Since the outer wheel in the direction of rotation moves more than the inner wheel when the car is cornering, the number of revolutions of the left and right wheels is inevitably different. A differential gear (differential gear) is a device that helps smooth turning by adjusting and controlling the driving force of the left and right wheels in such a situation. However, when one wheel idles due to the operation of the differential gear on a road surface with low friction, such as a snowy or muddy road, the other wheel does not slip. An improvement on this is LSD (Limited Slip Differential). The LSD is a device that limits the difference in wheel rotation speed to a certain level or less and prevents a situation in which power is concentrated on a specific wheel. Through this, when the difference in rotation speed between the left and right wheels exceeds a certain level, the driving force is distributed to the wheels with the lowest rotation speed to help stable driving. In addition, the electronic Limited Slip Differential (e-LSD), which electronically controls the multi-plate clutch in detail depending on the situation, is being applied to vehicles that emphasize driving performance, such as high-performance vehicles.