JPH0749085Y2 - Caliper body for disc brakes for hydraulic vehicles - Google Patents

Description

[Detailed description of the device]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a caliper body of a hydraulic disc brake mounted on a vehicle such as a four-wheeled vehicle or a motorcycle. The structure of the caliper body divided into hydraulic systems.

[0002]

2. Description of the Related Art As a two-system type caliper body in which a hydraulic pressure path of the caliper body is divided into two, for example, JP-A-62-62
There is one disclosed in Japanese Patent Publication No. 26183.

This technique is exclusively for a front brake of a motorcycle, and a cylinder hole operated by a brake lever and a cylinder hole operated by a brake pedal are provided in parallel in an action portion arranged on a side portion of a disc rotor. The front brake can be operated not only by the brake lever but also by the brake pedal that operates the rear brake, and the cylinder hole operated by the brake lever is formed to have a larger diameter than the cylinder hole operated by the brake pedal. As a result, even when the braking operation is performed only by the brake lever, the braking force required for the front brake can be obtained.

[0004]

In such a structure, when the front brake is operated by either the brake lever or the brake pedal, the friction pad is biased on the disc turn-in or turn-out side. Since the parts are pushed, uneven wear of the friction pad is unavoidable.

From the above, the cylinder hole has three
In the case of a plurality of two or more, it is desirable to systematically divide the cylinder hole into two hydraulic paths so that uneven wear does not occur in the friction pad, so that the pad pressing force of the piston acts in a well-balanced manner. The shape of the liquid passage that connects the cylinder holes of each system is complicated and difficult to process,
High costs were unavoidable.

The present invention has been made in view of such circumstances, and an object thereof is to divide these cylinder holes into two systems in a well-balanced manner even when there are three or more cylinder holes. Therefore, it is another object of the present invention to provide a caliper body structure that can prevent uneven wear of the friction pad as much as possible and can easily provide a liquid passage hole between the cylinder holes at low cost.

[0007]

In order to achieve the above-mentioned object, the present invention is provided with three or more cylinder holes, which are open to the disk rotor side, in the action portion arranged on the side portion of the disk rotor. In a caliper body of a hydraulic vehicle disc brake, which is arranged side by side in the disc circumferential direction and pushes the pistons inserted in the respective cylinder holes by the pressurized hydraulic fluid supplied to the hydraulic chamber at the bottom of the cylinder holes, A disk in which a deep-bottomed cylinder hole including at least two on both sides of the plurality of cylinder holes and another shallow-bottomed cylinder hole shallower than the deep-bottomed cylinder hole pass through the center of the disk rotor and the thrust center point of these cylinder holes. The bottom wall portion of the shallow bottom cylinder hole is thickly arranged so as to be symmetrical with respect to the radial line, and the bottom wall portion of the shallow bottom cylinder hole communicates with the deep bottom cylinder hole. Drill holes Te is characterized in that divided into two hydraulic system.

[0008]

With this structure, the liquid passage hole connecting the plurality of deep bottom cylinder holes is formed by linearly penetrating the bottom wall of the shallow bottom cylinder hole. Further, by combining the two types of long and short cylinder holes as described above, when each hydraulic system is operated independently, the respective pad pressing forces act symmetrically with the thrust center therebetween.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below based on the illustrated embodiments.

The disc brake 1 shown in the first embodiment of FIGS. 1 to 3 is for a front brake of a motorcycle, and is a caliper bracket fixed to the vehicle body at one side of a disc rotor 2 rotating in the direction of arrow A. 3, a caliper body 6 that is cantilevered on the bracket 3 through a pair of sliding pins 4 and 5, and a pair of friction pads 7 and 7 that are disposed opposite to each other on both sides of the disc rotor 2. There is.

The caliper body 6 is a three-pot two-system type in which three cylinder holes 9, 9, 10 are divided into two hydraulic pressure paths, and an operating portion 6 disposed on both sides of the disk rotor 2 is used.
A and the reaction portion 6b are connected by a bridge portion 6c that straddles the outer circumference of the disc rotor 2. Action part 6
Mounting arms 6d and 6e are provided on a, and the caliper body 6 is supported by the above-mentioned sliding pins 4 and 5 so as to be movable in the disc axial direction.

The above-mentioned friction pads 7, 7 are arranged so as to oppose each other with the disc rotor 2 interposed between the action portion 6a and the reaction portion 6b. Each friction pad 7 has a lining 7a
And a back plate 7b are joined to each other, and a hanger pin 8 which is laid horizontally across the disc rotor 2 on the disc entry side of the caliper bracket 3 is inserted into one side of the back plate 7b.
Also, the other side of the back plate 7b is loosely fitted in the pad guide groove 3a recessed on the disc feeding side of the caliper bracket 3,
Similar to the caliper body 6 described above, the caliper body 6 is suspended so as to be movable in the disc axial direction.

