JPH0522879U - Disc brake pad - Google Patents

Abstract

(57) [Summary] [Structure] Abutting surface portions 18a, 18b for abutting the backing plates 15a, 15b of the disc brake pads 6a, 6b to the pressing portions 9, 10 provided in the disc brake main body 1.
And the concave surface portions 20a and 20b that are recessed from the corresponding contact surface portions 18a and 18b provided from the periphery of the corresponding contact surface portions 18a and 18b to the outer peripheral portion. [Effect] In press molding, if a closed area that does not reach the outer peripheral portion of the molding surface is made convex, the flatness of the convex tip surface can be improved. By forming the contact surface portions 18a and 18b, the flatness thereof can be improved, and it is possible to prevent deterioration of the brake feeling and dragging of the disc.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 This invention relates to a disc brake pad that is attached to an automobile or the like.

[0002]

[Prior Art]

 In general, the disc brake pad comes into contact with a back metal that is abutted against a pressing portion provided on the disc brake body and is pressed in the disc direction by the back metal, and is fixed to the disc-side surface of the back metal and comes into contact with the disc. Has a lining that generates frictional force, and its backing is manufactured by press molding.

[0003]

[Problems to be solved by the device]

 The back metal produced by press molding may affect the flatness of the pad if the pad area is increased or the thickness of the back metal is reduced, especially on the side that contacts the pressing part of the disc brake body. If the flatness of the surface is not achieved, the braking feeling may be reduced and the disc may be dragged.

Therefore, an object of the present invention is to provide a disc brake which has a back metal having a good flatness on the side of the disc brake main body which comes into contact with the pressing portion, and which does not cause deterioration of brake feeling and dragging of the disc. Is to provide a pad for.

[0005]

[Means for Solving the Problems]

 In order to achieve the above object, a disc brake pad of the present invention comprises a back metal formed by press molding, which comes into contact with a pressing portion provided on the disc brake body and is pressed in the disk direction by the pressing metal, and the back metal. Has a lining fixed to the disk-side surface thereof to generate frictional force by coming into contact with the disk, wherein the backing metal has a contact surface portion that abuts the pressing portion and a periphery of the contact surface portion. It is characterized in that it has a concave surface portion that is recessed from the corresponding contact surface portion up to the outer peripheral portion.

[0006]

[Action]

 According to the disc brake pad of the present invention, when press molding makes a convex shape in a closed area that does not reach the outer peripheral portion in the molding surface, the flatness of the convex tip surface is improved. In order to enable this, a concave surface portion that is recessed from the contact surface portion of the back metal that contacts the pressing portion of the disc brake main body from the periphery to the outer peripheral portion is provided, that is, the contact surface portion that requires flatness. By constructing the convex tip surface, it is possible to improve the flatness of the contact surface portion.

[0007]

【Example】

 A disc brake pad according to an embodiment of the present invention (hereinafter referred to as a pad) will be described below with reference to FIGS.

First, the overall structure of the disc brake provided with the pad of this embodiment will be described with reference to FIG. In the figure, reference numeral 1 is a disc brake main body. The disc brake main body 1 includes a carrier 2 fixed to a non-rotating portion of a vehicle, and a caliper 3 slidably provided on the carrier 2 at a position straddling the carrier 2 by a slide guide portion 2a. It is mainly composed of and.

A pair of pad guides 4 are provided on the carrier 2 so as to face each other, and a pair of pads 6 a and 6 b are sandwiched by the pad guides 4 to extend along the axis of the disc 5. Both ends are supported so that it can slide in any direction.

The caliper 3 has a bridge portion 7 located on the outer peripheral side of the disk 5, a cylinder 8 provided on one side of the bridge portion 7 facing the one side surface of the disk 5, and the bridge portion 7 therebetween. And a claw portion (pressing portion) 9 provided on the other side and facing the other side surface of the disk 5. Here, a cylindrical piston (pressing portion) 11 whose end face 10 on the disc 5 side is parallel to the disc 5 is slidably fitted in the cylinder 8, and the claw portion 9 and the bridge portion 7 are arranged. Is substantially parallel to the disk 5 and slightly extends in the direction of penetrating the front and back of the paper in FIG. 1 and then branches to a predetermined amount in the same direction.

Then, when the piston 11 in the cylinder 8 slides and projects due to the brake fluid pressure generated when the brake is depressed, the pads 6 a and 6 b are held by the piston 11 and the claw portion 9 via the disc 5, The linings 12a and 12b of both pads 6a and 6b are brought into contact with the disc 5, and a frictional force is generated between them to weaken the rotation of the tires and brake the vehicle.

Here, the pad 6 a arranged on the piston 11 side has a backing metal having both-end support portions 13 a provided on the carrier 2 via the pad guide 4 and a substrate portion 14 a provided between these support portions 13 a. 15a and the above-mentioned lining 12a which is fixed to the fixing surface 16a of the base plate portion 14a of the backing metal 15a on the disk 5 side and abuts against the disk 5 to generate a frictional force (see FIG. 2). The pad 6b arranged on the claw portion 9 side also has a structure having a back metal 15b having both-end supporting portions 13b and a substrate portion 14b, and a lining 12b fixed to a fixing surface 16b of the back metal 15b ( (See FIG. 3).

