Worm driving a servo actuator with spring return and rotary valve employing same
US6276664A · kind A · utility
19Cited by
9References
12Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Nov 19, 1999 |
| Grant date | Aug 21, 2001 |
| Priority date | — |
| Expiry date | Nov 19, 2019 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF02D2009/0269
- WIPO fieldEngines, pumps, turbines
- WIPO sectorMechanical engineering
Abstract
A motorized servo actuator has an output shaft rotated by a sector gear driven by a worm. The worm has a co-axially disposed torsion spring which is wound as the worm rotates. The worm is driven by a motor and gear train. In the event of motor failure during rotation of the sector gear in a given direction from an initial position, the wound torsion spring has sufficient stored energy to rotate the worm to return the sector gear to the initial position.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.