Classification of transfer case
1. Transfer case without inter-axle differential
Each output shaft has the same rotational speed, and the torque distribution is related to the resistance of the drive wheel and the stiffness of the transmission mechanism. The transfer case of this structure simultaneously turns on the front drive axle when the downshift is engaged, and the front drive axle is separated from the drive train when it is hung up, so that it becomes a driven bridge to avoid power circulation and reduce the car when driving on a good road surface. Power consumption and wear of tires, etc.
2. Transfer case with differential between shafts
Each output shaft can be rotated at a different speed, and the torque distribution is determined by the differential ratio. According to this, the torque can be distributed to the respective transaxles in equal proportions according to the axial load distribution. A car equipped with such a transfer case can obtain all-wheel drive not only when the load is applied, but also when the transfer mover is high-grade, so as to fully utilize the adhesion quality and adhesion, and improve the traction performance of the car on various road surfaces. The inter-axle differential eliminates the power cycle of a multi-bridge drive car, but it reduces the car's anti-slip capability, so it is often necessary to install a differential lock.
3. A transfer case with an overrunning clutch
The difference between the front and rear wheels is used to automatically connect the front drive axle when the rear wheel slips, and the other overrunning clutch when the reverse gear is used.