JPS5817894B2 - Sprocket manufacturing method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method of manufacturing a sprocket.

Conventional sprockets are made of cast steel or forged products.

The former cast steel product has the drawbacks of requiring multiple molds and cutting work.

Furthermore, the latter forged product has the disadvantage that many dies are required for stamping from the primary processing to the final processing.

However, it had the disadvantage of being expensive in terms of cost.

This invention involves forming an annular body from rolled material, cutting the protrusions on the outer periphery of the annular body, dividing the annular body into a required number of pieces, and then cutting the divided parts into rib plates. The purpose is to provide something that is integrated with bolts on the periphery.

Embodiments of this invention will be described below with reference to the accompanying drawings.

In the figure, A is a rolled material, and this rolled material A includes a strip-shaped plate-like body 1, a protrusion 2 provided on a center line along the longitudinal direction of the surface of this plate-like body 10, and a plate-like body 1. The projecting plate 3 is provided on a line along the longitudinal direction of the back surface of the holder.

The rolled material A is subjected to r-bender or roll processing so that both ends meet and form a circle.

Next, both ends of the circularly bent rolled material A are joined by flash butt welding to obtain an annular body B as shown in FIG.

As shown in FIG. 4, the protrusions 2 of the ring-shaped body h obtained above are punched with a press, gas cut, or cut into @4, and the required circumferential spacing positions of the protrusion plates 3 are formed. A through hole 5 is provided through the both sides.

Thereafter, the annular body B is cut into the required number of pieces to obtain divided bodies A.
', but at this time, by taking into account that at least two through holes 5 remain in the protruding plate 3 of the bone splitting body A', and by cutting the teeth 4 at the valley part, the meshing chino will not cause any inconvenience.

Therefore, a disk 6 whose diameter is equal to the inner diameter of the plate-like body 1 of the annular body B is provided, and the divided body a is placed on the periphery of the disk 6 so that the end surfaces of the divided body a abut each other. The projecting plate 3 is arranged so as to circumscribe the side surface of the disc 6.

Next, the disc 6 is aligned with the through hole 5 and the through hole 5 of
A fastener 8 consisting of a bolt and a nut is inserted into a through hole 7 provided in the hole 7 and is tightened.

In addition, a cylindrical part 1 for metal is provided in advance at the center of the disc 6.
0 is set.

Although the protruding plate 3 is provided to circumscribe only one side surface of the disk 6, two protruding plates 3 may be provided so as to circumscribe both side surfaces of the disk 6.

As described above, according to the method for manufacturing a sprocket according to the present invention, a rolled material is bent into a circular shape so that the two abut each other, and both ends of the rolled material are fixed by welding to form an annular body. At the same time, after the abutting ends are fixed by welding, the protrusions of this annular body are machined with gears.

Next, this annular body is cut into the required number of parts, the divided parts are arranged around the periphery of the rib plate, and the fasteners are inserted into matching through holes provided in the protruding plate and the rib plate to fix them. By doing so,
You can get sprockets.

Therefore, unlike conventional cast steel or forged products, it can be manufactured extremely simply and easily.

In addition, if a tooth is damaged, it is only necessary to replace the divided part of that part.

BRIEF DESCRIPTION OF THE DRAWINGS - The drawings show an example of the implementation of the present invention, in which Figure 1 is a perspective view of a rolled material, Figure 2 is a side view of the same bent into a circle, and Figure 3 is a side view of the rolled material.
The figure is a partially cutaway front view of the same as above, Figure 4 is a side view with gear cutting, Figure 5 is an exploded perspective view showing how the divided body is installed, and Figure 6 is the sprocket obtained in the same way. FIG.

A...Rolled material, A'...Divided body, a.
...Divided body, B...Annular body, 1...
... Plate-shaped body, 2 ... Protrusion, 3 ... Protrusion plate, 4 ... Teeth, 5 ... Through hole, 6 ...
... Disc, 7 ... Through hole, 8 ... Fastener, 10 ... Cylindrical part.

Claims (1)

[Claims] 1. A rolled material having a protrusion on the center line along the longitudinal direction of the front surface and a protruding plate on the longitudinal direction of the back surface,
After bending into a circular shape, both ends of this rolled material are welded to form an annular body, and then the protrusions of this annular body are machined with gears, and fasteners are installed at required intervals on the protruding plate. After making an insertion hole, the annular body is divided into the required number of pieces, and the divided pieces are placed around the periphery of a circular rib plate having a cylindrical part for metal at the center, and a protruding plate is attached to the rib plate. A method for manufacturing a sprocket, characterized in that the sprocket is fixed using a hole that extends through the hole and a fastener that is inserted through the hole.