JPH0790309B2 - Sheet metal poly V groove pulley and method of manufacturing the same - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sheet metal poly V groove pulley and a method for manufacturing the same.

[0002]

2. Description of the Related Art A sheet metal poly-V grooved pulley of this type is often used by being interposed in a rotation transmission path between an engine and a load. Japanese Examined Patent Publication No. 1-44420 discloses that a sheet metal poly-V grooved pulley of the type described above can be manufactured by subjecting a single metal plate to draw forming or rolling. A sheet metal poly V-groove pulley manufactured by the method described in this publication has V grooves formed annularly at a plurality of axial positions on a cylindrical body wall, and has one end portion in the axial direction on the body wall. A brim-shaped ear portion whose diameter is expanded outward in the axial direction is provided at each of the other end portion.

[0003]

A plurality of Vs are formed on the cylindrical body wall.
Since the sheet metal poly V groove pulley having the poly V groove formed by the groove and the ear portion is often held and handled by hand, a material fracture surface or a base material skin is formed on the outermost peripheral portion thereof. If exposed, there is a risk of injury to fingers. Also, in order to eliminate such danger, if the end surface treatment such as cutting and polishing is applied to the material fracture surface exposed on the end surface and the base material skin, the unavoidable chips will be economical and hygienic. This may have an adverse effect, and in some cases, the sheet metal poly-V groove pulley may have a strength problem due to the above cutting and polishing.

The present invention has been made under the above circumstances, and a sheet metal poly-V groove pulley having a structure in which the material fracture surface and the base material skin are not exposed at the outermost peripheral portion of the sheet metal poly-V groove pulley. The purpose is to provide.

Further, according to the present invention, a sheet metal poly-V groove pulley having a structure in which a material fracture surface and a base material skin are not exposed at the outermost peripheral portion of the sheet metal poly-V groove pulley is manufactured without cutting or polishing. An object of the present invention is to provide a method for manufacturing a sheet metal poly-V groove pulley that can be used.

[0006]

A sheet metal poly-V grooved pulley according to claim 1 has a cylindrical body wall having an opening at least at one end in the axial direction and having an end face at the peripheral edge of the opening. A V-groove is formed into a ring shape at a plurality of axial positions of the trunk wall by performing a poly V-groove molding step, and an ear molding step is performed to axially outwardly at one axial end of the trunk wall. In a sheet metal poly-V groove pulley having a flange-shaped ear portion whose diameter is expanded toward the end, the end surface of the ear portion corresponds to the end surface of the body wall, and the end surface of the ear portion has a radius of the ear portion. The direction is inward.

According to a second aspect of the present invention, there is provided a method for manufacturing a sheet metal poly-V grooved pulley, wherein a poly-V groove is formed on a cylindrical body wall having an opening at least on one end side in the axial direction and an end face located at a peripheral portion of the opening. A groove forming process is performed to form V at a plurality of axial positions on the body wall.
The groove is formed in an annular shape, and a flange-shaped ear portion whose diameter is expanded outward in the axial direction is formed at one end portion in the axial direction of the body wall by performing the ear portion molding step. In the method for manufacturing a V-groove pulley, in the ear forming step, one end portion of the body wall in the axial direction is formed into a brim shape projecting outward in the axial direction to form a flange shape, and the end surface of the body wall is radially outwardly formed. Ear end preforming step of forming a rough ear portion in which the end surface of the body wall after the movement is moved to one side to form a rough ear portion, and the inner peripheral surface of the rough ear portion is supported by an inner mold, and Corresponding to the end surface of the body wall by pressing the molding surface of the outer mold having the grooved molding surface on the outer peripheral surface of the rough ear portion and pressing the rough ear portion inward in the radial direction of the body wall. And an end surface treatment step of directing the end surface of the rough ear portion inward in the radial direction of the rough ear portion.

According to a third aspect of the present invention, there is provided a method of manufacturing a sheet metal poly-V groove pulley according to the second aspect, further comprising a poly-V groove forming step of annularly forming V grooves at a plurality of axial positions of a body wall.
This is performed in parallel with the end face treatment process.

[0009]

In the sheet metal poly V groove pulley according to the present invention, the poly V groove is formed by performing the poly V groove forming step on the cylindrical body wall. The end face of the cylindrical body wall is never exposed.
Further, in the ear part formed by performing the ear part forming step on the cylindrical body wall, the end surface of the ear part corresponding to the end surface of the body wall faces inward in the radial direction of the ear part. Therefore, the end surface of the body wall is not exposed at the outermost peripheral portion of the ear portion. Therefore, even if you handle the sheet metal poly V groove pulley by hand,
It becomes difficult for the fingers to touch the fractured surface of the material such as the end surface of the body wall or the skin of the base material.

