FIG. 8, the counter plate portion 17 is formed as an anti-cronk structure portion (inclined portion) inclined obliquely. That is, the counter plate portion 17 is formed with an angle formed with the upper surface plate portion 16 larger than 90 degrees. In other words, the counter plate portion 17 has an angle α (for example, α = for example) from the lower part of the back side wall surface 3C of the pad guide 3 (the radially inner side of the disk 1) with the pad spring 11 attached to the attachment member 2. 1 to 5 degrees), the disk 1 is inclined inward in the rotational direction. Thereby, a slight gap is formed between the back side wall surface 3 </ b> C of the pad guide 3 and the opposing plate portion 17.

  Then, the protrusions 9A and 9B of the friction pad 8 are urged from the counter plate portion 17 toward the inner side in the rotational direction of the disk 1 (center side of the friction pad 8) by the anti-cronk structure portion. As a result, the rattling of the friction pad 8 can be suppressed, and the sudden impact of the protrusions 9A and 9B of the friction pad 8 on the back side wall surface 3C of the pad guide 3 can be reduced during brake operation. Therefore, generation | occurrence | production of pad noise (rattle sound and cronk sound) can be suppressed.

  Thus, the guide plate portion 15 is formed in a substantially inverted L shape by the upper surface plate portion 16 and the counter plate portion 17. The guide plate portion 15 is disposed and attached in the pad guide 3, so that the lower wall surface 3 </ b> B of the pad guide 3 is not covered by the guide plate portion 15.

  Next, the radial urging portion 19 according to the first embodiment will be described.

  The radial urging portion 19 is provided so as to extend from the guide plate portion 15 and is formed on the radial inner side surfaces 9A3 and 9B3 which are the lower surface sides (inward in the radial direction of the disk 1) of the protruding portions 9A and 9B of the friction pad 8. Abutting in an elastically deformed state, the friction pad 8 is urged outward in the radial direction of the disk 1. Thereby, it can suppress that the friction pad 8 rattles with respect to the attachment member 2. FIG. The radial urging portion 19 includes a first extending portion 20, a curled portion 21, and a second extending portion 22.

  The first extending portion 20 is provided so as to extend outward from the counter plate portion 17 in the axial direction of the disk 1, and is disposed on the same plane as the counter plate portion 17. The first extending portion 20 is formed when the protruding portions 9A and 9B of the friction pad 8 are inserted between the upper surface plate portion 16 of the guide plate portion 15 and a second extending portion 22 described later. 9B can be smoothly guided to the inside of the guide plate portion 15.

  The first extending portion 20 is predetermined in the radial direction of the disc 1 from the end portion of the counter plate portion 17 that is closer to the outer side in the radial direction of the disc 1 (that is, the end portion closer to the upper surface plate portion 16). It extends in the axial direction of the disk 1 with a width dimension. Thereby, since the 1st extension part 20 can ensure required rigidity, when the friction pad 8 is assembled | attached to the attachment member 2, for example, the float of the pad spring 11 with respect to the pad guide 3 is suppressed. be able to. The first extending portion 20 connects a curling portion 21 and a second extending portion 22 to be described later to the counter plate portion 17 of the guide plate portion 15, and the curling portion 21 and the second extending portion 22 are to be described later. An elastic biasing force is generated stably.

  An insertion guide 20B that is inclined obliquely outward in the rotational direction of the disk 1 is integrally formed on the outer side in the radial direction of the disk 1 on the distal end 20A side of the first extension portion 20. The insertion guide 20B protrudes when the protruding portions 9A and 9B of the friction pad 8 are inserted between the upper surface plate portion 16 of the guide plate portion 15 and the second extending portion 22 of the radial biasing portion 19. The portions 9A and 9B can be smoothly guided to the inside of the guide plate portion 15.

  The curling portion 21 constituting the radial urging portion 19 extends inward in the radial direction of the disk 1 on the tip 20 </ b> A side of the first extending portion 20 and extends in the rotational direction of the disk 1. Specifically, the curled portion 21 extends from the radially inner side of the disk 1 on the tip 20 </ b> A side of the first extending portion 20 toward the outer side in the rotational direction of the disk 1. A folded portion 21A that is bent in a substantially C-shape or a substantially U-shape toward the disk 1 and an extending portion 21B that extends inward in the rotational direction of the disk 1 from the tip of the folded portion 21A. .

