JPH109300A - Disk brake - Google Patents

Abstract

PROBLEM TO BE SOLVED: To assemble a leaf spring to function as a pad spring and a cover with a caliper body in one operation in the inserting manner. SOLUTION: Boss parts 32A, 32B to support a leaf spring 15 are projectingly provided on an opposed-cylinder type caliper body 10 in which a pair of cylinder parts 11 are arranged opposite to each other across a disk rotor. A space 34 between the boss parts 32A, 32B and a back plate 29a of a friction pad 29 supported by a pin 28 in the direction of a cylinder shaft is used as an assembly passage, and the leaf spring 15 is inserted in an assembled passage 34 from one cylinder part 11 side while the leaf spring 15 is elastically deformed, and its four corner parts are seated on the boss parts 32A, 32B.

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 for braking a vehicle, and more particularly to a disc brake suitable for a two-wheeled vehicle.

[0002]

2. Description of the Related Art As a disk brake for a two-wheeled motor vehicle, as shown in FIG. Is attached to a non-rotating portion of the vehicle, and a pin (not shown) bridged between a pair of cylinder portions 1 and 2 of the caliper body 4 is attached to both sides of the disk rotor D. And a leaf spring functioning as a cover for covering the through hole 5 of the bridge portion 3 with a pad spring for supporting a pair of friction pads (not shown) pressed by the caliper body 4 and controlling the posture of each friction pad. 6 is supported.

[0003]

Conventionally, the leaf spring 6 is attached to the caliper body 4 in the same manner as in FIG.
As shown in FIG. 0, the pawl portions 6a protruding from both ends of the leaf spring 6 are fixed to the back surface of the bridge portion with screws 7 (see, for example, Japanese Patent Application Laid-Open No. 1-188730).

For this reason, in addition to the necessity of drilling the screw holes in the caliper body 4, the number of parts is increased due to the necessity of the mounting screws 7, and the cumbersome screwing operation with a dedicated tool is required. Thus, there is a problem that the cost burden increases.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned conventional problems. An object of the present invention is to provide a pad spring and a leaf spring which functions as a cover, which can be attached to a caliper body in a one-touch manner by a plug-in system. Therefore, cost reduction is intended.

[0006]

According to the present invention, there is provided a caliper body of an opposed cylinder type having a boss for supporting at least four corners of a leaf spring.
A gap formed between each of the bosses and the friction pad as viewed in the cylinder axis direction is used as an assembly passage for the leaf spring.

In the disk brake constructed as described above, the leaf springs are inserted from the cylinder axial direction into the assembly passage between each boss supporting the leaf spring and the friction pad, and four bosses of the leaf spring are inserted into each boss. The engagement is completed by engaging the corners.

According to the present invention, at the four corners of the leaf spring,
It is desirable to provide a projection that protrudes in the cylinder axis direction, and use the projection as a guide for assembly.

According to the present invention, a vertical wall for closing the assembling passage is provided adjacent to an edge of the two bosses located on one cylinder side in a direction away from the disk rotor. desirable. By providing the vertical wall in this manner, the position where it comes into contact with the vertical wall becomes the insertion end of the leaf spring, and assembling and positioning thereof are facilitated.

[0010] The present invention further provides that the two bosses located on the other cylinder side are adjacent to the edges in the direction away from the disk rotor, and the leaf spring supported by the boss is removed from the caliper body. It is desirable to provide a ridge that regulates the angle. Providing the ridges in this way not only stabilizes the support of the leaf spring, but also facilitates its positioning.

[0011]

Embodiments of the present invention will be described below with reference to the accompanying drawings.

In FIGS. 1 to 4, reference numeral 10 denotes a caliper main body, which has a pair of cylinders 11 and 12 which are opposed to each other with a disk rotor D interposed therebetween and is connected by a bridge 13 which straddles the disk rotor D. The bridge unit 13
It has a transmission structure having a square through hole 14 at the center thereof (FIG. 2), and the through hole 14 is provided in the caliper body 10.
And is covered by a leaf spring 15 described later. In FIG. 2, the leaf spring 15 is hatched for easy understanding.

