JP3964180B2 - Disc brake - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a disc brake capable of preventing occurrence of abnormal noise.
[0002]
[Prior art]
Examples of conventional disc brakes include those disclosed in JP-A-8-226470, JP-A-8-74898, JP-A-2000-74107, and the like. The disc brakes disclosed in these publications have support recesses that face each other, the support recesses are spaced apart in the circumferential direction of the disc, and bending recesses that are inserted into the support recesses. A pair of pad guides that are held by the carrier in a state where the lining is fixed, and a lining is fixed to a back metal having projections formed on both sides, and the discs are guided by the pad guides by inserting the projections into the bent recesses. It has a pair of pads that slide in the axial direction and a caliper that presses both pads in the disk direction from both outsides.
[0003]
[Problems to be solved by the invention]
By the way, in the disc brake having the above-described configuration, the outer surface portion in the disk radial direction of the bent recess of the pad guide may rub against the outer surface portion in the disk radial direction of the support recess of the carrier during braking. Then, an abnormal noise was sometimes generated.
[0004]
The present invention is attributed to this rubbing by preventing the outer surface portion in the disk radial direction of the bent recess of the pad guide and the outer surface portion of the carrier supporting recess in the disk radial direction from contacting and rubbing during braking. An object of the present invention is to provide a disc brake that can prevent abnormal noises caused by noise.
[0005]
[Means for Solving the Problems]
In order to achieve the above object, the disc brake according to claim 1 of the present invention is configured such that the carrier and the pad are unevenly fitted in the circumferential direction of the disc, and the pad is braked on the inner side in the radial direction of the disc from the unevenly fitting portion. In a disc brake provided with a pad guide for transmitting torque to the carrier and urging the pad outward in the radial direction of the disc between the carrier and the pad, the opposing portion of the uneven fitting portion between the carrier and the pad Among these, a clearance is always maintained between the facing portion of the carrier and the pad guide at a position facing the direction in which the pad is urged.
[0006]
As described above, the clearance is always maintained between the facing portion of the carrier and the pad guide at the position facing the direction in which the pad is urged , in the facing portion of the concave and convex fitting portion between the carrier and the pad. Even during braking, the carrier surface and the pad guide can be prevented from contacting and rubbing.
[0007]
According to a second aspect of the present invention, there is provided the disc brake according to the second aspect of the present invention, wherein the support recesses are opposed to each other and the support recesses are spaced apart from each other in the circumferential direction of the disc. A pair of pad guides held by the carrier in a state of being inserted into the recesses, and a lining fixed to a back metal having projections formed on both sides, and the projections being inserted into the bending recesses A pad that is guided by the pad guide and slides in the disk axial direction, transmits a braking torque to the carrier on the inner surface in the disk radial direction than the protrusion, and is urged outward in the disk radial direction by the pad guide. And a caliper that presses the pad in the direction of the disk, wherein the pad guide is biased toward the pad It is characterized in that the clearance holding portion which always holds a clearance between the support recess of the carrier and the bending recess protrudes from the bent concave portion in the same direction.
[0008]
Thus, the pad guide and the clearance holding portions which always holds a clearance is provided between the collision out by bending recesses and support recesses of the carrier than the flexure recesses in the same direction as the direction for urging the pad Therefore, even during braking, it is possible to prevent the surface portion in the same direction as the pad biasing direction of the bent recess of the pad guide and the surface portion of the carrier supporting recess facing the pad biasing direction from rubbing against each other. .
[0009]
The disc brake according to a third aspect of the present invention is the disc brake according to the second aspect, wherein the clearance holding portion is cut and raised from an intermediate portion of the bent concave portion so as to face the direction in which the pad is urged. The carrier is in contact with the surface of the support recess of the carrier .
[0010]
Thus, since the clearance holding part is cut and raised from the middle part of the bent concave part, the clearance holding part can be integrally formed with the pad guide by press molding.
[0011]
DETAILED DESCRIPTION OF THE INVENTION
A disc brake according to an embodiment of the present invention will be described below with reference to the drawings. In the following description, the vehicle is described in a state where it is arranged at a regular position where the vehicle can be braked.
[0012]
As shown in FIG. 1, the disc brake 10 of the present embodiment is fixed in position in both the axial direction of the disc 11 (the direction orthogonal to the plane of FIG. 1) and the radial direction (vertical direction in FIG. 1). A carrier 12 attached to the non-rotating part, a pair of pad guides 13 disposed on the carrier 12 at intervals in the circumferential direction of the disc (left and right direction in FIG. 1), and the disc 11 on both sides of the disc 11 A pair of pads 14 (only one is shown) that are slidably supported by the carrier 12 through a pair of pad guides 13 in a state of being disposed in a state of being arranged, and two sliding guide portions 16 of the carrier 12 are not shown. The caliper 17 is supported by a slide pin so as to be slidable in the disk axial direction and presses the pad 14 from both outer sides in the disk direction. Made a, is a so-called pin slide type.
