Abstract
A new method of tooth surface modification for cylindrical worm gears is proposed. This method can always offer ideal tooth contact and no transmission error regardless of tooth profiles and addendum modification of worm gears. The method is realized by introducing a special hob with non-whole thread numbers and with a couple of hob flute numbers. Two kinds of worm gear pairs with convex and concave profiles and with positive and negative addendum modifications were designed and made on a basis of the proposed method. Clearances between the meshing teeth of the gear pairs were calculated and compared with that based on the previous tooth surface modification method and also tooth contact tests of the gear pairs were conducted under the loaded conditions. As a result, the desirable contact patterns that almost agree with calculated ones were obtained.
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