JP2021139437A - Vehicular disk brake - Google Patents

Abstract

To provide a vehicular disk brake that can dissipate brake heat transmitted to a caliper body, a friction pad and a piston to the outside with a simple structure.SOLUTION: A vehicular disk brake includes a heat pipe 11 (cooling structure) mounted to a disk turn-out side on a side of an action part and a disk turn-out side on a side of a reaction part of a caliper body 6 toward the disk turn-out side from a disk turn-in side. The heat pipe 11 is provided with a heat absorption part 11a and a heat dissipation part 11b on one side and the other side thereof respectively. The heat absorption part 11a is mounted on an inside of the caliper body 6, while the heat dissipation part 11b is mounted while projecting outside from the caliper body 6.SELECTED DRAWING: Figure 1

Description

The present invention relates to a vehicle disc brake, and more particularly to a vehicle disc brake having a structure for dissipating braking heat transmitted to a caliper body, a friction pad, and a piston to the outside air.

Conventionally, in vehicle disc brakes, the caliper body becomes hot due to the braking heat generated by the sliding contact between the friction pad lining and the disc rotor during braking, so the caliper body is arranged on the outer peripheral side of the disc rotor. A heat absorbing part that absorbs braking heat is provided inside the bridge part, and a heat radiating part is provided on the outer surface of the bridge part, and the heat absorbing part and the radiating part are communicated with each other through a passage filled with a heat medium to cool the caliper body. (See, for example, Patent Document 1).

Japanese Unexamined Patent Publication No. 60-69335

However, in the above-mentioned Patent Document 1, the cost is high because the structure is complicated. Moreover, although the caliper body could be cooled, the friction pad and the piston could not be cooled.

Therefore, an object of the present invention is to provide a vehicle disc brake capable of releasing braking heat transmitted to a caliper body, a friction pad, and a piston to the outside with a simple structure.

In order to achieve the above object, the vehicle disc brake of the present invention includes a caliper body arranged so as to straddle the outer periphery of the disc rotor, friction pads arranged on both sides of the disc rotor, and a cylinder formed on the caliper body. In a vehicle disc brake provided with a piston that is inserted into a hole and pushes the friction pad toward a side surface of the disc rotor, one end of the caliper body, the friction pad, and at least one of the pistons. A cooling structure having a heat absorbing portion on the side and a heat radiating portion on the other end side, the heat absorbing portion inside at least one of the caliper body, the friction pad, and the piston, and the heat radiating portion from the caliper body. The feature is that it is provided in a state of being projected to the outside.

Further, in the cooling structure, it is preferable that the endothermic portions are arranged on one side or both sides of the caliper body with the disc rotor sandwiched between them.

Further, in the cooling structure, it is preferable that the endothermic portion is arranged toward the cylinder hole of the caliper body.

Further, in the cooling structure, it is preferable that the heat absorbing portion is arranged on the tip surface of the piston.

Further, the cooling structure may be arranged on the back plate of the friction pad.

Further, the caliper body is provided with a hanger pin mounting boss portion for mounting the hanger pin for suspending the friction pad, and the cooling structure is provided from the disk inner peripheral side of the hanger pin mounting boss portion toward the cylinder hole. The heat absorbing portion may be arranged on the cylinder hole side.

Further, the caliper body is arranged on one side of the disc rotor and has a cylinder hole, a reaction portion which is arranged on the other side of the disc rotor and has a reaction force claw, and the reaction portion. A bridge portion for connecting the action portion and the reaction portion across the outer periphery of the disc rotor is provided, and the cooling structure is provided from the outside of the reaction portion in the disc radial direction toward the tip of the reaction force claw. , The heat absorbing portion may be arranged on the tip end side of the reaction force claw.

Further, the cooling structure is preferably a heat pipe, and further, the heat pipe is preferably screw-fixed or caulked-fixed to the caliper body.

