JP2001280377A - Caliper body mounting structure of disc brake for vehicle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve mounting strength of a mounting bolt arranged on a disc turn out side of a caliper body and prevent eccentric wear of a lining and the reduction of a braking force by suppressing the action of a bending moment on the caliper body when brake is applied as much as possible. SOLUTION: A mounting bolt 5 on a disc turn in side of the caliper body 2 is arranged in parallel with a line L1 in the radial direction of a disc. The mounting bolt 6 on the disc turn out side is arranged substantially along the direction of rotation of a disc rotor 4 in the same way.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a structure for mounting a caliper body of a disc brake used for various traveling vehicles such as a motorcycle and an automobile to a vehicle body. The present invention relates to a caliper body mounting structure for connecting a caliper body to a vehicle body.

[0002]

2. Description of the Related Art In a conventional disc brake for a vehicle, a bolt insertion hole of a caliper body is formed in parallel with a disc axis, and a mounting bolt inserted through the bolt insertion hole is screwed into a caliper mounting portion of a vehicle body. Although the body is mounted on the vehicle body, in recent motorcycle races and the like, when the friction pad is replaced at the pit, the caliper body can be quickly attached and detached. For example, Japanese Patent Application Laid-Open No. 10-331878 discloses A mounting structure of a caliper body called a radial mount as shown in FIG.

In this prior art, a pair of bosses for mounting a vehicle body are provided on one of a working portion of a caliper body on a disk inlet side and a disk outlet side, and a bolt insertion hole is formed in each of the boss portions so as to be orthogonal to the disk shaft. The vehicle body mounting boss is abutted against the caliper mounting portion on the vehicle body side, and the male screw portion of the mounting bolt inserted into each of the bolt insertion holes is screwed into the caliper mounting portion. By screwing into the female screw hole, the caliper body is bolted to the vehicle body.

[0004]

In such a configuration, the friction pad is dragged in the disk unwinding direction by the frictional force caused by the sliding contact between the side surface of the disk rotor and the lining of the friction pad during braking. The pad comes into contact with the torque receiving part formed on the disc outlet side of the caliper body, and the braking torque from the friction pad acts as a shearing force on the mounting bolt on the disc outlet side through the torque receiving part. It causes a decrease.

In the caliper body, the vehicle body mounting portion of one of the working portions located on one side of the disk rotor is mounted so as to be deviated from the caliper mounting portion of the vehicle body. At the same time, the caliper body is pulled in the disc unwinding direction, and at the same time, a bending moment acts to move the disc inflow side of the caliper body in the direction of the other working portion, causing uneven wear of the lining, brake squeal, and a reduction in braking force. Was causing it.

Therefore, in the present invention, the mounting strength of the mounting bolts on the disk outlet side is improved, and the bending moment acting on the caliper body at the time of braking is suppressed as much as possible. It is an object of the present invention to provide a mounting structure of a caliper body that can prevent the occurrence of a caliper.

[0007]

According to a first aspect of the present invention, a bolt insertion hole is provided in a body mounting portion of a caliper body disposed across a disk rotor on a disk inlet side and an outlet side of a caliper body. Is formed in a direction perpendicular to the disk shaft, and a shaft portion of a mounting bolt is inserted into the bolt insertion hole, and a male screw portion of the mounting bolt is screwed into a female screw hole of a caliper mounting portion of the vehicle body. In the caliper body mounting structure for a vehicle disc brake, the bolt insertion holes of the vehicle body mounting portion on the disk outlet side are disposed substantially along the rotation direction of the disk rotor. Also the second
According to the invention, in addition to the first invention, a bolt insertion hole on the disk outlet side is arranged outside the outer peripheral surface of the disk rotor.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment in which the present invention is applied to a motorcycle will be described below with reference to the drawings.

A caliper body 2 used for the disc brake 1 is supported by the lower end of the front fork 3 and straddles a disc rotor 4 which rotates together with a wheel (not shown) in the direction of arrow A, and is integrated with the front fork 3. The mounting bolts 5 and 6 are attached to the caliper mounting portions 3a and 3b provided.
It is attached using.

The caliper body 2 has a pair of working portions 2a, 2b opposed to both sides of the disk rotor 4.
And a bridge portion 2c for connecting the two over the outer periphery of the disk rotor 4 and integrally forming three large and small cylinder holes 7 on the action portions 2a and 2b, respectively, in the disk circumferential direction. It is formed as a six-pot piston-facing type in which a large-diameter or small-diameter piston 8 is accommodated in the hole 7. The caliper body 2 is formed on a vehicle body attachment portion 2d formed on one operating portion 2a provided on one side of the disk rotor 4, and on a bridge portion 2c provided on the outer peripheral surface of the disk rotor 4. The mounted vehicle body mounting portion 2e is mounted to the caliper mounting portions 3a, 3b using mounting bolts 5, 6.

