Breakaway Torque

Breakaway torque refers to the amount of force or torque required to overcome static friction and start the rotation of a stationary object.  This term is commonly used in mechanical engineering and physics, especially when dealing with rotating machinery, such as engines, gears, or bearings.  When an object is at rest and you want to set it in motion, you often have to apply a greater force or torque initially to overcome the static friction that is preventing it from moving.  Once the object starts moving, you typically need less force or torque to keep it in motion, which is known as kinetic friction.

Breakaway Torque is Crucial in Various Applications

Automotive  -  Breakaway torque is relevant when starting a car engine.  The starter motor must provide enough torque to overcome the static friction within the engine and get it turning.
Bearings  -  Bearings in machinery also have a breakaway torque.  This is the torque required to initiate the rotation of the bearing components.
Gears  -  When engaging gears in a transmission system, there is a breakaway torque required to start the rotation of the gears.
Robotics  -  In robotics, understanding breakaway torque is essential for designing robotic joints and ensuring that the motors have enough power to initiate movement.

To calculate breakaway torque, you typically need to consider factors such as the coefficient of friction between the surfaces in contact, the normal force pressing the surfaces together, and any additional resistance or constraints present in the system.  Accurate calculations can help engineers and designers select appropriate motors, gear ratios, and other components to ensure reliable performance in various mechanical systems.