Patent ID: 8307791
Filing Date: 2012-11-13
Classification: F01P

Abstract:
1. A four-cycle air-oil cooled engine, comprising: a cylinder head having a spark plug mounting hole formed therein and a groove formed therein surrounding a portion of the spark plug mounting hole; said spark plug mounting hole adapted to receive a tip portion of a spark plug therein; a cover member operatively attached to said cylinder head and surrounding a portion of said spark plug mounting hole and arranged to cover an opening end of the groove, thereby defining an oil jacket around a periphery of the spark plug mounting hole; and a gasket disposed between said cylinder head and said cover member; wherein the cylinder head is formed with first and second co-planar sealing surfaces which are disposed along a plane perpendicular to an axis of the spark plug mounting hole, wherein the opening end of the groove is disposed between the first flat sealing surface and the second flat sealing surface; and wherein said cover member, having a flat surface opposed to the first and second sealing surfaces, is secured to the cylinder head such that said gasket is interposed between the first and second sealing surfaces and the flat surface of the cover member.