JP2588952Y2 - Disc brakes for vehicles - 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 for a vehicle used for a vehicle such as an automobile or a motorcycle.
In particular, the present invention relates to a structure for preventing occurrence of a tapping sound due to rattling of a friction pad.

[0002]

2. Description of the Related Art A lug projecting from both sides of a back plate of a friction pad is engaged with a groove-shaped pad guide formed on a caliper support arm, and a friction pad is suspended from a side surface of a disk rotor. Disc brakes, for example,
There is one disclosed in Japanese Patent Application Laid-Open No. 3-24269.

This disc brake uses a retainer / pad spring in which a U-shaped pad retainer and two pad springs are integrally formed for holding a friction pad. The pad retainer is laid on a pad guide portion, and By applying one of the springs to the side surface of the lug in the disk circumferential direction and the other of the pad springs to the radially inner surface of the disk to elastically support the friction pad in the disk circumferential direction and radially outward. In addition, rattling of the friction pad is suppressed to prevent the friction pad from hitting during braking and running of the vehicle.

[0004]

However, in such a configuration, it is necessary to set a set load to the friction pad for each of the pad springs. This setting includes the strength and area of the pad spring material, the friction pad, and the like. Therefore, various factors such as a set load for the vehicle must be taken into consideration, and the setting is troublesome.

Further, the above-mentioned retainer and pad spring is required to fold a projecting piece having a length twice as long as the pad spring projects to the side of the pad retainer and the pad spring needs to have elasticity. However, the developed shape was peculiar, and the material picking was extremely bad. Furthermore, since the pad spring with a small area always receives the load from the friction pad, it is poor in durability and even if the pad retainer is not damaged, if the pad spring is flat,
The entire retainer and pad spring had to be replaced.

[0006] The present invention has been made in view of such circumstances, and its purpose is to eliminate the need to set the spring set load and the like, while suppressing the rattling of the friction pad with rattling. It is an object of the present invention to provide a vehicle disk brake that can slide a friction pad satisfactorily.

[0007]

SUMMARY OF THE INVENTION In accordance with the above-mentioned object, the present invention is directed to a pair of caliper support arms extending from the caliper bracket fixed to the vehicle body to the outside of the disk rotor in the disk axial direction. A groove-shaped pad guide portion facing each other is formed at the side portion, and lugs projecting from both sides of the back plate of the friction pad are locked to the pad guide portion, and a pair of friction pads are attached to both side portions of the disk rotor. In the vehicle disk brake disposed opposite to the
A spring accommodating space portion is formed in the lug of the back plate, the spring accommodating space portion being opened on the inner surface and the outer surface in the disk radial direction, and the side surface in the disk circumferential direction. A guide part, which is a part of a spring, is arranged so as to protrude from openings on the radially inner and outer surfaces of the lugs in the disk radial direction and the circumferential surface of the disk.

[0008]

When a load in the radial direction of the disc is applied to the friction pad due to a running vibration of the vehicle body or the like, the guide portion of the damper spring projecting from the side surface of the lug in the circumferential direction of the disc is elastically attached to the inner wall of the pad guide portion. Abut. Also, when the braking action is performed by this disc brake, the friction pad
Due to the sliding contact with the disk rotor, the disk is dragged in the disk ejecting direction, and the guide portion of the damper spring on the disk ejecting side first elastically contacts the inner wall of the pad guide portion, and then the braking torque is applied. The friction pad compresses the guide portion of the damper spring and pushes the guide portion into the spring accommodating space portion, moves in the disc ejecting direction, and gently contacts the inner wall of the pad guide portion.

Further, when a load is applied to the friction pad outward in the disk radial direction due to a running vibration of the vehicle body or the like, the guide portion of the damper spring protruding from the outer surface of the lug in the disk radial direction moves to the upper wall of the pad guide portion. When the friction pad is elastically contacted and descends from the state in which the friction pad has floated outward in the radial direction of the disc, the guide portion of the damper spring projecting from the inner surface of the lug in the radial direction of the disc elastically contacts the lower wall of the pad guide portion. Abuts to support the load on the friction pad.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to FIGS.

