JPH0293156A - Multistage pulley and manufacture thereof - Google Patents

Abstract

PURPOSE:To obtain the title device which is lightweight and possesses high strength by integrally forming a web part and a rim part from a metal disc and forming the rim part from a plurality of stepped parts which are formed in stepped form along the axial direction and forming a V-belt having a plurality of stripes in each rim part through rolling. CONSTITUTION:A multistage pulley 1 is shaped from a metal plate, and consists of a web part 2 and a rim part 3 formed on the outer periphery of the web part 2. In the rim part 3, the outer peripheral surface consists of the first and second rim parts 5 and 6 which are formed in stepwise form along the axial direction, and the V-grooves 8 and 9 having a plurality of stripes for laying a V-belt are formed on the first and second rim parts 5 and 6. Therefore, the multistage pulley which is lightweight and possesses high strength can be obtained.

Description

[Detailed Description of the Invention] [Objective of the Invention] (Industrial Application Field) The present invention relates to a multi-stage boot mainly used as a power transmission means of an automobile and a method for manufacturing the same, and particularly relates to a multi-stage boot that is lightweight and strong. This invention relates to an excellent multi-stage pulley and a method for efficiently and economically manufacturing the multi-stage pulley.

(Prior Art) Multi-stage pulleys, which are generally used to transmit rotational force from the engine of automobiles etc. to auxiliary equipment such as air conditioner compressors and power steering pumps via the crankshaft, have traditionally been used as multi-stage pulleys. The cast metal one shown in Figure 5 is widely used. However, this cast multi-stage pulley 31 not only is heavy, but also has problems in that it is difficult to balance the weight and tends to cause uneven rotation.

Therefore, recently, multistage pulleys made of metal plates are being used to improve the drawbacks of the above-mentioned cast multistage pulleys. An example of such a multistage pulley is shown in FIG. This multi-stage pulley 41 includes a first pulley component 41A in which a disc-shaped metal plate is slotted and then a V-groove is rolled in the slotted part, and a metal plate is bent and a V-groove is rolled in the bent part. It is constructed by combining the second pulley component 41B that has been manufactured and integrally caulked together with a rivet 42.

(Problems to be Solved by the Invention) The conventional multi-stage pulley 41 has a so-called two-piece structure, and therefore has the drawback that many steps are required for assembly and connection, resulting in high costs.

Moreover, if the conventional multi-stage pulley 41 described above is subjected to surface treatment such as plating or painting after being integrated, it will result in poor coating of the combined parts, penetration of the plating solution, and poor discharge. Second pulley component 41A, 41B
After each surface is treated separately, it must be integrated.

Therefore, it is impossible to use welding or the like as a means of integration, and at present, as shown in the figure, caulking, which is inferior in strength, has no choice but to be used. Furthermore, because of the two-piece bonding structure, there is a problem in that the gap 41a is reduced and there is a risk of interference with other parts.

An object of the present invention is to provide a multistage pulley that is lightweight and has excellent strength, and a method for manufacturing the multistage pulley efficiently and economically.

[Structure of the Invention] (Means for Solving the Problems) In order to achieve the above object, the multistage pulley according to the present invention has a web part and a rim part integrally formed from a metal disc,
The rim portion is composed of a plurality of rim portions formed in a step shape along the axial direction, and each rim portion is provided with multiple V grooves by rolling.

In addition, the method for manufacturing a multi-stage pulley according to the present invention includes bending the outermost periphery of a metal disk and forming a second flange portion having a first flange portion and at least one step portion perpendicular to the first flange portion along the axial direction. The flange portion is formed into a stepped shape, and then the outer circumferential surface of the second flange portion is rolled to form a rim portion provided with a V groove, and the outer circumferential surface of the first flange portion is further slotted. A V-groove is formed by forming the plastic rim.

(Function) According to the present invention, each rim portion formed in a step shape and provided with a V-groove can be integrally molded from a metal disk, and a multi-stage pulley that is lightweight and has high strength can be obtained. Furthermore, the manufacturing process can be simplified and manufacturing costs can be significantly reduced.

(Example) The present invention will be explained below based on embodiments shown in the drawings.

FIG. 1 is an explanatory longitudinal cross-sectional view showing a multistage pulley, and FIG. 2 is a process diagram showing a method for manufacturing the multistage pulley.

The multistage pulley 1 is formed from a metal plate, and has a web portion 2.
and a rim portion 3 formed around its outer periphery. The rim part 3 consists of a first rim part 5 and a second rim part 6, each of which has a stepped outer peripheral surface along the axial direction. The second rim portions 5 and 6 are provided with multiple V-grooves 8 and 9, respectively, for winding the belt.

