A precise analysis has been made on the crowning method for the type 3 worm gear. Firstly, the calculation method, which is to find the amount of the clearance between the thread surface of the worm and the modified tooth surface of the wheel in this crowning method, is obtained. This clearance is defined to be taken in the direction of circumference of the wheel and is calculated along the characteristic curve between the thread surface of the worm and the wheel tooth surface. Then, the design process for the hob, which cuts the modified wheel tooth surface so as to satisfy the given amount of the clearance, is clarified by using this calculation method. Theories in this analysis are verified by applying the calculation method and the design process to numerical examples of the type 3 worm gear. This calculation method and the design process are easily practicable by manufacturing engineers.
A Study of the Crowning Method for the Type 3 Worm Gear : An Analysis of a Calulation Method for the Basic Thread Surface of the Hob
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