In this embodiment, the caliper body 10
Is composed of a first cylinder block 16 and a second cylinder block 17, which are separately formed, using the inside of the bridge portion 13 as a dividing surface. Each of the first and second cylinder blocks 16 and 17 has a main body 16 provided with bores (cylinders) 20 and 21 for accommodating pistons 18 and 19.
a, 17a, and a pair of protrusions 16b, 17b extending from the main body portions 16a, 17a.
b and 17b are in contact with each other, and a pair of bolts 2
2 are integrated. That is, the first and second
Body parts 16a, 17a of the cylinder blocks 16, 17
Are the cylinder parts 11, 12 of the caliper body 10, respectively.
The projections 16b and 17b of the two cooperate to form the bridge 13 of the caliper body 10.

A bore 2 for accommodating the pistons 18, 19
0 and 21 are the first and second cylinder blocks 16 and 17
Are coaxially opposed to each other in an integrated state, and the spaces therebetween are communicated with each other by a fluid passage (not shown) formed in one of the pair of protrusions 16b, 17b constituting the bridge 13. Have been. The brake fluid is supplied to the bore 20 in the first cylinder block 16 through a port 23 a (FIG. 3) in a boss 23 protruding from the back surface of the first cylinder block 16. Brake fluid is supplied to the bore 21 in the second cylinder block 17 via the fluid passage, whereby the two pistons 18 and 19 are moved to the corresponding bores 20 and 2.
It comes to project from 1 synchronously. Note that the first and second
Each of the cylinder blocks 16 and 17 is provided with bleeders 24 and 25 for discharging air mixed in the brake fluid.

The first and second cylinder blocks 16 and 17 are provided with pin bosses 26 and 27 protruding from the main body portions 16a and 17a, respectively. Between the pair of friction pads 2
Pins 28 supporting 9, 30 are bridged (FIG. 3). Each of the friction pads 29, 30 has a rectangular back plate 29.
a, 30a and a lining material 29b joined to the back plate,
The pins 28 slidably pass through the respective back plates 29a and 30a. The pair of friction pads 29 and 30 are arranged so as to sandwich the disk rotor D, and are pressed against both surfaces of the disk rotor D by the two pistons 18 and 19 projecting in synchronization. Each of the first and second cylinder blocks 16 and 17 is provided with a torque receiver (not shown) located around the bores 20 and 21, and the back plates 29 a and 30 a of the friction pads 29 and 30 are provided. A predetermined braking force is generated by the side surface of the abutment contacting the torque receiver. The pin 28
The clip 31 prevents the pin bosses 26 and 27 from coming off.

Here, the leaf spring 15 covering the through hole 14 of the bridge portion 13 is also used for controlling the attitude of the pair of friction pads 29 and 30, and the first and second springs constituting the caliper body 10. Each of the cylinder blocks 16 and 17 is provided with a pair of bosses 32A, 32B, 33A and 33B for supporting two corners of the leaf spring 15. 5 and 6, the leaf spring 15 includes a flat plate portion 15a, a curved portion 15b rising from both sides of the flat plate portion 15a, and a flat claw portion 15c connected to the both curved portions 15b. And the claw portion 15 is provided.
c (both corners) are the bosses 32A, 32B,
33A and 33B. The leaf spring 15 is also provided with projections 15d as extensions of the claws 15c at its four corners. The leaf spring 15 is supported by the bosses 32A, 32B, 33A, 33B, and the curved portions 15b on both sides of the flat plate portion 15a are brought into contact with the back plates 29a, 30a of the friction pads 29, 30. , Which are resiliently biased, whereby each friction pad 29, 30
Is controlled so as to be parallel to the surface of the disk rotor D.

