JPS5857523A - Hydraulic type disc brake - Google Patents

Abstract

PURPOSE:To smoothen the pad pressing operation by providing two arms striding over the disc and also providing a plurality of guides for guiding cylinders incorporating the hydraulic pad pressing cylinder in one arm to communicate with respective hydraulic chambers, in the title brake provided with no cylinder in the body. CONSTITUTION:The fluid pressure is transmitted to a hydraulic chamber 34a through a hose 27 and flow passages 24 and 18, and to a hydraulic chamber 34b through a fluid passage 35, and advance a pad pressing cylinder member 29 and presses the pad 43 to the disc 3 by the pad pressing part. By this reaction force, the caliper body 1 moves reversely, and the arm 5 presses the pad 44 against the disc 3. Accordingly, the disc 3 is clamped and slidably contacted by pads 43 and 44, and the braking effect is generated. With the releasing of the fluid pressure, the pad pressing cylinder member 29 is restored by a corner seal 33 to release the brake. By this construction, it is possible to smoothen the pressing of the pad and to improve the easiness in the working.

Description

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

Currently, in disc brakes in which a caliper body is attached to a bracket fixed to a part of the vehicle body so that it can slide or rotate in the disc direction, a plurality of (for example, two) cylinders are integrally molded on the operating arm of the caliper body. A piston is inserted into each cylinder, the piston is moved forward by the hydraulic pressure supplied to the hydraulic pressure chamber, the pad is pressed against the disc, and the reaction force is used to move the caliper body against the disc and push the pad on the opposite side. There is also a type that performs braking by pressing against the disc and pressing and sliding the pad modisks into contact with each other.

This is compared to a single caliper, which has one cylinder in the working arm.Since the diameters of the cylinder and piston can be made smaller, the effective braking radius of the disc can be increased, and the braking ability is slightly better. Since the disk rotation side is larger, as the number of braking increases, the pushing distance of the piston located on the disk rotation side becomes larger than that of the piston on the disk rotation side, and the position of the tip of the piston changes. The piston does not open and comes into contact with the pad back plate at an angle, and since the piston diameter is small, there is a risk that the piston will make partial contact with the cylinder and the piston will not move smoothly.

Furthermore, forming a plurality of cylinders on a caliper body having a complicated shape has disadvantages such as poor work efficiency.

This invention was invented against the background of the points mentioned above, and the first
The invention consists of a first arm and a second arm that straddle the disc via a bridge part.
A plurality of through holes are formed in a first arm of a caliper body consisting of an arm, and a cylinder guide body consisting of a large diameter part and a small diameter part is inserted with its small diameter part into the through hole of the first arm and then bolted. A single band suppressing cylinder body is fastened to the caliper body, and cylinders corresponding to the number of cylinder guide bodies are formed on the opposite side of the pad suppressing part.The cylinders are respectively fitted into the large diameter parts of the cylinder guide bodies in a fluid-tight and slidable manner. one of the bolts for fastening the cylinder guide to the caliper body is a joint bolt to which a brake hose fitting can be connected;
Supplying pressure fluid to the hydraulic pressure chamber formed by the cylinder and the large diameter portion of the cylinder guide through the joint bolt, and also forming the pressure fluid by the other cylinder and the large diameter portion of the other cylinder guide. The second invention is characterized in that the fluid can be supplied to the hydraulic pressure chamber through the fluid path passing through each cylinder. The diameter of the small diameter part of the guide body is slightly larger than the diameter of the small diameter part, and the hole is made loose.

The purpose is to provide a disc brake that can smoothly push a band by pushing a single pad suppression cylinder body using a plurality of hydraulic pressure generating mechanisms and is easy to process.

An embodiment shown in the drawings will be described below.

