Hydraulic-mechanical valve operating mechanism

Details Hydraulic-mechanical valve operating mechanism Hydraulic-mechanical valve operating mechanism

1996-11-18

1997-10-07

Lo, Weilun

Internal-combustion engines

Poppet valve operating mechanism

Hydraulic system

123 9015, F01L 902

Patent

active

056736584

ABSTRACT:
In a hydraulic-mechanical operating mechanism for a breathing valve of an internal combustion engine in which the valve is engaged by two compression springs, one biasing the valve in opening direction and the other biasing the valve in a closing direction, the valve has a stem with first and second cam areas for engagement by the pistons of first and second cylinder and piston structures for retaining the valve in its closed and open end positions wherein the first cylinder and piston structure includes spring means biasing its piston into engagement with the associated cam area and the second cylinder and piston structures includes spring means biasing the associated piston away from the associated cam area and the respective cylinders can be hydraulically actuated to release the valve when it is in the closed end position and to engage the valve when it is in its open end position.

REFERENCES:
patent: 5058538 (1991-10-01), Erickson et al.
patent: 5193495 (1993-03-01), Wood, III
patent: 5259345 (1993-11-01), Richeson
patent: 5345904 (1994-09-01), Dopson et al.
patent: 5555861 (1996-09-01), Mayr et al.
patent: 5558052 (1996-09-01), Schwarzenthal et al.

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