  The folded portion 21A protrudes outward in the rotational direction of the disk 1 from the radially inward side of the disk 1 on the distal end 20A side of the first extending portion 20, and is substantially C-shaped or substantially U-shaped. It is formed in a curved shape. In addition, a second extending portion 22 to be described later is integrally formed at the distal end 21B1 of the extending portion 21B and extends and bends (changes direction) in a substantially L shape in the axial direction of the disk 1.

  The second extending portion 22 constituting the radial urging portion 19 is arranged radially outward of the disc 1 in the direction approaching the disc 1 from the tip 21B1 of the extending portion 21B of the curled portion 21 and in the axial direction of the disc 1. On the other hand, it extends diagonally. In other words, the second extending portion 22 bends approximately 90 degrees with respect to the tip 21 B 1 of the curled portion 21 and extends obliquely in a direction approaching the disk 1. In other words, the second extending portion 22 changes its direction in the direction of approaching the disk 1 at the tip 21B1 of the extending portion 21B of the curled portion 21, so that the curled portion 21 and the second extending portion 22 are seen in a plan view. It is integrally formed in a substantially L shape.

  The second extending portion 22 is formed as a thin spring piece having a first bent portion 22A1 and a second bent portion 22B1, and is configured in two steps by an inclined plate 22A and a contact plate 22B. Yes.

  As shown in FIG. 7, the base end side of the inclined plate 22A is integrally formed with the tip 21B1 of the curled portion 21 at the position of the first bent portion 22A1, and the first bent portion 22A1 extends in the axial direction of the disc 1. On the other hand, it is inclined to form an angle θ1. As a result, the inclined plate 22A extends obliquely from the tip 21B1 of the extending portion 21B of the curled portion 21 to the center position of the opposing plate portion 17 of the guide plate portion 15 with an angle θ1 with respect to the axial direction of the disc 1. Yes.

  A contact plate 22B is integrally formed on the tip side of the inclined plate 22A. A second bent portion 22B1 that forms an angle θ2 with respect to the axial direction of the disk 1 is formed on the proximal end side of the contact plate 22B, that is, on the distal end side of the inclined plate 22A. Thus, the contact plate 22B extends obliquely from the tip of the inclined plate 22A in a direction approaching the disk 1 with an angle θ2 with respect to the axial direction of the disk 1.

  In a state before the protruding portions 9A and 9B of the friction pad 8 are inserted into the guide plate portion 15, the friction pad 8 (back plate 9) is interposed between the contact plate 22B and the upper surface plate portion 16. A gap for sandwiching the protruding portions 9A and 9B is formed.

  Here, the angle θ1 of the inclined plate 22A by the first bent portion 22A1 is formed larger than the angle θ2 of the contact plate 22B by the second bent portion 22B1. Thereby, the inclination angle of the second extending portion 22 with respect to the axial direction of the disk 1 is large between the tip 21B1 of the curled portion 21 and the guide plate portion 15.

  As a result, when the protruding portions 9A and 9B of the friction pad 8 are inserted between the upper surface plate portion 16 of the guide plate portion 15 and the contact plate 22B, the second extending portion 22 becomes the lower side wall surface of the pad guide 3. It can suppress contacting 3B and edge part 3B1 (refer FIG. 4, FIG. 6). As a result, the radial biasing portion 19 can ensure a stable spring load when biasing the friction pad 8 in the radial direction of the disk 1.

  Further, the abutting plate 22B is a plate body having a flat upper surface, and the length dimension (the dimension in the disc axial direction) of the abutting plate 22B is the axial direction of the disc 1 of the opposing plate portion 17 of the guide plate portion 15. It is formed slightly smaller than the length dimension. Thus, when the protruding portions 9A and 9B of the friction pad 8 are inserted between the upper surface plate portion 16 of the guide plate portion 15 and the contact plate 22B, the tip side of the contact plate 22B protrudes from the guide plate portion 15. Thus, interference with the surface of the disk 1 can be avoided, and the radially inner side surfaces 9A3 and 9B3 of the protrusions 9A and 9B of the friction pad 8 can be smoothly slid on the contact plate 22B.

