| 摘要 |
The invention relates to improvements in a four cycle valve-in-head internal combustion engine, the combustion chamber of which has at least one inlet and one outlet valve each of these valves having plate surfaces which are located at least substantially within the geometric cylindrical surface defined by the piston of the engine. On the one hand, the plate of the outlet valve is positioned in a zone spaced only slightly from the piston when it is the top-dead center position and thereby forms a compression surface area for portions of the charge to be compressed. On the other hand, the plate of the inlet valve is disposed in a portion of the cylinder head which defines the primary clearance volume of the combustion chamber together with the opposed piston top. The cylinder head area for the inlet valve plate includes a depression area to provide for a vortex flow of the compression charge and the arrangement in this area is such that the rotary axis of the vortex flow extends substantially parallel to the longitudinal axis of the inlet valve. Also, the maximum depth of the depression is smaller than the smallest diameter of the opening of the depression oriented toward the piston top or the cylinder head.
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