The new reliability design theory of multi - mode correlation machine parts is used to compute the strength reliability of cyclindrical gear , and the computed result is compared with the computed results using the independence suppose theory and weakness theory , thus , illustrating that the exactness and practicibility of the computed result using the new reliability design theory of multi - mode correlation machine 摘要利用多模相关机械零件可靠性设计新理论，对硬齿面的圆柱斜齿标准齿轮进行了强度可靠性设计计算，并将计算结果与独立假设理论和薄弱环节理论的计算结果进行了比较，说明了多模相关机械零件可靠性设计新理论计算的精确性和实用性。
The researchful results indicate that the flux pulse ration of ordinary helical gear pump without clearance is less than that of the gear pump with clearence under the condition that the main parameters are same , and the flux pulse ration of ordinary helical gear pump is less than that of whole profile meshing helical gear pump 研究结果表明：在主要参数相同的情况下，普通斜齿齿轮泵无侧隙时流量脉动率小于有侧隙时的流量脉动率；全齿廓啮合斜齿轮泵比普通斜齿轮泵的流量脉动略小。
4 . based on the viscous hydrodynamics , the leakage characteristics of newton liquid that is transmitted by helical gear pump are researched for the aim of the least power loss , and the leakage model is founded , the mathematic models of the radial and the axial leakage are gained . at the same time the optimal radial leakage and axial leakage are got , and the numerical calculation is achieved 基于粘性流体力学，以功率损失最小为目标，首次对牛顿流体在斜齿齿轮泵中的漏流特性进行了研究，建立了泄漏模型，分别得到了斜齿齿轮泵的径向和轴向泄漏的数学计算模型；同时得到了斜齿齿轮泵最佳径向间隙和最佳轴向间隙，并在此基础上进行了数值计算。
Based on the ostwald - de waele equation , the leakage characteristics of power - law transmitted by helical gear pump are researched , and the leakage model of power - law in the clearence is founded , and - the velocity distributing and the leakage capacity are worked out by the boundary condition . the power loss of leakage is got through the clearence leakage capacity , and the friction power loss is attained by the velocity distributing . the mathematic calculation model 利用幂律流体本构方程，首次对聚合物流体在斜齿齿轮泵中的漏流特性进行了研究，建立幂律流体在间隙中的泄漏模型，利用边界条件求出速度分布及泄漏量；由间隙泄漏量得到漏流损失功率，由速度分布得到流体摩擦功率损失，并得到间隙最优解的数值计算数学模型，同时给出实例及数值计算结果。
3 . the trapping characteristics of ordinary helical gear pump are lucubrated by theory for the first time , the theoretic relation of the gear rotor between the end overlap coefficient and trapping phenomenon is discussed respectively with clearence or without clearcence , and the relation of trapping volume with the rotational angle turn is also discussed . the selective range of the helical angle that can eliminate completely the trapping of helical gear pump is gained , which never appeared in literature before 首次对普通斜齿齿轮泵的困油特性进行深入的理论研究，分别讨论了有侧隙和无侧隙时普通斜齿齿轮泵转子的端面重合度与困油现象之间的理论关系，以及困油容积随转角的变化关系，得到了完全消除斜齿齿轮泵困油冲击的螺旋角机械科学研究院博士学位论文的选择范围。
In this paper , the relation between differential driven ratio accuracy and the common normal length error of cylindrical bevel wheel has been found by experimental method , which provides a efficient way for cylindrical bevel wheel manufacturer to control the common normal length error of the wheel 摘要通过实验研究，寻找出差动传动比的精度与斜齿圆柱齿轮的公法线长度误差的关系，从而为斜齿圆柱齿轮的加工提供一个可以控制斜齿圆柱齿轮公发线长度误差的有效方法。
With the research in the paper succeeded it would be certain that the helical gear pump would replace the spur gear pump now widely existed in the market and also could replace the other type of hydraulic pump in some areas , which surely greatly decrease the cost of manufacture and advance the development of technology . the importance is undisputable 本论文研究的斜齿啮合式低脉动齿轮泵可代替现广泛存于市场上的直齿轮泵，并能在很大程度和范围内替代其它形式液压泵的作用，这对于促进机械装备的技术进步、降低机械装备的制造成本具有十分重要的意义，其应用前景将十分广阔。
Secondly , this article studies the static working state of the labyrinth seals in steady flow , including the cavity the relative thickness between gear the proportion of cavity depth to cavity width various gears the level angle of gear the influences of helical gear angle and it ' s flowing direction 2 、研究迷宫密封在定常流动下的静态工作特性，其中主要包括空腔数、齿间相对厚度、间隙与空腔宽度之比、空腔深宽之比、不同齿形、齿面倾斜角、斜齿倾角和流向等的影响。
At first , on the base of the analysis of the mechanism of the helical gear pump , the paper try to find the relationship of the helical gear pump flow pulse with its corresponding parameters , give the solution of the problems brought by the replace of spur gear to lay the firm basis for the structural design of helical gear pump 本论文在对齿轮泵工作原理和流量脉动机理分析的基础上，首先探讨了斜齿齿轮泵的输出流量脉动与斜齿轮各结构参数之间的关系，以及由于斜齿轮替代直齿轮带来的相关问题并提出解决办法，为斜齿齿轮泵的结构设计奠定基础。
