Invention name: Vehicle disc brake
Technical field
[0001]
The present invention relates to a vehicle disc brake, and more particularly to a vehicle disc brake having a structure for dissipating braking heat to the outside air.
Background technology
[0002]
Conventionally, in vehicle disc brakes, in order to prevent the temperature of the working fluid from rising due to the braking heat generated by the sliding contact between the friction pad lining and the disc rotor during braking, between the back plate and the lining. A middle plate is arranged and braking heat is released through a minute gap provided in the overlapping portion between the back plate and the middle plate (see, for example, Patent Document 1), or a back plate and a shim plate. In some cases, an insulator having a heat insulating effect is arranged between the brake and the brake to prevent braking heat from being transmitted to the piston (see, for example, Patent Document 2).
[0003]
Further, in a vehicle disc brake equipped with a split type caliper body in which a caliper half body formed by being divided into two parts from a bridge portion straddling the outer circumference of the disc rotor is connected by a fastening bolt, the divided surface of the caliper half body divided into two parts is used. A spacer provided with a vent is interposed, and the running wind is supplied to the sliding contact portion between the disc rotor and the friction pad through the ventilation hole, and the braking heat generated by the sliding contact between the disc rotor and the friction pad is generated. Some were released to the outside air to prevent the temperature of the working fluid from rising (see, for example, Patent Documents 3 and 4).
Prior art literature
Patent documents
[0004]
Patent Document 1: Japanese Square Root Extraction No. 5-94541
Patent Document 2: Japanese Patent No. 4250117
Patent Document 3: Jikken 6-50668
Patent Document 4: Patent No. 4318575
SUMMARY OF THE INVENTION
Problems to be solved by the invention
[0005]
In recent years, the braking energy has increased with the improvement of vehicle performance, so there is a tendency to thicken the lining of the friction pad. However, in the above-mentioned Patent Document 1, since the middle plate is attached to the back plate, it is difficult to increase the thickness of the lining due to the thickness of the back plate and the middle plate. Further, in Patent Document 2, since the insulator and the shim plate are formed of a thin plate, the thickness of the lining can be easily secured, but the insulator and the shim plate are interposed between the piston and the back plate. As a result, there is a risk that the brake feeling will deteriorate.
[0006]
Further, in the above-mentioned Patent Document 3, there is a possibility that the number of parts increases and the weight of the caliper body increases. Further, in Patent Document 4, there is a possibility that the traveling wind passing through the ventilation space formed between the back plate of the friction pad and the attached piston does not escape from the bridge portion of the caliper body to the outside. there were.
[0007]
Therefore, the present invention provides a vehicle disc brake capable of satisfactorily releasing the braking heat generated by the sliding contact between the lining and the disc rotor while ensuring the thickness of the lining and maintaining a good brake feeling. The purpose is to provide. Furthermore, in the case of vehicle disc brakes equipped with a split type caliper body, while reducing the weight of the caliper body, the running wind is formed in the ventilation space formed between the back plate of the friction pad and the attached piston. The purpose is to release the braking heat generated by the sliding contact between the disc rotor and the friction pad to the outside air.
Means to solve problems
[0008]
In order to achieve the above object, the vehicle disc brake of the present invention has a pair of working portions provided with cylinder holes for accommodating pistons, which are arranged so as to face each other with the disc rotor interposed therebetween, straddling the outer periphery of the disc rotor and opening the ceiling. A caliper body formed by connecting with a bridge portion provided with the above, an inner friction pad arranged inside the vehicle body with the disc rotor sandwiched between the two, and an outer friction pad arranged outside the vehicle body. The outer friction pad is a vehicle disc brake formed by attaching a lining to a metal back plate, and is characterized in that the back plate is provided with a heat radiating piece to be inserted into the ceiling opening.
[0009]
Further, it is preferable that the heat radiating piece of the inner friction pad has a length such that the outer surface in the radial direction of the disk is arranged in the ceiling opening and fits inside the outer surface in the radial direction of the disk of the bridge portion.
