JPS62378B2 - - Google Patents

Abstract

PURPOSE:To smoothen the movement of the cylinder by integrally forming cylinders corresponding to the number of cylinder guides at the opposite side of the pad pressing portion, in the titled pad pressing cylindrical body in which the cylinder is not directly formed in the caliper body. CONSTITUTION:The fluid pressure is transmitted to a hydraulic chamber 34a through a hose 27, and fluid passages 24 and 18, and further to a hydraulic chamber 34b through a fluid passage 35. The pad pressing cylindrical body 29 advances by the fluid pressure of both hydraulic chambers 34a and 34b, and presses a first pad 45 against the disc 3 by a continuous pad pressing portion 30 of a large area through a back plate 47. By this reaction force, a caliper body 1 moves reversely, a second pad 46 is pressed against the disc 3 by a second arm 5, and clamps and slidably contacts the disc 3 in cooperation with the pad 45 and brakes the disc 3. By the release of the fluid pressure, the press cylinder 29 is restored to its original position by a seal 33, and the brake is released. By this construction, the movements of the cylinder guides and cylinder can be smoothened.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a pad pressing member for a hydraulic disc brake in which a cylinder is not directly formed on a carrier body.

Current hydraulic disc brakes have a cylinder formed in the operating arm of the caliper body, and a piston fluid-tightly fitted in the cylinder is actuated by hydraulic pressure to press the pad. Therefore, when a plurality of cylinders are formed in the actuating arm, one pad is pressed by a piston fitted in each cylinder.

Those with multiple cylinders on the actuating arm have a smaller piston diameter than one with one cylinder, and the effective braking radius of the disc is larger than one with one cylinder, so the cylinder diameter is smaller and therefore the cylinder diameter is smaller. The piston diameter also becomes smaller. For this reason, if the pads are worn unevenly on the disk rotation side than on the disc rotation side, or if different brake lines are connected to multiple cylinders and one of them is not activated, the pads should be As a result, the small-diameter piston may come into contact with the pad at an angle, or press a portion of the pad, which may prevent the piston from operating smoothly with respect to the cylinder.

Therefore, the present invention has been made with the above-mentioned background in mind. A plurality of cylinder guide bodies are fixed to the operating arm of a caliper body, and each cylinder is slidably fitted in a liquid-tight manner to the guide body. A hydraulic disk is used to push the pad by supplying hydraulic pressure to the hydraulic chamber formed between the cylinder guide and the pad pressing body that forms the cylinder. A single pad pressing cylinder body has a plurality of cylinders integrally formed on the opposite side of the cylinder guide body in accordance with the number of cylinder guide bodies, so that the pad can be pushed by one wide continuous pad pressing part, and the cylinder guide body The reason is that the movement between the cylinder and the cylinder is smooth.

An embodiment shown in the drawings will be described below.

First of all, an embodiment shown in FIGS. 1 to 4 will be described. A carrier body 1 straddles a rotatable disk 3 via a bridge portion 2.
It has a U-shape consisting of a first arm 4 and a second arm 5 that are parallel to the plane of Alternatively, slide pins 9, 9 fixed with socket bolts 8' may be inserted into bolt holes 10, 10 in a part of the vehicle body.
The bracket 11 is slidably inserted into pin holes 12, 12 of the bracket 11 fixed by a bolt (not shown) inserted through the bracket 11, and is supported so as to be movable in the axial direction of the disk. Reference numerals 13 and 13 are dustproof boots for the sliding pins 9 and 9.

Cylinder guide bodies 14a, 14b provided in correspondence with the number of through holes 6a, 6b are provided in the large diameter portion 1, respectively.
5 and a small diameter portion 16, and a female thread 17 is formed halfway from the end of the small diameter portion 16.

The cylinder guide body 14a has a liquid passage 18 opening from the tip of the female screw 17 to the end of the large diameter portion 15, and the end of the large diameter portion 15 is opposed to the plane of the disk 3, and the small diameter portion 16 is connected to the small diameter portion 16. The guide body 14a is fastened to the carrier body 1 with a joint bolt 20a inserted into the through hole 6a of the arm 4, sandwiching the seal 19 and screwed into the female thread 17 so that the axial direction of the guide body 14a is perpendicular to the plane of the disk 3. be done.

On the other hand, the small diameter portion 16 of the cylinder guide body 14b is similarly inserted into the through hole 6b of the first arm, and the bolt 20b is screwed into the female thread 17 while sandwiching the seal.
The guide body 14b is fastened to the carrier body 1 so that its axial direction is perpendicular to the plane of the disk 3.

