| 摘要 |
An outboard motor provided with an engine (11) includes a power transmission device (30). The power transmission device (30) includes a drive shaft (21) which is driven by the engine (11) and a propeller shaft (23) which is driven by the drive shaft (21) through a bevel gear mechanism. The bevel gear mechanism includes a drive bevel gear (22) which is mounted to the drive shaft (21) and a forward driven bevel gear (24) and a reverse driven bevel gear (25) which are mounted around the propeller shaft (23) so as to face each other and engage with the drive bevel gear (22). The forward driven bevel gear (24) and reverse driven bevel gear (25) always engage with the drive bevel gear (22) and are selectively connected to or disconnected from the propeller shaft (23) via a clutch mechanism (27), a driven bevel gear including the forward driven bevel gear (24) and reverse driven bevel gear (25) and the drive bevel gear (22) are configured as straight bevel gears, and the forward driven bevel gear (24) and the reverse driven bevel gear (25) in the driven bevel gear are formed to be different in shapes in a tooth width direction at a side of each tooth thereof. |
