Hydraulic fan drive system
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United States of America Patent
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Feb 21, 2017
Grant Date -
Aug 27, 2015
app pub date -
Feb 21, 2014
filing date -
Feb 21, 2014
priority date (Note) -
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Abstract
A debris collection vehicle having an enclosed volume for collecting debris and a hydraulic fan drive system for creating vacuum condition in the enclosed volume is disclosed. In one embodiment, the hydraulic fan system includes a closed loop hydraulic circuit, a variable displacement hydraulic pump disposed within the closed loop circuit, and a hydraulic motor disposed within the closed loop circuit. The hydraulic fan drive system can also include an electronic or hydraulically actuated control valve constructed and arranged to adjust the output of the hydraulic motor via a displacement actuator based on pressure in the closed loop hydraulic circuit.
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