Apparatus for deactivating an engine valve

Internal-combustion engines – Poppet valve operating mechanism – With means for varying timing

Reexamination Certificate

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Details

C123S090150, C123S090120

Reexamination Certificate

active

06883477

ABSTRACT:
An apparatus for deactivating an engine valve has an accumulator sleeve slidably retained in an engine block and biased toward a lower chamber in fluid communication with an interior of the sleeve. A follower piston slides in the sleeve in contact with a lobe of a can. An upper piston slides in an upper chamber in contact with a pushrod. A fluid passage connects the lower chamber and the upper chamber. A normally open spool valve in the fluid passage includes a control spool for opening and closing the passage. Another passage connects the lower chamber and one end of the control spool. A spring chamber provides fluid to an opposite end of the control spool through a control valve from a source of pressurized fluid.

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patent: 35 37 630 (1986-04-01), None
patent: 42 02 507 (1992-08-01), None

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