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945_Mechanics Homework Mechanics of Materials Solution

945_Mechanics Homework Mechanics of Materials Solution -...

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Unformatted text preview: 8.29 The solid shaft AB rotates at 450 rpm and transmits 20 kW fi‘om the motor M to machine tools connected to gears F and G. Knowing that rm = 55 MPa and assmning that 8 kW is taken ofl‘ at gear F and 12 kW is taken off at gear G, determine the smallest permissible diameter of shafi AB. PROBLEM 8.30 8.30 Solve Prob. 8.29, assuming that the entiie 20 kW is taken off at gear G. SOLUTION ~F: %—SO£=7.5HZ Torque apppiea‘ aJ' D _ _E_ - £12191 = . To - 21H? - (21:)(75) LITiJ-ll N m flmque on flea.» E Ts - Ta = 424.4! N-m _ Forces on gears. DIM E Z c 225 _ '1.» _ 414."! _ F» - [in -——-———-wow, - 4244 N 150 = 1; _ ‘JQLL‘H 1 D F: n, _ 60km, . 7073.5N F ' Force: in horn-Ronda.) Pfiqwe 1’ A c. D E 8 F 3 '>‘ E 2m 9244 2:21 Forces in Vcr+icnj Pfqne. 715-7; N‘M ' ' . - "i —-3Is.3 ”-m I l 54.53.: L 7075.5 843.5?- Bemahnfl momenfl‘s 530.51 MD = 530.5I"+ 795275“ '-" 9156.4 N-M M. = 848.82‘3331 r :-' 1046.3 N-‘M 16.02%!0" m’ 45.9xlo'3m = 95.9 mm 4 ...
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