  When the protruding portions 9A, 9B of the friction pad 8 are inserted into the guide plate portion 15 of the pad spring 11, the radial biasing portion 19 has the second extending portion 22 of the protruding portions 9A, 9B of the friction pad 8. And the lower side wall surface 3B of the pad guide 3 are elastically deformed so as to be located. In this state, the curled portion 21 and the second extending portion 22 of the radial urging portion 19 allow the protruding portions 9A and 9B of the friction pad 8 (back plate 9) to be radially outward of the disk 1 (that is, the guide plate). It is elastically biased toward the upper surface plate portion 16) of the portion 15 to prevent the friction pad 8 from rattling in the radial direction of the disk 1 with respect to the mounting member 2.

  In this case, the second extending portion 22 is configured to change its direction from the tip 21B1 of the extending portion 21B of the curled portion 21 in a direction approaching the disc 1. That is, since the second extending portion 22 and the curled portion 21 are formed in a substantially L shape, the second extending portion 22 extends from the folded portion 21A of the curled portion 21 inward in the rotation direction of the disk 1. It is arranged at a position shifted (offset).

  When the curled portion 21 bends (elastically deforms) inward in the radial direction of the disk 1, the extending portion 21 </ b> B of the curled portion 21 is inclined from the folded portion 21 </ b> A toward the radially inward direction of the disc 1. To do. Accordingly, the second extending portion 22 is inclined toward the inside in the radial direction of the disk 1. As a result, the friction pad 8 is supported in a point contact state between the radially inner side surfaces 9A3 and 9B3 of the protruding portions 9A and 9B and the contact plate 22B of the second extending portion 22 of the pad spring 11. The sliding displacement of the friction pad 8 in the axial direction of the disk 1 can be made smooth.

  Further, a load is applied to the pad spring 11 inward in the radial direction of the disk 1 by the friction pad 8. For this reason, there is a possibility that a gap is formed between the upper surface plate portion 16 of the pad spring 11 and the pad guide 3. However, since the pad spring 11 of the first embodiment forms the first extending portion 20 with a size that can ensure the required rigidity, the upper surface plate portion 16 and the pad guide 3 It is possible to suppress the generation of a gap between them, and as a result, it is possible to suppress the floating of the pad spring 11 and the like, so that the friction pad 8 can be slid smoothly and the anti-cronk structure is stabilized. Therefore, pad noise can be suppressed.

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

  First, when braking the vehicle, the brake fluid pressure is supplied to the inner leg portion 4A (cylinder) of the caliper 4 so that the two pistons 4D arranged in the rotation direction of the disc 1 are slid toward the disc 1 and displaced. As a result, the inner friction pad 8 is pressed against one side of the disk 1. At this time, since the caliper 4 receives a pressing reaction force from the disc 1, the entire caliper 4 is slid to the inner side with respect to the arm portion 2A of the mounting member 2, and the outer leg portion 4C is a friction pad on the outer side. 8 is pressed against the other side of the disk 1.

  As a result, the inner and outer friction pads 8 strongly hold the disc 1 rotating in the direction indicated by the 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 4D is stopped, so that the inner and outer friction pads 8 are separated from the disk 1 and return to the non-braking state again.

  Further, the protruding portion 9A of the friction pad 8 is urged toward the delivery side of the disk 1 by an anti-cronk structure portion formed by inclining the opposing plate portion 17 of the pad spring 11, and the friction pad 8 The protruding portion 9B is urged toward the turn-in side of the disk 1 by an anti-cronk structure portion formed by inclining the opposing plate portion 17 of the pad spring 11. For this reason, it is possible to restrict the friction pad 8 from rattling in the rotation direction (circumferential direction) of the disk 1 due to vibrations or the like when the vehicle travels, by the anti-cronk structure portion.

  During braking operation when the vehicle is moving forward, the braking torque (rotational torque in the direction of arrow A) received by the friction pad 8 from the disc 1 is received by the arm portion 2A (the back side wall surface 3C of the pad guide 3) on the delivery side. I can accept it.

  In this case, the opposing plate portion 17 (anti-cronk structure portion) of the pad spring 11 urges the protruding portion 9B of the friction pad 8 from the opposing plate portion 17 toward the turn-in side of the disk 1, The projecting portion 9B is alleviated from suddenly colliding with the back side wall surface 3C of the pad guide 3 by the generated force.

  As a result, it is possible to suppress abnormal noise (rattle sound or cronk sound) generated when the friction pad 8 rattles and the friction pad 8 and the pad guide 3 collide or the friction pad 8 moves due to braking torque. .

