在加工中,为防止产生根切,伞齿轮的实际压力角必须大于最小压力角。最小压力角可以从下面公式求出:式中:φ—最小压力角;γ—节锥半角;δ—齿根角。小齿轮的节锥半角为:r=arctg(n/N)式中:n—小齿轮齿数;N—大齿轮齿数。齿根角可定义为齿根圆锥面与节圆锥面间 In processing, in order to prevent undercutting, the actual pressure angle of the bevel gear must be greater than the minimum pressure angle. The minimum pressure angle can be obtained from the following formula: Where: φ - the minimum pressure angle; γ-section conical half-angle; δ-root angle. The pinion cone section angle is: r = arctg (n / N) Where: n-pinion teeth; N-gear teeth. Dedendum angle can be defined as the root cone and pitch conical surface