JPH0540630U - Carry Pavody of Disc Brake for Hydraulic Vehicle - Google Patents

Abstract

(57) [Summary] [Purpose] When there are three or more cylinder holes formed in the action part of the caliper body, divide these cylinder holes into two systems in a well-balanced manner to minimize uneven wear of the friction pad. To prevent. A liquid through hole between cylinder holes can be easily formed with a simple shape. [Structure] Two deep bottom cylinder holes 9, 9 are provided on both sides of a working portion 6a of a caliper body 6, and one shallow bottom cylinder hole 1 is provided.
0 is provided at the center of each acting portion 6a. In the thick portion 6g on the rear side of the shallow cylinder hole 10, the hydraulic chambers 13, 1 on both sides are provided.
The liquid passage hole 16 that communicates 3 is formed linearly. The hydraulic chambers 13 on both sides are divided into two systems, a hydraulic passage communicating with the liquid passage hole 16 and a hydraulic passage using only the central hydraulic chamber 14.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a caliper body of a hydraulic disc brake mounted on a vehicle such as a four-wheeled vehicle and a motorcycle, and more specifically, it divides a plurality of cylinder holes provided in an action part into two hydraulic systems. Concerning the structure of the caliper body.

[0002]

[Prior Art]

 As a two-system type caliper body in which the hydraulic pressure path of the caliper body is divided into two, for example, there is one shown in JP-A-62-26183.

This technique is dedicated to the 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.In addition, the cylinder hole operated by the brake lever is formed with a larger diameter than the cylinder hole operated by the brake pedal. By doing so, the braking force required for the front brake can be obtained even when the braking operation is performed only by the brake lever.

[0004]

[Problems to be solved by the device]

 In such a configuration, when the front brake is operated by either the brake lever or the brake pedal, the friction pad is pushed on the biased portion on the disc entry / exit side. Uneven wear is unavoidable.

Further, from the above, when the number of the cylinder holes is three or more, the cylinder holes are systematically divided into two hydraulic paths so as to prevent uneven wear of the friction pads. It is desirable that the pad pressing force of the piston be acted in a balanced manner, but the shape of the liquid through hole that connects the cylinder holes of each system was complicated and machining was difficult, and the cost was unavoidable.

The present invention has been made in view of such an actual situation, 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. In addition, it is 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 cylinder holes at low cost.

[0007]

[Means for Solving the Problems]

 In order to achieve the above-mentioned object, the present invention has three or more cylinder holes, which open toward the disc rotor side, arranged side by side in the disc circumferential direction in the working portion arranged on the side portion of the disc rotor. In a caliper body of a hydraulic vehicle disc brake in which a piston inserted in each cylinder hole is pushed by a pressurized hydraulic fluid supplied to a hydraulic chamber at the bottom of the cylinder hole, at least the plurality of cylinder holes are provided. A deep cylinder hole including two on both sides and other shallow cylinder holes shallower than this are symmetrical with the center of the disk rotor and the radial line of the disk passing through the thrust center points of these cylinder holes sandwiched. The bottom wall portion of the shallow bottom cylinder hole is thickened, and the bottom wall portion of the shallow bottom cylinder hole is provided with a liquid passage hole communicating with the deep bottom cylinder hole, For two hydraulic systems It is characterized in that digit.

[0008]

[Action]

 With this configuration, 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. Also, by combining two types of long and short cylinder holes as described above, when each hydraulic system is operated independently, the pad pressing force acts symmetrically about the thrust center.

[0009]

【Example】

 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 fixed to the vehicle body at one side of a disc rotor 2 rotating in the direction of arrow A. It has a bracket 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 arranged opposite to each other on both sides of the disc rotor 2. ing.

