JP2570814Y2 - Disc brake - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a disc brake mounted on an automobile or the like.

[0002]

2. Description of the Related Art Conventionally, a disc brake has been pressed against a disc by sandwiching a pad slidably supported in the axial direction of the disc by a pad guide between a piston of a caliper and a claw portion. Was to be braked. As shown in Japanese Utility Model Publication No. 3-1632, a return spring is provided on a pad of this type of disc brake. The return spring biases the pad in a direction away from the disk, and prevents the pad from being dragged by the disk when the brake is released by the return spring.

[0003]

[Problems to be Solved by the Invention] When a pad is incorporated into a disc brake, the procedure is as follows. First, a pad is supported on a pad guide of a carrier, a return spring is mounted, and then a caliper is assembled. . When replacing the worn pad, remove one of the pins connecting the carrier and the caliper on both sides, rotate the caliper about the other pin, remove the worn pad, and remove the new pad. The pad is supported by the pad guide, the return spring is attached, and then the caliper is turned in the opposite direction,
The work of attaching one pin was performed. However, in the above-described conventional disc brake, when the return spring is mounted on the pad in the above-described pad mounting and replacement work, the pad moves in a direction away from the disk due to the urging force of the return spring and falls off the pad guide. In some cases, the operation of installing the pad at the time of assembling the disc brake or exchanging the pad may be hindered. This invention has been made in view of the above circumstances, and an object of the invention is to provide a disc brake which can perform pad installation and replacement work extremely efficiently.

[0004]

The disk brake of the present invention is provided with a pair of friction pads for sandwiching the disk on a carrier fixed to a non-rotating portion of a vehicle, and the friction of the carrier is provided.
The pad both ends, of the disc the friction pad by sandwiching from above and below the backing of the friction pad by the bent portion formed on the pressing portion and a lower end formed in the upper end
A pair of pad guides that slidably hold in the axial direction
A caliper that presses the pair of friction pads against the disk is provided at a position straddling the disk, and a return spring that biases the friction pad in a direction away from the disk is provided. Is
The return spring is locked to both sides of the pressing portion by locking the pressing surface side of the friction pad near the upper end of the back metal opposite to the contact surface that contacts the disk.
The frictional force in the axial direction of the disc due to the urging force of
A regulating piece that regulates separation due to the movement of the pad is integrally formed
Is characterized in that the composed.

[0005]

According to the disc brake of the present invention, a return spring is attached to the pressing portion provided on the pad guide .
Since the regulating piece that regulates the movement of the friction pad in the axial direction of the disk by the force is integrally formed, the friction pad can be reliably positioned when the friction pad is assembled. That is, the friction pad is prevented from falling off from the pad guide due to the urging force of the return spring mounted on the friction pad, and the work efficiency of assembling and replacing the friction pad can be greatly improved. Further, by sandwiching the backing plate of the friction pad from above and below by the bent portion formed on the pressing portion and a lower end which is formed on the upper end of the pad guide, the friction pad de
Since it holds the friction pad slidably in the axial direction of the disc , the friction pad can be held on the carrier very easily by fitting the back metal of the friction pad between the pressing portion and the bent portion, and assembling. Work efficiency can be further improved.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a disc brake according to the present invention will be described below with reference to FIGS. In the figure, reference numeral 1 denotes a disc brake. The disc brake 1 includes a carrier 2, a caliper 3 slidably provided over the carrier 2, and a pair of pads 6, 6 (friction) provided on the caliper 3 at positions sandwiching the disc 4. Pads). The pads 6, 6 are slidably supported by pad guides 7, 7 in a direction perpendicular to the disk 4.

In the disc brake 1, a return spring 8 is provided on the pads 6, 6 to reduce the drag of the pads 6, 6 by the disc 4. The return spring 8 is provided with back metal 6a, 6 of the pad 6, 6.
a, which is mounted by inserting both ends into the locking holes formed in the disk 4.
, The drag of the pads 6 and 6 when the brake is released is reduced.
As shown in FIGS. 3 to 5, each of the pad guides 7, 7 is roughly composed of a base 11, a retaining portion 12, and a pressing portion 13. The base 11 includes a pair of legs 15, 15.
And a bridge portion 16 connecting these legs 15, 15 at their upper ends. A bent portion 17, bent in the direction of the pads 6, 6, is provided at the lower ends of the pair of legs 15, 15.
17 are formed.

