JPH081303Y2 - Disc brake - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial application] The present invention relates to a disc brake.

[Prior Art] Generally, a so-called brake squeal phenomenon that occurs when a brake is actuated is considered to occur when a bending mode of a brake pad and a combination mode of deformation of a claw portion formed on a caliper match. ing.

However, in the conventional disc brake,
Since it is necessary to allow the bite to escape when processing the cylinder into the caliper, the claws can be provided only at both ends, and the brake squeal phenomenon cannot be prevented.

For this reason, the applicant of the present utility model has proposed the disc brake shown in Japanese Patent Application No. 2-50681 (Japanese Utility Model Laid-Open No. 4-10132) as a disc brake in which the brake squeal phenomenon is less likely to occur.

This disc brake will be described with reference to FIGS.

In the figure, reference numeral 1 is a caliper (two-piece type caliper). The caliper 1 is composed of a claw caliper part 2 and a cylinder bore caliper part 3,
The claw caliper section 2 and the cylinder bore caliper section 3 are connected by a plurality of tie bolts 4, 4, ....

The cylinder bore caliper portion 3 of the caliper 1 is formed with one cylinder 12 in which a piston 11 opposed to one side surface Da of the disc plate D via a brake pad 6a is slidably fitted. Further, the claw carrier portion 2 of the caliper 1 has the other side surface of the disc plate D at the tip thereof.
Three claw portions 7, 7, 7 are formed to face Db via the brake pad 6b.

The caliper 1 thus configured is supported by the carrier (vehicle fixing member) 5 via the slide pins 8 and 8 so as to be slidable in a direction crossing the disk plate D in a position across the disk plate D. ing.

A window A is formed in the bridge portion 2a of the claw caliper portion 2 across the disc plate D to inspect the wear state of the brake pads 6a and 6b and to improve heat dissipation from the inside of the bridge portion 2a. Has been done.

According to the disc brake having the above structure, when the brake oil is supplied from the master cylinder (not shown) connected to the pipe portion 9, the piston 11 in the cylinder bore caliper portion 3 moves in the disc plate D direction, The piston 11 and one side Da of the disc plate D are pressed. Along with this, the entire caliper slides in the direction of arrow a in the figure, and the brake pads 6b are pressed against the other side surface Db of the disc plate D by the pawl portions 7, 7, 7 formed on the pawl caliper portion 2. Is clamped by the brake pads 6a, 6b and braked.

According to the disc brake having the above-described structure, since the three claw portions 7, 7, 7 are formed on the claw caliper portion 2, the combination mode of deformation of the claw portions 7, 7, 7 is There are many types, and it is possible to extremely reduce the number of matches with the bending modes of the brake pads 6a and 6b, and it is possible to make the brake squeal phenomenon less likely to occur.

[Problems to be Solved by the Invention] By the way, as described above, when the three claw portions 7, 7, 7 are formed in the claw caliper portion 2, it is possible to prevent the brake squeal phenomenon from occurring, but on the other hand, There is a problem in that the weight increases due to the provision of the three claw portions 7, 7, 7.

The present invention has been made in view of the above circumstances, and an object thereof is to provide a disc brake capable of reducing the squeal phenomenon without increasing the weight.

[Means for Solving the Problems] A disc brake according to the first invention is a two-piece type caliper composed of a cylinder hore caliper portion and a claw caliper portion, and the caliper is slidable in a direction intersecting with a disc plate. And a vehicle fixing member that supports the disc plate at a position straddling the disc plate, and a window is formed in a substantially central portion of the bridge portion of the pawl caliper portion that straddles the disc plate so as to face the disc plate. In the disc brake, the caliper is formed with three claws, and the claw at the center of the claw is thinner and narrower than the claws at both ends, or the claws at both ends. It is characterized in that it is formed thin or its width is short.

A disc brake according to a second invention is a two-piece type caliper composed of a cylinder hore caliper portion and a claw caliper portion, a position where the caliper is slidable in a direction intersecting with the disc plate and straddles the disc plate. In the disc brake, which is formed of a vehicle fixing member that is supported by the vehicle, and has a window formed in the bridge portion of the claw caliper portion that straddles the disc plate so as to face the disc plate. Book claws are formed, thin portions that connect the claws are provided between the claws, and claw pieces that project toward the brake pad are formed in the middle of the thin claws. It is characterized by

[Operation] According to the disc brake of the first invention, the central claw portion is formed to be thinner and shorter than the claw portions at both ends, or thinner or shorter than the claw portions at both ends. Therefore, it is possible to prevent the brake squeal phenomenon from occurring without increasing the weight of the disc brake itself.

According to the disc brake of the second invention, since the claw piece is projected only on the brake pad side in the middle portion of the thin portion, the brake squeal phenomenon is less likely to occur without increasing the weight of the disc brake itself. can do.

[Embodiment] A first embodiment of the disc brake of the present invention will be described below with reference to FIG.

The same parts as those of the conventional example are designated by the same reference numerals and the description thereof will be omitted.

As shown in the figure, the claw caliper portion 2 of this disc brake is formed with three claw portions 7, 7, 7.
The claw 7a at the center of the claws 7, 7, 7 of the book is the claws 7b, 7b at both ends.
The thickness is smaller than that.

In other words, since the window A is formed in the bridge portion 2a of the pawl caliper portion 2 at a position facing the side surfaces of the brake pads 6a and 6b in the substantially central portion thereof, the rigidity of the pawl portion 7a is high. Since it is lower than 7b, 7b, it is formed in the claw portion 7a having a thickness suitable for its rigidity.

Further, as described above, even if the thickness of the central claw portion 7a is thin, it is possible to exhibit the function corresponding to the rigidity thereof.

