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Rotary to Reciprocating Motion Converter

IP.com Disclosure Number: IPCOM000091459D
Original Publication Date: 1968-Feb-01
Included in the Prior Art Database: 2005-Mar-05
Document File: 2 page(s) / 63K

Publishing Venue

IBM

Related People

Price, GE: AUTHOR

Abstract

This device converts relatively high-speed rotary motion to low-speed reciprocating motion. Shaft 12 constantly rotates in a given direction to drive yoke 14 axially of such shaft. Surrounding shaft 12 is a ring of balls 16. On two opposing sides are ball races 18 which retain balls 16 and surround a portion, about 90 degrees, of shaft 12. Ball races 18 are carried in trunnions 22 whose axes intersect the axis of shaft 12 and are perpendicular to it. Ball races 18 are free to rotate in trunnions 22. Control arms 24 are moved by cam 26 on control shaft 28. The latter is arranged with its axis perpendicular to both shaft 12 and the trunnion centerline.

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Rotary to Reciprocating Motion Converter

This device converts relatively high-speed rotary motion to low-speed reciprocating motion. Shaft 12 constantly rotates in a given direction to drive yoke 14 axially of such shaft. Surrounding shaft 12 is a ring of balls 16. On two opposing sides are ball races 18 which retain balls 16 and surround a portion, about 90 degrees, of shaft 12. Ball races 18 are carried in trunnions 22 whose axes intersect the axis of shaft 12 and are perpendicular to it. Ball races 18 are free to rotate in trunnions 22. Control arms 24 are moved by cam 26 on control shaft 28. The latter is arranged with its axis perpendicular to both shaft 12 and the trunnion centerline.

When shaft 28 is rotated, it rotates each ball race 18 the same mount but in an opposite direction. In order to get balls 16 from one race to the other, there are two ball retainers 32 that are loosely attached to the end of the races 18 so balls 16 are always led to the other race. Both races 18 are held in tight contact with shaft 12 by springs 32 and 34. Yoke 14 is constrained so that it can move only in the direction of the axis of shaft 12.

In operation with ball races 18 in the neutral position, the complete unit acts as a ball bearing. When ball races 18 are rotated, the frictional forces between balls 16 and shaft 12 and balls 16 and races 18 produce a force in the direction of the axis of shaft 12. Shaft 28 can be operated electrically or mechanically.

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