| 摘要 |
PROBLEM TO BE SOLVED: To materialize cost reduction, miniaturization and weight reduction of an intake valve gear and an exhaust valve gear. SOLUTION: A liner part 52a having a movable sleeve 43 movably fitted therein is provided on an engine case 41 on an extension of a fixed piston 61A. A suction chamber 90 is formed out of a liner part 52a and a top part 43b of the movable sleeve 43. An intake hole 43e connecting the intake chamber 90 with a combustion chamber 48 is provided on the top part 43b. An intake valve mechanism 47 opening and closing the intake hole 43e is provided on the top part 47b. The intake valve mechanism 47 includes a valve support part 43d of the top part 43b, a rocker shaft 83 provided on the valve support part 43d, a rocker arm 86 attached to the rocker shaft 83 at a middle part in such a manner that the same can freely swing, and an intake valve 82 connected to the rocker arm 86 at one end. The intake valve 82 is opened when pressure in the intake chamber 90 is higher than pressure in the combustion chamber 48, and is closed when pressure in the combustion chamber 48 is higher than pressure in the intake chamber 90. COPYRIGHT: (C)2009,JPO&INPIT
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