According to the method for manufacturing a sheet metal poly-V grooved pulley according to the inventions of claims 2 and 3, the sheet metal poly-V grooved pulley having the construction of claim 1 is manufactured without cutting or polishing. can do.

[0011]

1 is a sectional view of a sheet metal poly-V grooved pulley A according to an embodiment of the invention described in claim 1, and FIG. 2 is an enlarged schematic perspective view of an essential portion of the sheet metal poly-V grooved pulley. .

In this sheet metal poly-V groove pulley (hereinafter, simply referred to as poly-V groove pulley in the description of the embodiment) A,
V-shaped grooves 2 are formed in an annular shape at a plurality of axial positions of a cylindrical body wall 1 having an opening 12 at one end in the axial direction, and a group of these V-shaped grooves 2 constitutes a poly-V groove 20. .
Further, flange-shaped ears 3, 4 whose diameter is expanded outward in the axial direction of the body wall 1 are formed on each of the axial direction one end portion and the axial direction other end portion of the body wall 1.

The ear portion 3 formed at one axial end of the body wall 1 has its end face 31 located at the inner peripheral portion of the ear portion 3 and directed radially inward. Here, the end surface 31 of the ear 3
Corresponds to the portion that was originally the end surface 11 (see FIGS. 6 to 8) of the body wall 1. And the end surface 11 of the body wall 1
Was located at the peripheral portion of the opening 12 before the ear 3 was molded, and is formed by, for example, a fracture surface. The poly V groove 20 described above is formed by performing a poly V groove forming step on the body wall 1, and the ear portion 3 at one axial end of the body wall 1 is formed on the body wall 1.
It is molded by performing an ear molding step on the. Details of the poly V groove forming step and the ear forming step will be described later.

The ear portion 4 formed on the other axial end portion of the body wall 1 is formed by folding back two layers of material. The step of molding the ear portion 4 will also be described later.

Poly-V grooved pulley A constructed as described above
In, the outer diameter of the two ears 3 and 4 is the poly V groove 20.
It is larger than the outer diameter of. Also, poly V groove 2
0 or the surface of the ear portion 3 at one axial end of the body wall 1 is a smooth molding surface having no edge portion formed by undergoing the poly V groove molding process or the ear molding process. Since the surface of the ear portion 4 at the other axial end portion of 1 is also a smooth surface,
There is no risk of fingers being injured even if the poly V-groove pulley A is handled by holding each of these surfaces by hand. In addition, the end surface 31 of the ear portion 3 formed by the fracture surface is located at the inner peripheral portion of the ear portion 3 and faces inward in the radial direction, so that the poly V
Even if the grooved pulley A is held by hand, there is almost no risk of the fingers touching the end surface 31, so there is almost no risk of the fingers being injured by the end surface 31 of the ear portion 3.

Next, with reference to FIGS. 3 to 10 and 11, a method of manufacturing a poly V groove pulley according to the embodiments of the invention described in claims 2 and 3 will be described. It should be noted that this embodiment is also a specific method of manufacturing the poly V groove pulley A described in FIGS. 1 and 2.

To manufacture the poly V groove pulley A, a disk-shaped metal plate (sheet metal material) P having a predetermined thickness shown in FIG.
Is used as a starting material, and the outer peripheral end surface of the plate P is indicated by a black circle P1.

As shown in FIG. 4, the plate P is the inner mold 10
It is formed into a cup shape by going through a drawing process using 0 and the outer die 200. The arrow X1 represents the downward movement state of the movable outer die 200. The cup-shaped material B thus obtained has an extra collar portion B1 produced by the drawing process.
Is formed, and the end surface (indicated by a black circle) of the flange portion B1 is the outer peripheral end surface P1 of the plate P itself.

Next, as shown in FIG. 5, the inner pressers 110, 12
0 and the pre-step pushing roller 210 are used to pre-roll the base plate portion B2 of the cup-shaped material B of FIG. 4 to form the stepped cup-shaped material C having the inclined step portion B3. After that, as shown in FIG. 6, the surplus flange portion B1 included in the stepped cup-shaped material C is cut off by using the inner die 130, the pressing die 220, the shearing roller 300, and the like.

In the stepped cup-shaped material C obtained through the above-mentioned steps, the cylindrical body 1 has an opening 12 at one axial end, whereas the body 1 of the body 1 has The other end portion in the axial direction is integrally provided with a base plate portion B2 having the inclined step portion B3. In addition, an end face 11 (shown by a black circle), which is a sheared surface (broken surface) generated by cutting off the excess flange portion B1 by the shear roller 300, is exposed at the peripheral portion of the opening 12 in the body portion 1. It will be.

