正齿轮传动 meaning in Chinese

spur gear drive
spur gear operated
spur-gear drive

Spur gear drives for fine mechanics ; tables
精密机械用正齿轮传动装置.第4部分:表格
Spur gear drives for fine mechanics ; calculating sheet
精密加工用正齿轮传动装置.计算表
Spur gear drives for fine mechanics ; indication in drawings , examples for calculation
精密加工用正齿轮传动装置.图样上的标注.计算示例
Spur gear drives for fine mechanics ; scope , definitions , principal design data , classification
精密机械用正齿轮传动装置.第1部分:适用范围定义