[0013]
Both of the pads 14 have a lining (not shown) that contacts the disk 11 to generate a frictional force, and a back metal 20 that holds the lining in a fixed state. The linings face the disk 11 with the linings facing each other. It is arranged on both sides.
[0014]
The back metal 20 has a mirror surface target shape having convex portions 23 protruding on both sides in the disk circumferential direction. As shown in FIG. 2, the convex portion 23 is a surface portion 24 that is arranged on the outer side (upper side in FIG. 2) in the disc radial direction (up and down direction in FIG. 2) along the disc axial direction (direction perpendicular to the paper surface in FIG. 2). And a surface portion 25 that is disposed along the disk axial direction and on the inner side (lower side in FIG. 2) in the disk radial direction, and an end surface portion 26 that is disposed along the disk axial direction and at the end in the disk circumferential direction. Have. The end surface portion 26 is orthogonal to the surface portion 24 and the surface portion 25 that are parallel to each other.
[0015]
As shown in FIG. 1, the carrier 12 is arranged so as to be positioned at both ends in the circumferential direction of the disc and supports the caliper 17 described above. Inwardly extending in the radial direction of the disk on one side of the disk 11 in the direction, a connecting part 30 for connecting these inwardly extending parts 29 on the extended tip side, and sliding An inward extending portion 31 that extends inward in the radial direction of the disc on the opposite side of the disc 11 in the disc axial direction from the guide portion 16, and an outer beam 32 that connects the inwardly extending portions 31 to each other. have. That is, the disk 11 is disposed between the inwardly extending part 29 and the inwardly extending part 31, and the sliding guide part 16 passes over the radially outward side of the disk 11 between these inwardly extending parts 29, 31. Connect them together.
[0016]
Further, at the inner positions of the inwardly extending portions 29 and 31, support concave portions 33 that are recessed by one step in the disc circumferential direction are formed so as to extend in the disc axial direction, and these support concave portions 33 are mutually connected. Opposing and spaced apart in the disk circumferential direction.
[0017]
As shown in FIG. 2, the support recess 33 is formed along the disk axial direction along the disk axial direction and along the disk circumferential direction (left-right direction in FIG. 2) and on the outer side in the disk radial direction. A surface portion 35 is disposed along the circumferential direction of the disk and on the inner side in the radial direction of the disk, and a bottom surface portion 36 is disposed between the surface portions 34 and 35 along the disk axial direction. The bottom surface portion 36 is orthogonal to the surface portions 34 and 35 that are parallel to each other.
[0018]
The pad guide 13 guides the sliding of the pad 14 in the disk axis direction, and has a mirror-symmetric shape as shown in FIG. The pad guide 13 extends along the disk axial direction (left and right direction in FIG. 3A) and along the disk radial direction (up and down direction in FIG. 3A), and at the center in the disk radial direction (in the disk axial direction) ( A guide plate portion 38 formed with a passage recess 37 for allowing the disc 11 to pass therethrough on the lower side in FIG. 3A, and the disc circumferential direction (FIG. 3) from the bottom side of the passage recess 37 of the guide plate portion 38. The locking plate portion 39 projecting to one side (left and right direction in (b)) and the end of the guide plate portion 38 on the inner side in the disc radial direction extend from the locking plate portion 39 in the disc circumferential direction to the opposite side. And an urging plate portion 40.
[0019]
A bent concave portion 41 is formed at an intermediate position in the disc radial direction of the guide plate portion 38 of the pad guide 13 so as to be recessed by one step on the same side as the locking plate portion 39 in the disc circumferential direction. The bent concave portion 41 is a plate portion that is perpendicular to the guide plate portion 38 and extends to the same side as the locking plate portion 39 (that is, opposite to the pad 14) along the disc axial direction and the disc circumferential direction. 42, a plate portion 43 extending in parallel to the plate portion 42 from the inner side in the disk radial direction than the plate portion 42, and a bottom plate portion 44 provided between the plate portions 42 and 43 along the disk axial direction. Have. The bottom plate portion 44 is orthogonal to the plate portion 42 and the plate portion 43.
[0020]
Here, as shown in FIG. 2, the pad guide 13 is inserted into the support recess 33 of the carrier 12 at the bent recess 41. In this state, although not shown, the locking plate portion 39 is fitted between the inwardly extending portions 29 and 31 of the carrier 12. The outer width of the bent recess 41 in the disk radial direction is smaller than the width of the support recess 33 in the disk radial direction. Further, as shown in FIG. 3B, the inner width of the bent concave portion 41 in the disk radial direction is such that the width H2 on the bottom plate portion 44 side is the width H1 on the opposite side (opening portion side) with respect to the bottom plate portion 44. Is slightly wider (H1 <H2).
