pitch curve meaning in English

齿轮节线
分度曲线
节面曲线
凸轮理论廓线

A mathematical model for gear shaping was presented for machining of externally meshed non - circular gears with shaping procedure in terms of the positional relationship between the tool ( cutter ) and gear ' s pitch curve
摘要根据范成法加工外啮合非圆齿轮时刀具和齿轮节曲线间的位置关系，提出了插齿加工的数学模型。
According to the simulation result , the characteristics of tooth profile such as undercut and convexity of pitch curve of the machined gears could be analyzed and judged , so that a sort of intuitive judgment method was provided for designing and manufacturing of externally meshed noncircular gears with closed pitch curve
根据仿真图形结果可以分析和判断所加工的非圆齿轮的齿形特征，从而为设计和制造节曲线封闭型外啮合非圆齿轮提供了一种直观的判断方法。
Mandarin tone is characterized for tone level and tendency of pitch curve , so head - tail difference and relative tone level rate are determined as tone features for chinese tn - syllable word ; head - tail difference and tone level at the beginning of syllable are determined as tone features of syllable in continuous speech
汉语声调主要由基音曲线的调位高低和走向决定。因此，本文选择头尾差和相对调位比作为三字词音节的声调特征；选择头尾差和音节起点调位作为连续语音中音节的声调特征。