齿轮轮齿接触印痕
gear tooth contact pattern
复合轮齿齿轮副
complex wheel teeth gear set
活齿少齿差齿轮副
oscillating tooth gear pair with small teeth difference
少齿差齿轮副
less tooth difference gear pair
internal gear with small teeth difference
小齿轮轮齿啮合
pinion gear tooth contact
小齿轮轮齿啮合型式
pinion tooth contact pattern
一齿差齿轮传动
gear transmission of one difference tooth
差速器齿轮齿隙调整
differential gear backlash adjustment