Question

A four-strand no. 40 roller chain transmits power from a 21-tooth driving sprocket to an 84-tooth driven sprocket. The angular speed of the driving sprocket is 2000 rev/min. A life of 20 000 hours is desired.

1. Estimate the allowable horsepower H2 from Equation (17–39), which is a broader version of Equation (17–33) that allows for adjustment for life and length.
2. Estimate the average chain velocity in feet/minute.
3. Estimate the torque that is transmitted from the driving sprocket when operating at the maximum allowable from part (a)
4. Estimate the tension in the chain when operating at the maximum allowable power from part (a).

Book used: Shirley’s Mechanical Engineering Design (9th Edition)

Answer 1