Further, the cooling structure is formed by enclosing a heat medium in a cooling hole opened on the outer surface of the caliper body and closing the opening with a lid member, and the cooling hole is used as a heat absorbing portion and the lid member is used as a heat radiating portion. Is suitable.

According to the vehicle disc brake of the present invention, the braking heat transmitted to the caliper body, the friction pad, and the piston can be released to the outside with a simple structure only provided with a cooling structure.

Further, by arranging the heat absorbing portions of the cooling structure on one side or both sides of the disc rotor of the caliper body, the transmitted braking heat can be satisfactorily released to the outside from the caliper body.

Furthermore, by arranging the endothermic part of the cooling structure on the caliper body toward the cylinder hole, on the tip surface of the piston, or on the back plate of the friction pad, the heat is transferred to a high temperature. Further, the braking heat can be satisfactorily released to the outside from a position where the hydraulic fluid is likely to be affected, and the hydraulic fluid can be prevented from becoming hot.

Further, since the cooling structure is a heat pipe, the cooling structure can be easily attached, and further, the heat pipe can be attached more easily by screwing or caulking the heat pipe to the caliper body. can.

Further, the cooling structure is formed by enclosing a heat medium in a cooling hole that opens on the outer surface of the caliper body and closing the opening with a lid member, and by using the cooling hole as a heat absorbing part and the lid member as a heat radiating part. A heat absorbing portion can be provided near the heat source, and the caliper body can be cooled efficiently. Further, since the heat absorbing portion can be provided on the caliper body itself, the weight can be reduced.

It is a front view of the disc brake for a vehicle which shows the 1st Embodiment example of this invention. FIG. 2 is a cross-sectional view taken along the line II-II of FIG. FIG. 3 is a cross-sectional view taken along the line III-III of FIG. It is a side view of the disc brake for a vehicle which shows the 1st Embodiment example of this invention. It is a VV cross-sectional view of FIG. It is a front view of the disc brake for a vehicle which shows the 2nd Embodiment example of this invention. It is also a side view of a vehicle disc brake. FIG. 7 is a cross-sectional view taken along the line VIII-VIII of FIG. FIG. 7 is a cross-sectional view taken along the line IX-IX of FIG. It is a front view of the disc brake for a vehicle which shows the 3rd Embodiment example of this invention. FIG. 10 is a cross-sectional view taken along the line XI-XI of FIG. It is sectional drawing of the main part of the disc brake for a vehicle which shows the example of 4th Embodiment of this invention.

1 to 5 are views showing an example of a first embodiment of a vehicle disc brake of the present invention. The arrow A indicates the rotation direction of the disc rotor that rotates integrally with the wheels when the vehicle is moving forward, and the disc feeding side and the disc turning side described below are defined as when the vehicle is moving forward.

The vehicle disc brake 1 includes a disc rotor 2 that rotates integrally with a vehicle (not shown) when the vehicle is running, a caliper bracket 3 attached to the vehicle body on one side of the disc rotor 2, and a slide pin 4 on the caliper bracket 3. The disc rotor 2 is sandwiched between the pin slide type caliper body 6 slidably supported in the disc axial direction via the caliper bodies 6 and the acting portion 6a and the reaction portion 6b of the caliper body 6 so as to face each other. It includes a pair of friction pads 7 and 7.

The caliper bracket 3 includes an axle mounting portion 3b having a through hole 3a through which an axle is inserted, a turn-in side caliper support arm 3c extending from the axle mounting portion 3b toward the outer periphery of the disc rotor 2, and the turning-in portion. It has a feeding side caliper supporting arm 3d extending to the feeding side with respect to the side caliper supporting arm 3c. The accommodating recesses 3e of the friction pads 7 and 7 are provided between the entry-side caliper support arm 3c and the exit-side caliper support arm 3d. A U-shaped pad guide groove 3f is provided, and a torque receiving surface 3g is provided on the disc feeding side of the pad guide groove 3f. Further, a caliper support arm 3h straddling the outer circumference of the disc rotor 2 is projected in the disc axial direction on the tip side of the caliper support arm 3d on the rotation side, and a bag-shaped slide pin insertion hole 3i is provided in the caliper support arm 3h. A slide pin mounting portion 3j is formed at the tip of the turning-in side caliper support arm 3c.

