JP3533760B2 - Disc brake and method of manufacturing the same - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a disc brake mainly applied to a vehicle braking device and a manufacturing method thereof.

[0002]

2. Description of the Related Art As a disc brake applied to a vehicle braking system, one shown in FIG. 6 has been conventionally known.
The disc brake shown in FIGS. 6A and 6B has a pressing surface 1 on which the cylinder member 101 presses the disc pad 102.
01a, the pressing surface of the disc pad 10
2 as a flat slope, the disc pad 102
As shown by the hatched portion P in FIG. 6 (b), the pressing portion is limited to the central portion of the outer periphery of the disk pad 102.
The so-called "brake squeal" when the disc brake operates is reduced. It has been found that the configuration shown in FIG. 6 is mainly effective for low frequency "brake squeal".

On the other hand, as a disc brake effective against high frequency "brake squeal", it is practically fair 2-2593.
The one shown in No. 8 was also known. This is because the pressing surface provided on the reaction part of the cylinder member to press both ends of the disk pad is not uniform.

None of the above-mentioned prior arts is effective for both "low-frequency" and "high-frequency""brakesqueal". If both are attempted at the same time, the pressing surface against the disk pad will have a complicated shape. As a result, the pressing surface processing steps are complicated and complicated, which increases the manufacturing cost of the disc brake. Further, it is necessary to incline the cylinder member when processing the pressing surface with respect to the process of processing the other parts of the cylinder member, which is not suitable for continuous processing using a transfer machine.

[0005]

SUMMARY OF THE INVENTION An object of the present invention is to provide a low-cost disc brake capable of reducing high-frequency and low-frequency brake squeal and a method for manufacturing the same.

In order to solve the above-mentioned problems, a mounting member fixed to a non-rotating member of a wheel and a disk rotor fixed to the wheel by being attached to the mounting member and moving in the wheel rotation axis direction are mutually attached. An inner disc pad and an outer disc pad to be sandwiched, a cylinder portion containing a piston that presses the inner disc pad by moving in the wheel rotation axis direction, and the outer disc pad that receives a reaction force due to the movement of the piston A reaction part for pressing the disk brake, the reaction part of the cylinder member has a pressing surface for pressing the outer disk pad, the pressing surface is the rotating shaft of the disk rotor. Formed by a conical surface with the central axis Rutotomoni, said conical surface the center
And a disc brake characterized by close of Rukoto the disk rotor with increasing distance from the axis.

Further, according to a second aspect of the present invention, the mounting member fixed to the non-rotating member of the wheel and the disk rotor mounted to the mounting member and fixed to the wheel by moving in the wheel rotation axis direction are mutually disposed. An inner disc pad and an outer disc pad to be sandwiched, a cylinder portion containing a piston that presses the inner disc pad by moving in the wheel rotation axis direction, and the outer disc pad that receives a reaction force due to the movement of the piston In the method of manufacturing a disc brake including a cylinder member including a reaction portion that presses, the reaction portion of the cylinder member includes a pressing surface that presses the outer disk pad, and the pressing surface of the disk rotor is rotating the rotary shaft as a central axis <br/> As both away from the central axis
And a disc- shaped cutter that is close to the disc rotor .

[0008]

[Action] In the disc brake according to the configuration shown in claim 1 described above, Rutotomoni pressing surface for pressing the brake pad is formed by a conical surface whose central axis coincides with the rotation axis of the disk rotor, the conical surface is the central axis Stay away from
Since it is formed so as to become closer to the disc rotor as it goes, it is possible to press the central portion and both end portions of the outer periphery of the disc pad, so that it is possible to reduce low-frequency and high-frequency brake squeal.

[0009] Also, in the manufacturing method for a disk brake according to the configuration shown in claim 2, the disk B as pressing surface for pressing the brake pad moves away from the central axis while rotating around axis the rotation axis of the disk rotor
Since it is formed by a conical cutter that is close to the rotor, it can be performed in a single step when forming the pressing surface, and the pressing surface can be processed in other parts of the cylinder member for the processing step. It is not necessary to incline the cylinder member during machining, and it can be applied to continuous machining using a transfer machine.

[0010]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a front view of a disc brake 1 according to the present invention, and FIG. 2 is a sectional view taken along line AA of FIG. In FIG. 1, a disc brake 1 has a mounting 2, which is fixed to a non-rotating member of a wheel (not shown) through a mounting hole 2a.
A cylinder body 3 is attached to the mounting 2 so as to be movable in the rotation axis direction of the wheel, and a seal member 3b is inserted into the cylinder portion 3a of the cylinder body 3 and installed on the cylinder portion 3a. A piston 4 that forms a pressure chamber 3c that is cut off from the inside, a inner disk pad 5 that is attached to the mounting 2 so as to be movable in the rotation axis direction of the wheel, and a disk rotor (not shown) that rotates with the wheel are sandwiched. The outer disc pad 6 is provided so as to face the inner disc pad 5. The outer disc pad 6 is attached to the mounting 2 by inserting the protrusion 6a into the recess 2b provided in the mounting 2 as shown in FIG. Although not shown, the inner disc pad 5 is also mounted in the same manner. A boot 7 is installed between the cylinder portion 3a and the outer peripheral portion of the piston 4 to prevent mud and water from entering the pressure chamber 3c.

The outer disc pad 6 is in contact with the reaction portion 3d of the cylinder body 3 via a shim plate 8, while the inner disc pad 5 is in contact with the piston 4 via a shim plate 9. There is.

