The core function of the torque arm (torque arm/reaction rod) on a motor is to counteract the reverse torsional torque generated during motor/gear operation, preventing the motor/gear housing from reversing, shaking, or displacing, and protecting the mounting structure and transmission components.
I. Why is it needed?
When the motor outputs torque to drive a load, according to the principle of action and reaction, an equal and opposite counter-torque is generated, attempting to make the motor/gear housing rotate in the opposite direction to the output shaft.
- Without a torque arm: the housing is prone to reversing, bolts may loosen, mounting brackets may tear, and even the motor, gearbox, or coupling may be damaged.
- With a torque arm: one end is fixed to the motor/gear housing, and the other end is connected to the equipment base, transmitting the counter-torque to the base, effectively “locking” the motor housing and allowing only the output shaft to rotate.
II. Main functions
1. Anti-reversal and stabilizing the motor housing: Completely prevents the motor/gear housing from rotating in the opposite direction, suppressing vibration and displacement.
2. Protects installation and transmission: Prevents damage to the base, bolts, and couplings due to counter-torque overload.
3. Ensures transmission accuracy: Stabilizes the machine body, reduces eccentricity and wear between shafts and gears, and extends service life.
4. Adapts to high-torque conditions: Especially suitable for worm gear reducers, high-torque geared motors, heavy-duty conveyors, mixers, and other similar applications.
III. Working Principle (Simplified Version)
Just like tightening a screw with a wrench, when the screw (load) is tightened, the wrench (motor) pushes against your hand (base); the torque arm withstands this counter-force and transmits it to the foundation, allowing the wrench to only turn the screw, not itself.
IV. Common Applications
- Industrial: Geared motors, conveyors, mixers, elevators.
- Electric vehicles: Hub motor torque arm to prevent the motor shaft from reversing and tearing the frame.
Post time: May-18-2026