JPH11241740A - Vehicular disk brake - Google Patents

Abstract

PROBLEM TO BE SOLVED: To ensure stiffness sufficiently resisting to brake reaction from the frictional pad on a bridge part of the caliper body, and suppress a load on a caliper body to the utmost in a small level while receiving a part of a brake torque from a frictional pad by the caliper body. SOLUTION: A reverse pin 5 and a car body installing arm 4g provided with a pin hole 26 for housing the pin 5 are arranged on one side part of a disk rotor 2 and on a disk turning-in side when a vehicle is advanced. A collet pin 6 and a caliper supporting arm 3d provided with a pin hole 11 for housing the pin 6, are arranged on a disk turning-out side when the vehicle is advanced while extending over the outside of the disk rotor 2. Frictional pads 7, 8 are received on torque receiving stage parts 3g, 3h so as to carry out a brake operation when the vehicle is advanced. The frictional pad 7 is received on the torque receiving stage part 3f, and the frictional pad 8 is received by engaging a reaction claw 4e with a projection 14c so as to carry out the brake operation when the vehicle is retreated.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an automobile and an automobile.
The present invention relates to a disc brake mounted on a traveling vehicle such as a tricycle and, more particularly, to a disc brake having a pin slide type caliper body guided in a disc axial direction by a pair of slide pins in which a reverse spin and a collet pin are combined.

[0002]

2. Description of the Related Art Disc brakes used in four-wheeled vehicles and the like are disclosed, for example, in JP-A-52-56267 and JP-B-62-4741. Each of the caliper bodies used for these disc brakes has, on both sides of the disc rotor, an action portion and a reaction portion that are arranged to face each other with a pair of friction pads interposed therebetween.
A caliper bracket fixed to the vehicle body at one side of the disc rotor, with the disc inlet and outlet sides of the caliper body being connected by a bridge section that is arranged over the outer periphery of the disc rotor. Are supported movably in the disk axial direction via a pair of slide pins.

[0003] Further, in the former disc brake, a caliper bracket fixed to the vehicle body at one side of the disc rotor is formed in a bifurcated shape branching to both sides of an action portion, and the caliper bracket is attached to the caliper body. A tie bar that straddles the outer periphery of the disk rotor to the reaction portion side across the bridge portion and surrounds the reaction portion and connects to the forked portion of the caliper body; and a caliper support extending outside the disk rotor along one side of the bridge portion. Arm, and one slide pin is formed as a collet pin that protrudes from one side of the working portion to the outside of the disk rotor along one side of the bridge portion and is supported by the pin hole of the caliper support arm. Attach the slide pin from the caliper bracket to the other side of the working part by protruding the other side of the working part in the direction opposite to the disk rotor, and projecting to the other side of the working part. It is a reverse spin supported by the pin hole of the arm, receives the braking torque from the friction pad with the high rigidity of the caliper support arm on the collet pin side, and the caliper body moves to the working part due to wear of the friction pad lining. When the weight of the caliper body is deviated toward the working portion side by the adjustment movement, the caliper body is supported in a well-balanced manner by the reverse spin in which the insertion length into the pin hole hardly changes.

In the latter disc brake, a pair of slide pins are formed as a reverse spin protruding in the direction opposite to the disc rotor toward one side of the disc rotor, which is the operating portion of the caliper body. While always supporting the caliper body in a well-balanced manner, the bridge portion of the caliper body is enlarged in the circumferential direction of the disk to provide a ceiling opening at the center, and through the ceiling opening,
A pair of friction pads can be inserted and removed from both sides of the disk rotor.

[0005]

In a disk brake using such a pin slide type caliper body, a braking reaction force from a friction pad is applied to a working portion and a reaction portion during braking in a direction opposite to the disk rotor. In order to increase the rigidity by increasing the area of the bridge part as much as possible, the caliper body tries to increase the rigidity force as much as possible with the bridge part as a fulcrum, but in the former disc brake, the collet pin and the reverse spin The caliper supporting arm for accommodating the collet pin at one side of the bridge portion protrudes the outer periphery of the disk rotor in the direction of the reaction portion. At the side, the head of the reverse spin protrudes to the outer periphery of the disk rotor, and the braking torque generated on the friction pad on the reaction portion when the vehicle retreats. Of the caliper body is restricted by the tie bar of the caliper bracket, so the length of the bridge in the caliper body is restricted to the distance between the reverse spin and the collet pin, making it difficult to increase the area of the bridge and increase the rigidity. Met.

