| 摘要 |
<p>The invention concerns a hull and a submerged propeller unit (22) demountably fitted to the hull and continuously rotatable through 36° of azimuth relative to the hull to give full thrust in any required direction. An aperture in the hull is surrounded by a fixing flange (29) to which extend a drive input shaft (12) for the propeller unit (22) and at least one steering drive shaft (62). At least one steering drive motor (64) is mounted in the vessel and is connected to the steering drive shaft (62) to effect rotation thereof. A gearbox casing (31, 32) of the propeller unit fits in the aperture with a circumferential flange (34) releasably bolted (35) to the fixing flange (29). A stem (42, 45) depends from said casing and is rotatably supported therein at its upper end to act as a steering tube for a propeller (22) rotatably supported at its lower end. A steering gear wheel (55) in said casing (31, 32) through which the stem (42) passes and to which it is secured effects rotation thereof. Steering drive gear means (56) rotatably supported in said casing (31,32) in mesh with the steering drive wheel (55) is releasably connected to said steering drive shaft (62) so that operation of said steering motor (64) rotates the propeller unit (22). A drive transmission shaft (16) for the propeller (22) extends through the stem (42, 45) is releasably connected at its upper end to the main drive shaft (12) whereby when the propeller unit (22) is dismounted from the vessel the steering gear wheel (55) and the gear means (56) are removed in the casing (31, 32) as part of the demountable propeller unit (22).</p> |