At the center of the bridge 2c, a ceiling opening 9 is provided.
Are formed so as to straddle both the action portions 2a and 2b, and penetrate through the ceiling opening 9 and are stretched across the disk axial direction.
A pair of friction pads 1 is attached to the hanger pins 10 and 10.
1 and 11 are suspended with the disk rotor 4 interposed therebetween. Each friction pad 11 includes a lining 11a and a back plate 11
The hanger pins 10, 10 are inserted into the upper part of the back plate 11b, and are moved in the disk axial direction between the disk receiving side 2f, 2f of the caliper body 2 and the disk receiving side 2f, 2f. Supported as possible.

At the bottom of each cylinder hole 7, a hydraulic chamber 12 is defined by inserting a piston 8, and three adjacent hydraulic chambers 12 are connected to each other in each of the working portions 2a and 2b. (Not shown), and the two hydraulic chambers 12, 12 of the working portions 2a, 2b communicate with each other through a communication hole (not shown), and the hydraulic fluid is pressurized by a separate hydraulic master cylinder. Are introduced into the six hydraulic chambers through the communication holes.

The body mounting portion 2d of the caliper body 2 on the disk reciprocating side is adapted to connect the disk reciprocating side of one of the action portions 2a located on one side of the disk rotor 4 to the rotation center O1 of the disk rotor 4 and the caliper body. 2 is formed on a boss portion parallel to the disk radial line L1 connecting the pad pressing center O2 and along the side surface of the disk rotor 4, and the vehicle body mounting portion 2d is provided with the mounting bolt 5 described above. A bolt insertion hole 2g having a diameter slightly larger than the shaft diameter is formed in parallel with a disk radial direction line L1 orthogonal to the disk axis. The vehicle mounting portion 2e on the disk outlet side is formed in a boss portion in which the disk outlet side of the bridge portion 2c is built up in the rotation direction of the disk rotor 4. The vehicle mounting portion 2e has a mounting bolt. A bolt insertion hole 2h slightly larger in diameter than the shaft diameter of No. 6 is formed to penetrate substantially along the rotation direction of the disk rotor 4.

Of the caliper mounting portions 3a, 3b on the vehicle body side, the caliper mounting portion 3a on the disk revolving side is formed so as to protrude from the disk revolving side of the front fork 3 along one side surface of the disk rotor 4 in a mountain shape. The caliper mounting portion 3b on the disk outlet side is formed so as to protrude from the disk inlet side of the front fork 3 to the outside of the outer peripheral surface of the disk rotor 4.

[0015] The caliper mounting portion 3a on the disk re-entry side.
The seat surface 3e of the caliper body 2 which abuts with the vehicle body attachment portion 2d is set on a line orthogonal to the disk radial direction line L1, and the disk radial direction line L1 is provided on the seat surface 3e.
And a female screw hole 3c is formed in parallel with. Also, the caliper mounting portion 3b on the disc outlet side is provided with the caliper body 2
A seating surface 3f which abuts with the vehicle body mounting portion 2e is provided substantially orthogonal to the rotation direction of the disk rotor 4.
A female screw hole 3d is formed at a position on the seat surface 3f outside the disk rotor substantially along the rotation direction of the disk rotor 4.

The mounting bolts 5 for the disk insertion side include:
A bolt longer than the mounting bolt 6 for the disk retracting side is used.
A male thread portion 5a slightly longer than the female screw hole 3c on the disk rewind side is engraved.
Is formed with a male screw portion 6a slightly longer than the female screw hole 3d on the disc outlet side.

The caliper body 2 has a vehicle body mounting portion 2d,
The lower side of the bolt insertion hole 2e is brought into contact with the seating surfaces 3e and 3f of the caliper mounting portions 3a and 3b, respectively.
g, 2h and the female screw holes 3c, 3d, and the shaft of the mounting bolt 5 from outside the bolt insertion hole 2g on the disk entry side, and the mounting bolt from the outside of the bolt insertion hole 2h on the disk exit side. The caliper body 3 is mounted on the caliper mounting portions 3a, 3b of the front fork 3 by inserting the shaft portions 6 through the male screw portions 5a, 6a into the female screw holes 3c, 3d, respectively.

Further, among the above-mentioned mounting bolts 5, 6,
The mounting bolt 5 on the disk reciprocating side is
The one side portion is displaced and provided on one action portion 2a of the caliper body 2, whereas the mounting bolt 6 on the disc outlet side is disposed on the center of the caliper body 2 and the disc rotor 4.

