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14_ch 15 Mechanical Design budynas_SM_ch15

14_ch 15 Mechanical Design budynas_SM_ch15 - 392 SF n 11 =...

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392 First gather all of the equations one needs, then arrange them before coding. Find the required hardnesses, express the consequences of the chosen hardnesses, and allow for revisions as appropriate. Pinion Bending Gear Bending Pinion Wear Gear Wear Load-induced s t = W t PK o K v K m K s F K x J P = s 11 s t = W t PK o K v K m K s F K x J G = s 21 σ c = C p W t K o K v C s C xc Fd P I 1 / 2 = s 12 s 22 = s 12 stress (Allowable stress) Tabulated ( s at ) P = s 11 S F K T K R ( K L ) P ( s at ) G = s 21 S F K T K R ( K L ) G ( s ac ) P = s 12 S H K T C R ( C L ) P ( C H ) P ( s ac ) G = s 22 S H K T C R ( C L ) G ( C H ) G strength Associated Bhn = ( s at ) P 2100 44 ( s at ) P 5980 48 Bhn = ( s at ) G 2100 44 ( s at ) G 5980 48 Bhn = ( s ac ) P 23 620 341 ( s ac ) P 29 560 363 . 6 Bhn = ( s ac ) G 23 620 341 ( s ac ) G 29 560 363 . 6 1 hardness Chosen ( H B ) 11 ( H B ) 21 ( H B ) 12 ( H B ) 22 hardness New tabulated ( s at 1 ) P = 44( H B ) 11 +
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