As shown in FIGS. 2 and 4, the backing metal 15a of the pad 6a arranged on the piston 11 side is a surface opposite to the lining fixing surface 16a, that is, a surface 17a facing the piston 11a. Is substantially quadrangular with one side arcuate and the other three sides linearly provided slightly larger than the portion (portion indicated by hatching in FIG. 2) A that abuts the end face 10 of the cylindrical piston 11. The contact surface portion 18a and the concave surface portion 20a provided from the entire circumference of the corresponding contact surface portion 18a to the outer peripheral portion 19a are recessed from the corresponding contact surface portion 18a by one step. Has been done. Therefore, in press molding, if the convex area within the closed area that does not reach the outer peripheral portion of the molding surface is made convex, the flatness of the convex tip surface can be improved. The flatness of the contact surface portion 18a can be improved (since the outer periphery of the contact surface portion 18a does not reach the outer peripheral portion of the backing metal 15a, the entire periphery of the contact surface portion 18a is pressed at the time of press molding. Can be used to guide you and improve the accuracy of flatness). As shown in FIG. 4, on the surface opposite to the contact surface portion 18a, that is, the fixed surface 16a, there is provided a concave portion 21a having a substantially same shape as the contact surface portion 18a at a position corresponding to the contact surface portion 18a. Since the lining 12a is press-molded at the same time as 18a and is fixed so as to enter the recess 21a, the shear strength between the backing metal 15a and the lining 12a is improved.

As shown in FIGS. 3 and 5, in the back metal 15b of the pad 6b arranged on the claw portion 9 side, the surface 17b on the side facing the claw portion 9 contacts the claw portion 9 ( A portion slightly larger than the portion B shown by hatching in FIG. 3) (however, the portion of the claw portion 9 on the bridge portion 7 side (the upper side in FIG. 3) is equal to the contact portion B), the claw portion 9 and a contact surface portion 18b having a shape similar to that of the contact surface portion 9b, and a concave surface portion 20b that is recessed one step from the contact surface portion 18b provided from the entire circumference of the contact surface portion 18b to the outer peripheral portion 19b. And is press molded into such a shape. Therefore, similar to the above, it is possible to improve the flatness of the abutting surface portion 18b formed by the convex tip surface (the entire circumference of the abutting surface portion 18b is designed with a press die during press molding). Therefore, the accuracy of flatness is improved). As described above, as shown in FIG. 5, the fixing surface 16b is formed with a recess 21b having a shape substantially the same as the contact surface portion 18b at the same position as that of the contact surface portion 18b by press molding at the same time as the contact surface portion 18b. Since the lining 12b is fixed so as to enter the recess 21b, the shear strength between the backing metal 15b and the lining 12b is improved.

By improving the flatness of the abutting surface portions 18a and 18b of the pads 6a and 6b in this manner, it is possible to prevent the brake feeling from being lowered and the disk 5 from being dragged. Of course, since the flatness of only the necessary parts is secured, the manufacturing is easy and the manufacturing cost can be reduced. Furthermore, by adjusting the heights of the contact surface portions 18a and 18b, the backing plates 15a and 15b can be made lighter, and the inertance of the pad can be freely adjusted as a brake squeal countermeasure.

[0016]

[Effect of the device]

 As described above in detail, according to the disc brake pad of the present invention, when the press molding is made convex in a certain closed area that does not reach the outer peripheral portion of the molding surface, the flat surface of the convex tip surface is formed. In order to achieve good contact, the part of the back metal that requires flatness, that is, the contact surface part that contacts the pressing part of the disc brake main body is made up of a convex tip surface. The flatness of the surface portion can be improved. Therefore, it is possible to prevent the deterioration of the brake feeling and the drag of the disc, and it is possible to increase the pad area or reduce the thickness of the back metal.

[Brief description of drawings]

FIG. 1 is a plan view showing a disc brake in which a disc brake pad according to an embodiment of the present invention is used, with a cross section taken from the center to the upper side.

FIG. 2 is a perspective view showing a disc brake pad arranged on a piston side according to an embodiment of the present invention.

FIG. 3 is a perspective view showing a disc brake pad according to an embodiment of the present invention, which is disposed on the claw side.

4 is a cross-sectional arrow view taken along line XX in FIG.

5 is a cross-sectional arrow view taken along the line YY in FIG.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Disc brake main body 5 Discs 6a, 6b Pad 9 Claw portion (pressing portion) 11 Piston (pressing portion) 12a, 12b Lining 15a, 15b Back metal 18a, 18b Contact surface portion 19a, 19b Outer peripheral portion 20a, 20b Concave surface portion

Claims (1)

[Scope of utility model registration request] 1. A back metal formed by press molding, which comes into contact with a pressing portion provided on the disc brake main body and is pressed in the disc direction by the pressing portion, and is fixed to the disc-side surface of the back metal and comes into contact with the disc. In the pad for a disc brake having a lining for generating frictional force, the backing metal is provided so as to be recessed from the contact surface portion contacting the pressing portion and the contact surface portion from the periphery of the contact surface portion to the outer peripheral portion. A disc brake pad having a concave surface portion.