That is, according to the disc brake having the above structure, the three claw portions 7a, 7b, and 7b are formed to have thicknesses corresponding to their respective rigidity, so that the brakes are activated by functioning efficiently. The so-called brake squealing phenomenon that occurs at this time can be made less likely to occur.

Further, since the central claw portion 7a is formed thin, it is possible to reduce the weight of the whole as compared with the conventional disc brake.

In addition, what is shown in FIG. 2 is one in which thin-walled portions 21 and 21 for connecting the claw portions 7a and 7b and 7b are provided between the claw portions 7a and 7b and 7b of the first embodiment described above. Is.

As described above, according to the disc brake in which the thin portions 21, 21 are provided between the claw portions 7a and 7b, 7b, respectively,
Similar to the disc brake of the above embodiment, the brake squeal phenomenon can be made less likely to occur without increasing the weight of the disc brake itself, and each claw portion
By increasing the rigidity of 7a and 7b, 7b by the thin-walled parts 21, 21,
Vibrations of 7a, 7b and 7b can be suppressed.

In addition, in this embodiment, the thickness of the claw portion 7a is described as being thin, but the width of the claw portion 7a may be shorter than the claw portions 7b, 7b at both ends, or both of them may be used. They may be combined (thinness may be thin and width may be short).

Next, a second embodiment will be described with reference to FIGS. 3 and 4.

As shown in the figure, the pawl caliper portion 2 of the disc brake is formed with two pawl portions 7b, 7b, and the pawl portion 7b is located between the two pawl portions 7b, 7b. A thin-walled portion 22 that connects the 7b to each other is formed. In addition, a claw piece 7a 'protruding only to the brake pad 6b side is formed in an intermediate portion of the thin portion 22.

According to the disc brake having the above structure, the claw portion
Since the thin portion 22 formed between the 7b and 7b is formed with the claw piece 7a ′ protruding only to the brake pad 6b side,
Similar to the first embodiment, the brake squeal phenomenon can be made less likely to occur without increasing the weight of the disc brake itself. Further, since the portion of the thin portion 22 where the claw piece 7a ′ is not formed does not come into contact with the contact surface 6b ′ of the brake pad 6b, when the brake is operated,
It is possible to prevent the brake pad 6b from being adversely affected by the unevenness of the contact surface 6b ', and as a result, it is possible to prevent uneven contact of the brake pad 6b and prevent uneven wear.

In addition, in the above embodiment, the claw portion 7a has the center (first
In the figure, the cylinder is in the direction perpendicular to the paper surface.
Although it is arranged so as to be orthogonal to the center line of 12, and the claw portions 7b, 7b are arranged symmetrically with respect to the center line of the claw portion 7a,
The center line of the claw 7a is offset from the center line of the cylinder 12, the claws 7b and 7b are arranged asymmetrically with respect to the center line of the claw 7a, and the rigidity of the claws 7b and 7b is increased or decreased. You may.

[Effects of the Invention] As described above, according to the disc brake of the present invention, the following effects can be obtained.

． The central claw is thinner and shorter than the claws at both ends, or thinner or narrower than the claws at both ends, so the brake can be operated without increasing the weight of the disc brake itself. The so-called squealing phenomenon that occurs when it is made possible can be made less likely to occur.

.In the middle part of the thin part formed between the two claw parts,
Since the claw pieces are projected only on the brake pad side, the brake squeal phenomenon can be made difficult to occur without increasing the weight of the disc brake itself.

[Brief description of drawings]

1 to 4 are views for explaining an embodiment of the disc brake of the present invention. FIG. 1 is a sectional view of a claw portion of the disc brake of the first embodiment, and FIG. FIG. 3 is a sectional view of a claw portion of the disc brake of the embodiment, FIG. 3 is a perspective view of a claw caliper portion of the disc brake of the second embodiment, and FIG. 4 is a sectional view of a claw portion of the disc brake of the second embodiment. Is. 5 to 8 are views for explaining a conventional disc brake. FIG. 5 is a front view of the disc brake, FIG. 6 is a plan view of the disc brake, and FIG. 7 is a diagram of the disc brake. FIG. 8 is a side sectional view and FIG. 8 is a sectional view of the claw portion. 1 ... Caliper, 2a ... Bridge part, 5 ... Carrier (vehicle fixing member), 6a, 6b ... Brake pad, 7, 7a, 7b
...... Claw part, 7a '…… Claw piece, 22 …… Thin part, A …… Window, D
...... Disc plate.

Claims (2)

[Scope of utility model registration request] 1. A two-piece type caliper composed of a cylinder hore caliper part and a claw caliper part, and a vehicle supporting the caliper slidably in a direction intersecting with the disk plate and at a position across the disk plate. A disc brake comprising a fixing member and a window formed facing the disc plate at a substantially central portion of a bridge portion of the pawl caliper portion straddling the disc plate, wherein the caliper has three pawl portions. The claw portion at the center of the claw portion is formed to be thinner and shorter in width than the claw portions at both ends, or thinner or shorter in width than the claw portions at both ends. Characteristic disc brake. 2. A two-piece type caliper composed of a cylinder hore caliper part and a claw caliper part, and a vehicle which slidably supports the caliper in a direction intersecting with the disk plate at a position across the disk plate. A disc brake comprising a fixing member and a window formed facing the disc plate at a substantially central portion of a bridge portion of the pawl caliper portion straddling the disc plate, wherein the caliper has two pawl portions. Is formed, a thin portion that connects the claw portions to each other is provided between the claw portions, and a claw piece that protrudes toward the brake pad is formed in the middle portion of the thin claw portion. Characteristic disc brake.