Disk brake and assembly provided with disk brake

Abstract

Provided are: a disk brake which radiates braking heat through an axle bracket and improves cooling performance; and an assembly provided with the disk brake. A disk brake 11 comprises a caliper body 13 having a pair of actuation parts 13a, 13b and a bridge part 13c connecting the pair of actuation parts. A mounting part 13f having an insertion hole 13g through which a mounting bolt is inserted is provided on the disk insertion side of one actuation part 13a, and the caliper body 13 is mounted on a disk brake mounting surface 23a of an axle bracket 21 by using the mounting bolt. An axle bracket mounting surface 13i which is brought into contact with the disk brake mounting surface 23a is provided to the mounting part 13f. The axle bracket mounting surface 13i extends toward the disk exit side.

Description

Disk Brake and Assembly Comprising a Disk Brake

[0001] The present invention relates to a disk brake and an assembly comprising a disk brake, and more particularly to a disk brake capable of dissipating braking heat through an axle bracket and an assembly comprising a disk brake.

[0002] Conventionally, as a disk brake for a two-wheeled vehicle, a pair of acting portions arranged to face each other with a disk rotor interposed therebetween are connected by a bridge portion straddling the outer circumference of the disk rotor to form a caliper body, and the caliper body is attached to an axle bracket provided at the lower end of a front fork (see, for example, Patent Document 1).

[0003] Japanese Patent No. 4818307

[0004] With the evolution of vehicles, the load applied to the disk brake has also increased, and if the temperature of the disk brake rises too much due to braking heat, the braking performance deteriorates. Therefore, it is important to cool the disk brake. In the case of the above-described Patent Document 1, since the contact area between the caliper body and the axle bracket is small, it has been difficult to dissipate braking heat through the axle bracket and cool the disk brake.

[0005] Therefore, an object of the present invention is to provide a disk brake and an assembly comprising a disk brake that dissipate braking heat through an axle bracket and improve the cooling performance.

[0006] To achieve the above objective, the present invention provides a disc brake comprising a caliper body having a pair of working parts arranged opposite each other on a disc rotor and having a cylinder hole inside for inserting a piston, and a bridge part that spans the outer circumference of the disc rotor and connects the pair of working parts, wherein a mounting part having an insertion hole for inserting a mounting bolt is provided on at least one side of the working part, either the inlet side or the outlet side in the disc rotation direction, and the caliper body is attached to the disc brake mounting surface of the axle bracket by the mounting bolt, wherein the mounting part is provided with an axle bracket mounting surface that abuts against the disc brake mounting surface, and the axle bracket mounting surface extends toward the other side in the disc rotation direction.

[0007] According to the disc brake of the present invention, by extending the axle bracket mounting surface toward the other side in the direction of disc rotation, the contact area between the caliper body and the axle bracket can be increased. This allows braking heat to be dissipated through the axle bracket, improving the cooling performance of the disc brake.

[0008] This is a front view of a disc brake showing a first embodiment of the present invention. This is a rear view of the same disc brake. This is a top view of the same disc brake. This is a cross-sectional view taken along line IV-IV in Figure 3. This is a cross-sectional view taken along line V-V in Figure 1. This is a front view of the axle bracket. This is a perspective view of the axle bracket. This is a front view of the assembly. This is a rear view of the assembly. This is an exploded perspective view of the assembly. This is a front view of an assembly showing a second embodiment of the present invention.

[0009] Figures 1 to 10 show a first embodiment of the disc brake of the present invention. Arrow A indicates the direction of rotation of the disc rotor, which rotates integrally with the wheel when the vehicle moves forward, and the disc exit side and disc entry side described below refer to the state when the vehicle is moving forward.

[0010] As shown in Figures 8 to 10, the disc brake 11 in this embodiment is attached to an axle bracket 21 provided at the lower end of the front fork 41, and the disc brake 11 and the axle bracket 21 constitute the assembly 31 of the present invention.

[0011] The disc brake 11 comprises a disc rotor 12 that rotates integrally with the wheel, a caliper body 13 attached to the axle bracket 21 on one side of the disc rotor 12, and friction pads 14, 14 positioned opposite each other between a pair of working portions 13a, 13b of the caliper body 13, with the disc rotor 12 in between.

