Device for varying engine valve timing
US4754727A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Jul 13, 1987 |
| Grant date | Jul 5, 1988 |
| Priority date | — |
| Expiry date | Jul 13, 2007 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF01L1/34406
- WIPO fieldEngines, pumps, turbines
- WIPO sectorMechanical engineering
Abstract
A device for angularly displacing a camshaft relative to the crankshaft of an internal combustion engine to vary engine valve timing. The device comprises a hub fixed to the camshaft, an annular means threadedly engaged with the hub or with an advancing member mounted on the outer surface of the annular means. Angled lugs formed on a drive member coact with angled slots formed on the outer periphery of the advancing member. The amount of angular displacement of the drive member relative to the hub and camshaft is directly proportional to the axial displacement of the advancing member which in turn is moved axially as the annular means is moved axially along the threads on the hub or on the advancing member. The latter movement is effected by applying a retarding or braking torque to the annular means.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.