[0021]
As shown in FIG. 2, the pad guide 13 protrudes outward in the disk radial direction from the bent recess 41 and has a clearance between the plate portion 42 of the bent recess 41 and the surface portion 34 of the support recess 33 of the carrier 12. A clearance holding plate portion (clearance holding portion) 46 that always holds the pressure is formed. As shown in FIG. 3, the clearance holding plate portion 46 is slightly cut and raised from the intermediate portion in the disc axial direction of the bent concave portion 41 to the outer side in the disc circumferential direction, and from the bottom plate portion 44 of the bent concave portion 41. A first plate portion 47 extending outward in the radial direction of the disc while slightly tilting outward in the disc circumferential direction, and outward in the radial direction of the disc while tilting inward in the circumferential direction of the disc from the tip of the first plate portion 47 It has the 2nd board part 48 extended. Here, the distal end portion of the second plate portion 48 protrudes outward in the disk radial direction from the plate portion 42 of the bent recess 41.
[0022]
As shown in FIG. 2, the pad guide 13 is inserted into the support recess 33 of the carrier 12 at the bent recess 41, and the locking plate portion 39 is fitted between the inwardly extending portions 29 and 31 of the carrier 12. By being combined, the carrier 12 is attached. Pad guides 13 are attached to both sides of the carrier 12 in the disk circumferential direction.
[0023]
With the pad guide 13 attached to the carrier 12 in this way, the clearance holding plate portion 46 abuts against the surface portion 34 of the support recess 33 and slightly bends to generate an urging force, thereby causing the bent recess 41 to move to the disc. The urging is performed in a direction away from the surface portion 34 in the radial direction. As a result, the bent concave portion 41 separates the plate portion 42 from the surface portion 34 of the support concave portion 33 and brings the plate portion 43 into contact with the surface portion 35 of the support concave portion 33. The clearance holding plate portion 46 keeps the clearance C between them by separating the plate portion 42 of the bent concave portion 41 from the surface portion 34 of the support concave portion 33 at all times including the time when braking is introduced. The urging force is set in
[0024]
Further, in a state where the pad guide 13 is inserted into the support recess 33 of the carrier 12 in the bending recess 41, the bottom plate portion 44 of the bending recess 41 is separated from the bottom surface portion 36 of the support recess 33. The clearance is always kept in between.
[0025]
The pad guide 13 is press-molded from a plate member, and is integrally molded as a whole including the clearance holding plate portion 46.
[0026]
And the convex part 23 of both sides is inserted in the bending recessed part 41 of a pair of pad guide 13 attached to the disk circumferential direction both sides of the carrier 12 in this way, and the pad 14 is supported by these pad guides 13. . At this time, the pad 14 is urged outward in the radial direction of the disk by the urging plate portion 40 of the pad guide 13. The pads 14 are supported by pad guides 13 on both sides in the disk circumferential direction so that a pair of pads 14 are arranged on both sides in the axial direction of the disk 11.
[0027]
Here, the width of the convex portion 23 of the pad 14 in the disc radial direction is made smaller than the inner width of the bent concave portion 41 in the disc radial direction, and as a result, the convex portion 23 of the pad 14 supported by the pad guide 13. The surface portion 24 abuts on the plate portion 42 of the bent concave portion 41, and the surface portion 25 is separated from the plate portion 43 of the bent concave portion 41. That is, the convex portion 23 of the pad 14 holds a clearance radially inward with respect to the bent concave portion 41. Further, the end surface portion 26 of the convex portion 23 of the pad 14 is separated from the bottom plate portion 44 of the bent concave portion 41, and maintains a clearance with the bottom plate portion 44.
[0028]
As shown in FIG. 1, the caliper 17 has a cylinder portion (not shown) disposed opposite to the disk 10 of one pad (not shown), and straddles the outer peripheral portion of the disk 11 from one side of the cylinder portion. And a claw portion 53 disposed to face the opposite side of the disk 10 of the other pad 14 from the opposite side to the cylinder portion of the disc path portion 52.
[0029]
The cylinder portion is provided with a bore (not shown) having a circular cross section so as to open to the disk 11 side, and a piston (not shown) is slidably fitted into the bore. The piston presses one of the pads, and the claw portion 53 presses the other pad 14 by the reaction force generated by pressing the piston. As a result, the caliper 17 pushes both the pads 14 from the outer sides. 11 direction.
[0030]
According to the disc brake 10 of the present embodiment described above, the pad guide 13 protrudes outward in the radial direction of the disc from the bent recess 41 so as to protrude from the plate portion 42 of the bent recess 41 and the surface portion of the support recess 33 of the carrier 12. 34 is provided with a clearance holding plate portion 46 that always holds the clearance, so that the outer surface portion 42a in the disk radial direction of the plate portion 42 of the bending recess 41 of the pad guide 13 and the carrier 12 are also provided during braking. It is possible to prevent the support concave portion 33 from rubbing due to contact with the outer surface portion 34 in the disk radial direction. Therefore, it is possible to prevent abnormal noise caused by this rubbing.
