JP2916763B2 - Method of manufacturing pulley - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a metal plate pulley material formed in a cylindrical body having a bottom, a bottom portion serving as a support portion, and a cylindrical portion bent in the circumferential direction to form a V-groove to form a belt hook portion. And a method of manufacturing a pulley.

[0002]

2. Description of the Related Art Pulleys have been mainly manufactured by casting or lathe cutting. However, recently, from the viewpoint of weight reduction and ease of manufacture, a metal plate pulley material is formed by drawing. A method of forming a bottomed cylindrical body, bending the cylindrical portion in the circumferential direction to form a V-groove, and using the V-groove as a belt hanging portion has been increasingly used.

In the pulley according to this method, since a cylindrical portion is bent to form a V-shaped groove, it is difficult to form a V-shaped groove if the cylindrical portion is thick. Conventionally, this type of pulley is generally used. It is manufactured only from a metal plate having a thickness of about 2 mm.

[0004] For this reason, the strength of the support portion serving as the mounting portion is weak. For example, when the support portion is used for automobiles or industrial vehicles with a heavy load, as shown in FIG. For example, a metal plate 29 may be applied to a vehicle or the like with screws, or as shown in FIG. 16, the reinforcing metal plate 29 may be fixed to the support portion 7 of the pulley by welding or the like.

[0005]

According to the pulley manufactured by the above-mentioned conventional method, especially when the pulley is used for an automobile or an industrial machine with a large load, as shown in FIGS. The reinforcing metal plate 29 is provided on the support 7.
According to the reinforcing means shown in FIG. 15, when the pulley is attached, the metal plate 29 for reinforcement is applied to both sides of the support portion 7 of the pulley and tightened with a screw or the like. Fixing requires a lot of time and labor for installation work, increases the number of parts, and is cumbersome to use.In addition, the required accuracy such as flatness and parallelism of the pulley mounting surface required for mounting is obtained. However, there is a problem that the cost is high and the cost is high.

Further, according to the reinforcing means shown in FIG. 16, similarly to the reinforcing means shown in FIG. 15, since the reinforcing metal plate 29 is fixed to the support portion 7 as a separate member, the flatness of the mounting surface of the pulley can be improved. There is a problem that it is difficult to obtain accuracy such as degree, and the number of manufacturing steps is increased, resulting in an increase in cost.

An object of the present invention is to provide a method of manufacturing a pulley for obtaining a pulley having high strength and high precision from a single metal plate.

[0008]

According to a first aspect of the present invention, there is provided a pulley manufacturing method comprising forming a metal plate pulley material into a bottomed cylindrical body, using the bottom portion as a support portion, bending the cylindrical portion in a circumferential manner, and forming a V-shaped pulley. In the method of manufacturing a pulley in which a groove is formed and used as a belt hanging portion, the cylindrical portion is formed into a predetermined thickness by pressing or spinning or the like, and the thinned cylindrical portion is bent in a circumferential direction to form a V. It is characterized in that a groove is formed.

According to a second aspect of the present invention, a metal plate pulley material is formed in a bottomed cylindrical body, a bottom portion is used as a support portion, and the cylindrical portion is bent in a circumferential manner to form a V-groove to form a belt hook portion. In the method of manufacturing a pulley, when forming the bottomed cylindrical body,
An ironing process is simultaneously performed by drawing and pressing by pressing or spinning to form a cylindrical portion thinned to a predetermined thickness, and the cylindrical portion is bent in the circumferential direction to form a V-groove.

According to such a method of manufacturing a pulley, since the V-groove is formed by thinning the cylindrical portion by pressing or spinning, the thickness of the metal plate pulley material can be determined to be large, and the strength can be reduced. It is possible to obtain a pulley having a support part having a large thickness. In addition, since the support portion is an integral body, it is easy to obtain accuracy such as dimensions, flatness, and parallelism of the pulley mounting surface.

Furthermore, since the number of parts is smaller than that of a conventional pulley to which a reinforcing metal plate is attached, management is easy, and the number of manufacturing steps is small, so that it can be obtained at low cost.

[0012]

1 to 8 are process diagrams showing an example of an embodiment of a method of manufacturing a pulley according to the present invention.

