Disc brake and friction pad

Abstract

This disc brake 1 increases the surface area of a projection part provided on a back plate of a friction pad while avoiding interference with components around a caliper body, and comprises: a caliper body 3 including action parts 3a, 3b connected by a bridge part; and a pair of friction pads 4. The bridge part includes a disc turn-in side bridge part 3c, a disc turn-out side bridge part 3d, and an intermediate bridge part 3e, and has a first ceiling opening 3f between the disc turn-in side bridge part 3c and the intermediate bridge part 3e, and a second ceiling opening 3g between the disc turn-out side bridge part 3d and the intermediate bridge part 3e. The friction pad 4 has, on a back plate 4a to which a lining 4c is attached, a plurality of projection parts 4f that are inserted into the first ceiling opening 3f and the second ceiling opening 3g. A projection 4g projecting to a disc rotor 2 side is formed in each projection part 4f.

Description

Disc brakes and friction pads

[0001] The present invention relates to a disc brake and a friction pad for the disc brake, and more particularly to a disc brake and a friction pad for the disc brake that are provided with a structure for radiating braking heat to the outside air.

[0002] Conventionally, in vehicle disc brakes, in order to prevent the temperature of the hydraulic fluid from rising due to braking heat generated by friction between the lining (friction portion) of the friction pad and the disc rotor during braking, a plate-like protrusion has been provided on the back plate of the friction pad, protruding outward from an opening in the ceiling of the caliper body, and the braking heat is dissipated to the outside air via this protrusion (see, for example, Patent Document 1).

[0003] WO2021070892A1

[0004] However, in the case of the above-mentioned Patent Document 1, when an attempt is made to increase the surface area of ​​the protrusion to increase the amount of heat dissipation, there is a risk that the shape of the protrusion will change, causing the protrusion to interfere with parts around the caliper body, such as the wheel, and there are therefore limitations on increasing the surface area.

[0005] Therefore, an object of the present invention is to provide a disc brake and a friction pad that can increase the surface area of ​​the friction pad and improve cooling performance while avoiding interference with parts around the caliper body.

[0006] In order to achieve the above object, the disc brake of the present invention comprises a caliper body having a ceiling opening in a bridge portion that straddles the outer periphery of the disc rotor, and a pair of friction pads that are arranged on either side of the disc rotor, with the disc rotor sandwiched between them, and the friction pads have a back plate with a friction portion provided with a protrusion that is inserted into the ceiling opening, and the protrusion has a convex portion that protrudes at least toward the disc rotor side.

[0007] The friction pad of the present invention is also characterized in that a friction portion is provided on one side of the backing plate, the backing plate has a protruding portion that protrudes in one direction from an end face adjacent to the one side, and the protruding portion has a convex portion that protrudes in the thickness direction of the friction pad on at least one side.

[0008] According to the disc brake and disc brake friction pad of the present invention, the surface area of ​​the protrusion can be increased while avoiding interference with components around the caliper body, thereby improving the cooling effect.

[0009] 14. A cross-sectional view taken along line II of FIG. 3. A front view of a disc brake showing a first embodiment of the present invention. A plan view of the same. A front view of a friction pad of the same. A side view of the friction pad of the same. A rear view of the friction pad of the same. A perspective view of the friction pad of the same. A front view of a friction pad of a disc brake showing a second embodiment of the present invention. A side view of the friction pad of the same. A rear view of the friction pad of the same. A perspective view of the friction pad of the same. A cross-sectional view taken along line XII-XII of FIG. 14. A front view of a disc brake showing a third embodiment of the present invention. A plan view of the same. A plan view of the same during operation.

[0010] 1 to 7 are diagrams showing a first embodiment of the disc brake of the present invention. Note that arrow A indicates the rotation direction of the disc rotor that rotates integrally with the wheel when the vehicle is moving forward, and the disc rotation outward and disc rotation inward described below refer to the direction when the vehicle is moving forward.

[0011] The disc brake 1 comprises a disc rotor 2 that rotates integrally with the wheel, a piston-opposed caliper body 3 that is attached to the vehicle body on one side of the disc rotor 2, and a pair of friction pads 4, 4 that are arranged between working portions 3a, 3b of the caliper body 3 that are disposed on both sides of the disc rotor 2, sandwiching the disc rotor 2 therebetween.

