3_ch 13 Mechanical Design budynas_SM_ch13

3_ch 13 Mechanical Design budynas_SM_ch13 -...

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Chapter 13 335 (b) p nb = p n cos φ n = 0 . 6283 cos 20° = 0 . 590 in Ans. (c) P t = P n cos ψ = 5 cos 30° = 4 . 33 teeth/in φ t = tan 1 (tan φ n / cos ψ ) = tan 1 (tan 20° / cos 30 ) = 22 . Ans. (d) Table 13-4: a = 1 / 5 = 0 . 200 in Ans. b = 1 . 25 / 5 = 0 . 250 in Ans. d P = 17 5 cos 30° = 3 . 926 in Ans. d G = 34 5 cos 30° = 7 . 852 in Ans. 13-7 φ n = 14 . 5°, P n = 10 teeth/in (a) p n = π/ 10 = 0 . 3142 in Ans. p t = p n cos ψ = 0 . 3142 cos 20° = 0 . 3343 in Ans. p x = p t tan ψ = 0 . 3343 tan 20° = 0 . 9185 in Ans. (b) P t = P n cos ψ = 10 cos 20°
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