  Further, the protrusions 9A and 9B of the friction pad 8 are inserted into the pad guide 3 located on the turn-in side and the turn-out side of the disk 1 via the guide plate portion 15 and the radial biasing portion 19 of the pad spring 11. The disk 1 is slidably inserted and is urged outward in the radial direction of the disk 1 by the radial urging portion 19.

  Therefore, it is possible to suppress the friction pad 8 from rattling in the radial direction of the disk 1 due to vibration during running or the like by the radial biasing portion 19 of the pad spring 11. During the brake operation, the inner and outer friction pads 8 are held in the guide plate portion while holding the protruding portions 9A and 9B of the friction pad 8 in sliding contact with the upper surface plate portion 16 side of the guide plate portion 15. 15 can be smoothly guided in the axial direction of the disk 1.

  By the way, the pad spring according to Patent Document 1 is provided with a lower surface plate of the guide plate portion between the radial urging portion and the lower side wall surface of the pad guide. For this reason, there is a possibility that the radial urging portion and the lower surface plate come into contact with each other due to the moment force around the pad contact surface generated during braking, and when these contact, the spring constant of the radial urging portion is reduced. It will change. As a result, the friction pad is not stably supported, and pad noise may occur.

  On the other hand, the pad spring 11 according to the first embodiment can come into contact with the upper side wall surface 3A as the outer side surface in the disk radial direction of the pad guide 3 of the mounting member 2 and the rear side wall surface 3C as the bottom portion. A guide plate 15 that is attached and guides the friction pad 8 in the axial direction of the disk 1, and a radial biasing portion 19 that extends from the guide plate 15 and biases the friction pad 8 in the radial direction of the disk 1. And have. And this radial direction urging | biasing part 19 is the 1st extension extended in the axial direction of the disk 1 from the opposing board part 17 as an opposing surface part of the guide board part 15 which opposes the back side wall surface 3C as a bottom part of the pad guide 3. FIG. Part 20, a curl part 21 that extends inward in the radial direction of the disk 1 on the tip side of the first extension part 20, and extends in the rotation direction of the disk 1, and from the tip of the curl part 21 to the disk 1. In the approaching direction, it is formed to extend radially outward of the disk 1 obliquely with respect to the axial direction of the disk 1, with one surface abutting against the friction pad 8 and the other surface as the disk radial inner side surface of the pad guide 3. And a second extending portion 22 arranged to face each other without the guide plate portion 15 interposed therebetween. With such a configuration, a clearance can be formed between the second extending portion 22 and the lower side wall surface 3B or the end portion 3B1 as the disk radial direction inner side surface of the pad guide 3, and the lower side wall surface 3B. And contact with the end 3B1 can be suppressed. Thereby, the curled part 21 and the second extending part 22 can apply a stable spring load to the friction pad 8.

  Next, a pad spring 31 according to a second embodiment will be described with reference to FIGS.

  The pad spring 31 according to the second embodiment is different from the pad spring 11 according to the first embodiment in the following points. As a first point, a lower surface plate portion 38 that is bent approximately 90 degrees from the lower end side of the opposing plate portion 37 of the guide plate portion 35 and extends inward in the rotation direction of the disk 1 is provided. The part 35 is a point formed in U shape or U shape. As a second point, the first extending portion 40 of the radial urging portion 39 extends from the upper surface plate portion 36 of the guide plate portion 35 in the axial direction of the disk 1, and at the tip side of the first extending portion 40. The connecting plate portion 43 extending inward in the radial direction of the disk 1 is connected to the curled portion 21.

  The guide plate portion 35 of the pad spring 31 according to the second embodiment is provided on both end sides of the connecting plate portion 12 via the flat plate portions 13, and is substantially from the lower end (front end side) of the flat plate portion 13. It is formed by being bent into a U shape or a U shape. The guide plate portion 35 includes an upper surface plate portion 36, an opposing plate portion 37, and a lower surface plate portion 38 as outer side surface plate portions.

  An upper surface plate portion 36 as an outer side surface plate portion of the guide plate portion 35 is formed by bending approximately 90 degrees from the lower end side of the flat plate portion 13 and extends outward in the rotation direction of the disk 1. When the pad spring 11 is attached to the attachment member 2, the upper surface plate portion 36 faces the upper wall surface 3 </ b> A that is the inner surface in the disk radial direction of the pad guide 3 and is in contact with the upper wall surface 3 </ b> A. . Further, the upper surface plate portion 36 is disposed so as to face a second extending portion 22 of a radial urging portion 39 described later in the radial direction of the disk 1. The upper surface plate portion 36 has radially outer surfaces 9A1 and 9B1 that become the upper surface side (the radially outer side of the disk 1) of the protrusions 9A and 9B of the friction pad 8 by the urging force of the radial urging portion 39. Abut.

