Caliper body mounting structure for vehicle disc brake

Abstract

Provided is a caliper body mounting structure for a vehicle disc brake, which can be mounted on a wide range of wheel suspension devices while ensuring the mounting rigidity of a radial mount caliper body. In the working portion of a caliper body 2, bolt insertion holes 2e, 2e in a direction orthogonal to a disc axis are formed on both sides in the circumferential direction of the disc. A caliper bracket 4 is formed with: internally threaded holes 4c, 4c (caliper mounting holes) in the direction orthogonal to the disc axis, for mounting the caliper body 2; and vehicle body mounting holes 4e, 4e in the disc axis direction, for mounting the caliper body 2 to caliper mounting portions 3a, 3a that are formed on a front fork 3. The caliper body 2 is mounted to the caliper mounting portions 3a, 3a with the caliper bracket 4 interposed therebetween.

Description

[Technical field]

[0001] The present invention relates to a caliper body mounting structure for a vehicle disc brake, and more particularly to a caliper body mounting structure for a vehicle disc brake that mounts a radial mount type vehicle disc brake to a vehicle body via a bracket. [Background technology]

[0002] Conventionally, in a radial mount type caliper body in which bolt insertion holes in a direction perpendicular to the disk axis are formed on both sides in the disk circumferential direction in an action part equipped with a piston of the caliper body, and a caliper mounting bolt inserted into the bolt insertion hole is fastened to the vehicle body side, the caliper body is attached to a caliper mounting part integrally provided on a protruding wheel suspension by fastening a male thread part of the caliper mounting bolt inserted into the bolt insertion hole (see, for example, Patent Document 1). Also, in an axial mount type caliper body in which bolt insertion holes in the disk axial direction are formed on the disk rotation side and the disk inner peripheral side in an action part equipped with a piston of the caliper body, and a caliper mounting bolt inserted into the bolt insertion hole is fastened to the vehicle body side, the caliper body is attached to a caliper mounting part integrally provided on a protruding wheel suspension by fastening a male thread part of the caliper mounting bolt inserted into the bolt insertion hole (see, for example, Patent Document 2). [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2001-280376 A [Patent Document 2] Patent No. 4293708 Summary of the Invention [Problem to be solved by the invention]

[0004] However, although the radial mount type caliper body of the above-mentioned Patent Document 1 has the advantage of high mounting rigidity, it is necessary to ensure a sufficient joint area between the caliper body and the caliper mounting part so that the caliper body does not move even when subjected to the rotational moment generated in the disc rotation direction during braking, which results in a large caliper mounting part. Furthermore, it is not possible to directly mount the radial mount type caliper body to the caliper mounting part of the wheel suspension device.

[0005] SUMMARY OF THE PRESENT EMBODIMENTS The present invention has an object to provide a caliper body mounting structure for a vehicle disc brake which can be mounted to a wide range of wheel suspensions while ensuring the mounting rigidity of a radial mount type caliper body. [Means for solving the problem]

[0006] In order to achieve the above object, the caliper body mounting structure for a vehicle disc brake of the present invention comprises a caliper body having a piston arranged across the outer periphery of a disc rotor, and bolt insertion holes perpendicular to the disc axis are formed on both sides in the disc circumferential direction, and the caliper body is mounted to a caliper mounting section provided on a wheel suspension using a caliper mounting bolt inserted into the bolt insertion hole. In this caliper body mounting structure for a vehicle disc brake, a caliper bracket is formed having a caliper mounting hole perpendicular to the disc axis to which the caliper body is attached and a vehicle body mounting hole in the disc axial direction attached to the caliper mounting section, a bracket mounting hole in the disc axial direction is formed in the caliper mounting section, a vehicle body mounting bolt is fastened between the vehicle body mounting hole and the bracket mounting hole, and the caliper mounting bolt is fastened between the bolt insertion hole and the caliper mounting hole, thereby mounting the caliper body to the caliper mounting section via the caliper bracket.

[0007] In addition, it is preferable that the caliper bracket is arranged on the vehicle body outer side of the caliper mounting portion, and a plate-shaped fastening member having a female threaded portion that screws into the male threaded portion of the vehicle body mounting bolt is arranged at a position corresponding to the bracket mounting hole on the vehicle body side of the caliper mounting portion, and the caliper bracket is attached to the caliper mounting portion by fastening the male threaded portion of the vehicle body mounting bolt that has been inserted through the vehicle body mounting hole and the bracket mounting hole to the female threaded portion.

