Patent ID: 8567368
Filing Date: 2013-10-29
Classification: F01L,F02B

Abstract:
1. A cylinder head structure in a four-cycle engine, comprising: a cylinder block having a cylinder bore in which a piston can be slidably fitted; a cylinder head connected to the cylinder block, the cylinder head forming a combustion chamber that faces a top of the piston in a space defined by the cylinder head and the cylinder block; a camshaft disposed on an extension of an open/close operation axis of an intake valve, the camshaft forming part of a valve actuating system driving to open and close the intake valve and an exhaust valve openably disposed in the cylinder head; an intake port disposed in a first side wall extending along an axis of the camshaft so as to be disposed in the cylinder head; an exhaust port disposed in a second side wall disposed in the cylinder head so as to oppose the first side wall; and a head cover forming a valve train chamber that accommodates therein the valve actuating system in a space defined by the head cover and the cylinder head, a connection surface formed in the cylinder head for connecting the head cover being extended to follow along a plane that is inclined so as to be spaced further away from the cylinder block toward the first side wall relative to the second side wall, wherein: wherein the intake port has an upper end disposed upward of a lower end of the camshaft, and wherein a stem of the intake valve driven to open or close by valve lifters is longer in length than the stem of the exhaust valve.