The action portion 6a is provided with deep-bottom cylinder holes 9 and 9 and shallow-bottom cylinder holes 10 having two different depths with the disk rotor 2 side open. Cup-shaped pistons 11, 11 and 12 having different lengths are also inserted into 9 and 10, and the piston 1
1, 11, 12 and the bottom wall 6f, between the hydraulic chambers 13, 1
3,14 are defined.

The above-mentioned bottom wall 6f is thin at the rear side portions of the deep bottom cylinder holes 9 on both sides, and is thick at the rear side portion of the central shallow bottom cylinder hole 10. Also this bottom wall 6
In f, a processing hole 15 is drilled from the boss 6h on the disk entry side to the hydraulic chamber 13 on the disk exit side, and a through hole of a thick portion 6g on the rear side of the shallow cylinder hole 10 is formed. The hydraulic chambers 13 on both sides are communicated with each other through a liquid passage hole 16. The boss portion 6h described above is formed with the liquid passage hole 16 and is screwed with a stopper 17 to make the processed hole 15 liquid-tight. Is blocked.

On the outer side wall of the cylinder holes 9, 9, 10 in the radial direction of the disk, a union boss 6i for introducing hydraulic pressure is introduced.
And the bleeder boss portion 6j for discharging air are respectively 2
The bleeder screw 18 is screwed onto each of the bleeder boss portions 6j. One of the union bosses 6i, 6i is the hydraulic chamber 13 on the disc entry side.
And the other union hole 19 is in the center of the hydraulic chamber 1.
4, the caliper body 6 has two systems, that is, a hydraulic pressure path that connects the hydraulic pressure chambers 13 on both sides with a hydraulic hole 16 and a hydraulic pressure path that uses only the central hydraulic chamber 14. It is divided into

These two hydraulic pressure passages communicate with a known hydraulic master cylinder through a brake hose (not shown) connected to the union bosses 6i, 6i, and the hydraulic fluid generated in the master cylinder is communicated with the hydraulic master cylinder. , When they are introduced into the hydraulic chambers 13, 13, 14 by their respective hydraulic paths, the pistons 11, 11, 12 move forward in the cylinder holes 9, 9, 10 toward the disc rotor, and the one friction pad 7 is removed. The disk rotor 2 is pressed against one side surface. Next, with this reaction,
The caliper body 6 moves in the direction of the action portion 6a while being guided by the sliding pins 4 and 5, and the four reaction force claws 6 of the reaction portion 6b are moved.
k presses the other friction pad 7 against the other side surface of the disc rotor 2, and a braking action is performed.

Since the caliper body 6 of the present embodiment is used for the front brake of the motorcycle as described above, the above-mentioned hydraulic path is, for example, 2 in the same manner as the above-mentioned prior art.
One hydraulic pressure passage having one hydraulic pressure chamber 13, 13 is connected to the brake lever, and the other hydraulic pressure passage having one hydraulic pressure chamber 14 is connected to the brake pedal for operating the rear brake. Thus, when the disc brake 1 is operated by either the brake lever or the brake pedal, the pad pressing force of the pistons 11, 11 on both sides or the piston 12 at the center is the same as those three pistons 11, 11, 12.
The thrust center (on the central axis of the central piston 12) acts symmetrically.

Three cylinder holes 9, 9, 1 of the operating portion 6a
0 is thus divided into two hydraulic pressure paths so that the respective pad pressing forces act on the friction pad 7 in a well-balanced manner. No longer being pushed, friction pad 7
Uneven wear can be effectively prevented. Further, the fluid pressure chambers 13, 13 on both sides are communicated with each other, and the central shallow cylinder hole 10 is provided.
By utilizing the thick portion 6g on the rear side, the liquid passage hole 1
Since the processed hole 15 for forming 6 does not have to be overlaid separately and can be formed in the simplest linear shape, it can be manufactured at low cost and in a light weight, and can be used as a bent liquid passage hole. In comparison, the flow of the pressure liquid is quick and good.

Next, the second to fourth embodiments of the present invention will be described with reference to FIG.
~ It demonstrates based on FIG. Note that the reference numerals used in the above-described first embodiment will be appropriately referred to in the description of these embodiments, and the same components as those in the first embodiment will be denoted by the same reference numerals and detailed description thereof will be omitted.

FIG. 4 shows a second example of a four-pot two-system system.
In the embodiment, the working portion 6m of the caliper body 6 arranged on one side of the disc rotor 2 has two shallow bottom cylinder holes 10, 9 between the two deep bottom cylinder holes 9, 9. 1
0 is provided.

Hydraulic chambers 13, 13 of the deep-bottomed cylinder holes 9, 9
Is a thick hole portion 6g on the rear side of the shallow cylinder holes 10 and 10 due to the processed hole 15 drilled from the boss portion 6h on one side.
And the shallow cylinder holes 10 and 10 are communicated with each other by a bleeder hole 21 formed at the boundary between the partition wall 6n and the thick portion 6g. , The hydraulic paths 13 and 13 on both sides are connected to each other via the fluid passage hole 20, and the hydraulic chambers 14 and 14 on the inner side are connected to each other via the bleeder hole 21. There is. The hydraulic chambers 13 and 13 of the shallow cylinder holes 10 and 10 can be replaced with the bleeder holes 21, and a core during casting can be used to form a liquid passage hole for communicating these.

