Patent ID: 7118434

Claim:
Outboard drive unit for boats for driving at least one propeller, comprising, firstly, an underwater housing ( 6 ) in which a drive shaft ( 16 ), which in the operating state of the drive unit is essentially vertical, is rotatably mounted and which, via a bevel gearing ( 19 , 20 , 21 ) is drivably coupled at a lower end to at least one propeller shaft ( 7 , 8 ) mounted in the underwater housing, and, secondly, a gear housing ( 11 ) joined to the underwater housing and enclosing a second bevel gearing ( 13 , 14 , 15 ), via which the upper end of said essentially vertical drive shaft is drivably coupled to an at least substantially horizontal shaft ( 12 ), and mounting elements ( 23 ) for mounting the drive unit with the underwater housing on the outside and the gear housing on the inside of a boat hull, characterized in that a lubricating oil chamber ( 33 ) is arranged between the underwater housing ( 6 ) and the gear housing ( 11 ), said chamber being bounded by a space ( 36 ) through which surrounding water flows.