JP2011012729A - Disc brake - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a disc brake which prevents misalignment and backlash of pad springs, when the outside diameter of a disc rotor is increased.SOLUTION: A pair of pad guides 11, 12 are provided on both the outer sides of a carrier 3 in a disc rotor rotating direction, and a pair of pad guides 13, 14 are provided on both the inner sides of the carrier 3 in the disc rotor rotating direction. The corresponding pad springs 15, 16 are singly attached to the pad guides 11, 12, 13, 14, and both sides of the corresponding pad guides 11, 12, 13, 14 in a disc rotor shaft direction are sandwiched between a pair of locking portions 32, 33 extending from both sides of the torque receiving portions of the pad springs 15, 16 in the disc rotor rotating direction. Thereby, the misalignment and backlash of the pad springs 15, 16 are overcome.

Description

  The present invention relates to a disc brake for braking a vehicle or the like.

  For example, in the case of a disk brake, it is effective to increase the heat capacity by setting the outer diameter of the disk rotor to be large in order to improve the brake performance. Therefore, as described in Patent Document 1, in order to increase the outer diameter of the disk rotor, the thickness of the portion (hereinafter referred to as the straddle) of the carrier (mounting member) straddling the disk rotor (disc rotor) Attempts have been made to minimize the radial dimension). In the disc brake described in Patent Document 1, pad springs formed by connecting an inner side pad guide and an outer side pad guide at a connecting portion are provided on both sides of a carrier (mounting member) in the disc rotor rotation direction. ing. .

JP 2008-138752 A

  In the above-described disc brake of Patent Document 1, if the width of the connecting portion of the pad spring (the dimension in the radial direction of the disc rotor) is set small, there is a possibility that the pad spring will have insufficient rigidity and the pad spring may be rattled. is there. An object of the present invention is to provide a disc brake that prevents rattling of the pad spring when the outer diameter of the disc rotor is set large.

  In order to solve the above-mentioned problems, the disc brake of the present invention has a pad guide provided with a pair of mounting members provided on both sides of the disc rotor in the rotational direction and provided on both sides of the disc rotor in the axial direction with the disc rotor interposed therebetween. Has a concave part in which a convex part of the friction pad is fitted and a torque support part is formed on the bottom part to support the braking torque from the friction pad via a pad spring. A pad rotor facing surface of the pad guide and the disk rotor facing each other from both sides in the disk rotor axial direction at corresponding positions of the fitting portion fitted to the pad guide and the torque support portion in the fitting portion. A pair of locking portions that contact the opposite side surface and extend outward of the mounting member in the direction of rotation of the disc rotor. The features.

  ADVANTAGE OF THE INVENTION According to this invention, the disc brake which prevented the rattle of the pad spring can be provided.

It is a top view of the disc brake of this embodiment. It is a front view of the disc brake of this embodiment. It is a top view in the state where the carrier of the disc brake of this embodiment was removed. It is a top view of the carrier simple substance of the disc brake of this embodiment. It is a perspective view of the pad spring used for the disc brake of this embodiment. FIG. 6 is a plan view of the pad spring shown in FIG. 5. FIG. 6 is a front view of the pad spring shown in FIG. 5. It is explanatory drawing of this embodiment, and is a figure which shows the initial stage of the process of attaching a pad spring to a pad guide. It is a figure which shows the state which moved the pad spring from the state shown by FIG. 8, and the latching claw of the pad spring contacted the protrusion part (inclined surface) of the pad guide side part. FIG. 10 is a diagram illustrating a state in which the pad spring is further moved from the state illustrated in FIG. 9 to complete the attachment of the pad spring to the pad guide.

