The paper presents the results of an experimental investigation carried out at Mansoura University Laboratories aiming at studying the effect of the change of applied tooth load, lubricating oil and helix angle on wear of involute helical gears. Different pairs of test gears of 6 D.P., 91.5 mm pitch diameter with 22.3o, 33.6° and 42.25° helix angles were run in power circulating gear test rig at speeds of 1500 and 3000 r.p.m and under different normal tooth loads ranging from 1000 10 3800 Kp. The gears were lubricated with oils of kinematic viscosities 200, 462 and 653 cSt at 40°C. Results show that wear increases with increasing tooth load and the helix angle, and decreases with increasing the oil viscosity. Wear of the driven gear is more than that of the driving gear under the same running conditions.
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