FIG. 5 is a third embodiment showing the case of the 2-pot system with 5 pots, in which one shallow-bottom cylinder hole 10 is arranged in the center of the operating portion 6o and the other four are designated as deep-bottom cylinder holes 9. The hydraulic chamber 13 of these four deep cylinder holes 9
A liquid passage hole 22 penetrating the thick portion 6g on the rear side of the shallow cylinder hole 10 is connected linearly.

In the fourth embodiment shown in FIG. 6, the acting portion 6p is
Three deep bottom cylinder holes 9 and two shallow bottom cylinder holes 10
The two-sided 5-pot system in which and are alternately arranged, the hydraulic chambers 13, 13, 13 at both sides and the center are connected to the shallow cylinder holes 10, 1.
0 is made to linearly communicate with a liquid passage hole 23 penetrating the thick portions 6g, 6g on the rear side, and the hydraulic chambers 14, 14 between them are connected to the outer wall of the action portion 6p in the radial direction of the disk at the central depth. The liquid communication hole 24 is formed so as to straddle the bottom cylinder hole 9,
It is divided into two hydraulic paths.

The two hydraulic paths of the present invention are, as already described in the latter part of the first embodiment, operated by both the brake lever and the brake pedal as the front brake of the motorcycle, and also by the four wheels. In automobiles, one hydraulic path connected to the shallow cylinder hole may be used for the parking brake.

[0025]

As described above, according to the present invention, a plurality of cylinder holes formed in the operating portion of the caliper body are deep-bottomed cylinder holes including at least two cylinder holes, and other shallow holes. The bottom cylinder holes are arranged so as to be symmetric with respect to the center of the disk rotor and a disk radial direction line passing through the thrust center points of these cylinder holes, and the bottom wall portion of the shallow bottom cylinder hole is thickened, In the bottom wall portion of the shallow bottom cylinder hole, a liquid passage hole communicating with the deep bottom cylinder hole is formed,
By dividing the hydraulic path of the caliper body into two systems, the pad pressing force acts symmetrically about the thrust center even when one of the hydraulic paths is operated, so uneven wear of the friction pad is prevented. It can be effectively prevented. Also,
Since the thick wall portion of the bottom wall on the rear side of the central cylinder hole is used as the liquid passage hole that connects the hydraulic chambers of the cylinder holes on both sides, the machining hole for forming the liquid passage hole has a simple linear shape. It is possible to manufacture it at low cost, and it is possible to reduce the weight because there is no need to build up a separate pad for forming the liquid passage hole. Further, compared with the bent liquid passage hole, the flow of the pressure liquid is quick and good.

[Brief description of drawings]

FIG. 1 is a sectional view taken along line I-I of FIG.

FIG. 2 is a front view of a disc brake showing a first embodiment of the present invention.

FIG. 3 is a sectional view taken along line III-III in FIG.

FIG. 4 is a sectional view of a main part showing a second embodiment of the present invention.

FIG. 5 is a sectional view showing an essential part of a third embodiment of the present invention.

FIG. 6 is a sectional view showing an essential part of a fourth embodiment of the present invention.

[Explanation of symbols]

1 ... Disc brake, 2 ... Disc rotor, 3 ... Caliper bracket, 6 ... Caliper body, 6a ... Working portion,
6b ... Reaction part, 6f ... bottom wall, 6g ... thick part of bottom wall 6f, 6h ... boss part, 6i ... union boss part, 6j ... bleeder boss part, 6k ... reaction claw, 7 ... friction pad, 9 ... deep Bottom cylinder hole, 10 ... Shallow bottom cylinder hole, 11, 12 ... Piston, 13, 14 ... Hydraulic chamber, 15 ... Machining hole, 16 ... Liquid passage hole, 17 ... Stopper

Claims (1)

[Scope of utility model registration request] 1. A plurality of cylinder holes, which are open to the disk rotor side, are arranged in parallel in the disk circumferential direction in an action portion arranged on the side part of the disk rotor, and are inserted in each cylinder hole. In a caliper body of a hydraulic vehicle disc brake in which a piston is pushed by a pressurized hydraulic fluid supplied to a hydraulic chamber at the bottom of a cylinder hole, a plurality of cylinder holes are formed at a depth including at least two on both sides. The bottom cylinder hole and other shallow bottom cylinder holes shallower than the bottom cylinder hole are arranged so as to be symmetrical with respect to the center of the disk rotor and the disk radial direction line passing through the thrust center point of these cylinder holes. The bottom wall portion of the shallow-bottom cylinder hole is made thick, and the bottom wall portion of the shallow-bottom cylinder hole is provided with a liquid passage hole that communicates with the deep-bottom cylinder hole.
A hydraulic brake caliper body for vehicles that is divided into different systems.