JPH1047395A - Disk brake device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To facilitate assembly and replacement of a friction pad, in a disk brake device supporting a pair of the friction pads by a pad guide pin slidably in an axial direction of a disk rotor. SOLUTION: A pad guide pin 25, inserted to a pair of friction pads 2, 3 to hold both end parts to a caliper body 25, is extensible and contractible and by compressing, the both end parts fitted to pin support holes 15b, 16b of leg parts 6, 16 of the caliper body 25 are come off from the leg parts 15, 16. The pad guide pin 26 is provided removably from the caliper body 25 together with a pair of the friction pads 2, 3 inserting the pad guide pin 26.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION The present invention relates to a disk rotor having a pair of friction pads opposed to each other with a disk rotor interposed therebetween, the pad guide pins being fitted into pin support holes formed in the legs of the caliper body in the axial direction of the disk rotor. The present invention relates to a disk brake device slidably supported on a disc brake device.

[0002]

2. Description of the Related Art A conventional disc brake device using a pad guide pin disclosed in, for example, Japanese Patent Publication No. 7-35828 will be described with reference to FIGS.
The disc brake device includes a pair of friction pads 2 and 3 opposed to each other with a disc rotor 1 interposed therebetween, a caliper body 5 having a built-in piston for pressing the friction pads 2 and 3 against the disc rotor 1, and a vehicle body. And the like, and a pad guide pin 9 for supporting the pair of friction pads 2 and 3 on the caliper body 5 slidably in the axial direction of the disk rotor 1. It is configured.

Here, the friction pads 2 and 3 are pressed against the surface of the disk rotor 1 to generate a predetermined frictional force, and a metal which is fixed to the back side of the lining 11 and functions as a mounting bracket. And a back plate 12 made of the same. A pin insertion hole 13 through which the pad guide pin 9 is slidably inserted is formed through the upper edge of the back plate 12.

The caliper body 5 has friction pads 2 and 3
Pair of legs 15, 1 located on the back side (back plate 12 side) of
6 and connecting portions 15a, 16a projecting from the upper ends of the legs 15, 16 to connect the legs 15, 16 to each other.
And In the case of this example, each leg 15, 16 is
As shown in FIG. 3, the connecting portions 15a and 16a are brought into contact with each other, and
By screwing the screw member 18 inserted through a to the other connecting portion 16a, the screw member 18 is integrally connected and fixed.

[0005] The disc brake device shown here is a so-called opposing piston type.
As shown in FIG. 1, each of the legs 15 and 16 is provided with a cylinder 21 containing a piston 20 for pressing the friction pads 2 and 3 against the disk rotor 1.
Hydraulic oil is supplied into the cylinder portion 21 in response to operation of a brake operation unit such as a brake pedal (not shown), and the piston 20 is moved forward and backward by the hydraulic oil supplied into the cylinder portion 21.

In this example, the pad guide pins 9
As shown in FIG. 6, a pair of disk rotors 1 are provided apart from each other in the radial direction. Each pad guide pin 9 is formed of a metal round bar having a constant outer diameter, and penetrates through a pin insertion hole 13 formed in the back plate 12 of each friction pad 2, 3 to form each friction pad 2, 3. Of the caliper body 5 are fitted into pin support holes 15b and 16b formed in the legs 15 and 16 of the caliper body 5, respectively. The pin support hole 15b of the leg 15 is a hole having a predetermined depth formed from the side of the leg 16, and the pin support hole 16b of the leg 16 is formed through. Therefore, the pad guide pins 9
It can be attached to the caliper body 5 by being inserted from the pin support hole 16b side. On the outer periphery of the pad guide pin 9,
As shown in FIG. 6, a clip mounting groove for mounting the clip member 23 for retaining is formed. In addition, as the clip member 23, a retaining ring or a cotter pin can be used.

