+1 vote
in Machine Kinematics by (38.0k points)
If the centre distance between a pair of spur gears in mesh is 240 mm and the pinion moves five times faster than the gear, then the pitch circle diameters of pinion and gear respectively are

(a) 40mm and 200 mm

(b) 80mm and 400 mm

(c) 60mm and 300 mm

(d) 50mm and 250 mm

The question was posed to me in a dream while sleeping

I'm obligated to ask this question of Length Of Arc of Contact in chapter Toothed Gearing & Gear Trains of Machine Kinematics

1 Answer

0 votes
by (106k points)
Correct option is (b) 80mm and 400 mm

The explanation: rp + rg = 240

rp/rg = 5

rg = 200 mm, dg = 400 mm

rp = 40 mm, dp = 80 mm.

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