[0031]
In addition, since the clearance holding plate portion 46 is cut and raised from the intermediate portion in the disk axial direction of the bent concave portion 41, the clearance holding plate portion 46 can be integrally formed with the pad guide 13 by press molding. Therefore, an increase in cost can be suppressed.
[0032]
In the above, the carrier 12 and the pad 14 are unevenly fitted in the disk circumferential direction, and the pad guide 13 for biasing the pad 14 in the disk radial direction is provided between the carrier 12 and the pad 14. , In the case where the protrusion 14 is provided on the pad 14 and the support recess 33 is provided on the carrier 12, the carrier 12 positioned on the outer diameter side of the disk among the opposing portions in the concave-convex fitting portion between the carrier 12 and the pad 14. The example in which the clearance is always maintained between the surface portion 34 of the carrier 12 and the surface portion 42a of the pad guide 13 of the opposing portion having the surface portion has been described. However, the pad is provided with a concave portion and the carrier is provided with a convex portion. In this case, among the opposing portions in the concave / convex fitting portion between the carrier and the pad, the key of the opposing portion having the surface portion of the carrier located on the disk outer diameter side. It is sufficient to hold the constant clearance between the rear surface portion and the pad guide surface part.
[0033]
【The invention's effect】
As described in detail above, according to the disc brake of the first aspect of the present invention, the carrier surface at the position facing the direction in which the pad is urged among the facing portions in the concave-convex fitting portion between the carrier and the pad. Since the clearance is always maintained between the opposing portions of the pad guide and the pad guide, it is possible to prevent the carrier surface and the pad guide from coming into contact and rubbing even during braking. Therefore, it is possible to prevent abnormal noise caused by this rubbing.
[0034]
According to the disk brake according to claim 2 of the present invention, the pad guide, a clearance between the collision out by bending recesses and support recesses of the carrier than the flexure recesses in the same direction as the direction for urging the pad Since the clearance holding part that is always held is provided, the surface part in the same direction as the pad urging direction of the bent recess of the pad guide and the surface part of the carrier supporting recess facing the pad urging direction are in contact even during braking. Thus, rubbing can be prevented. Therefore, it is possible to prevent abnormal noise caused by this rubbing.
[0035]
According to the disc brake of the third aspect of the present invention, since the clearance holding portion is cut and raised from the middle portion of the bent concave portion, the clearance holding portion can be integrally formed with the pad guide by press molding. Therefore, an increase in cost can be suppressed.
[Brief description of the drawings]
FIG. 1 is a front view showing a disc brake according to an embodiment of the present invention.
FIG. 2 is an enlarged view of portion A in FIG. 1 of the disc brake according to the embodiment of the present invention.
3A and 3B show a pad guide of a disc brake according to an embodiment of the present invention, in which FIG. 3A is a front view, and FIG. 3B is a side view of FIG.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 10 Disc brake 11 Disc 12 Carrier 13 Pad guide 14 Pad 17 Caliper 20 Back metal 23 Protrusion part 33 Supporting recessed part 41 Bending recessed part 46 Clearance holding plate part (clearance holding part)

Claims (3)

The carrier and the pad are unevenly fitted in the disk circumferential direction, and the braking torque of the pad is transmitted to the carrier on the inner side in the disk radial direction from the unevenly fitting part , and the pad is inserted between the carrier and the pad. In the disc brake provided with a pad guide that urges radially outward ,
A clearance is always maintained between the facing portion of the carrier guide and the pad guide at the position facing the direction in which the pad is urged among the facing portions of the concave and convex fitting portion between the carrier and the pad. Disc brake characterized by. A carrier having support recesses that face each other, and these support recesses are spaced apart in the disk circumferential direction;
A pair of pad guides having a bent recess and held by the carrier in a state where the bent recess is inserted into the support recess;
A lining is fixed to a back metal having convex portions formed on both sides, and the convex portion is inserted into the bent concave portion to be guided by the pad guide and slide in the disk axial direction. A pad that transmits braking torque to the carrier on the inner surface in the radial direction of the disk and is urged outward in the radial direction of the disk by the pad guide;
In a disc brake having a caliper that presses the pad toward the disc,
The pad guide is provided with a clearance holding portion that protrudes in the same direction as the direction in which the pad is urged from the bending recess and always maintains a clearance between the bending recess and the support recess of the carrier. Disc brakes characterized by 3. The clearance holding portion is formed by being abutted against a surface of the support recess of the carrier at a position that is cut and raised from an intermediate portion of the bent recess and faces a direction in which the pad is urged. Disc brake as described.

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