| 摘要 |
An outboard motor (10) having an engine (11) is provided with a power transmission mission device. 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 (28). The bevel gear mechanism (28) 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 arranged around the propeller shaft (23) so as to face each other and are engaged with the drive bevel gear (22), and the forward driven bevel gear (24) and the reverse driven bevel gear (25) always engage with the drive bevel gear (22) and are selectively disconnected from the propeller shaft (23) through a clutch mechanism (27). The drive bevel gear (22), the forward driven bevel gear (24) and the reverse driven bevel gear (25) are configured as straight bevel gears, and only the drive bevel gear (22) is provided with a crowning portion expanding a side surface portion of each teeth outwardly in a tooth thickness direction at an intermediate portion in a tooth width direction.
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