Helical gear and method of manufacturing the same
AssigneesAisin Ai Co., Ltd., Toyota Jidosha Kabushiki Kaisha
InventorsShinji Kitaoka, Keisuke Atsumi, Koji Takaira, Seiji Hiroshima, Takaaki Shimizu
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Abstract
A method of manufacturing a helical gear, includes a gear cutting process for forming a roughly-processed gear by applying a gear cutting to an outer circumferential surface of a blank, and a tooth surface forming process for forming a tooth surface by pressing a rolling die against a roughly-processed tooth surface of the roughly-processed gear, wherein a length of a portion of the roughly-processed tooth surface, to which a plastic deformation is applied by the rolling die, in a face width direction is formed to be shorter than a length of a face width of the roughly-processed tooth surface.
Claims16
A method of manufacturing a helical gear, comprising:
- a gear cutting process for forming a roughly-processed gear by applying a gear cutting to an outer circumferential surface of a blank;
- and
- a tooth surface forming process for forming a tooth surface by pressing a rolling die against a roughly-processed tooth surface of the roughly-processed gear to apply a plastic deformation to the roughly-processed tooth surface by the rolling die, wherein
- a length of the roughly-processed tooth surface of the roughly-processed gear, to which the plastic deformation is applied by the rolling die is shorter in a face width direction than an entire length of the roughly-processed tooth surface of the roughly-processed gear in the face width direction;
- and
- wherein the length of the roughly-processed tooth surface of the roughly-processed gear being processed varies during the tooth surface forming process.
A method of manufacturing a helical gear, comprising:
- gear cutting an outer circumferential surface of a blank to form a roughly-processed gear with teeth each having a roughly-processed tooth surface possessing a face width and also possessing an entire area;
- pressing a rolling die against only a part of the entire area of the roughly-processed tooth surface of the roughly-processed gear to effect plastic deformation of only the part of the entire area of the roughly-processed tooth surface area by the rolling die;
- and
- the face width of the part of the entire area of the roughly-processed tooth surface that is subject to the plastic deformation as a result of the pressing by the rolling die being less than the face width of the entire area of the roughly-processed tooth surface of the roughly-processed gear, the face width of the part of the entire area of the roughly-processed tooth surface subject to the plastic deformation also varying during the pressing by the rolling die.
Dependencies are inferred from the claim text.