JP2001280376A - Caliper body mounting structure of disc brake for vehicle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To increase a support rigidity force on a side remote from a vehicle body causing unnecessary behavior of a caliper body in a structure attaching a turn in side and a turn out side of a disc of the caliper body by tightening and fixing a bolt. SOLUTION: A screw screw-fitting part 13 on one side remote from the center 01 of rotation of a disc rotor 4 among two sets of screw screw-fitting parts 13, 14 on a disc turn in side and a disc turn out side is arranged closer to an inner side in the radial direction of the disc than the screw screw-fitting part 14 on the other side. A length B1 of screwing-in of the screw screw-fitting part 13 on one side is set to be larger than a length B2 of screwing-in of the screw screw-fitting part 14 on the other side.

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. The body is attached to the body, but in recent motorcycle races, etc., when replacing the friction pad at the pit stop, the caliper body mounting structure called a radial mount that has the characteristic that the caliper body can be quickly attached and detached It has been known.

In this caliper body of the radial mount type, a pair of vehicle body mounting bosses are provided on one of the working portions of the caliper body on the disk inlet side and the outlet side, respectively.
A bolt insertion hole is formed in each boss in a direction perpendicular to the disc axis, and the body mounting boss is abutted against the caliper mounting part on the vehicle body side. The caliper body is bolted to the vehicle body by screwing the screw portion into the female screw hole of the caliper mounting portion.

When a radial mount type caliper body is mounted on a front fork having a predetermined caster angle, such as a motorcycle, a caliper mounting portion is continuously formed on the front fork in a chevron shape. The body mounting part of the caliper body is abutted against the part and bolted.

[0005]

The two caliper mounting portions have different lengths because the front fork is inclined at a predetermined caster angle as described above. One of the caliper mounting portions extending long from the front fork is provided at the two caliper mounting portions. Therefore, the supporting rigidity of the caliper body from the vehicle body is lower than that of the other. As a result, the disc inflow side or the outflow side of the caliper body supported by the long caliper mounting portion slightly swings due to the braking torque, and the friction pad cannot be sufficiently pressed to exert the predetermined braking force, or the frictional force cannot be sufficiently exerted. There is a possibility that uneven wear may occur in the lining of the pad.

Therefore, the present invention is to enhance the rigidity of the support of the caliper body remote from the vehicle body, minimize the behavior of the caliper body due to the braking torque, and sufficiently exhibit the braking force set for the disc brake. It is an object of the present invention to provide a caliper body mounting structure for a vehicle brake that can be mounted.

[0007]

In order to achieve the above object, according to a first aspect of the present invention, a bolt is provided on each of the mounting portions of the working portion disposed on one side of the disk rotor on the disk inlet side and on the outlet side of the body. An insertion hole is formed in a direction perpendicular to the disc axis, a shaft portion of a mounting bolt is inserted into the bolt insertion hole, and an external thread of the mounting bolt is screwed into a female screw hole of a caliper mounting portion of the vehicle body. In a caliper body mounting structure for a vehicle disk brake in which a mounting portion is bolted to the caliper mounting portion, the caliper body mounting structure includes two sets of screwed portions on the disk revolving side and the disk revolving side.
One of the threaded portions far from the center of rotation of the disk rotor is disposed closer to the inside in the disk radial direction than the other threaded portion. In the second invention, the screwed length of one screwed portion of the first invention is set longer than the screwed length of the other screwed portion.

[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.

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

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. The caliper body 2 is formed in a six-pot piston-facing type in which a large-diameter or small-diameter piston 8 is accommodated in the hole 7, and the caliper body 2 is formed in one action portion 2 a disposed on one side of the disk rotor 4. The vehicle body mounting portions 2d and 2e thus mounted are mounted on the caliper mounting portions 3a and 3b integrally formed on the disk reversing side of the front fork 3 inclined at a predetermined caster angle using mounting bolts 5 and 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 11b, and a hanger pin 1 is provided on an upper portion of the back plate 11b.
0 and 10 are inserted and supported so as to be movable in the disk axis direction.

