Valve timing phase changer

Details Valve timing phase changer Valve timing phase changer

1996-11-18

1998-08-04

Lo, Weilun

Internal-combustion engines

Poppet valve operating mechanism

With means for varying timing

123 9016, 123 9023, 123 9027, 123 9031, 1231935, F01L 134, F01L 126, F01L 1300

Patent

active

057878498

ABSTRACT:
A variable phase valve timing assembly for an internal combustion engine. A camshaft driven by a rotating crankshaft of the invention actuates an intermediate member such as a pivotally mounted lever a bucket tappet a first portion of which bears against a cam supported by the camshaft and a second portion of which bears against a valve of the engine such that rotation of the camshaft displaces the intermediate member and valve in a cyclical manner. The camshaft is displaceable relative to the intermediate member along a predetermined path, and means are provided for displacing the camshaft in dependence upon a control input, for example engine speed. The geometry of the predetermined path and of the first portion of the intermediate member are such that movement of the camshaft alters the phase of displacements of the valve relative to rotation of the engine.

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patent: 5398649 (1995-03-01), Shimamoto
patent: 5617818 (1997-04-01), Luders

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