Outboard motor
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United States of America Patent
Stats
-
Nov 27, 2007
Grant Date -
Dec 29, 2005
app pub date -
Jun 21, 2005
filing date -
Jun 25, 2004
priority date (Note) -
Expired
status (Latency Note)
Importance
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.
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