JP2003240028A - Disk brake - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To facilitate mounting of a disk brake to a car body side, having an independent brake pad corresponding to a plurality of pistons. <P>SOLUTION: Four pistons including pistons 11A and 11B are faced to a caliper body 3 of the disk brake 1, and four independent brake pads corresponding to respective pistons are disposed. Expanding tilting surfaces 34A and 34B are formed at the lower ends of torque receiving parts 20A and 20B disposed between the adjacent brake pads in a central part of the caliper body 3. In mounting the caliper body 3 to the car body side, the outer peripheral edge of a disk rotor 2 is guided along the expanding tilting surfaces 34A and 34B of the torque receiving parts 20A and 20B and is smoothly inserted into a disk pass part 10 between the faced torque receiving parts 20A and 20B and brake pads, so that the mounting of the caliper body 3 to the car body is facilitated. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a disc brake used as a braking device for vehicles such as automobiles.

[0002]

2. Description of the Related Art Generally, a disc brake used as a braking device for a vehicle such as an automobile presses brake pads, which are arranged on both sides of a disc rotor rotating with wheels, with a piston of a hydraulic cylinder against the disc rotor. By this, braking force is generated.

In this type of disc brake, for example, as described in Japanese Utility Model Laid-Open No. 3-46026, two pistons are provided on each side of the disc rotor of the brake caliper and independent brake pads corresponding to each piston. There is known a caliper-fixed disc brake that is arranged and has a torque receiving portion that supports these brake pads and receives a braking torque.

[0004]

By the way, in the disc brake described in the above publication, torque receiving portions provided between the brake pads adjacent to each other on one side of the disc rotor are arranged on both sides of the disc rotor. When mounting the brake caliper on the vehicle body side, it is necessary to insert the disc rotor between these torque receiving portions. Therefore, it is necessary to mount the brake caliper on the vehicle body side while accurately positioning so that the torque receiving portion and the brake pad do not interfere with the disc rotor, which complicates the mounting process.

The present invention has been made in view of the above points, and an object thereof is to provide a disc brake in which a brake caliper can be easily attached to a vehicle body.

[0006]

In order to solve the above-mentioned problems, the invention according to claim 1 provides a plurality of pistons on at least one side of a disk rotor, and a plurality of independent pistons corresponding to the plurality of pistons. In a disc brake having a brake pad and a torque receiving portion for supporting each of the plurality of brake pads, the disc brake is expanded toward the center side of the disc rotor at the end portion of the torque receiving portion on the disc rotor receiving side. It is characterized in that an inclined surface is formed. With this configuration, when the disc rotor is mounted on the vehicle body, the outer peripheral edge portion of the disc rotor is guided along the inclined surface of the torque receiving portion and is inserted between the torque receiving portion and the brake pad on both sides. A disc brake according to a second aspect of the present invention is characterized in that, in the configuration of the first aspect, the inclined surface is formed with a torque receiving portion at a position sandwiched by the plurality of brake pads. With this configuration, the disc rotor is guided along the inclined surface formed on the torque receiving portion arranged from the central portion. A disc brake according to a third aspect of the present invention is the disc brake of the second aspect, wherein the torque receiving portion or the disc rotor of the brake pad is located at an outer end of the inclined surface in the radial direction of the disc rotor and both ends in the circumferential direction of the disc rotor. A radius of an arc connecting the radially inner end points is larger than a radius of the disk rotor. With this configuration, when mounted on the vehicle body, the inclined surface arranged on the center side encounters the disc rotor earlier than the torque receiving portions or the brake pads at both ends in the disc rotor circumferential direction. The inclined surface reliably guides the disc rotor. Further, a disc brake according to a fourth aspect of the present invention is characterized in that, in the configuration according to any one of the first to third aspects, a mounting portion to the vehicle body is integrally formed in the vicinity of the inclined surface. With this configuration, the heat of the brake pad is easily released to the vehicle body through the inclined surface of the torque receiving portion and the mounting portion.

[0007]

BEST MODE FOR CARRYING OUT THE INVENTION An embodiment of the present invention will be described in detail below with reference to the drawings. As shown in FIGS. 1 to 7, the disc brake 1 of the present embodiment is a fixed caliper disc brake, and the caliper body 3 includes caliper halves 3A arranged on both sides of the disc rotor 2, respectively. It has a two-piece structure that is configured by combining the caliper half body 3B.