[0008] Furthermore, it is preferable that a plurality of bracket mounting holes are formed, and that the fastening member is integrally formed with female threads arranged at positions corresponding to the plurality of bracket mounting holes via a connecting portion. Effect of the Invention

[0009] According to the caliper body mounting structure for a vehicle disc brake of the present invention, the caliper mounting portion can be made smaller while ensuring the mounting rigidity of the radial mount type caliper body. Furthermore, it is possible to mount a radial mount type caliper body to the caliper mounting portion of a wheel suspension device to which an axial mount type caliper body is attached, and the radial mount type caliper body can be mounted to a wider range of wheel suspension devices, including the caliper mounting portion of an axial mount type wheel suspension device. Furthermore, by changing the shape of the caliper bracket, the mounting position of the caliper body can be adjusted according to changes in the size of the outer circumferential diameter of the disc rotor and the dimensions of the wheel suspension device, improving layout flexibility.

[0010] Furthermore, the caliper bracket is disposed on the vehicle body outer side of the caliper mounting portion, and a plate-shaped fastening member having an internal thread portion that screws into the external thread portion of the vehicle body mounting bolt is disposed at a position on the vehicle body inner side of the caliper mounting portion corresponding to the bracket mounting hole, and the external thread portion of the vehicle body mounting bolt that is inserted through the vehicle body mounting hole and the bracket mounting hole is fastened to the internal thread portion to mount the caliper bracket to the caliper mounting portion, thereby increasing the mounting rigidity of the caliper bracket without being affected by the clearance between the caliper mounting portion and the disc rotor. Also, because the mounting rigidity of the caliper bracket can be increased, even if the caliper body is subjected to a rotational moment generated in the disc rotation direction during braking, the rotational moment can be reliably received by the caliper body and the caliper bracket, and movement of the caliper body can be suppressed.

[0011] Furthermore, by forming multiple bracket mounting holes and forming the fastening member with female threaded portions that are arranged at positions corresponding to each of the multiple bracket mounting holes integrally via a connecting portion, the caliper bracket can be easily assembled and the caliper bracket can be assembled to the caliper mounting portion with high precision. [Brief description of the drawings]

[0012] [Figure 1] 1 is a front view of a main portion showing an example of a caliper body mounting structure of the present invention; [Diagram 2] FIG. 4 is a plan view of a main portion showing an example of a caliper body mounting structure. [Diagram 3] FIG. 4 is a rear view of a main portion showing an example of the caliper body mounting structure. [Figure 4] FIG. 4 is a cross-sectional view taken along line IV-IV of FIG. [Diagram 5] 1 is a front view showing an example of a caliper body mounting structure of the present invention; DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0013] 1 to 5 are diagrams showing an example of a caliper body mounting structure for a vehicle disc brake according to the present invention. Arrow A indicates the rotation direction of a disc rotor that rotates together with the wheel when the vehicle moves forward, and the disc rotation outward and inward sides described below are those when the vehicle moves forward.

[0014] A vehicle disc brake 1 of this embodiment has a radial mount type caliper body 2 attached via a caliper bracket 4 to a pair of caliper attachment portions 3a, 3a provided on the lower end side of a front fork 3 (wheel suspension device).

[0015] The caliper body 2 includes a pair of action parts 2a, 2a disposed opposite to each other on both sides of a disc rotor 5 that is supported on the lower end of the front fork 3 and rotates integrally with the wheel, and a bridge part 2b that connects these parts across the outer periphery of the disc rotor 5, and the action parts 2a, 2a are each formed with a cylinder hole 2c, 2c that houses a piston 7, 7 that presses a friction pad 6 against the disc rotor 5. The caliper body 2 has mounting boss parts 2d, 2d formed in the action part 2a on the vehicle body mounting side disposed on one side of the disc rotor 5, and is attached to the caliper bracket 4 by using caliper mounting bolts 8, 8 that are inserted into bolt insertion holes 2e, 2e formed in the mounting boss parts 2d, 2d.