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 portions 2d, 2 of the caliper body 2
e is a radial line L connecting the rotation center O1 of the disk rotor 4 and the pad pressing center O2 of the caliper body 2 to the disk inlet side and the disk outlet side of one of the action portions 2a.
It is formed on a boss portion that is built up in parallel with 1. Of these, the vehicle mounting portion 2d on the disk retraction side disposed apart from the front fork 3 is located at a distance inward in the disk radial direction from the vehicle mounting portion 2e on the disk retraction side provided close to the front fork 3. L2, which are longer than the shaft diameters of the mounting bolts 5 and 6 in the vehicle body mounting portions 2d and 2e.
f and 2g are formed in parallel with the above-mentioned disk radial direction line L1 orthogonal to the disk axis.

The caliper mounting portions 3a and 3b on the vehicle body side
As described above, the front fork 3 is fixed to the predetermined caster with respect to the caliper body 2 which is formed so as to protrude continuously from the front fork 3 toward the disk inlet side and is disposed orthogonal to the disk radial direction line L1. Since the angle of the caliper body 2 is set to be different from that of the caliper body 2 by the distance L2 as described above, the caliper mounting part 3a on the disc reciprocating side is Of the vehicle body mounting portion 2 rather than the caliper mounting portion 3b
The caliper mounting portion 3 is formed to be shorter inward in the radial direction of the disk by the distance L2 between d and 2e,
a of the caliper mounting portion 3b on the disc outlet side
Is located radially inward of the disc surface with respect to the bearing surface 3f.

That is, the caliper mounting portion 3a on the disk revolving side and the caliper mounting portion 3b on the disk revolving side are separated from the rotation center O1 of the disk rotor 4 by the caliper mounting portion 3a.
The distance from the center of rotation O1 of the disk rotor 4 to the seating surface 3e of the caliper mounting portion 3b
When the distance to f is the distance L4, the relationship is set to L4 = L2 + L3.

The above-mentioned caliper mounting portions 3a and 3b include:
The female screw holes 3c, 3d parallel to the disk radial direction line L1 orthogonal to the disk axis are provided with the bolt insertion holes 2f, 2g.
And the effective thread of the female screw hole 3c on the disk entry side is larger than that of the conventional female screw hole 3d on the disk exit side set to the same length as the conventional one. Are formed even longer.

The mounting bolts 5 for the disk inlet side include:
A bolt longer than the mounting bolt 6 for the disk rewinding side is used, and a male thread portion 5a slightly longer than the effective thread portion of the female screw hole 3c is formed at the tip of the mounting bolt 5 for the disk rewinding side. At the same time, a male screw portion 6a slightly longer than the effective screw portion of the female screw hole 3d of the mounting bolt 6 on the disc outlet side is formed.

The caliper body 2 includes a vehicle body mounting portion 2d,
The lower side of 2e is the seating surface 3e of the caliper mounting portions 3a, 3b.
3f, the two bolt insertion holes 2f, 2g and the female screw holes 3c, 3d are aligned, and the shaft of the mounting bolt 5 is inserted from the outside of the disk insertion side bolt insertion hole 2f, and the disk ejection side. Insert the shaft of the mounting bolt 6 from the outside of the bolt insertion hole 2g of
The caliper body 2 is mounted on the caliper mounting portions 3a and 3b of the front fork 3 by screwing the a and 6a into the female screw holes 3c and 3d, respectively.

By this screwing, on the disk reciprocating side of the caliper body 2, the effective screw portion of the female screw hole 3c and the male screw portion 5a screwed into the same are used to form a screw screw portion having a screwing length B1 longer than usual. 13 is set, and on the disk reciprocating side, a screw screwing portion 14 having a substantially normal screwing length B2 is set from the effective screw portion of the female screw hole 3c and the male screw 6a screwed thereto.

The caliper body 2 is fixed to the vehicle body in this manner. However, the above-mentioned threaded engagement between the externally threaded portions 5a, 6a of the disk inlet and outlet sides and the female screw holes 3c, 3d,
Body mounting portions 2d and 2e and caliper mounting portions 3a and 3
According to the setting of b, the screw threaded portion 14 having a substantially normal screwing length B2 is provided on the disk outlet side, whereas the screw screwing length B1 longer than normal is provided on the disk inlet side. The screw threaded portion 13 is disposed radially inward of the disk threaded portion 14 on the disk exit side, that is, closer to the rotation center O1 of the disk rotor 4.