[0010]
Further, it is preferable that the heat radiating piece of the outer friction pad is formed so that the outer surface in the radial direction of the disk protrudes outward in the radial direction of the disk from the ceiling opening.
[0011]
Further, it is preferable that a plurality of the ceiling openings are formed in the circumferential direction of the disk of the bridge portion, and a plurality of the heat radiation pieces are formed according to the ceiling openings.
[0012]
Further, the outer surface of the heat radiation piece in the radial direction of the disc is formed in a shape that follows the shape of the outer surface of the bridge portion in the radial direction of the disc in a state where the inner friction pad and the outer friction pad are assembled to the caliper body. It is good.
[0013]
Further, it is preferable that the heat radiation piece has a chamfered portion formed therein.
[0014]
Further, the pair of the working portions are provided with a plurality of the cylinder holes in the circumferential direction of the disc, and the bridge portion includes a disc turning side bridge portion formed on the disc turning side when the vehicle is moving forward and the vehicle moving forward. It has a disk feeding side bridge portion formed on the disk feeding side at the time, an intermediate bridge portion formed between the disk feeding side bridge portion and the disk feeding side bridge portion, and the intermediate bridge portion. The ceiling opening is provided between the bridge portion and the disk entry side bridge portion, and between the intermediate bridge portion and the disk exit side bridge portion, and at least one of the action portions of the action portion. It is preferable to form ventilation holes that open on the outer surface in the radial direction of the disc and the side surface of the disc rotor on the extension line of the intermediate bridge portion.
[0015]
Further, a ventilation space portion is provided between the piston housed in each of the cylinder holes provided therein, the back plate, and the side surface of the disc rotor of the action portion, and the ventilation hole communicates with the ventilation space portion. good.
[0016]
Further, it is preferable to form a ventilation groove extending from the inner end portion in the radial direction of the disk to the ventilation hole on the side surface of the disk rotor of the action portion.
[0017]
It is preferable that the ventilation holes are formed at an obtuse angle with respect to the side surface of the disc rotor from the outer surface of the working portion in the radial direction of the disc toward the side surface of the disc rotor.
[0018]
It is preferable that the ventilation holes are formed in each of the pair of the working portions.
[0019]
It is preferable that the ventilation hole formed in the action portion arranged inside the vehicle body has a diameter larger than that of the ventilation hole formed in the action portion arranged outside the vehicle body.
[0020]
It is preferable that the caliper body is attached to the vehicle body with the inside in the radial direction of the disc facing the front of the vehicle body.
Effect of the invention
[0021]
According to the vehicle disc brake of the present invention, since the heat radiating piece formed on the back plate through the ceiling opening comes into contact with the outside air, the braking heat can be satisfactorily released to the outside air. Further, by forming the heat radiating piece, the volume of the back plate can be increased without increasing the thickness of the back plate as compared with the conventional friction pad not provided with the heat radiating piece, and the braking heat is absorbed. It is possible to secure the heat capacity of.
[0022]
Further, the heat radiating piece of the inner friction pad is formed to have a length in which the outer surface in the radial direction of the disk is arranged in the ceiling opening, so that when the caliper body to which the friction pad is assembled is attached to the vehicle body, the inner friction pad is formed. There is no risk that the heat radiating piece will interfere with members on the vehicle body side such as wheels.
[0023]
Further, the heat radiating piece of the outer friction pad is formed so that the outer surface in the radial direction of the disk protrudes outward in the radial direction of the disk from the ceiling opening, thereby increasing the surface area of ​​the heat radiating piece and improving the heat dissipation. Can be planned. Further, the volume of the back plate can be further increased without increasing the thickness of the back plate, and the heat capacity for absorbing the braking heat can be secured.
[0024]
Further, by forming a plurality of ceiling openings in the circumferential direction of the disk of the bridge portion and forming a plurality of heat radiation pieces according to the ceiling openings, it is possible to further improve the heat dissipation. Further, the volume of the back plate can be satisfactorily increased without increasing the thickness of the back plate, and the heat capacity for absorbing the braking heat can be secured.
