JPS6347296Y2 - - Google Patents

Description

[Detailed explanation of the idea] This invention relates to disc brakes.

2. Description of the Related Art Pin slide type disc brakes are conventionally known in which a caliper is slidably attached to a carrier attached to a non-rotating part of a vehicle via a guide pin.

In this disc brake, an inner pad is guided between both arms of a carrier formed in a substantially U-shape, which are spaced apart in the rotational direction of the disc, and a guide pin is provided on each of these arms, while the outer circumference of the disc is A caliper housing a piston in one of a pair of legs facing both sides of the disk is provided with a guide hole extending in the axial direction of the disk, and the guide pin is slidably fitted into the guide hole, and the caliper is supported by the carrier so as to be slidable in the axial direction of the disk by passing the boot between the guide hole and the guide pin, and one pad (inner pad) is pressed against one side of the disk by the piston, The reaction force generated at this time causes the other leg of the caliper to press the other pad (outer pad) against the other side of the disk,
This brakes the rotating disk.

However, in such conventional disc brakes, no stopper is provided on the piston side of this inner pad in the inner pad guide space of the carrier.
During assembly, transportation, pad replacement, etc., there was a risk that the inner pad would come off and fall off from the pad guide portion of the carrier.

This idea was made in view of the above circumstances,
A boot protector is provided around the boot that extends between a guide hole formed in the caliper and a guide pin provided in the carrier, and a part of the boot protector is placed on the piston side of the inner pad in the pad guide space of the carrier. An object of the present invention is to provide a disc brake capable of preventing an inner pad from coming off and falling off from a pad guide part of a carrier by extending the inner pad to the pad guide part of the carrier.

An embodiment of this invention will be described below with reference to FIGS. 1 to 6. Reference numeral 1 in FIGS. 1 and 2 indicates a carrier attached to a non-rotating portion of a vehicle (not shown). The carrier 1 is formed into a substantially U-shape and has arms 3 and 4 spaced apart in the direction of rotation of the disk 2. Pad guide portions 5 and 6 are formed on these arms 3 and 4, respectively. Further, guide pins 7 and 8 are press-fitted and fixedly attached to the arms 3 and 4, respectively, so as to extend in the axial direction of the disk 2. guide pin 7,
A caliper 9 is slidably attached to the caliper 8.

This caliper 9 has one leg (cylinder) 10 facing each side of the disk 2 and the other leg 11 connected by a bridge section 12 that straddles the outer circumference of the disk 2. 1
A piston 13 is slidably provided within the housing. Further, the caliper 9 is provided with mounting portions 14 and 15 spaced apart in the rotational direction of the disk 2, and guide holes 16 and 17 extending in the axial direction of the disk 2 are formed in these mounting portions 14 and 15, respectively. .

The guide pins 7 and 8 have flanges 18 and 19, respectively.
are formed, and one ends of boots 20 and 21 are fitted into these flanges 18 and 19, respectively. The other end of the boot 20 is fixedly attached to the attachment portion 14 of the caliper 9. The other end of the boot 21 is formed into a bag shape and is tightly fitted into the mounting portion 15 of the caliper 9.

Further, a cup-shaped boot protector 22 that surrounds the boot 20 is interposed between the arm 3 of the carrier 1 and the flange 18 of the guide pin 7, and this boot protector 22 is slidably inserted into the guide hole 16. The inserted guide pin 7 is press-fitted into the arm 3 of the carrier 1, so that it is clamped and attached between the arm 3 and the flange 18.

A cup-shaped boot protector 23 that surrounds the boot 21 is interposed between the arm 4 of the carrier 1 and the flange 19 of the guide pin 8. The freely inserted guide pin 8 is inserted into the arm 4 of the carrier 1.
The arm 4 is clamped and attached to the flange 19 by being press-fitted into the arm 4 and the flange 19.

Piston 13 in one leg 10 of caliper 9
An inner pad 24 is disposed between the pad guide portions 5 and 6 of the carrier 1 and is disposed between the pad guide portions 5 and 6 of the carrier 1. The other leg 1 of the caliper 9
1 and the disk 2, an outer pad 25 is disposed so as to be slidably fitted onto the guide pins 7, 8.

