Variable action arrangement for a lift valve

Details Variable action arrangement for a lift valve Variable action arrangement for a lift valve

1992-01-24

1993-03-16

Cross, E. Rollins

Internal-combustion engines

Poppet valve operating mechanism

With means for varying timing

123 9048, F01L 112, F01L 124

Patent

active

051934965

ABSTRACT:
A force-transmitting arrangement to effect opening of a lift valve includes a central plunger responsive to the action of a main cam and a valve-engaging piston enclosing a pressure chamber. In addition, another pressure chamber surrounding the plunger and within a displaceable cup plunger communicates with a pressure medium line having a control valve. The cup plunger is responsive to an additional cam having a different lift curve from the main cam. When the control valve is closed, the lift curve of the additional cam is transmitted to the lift valve by way of both pressure chambers. When the control valve is open, the lift curve of the main cam is transmitted to the lift valve.

REFERENCES:
patent: 4905639 (1990-03-01), Konno
patent: 5036807 (1991-08-01), Kaneko
patent: 5090364 (1992-02-01), McCarroll et al.

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