Lost motion actuator

Details Lost motion actuator Lost motion actuator

1992-04-02

1992-10-27

Cross, E. Rollins

Internal-combustion engines

Poppet valve operating mechanism

With means for varying timing

123 9012, 123 9049, F01L 134, F01L 116

Patent

active

051580489

ABSTRACT:
A damping mechanism for a lost motion hydraulic actuator utilizes a thin edge orifice in cooperation with a communication passageway between the upper and lower chambers controls the damping of the upper piston on closure. The upper piston is operatively connected to the engine valve of an internal combustion engine. A communication port from the upper chamber to the communication passageway is closed off as the upper piston returns to its normal position forcing the flow of the hydraulic fluid through the thin edge orifice. In this manner the viscosity of the hydraulic fluid does not control the damping of the actuator and the noise factor is substantially reduced.

REFERENCES:
patent: 4223648 (1980-09-01), Pozniak et al.
patent: 4671221 (1987-06-01), Geringer et al.
patent: 4892067 (1990-01-01), Paul et al.
patent: 4919089 (1990-04-01), Fujiyoshi et al.
patent: 4977867 (1990-12-01), Rhoads
patent: 5088458 (1992-02-01), Wakeman et al.
patent: 5103779 (1992-04-01), Hare, Sr.
patent: 5113811 (1992-05-01), Rembold et al.

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