In the case of the disk brake device having the above-described structure,
As shown in FIG. 6, a friction pad 2 is attached to a caliper body 5,
In order to assemble No. 3, work is performed in the following procedure. First,
The connecting portions 15a and 16a of the pair of legs 15 and 16 are connected and fixed to each other by a screw member 18, so that the legs 15 and 16 are integrated. Next, a pair of friction pads 2 and 3 are inserted between the legs 15 and 16, and these friction pads 2 and 3 are inserted.
The positions of the friction pads 2 and 3 with respect to the caliper body 5 were adjusted so that the position of the upper pin insertion hole 13 was aligned with the pin support holes 15b and 16b on the legs 15 and 16, and this position was adjusted. In this state, the pad guide pins 9 are inserted along the axial direction of the disk rotor 1 from the pin support holes 16b while supporting the pair of friction pads 2 and 3. Then, the pad guide pin 9 is provided in the pin insertion hole 1 of the pair of friction pads 2 and 3.
When the both ends of the pad guide pin 9 are fitted into the pin support holes 15b and 16b, the clip member 23 is attached to the pad guide pin 9. When removing the friction pads 2 and 3 from the caliper body 5, the operation is performed in a procedure reverse to that of the assembling.

[0008]

However, in such a disc brake device, when assembling or replacing the friction pads 2 and 3 with the caliper body 5, as described above, the pad guide pins 9 are not used. Therefore, the work of attaching and detaching the clip member 23, which is a separate member, is required. Therefore, attaching and detaching the clip member 23 requires considerable labor. When removing the friction pads 2 and 3 from the caliper body 5, the pad guide pins 9 penetrating through the friction pads 2 and 3 are used.
Must be completely removed from the friction pads 2 and 3, and therefore, the removal of the pad guide pins 9 also requires time and effort. Further, when attaching the new friction pads 2 and 3 to the caliper body 5, the positions of the pin insertion holes 13 of the friction pads 2 and 3 correspond to the pin support holes 1 on the caliper body 5 side.
The pair of friction pads 2 and 3 must be positioned in a predetermined positional relationship with respect to the caliper body 5 and must be firmly supported so as to coincide with the positions of 5b and 16b. The work became complicated due to the positioning and support of the car. That is, in the conventional disk brake device, a great deal of labor and labor was required when assembling and replacing the friction pads 2 and 3.

The present invention has been made in view of the above circumstances,
A disc brake device for supporting a pair of friction pads slidably in an axial direction of a disc rotor by pad guide pins penetrating the pair of friction pads, wherein the friction pad can be easily assembled or replaced. The purpose is to provide.

[0010]

A disk brake device according to the present invention for achieving the above object has a pair of friction pads opposed to each other with a disk rotor interposed therebetween, and is located on the back side of each friction pad. A caliper body comprising a pair of legs and a connecting portion for connecting the legs to each other, and having a piston for pressing at least one of the friction pads against the disk rotor; and penetrating an end of the pair of friction pads. A pad that projects from the rear side of each friction pad into a pin support hole formed in a leg of the caliper body to support the pair of friction pads slidably in the axial direction of the disk rotor. In a disc brake device having a guide pin,
The pad guide pin is provided so as to be capable of extending and contracting in the axial direction of the disk rotor, and the pin portion, which has been fitted into the pin support hole of the caliper body, is disengaged from the leg portion by being compressed, and is separated from the caliper body together with each friction pad. It is characterized by being provided detachably.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of a disc brake device according to the present invention will be described below in detail with reference to the drawings. 1 and 2 show a first embodiment of a disc brake device according to the present invention. FIG. 1 is a sectional view of a main part of the disc brake device, and FIG. 2 is a pad for assembling or replacing a friction pad. It is principal part sectional drawing explaining the effect | action of a guide pin.

The disc brake device 24 includes a pair of friction pads 2 and 3 opposed to each other with the disc rotor 1 interposed therebetween, and a caliper body having a built-in piston for pressing the friction pads 2 and 3 against the disc rotor 1. 25, a support (not shown) attached to the vehicle body or the like to support the caliper body 25, and a pad guide pin for supporting the pair of friction pads 2 and 3 on the caliper body 25 slidably in the axial direction of the disk rotor 1. 26.

