Static unbalance-type balance shafts with axis alignment preservation
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United States of America Patent
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Jan 27, 2004
Grant Date -
Jan 16, 2003
app pub date -
Jan 14, 2002
filing date -
Jan 13, 2001
priority date (Note) -
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Abstract
A static unbalance-type balance shaft for canceling unbalance forces of an engine includes a principal bearing journal located adjacent a first end of the shaft and an outrigger bearing journal located adjacent the second end of the shaft. A first counterweight is positioned adjacent one side of the principal journal and a second counterweight is positioned on the other side of the principal journal. The balance shaft has a small third outrigger counterweight or other source of unbalance positioned adjacent the outrigger journal for maintenance of the shaft's Effective Plane of Static Unbalance within the length of the principal journal while allowing the composite center of gravity of the first and second counterweights to be shifted away from the outrigger unbalance, for the purpose of improving the stability of shaft operating shape at the outrigger journal end of the shaft across the entire range of operating speeds.
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