Plural lash engine valve gear and device for selecting same

Details Plural lash engine valve gear and device for selecting same Plural lash engine valve gear and device for selecting same

1977-06-13

1980-09-09

Lazarus, Ira S.

Internal-combustion engines

Poppet valve operating mechanism

With means for varying timing

123 9043, 123198F, F02D 1306

Patent

active

042211999

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.

REFERENCES:
patent: 2934052 (1960-04-01), Longenecker
patent: 2997991 (1961-08-01), Roan
patent: 3166057 (1965-01-01), Konrad et al.
patent: 3277874 (1966-10-01), Wagner
patent: 3413965 (1968-12-01), Gauasso
patent: 3422803 (1969-01-01), Stivender
patent: 3786792 (1974-01-01), Pelizzoni et al.
patent: 3964455 (1976-06-01), Brown

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