Abstract
Theoretically, the contact between tooth surfaces of a pair of conical involute gears is the point contact. Hence the tooth surface durability is small."Concave conical gear" was invented in order to overcome this weak point. This gear can be cut by gear shaper. In this paper, an allowable normal load of a pair of concave conical gears that cut by this method is obtained, which is larger than that of a pair of conical involute gears. Thus it is proven that this cutting method is of practical use.
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