Mechanical Design

May 12th, 2015
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1. The 18-tooth pinion (#2) (Figure 1) drives a double-reduction gear train. Gears 3 and 4 are on same shaft. All gears have a 200 pressure angle. The pinion rotates CWat 1200 rpm and transmits 30 hp to the gear train. All gears are through hardened, milled from AISI 4140 Q&T at 10000 F, and have a face width of2.50 in

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Test 3 Mech DesignMEE 427: Mechanical DesignSpring Term 2009-10Test III1. The 18-tooth pinion (#2) (Figure 1) drives a double-reduction gear train. Gears 3 and 4 are on same shaft. All gears have a 200 pressure angle. The pinion rotates CWat 1200 rpm and transmits 30 hp to the gear train. All gears are through hardened, milled from AISI 4140 Q&T at 10000 F, and have a face width of2.50 in. Calculate (a) the diametral pitch (Pd) and pitch radii (R) of gears 2,3,4, and 5 (using the number of teeth and shaft center distances) and (b) the lowest factor of safety for the infinite life of the gear train using the bending fatigue and Gerber criteria. Use a Pd of3 irrespective of your answers in part (a).n 2., LOO rrM H p::. ?::C> hP':.).B:t;z.rJ.~F -= 2. ~.J_~+ 2PJ "'")& -1d=-3PtAJ-'1,riTo drivenmachineProblem # 1 cont ...(b)~~:::"-11.- = 20b:!J::(1:2n:sn'L ::- lz.ooq>rrt=: ~"'3HP-= sO krn:1::: 1100 f'f1V\";:: ()f -::2.5I.f0lA ~ 13'bkrs;2. Figure 2 shows the model of a shaft machined from AISI 4140 steel Q&T at 10000 F. An axial load P varying from 250 - 1900 Ib is applied at the disk. For infmite life of the bar, determine the fatigue factor of safety (nr) for the section 'A' using the Gerber theory. Given that (Kr)bending 1.70 and (Kr)axial 1.8. ==(30)1: ~ !qo::; Ib"'I..\l(CZi2-Slb~.~,,J\I,I.' DJIJ -'12.50Figure 2M,,- ~M/YI:::(BZS)(2. $) ~ 2-a~ oz.)(1~7S)(2.S

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