Hydraulic actuator for a servomotor with an end lock function
US7624671B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Feb 7, 2007 |
| Grant date | Dec 1, 2009 |
| Priority date | — |
| Expiry date | Jul 1, 2027 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF16H61/433
- WIPO fieldMechanical elements
- WIPO sectorMechanical engineering
Abstract
A hydraulic actuator for a hydraulic servomotor (4) is disclosed. The hydraulic servomotor (4) is of a kind having at least one defined end position, and has a first chamber (5) and a second chamber (6) associated therewith. The actuator is connected to a fluid source (2) and a fluid drain (3). The actuator comprises a first valve (7) fluidly connected between the fluid source (2) and the first chamber (5), a second valve (8) fluidly connected between the first chamber (5) and the fluid drain (3), and a third valve (9) fluidly connected between the fluid source (2) and the second chamber (6). The actuator further comprises a flow channel (10, 17), preferably comprising a flow restrictor (12, 18), in fluid communication with the second chamber (6).The valves (7, 8, 9) are such that, in the case of a power cut off, they will prevent a fluid flow out of the first chamber (5), and a fluid flow out of the second chamber (6) takes place via the flow channel (10, 17). This will cause a servomotor piston member (13) to move towards the second chamber (6), thereby moving the hydraulic servomotor (4) to an end position.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.