The disc brake 1 is provided with a caliper bracket 3 fixed to a vehicle body on one side of a disc rotor 2 which rotates in the direction of arrow A. The caliper bracket 3 separates the outside of the disc rotor 2 from the disc. A caliper body 4 is supported by a pair of caliper supporting arms 3a, 3a extending parallel to the axis via a pair of sliding pins 5 (one not shown) so as to be movable in the disk axial direction.

The caliper body 4 includes an operating portion 4a disposed on one side of the disk rotor 2, a reaction portion 4b disposed on the other side of the disk rotor 2, and a reaction portion 4b disposed on the outside of the disk rotor 2. The bridge part 4c is connected by straddling. The action portion 4a is provided with a cylinder hole 6 opening the disk rotor 2 side, and the reaction portion 4b is provided with a reaction force claw 4d. A cylindrical piston 7 having a bottom is accommodated in the cylinder hole 6 so as to be liquid-tight and movable, and the piston 7 is provided with a pressure supplied to a hydraulic chamber 8 defined at the bottom of the cylinder hole 6. The liquid moves the cylinder hole 6 toward the disk rotor.

A pair of friction pads 9, 9 are arranged between the piston 7 and the reaction force claw 4d so as to face each other with the disk rotor 2 interposed therebetween. The friction pad 9 is formed by joining a lining 10 slidably in contact with the disk rotor 2 to a metal back plate 11, and ear pieces 11 a, 11 a
And a shim plate 12 is mounted on the back surface of the back plate 11. The caliper supporting arms 3a, 3a are provided with pad guides 3b, 3b having a U-shaped cross section facing each other on respective sides of the disk rotor 2. Ear pieces 11
a and 11a are connected to the pad retainer 1 by the pad guide portion 3b.
3 is supported.

A spring accommodating space 11b is formed on the back side of each ear piece 11a, and the back side of the back plate of the damper spring 14 fitted in the space 11b is covered with the above-mentioned pad retainer 13 to be pulled out. I'm stopping. The spring accommodating space 11b has a vertical wall surface on the main body side of the back plate 11, cuts the inside of the upper and lower corners of the lug 11a into a tapered shape, and has a side surface 11c in the disk circumferential direction of the lug 11a.
An opening 11f is provided in each of the inner surface 11d and the outer surface 11e in the radial direction of the disk. When the spring accommodating space 11b is viewed from the back side of the ear piece 11a, three isosceles triangles are vertically arranged. The recess is shaped like a cut off top.

On the other hand, the damper spring 14 is formed by bending a band-shaped spring plate to form an isosceles triangle having the same shape as the spring accommodating space 11b. The damper spring 14 is fitted into the spring accommodating space 11b. When combined, the three apexes serving as the guide portions 14a are arranged to protrude from the side surface 11c in the disk circumferential direction and the respective openings 11f of the inner surface 11d and the outer surface 11e in the disk radial direction. Further, the bottom of the isosceles triangle of the damper spring 14 applied to the vertical wall surface of the spring accommodating space 11b has a shape in which only the both ends of the spring plate are folded and an intermediate portion is opened, and the guide portion 14a is formed. When an external force is applied, a part of the damper spring 14
1b so as to be easily bent.

The spring receiving space 11b of the ear piece 11a
The spring 14 mounted on the guide portion 14a projects from the opening 11f of the inner surface 11d in the disk radial direction.
Is provided on the lower wall of the pad guide portion 3b.
And retains the ear piece 11a in a state of being slightly raised from the lower piece of the pad retainer 13. Also,
The remaining guide portions 14a, 14a may be slightly separated from the pad retainer 13 as shown in the respective drawings, or may be slightly contacted with the pad retainer 13.

