JPH0244106Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Field of Application] The present invention relates to a friction pad for a disc brake that has a shim plate provided on the front side of the backing plate to prevent so-called brake squeal.

[Prior art]

Conventionally, in order to prevent brake squeal from occurring when the lining of the friction pad slides against the disc, a flat plate made of a thin metal plate whose entire surface or surface is coated with an elastic material such as rubber is used. By disposing an elastic material coating shim (hereinafter referred to as "shim") on the back side of the back metal, and by locally pressing the shim with high pressure from the periphery of the opening end on the pressing side of the piston pad and the legs of the caliper, In order to prevent the elastic material coating from peeling off or excessive wear on only a portion of the shim, it is known that a flat metal plate is provided on the back side of the shim.

In order to attach the shim and metal plate to the back metal plate, a plurality of elastic legs are formed on the shim and the metal plate to sandwich the upper and lower end surfaces of the back metal plate, and the shims and the metal plate are fixed to the back metal plate by the respective elastic legs. However, there is a method of positioning the disc in the rotational direction, or a method in which the shim and metal plate are configured to have almost the same shape as the width of the back metal in the disc rotation direction, and the shim and metal plate are integrated with the back metal into the torque receiving part formed on the mounting member (carrier) of the disc brake. A method of positioning in the rotational direction by bringing the material into contact with the material is used.

[Problem that the invention attempts to solve]

However, the former fixing method only involves holding the end surface of the back metal between the shims and the elastic legs provided on the metal plate. On the other hand, when the lining and the disk are frictionally engaged and the friction pad receives a force in the rotational direction of the disk, the friction pad is displaced relative to the piston and the leg of the caliper. As a result, the metal plate receives large sliding resistance from the piston and caliper legs, and as a result, the shim receives sliding resistance between the metal plate and the back metal, and the shim is coated. There is a problem in that the elastic material wears out or peels off, making it impossible to perform the brake squeal prevention function.

In addition, in the latter fixing method, the width of the shim and metal plate in the direction of disk rotation is formed to be almost the same as the back metal, and the shim and metal plate are brought into contact with the torque receiver of the disk brake, so positioning in the direction of rotation is ensured. Can be done. However, although the shims and metal plates originally only need to be present at the periphery of the opening end of the piston, the area that receives the pressing force from the claws of the legs of the caliper, etc., the shims and metal plates are The problem is that the same dimensions must be secured, which increases material costs. Further, since the shape of the shim and metal plate is large, there is a problem that it is difficult to achieve flatness in manufacturing.

The present invention was devised in view of the problems of the prior art, and involves forming positioning protrusions in the radial direction of the disk on the back metal plate, and engaging the shims and the elastic legs of the metal plate with these protrusions. It is an object of the present invention to provide a wear pad for a disc brake, which can reliably position the disc in the rotational direction and can reduce the widthwise dimensions of the shim and the metal plate.

[Means for solving problems]

In order to solve the above-mentioned problems, the feature of the configuration adopted by the present invention is that the flat plate has a plurality of elastic legs that are provided in contact with the back side of the backing metal and sandwich the upper and lower end surfaces of the backing metal. elastic material coating shim,
a flat metal plate having a plurality of elastic legs disposed so that the front surface side is in contact with the front surface side of the shim and sandwiching the upper and lower end surfaces of the back metal plate;
The protrusion is provided on at least one of the lower end surfaces in a radial direction of the disk, and is configured to position the shim and the elastic legs of the metal plate in the rotational direction of the disk.

〔Example〕

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

1 to 4 show a first embodiment of the present invention.

In the drawing, D is a disk that rotates together with the wheels, 1 is a mounting member attached to a non-rotating part of the vehicle body on one side of the disk D, 2 is a caliper slidably provided on the mounting member 1, and The caliper 2 is formed with an inner leg portion 2A and an outer leg portion 2B that extend across the disk D. Here, a cylinder 3 is formed in the inner leg portion 2A,
A piston 4 is slidably provided inside the piston.
It is activated by brake fluid pressure. On the other hand, the outer leg portion 2B has a forked melon portion.