An embodiment of the present invention will be described with reference to the accompanying drawings.
A disc brake 1 shown in FIGS. 1 and 2 is a disc brake 1 attached to a vehicle, and extends in a rotation direction of a disc rotor 2 (left and right direction in FIGS. 1 and 2; hereinafter referred to as a disc rotation direction). A carrier 3 (attachment member) provided so as to straddle the disc rotor 2 in the axial direction of the disc rotor 2 (vertical direction in FIG. 1; hereinafter referred to as the disc axial direction), and each of the disc rotors 2 attached to the carrier 3 A pair of friction pads 4, 5 disposed opposite to the friction surfaces 2 a, 2 b and a disc rotor 2 through the disc path portion, and a claw portion 6 is provided on the outer side (lower side in FIG. 1) of the vehicle. And a caliper 7 that is formed and has a cylinder part composed of a cylinder bore and a piston on the inner side (the upper side in FIG. 1) of the vehicle.

  The caliper 7 has a pair of slide pins 8 and 9 that extend in the disk axial direction and are spaced apart in the disk rotation direction. The slide pins 8 and 9 are slidably supported by the carrier 3. As a result, the caliper 7 is movable in the disk axial direction while the pair of slide pins 8 and 9 are guided. On the outer periphery of each slide pin 8, 9 between the mounting portion of each slide pin 8, 9 of the caliper 7 and the carrier 3, a boot 10 for protecting the outer surface of each slide pin 8, 9 is provided. Yes. The respective pad guides 11, 12, 13, 14 (corresponding to the carrier 3) are provided at both ends of the friction pads 4 and 5 in the disk rotation direction (the left and right ends in FIG. 2) via pad springs 15 and 16, which will be described later. Convex portions 17 and 18 that are engaged with the respective concave portions 21, 22, 23, and 24 of FIG. 4 are provided. The friction pads 4 and 5 are arranged so that the convex portions 17 and 18 are guided by the corresponding concave portions 21, 22, 23 and 24 and are movable in the disk axis direction.

  When the outer friction pad 4 is braked, the rotational force of the disk rotor 2 is such that when the disk rotor 2 is rotating forward (rotating in the direction A shown in FIG. 2), the friction pads 4 and 5 of FIG. 2 is supported by torque support portions 21a and 23a formed on the bottoms of the recesses 21 and 23 of the left pad guides 11 and 13 of FIG. When the disk rotor 2 is rotating in the reverse direction (reversely rotating in the direction A shown in FIG. 2), the right protrusion 18 in FIG. 2 of each friction pad 4, 5 is on the right side in FIG. The pad guides 12 and 14 are supported by torque support portions 22a and 24a formed at the bottoms of the recesses 22 and 24 of the pad guides 12 and 14, respectively.

  The carrier 3 (mounting member) is formed of, for example, ductile cast iron, and as shown in FIG. 4, a pair of disks 3 are provided on both sides of the disk rotation direction so as to straddle the disk rotor 2 in the disk axial direction (vertical direction in FIG. 4). It is formed in a frame shape including straddling portions 19 and 20 and a pair of side plates 25 and 26 that extend in the disc rotation direction and connect the pair of straddling portions 19 and 20. The pair of pad guides 11 and 12 described above are provided at both ends of the side plate 25, and the opposing surfaces of the pair of pad guides 11 and 12 (surfaces directed toward the center of the disk 3 in the disk rotation direction) are respectively provided. Concave portions 21 and 22 are provided which are formed in a substantially U-shape and have bottom portions serving as torque support portions 21a and 22a. A protrusion 27 is provided on the outer side surface of the pair of pad guides 11 and 12 (the lower surface in FIG. 4 and the side opposite to the disk rotor facing surfaces 11a and 12a). By this protruding portion 27, an inclined portion 28 is formed on the outer side of the pair of pad guides 11, 12, and is inclined outward in the disk axial direction (outer side) with respect to the disk rotor facing surfaces 11 a, 12 a of the pad guides 11, 12. Then, a top portion 29 is formed continuously to the inclined portion 28 and parallel to the disk rotor facing surfaces 11a, 12a of the pad guides 11, 12.

