An exact shell clack sheet's geometric size calculation is the most important link n he design of manufacturing a spherical vessel.

精确的球壳瓣片的下料尺寸计算，是设计制造球罐的重要一环。

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Calculation of the geometric size of the modified gear, analysis of the flow characteristics of the outer-engaged gear pump, leakage and gap, radial force are discussed in this paper.

分析了影响外啮合直齿轮机油泵容积效率的主要因素 ，对油泵齿谷产生空穴和间隙漏损的机理进行了探讨。

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