The caliper half-split body 3A and the caliper half-split body 3B are composed of bridge portions 4A, 5A and bridge portions 4B, 5B projecting from both ends in the circumferential direction of the disk rotor 2, and the upper center. The bridge portion 6A and the bridge portion 6B which are projected to each other are butted against each other, and they are coupled to each other by tie bolts 7, 8 and 9 which are inserted into these bridge portions 4A, 5A, 4B, 5B, 6A and 6B. The caliper main body 3 forms a disc path portion 10 that straddles the disc rotor 2 by the bridge portions 4A, 4B, 5A, 5B, 6A, 6B.

The caliper halves 3A and 3B are respectively provided with two cylinders arranged along the circumferential direction of the disc rotor 2.
11A, 12A and cylinders 11B, 12B are formed at the portions facing each other, and these cylinders 11A, 12A, 11B, 12B respectively have bottomed cylindrical pistons 13A, 14A and 13B, 1B.
4B is slidably fitted. Caliper halves 3A, 3B
An oil passage 15 (only part of which is shown) communicating with the cylinders 11A and 12A and the cylinders 11B and 12B is formed in the oil passage 16 from the oil supply port 16 provided in the caliper half 3A. Brake fluid is supplied to the cylinders 11A and 12A and the cylinders 11B and 12B. A bleeder plug 17 for removing air is attached to the caliper half 3A.

The caliper halves 3A and 3B are arranged on the outer sides of the cylinders 11A and 12A and the cylinders 11B and 12B, between the cylinders 11A and 12A, and between the cylinders 11B and 12B, respectively, in the circumferential direction of the disk rotor 2. The torque receiving portions 18A, 19A, 20A and the torque receiving portions 18B, 19B, 20B are projected so as to face each other. Then, between the torque receiving portions 18A and 20A and between the torque receiving portion 1
9A and 20A, similarly, between the torque receiving portions 18B and 20B and between the torque receiving portions 19B and 20B, respectively, a substantially rectangular brake pad 21.
Pad guide grooves 23A, which guide A, 22A and 21B, 22B slidably along the axial direction and substantially radial direction of the disk rotor.
24A and 23B, 24B are formed, and the pad guide groove 23
Cylinders 11A, 12A and 11B, 12B are opened in A, 24A and 23B, 24B, respectively.

The pad guide grooves 23A, 24A and 23B, 24B are
The disk rotor 2 is slightly inclined toward the center side, and the torque receiving portions 20A, 20B between them have a substantially triangular shape. Torque receiver 20A, 2 at the center of caliper body 3A, 3B
0B is connected to the bridges 6A and 6B as a unit, and
The torque receiving portions 18A, 18B and 19A, 19B on both end sides are provided with ribs 40A, 40B and 41A, 41B which are continuous with the bridge portions 4A, 4B and 5A, 5B on both end portions to enhance rigidity. Also,
The torque receiving portions 18A, 18B, 19A, 19B, 20A, 20B are each provided with a notch 2 for ventilating along the circumferential direction of the disc rotor 2.
5A, 25B, 26A, 26B, 27A, 27B are provided.

Pin bosses 28A, 28B are formed between the bridge portions 4A, 6A and between the bridge portions 4B, 6B at the upper portions of the caliper halves 3A, 3B (on the outer peripheral side of the disc rotor 2), respectively. Pin boss 29A, between 6A and bridge part 5B, 6B
29B are formed.Pad bosses 28A, 28B and pin bosses 29A, 29B are respectively inserted and screwed, and pad pins 30, 31 are inserted into the back pads of the brake pads 21A, 21B and 22A, 22B, and the brakes are formed. Pads 21A, 21B and 22A, 2
2B is held in the caliper body 3. Also, pad pin 3
The brake pads 21A, 21B and 22A, 22B are engaged with the brake pads 21A, 21B and 22A, 22B to stabilize the positions of the brake pads 21A, 21B and 22A, 22B.
Cover spring 3 to prevent foreign matter from entering the sliding parts of
2,33 are installed.

