Closed-system electrohydraulic actuator
US7051526B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Oct 1, 2004 |
| Grant date | May 30, 2006 |
| Priority date | — |
| Expiry date | Oct 16, 2024 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF16D2048/0203
- WIPO fieldMechanical elements
- WIPO sectorMechanical engineering
Abstract
An electrohydraulic actuator (10) includes a fluid-powered actuator (11) having a piston (15) in a cylinder (16). The piston divides the cylinder into two opposed chambers (18, 19). The actuator includes a fixed-displacement reversible motor-driven pump (13) having a first port communicating with one of the chambers and having a second port communicating with the other of the chambers in a closed hydraulic system. A pre-charged accumulator (14) communicates with the pump first port. One of the actuator chambers is maintained at a fixed pre-charged pressure of the accumulator, and the operation of the pump controls the pressure in, and volume of, the other chamber.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.