On the Clearances between the Casing and the Tips of the Gear-teeth of Sine-curved Gear Pump

Abstract

The author calulated the leakage of oil through the clearances between the casing and the tips of the gear-teeth of sine-curved gear pump devised by Dr.S. ITAYA. And considering the resistance to the motion of gear-teeth also, the author gave the best value of clearances which makes the energy loss at the clearances minimum expressed by the next equation : [numerical formula], where μ=viscosity of oil kg. sec/cm², N=r.p.m., P_d And P_s=delivery and suction pressure kg/cm², R=radius of curvature at the tips of gear-teeth cm, T=no. of teeth contacting the casing, and 2 R₂=external diameter of gears.