Manufacturing method for an elliptic gear
AssigneeShimano Industrial Company Limited
InventorMasashi Nagano
Life of this patent
Estimating the term…
Abstract
The method includes providing an aluminum plate having an outer peripheral portion in an elliptic shape, the outer peripheral portion including a plurality of tooth portions. An intermediate element is formed by pressing the aluminum plate to cause the outer peripheral portion of the plate to project unidirectionally in a thickness direction with respect to a radially inward portion of the intermediate element to form a flange at the outer peripheral portion. The plurality of tooth portions are formed at this flange. A plurality of teeth members are formed by cutting the flange of the intermediate element in a thickness direction thereof at an outer surface in a projecting direction of the flange to reduce the thickness of the flange relative to the thickness of the intermediate element.
Claims4
A manufacturing method for a elliptic gear, said method compriisng the steps of:
- (a) providing an aluminum plate having an outer peripheral portion in an elliptic shape,
- (b) forming an intermediate element having a substantially cup-shaped cross-section by pressing said aluminum plate to cause said outer peripheral portion of said plate to project unidirectionally in a thickness direction of said intermediate element with respect to a radially inward portion of said intermediate element to form a flange at said outer peripheral portion, and
- (c) forming a plurality of teeth members at said outer peripheral portion by cutting said flange of said intermediate element in a thickness direction thereof at an outer surface in a projecting direction of said flange to reduce a thickness of said flange relative to a thickness of said intermediate element.
Dependencies are inferred from the claim text.