Plural lash engine valve gear and device for selecting same
US4221199A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jun 13, 1977 |
| Grant date | Sep 9, 1980 |
| Priority date | — |
| Expiry date | Jun 13, 1997 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF01L2820/031
- WIPO fieldEngines, pumps, turbines
- WIPO sectorMechanical engineering
Abstract
A means for selecting one of a plurality of predetermined amounts of the lost-motion lash in the valve gear of an engine while the engine is running. A latchable mechanism in the valve gear is movable from a first position providing predetermined normal low level lash to a second position providing a predetermined substantially greater lash for reducing the effective lift of the cam and shortening of the valve event. A unique cam profile provides a period of linear lift of substantially constant low velocity, both during lash take-up on valve opening to prevent high velocity clash of valve gear components and during valve closing to prevent high velocity seating of the valve.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.