Abstract
A new type hourglass worm gearing is presented in this paper. In this new type, the worm is a conventional Hindley type, but the number of teeth of the worm wheel and the center distance are smaller than the corresponding figures of the Hindley worm gearing. In this paper, the principle of the new worm gearing, the derivation of the basic equations and their applications to the new worm gearing are given. For comparison, the lines of contact on the tooth surface are obtained with examples of various types of worm gearing. The conclusion is as follows. The cylindrical worm gearing or the Hindley worm gearing can be regarded as a special case of the new worm gearing. The new worm gearing can be properly designed to circumvent the defects of the Hindley worm gearing and expected to have good performance.
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