This embodiment is constructed as described above. When the friction pad 9 moves in the radial direction of the disk due to the vibration of the vehicle body or the like, the damper projecting from the side surface 11c of the lug 11a in the disk circumferential direction. The guide portion 14a of the spring 14 elastically contacts the rising piece of the pad retainer 13 covering the inner wall of the pad guide portion 3b to absorb the load of the friction pad 9.

Similarly, when the friction pad 9 moves outward in the disk radial direction due to running vibration of the vehicle body or the like, the guide portion 14a of the damper spring 14 projecting from the outer surface 11e of the lug 11a in the disk radial direction is moved to the pad guide portion 3b. Elastically comes into contact with the upper piece of the pad retainer 13 that covers the upper wall of the pad, and absorbs the load of the friction pad 9. Also friction pad 9
When this is lowered from the floating state, the guide portion 14a of the damper spring 14 protruding from the inner surface 11d of the lug 11a in the radial direction of the disk elastically moves to the lower piece of the pad retainer 13 covering the lower wall of the pad guide section 3b. In contact, the load of the friction pad 9 is supported.

When the braking action is performed by the disc brake 1, the friction pad 9 is slid in the disc ejecting direction by the sliding contact with the disc rotor 2, and the damper spring 14 on the disc ejecting side in the disc circumferential direction. Guide portion 14a first elastically contacts the rising piece of the pad retainer 13 covering the inner wall of the pad guide portion 3b,
Next, the friction pad 9 to which the braking torque has been applied moves in the disk unwinding direction while compressing the guide portion 14a and pushing it into the spring accommodating space 11b, and
The side surface 11c of the disk feeding side 1a gently contacts the rising piece of the pad retainer 13.

In this embodiment, the friction pad 9 is
When rattling occurs in the disk circumferential direction or disk radial direction due to running vibration of the vehicle body or the like, the guide portion 14a of the damper spring 14 protruding from the opening 11f of the lug 11a buffers the contact, so that the hitting noise is extremely small. Can be Further, at the time of braking, the guide portion 14a of the damper spring 14
The side surface 11c of the lug 11a in the circumferential direction of the disk comes into contact in two stages, and the guide portion 14a in the first stage has the pad retainer 13 as in the case of the backlash in the circumferential direction of the disk.
Short moving stroke until it comes into contact with the rising piece of
The elastic force acts to suppress the tapping sound, and the second stage ear piece 11
In (a), the guide portion 14a projecting from the side surface 11c in the circumferential direction of the disk is gradually deformed while being pushed into the spring accommodating space portion 11b, and the moving speed of the friction pad 9 is reduced. The contact of the friction pad 9 is extremely low.

Further, the damper spring 14 of the present embodiment
Need only be fitted in the spring accommodating space 11b of the ear piece 11a, and the setting of a set load and the like on the friction pad 9 required for the conventional pad spring is not required.
Furthermore, since the shape is simple, it is excellent in material picking. Further, since no extra load is applied from the friction pad 9, the durability is excellent, and the pad retainer 13
From the ground, and can be exchanged individually, which is economical.

5 to 7 show another embodiment of the present invention, in which a spring accommodating space 11g of the lug 11a has a side surface 11c in the disk circumferential direction and an inner surface 1 in the disk radial direction.
1d and the outer surface 11e, three ear pieces 11a respectively
Are formed in a groove shape in the thickness direction. On the other hand, the damper spring 15 has linear guide portions 15a, 15b,
15c, connecting portions 15d, 15d connecting them, and latch portions 15e, 15e at both ends are formed by bending a single linear spring material.

In the above-described damper spring 15, the guide portions 15a, 15b and 15c are respectively fitted into the spring accommodating space portions 11g, and the latch portions 15e and 15e at both ends.
Are hooked and attached to the front and back surfaces of the ear piece 11a.
Each guide part 15a, 15b, 15c is fitted with a resilient force so that at least a part thereof protrudes outward from the opening of the spring accommodating space part 11g.

