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US 2010/0132352 A1Published application
Hydrostatic transmission having proportional pressure variable displacement pump for loop charge and fan flow supply
AssigneeSauer-Danfoss Inc.
InventorCharles D. Throckmorton
Life of this patent
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Abstract
A hydrostatic transmission having a hydraulic pump that is fluidly connected to a hydraulic motor. The transmission also has a pressure control valve that has first and second stages and is fluidly connected to the hydraulic pump. By utilizing the pressure control valve when the first stage of the pressure control is at a minimum pressure the second stage determines the minimum charge pressure setting for the hydrostatic transmission.
Claims6
A hydrostatic transmission comprising;
- a hydraulic pump fluidly connected to a hydraulic motor that operates a fan;
- a pressure control valve having first and second stages and fluidly connected to the hydraulic pump;
- wherein when the first stage of the pressure control is at minimum pressure the second stage determines the minimum charge pressure setting for the hydrostatic transmission.
Dependencies are inferred from the claim text.