JPH0255649B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a method for manufacturing a grooved brake disc for disc brakes used in motorcycles, four-wheeled vehicles, and the like.

(Prior Art) The friction portion of a brake disc requires wear resistance, and especially in motorcycles, since it is exposed to the outside, it requires good appearance in addition to wear resistance. An example of a material that satisfies these conditions is stainless steel, but since this type of material is expensive, when using it, the disk body a is made of mild steel as shown in Figure 8. A mounting hole b for connecting to the wheel was provided on the inner circumferential side, and friction plates c and c made of a wear-resistant material were fixed to both sides of the outer circumferential side by welding or brazing.

Then, in order to form radial grooves on the friction plate for dust discharge and draining, and to improve the yield of the friction plate material, small pieces of the friction plate were cut into equal parts of the ring. is welded or brazed to the disk body with a gap between the side end faces of the disk, and grooves are formed at this gap.
-3024, 59-85433, etc.

In addition, when manufacturing brake discs, radial grooves are formed on a ring-shaped friction plate by electric discharge machining (Japanese Patent Laid-Open No. 165924/1983) or by melting with a laser beam (Japanese Patent Laid-Open No. 165924). Showa 59-
113992) etc. are known.

(Problems to be Solved by the Invention) Various measures are taken to create grooves at intermediate positions on the surface of plates that are difficult to work with, such as stainless steel, using normal processing methods such as pressing and cutting. This is to avoid this difficulty since it is difficult to engrave.

However, among the above-mentioned conventional techniques, the method of fixing the small pieces of the friction plate to the disk body at intervals may cause squealing noise during braking unless the small pieces are firmly attached to the disk body with good flatness. However, there was a problem in that the installation work required a long time, and there was also the problem that the thickness of the disk increased because it had three layers. Furthermore, in the case where grooves are carved in the ring-shaped friction plate by means such as electrical discharge machining, the material inside and outside the ring becomes waste material, resulting in poor yield, and requires equipment such as electrical discharge machining. It wasn't efficient.

(Means for Solving the Problems) The present invention improves yield and facilitates groove formation by dividing a friction plate into small pieces, and also facilitates welding into a ring shape. A small grooved brake disk is obtained by punching out a friction plate from a wear-resistant metal plate, which has a concentric inner circumference and an outer circumference, and a side end surface extending from the inner circumference to the outer circumference. , a low step is formed along the side end surface of the friction plate to the outer periphery, the side end surfaces of the plurality of friction plates are butted together and welded in a ring shape, and a groove extending to the outer periphery is formed on the side surface by the step. It is characterized by the fact that it has been formed.

(Function) Since the present invention uses the above-mentioned means, it is possible to easily form a stepped portion on the side end face of each friction plate, and the side end faces of each friction plate are brought into contact and butted with a laser beam or an electron beam. When welded, a groove is formed by the step and a grooved brake disc is formed.

(Example) Next, an example of the present invention will be described with reference to the drawings. FIG. 1 shows four friction plates 1, each of which has a shape in which a ring is equally divided by inclined discharge lines, with a concentric outer periphery 2 and an inner periphery 3, from the inner periphery 3 to the outer periphery 2. Each friction plate 1 is punched out of a stainless steel plate using the same die.

Next, low step portions 7, 7, 8, 8 are formed on both sides of the side end surfaces 4, 5 near the outer periphery. This stepped portion is processed by applying pressure with a press machine to form the step, and cutting off the protruding portion. This step-up work can be performed relatively easily since the side end surfaces 4 and 5 are the ends of the plate and are easily plastically deformed.
It is also possible to perform the step formation by cutting means such as milling.

Next, each friction plate 1 is arranged in a ring shape as shown in FIG. 3, and the side end surfaces 4 and 5 are butted together, and when the abutting surfaces are irradiated with a laser beam or an electron beam, the part is heated as shown by the welding line 9. By welding in this manner, an integral brake disc 10 is formed, and at the same time a groove 11 is formed by the steps 7 and 8.

This disc 10 is connected either directly to the axle by means of a connecting hole 6 or to the wheel via a connecting ring.

Further, as shown in FIGS. 4 and 5, this disk 10 can have annular grooves 12, 12 carved on both sides to separate the friction pad sliding surface and the connecting portion.

Although the groove 11 is formed by the two step portions 7 and 8, it is also possible to provide only one of the step portions 7 and 8 with a wide width, omit the other step, and form only one step portion. You can also do it.

Next, the disk 20 shown in FIGS. 6 and 7 is
Side grooves 21 and 22 are provided alternately on the left and right sides,
Although the external shapes of the two types of friction plates 23 and 24 are the same, the stepped portion of the friction plate 23 is provided on the left side at the front in the rotational direction, and on the right side at the rear; It is located on the right side at the front and on the left side at the rear.

Similarly to the disk 10, this disk 20 is also punched out from a plate material, processed to have a step, and butt-welded as shown by the weld line 25. Each groove 2
1 and 22 can be formed by only a stepped portion of one of the friction plates, and in this case, a stepped portion having a width equal to the groove width is provided. Since welding is performed using a laser beam or an electron beam, the surface of the weld line 25 is smooth and easy to finish.

Friction plate 1 or 23, 2 of both disks 10, 20
4 have slanted side end surfaces, but may be fan-shaped with radial side end surfaces.

(Effects of the Invention) According to the present invention, since the stepped portion that becomes the groove is provided along the side end surface of the friction plate, the stepped portion can be easily formed. Since it is welded, there are few welding points and the welding length is short, and the yield of punching the friction plate is also good, so the disk can be manufactured at low cost. and,
The manufactured disc has a single-layer structure, so it is thin and helps make the brake smaller and lighter.

[Brief explanation of the drawing]

Figure 1 is a plan view of the four friction plates, Figure 2 is the top view of the 1st friction plate.
3 is a plan view of the brake disk, FIG. 4 is a plan view of the brake disc with an annular groove, and FIG. 5 is a sectional view taken along the line - in FIG. 4.
FIG. 6 is a plan view of a device in which grooves are provided alternately on the left and right sides, FIG. 7 is a cross-sectional view taken along the line -- in FIG. 6, and FIG. 8 is a cross-sectional view of a conventional example. 1, 23, 24...Friction plate, 4, 5... Side end surface,
7, 8...Step part, 11, 12, 22...Groove.

Claims (1)

[Claims] 1. A friction plate having concentric arc-shaped inner and outer circumferences and a side end face extending from the inner circumference to the outer circumference is punched out of a wear-resistant metal plate, and a low stepped portion is cut along the side end face of the friction plate to the outer circumference. A method for producing a grooved brake disk, characterized in that the side end surfaces of a plurality of friction plates are butted together and welded into a ring shape, and grooves extending to the outer periphery are formed on the side surfaces by the stepped portions.