Is a
Patent attributes
Patent Jurisdiction
Patent Number
Patent Inventor Names
Norman John Smith0
Date of Patent
April 6, 2010
0Patent Application Number
117958950
Date Filed
January 30, 2006
0Patent Citations Received
Patent Primary Examiner
Patent abstract
A hydraulic drive apparatus comprises a main pump for pumping hydraulic fluid through a hydraulic load, a charge pump for continuously pumping pressurized hydraulic fluid to the main pump, and a hydraulic fluid cooler. At least a portion to the hydraulic fluid pumped through the hydraulic load is returned under pressure to the charge pump and the charge pump pumps the pressurized hydraulic fluid through the hydraulic fluid cooler to the main pump.
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