[0025]
Further, the friction pad can be attached / detached by forming the outer surface of the heat radiation piece in the radial direction of the disk in a shape that follows the shape of the outer surface in the radial direction of the disk of the bridge portion in a state where the inner friction pad and the outer friction pad are assembled. It is possible to improve heat dissipation while maintaining good properties, and it is possible to obtain a neat appearance with the friction pad attached to the caliper body.
[0026]
Further, by forming the chamfered portion on the heat radiating piece, the surface area of ​​the heat radiating piece can be increased to improve the heat radiating property, and the assembling property of the friction pad can be improved.
[0027]
Further, the pair of action portions are provided with a plurality of cylinder holes in the circumferential direction of the disc, and the bridge portion has a disc entry side bridge portion, a disc exit side bridge portion, and an intermediate bridge portion, and an intermediate bridge portion. Ceiling openings are provided between the and the disc entry side bridge portion and between the intermediate bridge portion and the disc exit side bridge portion, respectively, on the extension line of the intermediate bridge portion of at least one of the acting portions. By forming ventilation holes that open on the outer surface in the radial direction of the disc and the side surface of the disc rotor, the ventilation holes allow outside air regardless of the structural type of the caliper body, such as a split caliper body or a monocoque caliper body. Can be introduced to cool disc brakes. Further, the braking heat can be released to the outside air through the ventilation holes, and the temperature of the hydraulic fluid can be prevented from rising. In addition, since the stress applied during braking is lower around each working part located on the extension line of the intermediate bridge part than other parts, even if a ventilation hole is formed on the extension line of the intermediate bridge part of the working part. The rigidity of the caliper body can be ensured, and the weight of the caliper body can be reduced.
[0028]
Further, the ventilation space formed between the attached piston, the back plate of the inner friction pad or the back plate of the outer friction pad, and the side surface of the disc rotor of the working portion is communicated with the ventilation hole. The running wind can be introduced into the ventilation space portion to satisfactorily cool the ventilation space portion, and the braking heat of the ventilation space portion can be satisfactorily released to the outside air through the ventilation holes.
[0029]
Further, by forming ventilation grooves extending from the inner end in the radial direction of the disc to the ventilation holes on the side surface of the disk rotor of the working portion, the running wind is satisfactorily introduced into the ventilation space through the ventilation grooves and the ventilation holes. At the same time, the braking heat can be satisfactorily released to the outside air.
[0030]
Further, by forming the ventilation holes at an obtuse angle with respect to the side surface of the disc rotor from the outer surface in the radial direction of the disk of the working portion toward the side surface of the disc rotor, the flow of outside air introduced into the ventilation space portion and the braking heat are formed. It is possible to improve the flow of braking heat that releases the air to the outside air.
[0031]
Further, by forming the ventilation holes in the pair of action portions, the outside air can be introduced into the portion where the friction pad and the disc rotor are in sliding contact with each other to more reliably cool the brakes, and the braking heat can be transferred through the ventilation holes. Therefore, it can be released to the outside air more reliably.
[0032]
Further, by forming the ventilation holes formed in the action portion arranged inside the vehicle body to have a larger diameter than the ventilation holes formed in the action portion arranged outside the vehicle body, the friction inside the vehicle body where the braking heat is easily trapped. The outside air can be satisfactorily introduced into the ventilation space formed between the back plate of the pad and the adjacent piston, and the trapped braking heat can be satisfactorily released to the outside air.
[0033]
Furthermore, the caliper body can more effectively supply the running wind to the ventilation space by attaching the caliper body to the vehicle body with the inside in the radial direction of the disc facing the front of the vehicle body.
A brief description of the drawing
[0034]
FIG. 1 is a front view of a vehicle disc brake showing an example of one embodiment of the present invention.
[figure 2] It is also a plan view of the vehicle disc brake.
[Fig. 3] Fig. 3 is a bottom view of the same vehicle disc brake.
[Fig. 4] Fig. 4 is a side view of the same vehicle disc brake.
5 is a cross-sectional view taken along line V-V of FIG. 4. FIG.