The torque receiving portion 2 in the center of the caliper halves 3A, 3B
At the lower end of 0A, 20B (the end on the receiving side of the disk rotor 2), inclined surfaces 34A, 34B are inclined so that the lower end expands.
Are formed. The slopes 34A and 34B are the brake pads 2
When 1A, 21B and 22A, 22B are in the retracted position, the lower end portion of the portion that abuts the torque receiving portions 20A, 20B has inclined surfaces 34A, 34B.
It is formed so that it does not protrude from. As shown in FIG. 6 (only one caliper half body 3A is shown), the inclined surface 34A,
The radius R2 of the arc C connecting the disc rotor radial outer ends 34Aa, 34Bb of 34B and the disc rotor radial inner ends 21Aa, 21Bb and 22Aa, 22Bb of the brake pads 21A, 21B and 22A, 22B is the radius R2 of the disc rotor 2 Is larger than the radius R1 of. The contours of the inclined surfaces 34A and 34B may be curved, such as arcuate, in addition to the linear shape shown.

At the lower end of the caliper half 3A, mounting bosses 35 and 36 are integrally formed near the inclined surface 34A of the torque receiving portion 20A and between the cylinder 11A and the bridge portion 4A, respectively. The caliper body 3 is adapted to be attached to a non-rotating portion on the vehicle body side such as a front fork of a motorcycle or a knuckle of a four-wheeled vehicle by bolts (not shown) inserted through the mounting bosses 35 and 36. .

The operation of the present embodiment configured as described above will be described below. Brake fluid pressurized by a master cylinder (not shown) is supplied from the oil filler port 16 to each cylinder 11A,
When supplied to 11B, 12A, 12B, pistons 13A, 13B, 14A, 14B
Moves forward to press the brake pads 21A, 21B, 22A, 22B against the disc rotor 2 to generate a braking force. At this time,
The brake pads 21A, 21B, 22A, 22B are dragged by the disc rotor 2, and the torque receiving portions 20A, 20B are moved in accordance with the rotation direction thereof.
And 18A, 18B or 19A, 19B.

When the caliper main body 3 is mounted on a front fork of a two-wheeled vehicle or the like, when the disc rotor 2 is inserted into the disc path portion 10 of the caliper main body 3, the outer peripheral edge portion of the disc rotor 2 has a torque receiving portion 20A, Since the disc pass portion 10 is guided along the widened inclined surfaces 34A, 34B of the disc 20B, the disc pass portion 10 does not interfere with the lower end portions of the brake pads 21A, 21B, 22A, 22B. The caliper body 3 can be easily attached. In addition, as in the present embodiment, the inclined surfaces 34A, 34
When B is formed only in the central torque receiving portions 20A and 20B, the caliper main body 3 can be easily mounted with a minimum weight addition to the caliper main body 3.

At this time, the outer ends 34Aa, 34Bb of the inclined surfaces 34A, 34B in the radial direction of the disk rotor and the brake pads 21A, 21B.
And 22A, 22B disk rotor radial inner end points 21Aa, 21
Since the radius R2 of the arc C connecting Bb and 22Aa, 22Bb is set to be larger than the radius R1 of the disc rotor 2, the inclination that is arranged closer to the center than the brake pads 21A and 21B at both ends in the disc rotor circumferential direction. The surfaces 34A and 34B come into contact with the disk rotor 2 first, and the inclined surfaces 34A and 34B can reliably guide the disk rotor 2 and the caliper main body 3 can be easily attached. The torque receiving parts 18A, 18B and 19A, 19B at both ends in the circumferential direction of the disk rotor are
When the brake pads 21A, 21B and 22A, 22B project inward in the disc rotor radial direction, the inclined surfaces 34A,
By making the radius of the arc connecting the disc rotor radial outer ends 34Aa, 34Bb of 34B and the disc rotor radial inner ends of the torque receiving portions 18A, 18B larger than the radius R1 of the disc rotor 2, the same as above. It is possible to obtain the action and effect.

Further, since the mounting boss 35 is integrally formed in the vicinity of the inclined surface 34A of the torque receiving portion 20A, heat generated by friction between the disc rotor 2 and the brake pads 21A, 21B, 22A, 22B during braking is generated. Since it is transmitted from the brake pads 21A, 22A to the torque receiving portion 20A and is released to the vehicle body side through the mounting boss 35 integrally formed in the vicinity of the inclined surface 34A,
This heat is easily released to the vehicle body side, and heat dissipation can be improved.

