交错轴渐开线斜齿轮传动
crossed helical involute gear pair
空间相错轴螺旋齿圆柱齿轮传动
Spatial skew axis helical gearing drive
内齿轮传动
automatic thermo type fire alarm
internal gear drive
双圆弧齿轮传动
Double arc gear transmission
double circular arc gears transmission
双圆弧弧齿锥齿轮传动
Double circular arc profile bevel gears