A car differential is a mechanism that allows 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. Its function is to allow the left and right wheels to roll at different speeds when the car is turning or driving on uneven surfaces, ensuring that the drive wheels on both sides perform pure rolling motion. The differential is installed to adjust the speed difference between the left and right wheels. In four-wheel drive, to drive all four wheels, they must be connected. If all four wheels are mechanically connected, the car cannot rotate at the same speed when navigating curves. To allow the car to maintain a consistent rotational speed while cornering, a central differential is added to adjust the speed difference between the front and rear wheels.
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