Step-change transmission having charge and variable displacement pumps
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United States of America Patent
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Dec 4, 2012
Grant Date -
Apr 3, 2008
app pub date -
Aug 31, 2007
filing date -
Sep 29, 2006
priority date (Note) -
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Abstract
A transmission is provided for a mobile machine. The transmission may have a plurality of available gear combinations selectively engaged to produce multiple stepped output ratios. The transmission may also have a first fluid pump and a second fluid pump. The first fluid pump may be configured to pressurize a first flow of fluid. The second fluid pump may have variable displacement to pressurize a second flow of fluid. At least one of the first and second flows of fluid may be directed to cause selective engagement of the plurality of available gear combinations.
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