6 is a sectional view taken along line VI-VI of FIG. 4; FIG.
7 is a cross-sectional view taken along line VII-VII of FIG. 1; FIG.
8 is a cross-sectional view taken along line VIII-VIII of FIG. 1; FIG.
Mode for carrying out the invention
[0035]
1 to 8 are diagrams showing one embodiment of the vehicle disc brake of the present invention. The arrow A indicates the direction of rotation of the disk rotor that rotates together with the wheel when the vehicle moves forward. Further, an arrow B indicates the front of the vehicle body.
[0036]
A vehicle disc brake 1 of this embodiment includes a disc rotor 2 that rotates integrally with a wheel, a monocoque piston-facing caliper body 3 that is attached to a vehicle body at one side of the disc rotor 2, and a disc rotor 2. An inner friction pad 4 and an outer friction pad 5 are provided so as to face each other with the disk rotor 2 interposed between the working portions 3a and 3b of the caliper body 3 disposed on both sides.
[0037]
The caliper body 3 is integrally provided with a pair of working portions 3a and 3b and a bridge portion 3c that straddles the pair of working portions 3a and 3b on the disk outer peripheral side. , a disk exit-side bridge portion 3e, and an intermediate bridge portion 3f provided between the disk exit-side bridge portion 3d and the disk exit-side bridge portion 3e. A first ceiling opening portion 3g is formed between the portion 3f and a second ceiling opening portion 3h is formed between the disc exit side bridge portion 3e and the intermediate bridge portion 3f. Each acting portion 3a, 3b is provided with two opposing cylinder holes 3i each accommodating a piston 6, and a hydraulic chamber 7 is defined between each piston 6 and the cylinder hole 3i. ing.
[0038]
Mounting boss portions 3j, 3j in the disk radial direction are formed on both side portions in the disk circumferential direction of one of the working portions 3a arranged on the outside of the vehicle body, and mounting bolt insertion holes 3k in the disk radial direction are formed in each mounting boss portion 3j. are formed respectively, and the caliper body 3 is attached to the vehicle body by screwing a mounting bolt (not shown) inserted through the mounting bolt insertion hole 3k into a caliper mounting portion provided on the vehicle body side.
[0039]
As shown in FIG. 5, the one acting portion 3a is formed with a friction pad housing portion 8 for housing the outer friction pad 5. The friction pad housing portion 8 is located closer to the caliper body than the first ceiling opening 3g. A drive-in side torque receiving surface 8a formed inside and closer to the disc drive-in side than the first ceiling opening 3g, and a second ceiling opening inside the caliper body rather than the second ceiling opening 3h. A running-out side torque receiving surface 8b formed on the disc running-out side of 3h, and a pad support member (not shown) separate from the caliper body 3 that supports the inner side surface of the outer friction pad 5 in the radial direction of the disc. It has
[0040]
As shown in FIGS. 7 and 3, one acting portion 3a has a first ventilation hole 9 that opens to the disk radially outer side surface 3m and the disk rotor side surface 3n located on the extension line of the intermediate bridge portion 3f. is formed, and the first vent hole 9 is formed at an obtuse angle with respect to the side surface of the disc rotor 2 . Further, a first ventilation groove 9a is formed in the disk rotor side surface 3n of one acting portion 3a, extending from the disk radially inner end portion at the intermediate position between the cylinder holes 3i, 3i to the first ventilation hole 9. Via the ventilation groove 9a and the first ventilation hole 9, the running wind W1 passes through the back plate 5b of the outer friction pad 5, the adjacent pistons 6, 6, and the ventilation formed between the disk rotor side surface 3n. While supplying to the space E1, the braking heat is released to the outside air.
[0041]
As shown in FIG. 6, the other working portion 3b arranged inside the vehicle body is formed with a friction pad housing portion 10 for housing the inner friction pad 4. The friction pad housing portion 10 is provided with the one working portion. Similar to the friction pad accommodating portion 8 formed in 3a, a drive-in side torque receiving surface formed on the inner side of the caliper body than the first ceiling opening 3g and on the disc drive-in side of the first ceiling opening 3g. 10a, a delivery-side torque receiving surface 10b formed on the caliper body inner side of the second ceiling opening 3h and on the disc delivery side of the second ceiling opening 3h, and the disc radius of the inner friction pad 4 A pad support member (not shown) is provided separately from the caliper body 3 that supports the inner side surface.