In addition, wear pads 5, 5 are provided on both sides of the disk D on the inner and outer sides of the disk D. Each of these friction pads 5 has a backing metal 6
and a lining 7 provided on the front side of the back metal 6.
It is roughly composed of. As shown in FIG. 2, both upper ends of the back plate 6 extend in the rotational direction of the disc D to form protrusions 6A, 6A, which abut against the torque receiving part (pad guide part) of the mounting member 1 and receive torque during braking. It's getting old. On the other hand, a pair of protrusions 6B, 6B extending inward in the radial direction of the disk D are protruded from the lower end surface of the back plate 6 at a predetermined distance apart, and are adapted to position a shim 8 and a metal plate 9, which will be described later. Reference numeral 8 denotes a shim arranged so as to come into contact with the back side of the back metal 6 constituting each friction pad 5. As shown in FIG. A shim main body 8A having a substantially square shape as possible; an upper elastic leg 8B formed by bending a central protrusion on the upper end side of the shim main body 8A, and secured to the upper end surface of the back metal 6;
A pair of lower elastic legs 8C, which are formed by bending protrusions spaced apart by a predetermined dimension on the lower end side of the shim body 8A, are located on the lower end surface of the back metal 6 and are locked inside the protrusions 6B, 6B; It is composed of 8C. As shown in FIG. 4, the shim 8 is formed by cutting out a thin metal plate 8D coated with elastic materials 8E and 8F such as rubber or synthetic resin on both sides using a press or the like. As an elastic material coating shim, it can effectively prevent the occurrence of brake squeal noise.

Further, reference numeral 9 denotes a metal plate arranged so that the front side is in contact with the back side of the shim 8, and the metal plate 9 functions as a shim cover for the shim 8, and therefore has a width slightly larger than that of the shim body 8A. The formed metal plate main body 9A and the upper elastic legs 9 are formed by bending the protrusions at both upper end corners of the metal plate main body 9A and are latched to the upper end surface of the back metal plate 6.
B, 9B, and lower elastic legs formed by bending protrusions at both lower end corners of the metal plate main body 9A, and located on the lower end surface of the back metal plate 6 and latched to the outside of the protrusions 6B, 6B. It is composed of 9C and 9C.

The wear pad 5 according to this embodiment is constructed as described above, but in order to attach the shim 8 to the back metal 6, the upper elastic leg part 8B is hooked on the upper end surface of the shim 8, and the inner side between the protrusions 6B and 6B is attached to the lower end surface of the shim 8. , and hook the lower elastic legs 8C, 8C to hold the back metal 6 between them. On the other hand, in order to attach the metal plate 9 to the back metal plate 6, the upper elastic legs 9B, 9B are hooked on the upper end surface of the metal plate 9, and the lower elastic legs 9B are attached to the lower end surface of the metal plate 9, located outside between the protrusions 6B, 6B. 9C and 9C, and hold the back metal 6 between them. Thus, with the shim 8 and metal plate 9 attached, the friction pad 5 shown in FIG. 3 is assembled.

The friction pad 5 assembled in this way is attached to the disc brake in the state shown in Fig. 1, and comes into contact with both sides of the disc D when the brake is operated.
A braking action is applied to the disc D. On the other hand, Sim 8
This prevents brake squeal, and the metal plate 9 receives the pressing force of the piston 4 and outer leg portion 2B, thereby preventing damage to the shim 8.

However, during the braking operation, as the disc D rotates, the back metal 6 is displaced in the direction of rotation of the disc D.
On the other hand, since the back side of the metal plate 9 is pressed by the piston 4 or the outer leg portion 2B, the shim 8 tends to be relatively slidably displaced between the back metal plate 6 and the metal plate 9. However, in this embodiment, the lower elastic legs 8C, 8C of the shim plate 8 are connected to the protrusions 6B, 6 of the back plate 6.
The lower elastic legs 9C, 9C of the metal plate 9 are also locked on the outside between the protrusions 6B, 6B, thereby positioning the disk D in the rotational direction. As a result, the back metal 6, the shim 8, and the metal plate 9 are not displaced relative to each other, and it is possible to prevent the elastic materials 8E and 8F attached to the shim 8 from peeling off or being locally worn. Moreover, the shim 8 and the metal plate 9 are the protrusions 6B and 6B of the back plate 6.
The shim body 8A,
The width dimension of the metal plate main body 9A can be made as small as possible to the required dimension, reducing material costs, and since the width dimension may be small, flatness can be easily maintained.

Next, FIGS. 5 and 6 show a second embodiment of the present invention. The back metal and shims constituting the friction pad of this embodiment have the same shapes as those of the first embodiment, so they are designated by the same reference numerals as in FIG. 1, and their explanation will be omitted.