The caliper body 6 is composed of the above-mentioned acting portions 6a and reaction portions 6b arranged on both side portions of the disc rotor 2 and bridge portions 6c connecting them across the outer circumference of the disc rotor 2. The working portion 6a is provided with a bottomed cylinder hole 6d having an opening on the disc rotor 2 side, and the reaction portion 6b is integrally formed with reaction force claws 6e and 6e. A piston 8 is liquid-tightly inserted into the cylinder hole 6d, and a hydraulic chamber 9 is defined between the piston 8 and the bottom of the cylinder hole 6d. Slide pin mounting arms 6f and 6f for mounting slide pins 4 and 5 are projected from the working portion 6a toward the disc feeding side and the disc inner peripheral side, and the disc turning side of the working portion 6a and the reaction portion 6b. 6g and 6g of hanger pin mounting boss portions for mounting the hanger pin 10 are provided so as to project from the hanger pin mounting boss portion 6g and 6g.

The caliper body 6 projects the slide pin 4 toward the disc rotor 2 on the slide pin mounting arm 6f on the disc feeding side, inserts the slide pin 4 into the slide pin insertion hole 3i of the caliper bracket 3, and inserts the slide pin 4 into the slide pin insertion hole 3i of the caliper bracket 3. By projecting the slide pin 5 into the slide pin mounting portion 3j of the caliper bracket 3 toward the anti-disc rotor side and inserting the slide pin 5 into the slide pin mounting arm 6f on the inner peripheral side of the disc of the caliper body 6. It is supported so that it can be moved in the direction of the disc axis. Further, a heat pipe 11 (cooling structure) is inserted into the disc feeding side of the caliper body 6 on the acting portion side and the disc feeding side of the reaction portion side from the disc feeding side to the disc feeding side. Each of the heat pipe mounting holes 6h is formed, and a large-diameter female screw portion 6i is formed in the opening of each heat pipe mounting hole 6h.

The heat pipe 11 has a well-known cooling structure. For example, the heat pipe 11 is provided with a wick having a capillary action in a pipe made of a metal having high thermal conductivity, and a working liquid is sealed in the pipe and sealed under reduced pressure. .. More specifically, a metal mesh, a wick formed of a wire and a spiral spring, or the like is provided on the inner wall of the pipe with both ends closed, and a heat absorbing portion 11a is provided on one end side and a heat radiating portion 11b is provided on the other end side. There is. In the heat pipe 11, the hydraulic fluid boils and evaporates due to the heat transferred to the endothermic portion 11a provided on one end side, and the steam flows from the endothermic portion 11a to the heat dissipation portion 11b provided on the other end side due to the pressure difference. The heat of condensation is released from the heat radiating unit 11b by condensing the steam that flows and reaches the heat radiating unit 11b, and the condensed hydraulic fluid is returned to the endothermic portion 11a again due to the capillary phenomenon of the wick, and the hydraulic fluid is returned to the heat absorbing portion 11a as described above. Cooling is performed by repeating evaporation, condensation, and recirculation.

Each heat pipe 11 is longer than the heat pipe mounting hole 6h and is formed so as to be inserted into the heat pipe mounting hole 6h, and a male screw member 11c screwed into the female screw portion 6i is attached to the axial intermediate portion. ing. Each heat pipe 11 is inserted into the heat pipe mounting hole 6h from the heat absorbing portion side, and is attached to the caliper body 6 by screwing the male screw member 11c into the female screw portion 6i, and the heat radiating portion 11b is outward from the caliper body 6. Protruding to.