Further, between the guide portions 15a, 15b, 15c and the bottom wall of the spring receiving space 11g, the guide portions 15a, 15b, 15c receive an external force and are pushed inside the spring receiving space 11g. In this case, the guide portions 15a, 15b, and 15c have gaps that can be accommodated flush with the side surface 11c of the lug 11a in the disk circumferential direction and the inner surface 11d and the outer surface 11e in the disk radial direction. The same effects as those of the above-described embodiment can be obtained.

The pad retainer used in the above embodiment may be omitted. Further, in the present invention, the guide portion of the damper spring may be protruded from the three locations of the back plate lugs in the circumferential direction of the disk and the inner and outer surfaces in the radial direction of the disk. The shape is not particularly limited to the embodiment.

[0026]

As described above, according to the present invention, the lugs projecting from the back plate of the friction pad are formed with the spring accommodating spaces which are opened on the inner and outer surfaces in the disk radial direction and the side surfaces in the disk circumferential direction. A damper spring is removably mounted in the spring accommodating space, and a guide portion, which is a part of the damper spring, is disposed so as to protrude from openings on the inner and outer surfaces of the lugs in the disk radial direction and the side surfaces in the disk circumferential direction. This prevents the sound of the friction pad from hitting during braking and non-braking.
It is not necessary to apply the spring load to the friction pad only by slowing down the moving speed of the friction pad during braking, so compared to conventional pad springs, detailed setting such as set load on the friction pad is not required, design and manufacturing , Assembly can be performed roughly.

Further, the damper spring is excellent in durability because it does not receive an excessive load from the friction pad, and has a shape such that a spring plate or a spring wire can be used as it is for the damping spring material. Is simple, so it is excellent in material picking.

Further, since any one of the three guide portions of the damper spring guides the movement of the friction pad instead of the ear piece of the friction pad, the sliding property and stability of the friction pad are improved, and the pad pressing is improved. It is less likely that the pressure is lost to the frictional resistance and the braking force is lost.

[Brief description of the drawings]

FIG. 1 is an enlarged front view of a main part of a disc brake showing an embodiment of the present invention.

FIG. 2 is a half sectional rear view of the disc brake showing one embodiment of the present invention;

FIG. 3 is a sectional view taken along the line III-III in FIG. 2;

FIG. 4 is a perspective view of a main part of the friction pad showing one embodiment of the present invention.

FIG. 5 is a sectional front view of a main part of a disc brake showing another embodiment of the present invention.

6 is a sectional view taken along line VI-VI of FIG.

FIG. 7 is a perspective view of a main part of a friction pad showing another embodiment of the present invention.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Disc brake 2 ... Disc rotor 3 ... Caliper bracket 3a ... Caliper support arm 3b ... Pad guide part 4 ... Caliper body 9 ... Friction pad 10 ... Lining 11 ... Back plate 11a ... Ear piece of back plate 11 11b ... Ear piece 11a 11c: inner surface of the lug 11a in the radial direction of the disk 11e: outer surface of the lug 11a in the radial direction of the disk 11f: guide portion 14a of the damper spring 14 12: Shim plate 13: Pad retainer 14: Damper spring 14a: Guide portion provided on damper spring 14 A: Rotation direction of disk rotor 2

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁶ , DB name) F16D 55/00-55/50 F16D 65/00-66/02

Claims (1)

(57) [Scope of request for utility model registration] 1. A pair of caliper support arms extending outwardly of a disk rotor in a disk axial direction from a caliper bracket fixed to a vehicle body and forming groove-shaped pad guide portions facing each other on respective side portions of the disk rotor. In the vehicle disk brake, a pair of friction pads are opposed to both side portions of the disk rotor by locking ear pieces projecting from both sides of the back plate of the friction pad to the pad guide portion. A spring receiving space is formed in the lugs of the disk so as to open on the inner and outer surfaces in the radial direction of the disk and the side surface in the circumferential direction of the disk. A damper spring is mounted on the spring receiving space so as to be reduced, and one of the damper springs is provided. Wherein the guide portion, which is a portion, is disposed so as to protrude from openings on the radially inner and outer surfaces of the ear piece in the disk radial direction and the disk circumferential side surface. Vehicle brakes.