However, the metal plate 19 used in this embodiment includes a metal plate main body 19A, upper elastic legs 19B, 19B formed by bending protrusions at both corners of the upper end surface of the metal plate main body 19A, and a metal plate main body 19A. A lower elastic member is formed by bending protrusions spaced apart by a predetermined distance on the lower end surface of 19A, and is located on the lower end surface of the back metal 6 and is locked inside between the lower elastic leg portions 8C, 8C of the shim 8. It consists of leg parts 19C, 19C.

The wear pad 15 according to this embodiment is constructed as shown in FIG. Protrusions 6B, 6B of back metal 6
There is no difference from the first embodiment except that the second embodiment is indirectly locked to the second embodiment.

Furthermore, FIGS. 7 and 8 show a third embodiment of the present invention.

That is, the back metal 26 of this embodiment has protruding parts 26A, 26A at both ends of the upper part that abut against the torque receiving part of the mounting member.
A single protrusion 26B extending radially inward of the disk D is provided at the center of its lower end surface. In addition, the shim 28 is the shim body 28
A, an upper elastic leg 28B formed at the center of the upper end of the shim body 28A, and an upper elastic leg 28B formed at a predetermined distance apart from the lower end of the shim body 28A, and are engaged so as to narrow both sides of the protrusion 26B of the back metal 26. It is composed of a pair of lower elastic legs 28C, 28C. Further, the metal plate 29 includes a metal plate main body 29A, upper elastic legs 29B, 29B formed at both upper end corners of the metal plate 29A, and protrusions spaced apart by a predetermined distance from the lower end surface of the metal plate main body 29A. The shim 28 is formed by bending and is located on the lower end surface of the back metal 26.
The lower elastic leg portions 29C, 29C are secured to the outside of the lower elastic leg portions 28C, 28C.

The wear pad 25 according to this embodiment is constructed as shown in FIG. 8 in its assembled state, but the shim plate 28
The lower elastic legs 28C, 28C of the shim plate 28 are engaged with the protrusions 26B of the metal plate 26, and the lower elastic legs 29C, 29C of the metal plate 29 are connected via the lower elastic legs 28C, 28C of the shim plate 28. It can be indirectly engaged with the protrusion 26B, and its effect is the same as that of the first embodiment.

In each of the embodiments of the present invention, it has been described that the back plate is provided with a positioning protrusion located on the lower end side thereof, but the protrusion may be provided on the upper end surface side.

[Effect of idea]

The friction pad for a disc brake according to the present invention is as described in detail above, and has a structure in which the shim and the metal plate are positioned in the rotational direction of the disc via the protrusion provided on the backing plate, so that the shim and the metal plate are On the other hand, the shim does not undergo relative displacement, and the elastic material coated on the thin metal plate can be prevented from peeling off, allowing the brake squeal prevention function to be maintained over a long period of time. In addition, since the shim and the metal plate are directly positioned by the back metal, the widthwise dimensions of the shim and the metal plate can be limited to the required dimensions, reducing material costs. Since the dimensions are small, flatness can be easily achieved during manufacturing, and manufacturing efficiency can be improved.

[Brief explanation of the drawing]

1 to 4 relate to a first embodiment of the present invention, in which FIG. 1 is a longitudinal sectional view of a disc brake with a friction pad of the embodiment attached, FIG. 2 is an exploded perspective view of the friction pad, and FIG. Figure 3 is a perspective view showing the assembled state;
Figure 4 is a sectional view showing the material of the shim, Figures 5 and 6.
The figures relate to the second embodiment, FIG. 5 is an exploded perspective view of the friction pad according to the present embodiment, FIG. 6 is a perspective view showing the assembled state, and FIGS. 7 and 8 are the third embodiment. 7 is an exploded perspective view of the friction pad according to this embodiment, and FIG. 8 is a perspective view showing the assembled state. 6, 26... Back metal, 6B, 26B... Protrusion, 7
...Lining, 8,28...Shim, 8B,28
B...Upper elastic leg, 8C, 28C...Lower elastic leg, 9, 19, 29...Metal plate, 9B, 19
B, 29B...Upper elastic leg, 9C, 19C, 2
9C...lower elastic leg, D...disc.

Claims (1)

[Scope of utility model registration request] A friction pad for a disc brake that applies a braking action to the disc by pressing a lining provided on the front side of the back metal against the disc,
a plate-shaped elastic material coating shim provided in contact with the back side of the backing metal and having a plurality of elastic legs that clamps the upper and lower end surfaces of the backing metal; a flat metal plate having a plurality of elastic legs disposed and holding the upper and lower end surfaces of the backing metal; A friction pad for a disc brake, comprising the shim and a protrusion for positioning the elastic leg of the metal plate in the rotational direction of the disc.