Hydraulic actuator and variable valve driving mechanism making use of the same
US5809955A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Apr 10, 1997 |
| Grant date | Sep 22, 1998 |
| Priority date | — |
| Expiry date | Apr 10, 2017 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF01L1/356
- WIPO fieldEngines, pumps, turbines
- WIPO sectorMechanical engineering
Abstract
A hydraulic actuator is provided with a housing with an oil compartment formed therein; a power output shaft rotatably supported on the housing and extending out from an interior of the oil compartment to an exterior of the housing; a vane radially extending out from the power output shaft and maintained in contact with an inner wall of the oil compartment, whereby the vane divides the oil compartment into a first oil compartment and a second oil compartment; a first hydraulic pressure passage communicating the first oil compartment and a hydraulic pressure source with each other; a second hydraulic pressure passage communicating the second oil compartment and the hydraulic pressure source with each other; and an oil control valve regulating at least one of a first hydraulic pressure to be supplied to the first oil compartment through the first hydraulic pressure passage and a second hydraulic pressure to be supplied to the second oil compartment through the second hydraulic pressure passage. The power output shaft is specified in its rotated position by the first and second hydraulic pressures acting on the vane. A variable valve driving mechanism making use of the hydraulic actua…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.