JPH1026156A - Shim for disk brake - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a shim having multiple functions by adding a function for preventing the shim from dropping out of a caliper claw to the shim. SOLUTION: A shim 30 disposed between an outer pad 20 and a caliper claw 18 is locked on the outer pad 20 by pad locking parts 36A-36C provided on the outer periphery of the shim 30, while caliper claw locking parts 38-38B are cut off from the pad locking parts 36B, 36C in the three sides thereof and formed into the approximately L-shaped configuration to pinch the caliper claw 18 between the rear surface side of the shim 30 and the locking parts 38A, 38B. Since the dimension between the outer edges of escapement holes 40 after the caliper claw locking parts 38A, 38B are cut upward are adapted to correspond to the dimension of a projection part 42, the shim 30 is located in the outer pad 20 so that the sound insulating property can be effectively displayed by mounting the shim 30. Thus, a spring for preventing the outer pad 20 from drop-out is not needed by adding the drop-out preventing function to the shim. The cost reduction can be effected, while the dragging of the outer pad is prevented and further the sound insulating property of the shim can be improved.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a shim interposed at a joint surface between the outer pad and the caliper claw in a disc brake in which an outer pad is attached to a caliper claw through an uneven fitting portion.

[0002]

2. Description of the Related Art Conventionally, as a disk brake, a disk brake having a structure in which an outer pad is unevenly fitted to a caliper claw and a braking torque generated on the outer pad is supported on a vehicle body via a caliper is known. .

For example, in a disc brake disclosed in Japanese Utility Model Laid-Open Publication No. 63-104736, a pair of convex protrusions for fitting unevenness is provided on the back side of the outer pad, while a pair of caliper claws are provided on the caliper claw side. Fitting holes corresponding to the convex protrusions of the outer pad are provided along the rotor axis direction. By fitting the two, an uneven fitting portion is formed, and the outer pad is locked to the caliper claw. In addition, at the time of the concave / convex fitting, a shim for noise reduction is inserted into the convex protrusion on the rear surface side of the outer pad to prevent the vibration from the outer pad from being transmitted to the caliper claw during braking.

In order to prevent the outer pad and the shim from dropping off from the caliper claw, a locking projection for locking a pad holding spring, which will be described later, is provided at an intermediate position of the projection on the back surface of the outer pad. ing. The pad pressing spring is formed by bending a single wire, and a clip portion for locking with the locking projection is provided at a central portion thereof, and both sides are protruded from the clip portion. A caliper claw engagement piece that extends toward the mold projection and engages with the caliper claw is provided.

[0005] The clip portion of the pad pressing spring formed as described above is attached to the locking projection on the back surface of the outer pad, and the pair of caliper claw locking pieces extended in the direction of the concave and convex fitting portion is locked to the caliper claw. By doing so, the outer pad is held by the caliper claw, and the outer pad and the shim can be prevented from falling off from the caliper claw.

[0006]

However, in order to prevent the shim interposed between the outer pad and the caliper claw from falling off, a spring for preventing the shim from falling off is required as described above. This causes an increase in the number of parts and an increase in manufacturing cost.

[0007] The shim is inserted into the convex protrusion on the back surface of the outer pad, but there is a gap between the convex protrusion and the inner diameter of the shim. Because of this gap, the shim moved within the gap during braking, and the soundproofing effect of the shim installation could not be maximized.

The present invention focuses on the above-mentioned conventional problems, and by adding a function of a fall-prevention spring to a shim, aims to reduce the cost by eliminating the fall-prevention spring, prevent the outer pad from dragging, and prevent the shim from slipping. To improve the soundproofing characteristics of the

[0009]

According to the present invention, if the function of a fall prevention spring is added to the disc brake shim interposed between the outer pad and the caliper claw, the fall prevention spring can be eliminated by multifunctionalization. This is based on knowledge. That is, a shim for a disc brake according to the present invention is a shim interposed in a joint surface portion between the outer pad and the caliper claw in a disc brake in which an outer pad is attached to a caliper claw through an uneven fitting portion. Is provided with a notch hole forming a relief for the concave-convex fitting portion, and a substantially L-shaped cut-and-raised piece cut and raised from the edge of the notch hole and enclosing the caliper claw edge portion is provided. .

