Importance

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Abstract

An internal combustion engine having intake and exhaust manifolds and a cylinder defining a combustion chamber in which a piston reciprocates and having a wall formed with a port has a combined poppet/slide valve. This valve has a lift valve having a head sealingly engageable in the port and movable in a predetermined direction between a raised position permitting flow past the head through the port and a closed position blocking flow through the port and a stem extending from the head in the direction and having an outer tappet end. It also has a sleeve centered on and rotatable about an axis generally perpendicular to the direction and formed with a radially contoured cam radially engaging the tappet end of the stem so that rotation of the sleeve about its axis displaces the valve between its positions. The sleeve is formed with a pair of axially offset and radially throughgoing apertures. A seat surface complementarily fitted to the sleeve is formed with a pair of axially offset apertures alignable with the apertures of the sleeve in respective angularly offset positions of the sleeve. The apertures of at least one of the pairs are angularly offset relative to each other with respect to the axis. A conduit extends between the port of the combustion chamber and the apertures of the seat surface. Structure inside the sleeve connects one of the apertures to the intake manifold and for connecting the other aperture to the exhaust manifold.

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First Claim