Hydraulic valve lifter having function to stop valve drive

Details Hydraulic valve lifter having function to stop valve drive Hydraulic valve lifter having function to stop valve drive

1992-03-27

1992-11-17

Cross, E. Rollins

Internal-combustion engines

Poppet valve operating mechanism

With means for varying timing

126198F, 126321, F01L 134, F02D 1306

Patent

active

051633892

ABSTRACT:
A hydraulic valve lifter having function to stop valve drive comprises a cylinder, a lifter body sliding in the cylinder, a cam driving the lifter body, a tappet sliding in the lifter body, a valve driven by the tappet, a plunger located between the lifter body and the tappet, a reservoir formed in the lifter body and being in fluid communication with a hydraulic source always, a first pressure room formed in the tappet and separated from the reservoir via the plunger, a check valve controlling a communication between the reservoir and the first pressure room, a piston sliding in the lifter body and having a rod driving the check valve, a second pressure room located at one side of the piston and being in fluid communication with the hydraulic source via a control valve, a room located at the other side of the piston, and a passage decreasing a pressure in the room.

REFERENCES:
patent: 3786792 (1974-01-01), Pelizzoni et al.
patent: 4337739 (1982-07-01), Jordan
patent: 4469061 (1984-09-01), Ajiki et al.
patent: 4475497 (1984-10-01), Honda et al.
patent: 4509467 (1985-04-01), Arai et al.
patent: 4522169 (1985-06-01), Arai et al.
patent: 4546734 (1985-10-01), Kodama
patent: 4770137 (1988-09-01), Okabe et al.

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