Variable valve timing mechanism

Details Variable valve timing mechanism Variable valve timing mechanism

1998-08-05

2000-02-01

Lo, Weilun

Internal-combustion engines

Poppet valve operating mechanism

With means for varying timing

123 9017, F01L 1300

Patent

active

060190760

ABSTRACT:
Variable valve timing (VVT) mechanisms are disclosed which are relatively compact and are applicable for operating individual or multiple valves. In an exemplary embodiment, dual engine valves are driven by an oscillatable rocker cam that is actuated by a linkage driven by 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 is carried on a camshaft and the oscillatable rocker cam is pivoted on the rotational axis of the rotary cam. A control shaft connects with the control member through an angled slider and slot connection that provides a variable angular ratio for improved charge control at low valve lifts. A worm gear actuator may be applied to drive the control shaft. The tooth angles is selected to prevent back driving of the worm drive motor by varying cam torques on the control member so that a smaller drive motor may be used. Other alternative arrangements are disclosed.

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patent: 5899180 (1999-05-01), Fischer
patent: 5937809 (1999-08-01), Pierik et al.

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