With the above structure, when a brake operating member (not shown) of the vehicle is operated, brake hydraulic pressure is introduced into the pressure chamber 3c from a master cylinder (not shown), and the piston 4 is moved to the left in FIG. 2 by the hydraulic pressure. By moving toward the inner side, the inner disk pad 5 is pressed toward the disk rotor (not shown) through the shim plate 9.

On the other hand, the cylinder body 3 is moved to the right in FIG. 2 by the hydraulic pressure introduced into the pressure chamber 3c, and the reaction portion 3d of the cylinder body 3 causes the shim plate 8 to intervene. The outer disc pad 6 is pressed toward the disc rotor. Therefore, the disc rotor has the disc pads 5 from both sides.
It is clamped by 6 and gives a braking force to the wheels.

FIG. 3A is a simplified diagram emphasizing the shape of the pressing surface 3da of the reaction portion 3d that presses the outer disk pad 6, and the broken line portion in FIG. 3A is shown in FIG. 3B. XX cross section of FIG. Further, FIG. 4 is a diagram showing a method of processing the pressing surface 3da of the reaction part 3d, and the solid line in FIG. 4 (a) is the Y of FIG. 4 (b).
The -Y section is shown, and the broken line shows the ZZ section of FIG. Here, as shown in FIG. 4, in the step of processing the pressing surface 3da, the cone shown in FIG. 5 is centered on the position where the rotation center of the wheel or the disc rotor is assumed when the disc brake 1 is mounted on the vehicle. The cutter 10 is rotated and formed by the first cutting tool 10a on the inclined surface of the cutter 10. The second bite 10b of the cutter 10 is a plane 3db shown in FIG. 4 (a).
Is formed.

Therefore, as shown in FIG.
The inclination of 3da1 showing the YY cross section in (b) is steeper than the inclination of 3da2 showing the ZZ cross section. Therefore, in other words, of the pressing surface 3da, the portion represented by the hatched portion S in FIG. 3B is closer to the disc rotor (not shown) than the other portions of the pressing surface 3da. Therefore, the disc pad 6 has the pressing surface 3da.
Is pressed by the portion represented by the hatched portion S, that is, the portion that contacts the outer peripheral portion of the disk pad 6, and both ends of the reaction portion 3d. Therefore, it is effective in reducing brake squeal at high and low frequencies.

Further, according to the method for manufacturing a disc brake using the above-mentioned conical cutter 10, the pressing surface can be formed in a single step, and the other parts of the cylinder body can be formed. It is not necessary to incline the cylinder body when processing the pressing surface with respect to the processing process, and can be applied to continuous processing using a transfer machine.

[0018]

As described above, according to the disc brake of the present invention, it is possible to reduce high-frequency and low-frequency brake squeal, so that a comfortable disc brake can be provided.

According to the disc brake manufacturing method of the present invention, the pressing surface can be formed in a single step, and it is not necessary to tilt the cylinder member when processing the pressing surface. It is possible to reduce the cost of disc brakes in machines and the like.

[Brief description of drawings]

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

FIG. 2 is a sectional view taken along line AA of FIG.

FIG. 3 is a simplified diagram showing a state when the reaction portion of the disc brake of the present invention presses the disc pad.

FIG. 4 is a simplified diagram showing a state when processing a reaction portion of the disc brake of the present invention.

FIG. 5 is a perspective view of a cutter used in the disc brake manufacturing method of the present invention.

FIG. 6 is a simplified diagram showing a state where a reaction portion of a conventional disc brake presses a disc pad.

[Explanation of symbols]

1 disc brake 2 mounting 3
Cylinder body 3a Cylinder part 3d Reaction part 3da
Pressing surface 4 Piston 5 Inner disc pad 6 Outer disc pad 10 Conical cutter

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Claims (2)

(57) [Claims] 1. A mounting member fixed to a non-rotating member of a wheel, and an inner disc pad and an outer member which are attached to the mounting member and sandwich a disc rotor fixed to the wheel by moving in the wheel rotation axis direction. A disc pad, a cylinder portion having a built-in piston that pushes the inner disc pad by moving in the wheel rotation axis direction, and a reaction portion that receives a reaction force by the movement of the piston and pushes the outer disc pad. In a disc brake including a cylinder member including, a reaction portion of the cylinder member includes a pressing surface that presses the outer disk pad, and the pressing surface is a conical surface having a rotation axis of the disk rotor as a central axis. It is formed by Rutotomo
In addition, the conical surface becomes
Disc brake characterized by close of Rukoto the disc rotor. 2. A mounting member fixed to a non-rotating member of a wheel, and an inner disc pad and an outer member which are attached to the mounting member and sandwich a disc rotor fixed to the wheel by moving in the wheel rotation axis direction. A disc pad, a cylinder portion having a built-in piston that pushes the inner disc pad by moving in the wheel rotation axis direction, and a reaction portion that receives a reaction force by the movement of the piston and pushes the outer disc pad. In a method of manufacturing a disc brake including a cylinder member, the reaction portion of the cylinder member includes a pressing surface that presses the outer disk pad, and the pressing surface has a rotation axis of the disk rotor as a central axis. wherein with rotating
Closer to the disk rotor as it moves away from the central axis
A method for manufacturing a disc brake, which is characterized in that the disc brake is formed by a conical cutter.