  Further, the pair of pad guides 13 and 14 described above are provided at both ends of the side plate 26, and the opposing surfaces of the pair of pad guides 13 and 14 (surfaces facing the center of the carrier 3 in the disk rotation direction) are provided. The recesses 23 and 24 are formed so as to be substantially U-shaped, with the bottoms serving as torque support portions 23a and 24a, respectively. Projections 27 are provided on the inner side surfaces of the pair of pad guides 13 and 14 (the upper surface in FIG. 4 and the side surface opposite to the disk rotor facing surfaces 13a and 14a). By this protrusion 27, an inclined portion 28 that is inclined outward (inner side) in the disk axial direction with respect to the disk rotor facing surfaces 13 a, 14 a of the pad guides 13, 14 on the inner side of the pair of pad guides 13, 14. Then, a top portion 29 is formed continuously to the inclined portion 28 and parallel to the disk rotor facing surfaces 13a, 14a of the pad guides 13, 14.

  The pad spring 16 is made of spring steel and is attached to the pad guides 12 and 13. As shown in FIGS. 5 to 7, the pad spring 16 has a torque receiving portion 31 (fitting portion) that contacts the torque support portions 22 a and 23 a (bottom portion) of the recesses 22 and 23 of the pad guides 12 and 13. A pair of locking portions 32 and 33 extending from both ends of the torque receiving portion 31 in the axial direction of the disc toward the outer side in the disc rotating direction (upward in FIG. 6), and inward in the disc rotating direction from the upper end of the torque receiving portion 31 Of the outer side friction pad 4 connected to the lower end of the torque receiving portion 31 and the fitting piece 34 (fitting portion) that contacts the upper surface of the concave portions 22 and 23 formed in a substantially U shape. And a pad urging portion 35 for urging the convex portion 17 and the convex portion 18 of the inner pad 5 outward in the radial direction of the disk rotor 2 (upward in FIG. 2).

  Of the pair of locking portions 32 and 33, the fixing claws 32 that are in contact with the disk rotor facing surfaces 12a and 13a of the pad guides 12 and 13 slightly toward the side away from the disk rotor 2 toward the tip. The tip is inclined inward, and its tip is bent toward the disk rotor 2 side (left side in FIG. 6) in order to facilitate attachment of the pad spring 16. On the other hand, the locking claw 33 that is in contact with the side surface of the pad guides 12, 13 opposite to the disk rotor facing surfaces 12 a, 13 a is formed in a substantially S shape in a plan view and A first piece 33a extending in a direction away from the rotor 2 (the right direction in FIG. 6) and the first piece 33a through the first curved portion 33b, and inward toward the disc rotor 2 toward the tip. The second piece 33c is inclined at a predetermined angle, and the second bending portion 33d is provided at the tip of the second piece 33c and is bent to the opposite side with respect to the first bending portion 33b. The second piece 33c is formed so that the length is substantially equal to the fixed claw 32 and the width (the vertical dimension in FIG. 5) is small.

  The pad urging portion 35 is formed in a tongue shape, and corresponds to the base piece 35a extending from the disk radial direction inner end of the torque receiving portion 31 inward in the disk rotation direction (downward in FIG. 6), and the friction pads 4 and 5. Abutting piece 35b abutting against the lower end surfaces of the projecting portions 18 and 17, and one end connected to the end of the base piece 35a opposite to the disk rotor 2 side and the other end abutting piece 35b. And a spring piece 35c that is formed in a substantially C-shape connected to the end opposite to the disk rotor 2 side and generates a biasing force by being compressed in the circumferential direction. As shown in FIGS. 5 and 7, the pad spring 16 has a cut-and-raised portion 36 between the torque receiving portion 31 and the base piece 35 a of the pad urging portion 35. The pad springs 16 are held so as not to move in the disk rotation direction by contacting the corresponding pad guides 12 and 13 with the lower surfaces of the recesses 22 and 23 formed in a substantially U shape. .