As shown in FIG. 1, the friction pads 2 and 3 are fixed to a lining portion 11 which generates a predetermined frictional force by being pressed against the surface of the disk rotor 1 and a back surface of the lining portion 11. And a metal back plate 12 functioning as a mounting bracket. A pin insertion hole 13 through which the pad guide pin 26 is slidably inserted is formed through the upper edge of the back plate 12.

The caliper body 25 includes the friction pads 2,
A pair of legs 15 located on the back side (back plate 12 side) of 3;
16 and a connecting portion (not shown) for connecting these legs 15 and 16 to each other. The disc brake device 24 in this embodiment is a so-called opposing piston type, and although not shown, friction pads 2 and 3 are respectively attached to the legs 15 and 16 to the disc rotor 1. It is equipped with a cylinder that houses the piston to be pressed. Hydraulic oil is supplied into the cylinder unit in response to operation of a brake operation unit such as a brake pedal (not shown), and the piston is moved forward and backward by the hydraulic oil supplied into the cylinder unit.

The pad guide pin 26 is formed separately from the intermediate shaft 28, both ends of which are provided in a hollow cylindrical shape, and the base end thereof is slidable in the hollow portion 29 of the intermediate shaft 28. And a headed cylindrical cap 32 fitted to both ends of the intermediate shaft 28 to prevent the end shaft 30 from dropping out of the hollow portion 29.
And the end shaft 30 is incorporated into the hollow portion 29 so as to contact the base end surface of the end shaft 30 and the inner bottom surface of the hollow portion 29.
Spring 33 for urging the protruding portion in a direction protruding from the intermediate shaft 28.
And can be compressed by pressing both ends (tips of the end shafts 30).

At the tip end of the end shaft 30, pin support holes 15b formed in the legs 15, 16 of the caliper body 25,
A pin portion 30a is formed so as to be fitted into 16b. Each of the pin support holes 15b and 16b is formed through. End shaft 30 fitted in hollow portion 29
Has a larger diameter than the pin portion 30a, so that a step 30b is formed at the boundary between the base portion that fits into the hollow portion 29 and the pin portion 30a. .

The cap 32 has a tubular portion 32a fitted to the outer periphery of the end of the pad guide pin 26, and projects from the tip of the tubular portion 32a to the inner diameter side so that the step 30b abuts to prevent the end shaft 30 from coming off. And a ring-shaped flange portion 32b for preventing. In the case of this embodiment, the inner diameter of the cylindrical portion 32a is dimensioned so as to be tightly fitted to the outer diameter of the intermediate shaft 28. And the cylindrical portion 32
After press-fitting a into the intermediate shaft 28, the cap 32 is fixed to the end of the intermediate shaft 28 by caulking a part of the cylindrical portion 32a in the inner diameter direction.

The pad guide pins 26 press the end shafts 30 at both ends in the axial direction by the above-described structure, and
The end (pin portion 30 a) fitted into the pin support holes 15 b, 16 b of the legs 15, 16 of the caliper body is compressed from the legs 15, 16. The stroke of each end shaft 30 and the length of the pin portion 30a are set so that the end portion shaft 30 can be detached from the caliper body 25 together with the pair of friction pads 2 and 3.

The inner diameter of the pin insertion hole 13 formed in the back plate 12 of each of the friction pads 2 and 3 is set so that the cylindrical portion 32a of the cap 32 can be inserted. As shown in FIG. 1, the pad guide pin 26 has the flange portion 32 b of the cap 32 and the leg portion 15, 16 in the state where the pin portion 30 a of the end shaft 30 is fitted in the pin support holes 15 b, 16 b. By contacting the inner wall, movement in the axial direction is restricted,
It will be locked.

In the disc brake device 24 having the above structure, the pad guide pins 26 are partially assembled in advance through the pair of friction pads 2 and 3. Together with the friction pads 2 and 3 of the caliper body 25.

