Hydraulically operating actuating device for a lift valve
US4930464A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Sep 27, 1989 |
| Grant date | Jun 5, 1990 |
| Priority date | — |
| Expiry date | Sep 27, 2009 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF01L9/10
- WIPO fieldEngines, pumps, turbines
- WIPO sectorMechanical engineering
Abstract
A hydraulically operating actuating device for a lift valve, in particular in an internal combustion engine, has a piston which is connected to the valve stem. The piston is positioned in a cylinder and separates two stroke spaces which are connectable, in each case via inlet and outlet openings which can be occluded by the piston, to a pump for the working fluid or a reservoir. In order to reduce the energy requirement of the actuating device, the two inlet openings, which in a central actuation range of the piston are open, are connected to one another directly by a line, and two springs which act in opposite directions and, in equilibrium, hold the piston in a central position relative to two end positions engage on the piston or valve stem.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.