On the other hand, the pad spring 15 is attached to the pad guides 11 and 14 positioned diagonally, and is formed in mirror symmetry with respect to the pad spring 16. The same names and symbols as those of the pad spring 16 are given, and detailed description of the pad spring 15 is omitted.
In the present embodiment, the protrusions 17 and 18 of the outer friction pad 4 are urged outward in the disk radial direction (upward in FIG. 2) by the pad urging portions 35 and 35 of the pad springs 15 and 16, respectively. Deviation and backlash with respect to the carrier 3 are prevented. Further, the protrusions 17 and 18 of the inner pad 5 are urged outward in the radial direction of the disk (upward in FIG. 2) by the pad urging portions 35 and 35 of the pad springs 16 and 15, respectively. Is prevented.

  As shown in FIG. 2, each of the friction pads 4 and 5 is provided with a pad return spring 37 (return spring) on the surface of the convex portion 18 opposite to the disk rotor 2 side (pad lining side). The pad return spring 37 is formed in a substantially V shape in which one fixed portion 37a is fixed to the convex portion 18 of the corresponding friction pad 4 and 5, and the other end is bent outward via an R portion 37b. As shown in FIG. 3, in a state where the friction pads 4 and 5 are assembled to the carrier 3, each pad return spring 37 has a pad spring 16 in which the R portion 37 b is attached to the pad guides 12 and 14, respectively. 15, 15, specifically the second curved portion 33 d. The radius of curvature of the R portion 37b of the pad return spring 37 is set to be smaller than the radius of curvature of the second curved portion 33d of the locking claw 33 of each pad spring 15 and 16. In the present embodiment, the pad return spring 37 is provided only on the turn-in side with respect to the disk rotation direction in the direction A in FIG. 37 may be provided.

  In the present embodiment, the pad spring 15 is attached to the pad guides 11 and 14 located on the diagonal of the carrier 3 (attachment member), and the pad spring 16 is attached to the pad guides 12 and 13 located on the other diagonal. It is done. Here, the procedure for attaching the pad spring 15 to the pad guide 14 will be described. The procedure for attaching the pad spring 15 to the pad guide 11 and the procedure for attaching the pad spring 16 to the pad guides 12 and 13, respectively, Since the procedure is the same as that for attaching to the pad guide 14, the description thereof is omitted.

  First, as shown in FIG. 8, the torque receiving portion 31 (fitting portion) of the pad spring 15 is opposed to the torque support portion 24 a (bottom portion) of the concave portion 24 of the pad guide 14, and the disk guide facing surface of the pad guide 14. The pad spring 15 is moved outward in the disk rotation direction (right direction in FIG. 8) with respect to the pad guide 14 while guiding the inside of the fixing claw 32 (locking portion) of the pad spring 15 by 14a. Then, as shown in FIG. 9, the second curved portion 33 d of the locking claw 33 (locking portion) comes into contact with the inclined portion 28 of the pad guide 14 during the movement of the pad spring 15. Then, while continuing to guide the second bending portion 33d by the inclined portion 28 and elastically deforming the first bending portion 33b of the locking claw 33, the pad spring 15 is further pushed into the pad guide 14, and the torque of the pad spring 15 is increased. By attaching the receiving portion 31 to the torque support portion 24a of the concave portion 24 of the pad guide 14, the attachment of the pad spring 15 to the pad guide 14 is completed as shown in FIG.

