| 摘要 |
<P>PROBLEM TO BE SOLVED: To achieve reduction in size and weight of a cylinder head in a four-cycle engine having a connection surface formed on the cylinder head to connect a head cover set so as to follow along a plane that is inclined so as to be spaced further away from a cylinder block toward a first sidewall having an intake port from a second sidewall having an exhaust port. Ž<P>SOLUTION: In a cylinder head structure, a camshaft holder 64 having a semicircular bearing portion and integrally extended to the first sidewall 19a is integrally formed on the cylinder head 19 so as to protrude from the connection surface 63 as viewed from an axial direction of a camshaft 54. The intake port 38 is disposed in the first sidewall 19a such that an upstream end thereof is disposed at the same position as a part of the bearing portion in a direction along an axis of a cylinder bore. A stem end 43a of an exhaust valve 41 is disposed at a position protruding from the connection surface 63 as viewed in a direction along an axis of the camshaft 54. Ž<P>COPYRIGHT: (C)2010,JPO&INPIT Ž
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