In the above embodiment, the caliper body 3
When installing on the vehicle body, interference with the disc rotor 2 poses a problem. Only the central torque receiving parts 20A, 20B have inclined surfaces 34A, 34B.
In addition, the torque receiving parts 18A,
If interference between 18B and 19A, 19B and the disk rotor 2 becomes a problem, those torque receiving parts 18A, 18B and 19A, 1
An inclined surface can be formed on 9B. In short, the inclined surface should be properly formed on all the torque receiving parts, the torque receiving parts on both ends, the torque receiving part on either one of the both ends, etc. where the interference with the disk rotor 2 becomes a problem when the caliper is attached. The brake pad may be provided with an inclined surface for guiding the disc rotor 2 in the same manner.

In the above embodiment, two pistons are arranged on each side of the disc rotor 2, but the present invention also applies to those in which three or more pistons are arranged. It can be applied by forming an inclined surface in the torque receiving portion between the pistons or the torque receiving portion at the end.

In the above embodiment, the caliper fixed type and the so-called two-piece structure in which the two caliper halves 3A and 3B are joined and integrated is described. In addition to this, the caliper body is integrated 1
It can be similarly applied to a piece structure. Furthermore, the same can be applied to the caliper floating type by forming an inclined surface on the torque receiving portion provided on the carrier or the like.

[0022]

As described above in detail, according to the disc brake of the invention of claim 1, since the torque receiving portion is formed with the inclined surface, the outer peripheral edge portion of the disc rotor when mounted on the vehicle body side. Is guided along the inclined surface of the torque receiving portion and is inserted between the torque receiving portion and the brake pad on both sides, so that it can be easily attached to the vehicle body side. According to the disc brake of the invention of claim 2,
The disc rotor can be guided along the inclined surface formed on the torque receiving portion arranged in the central portion, and the mountability to the vehicle body can be improved. According to the disc brake of the third aspect of the present invention, when the disc brake is mounted on the vehicle body, the inclined surface arranged on the center side encounters the disc rotor earlier than the torque receiving portions or the brake pads at both ends in the disc rotor circumferential direction. As a result, the inclined surface can reliably guide the disk rotor, and the mountability can be improved. Further, according to the disc brake of the invention of claim 4, since the mounting portion to the vehicle body is integrally formed in the vicinity of the inclined surface, the heat of the brake pad passes through the inclined surface and the mounting portion of the torque receiving portion. Since it is easily released to the vehicle body, heat dissipation can be improved.

[Brief description of drawings]

FIG. 1 is a vertical sectional view taken along the line AA in FIG. 2 of a disc brake according to an embodiment of the present invention.

FIG. 2 is a front view of the disc brake shown in FIG.

FIG. 3 is a plan view of the disc brake shown in FIG.

FIG. 4 is a side view of the disc brake shown in FIG.

5 is a bottom view showing the disc brake of FIG. 1 with a brake pad removed. FIG.

FIG. 6 is a front view of the caliper half body with brake pads attached to the disc brake shown in FIG. 1.

7 is a BB in FIG. 2 of the disc brake shown in FIG.
It is a longitudinal cross-sectional view by a line.

[Explanation of symbols]

1 disc brake 2 disc rotor 11A, 11B, 12A, 12B piston 22A, 22B, 23A, 23B brake pads 20A, 20B Torque receiver 34A, 34B inclined surface 35 Mounting part

   ─────────────────────────────────────────────────── ─── Continued front page    F term (reference) 3J058 AA43 AA48 AA53 AA66 AA70                       AA73 AA77 AA84 AA87 BA64                       CA53 CA58 CC23 CC25 FA01

Claims (4)

[Claims] 1. A disk having a plurality of pistons arranged on at least one side of a disk rotor, a plurality of independent brake pads corresponding to the plurality of pistons, and a torque receiving portion for supporting the plurality of brake pads, respectively. In the brake, the disk brake is characterized in that an inclined surface that expands toward the center side of the disk rotor is formed at an end of the torque receiving section on the disk rotor receiving side. 2. The disc brake according to claim 1, wherein the inclined surface is formed on the torque receiving portion at a position sandwiched by the plurality of brake pads. 3. The radius of an arc connecting the outer end of the inclined surface in the radial direction of the disc rotor and the end of the torque receiving portion located at both ends in the circumferential direction of the disc rotor or the inner end of the brake pad in the radial direction of the disc rotor is the disc rotor. The disc brake according to claim 2, wherein the disc brake is larger than the radius of the disc brake. 4. The disc brake according to claim 1, wherein a mounting portion on the vehicle body side is integrally formed in the vicinity of the inclined surface.