When viewed in the axial direction of each of the bores 20 and 21 of the caliper body 10 (hereinafter referred to as the cylinder axial direction), each of the bosses 32A, 32B, 33A and 33B and each friction pad 29,
A predetermined gap 34 is formed between the rear plate 30 and the back plates 29a, 30a (FIG. 1). This gap 34
The leaf spring 15 is used as an assembling passage for assembling the leaf spring 15, and the assembling of the leaf spring 15 will be described later in detail. A pair of bosses 32A and 32B provided on the first cylinder block 16 is provided with a ridge 35 at a portion adjacent to an edge in a direction away from the disk rotor D. On the other hand, the pair of boss portions 33A and 33B provided in the second cylinder block 17 and the portion adjacent to the edge in the direction away from the disk rotor D closes the gap (assembly passage). A vertical wall 36 is provided. The above-mentioned ridge 35 and vertical wall 3
6, as shown in FIG.
Is slightly larger than the entire length of the leaf spring 15 including the boss portions 32A, 32A.
B, 33A and 33B are held in a fitted state, and their positions are floating.

In the present embodiment, the first and second cylinder blocks 16, 1
7 are formed by casting, pin bosses 26 and 27 for mounting the pins 28, bosses 32A, 32B, 33A and 33B for supporting the leaf spring 15, ridges 35 and vertical walls adjacent to these bosses. 36 and the like are integrally formed with the respective cylinder blocks 16 and 17 by casting.
The inner surfaces of the bores 20 and 21 of the first and second cylinder blocks 16 and 17 and the tips (matching surfaces) of the protrusions 16b and 17b are finished by machining, and when assembling the disc brake, each bore 20, After the pistons 18 and 19 are placed in the first cylinder block 21, the first cylinder block 16 and the second cylinder block 17 are joined together and tightened and integrated with bolts 22. Next, while inserting the pin 28 into the pin boss portions 26 and 27, the pair of friction pads 29 and 30 is suspended and supported by the pin 28. At this time, the caliper body 1
0, as shown in FIG. 7 and FIG.
Is positioned so that it faces upward.

Thereafter, as shown in FIGS. 7 and 8, first, the first cylinder block 1 constituting the caliper body 10 is formed.
A projection 15d, which is an extension of the claw 15c of the leaf spring 15, is inserted into the assembly passage (gap) 34 from the sixth side. Then, as shown in FIG. 8, the leaf spring 15 is lifted in the direction of arrow C, and is elastically deformed so that the curved portion 15b is accommodated in the assembling passage 34. In this state, it is indicated by arrow D in FIG. Thus, the leaf spring 15 is pushed (inserted) into the caliper body 10. By this pushing, the leaf spring 15 is moved to the caliper body 1.
0 to the second cylinder block 17 side, and finally the projection 15d at the tip collides with the vertical wall 36, and the leaf spring 15
Is stopped. When the lifting force of the leaf spring 15 is released at the same time as the movement of the leaf spring 15 is stopped, the four corners of the leaf spring 15 are moved to the respective bosses 32A, 32B, 33A, 3A.
3B, and each of the friction pads 29, 30
Is attitude-controlled. At this time, each boss 32A, 32B,
The leaf spring 15 is fixed in position between the ridge 35 and the vertical wall 36 adjacent to 33A, 33B, and does not come off from the caliper body 10 due to vibration or the like during use.

The disc brake in the present embodiment is of a torque link type. One side of the first cylinder block 16 constituting the caliper body 10 has a torque link 40 (see FIG. ) Are integrally provided. Also, the protrusion 16b of the first cylinder block 16
Two screw holes 38 used for attachment to a vehicle are provided in a portion opposite to the side provided with. Torque link 4
Numeral 0 extends from a swing arm 41 of a vehicle (two-wheeled vehicle) as shown in FIG. 9, and the caliper body 10 is attached to the swing arm 41 via a bracket 42. The bracket 42 is swingably attached to the swing arm 41 using a pin 43, while the caliper body 1 is
Numeral 0 is fixed to the bracket 42 by mounting bolts 44 screwed into the screw holes 38. In this mounted state, the caliper body 10 is
3 down and its first cylinder block 16
Is set outside the vehicle, and the disk rotor D is positioned between the pair of friction pads 29 and 30 supported by the pins 28 (FIG. 3).

