JP2002295540A - Disk brake - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a mounting made of cast iron at low cost and an electric erosion preventing member in a disk brake using the mounting made of cast iron and knuckle made of aluminum alloy. SOLUTION: The electric erosion preventing member 7 is comprised of a main body 7a, coming in contact with an end face 3d of a boss part 3b and a plurality of arm parts 7b expanding along an outer periphery 3c of the boss part 3b integrally formed at the main body 7a, a claw part 7c folded back at acute angle for the arm part 7b toward the outer periphery of the boss part 3b is set, and the outer periphery 3c with casting surface of the boss part 3b is supported to a plurality of the claw parts 7c.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a disk brake used as a vehicle wheel brake.

[0002]

2. Description of the Related Art In recent years, aluminum alloy parts have been frequently used for the purpose of reducing the weight of a vehicle. However, there are cases in which an aluminum alloy is used for a knuckle on a vehicle to which a disc brake is mounted. In this case, the boss of the cast iron mounting and the knuckle made of aluminum alloy come into contact with each other, but the knuckle made of aluminum alloy may be corroded by electrochemical action at the contact portion between them, and in order to avoid this, for example, Japanese Patent Laid-Open Publication No. As shown in 9-303440, there is an example in which an electrolytic corrosion preventing member is interposed between the two.

In this method, a reference surface is provided by cutting on a side surface of a disk rotor of a boss portion of a cast iron mounting, and an arc-shaped processed surface is also provided on a side surface of the boss portion. In this case, the claw portion is engaged with the arc-shaped processed surface, and the electrolytic corrosion member is attached to the boss portion.

[0004]

However, in the above prior art, the boss portion must be cut and the dimension of the locking portion in the direction of the axis of rotation of the disk rotor must be maintained with high precision. However, this leads to an increase in the cost of the mounting made of cast iron and the anti-corrosion member.

It is an object of the present invention to provide a low-cost cast iron mounting and an electrolytic corrosion preventing member in a disc brake using a cast iron mounting and an aluminum alloy knuckle.

[0006]

In order to solve the above-mentioned technical problem, as set forth in claim 1, a caliper is supported over a disk rotor so as to be movable in the rotation axis direction of the disk rotor and the disk rotor is supported. A mounting provided with a cylindrical boss having an axis in the direction of the rotation axis of the disk rotor on a surface side separated from the disk rotor; and a mounting provided on a non-rotating portion of the vehicle and connecting the mounting to a non-rotating portion on the vehicle side. A knuckle, and a disc brake including an electrolytic corrosion preventing member interposed between the boss portion and the knuckle, wherein the boss portion has an outer peripheral surface of a casting surface, and the electrolytic corrosion preventing member is A main body portion abutting on an end surface of the boss portion and a plurality of arms formed integrally with the main body portion and extending along an outer peripheral surface of the boss portion, and a tip of the arm portion has A disc brake having a claw portion bent at an acute angle to the arm portion toward the outer peripheral surface of the boss portion, wherein the plurality of claw portions grip the outer peripheral surface of the boss portion; Was configured.

According to the first aspect of the present invention, the cutting of the boss required for mounting the anti-corrosion member only needs to be performed at the end face where the anti-corrosion member comes into contact, thereby reducing the number of processing steps. Thus, a low-cost mounting can be obtained. Further, the claw portion of the anti-corrosion member may be formed with such accuracy that the outer peripheral surface of the boss portion can be gripped, and a low-cost anti-corrosion member can be obtained.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described in detail with reference to embodiments. 1 to 3 show a first embodiment of the present invention. A disc brake 1 includes a disc rotor 2 that rotates integrally with a wheel (not shown), and an inner side of the disc rotor 2 (the right side in FIG. 1). ) And an outer pad 5 arranged on the outside (left side in FIG. 1), respectively, and a knuckle 6 made of an aluminum alloy connected to a non-rotating portion of the vehicle inside the disk rotor 2.
And a mounting 3 made of cast iron, which is fixed to the knuckle 6 with bolts and directly receives the braking torque applied to both pads 4 and 5, and is supported by the mounting 3 so that the disk rotor 2 can slide in the axial direction. Caliper 1
0.