The caliper body 1 has a U-shape consisting of a first arm 4 and a second arm 5 that straddle a rotatable disk 3 via a bridge portion 2 and are parallel to the plane of the disk 3, and the first arm 4 has a through hole. s
a+6b and protruding from both sides respectively 7.
Bracket 1 fixed to part 7 with bolt 8 or socket bolt 8' and sliding pins 9, 9 fixed to part of the vehicle body with bolts (not shown) inserted into bolt holes 10 and 10.
It is slidably inserted into the bottle holes 12 and 12 of No. 1 and supported so as to be movable in the disk axial direction. Reference numerals 13 and 13 indicate protection boots for the sliding pins 9 and 9.

The cylinder guide bodies 14a and 14b provided in correspondence with the number of through holes 5a and 5b have a large diameter portion 15 and a small diameter portion 16, respectively.
A female thread 1T is formed halfway from the end of the small diameter portion 16.

The cylinder guide 14a extends from the tip of the female thread 17 to the large diameter portion 15.
A liquid passage 18 opening at the end is bored, and the large diameter portion 15
The small diameter portion 16 is inserted into the through hole 6a of the first arm 40 with its end facing the flat surface of the disk 3, and the joint 20a is screwed into the female thread 17 while sandwiching the seal 19, in the axial direction of the guide body 14a. is fastened to the caliper body 1 so as to be perpendicular to the plane of the disc 3.

Similarly, the small diameter portion 16 of the opening cylinder guide 14b is inserted into the through hole 6b of the first arm, and the bolt 20b is screwed into the internal thread IT while holding the seal. The caliper body 1 is fastened to the caliper body 1 so as to be perpendicular to the plane of the caliper body 1.

Joint bolt 20a KFi flange 21 & male thread 2 screwed into the female thread 1T of the cylinder guide 14a.
2a and the cylinder guide body 14 in the first position of the caliper body 1.
It forms a hexagonal head 23a that locks the jig when it is attached to and detached from the arm 4, and also forms a liquid passage 24 that penetrates in the axial direction, and is screwed into a female thread 25 formed on the inlet side of the liquid passage 24. At the union Zalto 26, brake hose 210 and cap 28
Provided in a removable manner.

20 bFi A male screw 22b which is screwed into the female screw 17 of the cylinder guide 14b and a hexagonal head 23b sandwich the flange 21b.

The pad suppressing cylinder body 29 has a pad press Ef[30 and cylinder guide bodies 14a, i4b on the opposite side thereof.
The cylinders 31 a + 3 l b are formed with a groove, and the cylinders 31 a * 31 b are formed with the cylinder guide body 14 a,
14. It is slidably fitted onto the outer periphery of the large diameter portion 15.15 of the cylinder 31a+311: + of the circumferential grooves 32, 3.
Liquid-tightly supported by corner seals 33 and 33 fitted to 2,
Cylinder 31 ar 31 b and the cylinder guide body 1
A liquid passage 35 is formed between both cylinders 31a and 3Ib, and the large diameter portions 15 and 1 of 4a and 114b are connected to the master cylinder (
Hydraulic pressure from the brake hose 27. The hydraulic pressure chamber 3 is transmitted via the union M route 26 and the liquid passages 24 and 1B.
It is supplied to the 4a1 fluid path 35 and the fluid pressure chamber 34b, and the cylinder body 29ti moves forward. Furthermore, a leader 31 is attached to the cylinder body 29 in a leader attachment hole 36 communicating with a hydraulic pressure chamber 34b, and a cylinder 31a.

Dust-proof rinse seals 38, 38 are provided on the edge of the mouth 31b.

A through hole 6 formed in the first arm 4 of the caliper body 1
The diameters of a and 6b are those of the cylinder guide body 14a.

The diameter of the small diameter portion of 14b is formed to be large so as to form a evening aperture. The cylinder guide body 14a.

