JP2527994Y2 - 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 having a structure in which an outer pad is supported on a claw portion of a caliper is known. In this type of disc brake, a caliper is slidably supported by a carrier at a position straddling the disc, and the caliper is provided with a piston for pressing an inner pad against the disc, and a pawl is provided at a position facing the piston. A part is formed. An outer pad is supported on the claw portion of the caliper by a retainer spring, and a shim is interposed between the outer pad and the claw portion. This shim is made by attaching plate-like rubber etc. to both sides of a flat plate made of stainless steel etc. By interposing this shim between the outer pad and the claw part, abnormal noise generated when the brake is actuated That is, the so-called brake squeal phenomenon can be reduced. Further, the retainer spring is a fixed portion having a central portion formed in a protruding shape, and the fixed portion is fixed between the claw portions of the caliper to the back metal of the outer pad via a shim by screwing or the like. Thereby, the shim is supported by the back pad of the outer pad, the retainer spring is fixed to the outer pad, the arm portion formed by both ends of the retainer spring locks each claw portion of the caliper, and the outer pad is supported by the claw portion. It has become.

[0003]

In the above-mentioned conventional disc brake, when the fixing portion of the retainer spring is screwed to the back pad of the outer pad via the shim, rubber on both sides of the shim is used. Since it is deformed, it is very difficult to keep the tightening torque of the screw on the back metal constant. For this reason, the fixed state of the retainer spring to the back pad of the outer pad becomes unstable, and the loosening of the screw occurs due to vibration or the like when the vehicle travels, and there is no possibility that the outer pad may fall off from the claw portion. Was something.

The present invention has been made in view of the above circumstances, and has as its object to provide a disc brake capable of reliably and accurately supporting an outer pad on a claw portion of a caliper.

[0005]

According to the disk brake of the present invention, there is provided a caliper straddling a disk, a piston for pressing one pad against the disk and a pawl in which the other pad is supported by an arm portion of a retainer spring via a shim. In the disc brake, a portion is provided in an opposed state via the disc, and a hole is formed in the shim, and a fixing portion formed in the retainer spring is inserted into the hole to insert the other portion. It is characterized in that it is fixed to a pad, and a locking piece is formed in the fixing portion to lock the edge of the hole of the shim with a slight gap.

[0006]

According to the disc brake of the present invention, by fixing the fixing portion of the retainer spring to the pad on the claw portion side, the edge of the hole portion of the shim is slightly reduced by the locking piece formed on this fixing portion. Locked with a gap, the shim is supported by the pad on the claw side. That is, since the fixing portion of the retainer spring is directly fixed to the pad on the claw portion side without pressing the shim, the fixing state of the fixing portion to the pad on the claw portion side can be extremely stabilized. Then, the claw portion of the caliper is locked by the arm portion of the retainer spring whose fixing portion is securely fixed to the claw portion side pad, and the claw portion side pad is securely supported by the claw portion.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of a disc brake according to the present invention will be described below with reference to FIGS. In FIG.
Is a disc brake. This disc brake 1
Is composed of a carrier 2 fixed to a part of the vehicle, and a caliper 6 slidably supported on the carrier 2 by bolts 3 and pins 4 at a position across a disk 5. The caliper 6 has a piston 8 slidably provided on a cylinder 7, and the piston 8 and the disk 5
And a claw portion 9 formed in an opposed state with the claw portion 9 interposed therebetween.
Further, both ends of an inner pad (one pad) 11 are slidably supported in grooves 2 a, 2 a formed at opposing positions of the carrier 2. The outer pad (the other pad) 13 is supported by the claw portion 9 and the retainer spring 12. The outer pad 13 has two protrusions 14a, 14a integrally formed on the back of the back metal 14 inserted into a space formed between the claws 9 of the caliper 6 in a fitted state. .

[0008] A shim 15 is interposed between the two claw portions 9 of the caliper 6 and the outer pad 13 to reduce a so-called brake squeal phenomenon that occurs when the brake is operated. This shim 15 is, for example, a thin plate made of stainless steel, or a rubber plate attached to both sides of this plate.
A hole 15a is formed in the center of the shim 15, and the hole 15a is inserted into the two protrusions 14a of the back metal 14 of the outer pad 13 so as to be positioned. In addition, in the hole 15a of the shim 15,
A fixing portion 16 of the retainer spring 12 is inserted between the projecting portions 14a, 14a, and the fixing portion 16 is fixed to a back metal 14 of the outer pad 13 by screws 17 with screws.