[0012] The caliper body 3 has a monocoque structure that integrally includes a pair of acting portions 3a, 3b and a bridge portion that straddles and connects the pair of acting portions 3a, 3b on the outer periphery of the disc. The bridge portion has a disc rotation-side bridge portion 3c, a disc rotation-side bridge portion 3d, and an intermediate bridge portion 3e provided between the disc rotation-side bridge portion 3c and the disc rotation-side bridge portion 3d. A first ceiling opening 3f is formed between the disc rotation-side bridge portion 3c and the intermediate bridge portion 3e, and a second ceiling opening 3g is formed between the disc rotation-side bridge portion 3d and the intermediate bridge portion 3e.

[0013] Each of the working portions 3a, 3b has two opposing cylinder holes 3h each capable of accommodating a piston 5, and a hydraulic chamber (not shown) is defined between each of the pistons 5 and the cylinder holes 3h.

[0014] The caliper body 3 is attached to the vehicle body by inserting a mounting bolt (not shown) into each of the mounting bolt holes 3j and screwing it into a caliper mounting portion provided on the vehicle body.

[0015] 1, each of the action portions 3a, 3b has a friction pad accommodating portion 6 formed therein for accommodating the friction pad 4. The friction pad accommodating portion 6 includes a rotation-in side torque receiving surface 6a formed inside the caliper body relative to the first ceiling opening 3f and on the disc rotation side relative to the first ceiling opening 3f, a rotation-out side torque receiving surface 6b formed inside the caliper body relative to the second ceiling opening 3g and on the disc rotation side relative to the second ceiling opening 3g, and pad support portions 6c, 6c that support the friction pad 4 on the radially inner side of the disc.

[0016] The friction pad 4 is formed by adhering four linings 4c (friction portions of the present invention) to one side surface 4b of a back plate 4a. The back plate 4a has a lining attachment portion 4d on one side surface 4b to which the linings 4c are attached, and further has eight protrusions 4f that protrude outward in the radial direction of the disk formed integrally with the back plate 4a on an end surface 4e on the outer side in the disk radial direction adjacent to the one side surface 4b.

[0017] Four protrusions 4f are formed on the disc entry side of the back plate 4a, and four on the disc exit side. The four protrusions 4f on the disc entry side are inserted into the first ceiling opening 3f, and the four protrusions 4f on the disc exit side are inserted into the second ceiling opening 3g. Also, on one side 4b of each protrusion 4f, a convex portion 4g is formed integrally with the protrusion 4f, protruding toward the disc rotor 2 (protruding in the thickness direction of the friction pad 4).

[0018] Furthermore, six radially inward protrusions 4i are formed integrally with the back plate 4a on an end surface 4h adjacent to one side surface 4b of the back plate 4a, protruding radially inward in the disk direction. Three radially inward protrusions 4i are formed on the disk entry side and three on the disk exit side, approximately corresponding to the positions of the protrusions 4f.

[0019] Furthermore, the caliper body 3 is provided with four first caliper protrusions 3k (caliper protrusions of the present invention) that protrude outward from the caliper body from each of the first and second ceiling openings 3f, 3g to one of the action portions 3a in accordance with the protrusion positions of the protrusions 4f. Similarly, four first caliper protrusions 3k (caliper protrusions of the present invention) that protrude outward from the caliper body are also provided from each of the first and second ceiling openings 3f, 3g to the other action portion 3b. Furthermore, in accordance with the protrusion positions of the disc radially inner protrusions 4i, three second caliper protrusions 3n that protrude outward from the caliper body are formed on each of the disc rotation outlet side and the disc rotation inlet side from the disc radially inner portions 3m, 3m of each action portion 3a, 3b.

[0020] The disc brake 1 of this embodiment is configured as described above, and thus allows braking heat generated by the sliding contact between the friction pad 4 and the disc rotor 2 during braking to be released to the outside air through the first ceiling opening 3f and the second ceiling opening 3g via the multiple protrusions 4f that protrude outward from the caliper body 3. Furthermore, by providing the convex portions 4g on each protrusion 4f, the surface area of ​​the friction pad 4 can be increased while limiting the amount of protrusion of the protrusions 4f, thereby improving the cooling effect. Furthermore, since the back plate 4a, the protrusions 4f, and the convex portions 4g are integrally formed, heat transfer efficiency is good and the number of parts is not increased. Furthermore, by providing the disc radially inner protrusions 4i on the end surface 4h of the back plate 4a that is radially inner in the disc direction, the surface area of ​​the friction pad 4 can be further increased, thereby further improving the cooling effect.

