| 摘要 |
An outboard motor (1), which is improved for higher output energy, lower fuel consumption, and also simplified in layout of oil paths and facilitating maintenance of hydraulic control valves, includes an engine (2) that comprises a crank shaft (24), engine body (3) mounted to a mount case (4), and valve driving mechanism (M1) for opening and closing a pair of intake valves (33) and a pair of exhaust valves 34. The valve driving mechanism (M1) includes a valve operating characteristics variable mechanism (M2) of a hydraulic type, which changes operating characteristics of the intake valves 33 in accordance with the revolution speed of the engine. A hydraulic oil path for supplying the valve operating characteristics variable mechanism (M2) with hydraulic oil branches from a lubricant oil path for supplying bearing portions of a crank shaft (24) and the valve driving mechanism (M1) with lubricant oil. The branching portion is formed in an upper seal cover (26) forming an upper wall portion of the engine body (3), and a spool valve is provided at the branching portion to control the hydraulic oil pressure.
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