短语词组短语Standard involute spur -gear 标准渐开线直齿轮involute -column-bevel gear 渐开线圆柱斜齿轮non -involute gear-tooth profile 非渐开线齿廓involute straight -teeth bevel gear 渐开线直齿圆锥齿轮dual -involute gear reducer 长线齿轮减速器 返回 involute gear