[0021] In addition, the convex portion 4g protrudes from the protruding portion 4f toward the disc rotor 2, so there is no risk of the convex portion 4g interfering with components around the caliper body. Furthermore, by providing the lining attachment portion 4d on one side surface 4b of the back plate 4a and providing the convex portion 4g on one side surface 4b of the protruding portion 4f, there is no risk of the protruding portion 4f and the convex portion 4g affecting the attachment process when attaching the lining 4c to the back plate 4a.

[0022] Furthermore, by forming the first caliper protrusion 3k corresponding to the protrusion 4f and the second caliper protrusion 3n corresponding to the disc radially inner protrusion 4i on the caliper body 3, the surface area of ​​the caliper body 3 can be increased, and braking heat transferred to the caliper body 3 can be efficiently dissipated. Furthermore, by forming the first caliper protrusion 3k in accordance with the protruding position of the protrusion 4f and the second caliper protrusion 3n in accordance with the protruding position of the disc radially inner protrusion 4i, the appearance is improved, and the design of the disc brake 1 can be enhanced.

[0023] In the above embodiment, eight protrusions are provided on the back plate, but the number of protrusions is arbitrary. Furthermore, the protrusions are not limited to those provided on both the disc entrance side and the disc exit side of the back plate, and may be provided only on either the disc entrance side or the disc exit side.

[0024] 8 to 15 show other embodiments of the present invention, and the same components as those in the first embodiment are denoted by the same reference numerals, and detailed description thereof will be omitted.

[0025] 8 to 11 show a friction pad 11 for a disc brake according to a second embodiment of the present invention. The friction pad 11 has a pair of protrusions 11a, 11a that protrude radially outward from the disc on the disc entry side and disc exit side of the end face 4e of the back plate 4a, and are formed integrally with the back plate 4a. The protrusion 11a on the disc entry side is inserted into the first ceiling opening 3f, and the protrusion 11a on the disc exit side is inserted into the second ceiling opening 3g.

[0026] Each protrusion 11a has four projections 11b formed integrally with it on one side surface 4b thereof, which project toward the disk rotor 2. The projections 11b extend in the radial direction of the disk, and grooves 11c are provided between adjacent projections 11b in the radial direction of the disk.

[0027] In the above-described embodiment, the protrusions are provided on both the disc entry side and the disc exit side of the back plate, but it is also possible to provide the protrusions on only one of the disc entry side or the disc exit side. The number of convex portions provided on the protrusions is arbitrary, and for example, it is also possible to provide one convex portion having a length in the disc circumferential direction that is approximately the same as the length of the protrusion in the disc circumferential direction.

[0028] 12 to 15 show a disc brake 21 according to a third embodiment of the present invention. The disc brake 21 includes a pair of friction pads 22 and 23 on both sides of the disc rotor 2.

[0029] One of the friction pads 22 has a lining 4c attached to one side surface 4b of a back plate 4a. Furthermore, six protrusions 22a protruding outward in the radial direction of the disk are formed integrally with the back plate 4a on an end surface 4e adjacent to the side surface 4b on the outer side in the radial direction of the disk.

[0030] Three protrusions 22a are formed on the disc entrance side of the back plate 4a, and three on the disc exit side, and the three protrusions 22a on the disc entrance side are inserted into the first ceiling opening 3f, and the three protrusions 22a on the disc exit side are inserted into the second ceiling opening 3g. Also, on one side 4b of each protrusion 22a, a convex portion 22b that protrudes toward the disc rotor 2 is formed integrally with the protrusion 22a.

[0031] Like the first friction pad 22, the other friction pad 23 also has a lining attached to one side of the back plate, and further, six protrusions 23a that protrude radially outward from the disk are formed integrally with the back plate on the end face adjacent to the one side in the radial direction of the disk.

[0032] Similar to the protrusions 22a of one of the friction pads, three protrusions 23a are formed on the disc entry side of the back plate and three on the disc exit side, and the three protrusions 23a on the disc entry side are inserted into the first ceiling opening 3f, and the three protrusions 23a on the disc exit side are inserted into the second ceiling opening 3g. Furthermore, on one side of each protrusion 23a, a convex portion 23b that protrudes toward the disc rotor 2 is formed integrally with the protrusion 23a.

