Method of producing a sheet metal gear
Number of patents in Portfolio can not be more than 2000
United States of America Patent
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Jan 25, 2000
Grant Date -
N/A
app pub date -
Feb 7, 1997
filing date -
Mar 1, 1996
priority date (Note) -
Expired
status (Latency Note)
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Abstract
The present invention relates to a method of producing a sheet metal gear in which a metal sheet (2) is used as a starting material and a gear is formed in the outer peripheral edge of the metal sheet. The object of the production method is to finish easily and accurately pitches of valleys and peaks of the gear which is formed in a simple production facility. The time period required for completing the formation of the gear in the outer peripheral edge of the metal sheet is shortened, thereby enhancing productivity. According to the production method, in the initial preparation step, a number of places of the outer peripheral edge of the circular metal sheet (2) which are arranged with a regular pitch are punched out in the axial direction, thereby forming preliminary valleys and preliminary peaks. Then, the method transfers to a gear forming step. In the gear forming step, a shaping roller which is rotated and follows the metal sheet increases the depth of the preliminary valleys to shape the valleys of the gear, and the height of the preliminary peaks to shape the peaks of the gear. The outer peripheral edge of the metal sheet is thickened as required before starting the preparation step.
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