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Intermittent Worm Drive

IP.com Disclosure Number: IPCOM000096637D
Original Publication Date: 1963-Sep-01
Included in the Prior Art Database: 2005-Mar-07
Document File: 2 page(s) / 39K

Publishing Venue

IBM

Related People

Vogel, R: AUTHOR

Abstract

Worm drive mechanisms with an intermittent or a periodically changing transmission ratio have a relatively large play between the worm and the worm gear. With this worm drive mechanism, any play between the worm and the worm gear is practically eliminated by using a specific configuration of the worm teeth.

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Intermittent Worm Drive

Worm drive mechanisms with an intermittent or a periodically changing transmission ratio have a relatively large play between the worm and the worm gear. With this worm drive mechanism, any play between the worm and the worm gear is practically eliminated by using a specific configuration of the worm teeth.

Worm 1 has teeth 3 which on one part of the periphery have a predetermined pitch and on the remaining part of the periphery have zero pitch. Worm gear 2 is in mesh with teeth 3 of worm 1. In the course of a 360 degrees rotation of worm 1, worm gear 2 is moved during a rotation of approximately 180 degrees. It is held in position during the subsequent rotation of the worm through 180 degrees. The guides formed by teeth 3 are of such a configuration that a tooth 4 of the worm gear abuts worm teeth 3 on both sides.

This occurs at any time both in the range of the pitch of worm teeth 3 and in the pitchless range, so that it is guided without play.

This is achieved by designing the grooves formed by teeth 3 as an addendum envelope of teeth 4.

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