What is the difference between a differential and a final drive?

1 Answers
Joann
07/29/25 3:30pm
Difference between differential and final drive: Different definitions: The differential refers to a mechanism that enables the left and right or front and rear drive wheels to rotate at different speeds. It mainly consists of left and right axle gears, two planetary gears, and a gear carrier. The final drive refers to a component in the drivetrain that reduces speed and increases torque. When the engine is longitudinally mounted, it also serves to change the direction of torque rotation. This is achieved by using a gear with fewer teeth to drive a gear with more teeth, thereby achieving speed reduction. Different functions: The function of the differential is to meet the requirement of different wheel speeds when the car is turning. During a turn, the inner and outer wheels have different turning radii, with the outer wheel having a larger turning radius than the inner wheel. The function of the final drive is to change the direction of power transmission and, as an extension of the transmission, to provide a common gear ratio for all gears. The transmission outputs torque that rotates around the longitudinal axis, while the wheels must rotate around the vehicle's transverse axis. Therefore, a device is needed to change the direction of power transmission.
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