[0042]
As shown in FIGS. 7 and 3, the other acting portion 3b has openings on the disk radially outer side surface 3p and the disk rotor side surface 3q located on the extension line of the intermediate bridge portion 3f. A second ventilation hole 11 having a diameter larger than that of the ventilation hole 9 is formed, and the second ventilation hole 11 is formed at an obtuse angle with respect to the side surface of the disc rotor 2 . Further, a second ventilation groove 11a is formed in the disk rotor side surface 3q of the other acting portion 3b, extending from the radially inner end of the disk at the intermediate position between the cylinder holes 3i, 3i to the second ventilation hole 11. Via the ventilation groove 11a and the second ventilation hole 11, the running wind W1 is transmitted through the ventilation formed between the back plate 4b of the inner friction pad 4, the adjacent pistons 6, 6, and the disk rotor side surface 3q. While supplying to the space E2, the braking heat is released to the outside air. Furthermore, the disc radial outer surface 3r of the disc inlet-side bridge portion 3d, the disc radial outer surface 3s of the intermediate bridge portion 3f, and the disc radial outer surface 3t of the disc outlet-side bridge portion 3e have internal friction. From the extended line of the sliding contact surface between the pad 4 and the disc rotor 2, it is formed so as to gradually incline gently inward in the disc radial direction toward the other working portion side, which is the inner side of the vehicle body.
[0043]
The inner friction pad 4 and the outer friction pad 5 are composed of linings 4a, 5a which are in sliding contact with the side surfaces of the disk rotor 2, and metallic back plates 4b, 5b which are attached by adhering or sintering the linings 4a, 5a. ing. A pair of heat dissipating pieces 4c, 4d, 5c, 5d projecting outward in the disk radial direction and inserted into the first ceiling opening 3g and the second ceiling opening 3h are provided on the outer sides of the back plates 4b, 5b in the disk radial direction. They are integrally protruding.
[0044]
As shown in FIG. 6, when the inner friction pad 4 is assembled to the caliper body 3, the disc radial outer surface 4e of the heat dissipating piece 4c on the disc inlet side of the inner friction pad 4 extends to the first ceiling opening 3g. , and is formed to a length that can be accommodated inside the disk radial outer surfaces 3r and 3s on the other working portion side, and the shape of the disk radial outer surface 4e is the same as the disk radial direction on the other working portion side It is formed in a shape along the shape of the outer side surfaces 3r and 3s, and is formed so as to gradually incline inward in the disc radial direction from the outflow side to the inflow side. In the state where the inner friction pad 4 is assembled to the caliper body 3, the radially outer surface 4f of the heat dissipating piece 4d on the disk exit side of the inner friction pad 4 is arranged in the second ceiling opening 3h, and the other working portion The disk radial outer surface 4f is shaped to match the shape of the disk radial outer surface 3s, 3t on the other working portion side. It is formed in a shape along the circumference of the disk, and is formed so as to gradually incline inward in the disk radial direction from the turn-in side to the turn-out side. Further, both of the heat dissipating pieces 4c and 4d are formed with chamfered portions 4g at the corners on the disk entrance side, the corners on the disk exit side, the disk entrance side surface, and the disk exit side surface, respectively. there is
[0045]
As shown in FIGS. 1 and 5, the heat radiating piece 5c on the disc inlet side of the outer friction pad 5 is arranged such that when the outer friction pad 5 is assembled to the caliper body 3, the disc radial outer surface 5e is the first ceiling. It is disposed in the opening 3g and is formed to a length protruding outward in the disc radial direction. It is formed in a shape that gradually inclines inward in the disc radial direction from the outflow side to the inflow side. The heat dissipating piece 5d on the disk exit side of the outer friction pad 5 has a disk radial outer surface 5f disposed in the second ceiling opening 3h and is formed to have a length protruding outward in the disk radial direction. The shape of the outer surface 5f is formed along the shape of the disk radial outer surfaces 3s and 3t on one working portion side, and is gradually inclined inward in the disk radial direction from the turn-in side toward the turn-out side. formed by In addition, both of the heat radiating pieces 5c and 5d are formed with chamfered portions 5g at the corners on the disk entrance side, the corners on the disk exit side, the disk entrance side surface, and the disk exit side surface. .
