Question

Desgin

0.2) Figure Q.2 shows a drive system in which a 20-hp electric motor drives separate output shafts. Gear A is mounted on the motor shafit that has a rotational spoed or 1750 rpm clockwise. Gear A drives gear train consisting of…B,C,and D thr deliver power through the shafts on which they are mounted. All gears have a diametral pitch of Pa-8.The following data are given Power delivered by gears B, C, and D: Pa Numbers of teeth for all gears: Na -24,N Determine the following of the drive system 48, Nc=96, NO-24 a. The pitch diameter of each gear. b. The center distance of each gear mesh e. The rotational speed of each output shaft, and the overall velocity ratio from A to D. d. The torque through each output shaft. e. The tangential force on the teeth of each shaft CD through a set of bevel gears contacting at E on the gear of shaft CD iBs 1600j+3600k N. For shaft CD: (a) draw a free- in the supports (assume load), (b) perform a preliminary specification for the bearing set, assuming distribution data from body diagram and determine the reactions at C and D assuming also that bearing C carries the thrust tapered roller bearings at C and D. A bearing life of 10 revolutions percent combined reliability for manufacturer I. 1. Assuming bearings are available with K 1.5, find the required radial rating for each bearing. For this preliminary design, assume an application factor of one. 165 100 mm 75 mm 20 mm dia. 33 mm 100mm ←2S mm dia.

Answer 1

0 solu hon Given da ta, voto honal Speed f 0 ipm power de liveyd by Numbes af fce th fo alt gers NCG 0 pîtch dia meler of each gear;- we have Ar Pd

2, Td 3y2s. dl bcenvral dísan ie af eath geas mh oc have module D 르.ar[1t

313 TBT 2 Bc פ 2.29.6 m A- TA A TA тв

Tk 2000 20 power - 드 POQeY 13Nm 2.TT ne TcPcb 20 35N