Binding of drive shafts and
axles in part time 4WD systems, also called "axle wind up"
© 1997-2005 H. Pietschmann
How a need for more torque is handled by a 2WD and a 4WD
Task: A steep grade needs to be climbed
and 220 units of torque are required to move the vehicle.
The 2WD vehicle utilizes only the traction
of two tires which provide a total of 200 units of traction. They are "overpowered"
by the 220 units of torque, resulting in two spinning tires. The 2WD vehicle
cannot climb the grade.
The 4WD vehicle utilizes the traction of
four tires which provide a total of 400 units of traction. They can easily
handle 220 units of torque, with a safety of 180 traction units left(45
per wheel) . The 4WD vehicle climb the grade without slipping or sliding.
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