Next, a method for manufacturing a multistage pulley according to the present invention will be explained based on FIG. 2.

As shown in FIG. 2(a), first, a disk-shaped metal plate 10 is bent by plastic forming to form a flange portion 11 forming the web portion 2 and the first rim portion 5, and a second rim portion. While forming an upright portion 12, a shaft hole 13 is punched in the center.

Subsequently, as shown in FIG. 2(b), the metal plate 10 with the support shaft 15 inserted into the shaft hole 13 is held between the clamp 16A and the clamp 16B, and the second flange portion 12 of the metal plate 10 is clamped. A groove forming roller 18 is brought into contact with the outer peripheral surface, and the forming roller 18 is pressed against the second flange 12 while rotating the forming roller 18 and the metal plate 10 synchronously. As a result, multiple V-grooves 9 are formed by rolling on the second flange portion 12, and the second rim portion 6 is formed.

Next, as shown in FIG. 2(C), the metal plate 10 is held and rotated from both sides by clamps 16G and 16D.
The slotted roller 19 is brought into contact with the outer peripheral edge of the first flange portion 11 of the metal plate 10 and is pressed against the first flange portion 11 while rotating synchronously. As a result, the outer peripheral edge of the first flange portion 11 is slotted to form a slotted portion 5a. The slotted portion 5a can be formed all at once using the slotted roller 19 as described above, but an expanding roller may be used in combination as necessary.

Next, as shown in FIG. 2(d), a groove forming roller 20 is brought into contact with the outer peripheral surface of the slotted portion 5a, and the forming roller 520 is rotated synchronously with the forming roller 20 and the metal plate 10. Push it into the slotted part 5a. As a result, multiple V-grooves 8 are formed in the first flange portion 11 by rolling.
A first rim portion 5 is formed.

Note that the grooves 8 and 9 are formed by forming rollers 19 and 20 as described above.
Although it can be formed all at once, a preforming roller may also be used if necessary.

3 and 4 relate to another embodiment of the present invention;
The figure shows a two-stage second rim portion 6A parallel to the second flange portion 12.
, 6B are provided. Further, in FIG. 4, the second flange portion 12 is provided with two stages of second rim portions 6G and 6D having different diameters. Further, the V-groove provided in each rim portion may be a mono-V groove.

Therefore, in the multi-stage pulley 1 of this embodiment, the metal plate 10 is
It is obtained by a simplified process of sequentially rolling the grooves, and it is lightweight because only the thickness of the metal plate 10 needs to be taken into account.Furthermore, it does not require the joining of two bodies as in the conventional method. The strength can be increased compared to conventional products.

[Effects of the Invention] As described above, the multistage pulley of the present invention is lightweight, has high strength, and can have a simple structure. Further, according to the method of the present invention, the process can be simplified and costs can be reduced, and the multi-stage pulley having the above-mentioned excellent performance can be manufactured efficiently and economically.

[Brief explanation of drawings]

1 and 2 relate to an embodiment of the present invention, FIG. 1 is a vertical cross-sectional explanatory diagram showing a multistage pulley, FIG. 2 is a process diagram showing a method for manufacturing the multistage pulley, and FIGS. 3 and 4 5 is an explanatory longitudinal cross-sectional view of a multi-stage pulley according to another embodiment of the present invention, FIG. 5 is an explanatory vertical cross-sectional view showing a conventional multi-stage cast pulley, and FIG. 6 is a longitudinal cross-sectional view of a conventional multi-stage metal pulley. It is an explanatory diagram. 1...Multi-stage pulley 2...Wear part 3...Rim part 5...First rim part 6...Second rim part 8.9...■Groove 10...Metal plate 11. ...First flange part 12...Second flange part 1...Multi-stage pulley 2...Web part 3...Rim part 5...First rim part 6...Second rim part agent Patent Attorney Yasuo Miyoshi Diagram 1

Claims (2)

[Claims] (1) A web part and a rim part are integrally molded from a metal disc, and the rim part consists of a plurality of rim parts formed in a step shape along the axial direction, and each rim part has a V-groove. A multistage pulley characterized by being provided by rolling. (2) The outermost periphery of the metal disk is bent to form a first flange part and a second flange part having at least one step part orthogonal to the first flange part in a stepped shape along the axial direction. After that, the outer circumferential surface of the second flange section was rolled to form a rim section with a V groove, and the outer circumferential surface of the first flange section was further slotted and rolled to provide a V groove. A method for manufacturing a multistage pulley, characterized by forming a rim portion.