Modifiedgear can break through the limit of spur gear in using. But modifiedgear must be manufactured with special design tools in some conditions.
变位齿轮可以有效突破标准渐开线齿轮存在的使用局限性，但在某些情况下必须采用专门设计的刀具加工。
2
The rational rough and technological parameter of profile modifiedgear is gained by analysis and optimizing of forming, and the preliminary shaping size of product is defined.
Calculation of the geometric size of the modifiedgear, analysis of the flow characteristics of the outer-engaged gear pump, leakage and gap, radial force are discussed in this paper.