In this paper, the complex problem of deflection of loaded spur teeth cut in thin rims is studied.Tooth-deflection curves, modified for the effect of elasticity of the gear, and rim stiffness factors are introduced.

The problem of involute helical gear noise is studied by running a pair of 6 DP gears in a power circulating rig inside an anechoic room. More than 3500 magnetic tape recordings were taken and analyzed, for gears running at different speeds and transmitting different loads. A pair of 14 DP nickel steel gears of finished, ground, and shaved teeth was also tested to study the effect of surface finish on gear noise. Experimental results revealed that the main sources of gear noise are impact between gear teeth and friction. A sudden rise in noise level has been noticed when a whole number of teeth are in contact. This paper presents experimental results and study of noise of involute helical gears of different facewidths and pitches, running at different speeds, and transmitting different loads. The source of gear noise and noise generating mechanisms are also discussed.

The paper presents results of strain gage investigations conducted on steel spur gears to measure the instantaneous load on the tooth under static and dynamic conditions.

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THE UNE OF CJNr>JCT Fig. 12 Static relative displacements at different angular positions TFLOTH MO 2 IH MTSH ' TJM" MH' txKM of ioao Fig. 13 Maximum dynamic increments at different speeds and static loads 3 Effect of torsional vibrations and dynamic unbalance on dynamic loading. 4 Effect of cyclic variation of the externally applied load on the dynamic loading.