Internal combustion engine camshaft phaseshift control system
US5117784A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | May 3, 1991 |
| Grant date | Jun 2, 1992 |
| Priority date | — |
| Expiry date | May 3, 2011 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF01L1/34409
- WIPO fieldEngines, pumps, turbines
- WIPO sectorMechanical engineering
Abstract
A modular control mechanism for shifting the phase or angular position of a camshaft or camshafts relative to a crankshaft in an internal combustion engine, and utilizing the energy produced by the reaction torque pulses on the camshaft, and resultant pressure pulses in the cavities, to provide a self-actuating system. In one embodiment, e.g. for controlling a single camshaft, the mechanism comprises two hydraulic cylindrical housings attached to either the camshaft flange or the camshaft driving sprocket, and a respective piston within each cylindrical housing and attached to the other flange to form a rotational hydraulic coupling. The hydraulic cylinders provide a pair of fluid chambers varying in displacement as the two flanges are rotated relative to one another. A hydraulic control apparatus regulates the flow of fluid between the hydraulic cylinders, thus controlling the phase shift between the crankshaft and camshaft. In another embodiment, the two hydraulic cylindrical housings are replaced with a single housing including a double acting piston. The control mechanism of the foregoing embodiments being limited to controlling a single camshaft and utilizing a dual planetary …
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.