[0046]
Since the vehicle disc brake 1 of this embodiment is formed as described above, heat dissipation is provided in the inner friction pad 4 and the outer friction pad 5 through the first ceiling opening 3g and the second ceiling opening 3h. Since the pieces 4c, 4d, 5c, and 5d come into contact with the outside air, the braking heat generated by the sliding contact between the inner friction pad 4 and the outer friction pad 5 and the disc rotor 2 during braking can be released to the outside air. . Further, the volume of the back plates 4b, 5b can be increased without increasing the plate thickness of the back plates 4b, 5b, and the heat capacity for absorbing braking heat can be secured. Further, the heat dissipating pieces 4c, 4d of the inner friction pad 4 have the disk radial outer side surfaces 4e, 4f arranged in the first ceiling opening 3g or the second ceiling opening 3h, Since the inner friction pads 4 are formed to have a length that can be accommodated inside the disk radial outer surfaces 3r, 3s, and 3t, when the caliper body 3 assembled with the inner friction pads 4 and the outer friction pads 5 is attached to the vehicle body, the inner friction pads 4 There is no danger that the heat radiating pieces 4c and 4d will interfere with a member such as a wheel on the vehicle body side. Further, the heat dissipating pieces 5c and 5d of the outer friction pad 5 are arranged such that the disk radial outer surfaces 5e and 5f are arranged in the first ceiling opening 3g or the second ceiling opening 3h, and protrude outward in the disk radial direction. Since it is formed to have a length that is equal to that of the heat radiating pieces 5c and 5d, it is possible to increase the surface area of ​​the heat radiating pieces 5c and 5d to improve the heat radiating property, and to secure a good heat capacity for absorbing braking heat. .
[0047]
In addition, the disc radial outer side surfaces 4e, 4f, 5e, 5f of the heat radiating pieces 4c, 4d, 5c, 5d are placed between the disc inlet side bridge portion 3d and the intermediate portion with the inner friction pad 4 and the outer friction pad 5 assembled. The inner friction pad 4 and the outer friction pad 5 can be attached to and detached from the caliper body 3 by forming the bridge portion 3f and the disk running-out side bridge portion 3e into a shape along the shape of the disk radial direction outer side surfaces 3r, 3s, and 3t. It is possible to improve the heat dissipation property while maintaining good properties. Furthermore, in a state in which the inner friction pad 4 and the outer friction pad 5 are assembled to the caliper body 3, a neat appearance can be obtained. In addition, by forming a plurality of chamfered portions 4g and 5g on the heat dissipating pieces 4c, 4d, 5c and 5d, the surface area of ​​the heat dissipating pieces 4c, 4d, 5c and 5d is increased to improve the heat dissipation and the friction pad. Assembleability can be improved.
[0048]
Furthermore, through the first ventilation groove 9a and the first ventilation hole 9 provided in one acting portion 3a, and the second ventilation groove 11a and the second ventilation hole 11 provided in the other acting portion 3b, A ventilation space E1 formed between the pistons 6, 6 arranged together with the back plate 4b of the inner friction pad 4 and the disc rotor side surface 3q, and the back plate 5b of the outer friction pad 5 are used to pass the running wind W1. The first ventilation groove 9a and the first ventilation hole 9, and the second ventilation groove 11a and the second ventilation space E2 formed between the pistons 6, 6 and the disk rotor side surface 3n. Braking heat can be released to the outside air through the pores 11, and an increase in the temperature of the hydraulic fluid can be prevented. In addition, the first vent hole 9 and the second vent hole 11 are separated from each other by the surroundings of the action parts 3a and 3b located on the extension line of the intermediate bridge part 3f, since the stress applied during braking is lower than that of the other parts. It is possible to secure the rigidity of the caliper body 3 even if it is formed.Further, the weight of the caliper body 3 can be reduced.
