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详细论述了ND5型机车起动机油泵和燃油输送泵的齿形特点、啮合原理及计算方法。它们是具有特殊齿形的内啮合齿轮泵。在对泵的性能要求不高，但对结构尺寸要求紧凑的应用场合，这种齿形的齿轮泵具有较大的实用性。
Discusses in detail ND5 locomotive starter pump and fuel pump tooth profile, meshing principle and calculation method. They are special toothed internal gear pumps. In the pump performance is not demanding, but the compact size requirements of the application, this tooth-shaped gear pump has great practicality.