Patent ID: 9080531
Filing Date: 2015-07-14
Classification: F01L,F02F,Y02T

Abstract:
1. A cylinder structure for an internal combustion engine comprising a cylinder head having an exhaust valve and a sleeve that slidably guides an exhaust valve rod, the cylinder structure satisfying the following conditions: 12%≦d/a≦27%, where d is a distance between an inner surface of the cylinder and an exhaust valve member and a is a diameter of the exhaust valve member; 40%≦c/b≦50%, where c is a length of a non-guided portion of the exhaust valve located below a lower end of the sleeve when the exhaust valve is closed, and b is a diameter of a cylinder bore; and 0.5%≦e/S≦0.8%, where e is a gap between the exhaust valve rod and the sleeve and S is a diameter of the exhaust valve rod.