In the latter type of disc brake, friction pads are brought into contact with both sides of the ceiling opening formed in the bridge portion in the circumferential direction of the disc, and the braking generated on the friction pads when the vehicle moves forward and backwards. Since the torque is received by the bridge, especially when braking when the vehicle is moving forward,
The braking torque in the disc ejection direction and the C-shape deformation due to the braking reaction force have a large effect on the bridge, and the rigidity is reduced by cutting the ceiling opening to reduce the area of the bridge. This puts a heavy load on the bridge.

SUMMARY OF THE INVENTION The present invention has been made in view of such circumstances, and an object of the present invention is to provide a bridge portion with a rigidity sufficient to withstand a braking reaction force from a friction pad. An object of the present invention is to provide a disc brake for a vehicle which can minimize a load on the caliper body while receiving a part of the braking torque from the caliper body.

[0008]

According to the above object, according to the first aspect of the present invention, a working portion and a reaction portion facing each other across a pair of friction pads are provided on both sides of the disk rotor. A caliper body is configured by being connected by a bridge portion arranged straddling, and a disk inlet side and an outlet side of the caliper body are attached to a caliper bracket fixed to a vehicle body at one side of the disk rotor, A pair of slide pins are provided so as to be movable in the disk axis direction, and one of the slide pins is projected from the caliper bracket in parallel with the disk axis to be formed on a body mounting arm of the caliper body. A reverse spin supported by a pin hole is provided, and the other of the slide pins protrudes from the caliper body in parallel with a disc axis, and In a vehicle disk brake serving as a collet pin supported by a pin hole formed in a caliper support arm of a ket, the collet pin and the caliper support arm are disposed across the outer periphery of the disk rotor, and the reverse spin and the reverse spin are provided. A vehicle body mounting arm is disposed on one side of the disk rotor in the disk radial direction with respect to the bridge portion of the caliper body, and one end of the bridge portion on the side where the reverse spin is disposed in the disk circumferential direction. , So as to overlap the extension of the river spin.

According to a second aspect of the present invention, in the first aspect of the present invention, the reverse spin and the vehicle body mounting arm are disposed on the disk retraction side when the vehicle advances, and the collet pin and the caliper support arm are connected to each other when the vehicle advances. In addition, the friction pad is supported on the caliper support arm for braking when the vehicle is traveling forward, and the friction pad on the working section is supported with the caliper bracket for braking when the vehicle is traveling backward. And
Similarly, the friction pad on the reaction portion side due to braking during backward running of the vehicle is supported by the engagement between the disk entry side portion of the friction pad on the reaction portion side and the reaction portion of the caliper body during forward movement of the vehicle.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to the drawings. 1 is a front view of the disc brake, FIG. 2 is a plan view thereof, FIG. 3 is a rear view thereof, and FIG.
5 is a sectional view taken along line IV-IV of FIG. 1, FIG. 5 is a sectional view taken along line VV of FIG. 2, and FIG. 6 is a sectional view taken along line VI-VI of FIG.

In the disc brake 1, a caliper bracket 3 is fixedly mounted on the vehicle body on one side of a disc rotor 2 which rotates in the direction of arrow A when the vehicle advances, and a pin slide type caliper body 4 is mounted on the caliper bracket 3. , And is supported so as to be movable in the axial direction of the disc via a reverse spin 5 and a collet pin 6, and a pair of friction pads 7, between the action portion 4 a and the reaction portion 4 b of the caliper body 4.
8 are provided with the disk rotor 2 interposed therebetween.

The caliper bracket 3 has a substantially U-shape. The base of a first arm 3a and a second arm 3b, which are juxtaposed outwardly in the disk radial direction on the disk inlet side and the disk output side, are provided at the base. Each has a vehicle body mounting hole 3c. A caliper support arm 3d extending across the outside of the disk rotor 2 in parallel with the disk axis extends from the second arm 3b on the disk outlet side, and the caliper support arm 3d extends to the other side of the disk rotor 2. A third arm 3e extends at the same position as the second arm 3b.

