| 摘要 |
PURPOSE:To carry out favorable combustion over all load zones by making part of exhaust gas re-enter a combustion chamber while swirling around a cylinder axis and forming a squash area in between a cylinder wall face and the top of a piston. CONSTITUTION:New air ports 20 and exhaust ports 22 are oppositely provided on a cylinder head 14 and new air valves 24 and exhaust valves 26 are provided to these ports respectively. In this case, the exhaust port 22 on which one Es of the exhaust valves 26 is provided is formed at a right angle to the longitudi nal axis of an engine so as to form a straight line with the branch pipe 50a of an exhaust manifold while being opened in the tangential direction with respect to a combustion chamber 18. Thereby, a swirl S is formed around a cylinder axis by a re-entered exhaust gas. On the other hand, squash areas 58a are formed in between the inner wall of the cylinder head 14, i.e., the upper wall of the combustion chamber and a piston. Thereby, stratification can be properly disturbed while properly mixing a small quantity of remaining exhaust gas with new air.
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