Temperature compensated damping mechanism for hydraulic engine v

Details Temperature compensated damping mechanism for hydraulic engine v Temperature compensated damping mechanism for hydraulic engine v

1992-03-26

1992-12-08

Cross, E. Rollins

Internal-combustion engines

Poppet valve operating mechanism

With temperature compensation

123 9055, 74569, F01L 114

Patent

active

051688409

ABSTRACT:
A hydraulic engine valve actuator utilizes a highly thermally expandable material in the damping piston to control the damping of the piston when the engine valve is closing. The expandable material is retained in the upper piston and as the temperature of the hydraulic fluid increases, the material expands to extend a plunger into a passageway to restrict the flow of hydraulic fluid from one chamber to the other. In the preferred embodiment the thermally expandable material is paraffin wax. The extent of the extension of the plunger is approximately 4.0 mm.

REFERENCES:
patent: 2870757 (1959-01-01), Dayton
patent: 3262434 (1966-07-01), Kuchen et al.
patent: 4231267 (1980-11-01), Van Slooten
patent: 4535734 (1985-08-01), Kodama et al.
patent: 4881499 (1989-11-01), Dietrich et al.
patent: 5088458 (1992-02-01), Wakeman et al.
patent: 5107806 (1992-04-01), Dohring et al.

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