Each friction pad 7 is configured by joining a lining 7a that is in sliding contact with the side surface of the disc rotor 2 to a metal back plate 7b. On the back plate 7b, a hanging piece 7c having a hanger pin insertion hole is projected on the disc insertion side, and an ear piece 7d supported by the pad guide groove 3f of the caliper bracket 3 is projected on the disk ejection side. Will be done. For each friction pad 7, the hanger pin 10 is bridged between the hanger pin mounting boss portions 6g and 6g of the hanger pin 10 formed on the caliper body 6 and the hanger pin insertion hole formed in the hanging piece 7c, and the ear piece 7d is attached. By supporting the caliper bracket 3 in the pad guide groove 3f, the caliper bracket 3 is arranged so as to be movable in the disc axial direction.

In the vehicle disc brake 1 thus formed, when the hydraulic fluid boosted by a separate hydraulic master cylinder is supplied to the hydraulic chamber 9 during braking, the piston 8 moves to the disc rotor 2 side. The friction pad 7 on the working part side is urged to one side surface of the disc rotor 2. Next, due to this reaction, the caliper body 6 moves to the action part side while being guided by the slide pins 4 and 5, and the reaction force claws 6e and 6e of the reaction part 6b move the friction pad 7 on the reaction part 6b side to the disc rotor 2. Braking action is performed by pressing against the other side surface.

During braking, the braking heat generated by the sliding contact between the disc rotor 2 and the friction pads 7 and 7 is transmitted to the caliper body 6, but the disc feeding side on the acting part side of the caliper body 6 and the reaction part side Since the heat pipes 11 and 11 are mounted on the disc feeding side, the braking heat transmitted to the heat absorbing portions 11a and 11a of the heat pipes 11 and 11 is dissipated from the heat radiating portion 11b arranged outside the caliper body 6. , 11b is released to the outside, and it is possible to prevent the caliper body 6 from becoming hot.

Further, by using the heat pipe 11 as the cooling structure, it becomes easy to attach the cooling structure, and further, by fixing the heat pipe 11 to the caliper body 6 with screws, the heat pipe 11 can be attached more easily. be able to.

6 to 12 show other embodiments of the present invention, and the same reference numerals are given to those showing the same components as those of the first embodiment, and detailed description thereof will be omitted. ..

6 to 9 show an example of the second embodiment of the present invention, in which the heat pipe mounting hole is directed from the inner peripheral side of the disk of the hanger pin mounting boss portion 6g of the working portion 6a of the caliper body 6 toward the cylinder hole 6d. 6j is formed, and a female screw portion 6k is formed in the opening of the heat pipe mounting hole 6j. The heat pipe 12 mounted in the heat pipe mounting hole 6j is longer than the heat pipe mounting hole 6j and is formed so as to be inserted into the heat pipe mounting hole 6j, and heat is generated from the heat absorbing portion 12a provided on the tip side. By screwing the male screw member 12b inserted into the pipe mounting hole 6j and provided in the axial intermediate portion of the heat pipe 12 into the female screw portion 6k, the heat radiating portion 12c provided at the base end portion protrudes to the outside.

Further, heat pipe mounting holes 6m and 6m are formed from the outside of the reaction portion 6b of the caliper body 6 in the radial direction of the disk toward the tips of the reaction force claws 6e and 6e, and the openings of the heat pipe mounting holes 6m and 6m are formed. Each of the large-diameter holes 6n formed to have a diameter larger than the inner diameter of the heat pipe mounting hole 6m is formed. The heat pipe 13 mounted in each heat pipe mounting hole 6 m is longer than the heat pipe mounting hole 6 m, is formed so as to be inserted into the heat pipe mounting hole 6 m, and protrudes from the heat pipe mounting hole 6 m. The base end side is bent at a substantially right angle. Each heat pipe 13 is inserted into the heat pipe mounting hole 6m from the heat absorbing portion 13a provided on the tip side, and the large diameter member 13b provided in the axial intermediate portion of the heat pipe 13 is press-fitted into the large diameter hole 6n. The base end side is caulked and fixed in a state of facing the bridge portion side, and the heat radiating portion 13c provided at the base end portion projects outward from the caliper body 6.