[0016] The mounting boss portions 2d, 2d are formed on the disk rotation-in side and disk rotation-out side of the action portion 2a by padding in a direction perpendicular to the disk axis, i.e., parallel to an imaginary line L1 perpendicular to the disk axis connecting the rotation center of the disk rotor 5 and the pad pressing center of the caliper body 2, and the bolt insertion holes 2e, 2e, which have a diameter slightly larger than that of the caliper mounting bolts 8, 8, are formed through the mounting boss portions 2d, 2d in a direction parallel to the above-mentioned imaginary line L1 perpendicular to the disk axis.

[0017] The caliper mounting portions 3a, 3a formed on the front fork 3 protrude from the vehicle body rear side of the front fork 3 on the radially outer side of the disc and on the radially inner side of the disc, and a caliper bracket 4 is attached via a plate-shaped fastening member 10 using a vehicle body mounting bolt 9. The caliper mounting portions 3a, 3a have bracket mounting holes 3b, 3b having a diameter slightly larger than that of the vehicle body mounting bolts 9, 9, formed therethrough in the disc axial direction.

[0018] The caliper bracket 4 includes a vehicle body mounting arm 4a attached to the caliper mounting portion 3a, 3a, and a caliper body mounting arm 4b extending from the end of the vehicle body mounting arm 4a on the inner side in the disk radial direction in a direction substantially perpendicular to an imaginary line L1 perpendicular to the disk axis. The caliper body mounting arm 4b includes boss portions 4d, 4d that are coaxial with the bolt insertion holes 2e, 2e and have female threaded holes 4c, 4c (caliper mounting holes) therein that screw into the male threaded portions 8a, 8a of the caliper mounting bolts 8, 8. The vehicle body mounting arm 4a also includes vehicle body mounting holes 4e, 4e that are coaxial with the bracket mounting holes 3b, 3b and have a diameter slightly larger than that of the vehicle body mounting bolts 9, 9 and are formed therethrough.

[0019] The fastening member 10 is formed in a plate shape integral with female threaded portions 10a, 10a that are respectively arranged at positions corresponding to the bracket mounting holes 3b, 3b, and a connecting portion 10b that connects the female threaded portions 10a, 10a, and the female threaded portions 10a, 10a are formed to screw into the male threaded portions 9a, 9a of the vehicle body mounting bolts 9, 9.

[0020] To attach the caliper body 2, first, the body mounting arm 4a of the caliper bracket 4 is placed on the vehicle body outer side of the caliper mounting portions 3a, 3a of the front fork 3, and the female threaded portions 10a, 10a of the fastening member 10 are placed at positions corresponding to the bracket mounting holes 3b, 3b on the vehicle body side of the caliper mounting portions 3a, 3a. The male threaded portions 9a, 9a of the body mounting bolts 9, 9 inserted through the vehicle body mounting holes 4e, 4e and the bracket mounting holes 3b, 3b are fastened to the female threaded portions 10a, 10a of the fastening member 10, thereby attaching the caliper bracket 4 to the caliper mounting portions 3a, 3a.

[0021] Next, the outer peripheral disc side surface of the boss portion 4d, 4d of the caliper body mounting arm 4b of the caliper bracket 4 is butted against the inner peripheral disc side surface of the mounting boss portion 2d, 2d of the caliper body 2, and the caliper mounting bolts 8, 8 are inserted into the bolt insertion holes 2e, 2e, and the male threaded portions 8a, 8a are fastened to the female threaded holes 4c, 4c, thereby attaching the caliper body 2 to the caliper bracket 4.

[0022] The caliper body mounting structure of this embodiment is configured as described above, and thus the caliper mounting portions 3a, 3a can be made smaller than before while ensuring the mounting rigidity of the radial mount type caliper body 2. Furthermore, it is possible to mount the radial mount type caliper body 2 to the caliper mounting portion of the wheel suspension device to which the axial mount type caliper body 2 is attached, and the radial mount type caliper body can be mounted to a wider range of wheel suspension devices, including the caliper mounting portion of the axial mount type wheel suspension device. Furthermore, by changing the shape of the caliper bracket 4, it is possible to adjust the mounting position of the caliper body 2 according to the change in the size of the outer circumferential diameter of the disc rotor 5 and the dimensions of the wheel suspension device, thereby improving the layout flexibility.