In the caliper body 2 mounted as described above, the disc rotor 4 and the friction pad 1
The friction pads 11, 11 are slid in the disk feeding direction by the frictional force generated by the sliding contact between the linings 11a, 11a, and the disk feeding side surfaces of the back plates 11b, 11b are torque receiving portions 2f on the disk feeding side. , 2f, and the braking torque generated in the friction pads 11, 11 is applied to the torque receiving portion 2.
f, 2f. The braking torque that has entered the torque receiving portions 2f, 2f enters the caliper mounting portion 3b on the disk discharging side from the caliper body 2 through the mounting bolt 6 on the disk discharging side, and is further absorbed by the front fork 3, which is the vehicle body. .

The braking torque from the caliper body 2 to the mounting bolt 6 acts on the mounting bolt 6 arranged substantially along the rotational direction of the disk rotor 4 in the direction of the center axis thereof. Does not act as a shear force. As a result, it is possible to sufficiently secure the mounting strength of the caliper body 2 on the disc outlet side even for repeated braking over a long period of time.

Also, the mounting bolt 6 on the disc outlet side
Above the center of the caliper body 2 and the disk rotor 4
It is positioned equidistant from the disc receiving side torque receiving portions 2f, 2f, and the braking torque to the mounting bolt 6 is uniformly transmitted from the torque receiving portions 2f, 2f, so that an unbalanced load acts on the caliper body 2. And the generation of a bending moment for causing the disk reversing side to move toward the other acting portion 2b is suppressed as much as possible. As a result, uneven wear of the lining 11a and occurrence of brake squeal are effectively prevented, and the predetermined braking force set on the disc brake 1 can be stably exerted.

The mounting bolts on the disk reciprocating side need not necessarily be parallel to the disk radial line passing through the pad pressing center of the caliper body shown in the embodiment if they are perpendicular to the disk axis. It may be oriented in a radial direction or another direction. Further, it is preferable that the mounting bolt on the disk outlet side is parallel to the tangent of the disk radial line at the mounting position, but any bolt may be used as long as it is substantially along the rotation direction of the disk rotor.

The present invention can be applied not only to the disk inflow side of the front fork shown in the embodiment, but also to the disk outflow side of the front fork and the rear swing arm. Further, the present invention can be widely applied to automobiles having four or more wheels besides bar-handle vehicles such as motorcycles.

[0024]

As described above, according to the structure of the first aspect of the present invention, the braking torque transmitted from the caliper body to the mounting bolt on the disk outlet side is substantially equal to the axial direction of the mounting bolt on the disk outlet side. , And no longer acts as a shearing force on the mounting bolt as in the prior art, so that even during repeated braking, the mounting strength of the caliper body can be sufficiently ensured for a long period of time.

According to the second aspect of the present invention, since the braking torque is uniformly applied from the torque receiving portions to the mounting bolts on the disk outlet side, an unbalanced load is less likely to be applied to the caliper body, and the disk inlet side is not affected. The generation of a bending moment that attempts to behave in the direction of the other acting portion is suppressed as much as possible.
As a result, uneven wear of the lining and occurrence of brake squeal are effectively prevented, and a predetermined braking force set for the disc brake can be stably exerted.

[Brief description of the drawings]

FIG. 1 is a sectional view of an essential part showing a mounted state of a caliper body according to an embodiment of the present invention.

FIG. 2 is a sectional view taken along line II-II of FIG.

[Explanation of symbols]

1. Disc brake, 2. Caliper body, 2a, 2
b: working portion, 2c: bridge portion, 2d, 2e: body attaching portion, 2f: torque receiving portion, 2g, 2h: bolt insertion hole, 3: front fork, 3a, 3b ... caliper attaching portion, 3c, 3d ... Screw hole, 4 ... disk rotor,
5, 6 mounting bolts, 5a, 6a male thread, 5b,
6b: Shaft, 7: Cylinder hole, 8: Piston, 11: Friction pad, 11a: Lining, 11b: Back plate

Claims (2)

[Claims] 1. A bolt insertion hole is formed in a body mounting portion on a disk entry side and an exit side of a caliper body disposed across a disk rotor in a direction perpendicular to a disk axis, respectively. A caliper body for a disc brake for a vehicle, wherein a shaft portion of a mounting bolt is inserted, and an external thread of the mounting bolt is screwed into a female screw hole of a caliper mounting portion of the vehicle body, and the vehicle body mounting portion is bolted to the caliper mounting portion. A mounting structure for a caliper for a disk brake for a vehicle, wherein the mounting bolt on the disk outlet side is disposed substantially along the rotation direction of the disk rotor. 2. The mounting bolt on the disk outlet side,
2. The caliper mounting structure for a vehicle disk brake according to claim 1, wherein the caliper is mounted outside the outer peripheral surface of the disk rotor.