[0012] The caliper body 13 is formed as a monocoque structure with four opposing pistons, connecting a pair of working parts 13a and 13b with a bridge part 13c that straddles the outer circumference of the disc rotor 12. The working parts 13a and 13b have opposing cylinder holes 13d on the disc entry side and cylinder holes 13e on the disc exit side, respectively, and a piston 15 is movably housed in each cylinder hole 13d and 13e. Furthermore, a hydraulic chamber 16 is defined between each cylinder hole 13d and 13e and the piston 15, and adjacent hydraulic chambers 16, 16 are connected by a communication hole 16a.

[0013] A friction pad 14 is positioned between each piston 15 and the disc rotor 12. The friction pad 14 consists of a lining 14a that slides against the side surface of the disc rotor 12 and a metal backing plate 14b to which the lining 14a is attached.

[0014] On the disc entry side (one side in the disc rotation direction of the present invention) of one of the working parts 13a located on the outside of the vehicle, a mounting part 13f to the axle bracket 21 is provided, and a through hole 13g in the radial direction of the disc is formed in the mounting part 13f through which a mounting bolt (not shown) is inserted. Furthermore, on the disc exit side (the other side in the disc rotation direction of the present invention) of the working part 13a, a heat dissipation member mounting part 13h is formed for attaching a heat dissipation member 17, which will be described later. The caliper body 13 is attached to the axle bracket 21 by fastening the mounting bolt inserted through the through hole 13g to the disc brake mounting surface 23a of the axle bracket 21.

[0015] The mounting portion 13f has an axle bracket mounting surface 13i that contacts the disc brake mounting surface 23a. The axle bracket mounting surface 13i extends toward the disc exit side (the other side in the disc rotation direction of the present invention) and extends toward the disc exit side to a position on an extension line EL1 that extends in the radial direction of the disc, passing through the central axis CL1 of the cylinder hole 13d on the disc entry side that is closest to the axle bracket mounting surface 13i, and is formed in a substantially rectangular shape.

[0016] Furthermore, the disc radial direction at a certain point in the caliper body 13 includes not only the direction strictly aligned with the radius of the disc rotor, but also the direction connecting the center of the disc rotor 12 and the center P of the caliper body 13, as shown in Figure 1. For example, at point P1 on the disc rotation side of the caliper body 13, the direction of arrow P2 is included as the disc radial direction.

[0017] One of the working portions 13a is adjacent to the outer side in the disc axial direction of the axle bracket mounting surface 13i and has a first side surface 13j that extends radially inward from the axle bracket mounting surface 13i. When the caliper body 13 is attached to the axle bracket 21, the inner side surface 13k in the disc axial direction of the first side surface 13j abuts against the outer side surface 23c in the disc axial direction of the axle bracket 21 (the first contact surface of the present invention), which is different from the disc brake mounting surface 23a (Figure 10).

[0018] Furthermore, one of the working portions 13a is adjacent to the disc entry side of the axle bracket mounting surface 13i and has a second side surface 13l that is continuous with the first side surface 13j and extends radially inward from the axle bracket mounting surface 13i. When the caliper body 13 is attached to the axle bracket 21, the disc entry side surface 13q of the second side surface 13l abuts against the disc entry side surface 23d (the second contact surface of the present invention) of the axle bracket 21, which is adjacent to the disc brake mounting surface 23a (Figures 9 and 10).

[0019] Furthermore, multiple protrusions 13m extending in the radial direction of the disk are formed on the outer surfaces of the working portions 13a and 13b in the disk axial direction. In addition, a protrusion 13p is formed on the outer surface of the first side surface 13j in the disk axial direction, and is continuous with the protrusions 13m formed on the working portion 13a.

[0020] The heat dissipation member 17 is attached to the heat dissipation member mounting surface 13n formed on the heat dissipation member mounting portion 13h by fixing a fixing member such as a bolt (not shown) to the fixing portion 13r (Figure 10), and is positioned on the disc rotor side of the first side surface 13j. The heat dissipation member 17 has a mounting surface 17a that abuts against the heat dissipation member mounting surface 13n and a plurality of fins 17b, and extends toward the disc entry side to a position on an extension line EL2 that extends in the radial direction of the disc passing through the central axis CL2 of the cylinder hole 13e on the disc exit side. In addition, each fin 17b is formed in alignment with a protrusion 13m provided on the working portion 13a.

[0021] As shown in Figures 6 to 10, the axle bracket 21 is integrally formed with a connecting portion 22 that connects the front fork 41 to the axle and an arm 23 that extends from the connecting portion 22 toward the rear of the vehicle and to which the disc brake 11 is attached.