The cut-and-raised piece has an elastic force so that the caliper claw can be pressed. The notch holes are formed so as to correspond to the pair of concave and convex fitting portions, and are formed so as to be fitable by adjusting the dimension between the outer edges of the notch holes to the dimension of the concave and convex fitting portion outer edges.

[0011]

According to the above construction, the area for avoiding the uneven fitting portion in the shim is cut and raised on the caliper claw side, and the uneven fitting portion is inserted into the notch hole generated by the cut and raised.
When the cut-and-raised piece is formed in a substantially L-shape and reaches the outer surface of the caliper claw, the caliper-claw is sandwiched between the cut-and-raised piece and the back side of the shim in the rotor axis direction. When the caliper claw is sandwiched between the cut-and-raised piece and the rear side of the shim, the movement of the shim in the axial direction of the rotor is restricted by the caliper claw, and the shim can be prevented from falling off from the caliper claw.

If the cut-and-raised piece is bent at a slightly acute angle and the caliper claw is pressed using the elastic force of the cut-and-raised piece, the shim is brought into close contact with the caliper claw. For this reason, the shim can more reliably prevent the shim from falling off the caliper claw.

Further, if the dimension between the outer edges of the notch holes is set in accordance with the dimension of the outer edge of the pair of concave / convex fitting portions, the outer pad and the shim are positioned, so that the shim and the pad can be integrated. For this reason, the shim does not move within the gap, and the soundproofing characteristics of the shim can be effectively exerted.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of a disc brake shim according to the present invention will be described below in detail with reference to the drawings.

FIG. 1 is a diagram showing a configuration when a disc brake shim according to an embodiment is applied to a disc brake.

In the disc brake used in this embodiment, a caliper 12 straddling a rotor (not shown) is movable with respect to a support mounted on the vehicle body along a shaft center direction of the rotor through a pair of guide pins. By operating the hydraulic cylinder provided on the inner side of the caliper, the inner pad is pressed against the rotor, and the outer caliper claw 18 on the outer side presses the outer pad 20 against the rotor by the movement of the caliper 12 due to the reaction force. ing. Here, the outer pad 20 includes a friction material 24 pressed against the rotor and a caliper claw 18 holding the friction material 24.
Back metal 28 for transmitting the pressing operation from the friction pad 24
It is composed of

A shim 30 is disposed between the caliper claw 18 and the outer pad 20 on the outer side of the disc brake.

FIG. 2 is a state diagram showing the form of the shim 30 before and after bending. FIG. 2A shows a state (semi-finished product) before bending, and FIG. Product). The shim 30 has a metal surface 32 on one surface and a low friction material surface 34 on the opposite surface. The shim 30 before bending is formed by pressing the original plate to form a backing metal 2.
8 is formed by punching along the outer peripheral shape.
Pad locking portions 36A, 36B, 36C serving as locking means for locking to the outer pad 20 are provided on the outer peripheral portion of the shim 30 which has been punched out before bending. And inside the shim 30 before the bending process,
Caliper claw locking portions 38A and 38B serving as cut-and-raised pieces are provided.

The pad locking portions 36A, 36B, 36C
It has a section shape extending outward from the outer periphery of the shim 30, and is mountain-folded at a slightly acute angle at a position of a line A indicated by a broken line in the figure.

On the other hand, the caliper claw locking portions 38A and 38B
From the vicinity of the central portion of the shim 30, it is in the form of a section extending in the longitudinal direction on both sides. The length of the caliper claw locking portions 38A and 38B is set to a length that is sufficient to cover the outer surface of the caliper claw 18 after bending the caliper claw locking portions 38A and 38B. Then, the caliper claw locking portions 38A and 38B correspond to a line C indicated by a broken line in the drawing inside the caliper claw locking portions 38A and 38B.
At a slightly acute angle at the position
A valley fold is made in the vertical direction with respect to the back surface of the shim 30 at the position of the line D indicated by the chain line. At this time, the distance between the line C and the line D is set to be slightly wider than the thickness of the caliper claw 18.

