Outboard motor
AssigneeYamaha Hatsudoki Kabushiki Kaisha
InventorsYoshihiko OKABE, Daisuke NAKAMURA, Hirotoshi YAMAUCHI
Life of this patent
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Abstract
An outboard motor includes an engine that generates power and a transmission device arranged to change the speed of rotation of the engine and to transmit the rotation to a propeller. The transmission device includes a planetary gear type transmission mechanism arranged to shift to any of a plurality of speed positions, and the planetary gear type transmission mechanism is controlled to shift such that a sun gear and planetary gears unitarily rotate when a speed position is a normally used speed position. The outboard motor achieves a reduction in load normally caused by engagements between gears in a normally used speed position and also achieves significant improvement in durability of the gears.
Claims10
An outboard motor comprising:
- a case arranged to be supported by a hull of a boat;
- a propeller supported by a lower portion of the case;
- a transmission mechanism housed in the case and arranged to receive an output from an engine, to change a speed of the output, and to transmit the output;
- a bevel gear mechanism arranged to receive the output from the transmission mechanism and to transmit the output to the propeller;
- and
- a speed reducing mechanism interposed between the transmission mechanism and the bevel gear mechanism and arranged to receive the output from the transmission mechanism and to decelerate the output before transmitting the output to the bevel gear mechanism.
Dependencies are inferred from the claim text.