In the disc brake mounted on the vehicle as described above, the two bores 20 of the caliper body 10
When the brake fluid is supplied into the bore 21, the pistons 18 and 19 in each of the bores 20 and 21 protrude, and the pair of friction pads 2
9 and 30 are pressed against both sides of the disk rotor D, respectively. At this time, the torque applied to each of the friction pads 29, 30 is transmitted through the first and second back plates 29a, 30a.
At the same time as being received by a torque receiver (not shown) provided on the cylinder blocks 16 and 17 of the
Is received by the swing arm 41 via the torque link 40, and a desired braking force is generated.

In the above embodiment, when the leaf spring 15 is assembled, the leaf spring 15 is inserted from the side of the first cylinder block 16 disposed outside the vehicle. The structure in which the assembly direction of the leaf spring 15 is reversed may be adopted. In this case, a vertical wall 36 functioning as a collision wall of the leaf spring 15 is provided on the first cylinder block 16, and a ridge 35 for restricting the leaf spring 15 from coming off is provided on the second cylinder block 17. With such a structure, the assembling passage 34 of the leaf spring 15 can be hidden from the outside, and removal of the leaf spring 15 due to tampering can be prevented.

[0023]

As described above in detail, according to the disk brake of the present invention, the leaf spring can be inserted into the caliper main body from the cylinder axial direction, and the leaf spring can be assembled with one touch, and the structure can be screwed. Compared with this, not only the number of processing steps and the number of parts are reduced, but also the assembling workability is improved, which greatly contributes to cost reduction.

[Brief description of the drawings]

FIG. 1 is a front view showing the structure of a disc brake according to the present invention.

FIG. 2 is a plan view showing the structure of the present disc brake.

FIG. 3 is a sectional view taken along line AA of FIG. 1;

FIG. 4 is a sectional view taken along line BB of FIG. 2;

FIG. 5 is a sectional view showing a shape of a leaf spring used in the present invention.

FIG. 6 is a plan view showing a shape of a leaf spring used in the present invention.

FIG. 7 is a plan view showing a procedure for assembling a leaf spring to a caliper body.

FIG. 8 is a front view showing a procedure for assembling the leaf spring to the caliper body.

FIG. 9 is a schematic diagram showing a state in which a disc brake according to an embodiment of the present invention is mounted on a vehicle.

FIG. 10 is a plan view showing a mounting structure of a leaf spring in a conventional disc brake.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Caliper 11, 12 Cylinder part 13 Bridge part 14 Through-hole 15 Leaf spring 15d Leaf spring projection 16 First cylinder block 17 Second cylinder block 18, 19 Piston 20, 21 Cylinder bore 28 Pin 29, 30 Friction pad 32A, 32B Boss portion of first cylinder block 33A, 33B Boss portion of second cylinder block 34 Gap (assembly passage) 35 Protrusion 36 Vertical wall D Disk rotor

Claims (4)

[Claims] An opposing cylinder-type caliper body, comprising a pair of cylinder portions opposed to each other with a disk rotor interposed therebetween connected by a bridge portion having a transmission structure straddling the disk rotor, is attached to a non-rotating portion of a vehicle. A pad bridged between a pair of cylinder portions supports a pair of friction pads pressed against both surfaces of the disk rotor, and the caliper body has a pad spring for controlling the posture of each friction pad and a through hole of the bridge portion. A disc brake supporting a rectangular leaf spring functioning as a cover for covering the bosses, wherein the caliper main body is provided with boss portions for supporting at least four corners of the leaf spring, and each of the bosses is viewed in the cylinder axis direction. A gap formed between the portion and the friction pad is used as an assembly passage of the leaf spring. Disc brake. 2. The disc brake according to claim 1, wherein projections projecting in the cylinder axial direction are provided at four corners of the leaf spring. 3. A vertical wall for closing an assembling passage is provided adjacent to an edge of the two bosses located on one cylinder side in a direction away from the disk rotor. 3. The disc brake according to 1 or 2. 4. The two boss portions located on the other cylinder portion side are adjacent to the edge in the direction away from the disk rotor, and regulate the removal of the leaf spring supported by the boss portion from the caliper main body. The disk brake according to claim 1, 2 or 3, further comprising a ridge.