Effects of Overloading at the Commencement of Running upon Accuracy and Surface Durability of Gears

概要

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After overloading with a tangential load 7 to 15 times the allowable one for pitting gear endurance tests were conducted on hobbed gears of 0.45 percent carbon steel having Brinell hardnesses of 160 and 180. the results obtained are as follows : (1) The gears can be operated under a Hertzian stress greater than a shakedown limit, 4.0τ_K≒0.4H_B, which is calculated using the yield stress in a simple tension test. (2) When the gears were overloaded with a tangential load corresponding to a 0.96H_B Hertzian stress for 5×10^3 rotations, and thereafter, interchanging the driving and following gears, rotated through another 5×10^6 rotations at a Hertzian stress of 0.66H_B, only a a single pit occurred in the new driving gear and 7 pits occurred in the new following gear. (3) Increase in load carrying capacity observed n the overloaded gears, can be attributed to smoothing of the surface and work hardening of both subsurface and surface of the gear teeth. (4) A pit having many cracks in its bottom was found, and these cracks seemed to have been propagated by a hydraulic pressure mechanism of lubricating oil.
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