[0022] The arm 23 has a disc brake mounting surface 23a at its rear end. The disc brake mounting surface 23a is formed in a substantially rectangular shape corresponding to the axle bracket mounting surface 13i, and a female threaded portion 23b for fastening a bolt is provided at a position corresponding to the insertion hole 13g. The female threaded portion 23b is formed on the end side (second side surface 13l side) on the disc insertion side rather than the center of the disc brake mounting surface 23a. As a result, when increasing the contact surface between the disc brake mounting surface 23a and the axle bracket mounting surface 13i, the increase is directed toward the center P direction of the caliper body 13, and there is no need to increase it toward the disc insertion side, so the caliper body 13 does not become larger.

[0023] The connecting portion 22 includes a front fork support portion 22a that supports the lower end of the front fork 41, a brake support portion 22b integrally provided below the front fork support portion 22a, and an axle support portion 22c integrally provided below the brake support portion 22b. The front fork support portion 22a is formed in a bottomed cylindrical shape with an open top, and fits and fixes the lower end of the front fork 41. The axle support portion 22c is provided with a circular hole 22d that supports the axle of the front wheel.

[0024] The brake support portion 22b is formed with a ventilation portion 22e that passes through it from the front of the vehicle to the rear of the vehicle, allowing airflow in the direction of arrow B. Furthermore, when the caliper body 13 is attached to the axle bracket 21, the heat dissipation member 17 is positioned on the extension of the ventilation direction of the ventilation portion 22e.

[0025] As described above, the disc brake 11 is attached to the axle bracket 21 by bringing the axle bracket mounting surface 13i and the disc brake mounting surface 23a into contact and tightening bolts.

[0026] In this embodiment, the disc brake 11 is formed in a substantially rectangular shape with the axle bracket mounting surface 13i extending toward the disc rotation side, and the disc brake mounting surface 23a is formed in a substantially rectangular shape corresponding to the axle bracket mounting surface 13i. This increases the contact area between the caliper body 13 and the axle bracket 21. As a result, the axle bracket 21 can be used as a heat dissipation member for the braking heat generated in the disc brake 11 during braking, thereby improving the cooling performance of the disc brake 11.

[0027] Furthermore, by providing a first side surface 13j on one of the working parts 13a, and bringing the inner surface 13k of the first side surface 13j in the disc axial direction into contact with the outer surface 23c of the axle bracket 21 in the disc axial direction, the contact area between the caliper body 13 and the axle bracket 21 can be further increased, thereby further improving the cooling performance of the disc brake 11. In addition, since the first side surface 13j covers the contact portion between the axle bracket mounting surface 13i and the disc brake mounting surface 23a, the assembly of the disc brake and the axle bracket can be made to appear more integrated, thereby improving the design.

[0028] Furthermore, by providing a second side surface 13l on one of the working parts 13a, and bringing the disc rotation side surface 13q of the second side surface 13l into contact with the disc entry side surface 23d of the axle bracket 21, the contact area between the caliper body 13 and the axle bracket 21 can be further increased, thereby further improving the cooling performance of the disc brake 11. In addition, since the first side surface 13j and the second side surface 13l come into contact with the disc axial outer surface 23c and the disc entry side surface 23d of the axle bracket 21, respectively, they serve to position and prevent rotation of the caliper body when attaching it to the axle bracket 21, thereby improving ease of assembly. Furthermore, since the second side surface 13l covers the contact portion between the axle bracket mounting surface 13i and the disc brake mounting surface 23a, the assembled disc brake and axle bracket can be made to appear more integrated, improving the design.

[0029] Furthermore, by attaching the heat dissipation member 17 to the disc rotation side of one of the working parts 13a, which is opposite to the side attached to the axle bracket 21, braking heat can be dissipated through the heat dissipation member 17, further improving the cooling performance of the disc brake 11. In addition, since the heat dissipation member 17 is equipped with multiple fins 17b, the surface area is increased, allowing for better dissipation of braking heat. Moreover, since each fin 17b is formed in alignment with each protrusion 13m provided on the disc rotation side of the working part 13a, the design can be improved.

[0030] Furthermore, the axle bracket 21 is equipped with a ventilation section 22e in the brake support section 22b that allows airflow towards the rear of the vehicle, and the heat dissipation member 17 is positioned on the extension of the ventilation direction of the ventilation section 22e in the direction of vehicle travel. As a result, the airflow hitting the heat dissipation member 17 allows for efficient heat dissipation from the disc brake 11.

