| 摘要 |
In an outboard engine, a support member (35) for supporting a drive shaft (25) and an exhaust pipe (31) within an extension case (4) can be cooled by outside water (w) pumped by utilizing the exhaust pressure from the engine (3). The inside of the extension case (4) is divided, by the support member (35) for supporting the drive shaft (25) and the exhaust pipe (31), into an uper chamber (361) communicatig with the open air, and a lower chamber (362) into which outside water is introduced, so that the exhaust gas from the exhaust pipe (31) is discharged into the lower chamber (362).Both the upper and lower chambers (361,362) are in communication with each other through a communication pipe (46). Thus, during operation of the engine (3), the support member (35) and the depending members (25,31) are cooled by the outside water (w) forced up from the lower chamber (362) through the communication pipe (46) into the upper chamber (361). <IMAGE> |
