On the Theoretical Characteristics of Shifted Helical Gear pump

Abstract

In gear pumps which have a relatively small number of gear-teeth, the shifted gears are usually used to avoid the undercutting of the tooth profile. Besides, to equalize the wear of all teeth, the number of teeth of the driving gear is ofen different from that of the driven gear. For such gear pumps the author calculates the ideal delivery, the pulsation of the delivery, the variation or the trapped space, and the relation between the position of the pressure release port and the helical angle.