[0049]
Further, since the first ventilation hole 9 and the second ventilation hole 11 are formed at an obtuse angle with respect to the side surface of the disc rotor 2, the flow of the traveling wind W1 introduced into the ventilation space portion E1 and the ventilation space portion E2 Alternatively, the flow of braking heat that releases braking heat to the outside air can be improved. Further, the second vent hole 11 formed in the other acting portion 3b arranged inside the vehicle body is formed to have a larger diameter than the first vent hole 9 formed in the one acting portion 3a arranged outside the vehicle body. As a result, the traveling wind W1 can be satisfactorily introduced into the ventilation space portion E2 where the braking heat is easily trapped, and the trapped braking heat can be satisfactorily released to the outside air. Further, the caliper body 3 can more effectively supply the traveling wind W1 to the ventilation space portions E1 and E2 by attaching the caliper body 3 to the vehicle body with the inside in the radial direction of the disc facing the front of the vehicle body.
[0050]
The present invention is not limited to the above-described embodiment, and the length of the heat radiating piece is arbitrary depending on the vehicle body on which the disc brake is mounted. Further, the number of ceiling openings formed in the caliper body is arbitrary, and the heat radiating piece may be appropriately formed according to the number of ceiling openings. Further, it is not necessary to form the outer surface of the heat radiation piece in the radial direction of the disk in a shape that follows the shape of the outer surface of the bridge portion in the radial direction of the disk in a state where the inner friction pad and the outer friction pad are assembled to the caliper body. Further, the chamfered portion may not be formed on the heat radiation piece.
[0051]
Further, it is also possible to provide the ventilation holes only in one of the working parts, and further, it is not necessary to provide only the ventilation holes and not to provide the ventilation grooves. Further, the diameter of the ventilation holes may be appropriately determined according to the position where the caliper body is attached to the vehicle body, and the diameter of the ventilation holes on the outside of the vehicle body is not limited to the diameter larger than the diameter of the ventilation holes on the inside of the vehicle body. .. Further, the present invention can be applied not only to a disc brake using a monocoque piston-opposed caliper body but also to a vehicle disc brake using a split caliper body.
Code description
[0052]
1 ... Vehicle disc brake, 2 ... Disc rotor, 3 ... Caliper body, 3a, 3b ... Acting part, 3c ... Bridge part, 3d ... Disc feeding side bridge part, 3e ... Disc feeding side bridge part, 3f ... Intermediate Bridge part, 3g ... 1st ceiling opening, 3h ... 2nd ceiling opening, 3i ... Cylinder hole, 3j ... Mounting boss part, 3k ... Mounting bolt insertion hole, 3m, 3p, 3r, 3s, 3t ... Disc radial direction Outer side surface, 3n, 3q ... Disc rotor side surface, 4 ... Inner friction pad, 4a ... Lining, 4b ... Back plate, 4c, 4d ... Heat dissipation piece, 4e, 4f ... Disc radial outer surface, 4g ... Chamfered part, 5 ... Outer friction pad, 5a ... Lining, 5b ... Back plate, 5c, 5d ... Heat dissipation piece, 5e, 5f ... Disc radial outer surface, 5g ... Chamfered part, 6 ... Piston, 7 ... Hydraulic chamber, 8 ... Friction pad accommodation Part, 8a ... Retracting side torque receiving surface, 8b ... Retracting side torque receiving surface, 9 ... First ventilation hole, 9a ... First ventilation groove, 10 ... Friction pad accommodating portion, 10a ... Retracting side torque receiving surface, 10b ... Distributing side torque receiving surface, 11 ... Second ventilation hole, 11a ... Second ventilation groove
The scope of the claims
[Claim 1]
A caliper body formed by connecting a pair of working portions having cylinder holes for accommodating pistons, which are arranged opposite to each other with the disc rotor in between, straddling the outer periphery of the disc rotor and connecting with a bridge portion provided with a ceiling opening, and the above-mentioned caliper body. It includes an inner friction pad arranged inside the vehicle body with the disc rotor sandwiched between them, and an outer friction pad arranged outside the vehicle body. The inner friction pad and the outer friction pad have a lining attached to a metal back plate. In each vehicle disc brake formed
A vehicle disc brake characterized in that the back plate is provided with a heat radiating piece to be inserted into the ceiling opening.
