Patent ID: 6227155
Filing Date: 2001-05-08
Classification: F01L,F01M,F02B,F02F

Abstract:
A structure for lubricating a cam shaft in a multi-cylinder engine, the multi-cylinder engine including a plurality of combustion chambers formed between a cylinder head and a plurality of pistons, said cylinder head being fastened to a cylinder block, the cylinder block including a plurality of cylinder bores and the pistons slidably fitted in the plurality of cylinder bores, a cam shaft linked with a plurality of intake valves and a plurality of exhaust valves for carrying out intake and exhaust operations for the plurality of combustion chambers rotatably supported at a plurality of locations spaced in the axial line direction of the cam shaft by cam bearing portions provided on the cylinder head and a cam holder removably fastened to the cam bearing portions, and an oil passage capable of supplying oil from an oiling passage provided in the cylinder head is formed in the cam shaft, said lubricating structure comprising:an oiling hole provided in the cam shaft in communication with the oil passage; andan oil groove in communication with an outer end of said oiling hole, said oil groove being formed in only one of the cam bearing portions provided in the cylinder head at a position corresponding to one of the plurality of combustion chambers, said oiling hole facing toward an outer surface of the cam shaft, said oil groove being in communication with said oiling passage.