[0031] Figure 11 shows a second embodiment of the present invention. Components similar to those in the first embodiment are denoted by the same reference numerals, and their detailed descriptions are omitted.

[0032] In this embodiment, one operating portion 51a of the caliper body 51 has a mounting portion 51c on the disc rotation side that has an insertion hole 51b in the radial direction of the disc. The other mounting portion 51c has a mounting surface 51d on the other side of the axle bracket that contacts the other side of the disc brake mounting surface 61a provided on the axle bracket 61. This other side of the axle bracket mounting surface 51d extends toward the disc entry side (one side in the disc rotation direction of the present invention) to a position on the extension line EL2 of the central axis CL2 of the cylinder hole 13e on the disc rotation side that is closest to the other side of the axle bracket mounting surface 51d. Furthermore, the axle bracket mounting surface 13i and the other side of the axle bracket mounting surface 51d are formed on the same plane F1.

[0033] The arm 23 includes a sub-arm 62 that extends radially outward from its intermediate portion, and the tip of the sub-arm 62 is provided with the other side disc brake mounting surface 61a.

[0034] Furthermore, on the disc entry side of one of the operating portions 51a of the caliper body 51, a mounting portion 13f for the axle bracket 61 is provided, similar to the first embodiment, and an axle bracket mounting surface 13i is formed on the mounting portion 13f. The axle bracket mounting surface 13i extends toward the disc exit side, and extends toward the disc exit side to a position on the extension line EL1 of the central axis CL1 of the cylinder hole 13d on the disc entry side that is closest to the axle bracket mounting surface 13i, and is formed in a substantially rectangular shape.

[0035] Furthermore, similar to the first embodiment, the axle bracket 61 has a disc brake mounting surface 23a formed at the tip of the arm 23.

[0036] As described above, the caliper body 51 is attached to the axle bracket 61 by bringing the axle bracket mounting surface 13i into contact with the disc brake mounting surface 23a and the other axle bracket mounting surface 51d into contact with the other disc brake mounting surface 61a, and then fastening the mounting bolts. As a result, the axle bracket mounting surfaces 13i and the other axle bracket mounting surface 51d on the disc entry side and disc exit side of the caliper body 51 into contact with the axle bracket 61, respectively, and the contact area is increased, which allows for good heat dissipation during braking.

[0037] In the first embodiment described above, a mounting portion for the axle bracket is provided on the disc entry side of one of the working parts of the caliper body, and in the second embodiment, mounting portions are provided on both the disc entry side and the disc exit side of one of the working parts. However, the present invention is not limited to these, and a mounting portion may be provided only on the disc exit side. Furthermore, the caliper body of the present invention is not limited to a monocoque structure as in the above embodiments, but can also be applied to a split-type caliper body. In addition, the number of pistons is arbitrary.

[0038] Furthermore, although the above-described embodiment uses a radial mount type caliper body in which the mounting bolt insertion holes are formed in the radial direction of the disc, the present invention is not limited to this and can also be applied to an axial mount type caliper body equipped with mounting bolt insertion holes in the axial direction of the disc. In addition, the structure of the axle bracket is also arbitrary; for example, an arm may be extended from the connecting part toward the rear of the vehicle, and the disc exit side mounting surface and the disc entry side mounting surface may be formed on the same plane at the tip of the arm, and a caliper body contact portion that the caliper body abuts against may also be continuously formed between the disc exit side mounting surface and the disc entry side mounting surface. Furthermore, since the axle bracket mounting surface 13i and the other side axle bracket mounting surface 51d are formed on the same plane F1, a good heat dissipation effect can be obtained.

[0039] Furthermore, the heat dissipation member 17 may be attached to the heat dissipation member mounting surface 13n formed on the heat dissipation member mounting portion 13h by a bolt inserted through the other side mounting portion 51c, or it may be directly fixed to the heat dissipation member mounting portion by fitting, adhesive, welding, etc., and the method of attachment is arbitrary.