[Claim 2]
The heat radiating piece of the inner friction pad is characterized in that the outer surface in the radial direction of the disk is arranged in the ceiling opening and is formed to have a length that fits inside the outer surface in the radial direction of the disk of the bridge portion. Item 1. The vehicle disc brake according to item 1.
[Claim 3]
The vehicle according to claim 1 or 2, wherein the heat radiating piece of the outer friction pad is formed so that the outer surface in the radial direction of the disc protrudes outward in the radial direction of the disc from the ceiling opening. Disc brake.
[Claim 4]
The invention according to any one of claims 1 to 3, wherein a plurality of the ceiling openings are formed in the circumferential direction of the disc of the bridge portion, and a plurality of the heat radiation pieces are formed according to the ceiling openings. Vehicle disc brakes.
[Claim 5]
The outer surface of the heat radiating piece in the radial direction of the disc shall be formed in a shape that follows the shape of the outer surface of the bridge portion in the radial direction of the disc in a state where the inner friction pad and the outer friction pad are assembled to the caliper body. The vehicle disc brake according to any one of claims 1 to 4, wherein the disc brake is characterized.
[Claim 6]
The vehicle disc brake according to any one of claims 1 to 5, wherein the heat radiating piece is formed with a chamfered portion.
[Claim 7]
The pair of working portions are provided with a plurality of cylinder holes in the circumferential direction of the disc, and the bridge portion includes a disc turning side bridge portion formed on the disc turning side when the vehicle is moving forward and a disc turning side bridge portion formed when the vehicle is moving forward. It has a disk feeding side bridge portion formed on the disk feeding side, an intermediate bridge portion formed in the intermediate portion between the disc feeding side bridge portion and the disk feeding side bridge portion, and the intermediate bridge portion. And the ceiling opening is provided between the disk entry side bridge portion and between the intermediate bridge portion and the disk exit side bridge portion, respectively.
One of claims 1 to 6, wherein a vent hole is formed on an extension line of the intermediate bridge portion of at least one of the acting portions so as to open on the outer surface in the radial direction of the disc and the side surface of the disc rotor. Described vehicle disc brakes.
[Claim 8]
A ventilation space portion is provided between the piston housed in each of the cylinder holes provided therein, the back plate, and the side surface of the disc rotor of the action portion, and the ventilation hole communicates with the ventilation space portion. The vehicle disc brake according to claim 7.
[Claim 9]
The vehicle disc brake according to claim 7 or 8, wherein a ventilation groove extending from the inner end portion in the radial direction of the disc to the ventilation hole is formed on the side surface of the disc rotor of the action portion.
[Claim 10]
Any one of claims 7 to 9, wherein the vent is formed at an obtuse angle with respect to the side surface of the disc rotor from the outer surface of the working portion in the radial direction of the disc toward the side surface of the disc rotor. Described vehicle disc brakes.
[Claim 11]
The vehicle disc brake according to any one of claims 7 to 10, wherein the ventilation holes are formed in each of the pair of the working portions.
[Claim 12]
The eleventh aspect of claim 11, wherein the ventilation hole formed in the action portion arranged inside the vehicle body is formed having a diameter larger than that of the ventilation hole formed in the action portion arranged outside the vehicle body. Vehicle disc brakes.
[Claim 13]
The vehicle disc brake according to any one of claims 7 to 12, wherein the caliper body is attached to the vehicle body with the inside in the radial direction of the disc facing the front of the vehicle body.