When the caliper claw locking portions 38A and 38B are bent, an escape hole 40 is formed on the surface of the shim 30 as a cutout hole (FIG. 2B). The distance between the outer edges of the clearance holes 40 corresponds to the dimensions of the later-described convex protrusions provided on the back surface of the back metal 28, and when these convex protrusions are inserted through the relief holes 40, the shim is reduced. Reference numeral 30 indicates the positioning with respect to the outer pad 20.

As shown in FIG. 2B, the form after bending the pad locking portions 36A, 36B, 36C and the caliper claw locking portions 38A, 38B is on the metal surface 32 side of the shim 30. The pad locking portions 36A, 36B, 36C protrude, and the caliper claw locking portions 38A, 38B protrude toward the low friction material surface 34 side of the shim 30.

A pair of convex protrusions 42 are provided on the back side of the back metal 28 so as to be fitted into and recessed from the caliper claw 18 and transmit braking torque to the caliper claw 18. Further, the outer periphery of the back metal 28 is cut out on the outer periphery of the back metal 28,
Notch portions 44A, 44B, 44C corresponding to the pad locking portions 36A, 36B, 36C of the shim 30 are provided. The outer pad 20 and the shim 30 thus configured
The low friction material surface 34 of the shim 30 is opposed to the back side of the back metal 28, and this facing state is maintained by the pad engaging portions 36A, 36B, 36C and the notch portion 44A. , 44B, 44C by the mutual locking action.

FIGS. 3A and 3B show the outer pad 20.
2 shows a locking configuration between the and the shim 30. FIG. 1A shows a cross-sectional state of the engagement between the pad engagement portion 36A and the notch portion 44A, and FIG. 2B shows the relationship between the pad engagement portions 36B and 36C and the notch portions 44B and 44C. The state of the stop section is shown. As shown in FIGS. 1A and 1B, the pad engaging portion 36A is bent slightly at an acute angle with respect to the back surface of the shim 30, so that the back metal 28 is biased obliquely to the notch portion 44A. They adhere. On the other hand, since the pad locking portions 36B and 36C have the same shape as the pad locking portion 36A,
The urging of the back metal 28 works, and the back metal 28 is brought into close contact with the notches 44B and 44C.

Then, as described above, the pad locking portions 36A,
Since 36B and 36C are biased obliquely to the back metal 28, even if a force for peeling the shim 30 acts in the thickness direction of the outer pad 20 as shown by an arrow 46, the back metal 2
8 and the shim 30 are separated from each other, and the outer pad 20 does not fall off the shim.

The caliper claw 18 is provided with a torque receiving hole 48 which is fitted into and recessed from the convex protrusion 42 provided on the back metal 28 and serves as a fitting hole for receiving a braking torque from the back metal 28. Then, the protrusions 42 of the outer pad 20 for positioning the shim 30 are fitted into the torque receiving hole 48 with the concave and convex to form the concave and convex fitting portion.
The outer pad 20 and the shim 30 are locked to the caliper claw 18 by using the caliper claw locking portions 38A and 38B provided at 0.

The caliper claw 18 and the outer pad 2
The locking structure with the shim 30 will be described with reference to FIG. FIG. 3C shows the caliper claw 18 and the outer pad 2.
0 is a lower side view showing a locked state with the shim 30. FIG.