The body portion 1 of the stepped cup-shaped material C obtained by cutting off the excess flange portion B1 is thickened. This thickening step consists of the preliminary step of FIG. 7 and the main step of FIG. As shown in FIG. 7, in the preliminary process, the stepped cup-shaped material C is fitted into the inner mold 140, and the body 1 is inserted between the lower mold 150 and the upper mold 230.
Is a step of bending the body 1 toward the outer peripheral side by narrowing the space between the lower mold 150 and the upper mold 230 by sandwiching the. The stepped cup-shaped material C that has undergone this preliminary step is transferred to this step. As shown in FIG. 8, in this process, the stepped cup-shaped material C is interposed between the inner rotating mold 160 and the upper rotating mold 240 to prevent the axial length of the body portion 1 from extending, and to rotate the pressing idler roller. The body 1 is pressed radially inward by the outer mold 170. As a result, the body portion 1 is plastically deformed and thickened.

Simultaneously with the above process, the ear preforming process described below is performed. The rotary inner mold 160 is provided with a recess 161 so as to correspond to the ear preforming process. Therefore, at the same time when the body 1 is pressed by the outer die 170, the ear preforming step is performed, and the one end in the axial direction of the body 1 is moved by the cooperation of the recess 161 of the rotating inner die 160 and the outer die 170. A brim-shaped rough ear portion 3 ′ is formed which projects outward in the axial direction in a radially expanding manner. An end surface 31 '(indicated by a black circle) located at the outermost peripheral portion of the rough ear portion 3'formed in the ear preforming step is the end surface 11 itself of the body wall 1. Therefore, the end surface 31 'of the rough ear portion 3'is formed in the process in which one axial end portion of the body wall 1 is formed into the brim shape as described above.
The end surface 11 of is moved outward in the radial direction.

In this embodiment, the ear portion 4 at the other axial end of the body portion 1 is simultaneously performed at the same time as this step and the ear portion preforming step.
Is molded. In order to be able to cope with the molding process of the ears 4, the outer mold 170 is provided with a convex forming surface 171 and a recess 172 that follows the convex forming surface 171. The pressing surface 24 corresponding to the recess 172
1 is provided. Therefore, in the molding step, the ear 4 is folded back to the other axial end of the body 1 by the cooperation of the convex forming surface 171 and the recess 172 of the outer die 170 and the pressing surface 241 of the rotary upper die 240. The ears 4 of the are molded.

For the stepped cup-shaped material C which has undergone the above-mentioned ear preforming step and the like, the end face processing step and the poly V groove forming step shown in FIGS. 9 and 10 are simultaneously performed. In each of these steps, an inner mold 180, an upper mold 250, and an outer mold 190 including a pressing roller are used. The inner die 180 has a corrugated surface 181 for supporting the inner peripheral surface of the body of the stepped cup-shaped material C.
And a tapered surface 182 that supports the inner peripheral surface of the rough ear portion 3 '. The outer mold 190 is provided with a plurality of chevron-shaped convex surfaces 191 for molding the poly V groove, a concave groove-shaped molding surface 192 corresponding to the outer peripheral surface of the rough ear portion 3 ', and the like. Then, the stepped cup-shaped material C together with the inner mold 180 and the upper mold 250
By bringing the outer mold 190 closer to the stepped cup-shaped material C while rotating the, the end face processing step and the poly V groove forming step are performed concurrently.

In the end face processing step, as shown in phantom lines in FIG. 11 and FIG. 9, the outer peripheral surface of the rough ear portion 3 '(indicated by phantom lines) whose inner peripheral surface is supported by the inner mold 180 is shown. Outer mold 190
Is performed by pressing the molding surface 192 of the above to press the rough ear portion 3 ′ inward in the radial direction of the body wall 1 (indicated by a leftward arrow Y in FIG. 11), and through this step, The end surface 31 'of the rough ear portion 3'is a rough ear portion 3'.
It will face inward in the radial direction. Therefore, the end surface 31 (indicated by a black circle) of the finally formed ear portion 3 faces inward in the radial direction of the body portion 1 as described with reference to FIG. This end face processing step involves plastic deformation of the rough ear portion 3 '.

In the poly V groove forming step, the poly V groove 20 is formed on the body portion 1 of the stepped cup-shaped material C by the plurality of chevron convex surfaces 191.
(See FIG. 1) is rolled.

In this embodiment, the end face treatment step and the poly V groove forming step are performed concurrently, but these steps may be performed separately. Further, in this embodiment, the surplus collar B formed on the body 1 is formed on the end surface 31 of the ear 3.
Although the fracture surface formed by cutting off 1 is equivalent, it is also possible to adopt a molding method that does not cause an extra collar B1. In that case, the end surface 31 of the ear 3 is a plate. It corresponds to the end surface P1 of P.

