Lost motion actuator with damping transition

Details Lost motion actuator with damping transition Lost motion actuator with damping transition

1995-01-11

1996-01-23

Yuen, Henry C.

Internal-combustion engines

Poppet valve operating mechanism

Hydraulic system

123 9016, 123 9049, F01L 116

Patent

active

054858135

ABSTRACT:
A lost motion hydraulic actuator for use between a cam and a valve of an internal combustion engine is provided with internal communication ports that are controlled by a piston to provide sequential closing of the ports during closing of the engine valve to reduce hydraulic shock and hammering noise as fluid is gradually directed exclusively through a damping orifice during valve seating.

REFERENCES:
patent: 4615306 (1986-10-01), Wakeman
patent: 4889085 (1989-12-01), Yagi et al.
patent: 5088458 (1992-02-01), Wakeman et al.
patent: 5158048 (1992-10-01), Robnett et al.
patent: 5216988 (1993-06-01), Taxon
patent: 5233951 (1993-08-01), Hausknecht
patent: 5255639 (1993-10-01), Shirey et al.
patent: 5275136 (1994-01-01), Schechter et al.

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