The joint bolt 20a has a male thread 22a which is screwed into the female thread 17 of the cylinder guide 14a by sandwiching the flange 21a, and a jig is secured when the cylinder guide 14 is attached to and removed from the first arm 4 of the carrier body 1. The base 28 of the brake hose 27 is formed with a union bolt 26 screwed into a female thread 25 formed on the inlet side of the fluid passage 24. Provided in a removable manner.

The bolt 20b has a male thread 2 which is screwed into the female thread 17 of the cylinder guide body 14b while sandwiching the flange 21b.
2b and a hexagonal head 23b.

The pad pressing cylinder body 29 is a pad pressing part 30.
Cylinders 31a and 31b corresponding to the cylinder guide bodies 14a and 14b are formed on the opposite side thereof, and the cylinders 31a and 31b are connected to the cylinder guide body 14.
The cylinders 31a, 31b are slidably fitted onto the outer circumferences of the large diameter portions 15, 15 of the cylinders 31a, 14b, and supported fluid-tightly by corner seals 33, 33 fitted in the circumferential grooves 32, 32 of the cylinders 31a, 31b. and the large diameter portions 15, 1 of the cylinder guides 14a, 14b.
Hydraulic pressure chambers 34a and 34b are formed between the two. Further, the cylinder body 29 has hydraulic chambers 34a, 34.
A liquid path 35 communicating with both cylinders 31a and 31
A master cylinder (not shown) is formed between
Hydraulic pressure is transmitted via the brake hose 27, union bolt 26, and liquid passages 24 and 18, and is supplied to the hydraulic pressure chamber 34a, the liquid passage 35, and the hydraulic pressure chamber 34b, so that the cylinder body 29 moves forward. In addition, to form the liquid path 35, for example, from the outside of the cylinder 31b to the cylinder 3
A hole communicating with the cylinder 31a is formed in the partition wall 36 through the interior of the cylinder 31b, and a seal ball 37 is driven into the cylinder 31b from the outside to seal it. Furthermore, a bleeder 39 is attached to the cylinder body 29 in a bleeder attachment hole 38 communicating with the hydraulic pressure chamber 34b, and lip seals 40, 40 for dustproofing are provided on the mouth edges of the cylinders 31a, 31b. Further, this pad pressing cylinder body 29 is not limited to metal, and may be made of synthetic resin.

In addition, an elongated window 41 in the disc axis direction is formed in the portion of the bridge portion 2 of the carrier body 1 where the tip of the bleeder 39 is located, to prevent contact between the bleeder 39 and the bridge portion, and to prevent air bleeding and lining wear. It is designed so that it can be detected.

Retainers 44, 44 are attached to the pad support parts 43, 43 above the torque receiving parts 42, 42 of the bracket 11.
A first pad 45 and a second pad 46 sandwich the disk 3 and are suspended by back plates 47 and 48, respectively. 49 is a shim plate.

In order to improve the strength of the caliper body 1, side walls may be integrally molded on the disk insertion side and the disk extraction side of the body 1.

Next, to explain the operation of the device, hydraulic pressure is applied from the master cylinder (not shown) to the brake hose 27, the ferrule 28, the union bolt 26, the fluid path 24 of the joint bolt 20a, and the fluid path 18 of the cylinder guide 14a. When the pressure is transmitted to the hydraulic pressure chamber 34a through the hydraulic pressure chamber 34a, it is further transmitted to the hydraulic pressure chamber 34b through the hydraulic path 35, and the pad pressing cylinder body 29 is moved forward by the hydraulic pressure generated in both the hydraulic pressure chambers 34a and 34b. However, one large area of continuous pad pressing part 3
0, press the back plate 47 of the first pad 45 to press the first pad 45 against one flat surface of the disk 3,
The reaction force generated by this causes the carrier body 1 to move in the opposite direction to the moving direction of the pressing cylinder body 29 via the sliding pins 9, 9, and the second arm 5 pushes the back plate 48 of the second pad 46. 2nd pad 4
6 is pressed against the other flat surface of the disc 3, and both pads 45 and 46 press and slide the disc 3 into sliding contact to perform braking.

When the hydraulic pressure in the hydraulic chambers 34a, 34b is released, the pad pressing cylinder body 29 returns to its original position due to the corner seals 33, 33, and the carrier body 1 also returns to its original state, and the pressing force on both pads 45, 46 is released. The braking action will no longer work.

