提出了运动优化的方法，通过预设传动误差抛物线函数，使齿面啮合时运动误差和不连续性减至最小。
The motion optimization method is proposed, by which transmission errors anddiscontinuousness of tooth surface meshing is decreased to minimum.
泵工作时，由于两从动螺杆与主动螺杆左右对称啮合，故作用在主动螺杆上的径向力完全平衡，主动螺杆不承受弯曲负荷。
Pumps work, as the two screws driven screw symmetrical and active engagement, so the role of the active radial force on the screw entirely balanced, active screw does not bear bending loads.
在不增加啮合齿向误差的前提下，合理给定支承平行度要求。
Under the precondition of an absence of increase in gear mesh error a rational support parallelism can be set.
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