Variable valve timing system
US5377639A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jan 28, 1994 |
| Grant date | Jan 3, 1995 |
| Priority date | — |
| Expiry date | Jan 28, 2014 |
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 in an engine having a rotating cam-shaft includes an input pulley driven by the engine, a piston engaged with the input pulley so as to be displaceable in angular direction relative thereto, a cup-shaped casing mounted on the piston so as to be displaceable in angular direction relative thereto and connected to the cam-shaft, a cup-shaped cover accommodating therein the cup-shaped casing with a clearance and connected to the input pulley, a damper containing an amount of viscous fluid disposed in the clearance, a first sealing member disposed at one end of the clearnace, and a second sealing member disposed at the other end of the clearance, and having a characteristic in that a fluid-tight function between the cup-shaped cover and the cup-shaped casing becomes less as a centrifugal force increases.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.