The first arm 3a of the caliper bracket 3 and the second arm 3a
The arm 3b is provided with torque receiving steps 3f and 3g facing each other, and the third arm 3e is provided with a torque receiving step 3h having substantially the same shape as the second arm 3b. The distal end of the first arm 3a is located radially inward of the outer peripheral edge 2a of the disk rotor 2 and the bridge portion 4c of the caliper body 4 provided so as to cover the outer peripheral edge 2a. A female screw hole 10 is provided at the end of the female screw hole 10, and the above-described reverse spin 5 is provided in the female screw hole 10 in a direction opposite to the disk rotor in parallel with the disk shaft, and from the outer peripheral edge 2 a of the disk rotor 2. The caliper support arm 3d located radially outward of the disk also has a pin hole 11 having a bottom parallel to the disk axis.
Are provided on one side surface side of the disk rotor 2.

The caliper body 4 is composed of the above-described working portion 4a and the reaction portion 4b which are arranged opposite to both sides of the disk rotor 2, and a bridge portion 4c which straddles the outside of the disk rotor 2 and connects them. A cylinder hole 20 is provided at the center of the action portion 4a so as to open toward the disk rotor 2, and a cup-shaped piston 21 is housed in the cylinder hole 20 in a liquid-tight and movable manner.
And a bottom wall 4 d of the cylinder hole 20, a hydraulic chamber 22 is defined. A union hole 23 is provided in the bottom wall 4 d of the cylinder hole 20 so as to communicate with the hydraulic pressure chamber 22. The hydraulic fluid pressurized by a separate hydraulic master cylinder (not shown) is transferred from the union hole 22 to the hydraulic pressure chamber 23. The piston 21 is pushed and moved by being introduced.

In the reaction portion 4b, a pair of reaction force claws 4e and 4f are juxtaposed inward in the radial direction of the disk on the disk entrance side and the disk exit side with the gap 24 interposed therebetween. The friction pad 7 is provided between the tip of the piston 21 protruding from the cylinder hole 20 and one side surface of the disk rotor 2, and the friction pad 8 on the reaction portion side is provided with the reaction force claws 4 e and 4 f and the other side surface of the disk rotor 2. And each is arranged between. A ceiling opening 25 is formed at the center of the bridge portion 4c, through which the braking heat generated by the sliding contact between the disk rotor 2 and the linings 12, 12 of the friction pads 7, 8 is dissipated. Also, the degree of wear of the linings 12 and 12 can be visually checked.

Body attaching arms 4g and 4h are protruded from one side of the disk rotor 2 on the disk entry side and the exit side of the action portion 4a. At the end, a pin hole 26 is provided penetrating in parallel with the disk shaft. At the end of the vehicle mounting arm 4h on the disk outlet side, the aforementioned collet pin 6 is provided with the disk outlet side end of the bridge portion 4c. 4j, it protrudes in parallel with the disk axis. In the pin hole 26 on the disc insertion side,
The reverse spin 5 of the caliper bracket 3 and the collet pin 6 on the disc outlet side are movably inserted into the pin holes 11 of the caliper support arm 3d, respectively. The relative movement of the pin holes 11, 26 guides the movement in the disk axial direction.

The reverse spin 5 on the disk reciprocating side and the vehicle mounting arm 4g on the disk reciprocating side having a pin hole 26 for accommodating the pin 5 are provided on one side of the disk rotor 2 and outside the rotor 2. The peripheral edge 2a and the bridge portion 4c disposed over the peripheral edge 2a are disposed radially inward of the disk, and
Unlike the combination of the collet pin 6 on the disc unwinding side and the caliper support arm 3d having the pin hole 11 for accommodating the pin 6, there is no straddling outside the disc rotor 2, so the disc of the bridge portion 4c The reciprocating side end 4i is defined by two extension lines L1 and L2 indicating the reverse spin 5 and the diameter D of the pin hole 26.
And extends to the disk retraction side to increase the area of the bridge portion 4c in the disk circumferential direction.