  After the pad springs 15 and 16 corresponding to the pad guides 11, 12, 13, and 14 are sequentially attached in the above-described procedure, the pad guides 11 and 12 are formed at the convex portions 17 and 18 of the outer friction pad 4. Each of the pad springs 15 and 16 attached to the pad springs 15 and 16 is pressed down so that the contact pieces 35b of the pad urging portions 35 are pushed down. , 16 so as to be movable in the disk axial direction. As a result, the outer friction pad 4 is attached to the carrier 3, and the R portion 37 b of the pad return spring 37 (return spring) attached to the convex portion 18 of the outer friction pad 4 is attached to the pad guide 12. It is received by the locking claw 33 of the pad spring 16 that contacts the top 29 of the protrusion 27 provided, specifically, the second curved portion 33d.

  Similarly, the protrusions 17 and 18 of the inner pad 5 push down the contact pieces 35b of the pad urging portions 35 of the pad springs 16 and 15 attached to the pad guides 13 and 14, respectively. 17 and 18 are fitted to the recesses 23 and 24 of the pad guides 13 and 14 via the pad springs 16 and 15 so as to be movable in the disk axial direction. Accordingly, the inner pad 5 is attached to the carrier 3, and the R portion 37 b of the pad return spring 37 attached to the convex portion 18 of the inner pad 5 is formed on the top portion 29 of the protruding portion 27 provided on the pad guide 14. It receives by the 2nd curved part 33d of the latching claw 33 of the pad spring 15 to contact | abut.

  Therefore, after the brake is released, the caliper 7 is moved outwardly in the disk axial direction (outer side) with respect to the carrier 3 by the pad return spring 37 attached to the outer friction pad 4 so that the outer friction pad 4 is moved. The disc rotor 2 can be separated from the disc rotor 2, and the disc brake 1 can be prevented from being dragged. Further, due to the pad return spring 37 attached to the inner pad 5, the return amount of the caliper 7 by the pad return spring 37 attached to the outer friction pad 4 is too large, and the inner pad 5 contacts the disc rotor 2. Can be prevented.

This embodiment has the following effects.
According to this embodiment, a pair of pad guides 11 and 12 are provided on both sides of the outer side of the carrier 3 (mounting member) in the disk rotation direction, and a pair of pad guides 13 and 14 are provided on both sides of the carrier 3 in the disk rotation direction. And pad springs 15 and 16 corresponding to the respective pad guides 11, 12, 13, and 14 are individually attached. For this reason, in the above-described prior art, there is a possibility that the pad springs 15 and 16 are displaced and rattled due to insufficient rigidity of the pad springs 15 and 16. Since the corresponding pad guides 11, 12, 13, 14 are sandwiched on both sides in the disk axial direction by the pair of locking portions 32, 33 extending from both sides of the torque receiving portion 31 in the disk rotation direction, the displacement of the pad springs 15, 16 The backlash can be eliminated. Then, the fixing claws 32 and the locking claws 33 constituting the pair of locking portions 32 and 33 are formed to have equal lengths extending outward in the disk rotation direction, and the width in the disk radial direction is changed (the locking claws 33). By adjusting the spring force of the fixed claw 32 and the spring force of the locking claw 33 relative to each other, the pad springs 15 and 16 can be made difficult to shift in the disk axial direction.

  Further, even if the thickness of the straddling portions 19 and 20 of the carrier 3 in the disc radial direction decreases as the outer diameter of the disc rotor 2 increases, the pad springs 11 and 13 are straddled across the disc rotor 2. In addition, unlike the conventional disk rotor 1 in which the pad springs 12 and 14 are connected to each other (see, for example, Patent Document 1), the accuracy required for the pad springs 15 and 16 is increased and the manufacturing cost does not increase. .

  Furthermore, the protrusion 27 is provided in the side surface on the opposite side with respect to the disk rotor opposing surface 11a, 12a, 13a, 14a of each pad guide 11,12,13,14. For this reason, when the pad springs 15 and 16 are mounted, the second curved portion 33d of the locking claw 33 is guided toward the top portion 29 by the inclined portion 28 formed in each protruding portion 27. , 16 can be attached to the pad guides 11, 12, 13, and 14.