[0028]

The sheet metal poly-V according to the invention of claim 1
In the grooved pulley, since the end surface of the cylindrical body wall, which is the material fracture surface or the base material skin surface, is the end surface of the ear portion, and the end surface of the ear portion faces inward in the radial direction of the ear portion, The fractured surface of the material and the skin surface of the base material are not exposed at the outermost periphery of the sheet metal poly-V groove pulley. Therefore, even if the sheet metal poly V groove pulley is held and handled by hand, there is less risk of scratching the fingers due to the fractured surface of the material or the surface of the base material, and the safety for the assembly operator is improved. This effect is achieved even if the end surface of the ear is not cut or polished, so that the labor of cutting and polishing can be saved, the economic efficiency is improved, and chips are not generated. It is also preferable in that it is hygienic in that it is not likely to reduce the strength.

According to the method for manufacturing a sheet metal poly-V groove pulley according to the invention of claims 2 and 3, the sheet metal poly-V groove pulley having the construction of claim 1 is manufactured without cutting or polishing. Therefore, it is excellent in terms of economy and hygiene, and is also excellent in that there is no fear of reducing the strength of the manufactured sheet metal poly-V groove pulley.

[Brief description of drawings]

FIG. 1 is a sectional view of a sheet metal poly-V groove pulley according to an embodiment of the invention described in claim 1.

FIG. 2 is an enlarged schematic perspective view of a main part of the sheet metal poly-V groove pulley.

FIG. 3 is an explanatory view showing a cross-sectional shape of a plate.

FIG. 4 is an explanatory diagram of a drawing process.

FIG. 5 is an explanatory diagram of a step of forming a stepped cup-shaped material.

FIG. 6 is an explanatory diagram of a step of shearing an excessive collar portion.

FIG. 7 is an explanatory diagram of a preliminary step in the thickening step.

FIG. 8 is an explanatory diagram of this process in the thickening process.

FIG. 9 is an explanatory diagram of an initial stage of an end face processing step and a poly V groove forming step.

FIG. 10 is an explanatory diagram of the final stage of the end face processing step and the poly V groove forming step.

FIG. 11 is an explanatory diagram of an end face processing step shown in an enlarged manner.

[Explanation of symbols]

 A sheet metal poly V groove pulley 1 body wall 2 V groove 3 ears 3'coarse ears 11 body wall end face 12 open mouth 20 poly V groove 31 ears end face 31 'rough ears end face 180 inner mold 190 outside Mold 192 Molding surface

Claims (3)

[Claims] 1. A polycylindrical groove forming step is performed on a cylindrical body wall having an opening at least on one end side in the axial direction and whose end face is located at a peripheral edge portion of the opening, by performing a poly-V groove forming step at a plurality of axial positions on the body wall. The V-shaped groove is formed into a ring shape, and the edge portion forming step is performed to form a flange-shaped ear portion whose diameter is expanded outward in the axial direction at one axial end portion of the body wall. In the poly V groove made by sheet metal, the end surface of the ear portion corresponds to the end surface of the body wall, and the end surface of the ear portion faces inward in the radial direction of the ear portion. Pulley. 2. A poly-V groove forming step is performed on a cylindrical body wall having an opening at least on one end side in the axial direction and having an end face at the peripheral edge of the opening, and a plurality of axial locations of the body wall are formed by performing a poly-V groove forming step. The V-shaped groove is formed into a ring shape, and the edge portion forming step is performed to form a flange-shaped ear portion whose diameter is expanded outward in the axial direction at one axial end portion of the body wall. In the method for manufacturing a poly-made V groove pulley, the ear forming step forms an axial end of the body wall into a flange-like shape that projects outward in the axial direction and forms an end surface of the body wall with a radius. The ear part preforming step of forming a rough ear part in which the end surface of the body wall after the movement is located in the outermost peripheral part by moving outward in the direction, and the inner peripheral surface of the rough ear part is supported by the inner mold. , The outer peripheral surface of the rough ear portion is pressed against the molding surface of the outer die having a concave groove-shaped molding surface to move the rough ear portion to the half of the body wall. By pressing inward in the direction, an end surface treatment step of causing the end surface of the rough ear portion corresponding to the end surface of the body wall to be directed inward in the radial direction of the rough ear portion. Manufacturing method of V-groove pulley. 3. The method for manufacturing a sheet metal poly V groove pulley according to claim 2, wherein the poly V groove forming step of forming V grooves annularly at a plurality of axial positions of the body wall is performed concurrently with the end surface treatment step. A method for manufacturing a sheet metal poly V groove pulley.