Introduction of the viscous coupling type central differential
The working principle of the viscous coupling is somewhat similar to a multi-plate clutch. A plurality of inner plates are mounted on the input shaft, inserted into a plurality of outer plates in the output shaft housing, and filled with a high viscosity silicone oil, as shown in FIG. The input shaft is coupled to a shifting shifting device on the front engine and the output shaft is coupled to the rear axle. During normal driving, there is no difference in rotational speed between the front and rear wheels, the viscous coupling does not work, and the power is not distributed to the rear wheels. The car is still equivalent to a front-wheel drive car.
When the front and rear wheels of the car have a large speed difference. The silicone oil between the inner and outer plates of the viscous coupling is agitated and begins to be thermally expanded, causing great viscous resistance, preventing relative movement between the inner and outer plates, and generating a large torque. In this way, the power is automatically transmitted to the rear wheels, and the car is converted into an all-wheel drive vehicle.
Advantages: compact size, simple structure and low production cost.
Disadvantages: The disadvantage is that the reaction speed is slow, the torque distribution ratio is small, the combination and separation cannot be controlled manually, and the high load operation may fail due to overheating.