| 摘要 |
PROBLEM TO BE SOLVED: To surely provide a helical concave conical gear provided with the predetermined main curvature radius with one working by expressing the relation between the basic data and the main curvature radius of a gear and a pitch radius and torsion angle of a rack type rotary tool with specified expressions. SOLUTION: A pitch radius rc and a torsion angleϕof a tooth trace of a generating rack type rotary tool are decided so as to satisfy expressions I, II, III, IV, V expressing the relation between a reference pitch radius rb, a pressure angleα0, a cone angleδ, each minimum curvature radius R and each maximum curvature radius R' at pitch points of a right and a left tooth surface of a gear and a pitch radius rc and a torsion angleϕof a tooth trace in the rack center surface of the generating rack type rotary tool. A helical concave conical gear, in which desirable teeth can contact with each other in the condition similar with the linear contact so as to have a large contact area and which can transmits a large motive power and which can restrict the gear noise, can be surely obtained.
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