초록 ▼

A supplemental charge for a hydrostatic steering system is provide by coupling the output of the transmission oil pump to the outlet of the steering charge pump and providing a check valve to prevent oil flow from the transmission oil pump to the steering charge pump unless the charge pump outlet pr

A supplemental charge for a hydrostatic steering system is provide by coupling the output of the transmission oil pump to the outlet of the steering charge pump and providing a check valve to prevent oil flow from the transmission oil pump to the steering charge pump unless the charge pump outlet pressure drops below the operating pressure of the transmission pump. When the steering charge pressure does drop below the transmission oil pressure, the check valve opens and oil is provided to the main steering pump by the transmission oil pump. A pressure transducer in the oil line activates a warning signal in the event the check valve is open more than a few minutes to alert the vehicle operator to a system failure.

대표청구항 ▼

[ I claim:] [5.] In a vehicle having a hydrostatic steering system including a main steering pump having an outlet, a charge pump having an outlet to provide a constant supply of oil to the main steering pump and a steering motor that receives oil from the main steering pump to control the direction

[ I claim:] [5.] In a vehicle having a hydrostatic steering system including a main steering pump having an outlet, a charge pump having an outlet to provide a constant supply of oil to the main steering pump and a steering motor that receives oil from the main steering pump to control the direction of travel of the vehicle, the vehicle further having another hydraulic system including a second pump with an outlet, the improvement comprising an oil line coupling the second pump outlet with the charge pump outlet and a check valve in the oil line operable to open and allow oil flow from the second pump to the main steering pump if the charge pressure drops below the oil pressure of the second pump whereby the charge pressure is maintained at the second pump oil pressure.