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一、双偏心机构的原理与特点利用双偏心机构调整行程，主要由偏心轴（1）、偏心套（2）在180°的范围内进行园周运动，根据所处的不同位置改变活塞（3）的上死点a与下死点b之间的距离S，从而达到调节泵量的目的。当偏心轴与偏心套离轴心o、o_1最远一点即On、Om在同一方向，一条水平线上（OnOm点重合），此时活塞行程S为最大（Smax）。（见图1）。而当On、Om处在相反位置，同一条水平线上，此时活塞行程S为最小（Smin）。（见图2）。在偏心轴旋转180°的范围内，根据设计所需的泵量来确定不同的旋转角On，以致使活塞行程Sn相应变化，可得到不同的泵量值（见图3）。
First, the principle and characteristics of double-eccentric mechanism The use of double-eccentric mechanism to adjust the trip, mainly by the eccentric shaft (1), eccentric sleeve (2) in the range of 180 ° Park circumference movement, according to the different positions to change the piston ) Of the top dead center a and the bottom dead center b between the distance s, so as to achieve the purpose of regulating the pump. When eccentric shaft and eccentric sleeve away from the center of o, o_1 furthest point that On, Om in the same direction, a horizontal line (OnOm point coincide), the piston stroke S at this time (Smax). (see picture 1). When On, Om in the opposite position, the same horizontal line, then the piston stroke S is the minimum (Smin). (See Figure 2). In the range of 180 ° rotation of the eccentric shaft, the different rotation angles On are determined according to the pump volume required for the design, resulting in a corresponding change in piston travel Sn, resulting in different pump values (see Figure 3).