Variable valve timing system in an engine having a rotating cam-shaft
US5090365A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Mar 15, 1991 |
| Grant date | Feb 25, 1992 |
| Priority date | — |
| Expiry date | Mar 15, 2011 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF01L2810/04
- WIPO fieldEngines, pumps, turbines
- WIPO sectorMechanical engineering
Abstract
A variable valve timing system comprises a first timing member driven by the engine, a second timing member rotatably fixed to the crankshaft, a helical device engaged between the first and second timing members and including a piston movable for adjusting an angular position between the first and second timing members, a hydraulic circuit device for selectively applying a hydraulic pressure to the piston for selectively moving the piston to adjust the angular position, a damper device on the first and second timing members for hydraulically damping rotational vibrations between the first timing member and the second timing member, and a notch formed at least on one of the first timing member and the second timing member in the damper device. Torque variations applied to the second timing member relative so the first timing member do not cause a change in the angular position.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.