Patent ID: 7481190

Claim:
A disc valve assembly for a split-cycle engine, the disc valve assembly comprising: a generally circular air inlet having a central axis; an axially flexible washer-shaped annular ring having a generally central opening, the annular ring being adjacent said air inlet and forming a washer valve for opening and closing said air inlet; a generally circular outer valve seat adjacent said air inlet; a housing including a sleeve having an open end, a flow channel through said sleeve, and a control chamber; a disc valve member including a stem portion received in said sleeve through said sleeve open end and a piston portion connected to the stem portion, the piston portion having a sloped outer sidewall biased into engagement with said outer valve seat and a generally central opening defined by a sloped inner sidewall that forms an inner valve seat concentric with the central opening in said washer valve; and an unloading valve member disposed in said housing, the unloading valve member including a piston disposed in said control chamber, a stem extending from the piston through said control chamber and into said flow channel, and a disc-shaped valve portion connected to the stem opposite the piston, the disc-shaped valve portion having a sloped outer surface cooperable with said inner valve seat; said unloading valve member being biased into engagement with said inner valve seat.