[0008] The pad guides 7, 7 have legs 15, 15 and a bridge portion 16 in contact with the inner wall of the carrier 2, and bent portions 17, 17 are formed on the step portions 2 a, 2 a formed on the carrier 2. The bridge portion 16 is supported so as to straddle the disk 4 by being in contact with the disk 4. The retaining portion 12 extends from the lower end of the bridge portion 16 of the base portion 11 in the direction opposite to the bent portions 17, that is, the pads 6.
The carrier 2 is bent in a direction away from the carrier 6 and is brought into contact with the lower surfaces of the connecting portions 22 of the carrier 2 that slidably connect the caliper 3 by pins 21 and 21. The stopper portion 12 abuts against the connecting portions 22, 22 to apply elastic force to the connecting portions 22, 22 to prevent the pad guides 7, 7 from coming out of the carrier 2. In addition, the pressing portion 13 is a bent portion 2
It is connected to the base 11 via 3 and 23. Bending part 2
The reference numerals 3 and 23 are formed to extend upward from the upper end of the base 11 and bend downward, so as to apply a downward urging force to the pressing portion 13.

At both ends of the pressing portion 13, regulating pieces 25, 25 for regulating the movement of the pads 6, 6 in the axial direction of the disk 4 are formed. These control pieces 2
5 and 25 are extended from both ends of the pressing portion 13 in a direction away from each other in the axial direction of the disk 4, and further, the tips 25 a and 25 a are formed in a shape bent inward in the radial direction of the disk 4. These restriction pieces 25, 2
5 between the tip portions 25a, 25a (see FIG. 6)
However, it is substantially the same as the dimension L3 (see FIG. 7) between the outsides of the pads 6, 6 when the return spring 8 having the natural length dimension L2 between both ends is attached. That is,
Normally, the return spring 8 is mounted by simply inserting both ends of the return spring into the locking holes formed in the backing plates 6a, 6a of the pads 6, 6, so that the return spring 8 is deformed when the brake is not operated. In this state, both ends of the return spring 8 may fall out of the locking holes and fall off. However, according to the pad guides 7, the restricting pieces 25, 25 prevent the return spring 8 from moving in the axial direction of the disk 4. Even when the movement of the return spring 8 is restricted, the size of the both ends of the return spring 8 is set to L2 which is the natural length, so that the risk of the return spring 8 falling out of the locking hole can be eliminated. In addition, a regulating portion 2 is provided at the upper end of the base portion 11.
6 and 26 are formed to regulate the movement of the pads 6 and 6 outward in the radial direction of the disk 4.

According to the disk brake 1 having the above-described structure,
When the brake pedal is depressed, the piston 3a and the claw portion 3b of the caliper 3
Sandwich. Thereby, the rotation of the tire is weakened by the friction between the pads 6, 6 and the disk 4, and the vehicle is braked. When the brakes are released and the nip of the caliper 3 between the piston 3a and the claw portion 3b is released, the pads 6, 6 are moved in the directions away from the disk 4 by the urging force of the return spring 8. .
Next, the work of assembling the pads 6, 6 of the disc brake 1 of this embodiment and the work of replacing the worn pads 6, 6 will be described. In the case of assembling the pads 6, 6, first, the back metal 6 a of the pads 6, 6 a
7 and the pad 6,
6 is inserted between the pad guides 7 and 7 from the side.
a and 6a are turned outward. In this manner, both ends of the pads 6 and 6 are connected to the pad guides 7 and 7.
Between the bent portions 17, 17 and the pressing portions 13, 13 by being pressed downward by the pressing portions 13, 13,
The bent portions 17, 17 and the pressing portions 13, 13 sandwich the disc 4 from above and below, and are supported so as to be slidable in the axial direction of the disk 4.

In this state, the pads 6, 6
Insert and lock both ends of the return spring 8 into the locking holes formed in the upper portions of the back metal 6a, 6a.
Attach. In the case of replacement work due to wear of the pads 6 and 6, one of the pins 21 and 21 is first removed, and the caliper 3 is rotated about the pin 21 on the other side. In this state, the return spring 8 is removed, and the worn pads 6, 6 are removed from the pad guides 7, 7. After the pads 6 and 6 are supported by the pad guides 7 and 7 in the same manner as the assembling work of the pads 6 and 6, the return spring 8 is attached to the pads 6 and 6. When the return spring 8 is attached to the pads 6 and 6 during the above-described pad incorporation and replacement work, the pads 6 and 6 are urged and moved in a direction away from the disk 4. According to the example disc brake 1, both ends of the pressing portions 13, 13 of the pad guides 7, 7 have restricting pieces 25, which restrict the movement of the pads 6, 6 in the direction away from the disc 4,
The formation of the pad 25 prevents the pads 6, 6 from falling off the pad guides 7, 7.

