Ball screw rotary actuator
US4945779A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Dec 22, 1987 |
| Grant date | Aug 7, 1990 |
| Priority date | — |
| Expiry date | Dec 22, 2007 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T74/18888
- WIPO fieldMechanical elements
- WIPO sectorMechanical engineering
Abstract
A linear to rotary ball screw actuator which includes both helical grooves and straight grooves longitudinally spaced apart on the outer surface of the shaft. Matching helical grooves and straight grooves are formed on opposed inner surfaces of first and second portions of relatively moveable housing to provide passageways filled with balls. A return passageway is provided through the housing by way of a straight bore parallel to the longitudinal axis of the shaft. Also disclosed is a ball screw rotary actuator of the type above described but having an additional section including either straight or helical grooves thereby to define an actuator having either a central helically grooved portion sandwiched between straight grooved portions or alternatively a central straight grooved portion with helical grooved portions on either side thereof.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.