Therefore, when assembling the pair of friction pads 2, 3 to the caliper body 25, each of the friction pads 2, 3
Are individually positioned with respect to the caliper body 25,
The conventional troublesome work of inserting the pad guide pins 26 while firmly supporting the positioned friction pads 2 and 3 can be eliminated. Also, when removing the pair of friction pads 2 and 3 from the caliper body 25, FIG.
As shown in FIG.
A shaft member 34 that can be inserted through the pin support holes 15b and 16b.
, And only need to be compressed in a state of being housed in the hollow portion 29 of the intermediate shaft 28, and it is not necessary to completely remove the friction pads 2 and 3.

The pad guide pins 26 are released from the compressed state by releasing the pressure applied to the end shafts 30 and are extended, so that the pin portions 30a of the end shafts 30 at both ends become pin support holes 15b of the caliper body 25. , 16b. that time,
A step 30b provided at the boundary between the base end of the end shaft 30 and the pin 30a abuts against the inner wall surfaces of the legs 15, 16 and fits into the pin support holes 15b, 16b of the pin 30a. Regulate length. Therefore, the pad guide pin 26 can be connected to the caliper body 2 without using a separate clip.
5 can be retained.

Accordingly, the assembling and removing operations of the friction pads 2 and 3 with respect to the caliper body 25 can be achieved quickly with a small number of work steps, and the assembling and replacement of the friction pads 2 and 3 are facilitated.

FIGS. 3 and 4 show a second embodiment of the disc brake device according to the present invention. FIG. 3 is a sectional view of a main part of the disc brake device, and FIG. FIG. 9 is a cross-sectional view of a main part for explaining the operation of the guide pin at that time. In the disc brake device 36 of this embodiment, the pair of friction pads 2 and 3
The structure of the pad guide pin 38, which is slidably supported in the axial direction of the caliper body 25, is devised.
The configuration other than the pad guide pins 38 is substantially the same as that of the first embodiment. Therefore, the same components as those of the first embodiment are denoted by the same reference numerals, and description thereof is omitted.

The pad guide pins 38 in this embodiment
Are first and second fitted to each other slidably in the axial direction.
And the two shaft members 40, 41
1 and a compression spring 43 that urges each other in a direction away from each other. The first shaft member 40 has
Pin support hole 15 in one leg 15 of caliper body 25
and a cylindrical portion 40b on the base end side of which the base end portion of the second shaft member 41 is slidably fitted. Cylindrical part 4
0b is set to be larger than the outer diameter of the pin portion 40a.
At the boundary with 0a, a step 40c is formed which abuts on the inner surface of one leg 15 and regulates the length of the pin portion 40a fitted into the pin support hole 15b.

The second shaft member 41 has a pin portion 41a on the distal end side that can be fitted into the pin support hole 16b of the other leg 16 of the caliper body 25, and a first end portion on the proximal end side.
The shaft member 40 is provided with a fitting shaft portion 41b fitted into the hollow portion 40d on the base end side. In the case of the second shaft member 41, a pad fitting portion 41c that fits into the pin insertion hole 13 on the back plate 12 of the friction pad 3 is formed between the pin portion 41a and the fitting shaft portion 41b. Have been. The pad fitting portion 41c is set to have a larger diameter than the pin portion 41a, so that the boundary between the pin portion 41a and the pad fitting portion 41c is brought into contact with the inner surface of the other leg portion 16. A step 41d is formed which is in contact with the pin portion 41a and regulates the length of the pin portion 41a fitted into the pin support hole 16b.

The compression spring 43 has a winding diameter of the first shaft member 4.
0 is a compression coil spring set so as to be accommodated in the hollow portion 40d.

The pad guide pins 38 press the pin portions 40a and 41a at both ends in the axial direction by the above-described structure.
The fitting shaft portion 41b of the second shaft member 41 is
It is made to be able to expand and contract by appearing in the hollow part 40d of
The pin support hole 15 of the caliper body is compressed.
b, 16b (pin portions 40a, 41)
a) is detached from the caliper body 25 together with the pair of friction pads 2 and 3 through which the pad guide pins 38 penetrate so that the pad guide pins 38 can be removed from the caliper body 25.
The movement stroke of the shaft member 41 and the pin portions 40a,
The length of 1a is set.