As shown in FIG. 3C, the interval between the bending positions of the caliper claw locking portions 38A and 38B is set slightly wider than the thickness of the caliper claw 18, but the caliper claw locking portion 38A , 38B are set at a slightly acute angle, so that the shim 30
The contact is made in the direction of the arrow 50 which is the direction of the concave and convex fitting. Therefore, even if a force for peeling the shim 30 is exerted in the thickness direction of the caliper claw 18 indicated by the arrow 50, the caliper claw 18 and the shim 30 separate from each other, and the outer pad 20 and the shim 30 do not fall off from the caliper claw 18. Absent. Therefore, dragging to the rotor due to separation of the outer pad 20 can be prevented. In addition, caliper claw locking portions 38A, 3
Since 8B is provided inside the shim 30, the shim 30
Can be prevented from increasing. Therefore, reduction in the number of pieces taken from the original plate during press working can be suppressed, and a rise in cost can be prevented.

Further, since the distance between the outer edges of the relief hole 40 is equal to the outer dimension of the pair of convex protrusions 42, even if force is applied in the rotor rotation direction by brake braking, the relative distance between the outer pad 20 and the shim 30 is reduced. The position does not change. Therefore, the shim 30 does not move between the back metal 28 and the caliper claw 18, and the soundproof effect of the shim 30 works effectively.

[0030]

As described above, according to the present invention, there is provided a disc brake in which an outer pad is attached to a caliper claw via a concave-convex fitting portion by a shim interposed at a joint surface portion between the outer pad and the caliper claw. In addition, the shim is provided with a notch hole forming a relief for the concave-convex fitting portion, and a substantially L-shaped cut-and-raised piece cut and raised from the edge of the notch hole and enclosing the caliper claw edge. By providing the outer pad, the outer pad can be prevented from being dragged, and the function of the conventionally used outer pad falling prevention spring can be given to the shim, so that the falling prevention spring can be eliminated. The cost can be reduced by eliminating the fall-off prevention spring. Further, since the cut-and-raised pieces are formed inside the shim, the outer edge area of the shim does not increase, and an increase in cost can be suppressed when the shim is punched from the original plate.

Since the caliper claw can be pressed by using the cut-and-raised piece as an elastic piece, the caliper claw is pressed between the cut-and-raised piece and the back side of the shim, and the shim is brought into close contact with the caliper claw. For this reason, the shim can more reliably prevent the shim from falling off the caliper claw.

The notch hole is formed corresponding to the pair of concave and convex fitting portions, and the dimension between the outer edges of the notch hole is formed so as to be able to be fitted in accordance with the outer edge size of the concave and convex fitting portion. And the shim and the pad can be integrated. For this reason, the shim does not move within the gap, and the soundproofing characteristics of the shim can be effectively exerted.

[Brief description of the drawings]

FIG. 1 is a configuration diagram when a disc brake shim according to an embodiment is applied to a disc brake.

FIG. 2 is a diagram showing a state before and after bending of a shim.

FIG. 3 is an explanatory view showing a locking structure of a shim.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 12 Caliper 18 Caliper claw 20 Outer pad 24 Friction material 28 Back metal 30 Shim 32 Metal surface 34 Low friction material surface 36A Pad locking portion 36B Pad locking portion 36C Pad locking portion 38A Caliper claw locking portion 38B Caliper claw locking portion 40 Escape hole 42 Convex projection 44A Notch 44B Notch 44C Notch 46 Arrow 48 Torque receiving hole 50 Arrow

Claims (3)

[Claims] 1. A shim mounted on a joint surface portion between the outer pad and the caliper claw in a disc brake having an outer pad attached to a caliper claw via an uneven fitting portion, wherein the shim is fitted to the shim. A notch for forming a relief of the portion, and a substantially L-shaped cut-and-raised piece cut from the edge of the notch and enclosing the caliper claw edge. Sim. 2. The shim for a disc brake according to claim 1, wherein the cut-and-raised piece has an elastic force so as to be able to press a caliper claw. 3. The notch hole is formed so as to correspond to a pair of concave and convex fitting portions, and is formed so that the dimension between the outer edges of the notch holes can be fitted in accordance with the outer edge size of the concave and convex fitting portion. The shim for a disc brake according to claim 1.