Then, the inner pad 24 is moved to the disk 2 by the piston 13 in one leg (cylinder) 10.
By pressing the caliper 9 against one side and moving the caliper 9 by the reaction force at this time, the outer pad 2 is moved.
5 is brought into pressure contact with the other side of the disk 2, so that the disk 2 can be sandwiched between the inner pad 24 and the outer pad 25.

The boot protectors 22 and 23 each have an extension portion 26 extending a part of their bottom side toward the back side of the inner pad 24, that is, the side of the piston 13 in the pad guide space of the carrier 1.
It has 27. Therefore, even if the inner pad 24 is moved toward the piston 13 during assembly, transportation, or pad replacement of the disc brake, the inner pad 24 will not come into contact with the extensions 26, 27 of the boot protectors 22, 23. Since it cannot move any further toward the piston 13 side, the pad guide portion 5 of the carrier 1
It will never fall off from 6. The outer diameters of the boot protectors 22 and 23 are made large so that a part of their bottom sides are located on the back side of the inner pad 24 in the pad guide space of the carrier 1, that is, on the side of the piston 13. These portions are used as extension portions 26 and 27.
In addition, notches 28 and 29 are formed in each part of the boot protectors 22 and 23 so as not to interfere with the caliper 9.

In the embodiment described above, the outer diameters of the boot protectors 22 and 23 were increased to form part of the extension parts 26 and 27, but the present invention is not limited to this. Use small diameter boot protectors for boots 20 and 21.
A part of these boot protectors is placed eccentrically with respect to the rear side of the inner pad 24 (the piston 1) in the pad guide space of the carrier 1.
3 side) and connect this part to the extension part 2.
6 and 27, and a protruding part is provided on a part of the bottom side of the boot protector so that this protruding part is located on the back side of the inner pad 24 (on the piston 13 side) in the pad guide space of the carrier 1. The protruding portions of the levers may be provided as extension portions 26 and 27.

As explained above, according to this invention, a boot protector is provided around the boot extending between the guide hole formed in the carrier and the guide pin provided in the carrier, and a part of the boot protector is attached to the carrier. Of the padded guide space,
Since the inner pad is configured to extend toward the side of the piston, it is possible to prevent the inner pad from coming off and falling off from the pad guide part of the carrier during assembly, transportation, and pad replacement. Since the boot is protected by the boot protector from flying particles, it is possible to prevent the boot from being damaged and the main portion of the guide pin from becoming rusty or from sliding failure due to adhesion of dust.

[Brief explanation of drawings]

Fig. 1 is a rear view showing an embodiment of this invention, Fig. 2 is a plan view thereof, Fig. 3 is a sectional view taken along line - in Fig. 2, and Fig. 4 is taken along line - in Fig. 2. 5 is a cross-sectional plan view of the main part, and FIG. 6 is a longitudinal sectional view of the main part. 1...Carrier, 2...Disk, 3, 4...
Arm, 7, 8...Guide pin, 9...Caliper, 1
0... One leg (cylinder) 11... Other leg, 13... Piston, 16, 17... Guide hole, 20, 21... Boot, 22, 23... Boot protector, 24... Inner pad .

Claims (1)

[Scope of utility model registration request] An inner pad is guided between both arms of a carrier formed in a substantially U-shape, guide pins are provided on both arms, and a piston is housed in one of a pair of legs that straddle the outer periphery of the disk and face both sides of the disk. A guide hole extending in the axial direction of the disk is provided in the caliper, the guide pin is slidably fitted into the guide hole, and a boot is passed between the guide hole and the guide pin, and the carrier is attached to the carrier. In a disc brake that supports the caliper slidably in the axial direction of the disc, a boot protector is provided around the boot to protect the boot, and a part of the boot protector is inserted into the pad guide space of the carrier. , A disc brake characterized in that the inner pad extends to the side of the piston.