  The counter plate portion 37 extends from the upper plate portion 16 toward the inside in the radial direction of the disk 1. When the pad spring 31 is attached to the attachment member 2, the counter plate portion 37 faces the back side wall surface 3 </ b> C as the bottom of the pad guide 3 and abuts on the back side wall surface 3 </ b> C. Then, the rotation direction outer side surfaces 9A2 and 9B2 positioned on the outer side in the rotation direction of the disk 1 of the protrusions 9A and 9B of the friction pad 8 abut on the counter plate portion 37.

  The lower surface plate portion 38 is provided by bending approximately 90 degrees from the lower end side of the opposing plate portion 37 and extending inward in the rotation direction of the disk 1. The lower face plate portion 38 faces the lower wall surface 3B of the pad guide 3 and contacts the lower wall surface 3B when the pad spring 31 is attached to the attachment member 2.

  The radial urging portion 39 is provided so as to extend from the guide plate portion 35 and is formed on the radial inner side surfaces 9A3 and 9B3 which are the lower surface sides (inward in the radial direction of the disk 1) of the protrusions 9A and 9B of the friction pad 8. Abutting in an elastically deformed state, the friction pad 8 is urged outward in the radial direction of the disk 1. Thereby, it can suppress that the friction pad 8 rattles with respect to the attachment member 2. FIG. The radial urging portion 39 includes a first extending portion 40, a connecting plate portion 43, a curled portion 21, and a second extending portion 22.

  The first extending portion 40 is provided so as to extend from the upper surface plate portion 36 which is the outer side surface in the radial direction of the disk of the pad guide 3 to the outer side in the axial direction of the disk 1, and is disposed on the same plane as the upper surface plate portion 36. Has been.

  The front end 40 </ b> A side of the first extending portion 40 is connected to a connecting plate portion 43 extending inward in the radial direction of the disk 1 after being directed in the rotation direction of the disk 1, and this connecting plate portion 43. The tip end side 43A is connected to the curl portion 21 similar to that of the first embodiment.

  Here, at the time of braking, the rotation direction outer side surfaces 9A2 and 9B2 of the protrusions 9A and 9B of the friction pad 8 may come into contact with the counter plate portion 37, and the counter plate portion 37 may be moved by the braking torque of the friction pad 8. is there. As in the first embodiment, when the first extending portion 20 is provided so as to extend outward from the opposing plate portion 17 in the axial direction of the disk 1, the proximal end of the radial biasing portion 19 moves. Therefore, there is a possibility that the angle of the second extending portion 22 with respect to the lower wall surface 3B of the pad guide 3 changes and contacts the lower wall surface 3B. If the second extending portion 22 comes into contact with the lower side wall surface 3B, a stable spring load cannot be secured when the friction pad 8 is urged in the radial direction of the disk 1.

  On the other hand, since the first extending portion 40 of the present embodiment is formed extending from the upper surface plate portion 36, the rotation direction of the protruding portions 9A and 9B of the friction pad 8 on the opposing plate portion 37 during braking. Even when the outer side surfaces 9A2 and 9B2 come into contact with each other and move by the braking torque of the friction pad 8, contact with the lower surface plate portion 38 of the second extending portion 22 can be suppressed without being affected by the movement. For this reason, a stable spring load can be ensured when the friction pad 8 is urged in the radial direction of the disk 1.

  As described above, in the disc brake of the second embodiment, the pad spring 31 is formed in a U-shape and is fitted and attached to the pad guide 3 of the mounting member 2 to attach the friction pad 8 to the disc 1. A guide plate portion 35 that guides in the axial direction, and a radial biasing portion 39 that extends from the guide plate portion 35 and biases the friction pad 8 in the radial direction of the disk 1 are provided. The radial urging portion 39 extends from the upper surface plate portion 36 as the outer side surface plate portion of the guide plate portion 35 facing the upper wall surface 3A as the disk radial direction outer side surface of the pad guide 3 to the shaft of the disk 1. A first extending portion 40 extending in the direction, a connecting plate portion 43 extending inward in the radial direction of the disk 1 at the front end side of the first extending portion 40, and a disk folded by the front end side of the connecting plate portion 43. 1 and a curl portion 21 extending in the rotational direction of the disc 1 and a friction pad 8 extending obliquely with respect to the axial direction of the disc 1 outwardly in the radial direction of the disc 1 in a direction approaching the disc 1 from the tip of the curl portion 21 A second extending portion 22 in contact therewith. For this reason, the contact of the second extending portion 22 with the lower surface plate portion 38 can be suppressed, and a stable spring load can be secured when the friction pad 8 is urged in the radial direction of the disk 1.

