Property Analysis Of High Viscidity Gear Pump & Optimization Of The Gear Parameters

The pump gears with large module and less number of teeth are adopted by the high viscidity gear pump. When they are in mesh,meshing interference happens. In order to avoid interference of flank,tooth profile is modified. Therefore this study focuses on the output property of the gear pump after profile correction.Firstly the reason of interference of flank is analyzed and contact ratio and overlap ratio and the point of profile modification are calculated according to two conditions. Then a formula about flow of the gear pump and the coefficient of engagement overlap to find is obtained by area method. Through analysis contact ratio and overlap ratio has the effect on the volume oil and the flow pulsating ratio. Eventually with the optimizing method,primarily to the maximum flow,this paper makes an account of the researches on the optimum parameters of the gear geometry of gear pumps.Example shows that contact ratio and overlap ratio has the effect on the volume oil and the flow pulsating ratio. If the coefficient of engagement overlap decreases,the flow aggrandize,trapping volume and the flow pulsating ratio decreases. Therefore,the suitable coefficient of engagement overlap got by profile correction and addendum modification is beneficial to the output property of the gear pump.