27_ch 14 Mechanical Design budynas_SM_ch14

27_ch 14 Mechanical Design budynas_SM_ch14 -...

Info iconThis preview shows page 1. Sign up to view the full content.

View Full Document Right Arrow Icon
Chapter 14 375 Wear Table 14-8: C p = 1960 ± psi Table 14-7: 0 . 99 ( S c ) 10 7 = 75 000 psi = ( σ c ,all ) P = ( σ c ,all ) G W t 3 = ² ( σ c ,all ) P C p ³ 2 FdpI K o K v K s K m C f W t 3 = ² 75 000 1960 ³ 2 3 . 25(5 . 5)(0 . 1176) 1 . 25(1 . 534)(1)(1 . 24)(1) = 1295 lbf W t 4 = W t 3 = 1295 lbf H 4 = H 3 = 1295(1649) 33 000 = 64 . 7hp Rating H rated = min(76 . 7, 94 . 4, 64 . 7, 64 . 7) = 64 . 7hp Ans . Notice that the balance between bending and wear power is improved due to CI’s more favorable S c / S t ratio. Also note that the life is 10 7 pinion revolutions which is (1 / 300) of 3(10 9 ). Longer life goals require power derating. 14-31 From Table A-24 a , E a v = 11 . 8(10 6 ) For φ = 14 . 5 and H B = 156 S C = ´ 1 . 4(81) 2 sin 14 . / [11 . 8(10
Background image of page 1
This is the end of the preview. Sign up to access the rest of the document.

This note was uploaded on 12/13/2011 for the course EML 3013 taught by Professor Shingley during the Fall '11 term at UNF.

Ask a homework question - tutors are online