The caliper body 6 is a three-pot two-system type in which three cylinder holes 9, 9, and 10 are divided into two hydraulic pressure paths, and reacts with the action portions 6 a arranged on both sides of the disc rotor 2. The portion 6b is connected by a bridge portion 6c that straddles the outer circumference of the disc rotor 2. Mounting arms 6d and 6e are provided on the action portion 6a so that 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 between the action portion 6 a and the reaction portion 6 b so as to face each other with the disc rotor 2 interposed therebetween. Each of the friction pads 7 is formed by joining a lining 7a and a back plate 7b, and a hanger that is laterally laid across the disc rotor 2 on one side of the back plate 7b and on the disc entry side of the caliper bracket 3. The pin 8 is inserted, and the other side of the back plate 7b is loosely fitted in the pad guide groove 3a recessed on the disc extension side of the caliper bracket 3, and the disc axial direction is the same as the caliper body 6 described above. Suspended so that it can be moved toward.

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 inserted in 9 and 10, and hydraulic chambers 13, 13 and 14 are defined between the pistons 11, 11 and 12 and the bottom wall 6f. Is made.

The above-mentioned bottom wall 6 f is thin at the rear side portions of the deep bottom cylinder holes 9, 9 on both sides, and is thick at the rear side portion of the central shallow bottom cylinder hole 10. In addition, the bottom wall 6f is formed with a processing hole 15 extending from the boss 6h on the disk entry side to the hydraulic chamber 13 on the disk exit side to form a thick portion 6g on the rear side of the shallow cylinder hole 10. The through hole is a liquid through hole 16 that connects the hydraulic chambers 13 on both sides, and the boss portion 6h described above has the processed hole 15 formed by screwing a stopper 17 after forming the liquid through hole 16. Is liquid tightly closed.

Two union boss portions 6i for introducing hydraulic pressure and two bleeder boss portions 6j for discharging air are respectively provided on the outer side wall of the cylinder holes 9, 9, 10 in the radial direction of the disc. A bleeder screw 18 is screwed onto each of the bleeder boss portions 6j. One of the union boss portions 6i, 6i communicates with the hydraulic chamber 13 on the disc entry side, and the other union hole 19 communicates with the central hydraulic chamber 14, so that the caliper body 6 has hydraulic fluid on both sides. It is divided into two systems, that is, a hydraulic pressure path that connects the pressure chambers 13 and 13 with a liquid passage hole 16 and a hydraulic pressure path that uses only the central hydraulic pressure chamber 14.

These two hydraulic pressure passages communicate with a known hydraulic master cylinder via a brake hose (not shown) connected to the union boss portions 6i, 6i, and the hydraulic fluid generated in this master cylinder is When introduced into the hydraulic chambers 13, 13 and 14 by the respective hydraulic paths, the pistons 11, 11 and 12 move forward in the cylinder holes 9, 9 and 10 in the direction of the disk rotor, and the friction pad 7 on one side is moved. Press on one side of the disc rotor 2. Next, due to this reaction, the caliper body 6 is moved in the direction of the action portion 6a while being guided by the sliding pins 4 and 5, and the four reaction force claws 6k of the reaction portion 6b cause the other friction pad 7 to contact the disc rotor 2. By pressing to the other side surface, the 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-described hydraulic pressure passage has two hydraulic chambers 13, similar to the above-described conventional art. One hydraulic path having 13 is connected to the brake lever, and the other hydraulic path having one hydraulic chamber 14 is connected to the brake pedal that operates the rear brake. Therefore, when the disc brake 1 is operated by either one of the brake lever or the brake pedal, the pad pressing force of the pistons 11, 11 on both sides or the piston 12 in the center is the same as those of the three pistons 11, 11, 12. The thrust center (on the central axis of the central piston 12) acts symmetrically.

The three cylinder holes 9, 9 and 10 of the action portion 6 a are divided into two hydraulic pressure paths so that the pad pressing force acts on the friction pad 7 in a well-balanced manner as described above. The pad 7 will not be pushed by the biased portion on the disc entry side or the delivery side, and uneven wear of the friction pad 7 can be effectively prevented. Further, by utilizing the thick portion 6g on the rear side of the central shallow cylinder hole 10 for communicating the hydraulic chambers 13 on both sides, a machining hole 15 for forming the liquid passage hole 16 is separately provided. Since it does not require padding and requires only the simplest straight line, it can be manufactured at low cost and is lightweight, and the flow of pressurized liquid is quicker than that of a bent liquid passage. It will be good.

