Outboard motor

Details Outboard motor Outboard motor

2007-11-27

2007-11-27

Avila, Stephen (Department: 3617)

Marine propulsion

Screw propeller

With vibration dampening

Reexamination Certificate

active

11157594

ABSTRACT:
In an outboard motor, an extension case (member constituting a frame of the outboard motor) has the natural frequency (resonance frequency) of higher than the vibration frequency produced when the engine operates at maximum speed. Since this configuration prevents the extension case from resonating during operation of the outboard motor, noise (more specifically, noise produced by the outboard motor) propagated to the outside can be reduced.

REFERENCES:
patent: 4395982 (1983-08-01), Moller
patent: 4583953 (1986-04-01), Nakase
patent: 4805724 (1989-02-01), Stoll et al.
patent: 6358106 (2002-03-01), Herrera
patent: 6875066 (2005-04-01), Wolaver
patent: 2002/0134193 (2002-09-01), Lawrence
patent: 09-207888 (1997-08-01), None

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