1'4b to the caliper body 1, the cylinder guide body 14a, with the large diameter portions 15 degrees 15 of the cylinder guide bodies 14a, 14b fitted in the cylinders 31a, 31b of the band suppressing cylinder body 29, Small diameter portion 16 of 14b
', 1 ' 6 are inserted into the through holes 5a, 5b and screwed with the bolts 20a+20b, they can be moved and fastened so that the direction of the small diameter line is perpendicular, and the cylinder of the pad suppression cylinder body 29KIIa is Guide bodies 14a, 14b
Centering work is easy even when installing a

In addition, an elongated window 39 extending in the disk axial direction is formed in the portion of the caliper body 1 where the tip of the leader 3T of the presozo section 2 is located, which allows air to be removed, prevents contact between the presozo section 2 and the presozo section 2, and This makes it possible to detect the amount of wear during two innings.

The first pads 43 are held (1) by the back plates 45, 46, respectively, with the disc 3 sandwiched through the band support parts 4i, 41, and retainers 42, 42 above the torque receiving parts 40, 40 of the bracket 11. ing. 4T is a shim plate.

In addition, when improving the strength of the caliper body 1, the body 1
Side walls may be integrally molded on the disk insertion side and the disk extraction side.

Next, to explain the operation of the device, the mass 227,
Clasp 28, Union port 26, Zoyointbol) 20
When it is transmitted to the hydraulic pressure chamber 34a via the liquid passage 24 of a and the liquid passage 18 of the cylinder guide 14a, it is further transmitted to the hydraulic pressure chamber 34b via the liquid passage 35, and the band pressing cylinder body 29 is It moves forward due to the hydraulic pressure generated in the hydraulic pressure chambers 34M+34b, and the back plate 45 of the first pad 43 is pressed by the band pressing part 30.
The pressure pad 43 is pressed against one flat surface of the disk 3, and the reaction force generated by this causes the caliper body 1 to move in the direction of movement of the suppression cylinder body 29 via the sliding pins 9, 9. , and push the back plate 46 of the second pad 44 with the second arm 5 to move the second pad 44 to the disk 3.
The pads 43 and 44 are pressed against the other flat surface of the disc 3 and brought into sliding contact with the disc 3 to effect braking.

When the hydraulic pressure in the hydraulic chambers 34a and 34b is released, the corner seal 3
3.33, the pad suppression cylinder body 29 returns,
As a result, the caliper body 1 also returns to its original state, and both pads 43
．． 44 is released and the braking action no longer works.

Also, the cylinder guide bodies 14a+14b are connected to the caliper body 1.
To assemble the cylinder 311 of the pad pressing cylinder body 29 to each large diameter portion 15.15! L.

31b is slidably fitted in a liquid-tight manner, and the small diameter portions 16.16 of the cylinder guides 14a, 14b are inserted into the through holes 5a, 5b of the first arm 4 from below the Purizzo portion 2, and the seal 19 is sandwiched between the small diameter portions 16.16 of the cylinder guides 14a, 14b. The male threads 22a+22b of the bolts 20a, 20b are screwed into the female threads 17.17 of the small diameter portion 16.16, respectively, to form a hexagonal head 23a.

When the jig is locked and fastened to 23b, the cylinder guide body 14
a, 141) is corrected and moved in the through hole (ia, $b) so that the axis is perpendicular to the plane of the disk 3, and the cylinder guide 14a114b and the cylinders 31a, 31b are aligned in the axial direction, and the cylinder guide Step portions of the bodies 14a, 14b and collar portions 21a + 21b of the roots 20a, 20b
The first arm 4 is held between K and K and fixed.

In the above embodiment, two cylinder guide bodies 14a are provided on the operating arm.
, 14b are fixedly fixed, but the present invention is not limited to this, and it goes without saying that it is sufficient to have a plurality of cylinder guides fixedly fixed.

