Metal deforming – By use of tool acting during relative rotation between tool... – With metal deformation of different type
Patent
1996-07-08
1998-03-31
Larson, Lowell A.
Metal deforming
By use of tool acting during relative rotation between tool...
With metal deformation of different type
298923, B21H 104
Patent
active
057325812
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
1. Technical Field
The present invention relates to a method of producing a sheet metal poly-V groove pulley, and particularly to a method of producing a sheet metal poly-V groove pulley in which an ear consisting of a single material layer is annularly projected from an end of a drum wall having poly-V grooves with which a poly-V belt is to be engaged. A sheet metal poly-V groove pulley produced by the production method of the present invention may be used as, for example, a rotary part for transmitting rotation of an engine of an automobile.
2. Background Art
In a sheet metal poly-V groove pulley in which poly-V grooves are formed in a drum wall cylindrically extending from a base plate, an ear is formed annularly at an edge portion of the base plate side of the drum wall in order to prevent a poly-V belt from being disengaged.
A prior art method of providing a sheet metal poly-V groove pulley with such an ear is described in, for example, Japanese Patent Publication No. 57-18967. In the method described in the publication, a disc member is formed into a cup-like shape having a base plate and a drum wall, and a corner formed by the base plate and the drum wall is projected to have a double layer portion by predetermined means. The doubled portion, i.e., the double-layer portion having two material layers is used as an ear.
Another prior art method is described in, for example, Japanese Patent Publication No. 3-69611. In the method described in this publication, a disc member is formed into a cup-like shape having a base plate and a drum wall, and the root portion of the drum wall is split from the outside into two parts in the thickness direction of the base plate so that an ear having a single-layer structure or consisting of a single material layer is formed.
However, a method such as that described in Japanese Patent Publication No. 57-18967 in which a doubled portion produced by causing a corner formed by a base plate and a drum wall to be projected at double (double layer) by predetermined means is used as an ear has a problem in that it requires a material increased by the amount corresponding to the doubled structure of the ear and hence the material cost is raised. Furthermore, a sheet metal poly-V groove pulley in which an ear has a doubled structure has a problem in that, as a result of the use of the pulley, a crack easily occurs starting from the inner side of the front bent area of the double-layer portion.
In a method such as that described in Japanese Patent Publication No. 3-69611 in which the root portion of a drum wall is split into two parts in the thickness direction of a base plate so that an ear of a single-layer structure is formed, the base plate must have an increased thickness in order to ensure a required degree of the projection. At present, therefore, a disc member to be used as a starting material must satisfy the conditions that it has a thickness of at least about 2.6 mm so as to ensure a sufficient thickness of the base plate. In order to satisfy these conditions, a thick sheet metal member must be used as a disc member which is to be formed into a cup-like shape. In the state of the art, therefore, it is impossible to reduce the weight of such a pulley and its material cost.
SUMMARY OF THE INVENTION
The present invention was developed in view of the above-mentioned circumstances. It is an object of the present invention to provide a method of producing a sheet metal poly-V groove pulley, and a sheet metal poly-V groove pulley in which, even when a thin sheet metal member having a thickness less than 2.6 mm (for example, a sheet metal member of 2 mm) is used, the requirement of the projection degree in an ear of a single-layer structure can be sufficiently satisfied.
In order to attain the above-mentioned object, the method of producing a sheet metal poly-V groove pulley of the present invention comprises the steps of: holding and pressing a thickened annular peripheral wall of an outer peripheral side of a base plate to increase the axial
REFERENCES:
patent: 5072509 (1991-12-01), Bichel et al.
patent: 5123166 (1992-06-01), Kanemitsu et al.
patent: 5237744 (1993-08-01), Himmeroeder
Kanemitsu Toshiaki
Oda Kazuyuki
Sugimoto Shinji
Kabushiki Kaisha Kanemitsu
Larson Lowell A.
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