Answer to Question #200264 in Mechanical Engineering for Muhammad Idrees

Question #200264

In a reverted gear train, as shown in Fig. 13.32, two shafts A and B are in the same straight line and are geared together through an intermediate parallel shaft C. The gears connecting the shafts A and C have a module of 2 mm and those connecting the shafts C and B have a

module of 4.5 mm. The speed of shaft A is to be about but greater than 12 times the speed of shaft B, and the ratio at each reduction is same.

Find suitable number of teeth for gears. The number of teeth of each gear is to be a minimum but not less than 16. Also find the exact velocity ratio and the distance of shaft C from A and B.

Expert's answer

Velocity ratio required between A and B = 12

Also Take

Module for gear 1<2 mA =2

Module for gear 3<4 mB =4.5

Consider gear that has higher module

Take Z3 (number of teeth on pinion 3) =20

Diameter (pitch) of gear 3

Pitch diameter of gear 4

Center distance

Consider gear 1 and 2

Hence gear 1= 45; gear 2= 153; gear 3= 20; gear 4= 68

Center distance ,

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