Electromechanical actuator of the type having a screw-and-nut system
US6237433A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | May 12, 1999 |
| Grant date | May 29, 2001 |
| Priority date | — |
| Expiry date | May 12, 2019 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T403/32426
- WIPO fieldMechanical elements
- WIPO sectorMechanical engineering
Abstract
An electromechanical actuator comprising a screw that is driven in rotation, a nut that is driven in translation by rotation of the screw, and a guide rod which is driven in translation by the nut, the actuator having a plurality of rollers interposed between the guide rod and the nut, said rollers having a succession of annular grooves and ridges, while the outside surface of the nut and the inside surface of the guide rod have respective pluralities of complementary grooves and ridges, the grooves and ridges of the rollers co-operating with the grooves and ridges of the nut and of the guide rod to transmit axial force on the guide rod to the nut when said rollers are in an engaged position, the nut and/or the guide rod having release channels in angular positions that are designed to coincide with the positions of the rollers when they are declutched, said channels being such that they enable at least some of the grooves and ridges to be disengaged so as to release the guide rod to move in translation relative to the nut, the actuator including means enabling said rollers to be moved from their clutched position to their declutched position.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.