JPS58141822A - Manufacture of w-pulley - Google Patents

Abstract

PURPOSE:To manufacture a light, highly accurate pulley inexpensively and at high yield by press working a metallic cylindrical body, and after forming a bead part that bulges outward in the middle of the cylindrical body and tapered parts on both ends of the body, opening the bead part to V-shape. CONSTITUTION:A cylindrical body 1 of small axial length which is obtained by bending roundly and joining an iron sheet and cutting it to a prescribed dimension is pressed by upper and lower dies, and a bead part 1a that bulges outward is formed in the middle of axial direction of the cylindrical body 1. Next, tapered parts 1b are formed by another die on both ends in axial direction of the cylindrical body 1 to obtain a semi-finished product 1'. The tapered parts 1b of the semi-finished product 1' is expanded and formed by a forming device to obtain a semi-finished product 1''. The semi-finished product 1'' is set to a finishing forming device and the bead part 1a is opened to V-shape in sectional form and an element 1''' of W-pulley is obtained. The element 1''' is fitted and fixed to the outer periphery of a rotor manufactured separately.

Description

[Detailed description of the invention] The present invention relates to a method for manufacturing a W pulley.

For example, in a car cooler, an electromagnetic clutch equipped with a double pulley is sometimes used to turn on and off power transmission between the car engine and the refrigerant compressor. Conventional electromagnetic clutch pulleys are generally made by cutting after forging. However, pulleys made by such a method have the disadvantages of being heavy and having a poor material yield.

Therefore, an object of the present invention is to provide a method for manufacturing a W pulley that eliminates the above-mentioned drawbacks.

A method for manufacturing a W pulley according to the present invention involves preparing a metal cylindrical body having a short axial length.

Forming an outwardly bulging ring-shaped peal portion in the axially intermediate portion of the cylindrical body; Forming a tapered portion by expanding both ends of the cylindrical body in the axial direction; and further pressing the tapered portion. It includes widening and shaping, and opening the pead into a V-shaped cross section. The thin W pulley element thus obtained is further manufactured as a separate body and fitted and fixed to the outer periphery of the nine rotors.

According to the present invention, the weight and cost of the W pulley can be reduced, and the amount of unbalance can be reduced.
Moreover, the material yield is also good.

Examples will be described below with reference to the drawings.

First, as shown in FIG. 1(a), a ring-shaped pipe or cylindrical body 1 having a short axial length is prepared by rolling and joining iron plates and cutting them into a fixed size. This cylindrical body 1 is shown in Figure 2 (,)
As shown in FIG. 2, the first dies 2 and 3 are positioned between the vertically paired first dies 2 and 3 so that their axes substantially coincide with each other. Next, as shown in FIG. 2(b), for example, the upper die 2 is lowered.

In this way, a ring-shaped bead portion 1a bulging outward as shown in FIG. 1(b) is formed at the axially intermediate portion of the cylindrical body 1.

Next, the cylindrical body 1 having this bead portion 1a is shown in FIG. 3(a).
As shown in FIG. 2, the second dies 4 and 5 are positioned between the vertically paired second dies 4 and 5 so that their axes substantially coincide with each other. Then, for example, by lowering the upper die 4, second dies 4 and 5 are press-fitted into both axial ends of the cylindrical body 1, respectively, as shown in FIG. 3(b). As a result, 9 cylindrical bodies 1 are shown in Fig. 1 (c
), tapered portions 1b are formed at both ends in the axial direction to form a semi-finished product 1'.

Next, this semi-finished product 1' is set in the shaping device 6 as shown in FIG. 4(,). The shaping device 6 includes an outer die corresponding to the outer side of the semi-finished product 1', and an upper and lower pair of inner dies 8, 9. The outer diameter is a ring-shaped thing divided into a plurality of pieces in the circumferential direction, and is arranged on the cushion plate 11, and when it descends while compressing the cushion 12, it enters the inside of the guide cylinder part 13, and this integrated by. Also, one of the paired inner dies 8°9 has a circular convex portion 14 that is press-fitted into the inside of the set semi-finished product 1', and the other has a concave portion 15 that escapes from the convex portion 14. ing.

Now, in the shaping device 6 in which the semi-finished product 1' is set, the upper inner die 8 is lowered as shown in FIG. 4(b). Then, the semi-finished product 1' is pushed by the die 8 and descends together with the outer die while compressing the cushion 12. As a result, the outer diamond enters into the inside of the guide tube 13, thereby firmly pressing the semi-finished product 1' from the outside.

When the upper inner die 8 further descends, inner dies 8,
9 is press-fitted. In this way, the tapered portion 1b is formed by the inner die 8,
9, it is further expanded and pressed against the outer diamond, and is shaped as shown in FIG. 1(d). If the pressing force of the upper inner die 8 is released and the die 8 is pushed up as necessary, this semi-finished product 1'' is pushed up by the cushion 12.

Next, the semi-dressed product 1 with the tapered part 1b
It is set in the finishing molding device 16 as shown in the figure (,).

This finishing forming device 16 includes an outer periphery forming roller 17 which is a ring-shaped roller divided into a plurality of pieces in the circumferential direction, and a V-groove forming roller 18 inserted inside the ring-shaped roller 17 at intervals. I'm here. (2) The groove forming row 218 has a ring-shaped protrusion 19 with a triangular cross section on its outer peripheral surface.

For finishing forming, the semi-finished product 1'' is set inside the outer periphery forming row 217, the groove forming roller 18 is inserted inside, and both rollers 17 and 18 are rotated in the same direction as shown in FIG. As shown in b), the ring-shaped protrusion 19 is pressed against the back side of the bead portion 1a with its axis shifted.As a result, the bead portion 1a is pushed open to have a V-shaped cross section as shown in FIG.

In this way, a pulley 7 element 1'' having two V-grooves 1c on the outer periphery for receiving the V-belts is obtained.The cross-sectional shape of the ring-shaped protrusion 19 is made to match the angle of the V-groove 1c when completed.

Such a pulley element 1'' is finally fitted and fixed to the outer periphery of a rotor (not shown), thereby forming a W pulley.

[Brief explanation of drawings]

Figure 1 shows the manufacturing procedure of the W pulley according to the present invention.
(,) are cross-sectional views, and Figures 2 to 5 show specific examples of each manufacturing process, and (,) are before processing,
(b) is an explanatory diagram of the state after processing. 1... Cylindrical body, 1', 1"... Semi-finished product, 1"'...
・Pulley element. 1a...bead part, 1b...tapered part, 1c
...V groove. WIS1 Figure 2 Figure 3 Figure 4

Claims (1)

[Claims] 1. Prepare a metal cylindrical body with a short axial length,
Forming an outwardly bulging ring-shaped ped part in the axially intermediate part of the cylindrical body; Further, it is necessary to expand and shape the peed portion.