JP2587718Y2 - Friction pads for vehicle disc brakes - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a friction pad used for disc brakes of various running vehicles such as automobiles and motorcycles, and more particularly to a structure for preventing a back plate from being deformed.

[0002]

2. Description of the Related Art A friction pad for a disk brake for a vehicle is disclosed in, for example, Japanese Patent Application Laid-Open No. 58-200825.

In this technique, a single metal plate material to be a back plate is bent to form a double plate structure in a thickness direction at least in a range of a lining fixing surface, so that a conventional single plate back plate can be formed. On the other hand, it is described that the influence of the braking heat such as the vapor lock can be prevented, and the generation of the vibration that causes the brake noise can be suppressed.

[0004]

However, when the two back plates are connected together as described above, the work formed by press molding tends to return to its original shape by its own elastic force. Because the coefficient of thermal expansion of each back plate is different due to heat conduction from, the joint part opens as a fulcrum in a C shape, or both back plates warp so that the lining and back plate are disk rotor and It may come into contact with the piston or reaction claw, causing unstable braking or uneven wear of the lining.

The present invention has been made in view of such circumstances, and an object of the present invention is to reduce the deformation of a back plate as much as possible and to achieve a friction of a vehicle disk brake capable of exhibiting a stable braking force. It is to provide a pad.

[0006]

SUMMARY OF THE INVENTION In accordance with the above-mentioned object, the present invention provides a friction pad for a vehicle disk brake comprising a lining and a double metal back plate, wherein the back plate has a two-piece structure.
It is characterized in that it is cut into pieces and the metal fibers of each piece are joined so that their flow directions are orthogonal to each other.

[0007]

When a metal plate used as a back plate of a friction pad is going to warp under the influence of heat, the heat warp follows a flow direction of a metal fiber, so-called fiber flow (hereinafter referred to as fiber flow). In the heat conduction from the lining side (one side), both back plates are likely to warp in the same direction. However, according to the above-described configuration in which the fiber flows are orthogonal, the two back plates are in the warp direction. The curvatures are different from each other, and cancel each other while interfering with each other at the joint surface.

[0008]

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

The friction pad 1 includes a lining 2 made of a sintered metal or a non-asbestos material, and two back plates 3 and 4 formed by press-forming a metal plate material such as a rolled steel plate. . On the joining side surface of the lining 2, two types of high and low cylindrical projections 2a and 2b are alternately formed by four each.
The lining 2 is provided at a point symmetrical position about the center O.

On the back plates 3, 4, suspending pieces 3b, 4b are provided at the center of one side edge of a similar main body 3a, 4a slightly larger than the lining 2.
Auxiliary projections 3c, 3 for torque transmission
c, 4c and 4c are extended. Hanging pieces 3b, 4b
Each of the friction pads 1 is provided with a hanger pin 5 inserted into the pin holes 3d and 4d, so that the friction pad 1 is moved from the caliper body 6 to the disk rotor 7 by the pin holes 3d and 4d.
Hanging on the side of the

For the above-mentioned back plates 3 and 4, a metal plate material having a thickness of about half of a conventional back plate formed of a single plate is used, and one of the back plates 3 to which the lining 2 is attached is used. Is formed in such a manner that the fiber flow of the plate material is formed in the direction of arrow A (the circumferential direction of rotation of the disk rotor 7), and is disposed on the piston 8 (reaction force claw when the caliper body is a floating type). The other back plate 4 is formed such that the fiber flow of the plate material is directed in the direction of arrow B (radial direction of the disk rotor 7) perpendicular to the one back plate 3.

On one back plate 3, a through hole 3e for binding is formed at the same position as the high protrusion 2a of the lining 2, and a boss portion 3f for positioning is formed at the same position as the low protrusion 2b of the lining 2. And the other back plate 4 has a back plate 3
At positions corresponding to the through holes 3e and the boss portions 3f, through holes 4e and 4f for binding and positioning are provided, respectively. The boss 3f of the back plate 3 is drawn by half piercing from the surface side on which the lining 2 is mounted, and the inside of the boss 3f is a bottomed hole 3g having the same shape as the low protrusion 2b of the lining 2. ing.

[0013] Through holes 3e, 4e, 4f of the back plates 3, 4;
The boss portion 3f of one back plate 3 is developed symmetrically with respect to the center O of the main body portions 3a and 4a, and the through holes 3e,
By following the dimensions of 4e, 4f and the boss 3f from the central portion O of the main bodies 3a, 4a, the accuracy is improved, and at the same time, the through-holes 3e, 4e, 4f and the boss 3f are applied to the plate at the time of molding. The flatness of the back plates 3 and 4 can be ensured by applying a press load to the center portion O of the main body portions 3a and 4a.

