| 摘要 |
PCT No. PCT/SE93/00552 Sec. 371 Date Feb. 1, 1995 Sec. 102(e) Date Feb. 1, 1995 PCT Filed Jun. 22, 1993 PCT Pub. No. WO94/00338 PCT Pub. Date Jan. 6, 1994.A boat propulsion unit intended to be suspended on the outside of a boat transom, comprises a propeller drive shaft housing, a suspension arrangement intended to be fixedly secured to the transom, and a pivot for the drive shaft housing to allow pivotal displacement of the drive shaft housing relative to the suspension arrangement about a pivot axis in a vertical plane and a pivot axis in a horizontal plane. A steering device effects pivotal displacement of the drive shaft housing about the first-mentioned axis, and trim and tilt structure effects pivotal displacement of the drive shaft housing about the second-mentioned axis. The trim structure comprises at least one piston-cylinder arrangement (21, 27) having a cylinder space (45) in communication with a water inlet (31) such that the ram pressure created by the water flowing into the water inlet and dependent on the speed of the boat during forward motion generates a pressure in the cylinder space (45) which strives to trim the propulsion unit (1) away from the transom, and a spring (28) the force of which acts only in the same direction as the water pressure prevailing in the cylinder space. The spring is disposed in the cylinder (21) on only one side of the piston (27).
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