The friction pads 7, 8 are provided with a lining 12 slidably in contact with the side surface of the disk rotor 2,
And metal back plates 13 and 14 for holding
The friction pad 7 on the working portion side has ear pieces 13a, 13a protruding on the disc reciprocating side and the rewinding side of the back plate 13, and the friction pad 7 connects the ear pieces 13a, 13b to the caliper bracket 3. The torque receiving steps 3f of the first and second arms 3a and 3b,
3 g are supported via pad retainers 15, respectively.

Further, in the friction pad 8 on the reaction portion side, the lug 14a is provided only on the disk feeding side of the back plate 14, and three projections 14b, 14c, 1 are provided on the back surface of the back plate 14.
4d protrudes in a straight line. A pad spring 16 is attached to the central projection 14b by press-fitting, caulking, or the like. The projection 14c on the disk reentrant side has an outer surface formed in the same arc shape as the space 24 between the reaction force claws 4e and 4f. The friction pad 8 supports the ear piece 14a to the torque receiving step 3h of the third arm 3e of the caliper bracket 3 via the pad retainer 15, and the projection 14c is attached to the inner surface of the reaction force claw 4e on the disk reciprocating side. The two wings 16a, 16a of the pad spring 16 are moved to the reaction pawls 4e,
4f is fitted and pressed into recesses 4k, 4k on the back surface of 4f.

This embodiment is configured as described above.
When the pressurized hydraulic fluid is supplied to the hydraulic chamber 22 of the caliper body 4 by the driver's braking operation, the piston 21 advances through the cylinder hole 20 toward the opening, and the friction pad 7 on the side of the action portion 4a is moved. And presses the lining 12 of the friction pad 7 against one side surface of the disk rotor 2. Next, due to this reaction, the caliper body 4 is moved in the direction of the action portion 4 a by the guide of the reverse pin 5 and the collet pin 6,
The reaction force claws 4e and 4f of the reaction portion 4b push the friction pad 8 on the reaction portion 4b side, and the lining 12 of the friction pad 8 is moved.
Is pressed against the other side surface of the disk rotor 2 to perform a braking action.

At the time of the above-mentioned braking, the friction pads 7 and 8
The sliding contact between the lining 12 and the disk rotor 2 generates a braking torque, and the friction pads 7 and 8 are slid in the same direction A or B as the rotation of the disk rotor 2 by the braking torque. Of these, during braking when the disk rotor 2 rotates in the direction of arrow A when the vehicle is traveling forward, the friction pad 7 on the action portion 4a moves the lug 13b of the back plate 13 to the torque receiving step 3g at the base of the caliper support arm 3d. The friction pad 8 on the side of the reaction portion 4b is
Is supported by the torque receiving step 3h at the tip of the caliper support arm 3d, and the braking torque of the friction pads 7, 8 is transmitted to the caliper bracket 3.

Further, during braking when the disk rotor 2 rotates in the direction of arrow B when the vehicle is moving backward, the friction pad 7 on the side of the action portion 4a applies the lug 13a of the back plate 13 to the torque receiving step of the first arm 3a. 3f, the braking torque of the friction pad 7 is transmitted to the caliper bracket 3, and the friction pad 8 of the reaction portion 4b is supported by the projection 14c of the back plate 14 by the reaction force claw 4e. 8 is transmitted to the caliper body 4 through the reaction force claw 4e.

As described above, in the present embodiment, the caliper body 4
The collet pin 6 and the caliper support arm 3d are arranged so as to straddle the outside of the disc rotor 2 on the disc outlet side of the disc, so that large braking generated on the friction pads 7 and 8 due to braking during forward running of the vehicle. Torque can be reliably received by the caliper supporting arm 3d having high rigidity. In particular, on the reaction part 4b side of the forward running of the vehicle, the drag torque from the disk rotor 2 acts on the reaction part 4b and the friction pad 8 in the direction of arrow A, and the reaction force claw 4e of the reaction part 4b and the friction pad 8 Is maintained in an engaged state with the projection 14c, and the reaction portion 4b
In the friction pad 8 on the side, the disc reciprocating side and the revolving side are sandwiched between the reaction force claw 4e and the torque receiving step 3h, so that the micro vibration during braking is suppressed, and the brake squeal caused by this is suppressed. It can be prevented as much as possible.