The back plates 3 and 4 are fitted with the boss 3f and the through hole 4f so as to be aligned without displacement, and are joined by welding the joining surfaces by joining means such as projection welding. Next, from the front side of the back plate 3, the high protrusions 2a of the lining 2 are fitted into the through holes 3e, 4e of the back plates 3, 4, and the low protrusions 2b are fitted into the bottomed holes 3g of the back plate 3, respectively. The lining 2 and both back plates 3 and 4 are pressure-bonded. An adhesive may be applied to the joint surface between the lining 2 and the back plate 3.

In the friction pad 1 thus constructed, the lining 2 is disposed on the disk rotor 7 side, and the back plate 4 is disposed on the piston 8 or the reaction force pawl side by suspension with the hanger pin 5. And when braking, lining 2
When the disk rotor 7 comes into sliding contact with the disk rotor 7, high-temperature braking heat
It is sequentially transmitted from the lining 2 to the back plate 3 → 4,
In this embodiment, the back plates 3 and 4 generate thermal warpage. In this embodiment, the back plates 3 and 4 are divided so that the fiber flows are orthogonal to the directions of the arrows A and B, so that the directions of both warp and the warp can be reduced. The curvatures are different, and the warpage of the two at the joining surface interferes with each other and cancels each other out, so that the deformation of the back plates 3 and 4 is extremely small.

The back plate 3 on the lining 2 side and the back plate 4 on the side of the piston 8 (or reaction claw) of the caliper body 6 have different thermal deformations. While the C-shaped deformation disappears, the shape of the thermal warpage due to the difference in the coefficient of thermal expansion differs, and this difference in deformation acts as a synergistic effect on the difference in the warping direction and the curvature due to the metal fiber. Deformation is further suppressed.

Further, in this embodiment, the high projections 2a of the lining 2 are fitted into the through holes 3e, 4e of the back plates 3, 4, and the low projections 2b are fitted into the bottomed holes 3g of the back plate 3. As a result, these fittings serve as an effect of suppressing deformation of the back plates 3 and 4 while increasing the binding force of the lining 2.

FIG. 5 shows a second embodiment of the present invention showing a modification of the first embodiment. In the lining 2, all the high projections 2a of the first embodiment become low projections 2b. Similarly, the first embodiment differs from the first embodiment in that all the through holes 3e are boss portions 3f, and other configurations such as the through holes 4e and 4f of the back plate 4 are the same as those of the first embodiment.

[0019]

[Effects of the Invention] The friction pad of the present invention is obtained by joining two metal back plates with their fiber flow directions orthogonal to each other, so that the warp direction and the curvature of both back plates due to the thermal effect are orthogonal. Then, since the two surfaces cancel each other while interfering with each other at the joint surface, the deformation of the back plate is suppressed to a very small value. In addition, since both back plates are separated, the U-shaped deformation due to springback is eliminated, and the lining and the back plate are less likely to hit the disk rotor, the piston, and the reaction force claw. The braking is stabilized, and uneven wear of the lining can be suppressed as much as possible.

Further, since the braking heat is transmitted from the lining side, the two back plates undergo different thermal deformations. This difference in deformation acts as a synergistic effect on the difference in the warping direction and the curvature caused by the metal fiber. Therefore, the back plate is more effectively prevented from being deformed.

[Brief description of the drawings]

FIG. 1 is an exploded perspective view of a friction pad showing a first embodiment of the present invention.

FIG. 2 is a rear view of the friction pad showing the first embodiment of the present invention.

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

FIG. 4 is a cross-sectional view in which the friction pad shown in FIGS. 1 to 3 is attached to a caliper body;

FIG. 5 is a sectional view of a friction pad showing a second embodiment of the present invention;

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Friction pad 2 ... Lining 2a ... High protrusion 2b ... Low protrusion 3 ... Back plate on the lining 2 side 3a ... Body part 3e ... Through hole 3f ... Boss part 3g ... Bottom hole 4 ... On the piston 8 and reaction force nail side Arranged back plate 5 ... Hanger pin 6 ... Caliper body 7 ... Disc rotor 8 ... Piston 4e, 4f ... Through hole A ... Flow direction of metal fiber of back plate 3 B ... Flow direction of metal fiber of back plate 4 O ... the lining 2 and the central portions of the main bodies 3a and 4a of the back plates 3 and 4

Claims (1)

(57) [Scope of request for utility model registration] 1. A friction pad for a vehicle disk brake comprising a lining and a double metal back plate, wherein the back plate is divided into two pieces, and the respective metal fibers are joined in a direction perpendicular to the flow direction. A friction pad for a disc brake for a vehicle.