Four-cycle air-oil cooled engine, and vehicle incorporating same
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United States of America Patent
Stats
-
Nov 13, 2012
Grant Date -
Mar 18, 2010
app pub date -
Sep 9, 2009
filing date -
Sep 17, 2008
priority date (Note) -
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status (Latency Note)
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Abstract
A four-cycle air-oil cooled engine includes a cylinder head having a spark plug mounting hole formed therein, and a ring-like groove formed therein and surrounding the spark plug mounting hole. The cylinder head is formed with first and second co-planar sealing surfaces, disposed on a plane perpendicular to an axis of the spark plug mounting hole, and having an opening end of the ring-like groove disposed therebetween. The ring-like groove defines an oil jacket around the periphery of the spark plug mounting hole. A cover member having a flat surface opposed to the first and second flat sealing surfaces of the cylinder head is secured to the cylinder head such that a single gasket is interposed between the first and second sealing surfaces and the flat surface of the cover member.
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