[0033] As shown in Figures 13 to 15, the convex portions 22b, 23b of both friction pads 22, 23 are formed so that when the friction pads 22, 23 are assembled to the caliper body 3, the protruding portion 22a (convex portion 22b) of one friction pad 22 and the protruding portion 23a (convex portion 23b) of the other friction pad 23 are arranged alternately in the circumferential direction of the disc rotor 2.

[0034] 15, even if the friction pads 22, 23 approach each other toward the disc rotor 2 during operation of the disc brake 21, there is no risk of interference between the opposing protrusions 22b, 23b. This allows the length of the protrusions 22b, 23b in the disc axial direction (thickness direction of the friction pad) to be increased, thereby improving the cooling effect.

[0035] The disc brake of the present invention is not limited to the above-described embodiments, and the number of ceiling openings formed in the caliper body may be any number, and the protrusions may be formed appropriately according to the positions of the ceiling openings. Furthermore, the caliper body is not limited to a monocoque structure, and may be a divided structure.

[0036] Furthermore, the protruding portion of the friction pad of the present invention may have a protruding portion protruding toward the disc rotor side as well as a protruding portion protruding away from the disc rotor. The friction pad may not have a protruding portion protruding inward in the disc radial direction, and the protruding portion or protruding portion may not be formed integrally with the backing plate. The friction pad of the present invention is not limited to a friction pad in which the lining is attached to the backing plate, but may also be a friction pad in which the lining is sintered to the backing plate. The friction pad may also be a friction pad in which the friction portion and the backing plate are formed integrally using a carbon material or the like, instead of a sintered material or a resin material.

[0037] DESCRIPTION OF SYMBOLS 1...Disc brake, 2...Disc rotor, 3...Caliper body, 3a, 3b...Action portion, 3c...Disc rotation-in side bridge portion, 3d...Disc rotation-out side bridge portion, 3e...Intermediate bridge portion, 3f...First ceiling opening, 3g...Second ceiling opening, 3h...Cylinder hole, 3i...Mounting boss portion, 3j...Mounting bolt insertion hole, 3k...First caliper protrusion portion, 3m...Radially inner portion of disc, 3n...Second caliper protrusion portion, 4...Friction pad, 4a...Back plate, 4b...One side surface , 4c... lining (friction portion), 4d... lining mounting portion, 4e... end surface, 4f... protrusion, 4g... convex portion, 4h... end surface, 4i... disc radially inward protrusion, 5... piston, 6... friction pad accommodating portion, 6a... rotation-in side torque receiving surface, 6b... rotation-out side torque receiving surface, 6c... pad support portion, 11... friction pad, 11a... protrusion, 11b... convex portion, 11c... groove portion, 21... disc brake, 22, 23... friction pad, 22a, 23a... protrusion, 22b, 23b... convex portion

Claims

1. A disc brake comprising a caliper body with a ceiling opening in a bridge section that straddles the outer periphery of a disc rotor, and a pair of friction pads that are arranged on either side of the disc rotor with the disc rotor in between, the friction pads having protrusions on back plates that are provided with friction sections and that are inserted into the ceiling opening, wherein the protrusions have a convex portion that protrudes at least toward the disc rotor.

2. A disc brake according to claim 1, characterized in that a plurality of said protrusions are provided.

3. A disc brake according to claim 1, characterized in that a plurality of said projections are provided.

4. A disc brake as described in claim 3, characterized in that the convex portions formed on the pair of friction pads each protrude toward the disc rotor, and the convex portions of one friction pad and the convex portions of the other friction pad are arranged alternately in the circumferential direction of the disc rotor.

5. A disc brake according to claim 1, wherein the back plate of the friction pad is formed with a disc radially inward protrusion that protrudes radially inward from the disc.

6. A disc brake according to any one of claims 1 to 5, characterized in that the caliper body is formed with a caliper protrusion that protrudes outward from the caliper body in accordance with the protruding position of the protrusion.

7. A friction pad for a disc brake, wherein a friction portion is provided on one side of a backing plate, the backing plate having a protruding portion that protrudes in one direction from an end face adjacent to the one side, and the protruding portion has a convex portion that protrudes in the thickness direction of the friction pad on at least one side.

8. A friction pad for a disc brake according to claim 7, characterized in that a plurality of said protrusions are provided.

9. A friction pad for a disc brake according to claim 7 or 8, characterized in that a plurality of said protrusions are provided.

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