[0040] 11...Disc brake, 12...Disc rotor, 13...Caliper body, 13a, 13b...Operating part, 13c...Bridge part, 13d, 13e...Cylinder bore, 13f...Mounting part, 13g...Through hole, 13h...Heat dissipation member mounting part, 13i...Axle bracket mounting surface, 13j...First side surface, 13k...Disc axial inner surface, 13l...Second side surface, 13m...Protrusion, 13n...Heat dissipation member mounting surface, 13p...Protrusion, 13q...Disc rotation side surface, 13r...Fixed part, 14...Friction pad, 14a...Lining, 14b...Backing plate, 15...Piston, 16...Hydraulic chamber, 16a...Communication hole, 17...Heat dissipation member, 17a...Mounting Surface, 17b...Fin, 21...Axle bracket, 22...Connecting part, 22a...Front fork support part, 22b...Brake support part, 22c...Axle support part, 22d...Circular hole, 22e...Ventilation part, 23...Arm, 23a...Disc brake mounting surface, 23b...Female thread part, 23c...Disc axial outer surface, 23d...Disc entry side, 31...Assembly, 41...Front fork, 51...Caliper body, 51a...Operating part, 51b...Through hole, 51c...Other side mounting part, 51d...Other side axle bracket mounting surface, 61...Axle bracket, 61a...Other side disc brake mounting surface, 62...Sub-arm

Claims

1. A disc brake comprising a caliper body having a pair of working parts arranged opposite each other on a disc rotor and having a cylinder bore inside for inserting a piston, and a bridge part that straddles the outer circumference of the disc rotor and connects the pair of working parts, wherein one of the working parts has a mounting part having an insertion hole for inserting a mounting bolt on at least one side of the rotational direction of the disc, either the inlet side or the outlet side, and the caliper body is attached to the disc brake mounting surface of the axle bracket by the mounting bolt, wherein the mounting part has an axle bracket mounting surface that contacts the disc brake mounting surface, and the axle bracket mounting surface extends toward the other side in the direction of disc rotation.

2. The disc brake according to claim 1, characterized in that the axle bracket mounting surface extends toward the other side in the disc rotation direction to a position on an extension line that extends in the disc radial direction through the central axis of the cylinder bore closest to the axle bracket mounting surface.

3. The disc brake according to claim 1, characterized in that the mounting portion is provided with the insertion hole in the radial direction of the disc.

4. The disc brake according to claim 1, wherein one of the working parts has a first side surface adjacent to the axle bracket mounting surface on the outer side in the disc axial direction, the first side surface extends radially inward from the axle bracket mounting surface and abuts against a first contact surface of the axle bracket that is different from the axle bracket mounting surface.

5. The disc brake according to claim 4, wherein one of the working parts has a second side surface adjacent to the axle bracket mounting surface and the first side surface, the second side surface extends radially inward from the axle bracket mounting surface and contacts a second contact surface of the axle bracket that is different from the disc brake mounting surface.

6. The disc brake according to claim 1, wherein the one working part is provided with a other-side mounting part having an insertion hole for inserting a mounting bolt on either the inlet side or the outlet side in the direction of disc rotation, the other-side mounting part is provided with a other-side axle bracket mounting surface that abuts against the other-side disc brake mounting surface provided on the axle bracket, and the other-side axle bracket mounting surface extends toward one side in the direction of disc rotation to a position that reaches the extension of the central axis of the cylinder hole closest to the other-side axle bracket mounting surface.

7. The disc brake according to claim 6, characterized in that the mounting portion and the other mounting portion each have the insertion hole in the radial direction of the disc.

8. An assembly comprising a disc brake according to claim 6 or 7, wherein the axle bracket mounting surface and the other axle bracket mounting surface are formed on the same plane, the axle bracket comprises an arm having the disc brake mounting surface and the other disc brake mounting surface, and the axle bracket mounting surface is attached to the disc brake mounting surface by mounting bolts, and the other axle bracket mounting surface is attached to the other disc brake mounting surface by mounting bolts.

9. The disc brake according to claim 1, characterized in that a heat dissipation member is attached to the other side of either the inlet or outlet side in the disc rotation direction of one of the working parts, and the heat dissipation member extends toward either the inlet or outlet side in the disc rotation direction to a position on an extension line that extends in the radial direction of the disc passing through the central axis of the cylinder bore closest to the heat dissipation member.

10. The disc brake according to claim 9, characterized in that the heat dissipation member is formed in a fin shape.

11. An assembly comprising a disc brake according to claim 9 or 10, wherein one of the operating parts is provided with the mounting part on the inlet side in the disc rotation direction and the heat dissipation member on the outlet side, the axle bracket comprises an axle support part that pivotally supports the axle and an arm that extends from the axle support part toward the rear of the vehicle and has the disc brake mounting surface, the axle support part is provided with a ventilation part that allows air to pass through toward the rear of the vehicle, and the heat dissipation member is positioned on the extension of the ventilation direction of the ventilation part in the direction of vehicle travel.

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