| 摘要 |
A hydraulic system 10 for a vehicle, typically a truck or other commercial vehicle, comprises a pump 14 drivable by an engine and decouplable from the engine using a clutch 20. Pump 14 pumps hydraulic fluid through two hydraulic circuits 22, 28, with a valve 32 distributing fluid through circuits 22, 28. First circuit 22 comprises a hydraulic accumulator 24 and a closed centre steering gear 26 of a power steering system. Second circuit 28 comprises a hydraulic motor 30, which may drive a fan 36. Pump 14 may be driven through an air compressor 16 driven by the engine. A cooler 40 may be provided in one of the circuits 22, 28 to cool the hydraulic fluid. Hydraulic system 10 may be operated efficiently, with low parasitic load on the engine when steering assistance is not required. |
