Outboard motor steering system

Marine propulsion – Self-propelled vehicle having land and water propulsion means – Having separated propulsion means for land and water

Reexamination Certificate

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Reexamination Certificate

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10780065

ABSTRACT:
An outboard motor steering system for an outboard motor mounted on a stern of a boat and having an internal combustion engine and a propeller with a rudder powered by the engine to propel and steer the boat. The system includes a swivel shaft connected to the propeller, a swivel case rotatably accommodating the swivel shaft, and a hydraulic cylinder connected to the swivel shaft to rotate it. The swivel case is formed with a box-like recess to accommodate the hydraulic cylinder therein such that the hydraulic cylinder does not project outside a profile of the outboard motor, regardless of a steered angle of the outboard motor. A rotation angle sensor is also installed in the recess and outputs a signal indicative of an angle of swivel shaft rotation. Further, moving orifices are provided in a hydraulic pressure circuit of the actuator for relieving excessive hydraulic pressure. Thus, space utilization around the outboard motor and boat is not restricted and steering feel is improved.

REFERENCES:
patent: 3084657 (1963-04-01), Kiekhaefer
patent: 4545770 (1985-10-01), Ferguson
patent: 5190488 (1993-03-01), Fujimoto
patent: 6155797 (2000-12-01), Kazuyoshi
patent: 2003/0109184 (2003-06-01), Kanno
patent: 2004/0173734 (2004-09-01), Alsobrooks et al.
patent: 61-263897 (1986-11-01), None
patent: 62-125996 (1987-06-01), None
patent: 62-166193 (1987-07-01), None
patent: 62-231896 (1987-10-01), None
patent: 1-116795 (1989-08-01), None
patent: 1-179098 (1989-12-01), None
patent: 02-279495 (1990-11-01), None
patent: 06-127475 (1994-05-01), None
patent: 10-185621 (1998-07-01), None
patent: 2000-121309 (2000-04-01), None
patent: 2002-022487 (2002-01-01), None
Japanese Office Action dated Dec. 13, 2005.

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