Since the screw threaded portion 13 on the disk reciprocating side is disposed close to the disk radially inner side as described above, the support rigidity from the front fork 3 acts greatly, and the braking torque is reduced. The resulting behavior of the caliper body 2 is suppressed as much as possible. As a result, the friction pad 1
Thus, it is possible to solve the problems that the predetermined braking force cannot be sufficiently exerted by biasing 1 and the lining 11a of the friction pad 11 is unevenly worn. Also, the seating surface 3e of the caliper mounting portion 3a on the disk reciprocating side
Is closer to the front fork 3,
Since the amount of protrusion of the caliper mounting portion 3a on the disk revolving side, which is relatively large in comparison with the revolving side of the disk, is smaller than the distance L6 at the conventional position, the distance L5 is smaller. It also contributes to the improvement of the rigidity around the portion 3a.

Further, in this embodiment, since the screwing length B1 longer than usual is set to the screw threaded portion 13 on the disk entry side, the behavior of the caliper body 2 due to the braking torque is further suppressed, and the braking force is reduced. While fully exerting
The uneven wear of the lining 11a is more reliably prevented, and the durability of the friction pad 11 can be further extended.

The caliper body mounting structure of the present invention can be applied not only to the front fork disk inlet side shown in the embodiment but also to the front fork disk outlet side and the rear swing arm. In addition, the present invention, besides bar handle vehicles including motorcycles,
It can be widely applied to automobiles with four or more wheels.

The mounting bolt of the caliper body is
If it is perpendicular to the disk axis, it does not necessarily need to be parallel to the disk radial direction line passing through the pad pressing center of the caliper body shown in the embodiment, for example, it may be oriented in the disk radial direction or other directions. Absent.

[0025]

As described above, according to the structure of the first aspect of the invention, the behavior of the caliper body caused by the braking torque can be suppressed as much as possible. Conventional problems such as insufficient performance and uneven wear of the lining of the friction pad can be eliminated as much as possible. In addition, since the position of the caliper mounting portion on the disk retrieving side is closer to the front fork than before, and the rigidity around the caliper mounting portion on the disk recirculating side is improved, the mounting strength of the caliper body is increased. Furthermore, since the length of the vehicle body mounting portion, the caliper mounting portion, the length and the position of the connecting bolt and the female screw hole need only be changed from the conventional structure, it can be implemented at extremely low cost and high practicability can be obtained. .

According to the structure of the second aspect of the invention, the behavior of the caliper body due to the braking torque can be further suppressed, so that a more sufficient braking force can be exhibited, and uneven wear of the lining can be more reliably prevented. As a result, the durability of the friction pad can be further extended.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view of a main part showing a mounting structure 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 mounting portion, 2f, 2g: bolt insertion hole, 3: front fork, 3a, 3b: caliper mounting portion, 3c, 3d: female screw hole, 4: disk Rotor, 5, 6 ... mounting bolt, 5
a, 6a: male thread portion, 5b, 6b: shaft portion, 7: cylinder hole, 8: piston, 11: friction pad, 13: screw threaded portion having a threaded length B1, 14 ... screw thread having a threaded length B2 Joint part, L1 ... disk radial direction line, B1 ... female screw hole 3
The screwed length between c and the external thread 5a, B2 ... female screw hole 3
d: length of screwing between male thread 6a, O1: center of rotation of disk rotor 4

Claims (2)

[Claims] 1. A bolt insertion hole is formed in a vehicle mounting portion on a disk inlet side and an outlet side of a working portion disposed on one side of a disk rotor, respectively, in a direction perpendicular to the disk axis.
For a vehicle for inserting a shaft portion of a mounting bolt into the bolt insertion hole and screwing a male thread portion of the mounting bolt into a female screw hole of a caliper mounting portion of the vehicle body, thereby bolting the vehicle body mounting portion to the caliper mounting portion. In the caliper body mounting structure for a disc brake, one of the two sets of screw engagement portions on the disk inlet side and the disk outlet side, which is farther from the rotation center of the disk rotor, is connected to the other screw engagement portion. A caliper body mounting structure for a disc brake for a vehicle, wherein the caliper body is mounted closer to a radially inner side of the disc than the portion. 2. The caliper body for a vehicle disk brake according to claim 1, wherein the screwed length of the one screwed portion is set longer than the screwed length of the other screwed portion. Mounting structure.