  Then, after releasing the brake, the caliper 7 is moved outwardly in the disk axial direction (outer side) with respect to the carrier 3 by the pad return spring (return spring) 37 attached to the outer friction pad 4 so that the outer side The friction pad 4 can be separated from the disc rotor 2, and dragging of the disc brake 1 can be suppressed. Further, due to the pad return spring 37 attached to the inner pad 5, the return amount of the caliper 7 by the pad return spring 37 attached to the outer friction pad 4 is too large, and the inner pad 5 contacts the disc rotor 2. Can be prevented. Further, since the R portion 37b of each pad return spring 37 is brought into contact with the second curved portion 33d of the locking claw 33 of each corresponding pad spring 15, 16, each pad return is placed on the carrier 3 (attachment member) side. There is no need to provide a new spring 37 support.

  Further, since the tip of the pad return spring (return spring) 37 comes into contact with the locking claw 33 of the pad springs 16 and 15, specifically, the second curved portion 33d, the locking claw 33 is It has two functions of locking the pad spring 16 and receiving the pad return spring 37. For this reason, as disclosed in Japanese Patent Application Laid-Open No. 2009-41769, it is not necessary to separately form a contact plate portion (receiving portion) for the return spring in the pad spring, and the pad spring can be easily manufactured. can do.

1 Disc brake, 2 Disc rotor, 3 Carrier (mounting member), 4, 5 Friction pad, 7 Caliper, 11, 12, 13, 14 Pad guide, 11a, 12a, 13a, 14a Disc rotor facing surface, 15, 16 Pad Spring, 17, 18 Convex part, 21, 22, 23, 24 Concave part, 21a, 22a, 23a, 24a Torque support part, 27 Protruding part, 32 Fixed claw (engaging part), 33 Locking claw (engaging part) 37 Pad return spring (return spring)

Claims (3)

A mounting member that extends in the disk rotor rotation direction and straddles the disk rotor in the disk rotor axial direction on both sides of the disk rotor rotation direction, and has projections on both sides of the disk rotor rotation direction and slides on the mounting member in the disk rotor axial direction At least a pair of friction pads that can be mounted, a caliper that is provided on the mounting member and that is pressed against both surfaces of the disk rotor by movement of the mounting member in the axial direction of the disk rotor, and the mounting member A disc brake provided with a pad spring provided between the friction pad and biasing the friction pad outward in the radial direction of the disc rotor;
The mounting member has a pair of pad guides provided on both sides of the disk rotor rotation direction and provided on both sides of the disk rotor axial direction across the disk rotor,
The pad guide has a concave portion in which a convex portion of the friction pad is fitted and a torque support portion is formed on the bottom portion to support the braking torque from the friction pad via the pad spring.
The pad springs are individually provided in the respective pad guides, and both sides in the disc rotor axial direction of the corresponding positions of the fitting portion fitted to the pad guide and the torque support portion in the fitting portion. Each having a pair of locking portions that contact the disk rotor facing surface of the pad guide and the side surface opposite to the disk rotor facing surface and extend outward of the mounting member in the disk rotor rotation direction. Disc brake characterized by that. On the side surface opposite to the disk rotor facing surface of each pad guide, a protrusion that extends outward of the mounting member in the disk rotor rotation direction and protrudes outward of the mounting member in the disk rotor axial direction Is provided,
Of the pair of locking portions of each pad spring, the locking claw that abuts the side surface opposite to the disk rotor facing surface of the mounting member is provided on each pad guide to which the fitting portion of each pad spring corresponds. 2. The disc brake according to claim 1, wherein the disc brake comes into contact with the protruding portion of each pad guide while being fitted into the concave portion.   One end of the return spring is fixed to the friction pad, and the other end abuts on the mounting member side to bias the friction pad away from the disk rotor. 3. The disc brake according to claim 1, wherein the disc brake abuts on the locking claw that abuts on a side surface opposite to the disc rotor facing surface of the mounting member.

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