| 摘要 |
<P>PROBLEM TO BE SOLVED: To solve a problem that there needs to secure uniformity of gas hitting to an exhaust gas cleaning catalyst when intending to make a cylinder head small, on the other hand sealing property can not be held in assembling with an exhaust pipe when intending to enlarge an exhaust outlet of the cylinder head for uniforming the gas hitting to the exhaust gas cleaning catalyst. <P>SOLUTION: A cylinder head structure in which a gathering part of exhaust ports from a plurality of cylinders is arranged in an outer shell, the catalyst is coupled to the downstream side of the exhaust outlet, a cone part curved at a substantially right angle is fastened to the vicinity of the exhaust outlet with a bolt is characterized in that the shape of the exhaust outlet is formed in an ellipse long in a longitudinal direction when a crankshaft direction is the longitudinal direction, a curvature radius in an upper side above the longest diameter in the longitudinal direction is made smaller than the curvature radius of the lower side in ellipse, the ellipse is located inside more than a line connecting fastening points. <P>COPYRIGHT: (C)2013,JPO&INPIT |
