Valve operating device for internal combustion engine
US4889085A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Nov 18, 1988 |
| Grant date | Dec 26, 1989 |
| Priority date | — |
| Expiry date | Nov 18, 2008 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF01L9/14
- WIPO fieldEngines, pumps, turbines
- WIPO sectorMechanical engineering
Abstract
A valve operating device for an internal combustion engine that includes a valve piston having one end facing into a damper chamber and the other end operatively coupled to an intake or exhaust valve which is spring-biased in a closing direction. A cam piston has one end operatively coupled to a cam drivable by a crankshaft and the other end disposed in a working oil chamber. A restriction mechanism uniformly restricts oil flow during final valve closing operation of the intake or exhaust valve until the valve is fully closed. The working oil chamber and damper chamber are held in communication with each other through the restriction mechanism. A bypass passage interconnects the damper chamber and the working oil chamber in bypassing relation to the restriction mechanism. A variable restriction mechanism is provided in the bypass passage capable of varying the area for oil flow according to valve closing characteristics required by the viscosity of working oil and operating conditions of the engine.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.