Metal deforming – By use of tool acting during relative rotation between tool... – With cutting of work or product
Patent
1998-03-17
2000-01-11
Larson, Lowell A.
Metal deforming
By use of tool acting during relative rotation between tool...
With cutting of work or product
72110, 29892, B21H 100
Patent
active
060123184
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to a method of producing a sheet metal pulley for a V belt, and more particularly to a method of producing a sheet metal pulley for a V belt in which there is no room for the production of material loss due to a cutting operation. A sheet metal pulley for a V belt which is obtained by the production method of the present invention has plural valley portions around which V belts are to be wound. Such a sheet metal pulley for a V belt can be used as a pulley for an alternator of a diesel engine.
BACKGROUND ART
In a prior art pulley for a V belt having plural valley portions around which plural V belts are to be wound, the plural valley portions for winding V belts are formed by a cutting operation. However, such a cutting operation produces a large amount of waste material. This waste material results in a material loss and causes an economical problem. Furthermore, cut chips scatter, and thereby impair the environment of a factory.
SUMMARY OF THE INVENTION
It is an object of the present invention to provide a method of producing a sheet metal pulley for a V belt which does not impair the environment of a factory, which does not produce waste material, and which can produce a sheet metal pulley for a V belt having plural valley portions for winding V belts.
According to the method of producing a sheet metal pulley for a V belt of the present invention, in a sheet metal cylindrical member having a cylindrical portion in an outer periphery of a circular base plate portion, the cylindrical portion extending in elongation on one side of the base plate portion. In the cylindrical portion, on a side of the base plate portion, an annular first valley portion which is opened in a V-like shape is formed by slitting a root portion of the cylindrical portion and the outer periphery of the base plate portion continuous to the root portion, and, in the cylindrical portion on a side opposite to the base plate portion, an annular second valley portion is formed by inwardly bending the cylindrical portion.
This method is suitable for the production of a sheet metal pulley for a V belt around which two separate V belts are to be wound. When this method is employed, a light-weight sheet metal pulley for double V belts can be produced which has the first valley portion formed on the cylindrical portion of the sheet metal cylindrical member by slitting, and the second valley portion formed by bending, and in which the material is not wastefully used.
In the method of producing a sheet metal pulley for double V belts, preferably, in a sheet metal cylindrical member having a cylindrical portion in an outer periphery of a circular base plate portion, the cylindrical portion extending in elongation on one side of the base plate portion, an annular first valley portion which is opened in a V-like shape is formed by slitting a root portion of the cylindrical portion, and the outer periphery of the base plate portion continuous to the root portion, and a cylindrical portion for forming a second valley portion is formed to be continuous to the first valley portion. Thereby, an intermediate shaped member is formed which has the first valley portion in the outer periphery of the base plate portion and in which the cylindrical portion for forming the second valley portion is continuous to the first valley portion, and, while applying a pressing force in an axial direction to the cylindrical portion of the intermediate shaped member, an intermediate portion in the axial direction of the cylindrical portion is thereafter pressed in a radial direction to be inwardly bent, thereby shaping the pressed portion into the annular second valley portion.
When this method is employed, there is merit in the fact that the height of an annular chevron peak formed between the first valley portion and the second valley portion is prevented from being lowered. This enhances the accuracy of the obtained sheet metal pulley for a V belt.
In the method of producing a sheet metal pulley for double V belts, mo
REFERENCES:
patent: 4524595 (1985-06-01), Oda
Fujii Naoki
Harada Kunihiro
Kanemitsu Toshiaki
Kabushiki Kaisha Kanemitsu
Larson Lowell A.
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