Since this embodiment is formed as described above, the heat pipe 12 provided in the working portion 6a tends to cause the caliper body 6 to become hot due to the transmitted braking heat, which further affects the hydraulic fluid. Braking heat can be satisfactorily released to the outside from a position near the easy cylinder hole 6d. Further, the heat pipes 13 and 13 provided in the reaction portion 6b can satisfactorily release the braking heat transmitted to the reaction force claws 6e and 6e to the outside, and further, the base end side is folded toward the bridge portion side. Since it is bent, it is possible to prevent the base end sides of the heat pipes 13 and 13 from protruding significantly from the caliper body 6. Further, the heat pipes 12, 13 and 13 can be easily attached to the caliper body 6 by screw-fixing the heat pipe 12 to the caliper body 6 and caulking the heat pipes 13 and 13 to the caliper body 6.

10 and 11 show a third embodiment of the present invention, in which plate-shaped heat pipes 14, 15 and 15 are attached to the tip surface of the piston 8 and the back surface of the back plate 7b of the friction pad 7, respectively. Has been done. Each of the heat pipes 14, 15 and 15 has a structure similar to that of a round heat pipe, and is provided with heat absorbing portions 14a, 15a and 15a on the tip side and heat radiating portions 14b, 15b and 15b on the base end side, respectively. Has been done.

In the heat pipe 14 attached to the tip surface of the piston 8, the heat absorbing portion 14a provided at the tip portion is attached to the disc feeding side of the piston 8, and the heat radiating portion 14b provided at the base end portion is attached to the disc rotating side of the piston 8. It is projected to the entrance side, and the heat radiating portion 14b protrudes outward from the caliper body 6. Further, in the heat pipes 15 and 15 attached to the back plate 7b of the friction pad 7, the heat absorbing portions 15a and 15a provided at the tip end are attached to the disc feeding side of the back plate 7b, and heat dissipation provided at the base end portion. The portions 15b and 15b are projected from the disc turning side end of the back plate 7b toward the disc turning side, and the heat radiating portion 15b on the reaction portion side is projected outward from the caliper body 6.

By forming the example of this embodiment as described above, the braking heat can be satisfactorily released to the outside from the piston 8 and the friction pads 7 and 7, which tend to become high heat due to the braking heat, and the hydraulic fluid becomes hot. Can be prevented.

FIG. 12 shows a fourth embodiment of the present invention. The cooling structure of the present embodiment includes a cooling hole 16 that opens on the outer surface of the caliper body 6 and a wick that is sealed in the cooling hole 16 and sealed under reduced pressure. A 17 and a hydraulic fluid 18 (heat medium) and a lid member 19 for closing the opening of the cooling hole 16 are provided, and the cooling hole 16 is a heat absorbing portion and the lid member 19 is a heat radiating portion.

By forming the example of this embodiment as described above, a heat absorbing portion can be provided near the heat source, and the caliper body 6 can be efficiently cooled. Further, since the heat absorbing portion can be provided on the caliper body itself, the weight can be reduced.

The present invention is not limited to the pin slide type disc brake as in each of the above-described examples, but can also be applied to a piston-opposed disc brake, and the number of pistons is arbitrary. Moreover, the place where the heat pipe is attached is arbitrary.

