1.1.5.a.ak Gearspulleydrivessprocketspracticeproblems
1.1.5.a.ak Gearspulleydrivessprocketspracticeproblems
1.1.5.a.ak Gearspulleydrivessprocketspracticeproblems
All problem calculations should assume ideal conditions and no friction loss.
Gears
A simple gear train is composed of three gears. Gear A is the driver and has 8 teeth,
gear B has 24 teeth, and gear C has 16 teeth.
4. If the output of torque at gear C is 150 ft·lb, what is the input torque at gear A?
Formula Substitute / Solve Final Answer
GR out
1 in
6. The necessary torque output for the system is 500 ft·lb. What should the gear ratio
of the system be?
Formula Substitute / Solve Final Answer
GR out 5
GR 5 : 1
1 in 1
7. With a system torque output of 500ft·lb, how many teeth should gear D have?
Formula Substitute / Solve Final Answer
9. A speed of 1,750 rpm is required when the drive belt is connected to pulley B. What
is the diameter of pulley B?
Formul Substitute / Solve Final Answer
a
12.9 in.
10. A speed of 2,000 rpm is required when the drive belt is connected to pulley C. What
is the diameter of pulley C?
Formul Substitute / Solve Final
a Answer
11.3 in.
An industrial overhead door has a sprocket and chain system designed to reduce
the force needed by an operator to open and close the door. The system consists of
two individual systems that are connected through a live axle shaft. To operate the
door the operator pulls a continuous loop of chain over a fixed 22-tooth sprocket that
is attached to a live axle shaft (system 1). A second 22-tooth sprocket is attached to
the live axle shaft and uses a chain connected to a 48-tooth sprocket that is attached
to a drum that drives the door.