Rotary hydraulic valve control of an electrohydraulic camless valvetrain
US5456221A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Jan 6, 1995 |
| Grant date | Oct 10, 1995 |
| Priority date | — |
| Expiry date | Jan 6, 2015 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF01L9/10
- WIPO fieldEngines, pumps, turbines
- WIPO sectorMechanical engineering
Abstract
An engine valve assembly (10) within an electrohydraulic camless valvetrain cooperates with a hydraulic system (8) having a low pressure branch (70) and a high pressure branch (68) to selectively open and close engine valve (12). Engine valve (12) is affixed to a valve piston (16) within a piston chamber (18). A volume (42) below piston (16) is connected to high pressure branch (68) and a volume (20) above piston (16) is selectively connected to the high pressure branch (68) or the low pressure branch (70) via a rotary valve (34), to effect engine valve opening and closing. A motor (60) effects the rotation of the rotary valve (34).
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.