[0023] Furthermore, the caliper bracket 4 is disposed on the vehicle body outer side of the caliper mounting parts 3a, 3a, and the fastening member 10 is disposed on the vehicle body inner side of the caliper mounting parts 3a, 3a, and the male threaded parts 8a, 8a of the vehicle body mounting bolts 9, 9 inserted through the vehicle body mounting holes 4e, 4e and the bracket mounting holes 3b, 3b are fastened to the fastening member 10 to mount the caliper bracket 4 to the caliper mounting parts 3a, 3a, thereby increasing the mounting rigidity of the caliper bracket 4 without being affected by the clearance between the caliper mounting parts 3a, 3a and the disc rotor 5. Furthermore, since the mounting rigidity of the caliper bracket can be increased, even if the caliper body 2 receives a rotational moment generated in the disc rotation direction during braking, the rotational moment can be reliably received by the caliper body and the caliper bracket, and the movement of the caliper body 2 can be suppressed.

[0024] Furthermore, the fastening member 10 is integrally formed with two female threaded portions 10a, 10a that are respectively positioned at positions corresponding to the bracket mounting holes 3b, 3b, and a connecting portion 10b that connects these female threaded portions 10a, 10a, making it easy to assemble the caliper bracket 4 and enabling the caliper bracket 4 to be assembled to the caliper mounting portions 3a, 3a with high precision.

[0025] The present invention is not limited to the above-mentioned embodiment, and the number of cylinder holes formed in the caliper body may be any number. The shapes of the vehicle body mounting arm and the caliper body mounting arm of the caliper bracket may be any shape depending on the size and shape of the caliper body. Furthermore, the fastening member does not have to connect the female thread portion with the connecting portion. [Explanation of symbols]

[0026] 1...vehicle disc brake, 2...caliper body, 2a...action portion, 2b...bridge portion, 2c...cylinder hole, 2d...mounting boss portion, 2e...bolt insertion hole, 3...front fork, 3a...caliper mounting portion, 3b...bracket mounting hole, 4...caliper bracket, 4a...vehicle body mounting arm, 4b...caliper body mounting arm, 4c...female thread hole, 4d...boss portion, 4e...vehicle body mounting hole, 5...disc rotor, 6...friction pad, 7...piston, 8...caliper mounting bolt, 8a...male thread portion, 9...vehicle body mounting bolt, 9a...male thread portion, 10...fastening member, 10a...female thread portion, 10b...connecting portion

Claims

1. a caliper body mounting structure for a vehicle disc brake, in which a caliper body is mounted to a caliper mounting section provided on a wheel suspension by using a caliper mounting bolt inserted into the bolt insertion hole, the caliper body mounting structure comprising: a vehicle body mounting arm having a vehicle body mounting hole in the disc axial direction mounted to the caliper mounting section; and a caliper mounting arm extending from an end of the vehicle body mounting arm on an inner side in the disc radial direction and having a caliper mounting hole in a direction perpendicular to the disc axis to which the caliper body is attached; a bracket mounting hole in the disc axial direction is formed in the caliper mounting section; a vehicle body mounting bolt is fastened between the vehicle body mounting hole and the bracket mounting hole; and the caliper body is mounted to the caliper mounting section via the caliper bracket by fastening the caliper mounting bolt between the bolt insertion hole and the caliper mounting hole; the vehicle body mounting arm of the caliper bracket is disposed on the vehicle body outer side of the caliper mounting portion, and a plate-shaped fastening member having an internal thread portion which screws into the external thread portion of the vehicle body mounting bolt is disposed at a position corresponding to the bracket mounting hole on the vehicle body inner side of the caliper mounting portion, and the caliper bracket is attached to the caliper mounting portion by fastening the external thread portion of the vehicle body mounting bolt which has been inserted through the vehicle body mounting hole and the bracket mounting hole to the internal thread portion; A plurality of bracket mounting holes are formed, and the fastening member has female threads that are arranged at positions corresponding to the plurality of bracket mounting holes and are integrally formed with the fastening member via a connecting portion.

1. A vehicle disc brake caliper body mounting structure comprising:

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