Differential is composed of six gears, planetary gear + two = four gear two axle gear, there are two. The remaining two gears with the drive rod is responsible for connecting the engine output power, gearbox and drive shaft after a smooth transition to the differential, then the differential will be based on the actual situation to the power distribution left and right rear wheels. Only differential installed in the rear axle drive rod between the two can achieve reasonable control wheel speed, in order to achieve the speed of two wheels with different purposes. In this six gear installed to the appropriate location, can not let them exposed it, still need a safe shelter to protect shell to protect the gear position is not affected by other parts of the interference. To save space, modern differential rarely use the classic flat gear, and more is to use the song bevel gears, screw gears, hypoid gears or worm, but the basic structure of the six gears have been continued down.
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