Further, when the vehicle is moving backward, the generated braking torque is smaller than in the case of forward running of the vehicle, the braking torque of the friction pad 7 on the action section side is changed to the second structure having the same structure as that of the braking torque during forward running. The braking torque of the friction pad 8 on the reaction portion side is supported by one arm 3a, and the braking force of the reaction force claw 4e and the projection 14c
And can be supported by the caliper body 4.

Further, the lining 1 of the friction pads 7 and 8
2 and 12 wear out, and the caliper body 4
When the caliper body 4 is adjusted to the side a and the weight of the caliper body 4 is deviated toward the working portion 4a, the reverse spin 5 and the reverse spin 5 are attached to one side of the disc rotor 2 which is the working portion 4a of the caliper body 4. The caliper body 4 can be supported in a well-balanced manner since the body mounting arm 4g having the pin hole 26 to accommodate the caliper body 4 is provided.

A reverse spin 5 and a body mounting arm 4g
On the disk entry side of the caliper body 4, which does not straddle the outside of the disk rotor 2, the disk entry side end 4 i of the bridge portion 4 c is connected to two extension lines indicating the reverse spin 5 and the diameter D of the pin hole 26. By extending the area of the bridge portion 4c in the circumferential direction of the disk by covering L1 and L2 and extending to the disk reciprocating side, the rigidity of the bridge portion 4c can be sufficiently increased. Can be sufficiently suppressed. Similarly, by increasing the rigidity of the bridge portion 4c,
Since the braking torque applied to the reaction portion 4b of the caliper body 4 by the engagement of the projection e and the projection 14c can be small only from the friction pad 8 on the reaction portion 4b side due to the braking when the vehicle moves backward, the bridge portion 4c is Withstand braking torque well,
The load and behavior on the caliper body 4 can be minimized.

In the above-described embodiment, the reverse spin is arranged on the disk entrance side in the vehicle forward direction, and the collet pin is also arranged on the disk exit side in the vehicle forward direction, respectively. The reverse spin may be arranged on the disc advance side in the vehicle forward direction and the collet pin may be arranged on the disc inward side in the vehicle forward direction.In this case, when the caliper body is adjusted, the weight of the caliper body is reduced. While the collet pin supports in a well-balanced manner, the area of the bridge portion is enlarged in the circumferential direction of the disk, and the rigidity of the bridge portion is enhanced.

Further, in the above-described embodiment, the end of the bridge portion provided with the reverse spin on the disk entry side extends so as to overlap the extension of the entire diameter of the reverse spin, but the present invention is not limited to this. It is not necessary for the end of the bridge to cover the entire reverse spin, and at least the end in the circumferential direction of the disk on the reverse spin placement side of the bridge may reduce the area of the bridge even if it is partially overlapped with the extension of the reverse spin. Can increase.

[0029]

As described above, according to the first or second aspect of the present invention, when the caliper body is adjusted by the lining wear of the friction pad, the uneven weight of the caliper body is reduced by the collet. Since the area of the bridge part is enlarged in the disk circumferential direction while the pins are supported in a well-balanced manner, the rigidity of the bridge part is increased, so that it can fully withstand the U-shaped deformation due to the braking reaction force from the friction pad become.

Further, according to the second aspect of the present invention, the collet pin and the caliper support arm are disposed on the caliper body on the disk outlet side so as to straddle the outer side of the disk rotor, so that the vehicle can travel when the vehicle is traveling forward. A large braking torque generated in the friction pad by braking can be reliably received. Especially,
On the reaction portion side of the forward running of the vehicle, drag torque from the disk rotor acts on the reaction portion and the friction pad in the disk unwinding direction, and the engagement state between the reaction portion and the disk retraction-side portion of the friction pad is changed. The friction pad on the reaction part side is maintained, and the disc reciprocating side and the dispensing side are sandwiched between the caliper support arm and the reaction part, so that micro vibration during braking is suppressed and brake squeal caused by this is suppressed. It can be prevented as much as possible.