Furthermore, in order to assemble the cylinder guides 14a, 14b and the pad pressing cylinder body 29 to the carrier body 1, the cylinders 31a, 31b of the pad pressing cylinder body 29 are fitted into the respective large diameter portions 15, 15 in a liquid-tight and slidable manner. , insert the small diameter parts 16, 16 of the cylinder guides 14a, 14b into the through holes 6a, 6b of the first arm 4 from below the bridge part 2, sandwich the seal 19, and insert the male threads 22a, 22 of the bolts 20a, 20b.
2b are screwed into the female threads 17, 17 of the small diameter portions 16, 16, respectively, and the hexagonal heads 23a, 23b are locked with a jig to tighten the cylinder guides 14a, 14b.
The cylinder guides 14a, 14b and the cylinder 3 are corrected and moved in the through holes 6a, 6b, which are play holes, so that their axes are perpendicular to the plane of the disk 3.
The axial directions of 1a and 31b match, and the stepped portions of cylinder guides 14a and 14b and bolts 20a and 20b
The first arm 4 is clamped and fixed by the flanges 21a and 21b.

Next, the embodiment shown in FIGS. 5 and 6 will be described. The cylinder guide 14b also has a fluid passage 18, is fixed with a joint bolt 20a, and has a hydraulic chamber 34b separated from the hydraulic chamber 34a. Thus, brake fluid can be supplied separately to both hydraulic pressure chambers 34a and 34b.

Therefore, the pad pressing cylinder body 29 does not have a liquid passage 35 between the cylinders 31a and 31b, but has a bleeder 39 separately attached thereto by communicating the bleeder attachment hole 38 with the cylinder 31a. Therefore, two elongated windows 41 are formed in the bridge portion 2.

In this embodiment, even if one system is not operated due to damage or the like, hydraulic pressure is generated in the other system, and the pad pressing cylinder body 29 moves forward, pressing one wide continuous pad. Padded 45 back plate 4
7 can be pushed and moved.

In the above embodiment, two cylinders are formed on opposite sides of the pad pressing part, but the present invention is not limited to this, and any structure may be used as long as a plurality of cylinders are formed. Moreover, it goes without saying that an opposed type disc brake can also be applied.

As described above, the present invention presses the pad by sliding the cylinder body integrally formed with a plurality of cylinders on the opposite side of the pad pressing part in a liquid-tight manner, so that the pad pressing part is continuously formed. , the pads can be pressed evenly, the piston galling phenomenon caused by uneven wear of the pads, etc. can be reduced, and the cylinder body can move forward and press the pads even if pressure fluid is not supplied to all the hydraulic pressure chambers. Therefore, braking efficiency can be improved, the seal groove and cylinder inner diameter can be easily machined, and the seal portion can be separated from the pad.

[Brief explanation of the drawing]

Figures 1 to 4 show one embodiment of the present invention; Figure 1 is a front view, Figure 2 is a partially cutaway plan view, Figure 3 is a sectional view, and Figure 4 is a pad press. The cross-sectional front view of the cylinder body, FIG. 5, and FIG. 6 show other embodiments, and FIG. 5 is a partially cutaway plan view, and FIG.
The figure shows a pad pressing cylinder body. 1 is the carrier body, 3 is the disk, 4 is the first
Arm, 5 is the second arm, 6a, 6b are through holes, 14a,
14b is a cylinder guide body, 15 is a large diameter portion, 16 is a small diameter portion, 18 is a liquid path, 20a is a joint bolt, 20b is a bolt, 24 is a liquid path, 26 is a union bolt, 28 is a brake hose fitting, 29 is a Pad pressing cylinder body, 30 is pad pressing part, 31
a and 31b are cylinders, 34a and 34b are hydraulic chambers, 35 is a liquid path, 36 is a partition wall, 38 is a bleeder mounting hole, and 39 is a bleeder.

Claims (1)

[Claims] 1. A cylinder is slidably fitted in a liquid-tight manner to a plurality of cylinder guides fixed to the operating arm of the carrier body, and the hydraulic pressure supplied to the hydraulic pressure chamber formed between the cylinder and the cylinder guide is applied. In the pad pushing cylinder body that moves forward and pushes the pad,
A pad pressing cylinder body for a hydraulic disc brake, characterized in that a plurality of cylinders corresponding to the number of cylinder guide bodies are integrally formed on the opposite side of a pad pressing part.