Importance

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Abstract

An intake and exhaust valve system (10) for an internal combustion engine having a combustion chamber (19) within a cylinder (13) closed at one end by a cylinder head (17). A cavity (25) is provided in the cylinder head opening onto the combustion chamber through a first port (27). The valve system (10) has first and second valves one of which is an intake valve (31) movable between open and closed conditions for controlling intake fluid flow into the combustion chamber (19) and the other of which is an exhaust valve (33) movable between open and closed conditions for controlling exhaust gas flow from the combustion chamber. The first valve (31) comprises a valve head (35) sealingly engagable with the first port (27) and a skirt structure (31). The skirt structure (37) is in sliding and sealing engagement with a tubular wall structure (49) within the cavity (25) whereby the skirt structure and wall structures cooperate to divide the cavity (25) into an inner cavity section (51) and an outer cavity section (53) surrounding the inner cavity section. A first flow passage (26) communicates with the outer cavity section (53) and a second flow passage (28) communicating with the inner cavity section (51). The second valve (33) is disposed in the first valve (31) for opening and closing a second port (61) in the first valve (31) for controlling fluid flow between the combustion chamber (19) and inner cavity section (51) wherein the skirt structure (37) has a first axial length and the tubular wall structure (49) has a second axial length with the first axial length being less than the second axial length. This arrangement provides a concentric intake and exhaust valve system with reduced reciprocating mass.

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First Claim