Variable valve timing mechanisms

Details Variable valve timing mechanisms Variable valve timing mechanisms

1998-03-03

1999-08-17

Lo, Weilun

Internal-combustion engines

Poppet valve operating mechanism

With means for varying timing

123 9017, F01L 1300

Patent

active

059378093

ABSTRACT:
Crank rocker variable valve timing (VVT) mechanisms are disclosed which are relatively compact and are applicable for operating individual or multiple valves. In an exemplary embodiment, an engine valve is driven by an oscillatable rocker cam that is actuated by a linkage driven by a rotary eccentric, preferably a rotary cam. The linkage is pivoted on a control member that is in turn pivotable about the axis of the rotary cam and angularly adjustable to vary the orientation of the rocker cam and thereby vary the valve lift and timing. The rotary cam may be carried on a camshaft. The oscillatable cam is pivoted on the rotational axis of the rotary cam. For some applications the rotary cam and follower could be replaced by a crank or eccentric driving a rocker arm. Numerous other variations in the arrangements are also possible.

REFERENCES:
patent: 4261307 (1981-04-01), Oldberg
patent: 4572118 (1986-02-01), Baguena
patent: 4580533 (1986-04-01), Oda et al.
patent: 5107802 (1992-04-01), Yagi et al.
patent: 5189998 (1993-03-01), Hara
patent: 5205247 (1993-04-01), Hoffman
patent: 5253620 (1993-10-01), Dohn et al.
patent: 5501186 (1996-03-01), Yamada et al.
patent: 5732669 (1998-03-01), Fischer et al.
patent: 5787849 (1998-08-01), Mitchell

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