In this embodiment, as in the previous embodiment, the pad guide pins 38 are compressed as shown in FIG. 4 so that the pad guide pins 38 pass through the friction pads 2 and 3. The friction pads 2 and 3 and the pad guide pins 38 can be collectively attached to and detached from the caliper body 25. Therefore, the work of assembling and removing the friction pads 2 and 3 with respect to the caliper body 25 is reduced. This can be achieved quickly in the process, and the assembling and replacement of the friction pads 2 and 3 become easy.

The disc brake device according to each of the above-described embodiments is of a so-called opposed piston type, and a friction pad 2 is provided on each of the two legs of the caliper body.
3 is provided with a piston for pressing the disc 3 against the disk rotor 1. However, the disc brake device according to the present invention can also be applied to a disc brake device in which a piston for pressing the friction pads 2 and 3 against the disc rotor 1 is provided only on one leg of the caliper body.

Further, the specific structure of the pad guide pin that enables the friction pads 2 and 3 to slide in the axial direction of the disk rotor 1 is not limited to the above-described embodiments.

[0032]

According to the disc brake device of the present invention, if the pad guide pins are partially assembled in advance through the pair of friction pads and the pad guide pins are compressed in that state, the pair of friction pads can be connected to each other. The pad guide pins can be put in and out of the caliper body at once. Therefore, when assembling a pair of friction pads to the caliper body, the conventional troublesome operation of individually positioning each friction pad with respect to the caliper body and inserting the pad guide pins while firmly supporting the positioned friction pads is performed. Work is unnecessary. Also, when removing the pair of friction pads from the caliper body, it is not necessary to completely remove the pad guide pins from the pair of friction pads, and it is only necessary to slightly compress the pad guide pins. Further, since the pad guide pins can be fitted into the pin support holes provided on the legs of the caliper body by expanding the pad guide pins from the compressed state, the pad guide pins can be inserted into the pin support holes at both ends or ends of the pad guide pins. By providing a step or the like for regulating the fitting length of the pad guide pin, the pad guide pin can be prevented from coming off from the caliper body without using a separate clip. Therefore, the work of assembling and removing the pair of friction pads with respect to the caliper body can be achieved quickly with a small number of work steps, and the assembly and replacement of the friction pads become easy.

[Brief description of the drawings]

FIG. 1 is a sectional view of a main part of a disc brake device according to a first embodiment of the present invention.

FIG. 2 is a sectional view of an essential part for explaining the operation of a pad guide pin applied to the disc brake device of FIG. 1;

FIG. 3 is a sectional view of a main part of a second embodiment of the disc brake device according to the present invention.

FIG. 4 is a cross-sectional view of a principal part explaining the operation of a pad guide pin applied to the disc brake device of FIG. 3;

FIG. 5 is a front view of a conventional disc brake device.

6 is a view as viewed in the direction of the arrow A in FIG. 5;

FIG. 7 is a sectional view taken along the line BB of FIG. 5;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Disc rotor 2, 3 Friction pad 12 Back plate 13 Pin insertion hole 15, 16 Leg 15b, 16b Pin support hole 24, 36 Disc brake device 25 Caliper body 26, 38 Pad guide pin 28 Intermediate shaft 30 End shaft 30a, 40a, 41a Pin portion 30b, 40c, 41d Step 33, 43 Compression spring

Claims (1)

[Claims] A pair of friction pads opposed to each other with a disk rotor interposed therebetween, a pair of legs located on the back side of each friction pad, and a connecting portion connecting the legs to each other; A caliper body equipped with a piston for pressing at least one of the pads against the disk rotor; and a pin portion penetrating through the ends of the pair of friction pads and projecting from the rear side of each of the friction pads. A pad guide pin which is fitted into a pin support hole formed in a portion and slidably supports the pair of friction pads in the axial direction of the disk rotor. The pad guide pin is a shaft of the disk rotor. The pin portion fitted into the pin support hole of the caliper body by compression A disc brake device, which is provided detachably from the caliper body together with the friction pads so as to be detached from the leg portions.