Question

The Davis steering gear is not used because

(a) it has turning pairs

(b) it is costly

(c) it has sliding pair

(d) it does not fulfil the condition of correct gearing

I had been asked this question by my school teacher while I was bunking the class.

My query is from Mechanisms with Lower Pairs in section Mechanisms with Lower Pairs of Machine Kinematics

Answer 1

The correct option is (b) it is costly

To explain I would say: Though the gear is theoretically correct, but due to the presence of more sliding members, the wear will be increased which produces slackness between the sliding surfaces, thus eliminating the original accuracy. Hence Davis steering gear is not in common use.