addendum modification
2.Two methods are usually used to increase gearing backlash for counter trains:1.Decrease addendum modification coefficient,but remain center distancein constant.
3.Therefore,the suitable coefficient of engagement overlap got by profile correction and addendum modification is beneficial to the output property of the gear pump.
4.The problems such as antenna length calculation, shaving stock and check of addendum modification of preshaving hob used in the process of gear hobbing before shaving are analyzed and researched theoretically.
5.According to the non-backlash meshing basic relation ship and the requirement of equality of addendum reducing coefficients,the paper applies computational methods of computer programming and cut-and-try to determine the modification coefficient of idle gear in ordinary gear train.