As described above, the present invention fixes a plurality of stepped shaft-shaped cylinder guide bodies formed separately from the caliper body to one arm of the caliper body, and each cylinder is slidably fitted in a liquid-tight manner to the guide bodies. Since a single pad suppressing cylinder body is provided, the pad suppressing part of the band suppressing cylinder body is formed continuously compared to a conventional piston with so-called multiple pots, so the pads can be suppressed on the average, and uneven wear of the band etc. In addition, since the diameter of the through hole to which the cylinder guide body is attached is made to be a double hole, the centering direction can be corrected when tightening the cylinder guide body to the caliper body. It is easy to process the seal groove and cylinder inner diameter, and it is easy to assemble using a simple jig.
Since the hydraulic pressure chamber is located in a position where it is easily exposed to the outside air, cooling performance is good, and since the seal part is mounted away from the pad, deterioration can be prevented, and wear particles are difficult to accumulate. be.

[Brief explanation of drawings]

The figures show an original embodiment of the present invention, and Fig. 1 is a front view;
Figure 2 is a partially cutaway plan view, Figure 3 is a sectional view, Figure 9
The figure is a cross-sectional front view of the band suppressor. 1 is the caliper body, 3 is the disc, and 4 is! /Arm, 5 is the second arm, 5a, 5'b 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 zoyo bolt, 20bFi
port, 24 is a liquid path, 26 union bolts, 28 is a brake hose cap, 29 is a pad suppression cylinder body, 30
is a para-r pressing portion, 31a. 31b is a cylinder, 34a and 34b are hydraulic pressure chambers, and 35 is a liquid path.

Claims (1)

[Claims] 1. In a disc brake in which a caliper body is provided on a bracket fixed to a part of the vehicle body so as to be movable in the disc axial direction, a first arm and a second arm that straddle the disc via a bridge part. a plurality of cylinder guides each having a caliper body having a plurality of through holes formed in the first arm; a large diameter portion and a small diameter portion that is inserted through the through hole of the first arm and fastened to the caliper body with a bolt; a pad pressing member, which is formed by forming a plurality of cylinders corresponding to the cylinder guide body, and fitting the cylinders into the large diameter portion of the cylinder guide body in a liquid-tight and slidable manner; One of the bolts fastening the cylinder body and the cylinder guide body to the caliper body is a joint bolt that can be connected to the brake hose mouthpiece, and the joint bolt and the cylinder guide body fastened to the caliper body by the joint bolt a fluid path that passes through the large diameter portion and supplies brake fluid to a hydraulic pressure chamber formed between the large diameter portion and the pad suppression cylinder; A hydraulic disc brake comprising: a fluid passage formed in a band suppression cylinder body so as to communicate each hydraulic pressure chamber formed between each cylinder of the band suppression cylinder body. 2. In a disc brake in which a caliper body is provided on a bracket fixed to a part of the vehicle body so as to be movable in the disc axial direction. A caliper body is composed of a first arm and a second arm that straddle the disk via a bridge portion, and has a plurality of through holes formed in the first M, and a caliper body that is inserted into the large diameter portion and the through holes of the first arm and is connected to a bolt. a plurality of cylinder guide bodies each having a small diameter portion that is fastened to the caliper body through a pad suppressing portion; and a plurality of cylinders corresponding to the cylinder guide bodies on the opposite side of the pad suppressing portion; One pad suppressing cylinder body is slidably fitted in a fluid-tight manner in each diameter portion, and one of the bolts fastening the cylinder guide body to the caliper body is a joint bolt that can be connected to a brake hose mouthpiece, and the joint bolt and a large diameter portion of the cylinder guide fastened to the caliper body by the joint bolt, and supplies brake fluid to a hydraulic pressure chamber formed between the large diameter portion and the band suppression cylinder. and a liquid passage formed in the pad suppression cylinder body so as to communicate each hydraulic pressure chamber formed between each large diameter portion of the plurality of cylinder guide bodies and each cylinder of the pad suppression cylinder body. , and the diameter of the through hole of the first arm is at least larger than the diameter of the small diameter portion of the cylinder guide, and the large diameter portion of the cylinder guide is fitted into each cylinder of the pad suppression cylinder body. 1. A hydraulic disc brake characterized in that the cylinder guide is formed so large that the axial direction of the cylinder guide is perpendicular to the disk plane when the cylinder guide is fastened to the caliper body with bolts.