Balancing valve motion in an electrohydraulic camless valvetrain
US5572961A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Apr 5, 1995 |
| Grant date | Nov 12, 1996 |
| Priority date | — |
| Expiry date | Apr 5, 2015 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF01L9/10
- WIPO fieldEngines, pumps, turbines
- WIPO sectorMechanical engineering
Abstract
A electrohydraulic engine valve control system in a multi-valve engine wherein multiple intake (or exhaust) valves (10) in each cylinder are hydraulically controlled by a set of hydraulic valves (64, 68). Each engine valve (10) includes a valve piston (26) subjected to fluid pressure acting on surfaces at both ends with the volume (27) at one end connected to a source of high pressure fluid (40) while a volume (25) at the other end is selectively connected to a source of high pressure fluid (40) and a source of low pressure fluid (42), and disconnected from each through action of the hydraulic valves (64, 68). Each group of corresponding engine valves (10) is linked hydraulically together and can be moved in unison. Balancing springs (80) operatively engaging each valve piston (26), to account for manufacturing tolerances and other factors, by balancing the motion of the engine valves (10) while opening and closing.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.