Control device for a hydraulic motor
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United States of America Patent
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Apr 30, 2013
Grant Date -
Mar 3, 2011
app pub date -
Sep 2, 2009
filing date -
Sep 2, 2009
priority date (Note) -
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status (Latency Note)
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Abstract
A control device for controlling a speed of a hydraulic motor includes a housing defining a first void. A speed valve is disposed within the first void and is moveable between a first speed valve position and a second speed valve position. The first void includes a speed valve pressure chamber disposed at one end of the speed valve. A speed valve spring is disposed at another end of the speed valve. The housing further defines a speed change port and a speed change passage interconnecting the speed change port and the speed change pressure chamber for directing a pressurized fluid directly into the speed valve pressure chamber to exert a pressure force on the speed valve and bias against the speed valve spring to move the speed valve between the first speed valve position and the second speed valve position.
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