  In the above-described embodiment, the second extending portion 22 includes the two bent portions of the first bent portion 22A1 and the second bent portion 22B1, so that the second extended portion 22 is replaced with the curled portion 21. The case where the angle with respect to the axial direction of the disk 1 is increased between the tip 21B1 and the guide plate portion 15 has been described as an example. However, the present invention is not limited to this, and for example, three or more bent portions are provided in the second extending portion, and the angle of the second extending portion with respect to the axial direction of the disk increases from the tip of the curled portion to the guide plate portion. You may do it.

  In the above-described embodiment, the case where the two pistons 4D and 4D arranged in the rotation direction of the disc 1 are provided on the inner leg portion 4A of the caliper 4 has been described as an example. However, the present invention is not limited to this. For example, one piston or three or more pistons may be provided on the inner leg of the caliper, and the friction pad may be pressed against the disk by the piston.

1 disk 2 mounting member 3 pad guide 3A upper wall surface (disk radial outer side surface)
3B Lower wall surface (inner side surface in the disk radial direction)
3C Back side wall (bottom)
4 Caliper 8 Friction pad 9 Back plate 9A, 9B Protruding part 11 Pad spring 15 Guide plate part 17 Opposing plate part (opposing surface part)
19 radial direction urging portion 20 first extending portion 21 curl portion 22 second extending portion 22A1 first bent portion 22B1 second bent portion 36 upper surface plate portion (outer side surface plate portion)
38 Lower surface plate portion 39 Radial direction biasing portion 40 First extending portion 43 Connecting plate portion

Claims (2)

An attachment member attached to a non-rotating part of the vehicle and having a concave pad guide;
A caliper provided slidably on the mounting member;
A pair of friction pads having protrusions inserted into the pad guides of the mounting member and pressed against both sides of the disc by the calipers;
A pad spring that is attached to the attachment member and elastically supports the friction pads;
In a disc brake comprising
The pad spring is attached so as to be able to abut on the radially outer side surface and the bottom of the pad guide of the mounting member and guides the friction pad in the axial direction of the disk;
A radial biasing portion that extends from the guide plate portion and biases the friction pad in the radial direction of the disk;
The radial biasing portion is
A first extending portion extending in the axial direction of the disc from the facing surface portion of the guide plate portion facing the bottom portion of the pad guide;
A curl portion that extends inward in the radial direction of the disk and extends in the rotational direction of the disk at the distal end side of the first extension section;
The curl portion is formed to extend outward in the radial direction of the disc in a direction approaching the disc from the front end of the curl portion and obliquely with respect to the axial direction of the disc, with one surface abutting the friction pad and the other surface side of the pad guide. A disc brake comprising a disc radial inner side surface and a second extending portion disposed to face each other without the guide plate portion interposed therebetween. An attachment member attached to a non-rotating part of the vehicle and having a concave pad guide;
A caliper provided slidably on the mounting member;
A pair of friction pads having protrusions inserted into the pad guides of the mounting member and pressed against both sides of the disc by the calipers;
A pad spring that is attached to the attachment member and elastically supports the friction pads;
In a disc brake comprising
The pad spring is formed in a U-shape and is fitted and attached to a pad guide of the mounting member to guide the friction pad in the axial direction of the disk, and extends from the guide plate. A radial urging portion that urges the friction pad in the radial direction of the disk,
The radial biasing portion is
A first extending portion extending in the axial direction of the disk from the outer side surface plate portion of the guide plate portion facing the disk radial direction outer side surface of the pad guide;
A connecting plate portion extending inward in the radial direction of the disk on the tip side of the first extending portion;
A curled portion that is folded back at the leading end side of the connecting plate portion and extends in the rotation direction of the disc;
A second extension part extending obliquely with respect to the axial direction of the disk and in contact with the friction pad, radially outward of the disk in a direction approaching the disk from the tip of the curl part;
A disc brake characterized by comprising:

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