As a result, the pads 6, 6 can be reliably held within the width L2 of the pad guides 8, 8, whereby the caliper 3, which is a step after the work of assembling and replacing the pads 6, 6, is performed. The caliper 3 can be mounted very easily at the time of assembling, and the working efficiency of assembling the disc brake 1 and replacing the pads 6 and 6 can be greatly improved. The dimension L4 (see FIG. 2) between the end face of the piston 3a and the inner face of the claw 3b is equal to or larger than the dimension L3 between the outer sides of the pads 6 and 6 (L3 ≦
If L4), the pads 6, 6 do not have to be pressed in the axial direction of the disc 4 when the caliper 3 is mounted, so that the assembling workability can be further improved. Note that the specific structure of the disc brake 1 of the above embodiment is not limited to the embodiment.

[0013]

As described above, according to the disc brake of the present invention, the following effects can be obtained.
On both sides of the pressing portion provided at the upper end of the pad guide, the pressing surface side opposite to the contact surface that comes into contact with the disk near the upper end of the back metal of the friction pad is locked , and the return spring is engaged.
When the return spring is mounted, the friction pad moves away from the disk when the return spring is mounted because the restriction piece that regulates the movement of the friction pad in the direction away from the disk due to the urging force of the ring is integrally formed. Can be prevented from dropping out of the pad guide due to excessive movement. Thereby, the state in which the friction pad is reliably supported by the pad guide can be maintained. This allows
At the time of assembling the caliper, which is a process after the assembling and replacing of the friction pad, the caliper can be mounted very easily, and the working efficiency can be greatly improved. In addition, the friction pad is sandwiched from above and below by the pressing portion formed at the upper end of the pad guide and the bent portion formed at the lower end of the pad guide from above and below.
Since the sliding pad is slidably held in the axial direction of the disc , the friction pad can be held on the carrier very easily by fitting the back metal of the friction pad between the pressing part and the bent part. Work efficiency can be further improved.

[Brief description of the drawings]

FIG. 1 is a plan view of a disc brake illustrating a structure of the disc brake of the present invention.

FIG. 2 is a cross-sectional view of the disk brake taken along line AA, illustrating the structure of the disk brake according to the present invention;

FIG. 3 is a perspective view of a pad guide mounted on the disc brake of the present invention.

FIG. 4 is a view in the direction of arrows B-B for explaining a mounting state of the pad guide to the disc brake of the present invention.

FIG. 5 is a view in the direction of the arrow C-C in which a claw portion is omitted for explaining a mounting state of the pad guide to the disc brake of the present invention.

FIG. 6 is a cross-sectional view of the pad guide taken along the line DD for explaining the dimensions of the pad guide of the present invention;

FIG. 7 is a plan view of a pad on which a return spring is mounted.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Disc brake 2 Carrier 3 Caliper 4 Disc 6 Pad (friction pad) 7 Pad guide 8 Return spring 13 Pressing part 25 Restriction piece

Claims (1)

(57) [Scope of request for utility model registration] 1. A pair of friction pads sandwiching the disk provided in a carrier which is fixed to a non-rotating portion of the vehicle, the carrier
The friction pad both ends, the de-said friction pad by sandwiching from above and below the backing of the friction pad by the bent portion formed on the pressing portion and a lower end formed in the upper end
A pair of pad guides for slidably holding the disc in the axial direction of the disc ; a caliper for pressing the pair of friction pads against the disc at a position straddling the disc; and separating the friction pad from the disc. A return spring that urges the pad guide on both sides of the pressing portion, a pressing surface side of the friction pad opposite to a contact surface that contacts the disk near an upper end of a back metal of the friction pad. Locking the return spr
The axial force of the disk caused by the urging force of the ring
A regulating piece that regulates separation due to movement of the friction pad is integrated
Disc brake characterized by being formed in .