Also, the braking torque applied to the reaction portion of the caliper body can be reduced only from the friction pad on the reaction portion side due to braking when the vehicle moves backward, so that the area is increased in the disk circumferential direction to increase the rigidity. The bridge portion can withstand this braking torque well and can minimize the load and behavior on the caliper body.

[Brief description of the drawings]

FIG. 1 is a front view of a disc brake showing one embodiment of the present invention.

FIG. 2 is a partial cross-sectional plan view of a disc brake showing one embodiment of the present invention.

FIG. 3 is a rear view of a disc brake showing one embodiment of the present invention.

FIG. 4 is a cross-sectional view taken along the line IV-IV of FIG. 1, showing one embodiment of the present invention.

FIG. 5 is a cross-sectional view taken along the line VV in FIG. 2 showing one embodiment of the present invention.

FIG. 6 is a cross-sectional view taken along the line VI-VI of FIG. 4 showing one embodiment of the present invention.

DESCRIPTION OF SYMBOLS 1 ... Disc brake 2 ... Disc rotor 2a ... Peripheral edge of disc rotor 2 3 ... Caliper bracket 3a ... First arm 3b ... Second arm 3d ... Caliper support arm 3e ... Third arm 3f, 3g, 3h ... Torque receiving step portion 4... Caliper body 4 a... Working portion 4 b... Reaction portion 4 c. Bridge portion 4 e... Disk rewinding side reaction force claw 4 f. Arm 4h: Body attaching arm on disc rewind side 4i ... Disc retreat side end of bridge 4c 4j ... Disc retreat side end of bridge 4c 5 ... Reverse spin 6 ... Collet pin 7 ... Friction pad on action part 4a side 8: Friction pad on reaction part 4b side 11, 26 ... Pin hole 12: Lining of friction pad 7, 8 13 ... Back plate of friction pad 7 on action part side 14: Friction on reaction part side Back plate 13a, 13b, 14a of pad 8 Ear pieces 14b, 14c, 14d of back plates 13 and 14 Protrusion of back plate 14 16 Pad spring 20 Cylinder hole 21 Piston 22 Hydraulic chamber 24 Reaction force Distance between pawls 4e, 4f A: Rotation direction of disk rotor 2 during forward travel of vehicle B: Rotation direction of disk rotor 2 during reverse travel of vehicle D: Diameter of reverse spin 5 and pin hole 26 L1, L2: Reverse spin 5 and two extension lines indicating the diameter D of the pin hole 26

Claims (2)

[Claims] A caliper body is formed on both sides of a disk rotor by connecting a working portion and a reaction portion opposed to each other with a pair of friction pads interposed therebetween by a bridge portion provided over the outer periphery of the disk rotor. The disk inflow side and the outflow side of the caliper body are supported by a caliper bracket fixed to the vehicle body at one side of the disk rotor so as to be movable in the disk axial direction via a pair of slide pins. Either one of the slide pins protrudes from the caliper bracket in parallel with the disc axis to form a reverse spin supported by a pin hole formed in a body mounting arm of the caliper body. A protruding parallel to a disc axis from the caliper body and supported by a pin hole formed in a caliper supporting arm of the caliper bracket. In a vehicle disk brake serving as a let pin, the collet pin and the caliper support arm are disposed across the outer periphery of the disk rotor, and the reverse spin and the vehicle body mounting arm are disposed at one side of the disk rotor. Disposed radially inward from the bridge portion of the caliper body in the disk radial direction, and one end in the disk circumferential direction of the bridge portion on the side where the reverse spin is disposed,
A disc brake for a vehicle, wherein the disc brake extends so as to overlap an extension of a reverse spin. 2. The reverse spin and the vehicle body mounting arm are disposed on a disk retraction side when the vehicle advances, and the collet pin and the caliper support arm are disposed on a disk retraction side when the vehicle advances. At the same time, both the friction pads are supported by the caliper support arms during braking during forward running of the vehicle, and the friction pads on the action section side are supported by the caliper bracket during braking during reverse running of the vehicle. 2. A friction pad on a reaction portion side due to braking of the vehicle is supported by engagement of a disc retraction side portion of the friction pad on the reaction portion side and a reaction portion of the caliper body when the vehicle advances. A vehicle disk brake according to claim 1.