The retainer spring 12 is formed by pressing a leaf spring, and as shown in FIGS. 3 to 5, a central portion thereof serves as a fixing portion 16 which is fixed to the back metal 14 of the outer pad 13. It is formed in a protruding shape. Arms 18 are extended from the fixing portion 16 in the left-right direction.
a, 18a are formed. In addition, these arm parts 1
The end portions of the wear detecting pieces 19 and 19 are bent in the same direction as the direction in which the fixing portion 16 protrudes. Further, the wear detecting pieces 19 and 19 and the arm 1
Each of the portions between the first and second portions is bent outward in an arc shape. This retainer spring 12
A plurality of locking pieces 21 and 21
Steps 21 a, 21 a are formed on the locking pieces 21, 21 in the direction opposite to the direction in which the outer pad 13 is fixed to the back metal 14 from the fixing portion 16. In addition, a hole 22 through which the screw 17 can be inserted is formed at the center of the fixing portion 16.

When the fixing portion 16 of the retainer spring 12 is screwed to the back metal 14 of the outer pad 13, the locking pieces 21 and 21 formed on the fixing portion 16 engage the edges of the hole 15a of the shim 15, respectively. By stopping,
The shim 15 is supported by the back metal 14 of the outer pad 13.
Here, steps 21 a, 21 a are formed at the connecting portion between the fixing portion 16 of the retainer spring 12 and the locking pieces 21, 21, and the size of the gap between the locking pieces 21, 21 and the back metal 14 of the outer pad 13 is determined. The shim 15 is slightly larger than the thickness dimension of the shim 15, so that the shim 15 is supported by the back metal 14 of the outer pad 13 with a slight gap.

The opposing surfaces of the claws 9, that is, the torque receiving surfaces 9 a are formed on an arc surface (at least a concentric arc surface) having substantially the same curvature as the inner peripheral surface of the cylinder 7 of the caliper 6. 7 are arranged on the same axis.
On the other hand, the protrusions 14a, 1
4a are arranged at right and left intervals so as to be in contact with the torque receiving surface 9a of each claw portion 9 one by one, and arcuate surfaces 23, 23 contacting the torque receiving surface 9a are provided on the outer periphery thereof.
Are formed. According to the disk brake having the above structure, the piston 8 is projected toward the inner pad 11 by supplying the brake hydraulic fluid to the cylinder 7, and the inner pad 8 and the outer pad are respectively formed by the piston 8 and the claw portion 9. The disk 5 is clamped via the cable 13. As a result, a frictional force is generated between the inner pad 11 and the outer pad 13 and the disk 5, and the vehicle is braked by the frictional force.

Next, how to attach the outer pad 13 to the claw portion 9 of the caliper 6 will be described. First, outer pad 1
The shim 15 is attached to the back metal 14 such that both the projecting portions 14a of the back metal 14 are inserted into the holes 15a of the shim 15. The fixing portion 16 of the retainer spring 12 is inserted between the two projecting portions 14a, 14a.
5a, and in this state, as shown in FIG. 6, the screw 17 is inserted into the hole 22 of the fixing portion 16 and tightened into the screw hole 24 formed in the back metal 14 of the outer pad 13. It is directly screwed and fixed to the back metal 14. By doing so, the edge of the hole 15 a of the shim 15 is locked by the plurality of locking pieces 21, 21 formed in the fixing portion 16. Here, since the gap between the locking pieces 21 and 21 and the back metal 14 is slightly larger than the thickness of the shim 15, the locking pieces 21 and 21 slightly move the shim 15 to the back metal 14 of the outer pad 13. It will be locked and supported with a gap. Further, as described above, the fixing portion 16 is
When fixing the retainer spring 4, the upper end and the lower end of the fixing portion 16 abut against the edge of the hole 15a of the shim 15, so that the rotation of the retainer spring 12 by screwing can be restricted. Replace retainer spring 12 with backing 14
Can be reliably positioned.

The arms 18, 18 of the retainer spring 12 are deformed and spread in the direction away from the back metal 14, and the projections 14 a, 14 a of the back metal 14 are inserted between the claws 9 of the caliper 6. Spread arm 18,1
The claw 9 is inserted between the back metal 8 and the back metal 14. In this state, when the deformation of the arms 18 is released, the respective claws 9 are connected to the back metal 14 via the shim 15 and the arm 1.
The outer pad 13 is supported by the claw 9 by being sandwiched between the outer pad 13 and the outer pad 8. Also, the outer pad 13
Is attached to the caliper 6 and then the retainer spring 12
Is fixed, first, the back metal 1 of the outer pad 13 is fixed.
The shim 15 is mounted on the caliper 4 in the same manner as described above. Next, from the back side of the claw portion 9 of the caliper 6, the fixing portion 16 of the retainer spring 12 is
Is inserted into the hole 15a of the shim 15 between the claws 9 and between the protrusions 14a, 14a, and the fixing portion 16 is screwed to the back metal 14 in the same manner as described above.

