The connecting rod is attached to the piston by a pin at B of diameter d1 and

Question:

The connecting rod is attached to the piston by a pin at B of diameter d1 and to the crank shaft by a bearing A of diameter d2. If the piston is moving downwards, and the coefficient of static friction at these points is μs, determine the radius of the friction circle at each connection.

Given:

d1 = 0.75 in

d2 = 2 in

μ s = 0.2