First, a metal plate having a thickness sufficient to satisfy the strength required for a support portion serving as a mounting portion of a pulley is prepared, and formed into a circle having a predetermined diameter by pressing.
A metal plate pulley blank 1 having a mounting hole 2 formed at the center and a screw hole 3 around the mounting hole 2 is formed (FIG. 1).

Next, the metal plate pulley material 1 is squeezed by a press die 4 to form a bottomed cylindrical body 5 (FIG. 2). The belt hook 9 will be described later. The mounting hole 2 and the screw hole 3 are located on the support 7 (FIG. 3).

Next, the bottomed cylindrical body 5 is provided with a clamper 10 which comes into contact with the inner peripheral surface of the cylindrical portion 8 and the inner surface of the support portion 7 from both sides while leaving the outer peripheral surface of the cylindrical portion 8, 7 is clamped by a clamper 11 which is in contact with the outer side surface.

Then, a cylindrical press die 13 having an annular projection 12 on the inner peripheral surface is fitted to the outer periphery of the cylindrical portion 8 from the support portion 7 side. In the press die 13, the inner diameter of the annular protrusion 12 on the inner peripheral surface is smaller than the outer diameter of the cylindrical portion 8 and larger than the inner diameter of the cylindrical portion 8. The difference between the inner diameter of the annular projection 12 of the press die 13 and the inner diameter of the cylindrical portion 8 is determined by the thickness required of the cylindrical portion 8. That is,
When the cylindrical portion 8 and the press die 13 are concentrically positioned, the dimension between the inner circumference of the cylindrical portion 8 and the inner circumference of the annular protrusion 12 of the press die 13 is reduced to the thickness required by the cylindrical portion 8. Is set.
In this example, it is set to 2 mm.

The press die 13 is mounted on the outer periphery of the cylindrical portion 8.
When the cylindrical portion 8 is fitted and pressed from the support portion 7 side, the thickness of the cylindrical portion 8 is squeezed in the opening direction by the annular protrusion 12 to form the above-mentioned set thickness of 2 mm (FIG. 4). The bottomed cylindrical body 5 composed of the portion 7 and the thin cylindrical portion 8 is formed (FIG. 5).

As means for making the cylindrical portion 8 thin, not only the press die 13 but also a support portion 7 on the outer peripheral surface of the cylindrical portion 8 clamped by the clampers 10 and 11 as shown in FIG. Press roller 14 from side
By pressing, the cylindrical portion 8 can be squeezed in the opening direction, and the thickness of the cylindrical portion 8 can be formed to a predetermined thickness (thinning).

Next, the bottomed cylindrical body 5 whose cylindrical portion 8 has been thinned as described above is clamped by clampers 15 and 16, and V-groove forming rollers 17 and 18 are formed on the outer peripheral surface and the inner peripheral surface of the cylindrical portion 8. To form a predetermined V-groove 19 by bending the cylindrical portion 8 in the circumferential direction to form the belt hooking portion 9 (FIG. 7), thereby completing the pulley (FIG. 8). The means for bending the cylindrical portion 8 to form the V-groove 19 is known and is not particularly limited.

FIGS. 9 to 13 are process diagrams showing another embodiment of the method of manufacturing a pulley according to the present invention.

First, a metal plate pulley blank 1 having a mounting hole 2 at the center and a screw hole 3 around the mounting hole 2 is formed as in FIG. 1 (FIG. 9).

Next, the metal plate pulley material 1 is clamped from the front and back sides by columnar clampers 21 and 22 except for a predetermined annular surface 20 for forming a cylindrical portion on the outer peripheral edge. A pressing roller 23 is pressed against the inner peripheral position of the annular surface 20 from the front side of the material 1, and the annular surface 20 is squeezed into a cylindrical shape by spinning which moves the pressing roller 23 in parallel with the axis of the clamper 21. By squeezing the portion of the annular surface 20 between the clamper 21 and forming the thickness of the portion to a predetermined thickness (thinning) (FIG. 10), the thick supporting portion 7 and the thick portion are formed. A bottomed cylindrical body 5 composed of a thin cylindrical portion 8 is formed.
1).

The annular surface 20 of the metal plate pulley material 1
As a means for forming the cylindrical portion 8 which is made thinner by squeezing the meat, it can be formed not only by the spinning but also by a press using the press die 13 shown in FIG.

