Spur-gear teeth have rolling and slipping contact (often
Chapter 14, Problem 14.31(choose chapter or problem)
Spur-gear teeth have rolling and slipping contact (often about 8 percent slip). Spur gears tested to wear failure are reported at 108 cycles as Buckinghams surface fatigue load-stress factor K. This factor is related to Hertzian contact strength SC by SC 5 A 1.4K (1yE1 1 1yE2) sin f where f is the normal pressure angle. Cast iron grade 20 gears with f 5 141 2 and 20 pressure angle exhibit a minimum K of 81 and 112 psi, respectively. How does this compare with SC 5 0.32HB kpsi?
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