Variable valve timing system in an engine having a rotating cam-shaft
US5080052A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Mar 25, 1991 |
| Grant date | Jan 14, 1992 |
| Priority date | — |
| Expiry date | Mar 25, 2011 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF01L1/34406
- WIPO fieldEngines, pumps, turbines
- WIPO sectorMechanical engineering
Abstract
A variable valve timing system includes 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, and 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. The damper device includes the first timing member, a ring-member engaged with the second timing member and a viscous fluid between the first timing member and the ring-member.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.