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由定量泵与变量马达构成的开式静压回路具与成本低、效率高等优点，已在装载机等工程机械上得到应用。但该回路采用定量泵无法实现排量调整，所以换向冲击成为这种传动方式一个棘手的问题。换向冲击对机器的寿命和操作舒适性都有较大的不良影响，因此必须设法消除换向冲击。采
The open type static pressure circuit composed of a fixed pump and a variable motor has the advantages of low cost and high efficiency and has been applied to construction machines such as loaders and the like. However, this circuit using quantitative pump displacement can not be achieved, so the commutation impact has become such a transmission mode a thorny issue. Commutation impact on the machine’s life and operational comfort have a greater adverse effects, it must try to eliminate the commutation impact. Mining