Next, second to fourth embodiments of the present invention will be described with reference to FIGS. 4 to 6. 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 is a second embodiment showing an example of a four-pot two-system system, in which the working portion 6m of the caliper body 6 disposed on one side of the disc rotor 2 has two depths on both sides. Two shallow cylinder holes 10, 10 are provided between the bottom cylinder holes 9, 9.

The hydraulic chambers 13, 13 of the deep-bottomed cylinder holes 9, 9 are made thicker on the rear side of the shallow-bottomed cylinder holes 10, 10 by the processing holes 15 drilled from the boss 6h on one side. The fluid passage hole 20 formed in the portion 6g communicates linearly, and the shallow cylinder holes 10 and 10 are provided by a bleeder hole 21 formed at the boundary between the partition wall 6n and the thick portion 6g. There are two channels, which are in communication with each other, and which connect the hydraulic chambers 13, 13 on both sides to each other through the fluid passage hole 20 and the hydraulic passages which connect the inside hydraulic chambers 14 and 14 through the bleeder hole 21. It is divided into lines. The hydraulic chambers 13 and 13 of the shallow cylinder holes 10 and 10 may be replaced with the bleeder holes 21, and a core during casting may be used to form a liquid passage hole for communicating these.

FIG. 5 is a third embodiment showing a case of a two-pot system with five pots, in which one shallow-bottom cylinder hole 10 is arranged in the center of the action portion 6 o and the other four are designated as deep-bottom cylinder holes 9. Therefore, the hydraulic chambers 13 of these four deep-bottomed cylinder holes 9 are linearly communicated with each other by a liquid passage hole 22 that penetrates the thick portion 6g on the rear side of the shallow-bottomed cylinder hole 10.

The fourth embodiment shown in FIG. 6 is a 5-pot two-system type in which three deep bottom cylinder holes 9 and two shallow bottom cylinder holes 10 are alternately arranged in the action part 6p, and both side parts The hydraulic chambers 13, 13, 13 in the center are linearly communicated with each other through the hydraulic holes 23 penetrating the thick portions 6g, 6g on the rear side of the shallow cylinder holes 10, 10, and the hydraulic chambers in between. 14 and 14 are communicated with the outer wall of the working portion 6p in the radial direction of the disk by a fluid passage hole 24 formed so as to straddle the central deep cylinder hole 9 and divided into two fluid pressure paths.

The two hydraulic paths of the present invention are operated by both the brake lever and the brake pedal as the front brake of the motorcycle as already described in the latter part of the first embodiment. For four-wheeled vehicles, one hydraulic path that connects to the shallow cylinder hole may be used for the parking brake.

[0025]

[Effect of the device]

 As described above, according to the present invention, a plurality of cylinder holes formed in the action portion of the caliper body are deep-bottomed cylinder holes including at least two cylinder holes, and other shallow-bottomed cylinder holes shallower than these. Are arranged symmetrically with the center of the disc rotor and the radial line of the disc passing through the thrust center points of these cylinder holes sandwiched between them, and the bottom wall of the shallow cylinder holes is made thicker. When one of the hydraulic pressure paths is activated by drilling a hydraulic hole that connects the deep cylinder hole in the bottom wall of the cylinder hole and dividing the hydraulic path of the caliper body into two systems. Moreover, since the pad pressing force acts symmetrically about the thrust center, uneven wear of the friction pad can be effectively prevented. In addition, 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, a machining hole for forming the liquid passage hole is simple. It can be manufactured at low cost with only one straight line, and it can be made lightweight because there is no need to build a separate pad for forming the liquid passage hole. Further, compared to the bent liquid passage hole, the flow of the pressure liquid is quicker and better.

[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 of a main part showing a fourth embodiment of the present invention.

[Explanation of symbols]

1 ... Disc brake, 2 ... Disc rotor, 3 ... Caliper bracket, 6 ... Caliper body, 6a ... Working part,
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 force nail, 7 ... Friction pad, 9 ... Depth 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 cylinder hole is made thick, and a liquid passage hole communicating with the deep cylinder hole is formed in the bottom wall portion of the shallow cylinder hole to form a hydraulic pressure path of the caliper body.
A disc brake caliper body for hydraulic vehicles characterized by being divided into systems.