FIG. 2 shows a configuration in which the calipers are removed from FIG. The mounting 3 includes two pin boss portions 3a provided with holes for accommodating a slide pin 31, which will be described later, two boss portions 3b which are joint portions with the knuckle 6, a pin boss portion 3a and a boss portion 3b. And a first leg 3e for connecting the
A second leg 3f provided on the opposite side of the leg 3e, a first coupling portion 3g for coupling the first leg 3e and the second leg 3f,
A second connecting portion 3h for connecting the two front and rear second leg portions 3f.

The mounting 3 is fixed by a mounting bolt 22 to a knuckle 6 connected to a non-rotating part of the vehicle. An electrolytic corrosion preventing member 7 is interposed between the end face 3 d of the boss 3 b of the mounting 3 and the end face 6 a of the knuckle 6.

As shown in FIG. 3, the electrolytic corrosion preventing member 7 has a main body 7a in contact with the end face 3f of the boss 3b and the end face 6a of the knuckle 6, and a boss 3b formed integrally with the main body 7a. And three arm portions 7b of equal length extending along the outer peripheral surface 3c of the boss portion 3b. The arm portion 7b is bent toward the outer peripheral surface 3c of the boss portion 3b at an acute angle with respect to the arm portion 7b. It has a claw 7c. For this reason, attachment of the claw portion 7c to the boss portion 3b is easily performed.

The three pawls 7c are folded back toward the knuckle 6 as shown in FIGS. 1 and 2, and the diameter of the inscribed circle at the tip of the pawl is smaller than the outer diameter of the boss 3b. The outer peripheral surface 3c of the boss 3b is strongly held by the spring action, and the claw 7c is
(b) is caught on the irregularities of the casting surface on the outer peripheral surface 3c. For this reason, the mounting bolt 22 is loosened and the mounting 3
Even if the knuckle 6 and the knuckle 6 are separated, the anti-corrosion member 7 does not fall off the boss 3b.

The boss portion 3b is formed by a spring action.
Because of the simple structure of gripping the arm, it is not necessary to increase the dimensional accuracy of the arm 7b and the claw 7c, and the cylinder bore 10 ( (Not shown), and a piston (not shown) is slidably inserted in the cylinder bore in the axial direction of the disk rotor 2.

An ear 10b provided at the end of the caliper 10 in the front-rear direction (in the direction perpendicular to the plane of FIG. 1) is fixed to the head 31a of the slide pin 31 by a pin bolt 21, and the slide pin 31
Are slidably fitted into holes provided in the pin boss portions 3a at both front and rear ends of the boss.

When the brake fluid pressurized by the master cylinder (not shown) is supplied into the cylinder bore, the piston is pressed leftward by a fluid pressure corresponding to the cross-sectional area of the cylinder bore, and the piston is moved to the inner pad 4. , So that the inner pad 4 is pressed against the disk rotor 2. At the same time, the cylinder is pressed rightward by a liquid pressure corresponding to the cross-sectional area of the cylinder bore. Caliper 10 is slide pin 3
1, the disc rotor 2 is supported by the mounting 3 so that the disc rotor 2 can slide in the axial direction, so that the caliper 10 receiving the hydraulic pressure is moved rightward, and the claw 10 c of the caliper 10 is moved. The outer pad 5 is pressed, so that the outer pad 5 is pressed against the disk rotor 2. That is, when the pressurized brake fluid is introduced into the cylinder bore, the piston and the caliper 10 are pressed in opposite directions, and the inner pad 4 and the outer pad 5 are pressed against the disk rotor 2 by the piston and the claw 10c, respectively. As a result, a braking torque is generated.

Next, a second embodiment of the present invention will be described with reference to FIGS.

In FIGS. 4 and 5, the same or equivalent members as those in FIGS. 1 to 3 are denoted by the same reference numerals as those in FIGS. 1 to 3, and redundant description will be omitted.

