JPS6237530A - Brake disc friction pad and manufacture thereof - Google Patents

Abstract

PURPOSE:To reduce the residual stress after plastic deformation considerably by forming plural grooves in the welding face of lining pad then communicating with the slits formed in the disc sliding face. CONSTITUTION:In the friction pad 10, the lining pad 20 and the back plate 30 are integrated through welding to cut proper number of slits 22 in the disc sliding face 21 while plural grooves 24 communicating with the slits 22 are cut at the welding face 23 side of lining pad 20. Consequently, residual stress to be produced when manufacturing the friction pad can be reduced considerably.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a friction pad for a disc brake and a method for manufacturing the same.

[Conventional technology]

The friction pad of a disc brake is as shown in Figure 1.
The lining pad 1 and the back plate 2 are welded and integrated, and slits 4 facing inward from the disk sliding surface 3 of the lining pad are cut at an appropriate number of equal intervals to prevent warpage caused by residual stress and to drain water during control. is facilitated.

[Problem that the invention seeks to solve]

That is, in manufacturing this friction pad, as shown in FIG. The lining pad 1 and the back plate 2 are formed into a predetermined shape, and as shown in FIG. Since it curves toward the lining pad 1 side due to the difference in heat shrinkage, this is corrected and pressed to avoid plastic deformation, and the lining pad 1 is bent inward from the disk sliding surface 3 side as shown in FIG. 2 (C). Form an appropriate number of slits 4.

However, when cutting 4 into this sleeve 1, the back plate 2
A slit 4 is cut on the welding surface 5 of the lining pad 1, leaving about 0.5 to 11III11 on the welding surface 6 side of the lining pad 1 so as not to get attached.

Therefore, since the lining pad 1 is not divided, even if the slits 4 are formed, residual stress remains due to the difference in thermal contraction, and the pad may tend to return to the shape of the plastically deformed surface at room temperature during use.

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to provide a friction pad in which residual stress is significantly reduced after plastic deformation, and a method for manufacturing the same.

[Means for Solving the Problems] A first aspect of the present invention is a friction pad in which a lining pad is welded to a back plate, and the lining pad has an appropriate number of slits extending inward from the disk contact surface. A friction pad for a disc brake, characterized in that a suitable number of grooves are formed on the welded surface of the lining pad, and the grooves communicate with the slits, The second invention is l! in which the lining pad is welded to the back plate! Jl! I' of a disc brake that is an X pad and has an appropriate number of slits formed inward from the disc contacting surface of the lining pad! ! In the i-pad manufacturing method, after forming an appropriate number of grooves on the disc contact surface of the lining pad and welding the lining pad to the back plate, a sleeve 1 extending from the first contact surface of the lining pad to the grooves is formed. The present invention relates to a method for manufacturing a friction pad for a disc brake, characterized in that a friction pad is formed.

[For production]

With the above configuration, the slits are formed in the entire thickness direction of the lining pad of the friction pad, so that no difference in thermal shrinkage occurs and residual stress is significantly reduced.

〔Example〕

Embodiments of the friction pad of the present invention will be described below with reference to FIGS. 3 and 4.

The friction pad 10 is made by welding the lining pad 20 and the back plate 30 together, and cutting an appropriate number of slits 22 from the joint 21 of the disc 1.
An appropriate number of grooves 24 communicating with the slit 22 are cut on the welding surface 23 side of the slit 22.The groove 24 may be formed with the same width as the slit 22 or narrower than that, but If the slit 22 is formed wider than the slit 22, it becomes difficult for the frictional heat generated by braking to be transmitted to the lining pad 2o. Further, the groove 24 can be appropriately selected to have a triangular cross section as shown in FIG. 3, a semicircular cross section as shown in FIG. 4, etc.

Next II! An example of a method for manufacturing the gap pad 10 will be explained with reference to FIG. 5. As shown in FIG. - A plate-shaped back plate 30 is formed into a predetermined shape, and the lining pad 2o and the back plate 30 are welded and integrated at a temperature of about 1000''C, as shown in FIG.

Then, with the lining pad 20 curved toward the lining pad 20 side due to the difference in heat shrinkage, the slit 22 is cut from the disk 1 joint 21 side of the lining pad 20 to the groove 24. When the concave grooves 24 are communicated, some of the lining pads 20 are divided into several blocks, and the flatness is improved, and the residual stress is significantly reduced as shown in FIG.

In addition, even if the slit 22 is removed, it will not work! If it does not become 1, flatten it using a correction press or the like.

〔Effect of the invention〕

As described above, the present invention can be formed on a lining pad.
Since the sleeve 1 is provided from the contact surface of the disc 1 to the welding surface of the back plate, the residual stress that occurs during the manufacturing of the friction pad can be significantly reduced, making manufacturing easier, and the concave groove can be formed into the lining pad. Since the slit is cut after cutting on the welding surface side, there is no need to attach a backing plate.

[Brief explanation of the drawing]

FIG. 1 is a sectional view showing an example of a conventional SM pad, FIG. 2 is a sectional view showing a conventional friction pad manufacturing process, and FIGS. 3 and 4 are I'! JtE! 5 is a sectional view showing different embodiments of the pad, and FIG. 5 is a sectional view showing an embodiment of the manufacturing process of the present invention. 10... [111 Butt 20... Lining pad 21... Disk layer contact surface 22... Slit 23... Welding surface 24... Concave groove 5th Fig. 2 concave (C)

Claims (1)

[Scope of Claims] 1. A friction pad for a disc brake in which a lining pad is welded to a back plate, and an appropriate number of slits are formed inward from the disc sliding surface of the lining pad. A friction pad for a disc brake, characterized in that a suitable number of grooves are formed on the welded surface of the pad, and the grooves communicate with the slits. 2. In a friction pad manufacturing method for a disc brake, in which a lining pad is welded to a back plate, and an appropriate number of slits are formed inward from the disc sliding surface of the lining pad, the welded surface of the lining pad is A method for manufacturing a friction pad for a disc brake, comprising forming an appropriate number of grooves, welding the lining pad to a back plate, and then cutting a slit extending from the disc sliding surface of the lining pad to the grooves. .