Next, the bottomed cylindrical body 5 whose cylindrical portion 8 is thinned as described above is clamped by clampers 24 and 25, and V-groove forming rollers 26 and 27 are formed on the outer peripheral surface and the inner peripheral surface of the cylindrical portion 8. To form a predetermined V-groove 19 by bending the cylindrical portion 8 in the circumferential direction to form the belt hooking portion 9 (FIG. 1).
2) This completes the pulley (FIG. 13).

Each of the pulleys (FIGS. 8 and 13) completed in the steps described in the above embodiment has a screw hole 3 formed around the mounting hole 2 formed in the support portion 7. However, the boss 28 can be fixed to the support portion 7 as shown in FIG.

[0026]

As described above, according to the method of manufacturing a pulley according to the present invention, the thickness of the support portion serving as a mounting portion to be mounted on an automobile, an industrial machine, or the like can be determined for the manufactured pulley. Since it can be made, it has high strength and excellent durability, and it can be formed from a single metal plate, so the accuracy of the dimensions, flatness, parallelism, etc. of the support part to be the pulley mounting part can be easily obtained and managed. And the mounting work is easy, and the number of manufacturing steps is small, so that it can be obtained at low cost.

[Brief description of the drawings]

FIG. 1 is a process diagram showing an example of an embodiment of a method for manufacturing a pulley according to the present invention.

FIG. 2 is a process diagram showing an example of an embodiment of a method for manufacturing a pulley according to the present invention.

FIG. 3 is a process diagram showing an example of an embodiment of a method for manufacturing a pulley according to the present invention.

FIG. 4 is a process diagram showing an example of an embodiment of a method for manufacturing a pulley according to the present invention.

FIG. 5 is a process diagram showing an example of an embodiment of a method for manufacturing a pulley according to the present invention.

FIG. 6 is a process diagram showing an example of an embodiment of a method for manufacturing a pulley according to the present invention.

FIG. 7 is a process chart showing an example of an embodiment of a method for manufacturing a pulley according to the present invention.

FIG. 8 is a sectional view showing the pulley completed in the steps of FIGS. 1 to 7;

FIG. 9 is a process chart showing another example of the embodiment of the method of manufacturing a pulley according to the present invention.

FIG. 10 is a process chart showing another example of the embodiment of the method of manufacturing a pulley according to the present invention.

FIG. 11 is a process chart showing another example of the embodiment of the method of manufacturing a pulley according to the present invention.

FIG. 12 is a process diagram showing another example of the embodiment of the method for manufacturing a pulley according to the present invention.

FIG. 13 is a sectional view showing the pulley completed in the steps of FIGS. 9 to 12;

FIG. 14 is a sectional view showing another example of a pulley completed by the invention.

FIG. 15 is a sectional view showing an example of a conventional pulley.

FIG. 16 is a sectional view showing another example of the conventional pulley.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Metal plate pulley material 2 Mounting hole 3 Screw hole 4 Press type 5 Bottomed cylindrical body 6 Bottom part 7 Support part 8 Cylindrical part 9 Belt hook part 10, 11 Clamper 12 Annular projection 13 Press type 14 Press roller 15, 16 Clamper 17 , 18 V-groove forming roller 19 V-groove 20 Annular surface 21, 22 Clamper 23 Press roller 24, 25 Clamp 26, 27 V-groove forming roller 28 Boss

Claims (2)

(57) [Claims] 1. A method of manufacturing a pulley in which a metal plate pulley material is formed into a bottomed cylindrical body, a bottom portion is used as a support portion, and the cylindrical portion is bent in a circumferential manner to form a V-groove to form a belt hook portion. A method of manufacturing a pulley, wherein the cylindrical portion is formed into a predetermined thickness by pressing or spinning or the like, and the thinned cylindrical portion is bent in a circumferential direction to form a V-groove. 2. A method of manufacturing a pulley in which a metal plate pulley material is formed in a cylindrical body having a bottom, a bottom portion is used as a support portion, and the cylindrical portion is bent in a circumferential manner to form a V-groove to form a belt hook portion. At the time of forming the bottomed cylindrical body, drawing and ironing are simultaneously performed by pressing or spinning to form a cylindrical part thinned to a predetermined thickness, and the cylindrical part is bent in the circumferential direction to form a V-groove. Forming a pulley.