In the second embodiment, the anti-corrosion member 10
7 is an end face 3d of the boss 3b and an end face 6a of the knuckle 6.
And a short arm portion 107b1 formed integrally with the main portion 107a and extending along the outer peripheral surface 3c of the boss portion 3b.
7a, one long arm portion 107b2 is formed integrally with and extends along the outer peripheral surface 3c of the boss portion 3b. The short arm portion 107b1 has a claw portion 107c1 that is bent toward the outer peripheral surface 3c of the boss portion 3b at an acute angle with respect to the short arm portion 107b1.
And the claw 107 bent at an acute angle to the long arm 107b2 toward the outer peripheral surface 3c of the boss 3b.
c2. For this reason, the claw portions 107c1 and 107c2
Is easily mounted on the boss 3b.

The claws 107c1 and 107c2 are folded back toward the knuckle 6 as shown in FIGS.
The diameter of the inscribed circle at the tip of the claw portion is set to be smaller than the outer diameter of the boss portion 3b, and the outer peripheral surface 3c of the boss portion 3b is strongly gripped by a spring action.
07c1 and 107c2 are hooked on the unevenness of the casting surface on the outer peripheral surface 3c of the boss 3b. For this reason, mounting bolt 2
Even if the mounting 2 is loosened and the mounting 3 and the knuckle 6 are separated, the electrolytic corrosion preventing member 107 does not fall off the boss 3b.

The boss 3b is formed by a spring action.
Arms 107b1, 107
It is not necessary to increase the dimensional accuracy of the b2 and the claw portions 107c1 and 107c2, and the low-cost anti-corrosion member 7 can be obtained. Further, in the second embodiment, the short arm portion 107b1 having two arms and one And the long arm portion 107b2, the optimum mounting position of the claw portion around the boss portion 3b can be selected, and the degree of freedom in designing the electrolytic corrosion preventing member 107 increases.

As described above, the present invention has been described with reference to the embodiments. However, the present invention is not limited to the above embodiments, but includes various embodiments according to the principle of the present invention.

In each of the above embodiments, the number of the arm portions of the anti-corrosion member is set to three. However, the number is not limited to three, and may be more than three if the number is allowable in design and production. You may. In addition, one long arm is used,
The number is not limited to this, and may be more than one as long as the number is allowable in terms of design and production.

[0023]

According to the present invention, in a disk brake using a cast iron mounting and an aluminum alloy knuckle, it is possible to provide a low-cost cast iron mounting and an electrolytic corrosion preventing member.

[Brief description of the drawings]

FIG. 1 is a front view of a disc brake according to a first embodiment of the present invention.

FIG. 2 is a partial cross-sectional view of a combined body of a mounting and a knuckle according to the first embodiment of the present invention.

FIG. 3 is a view showing an electrolytic corrosion preventing member according to the first embodiment of the present invention.

FIG. 4 is a front view of a disc brake according to a second embodiment of the present invention.

FIG. 5 is a view showing an electrolytic corrosion preventing member according to a second embodiment of the present invention.

[Description of Signs] 1 Disc brake 2 Disc rotor 3 Mounting 3b Boss 3c Outer peripheral surface 6 Knuckle 7, 107 Electrolytic corrosion prevention member 7a, 107a Main body 7b, 107b1, 107b2 Arm 7c, 107c1, 107c2 Claw 10 Caliper

Claims (1)

[Claims] 1. A cylindrical caliper that straddles a disk rotor and is movably supported in the direction of the rotation axis of the disk rotor, and has an axis in the direction of the rotation axis of the disk rotor on a surface separated from the disk rotor. A mounting provided with a boss portion, a knuckle provided on a non-rotating portion of the vehicle and connecting the mounting to a non-rotating portion on the vehicle side, and electrolytic corrosion prevention interposed between the boss portion and the knuckle. In the disc brake provided with the member, the boss portion has an outer peripheral surface of a casting surface, and the electrolytic corrosion preventing member is formed integrally with the main body portion and the main body portion that are in contact with an end surface of the boss portion. A plurality of arms extending along the outer peripheral surface of the boss portion, and the tip of the arm portion has a claw portion bent at an acute angle with respect to the arm portion toward the outer peripheral surface of the boss portion. To A disc brake having a plurality of claw portions gripping an outer peripheral surface of the boss portion.