力士乐齿轮泵的实际流量和理论流量之比称为容积效率ηpv=Q/Qn=(Qr~OQ)/Qr=1-0Q/Qr且Q=Qr*Npv
功率、机械效率和总效率
输入功率P;驱动液压泵的机械功率,由电动机或柴油机给出P; =2πnMr
输出功率Po液压泵输出的液压功率,
P.=pQr
根据能量守恒,有pQ_=2πM~n将Q.=qn,消去n得M~=pq/2π
实际_上,由于泵内有各种机械和液压摩擦损失,泵的实际输入转矩应大于理论转矩
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