As described above, according to the disc brake 1 of the above embodiment, the shim 15 can be very easily supported on the back metal 14 of the outer pad 13 by fixing the retainer spring 12 to the back metal 14 of the outer pad 13. . Further, when the fixing portion 16 of the retainer spring 12 is screwed to the back metal 14 of the outer pad 13, the gap between the locking pieces 21 and 21 and the back metal 14 is slightly larger than the thickness of the shim 15. The shim 15 supported by the locking pieces 21 and 21 is slightly movable. That is, since the locking pieces 21 and 21 lock the shim 15 with a slight gap without pressing the shim 15 against the outer pad 13, when the fixing portion 16 is fixed to the backing metal 14, the screw 17 is tightened. The torque can be extremely stabilized, and the state of fixing the retainer spring 12 to the back metal 14 can be made very good and stable. Thereby, the support of the caliper 6 to the claw portion 9 by the retainer spring 12 of the outer pad 13 can be ensured.

Further, since the shim 15 is supported in a slightly movable state, when the brake is operated, the shim 15 is moved.
Is slightly moved between the back metal 14 and the claw portion 9 in accordance with the movement of the claw portion 9, so that the effect of reducing the brake squeal phenomenon by the shim 15 can be improved. In the above embodiment, the fixing portion 16 of the retainer spring 12 is directly screwed to the back metal 14 of the outer pad 13.
As a fixing method of 6, for example, as shown in FIG. Even in this case, similarly to the above-described embodiment, the locking pieces 21 and 21 are used.
Is fixed to the shim 15 with a slight gap therebetween, so that the fastening force of the fixing portion 16 by caulking can be stabilized, and the back metal 1 of the fixing portion 16 of the retainer spring 12 can be stabilized.
4 can be extremely stabilized.

Incidentally, the retainer spring 1 of the above embodiment is used.
2 are formed with wear detecting pieces 19, 19, and when the outer pad 13 is worn, the wear detecting pieces 19, 1 are formed.
9 is configured to generate a sound by contacting the disk 5 to notify the wear of the outer pad 13. The retainer spring 12 has a wear detecting piece 19 formed on only one side, or is formed. Needless to say, there may be none. Further, the specific structure of the disc brake of the above embodiment is not limited to the embodiment.

[0017]

As described above, according to the disc brake of the present invention, the following effects can be obtained.
By fixing the fixing portion of the retainer spring to the pad on the claw portion side, the shim can be very easily supported on the pad on the claw portion side. Further, when the fixing portion of the retainer spring is fixed to the pad on the claw portion side, the dimension of the gap between the locking piece and the pad on the claw portion side is slightly larger than the thickness of the shim, that is, fixing of the retainer spring. By directly fixing the portion to the pad on the claw portion side, the locking piece supports and supports the shim with a slight gap without pressing the shim against the pad on the claw portion side. The fixing state of the retainer spring to the pad on the claw side can be made extremely good and stable without being affected by the shim. Thereby, the support of the caliper to the claw portion by the retainer spring of the pad on the claw portion side can be ensured. Also, since the shim is supported in a slightly movable state, when the brake is activated, the shim moves slightly between the pad on the claw side and the claw according to the movement of the claw. By being moved and arranged, the effect of reducing the brake squeal phenomenon due to the shim can be improved.

[Brief description of the drawings]

FIG. 1 is a plan view of a part of a disk brake illustrating a structure of a disk brake according to an embodiment of the present invention, which is viewed in a cross-sectional view;

FIG. 2 is a front view of the disc brake with a partial cross section illustrating the structure of the disc brake of the embodiment.

FIG. 3 is a perspective view illustrating a shape of a retainer spring.

FIG. 4 is a plan view illustrating a shape of a retainer spring.

FIG. 5 is a front view illustrating the shape of a retainer spring.

FIG. 6 is a cross-sectional view of a main part illustrating a state in which a retainer spring is fixed to an outer pad.

FIG. 7 is a cross-sectional view of a main part illustrating another state of fixing the retainer spring to the outer pad.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Disc brake 5 Disc 6 Caliper 8 Piston 9 Claw 11 Inner pad (one pad) 12 Retainer spring 13 Outer pad (other pad) 15 Shim 15a Hole 16 Fixed part 18 Arm part 21 Locking piece

Claims (1)

(57) [Scope of request for utility model registration] 1. A piston that presses one pad against the disk on a caliper straddling the disk and a claw portion where the other pad is supported by an arm portion of a retainer spring via a shim so as to face each other via the disk. In the disc brake provided, a hole is formed in the shim, and a fixing portion formed in the retainer spring is inserted into the hole and fixed to the other pad. A disc brake, characterized in that a locking piece for locking the edge of the hole of the shim with a slight gap is formed.