1 ... Vehicle disc brake, 2 ... Disc rotor, 3 ... Caliper bracket, 3a ... Through hole, 3b ... Axle mounting part, 3c ... Entering side caliper support arm, 3d ... Exiting side caliper support arm, 3e ... Accommodating recess , 3f ... Pad guide groove, 3g ... Torque receiving surface, 3h ... Caliper support arm, 3i ... Slide pin insertion hole, 3j ... Slide pin mounting part, 4, 5 ... Slide pin, 6 ... Caliper body, 6a ... Acting part, 6b ... Reaction part, 6c ... Bridge part, 6d ... Cylinder hole, 6e ... Reaction force claw, 6f ... Slide pin mounting arm, 6g ... Hanger pin mounting boss part, 6h ... Heat pipe mounting hole, 6i ... Female thread part, 6j ... Heat pipe mounting hole, 6k ... Female thread, 6m ... Heat pipe mounting hole, 6n ... Large diameter hole, 7 ... Friction pad, 7a ... Lining, 7b ... Back plate, 7c ... Hanging piece, 7d ... Ear piece, 8 ... Piston, 9 ... Hydraulic chamber, 10 ... Hanger pin, 11 ... Heat pipe, 11a ... Heat absorbing part, 11b ... Heat dissipation part, 11c ... Male screw member, 12 ... Heat pipe, 12a ... Heat absorbing part, 12b ... Male screw member, 12c ... Heat radiating part, 13 ... heat pipe, 13a ... heat absorbing part, 13b ... large diameter member, 13c ... radiating part, 14, 15 ... heat pipe, 14a, 15a ... heat absorbing part, 14b, 15b ... radiating part, 16 ... cooling hole, 17 ... Wick, 18 ... Hydraulic fluid, 19 ... Lid member

Claims (10)

The caliper body is arranged so as to straddle the outer periphery of the disc rotor, the friction pads are arranged on both sides of the disc rotor, and the friction pads are inserted into the cylinder holes formed in the caliper body so that the friction pads are directed toward the side surfaces of the disc rotor. In a vehicle disc brake equipped with a piston that pushes
At least one of the caliper body, the friction pad, and the piston has a cooling structure having a heat absorbing portion on one end side and a heat radiating portion on the other end side. A vehicle disc brake characterized in that the heat radiating portion is provided inside at least one of the pistons in a state of protruding outward from the caliper body. The vehicle disc brake according to claim 1, wherein the cooling structure is arranged on one side or both sides of the caliper body with the disc rotor interposed therebetween. The vehicle disc brake according to claim 2, wherein the cooling structure is arranged with the endothermic portion directed toward the cylinder hole of the caliper body. The vehicle disc brake according to claim 2, wherein the cooling structure has the endothermic portion arranged on the tip end surface of the piston. The vehicle disc brake according to claim 2, wherein the cooling structure is arranged on the back plate of the friction pad. The caliper body includes a hanger pin mounting boss portion for mounting the hanger pin for suspending the friction pad, and the cooling structure is provided from the inner peripheral side of the disk of the hanger pin mounting boss portion toward the cylinder hole. The vehicle disc brake according to claim 2, wherein the heat absorbing portion is arranged on the cylinder hole side. The caliper body is arranged on one side of the disc rotor and has an action portion having a cylinder hole, and a reaction portion arranged on the other side of the disc rotor and having a reaction force claw, and the action portion. The reaction portion is provided with a bridge portion that connects the reaction portion and the reaction portion across the outer periphery of the disc rotor, and the cooling structure is provided from the outside of the reaction portion in the disc radial direction toward the tip of the reaction force claw. The vehicle disc brake according to claim 2, wherein the heat absorbing portion is arranged on the tip end side of the reaction force claw. The vehicle disc brake according to any one of claims 1 to 7, wherein the cooling structure is a heat pipe. The vehicle disc brake according to claim 8, wherein the heat pipe is screwed or caulked to the caliper body. The cooling structure is formed by enclosing a heat medium in a cooling hole that opens on the outer surface of the caliper body and closing the opening with a lid member, with the cooling hole as a heat absorbing portion and the lid member as a heat radiating portion. The vehicle disc brake according to any one of claims 1 to 3, wherein the disc brake is characterized in that.

Images