Car transmission system transfer box

What is the use of 1?


The transfer case is a device that distributes engine power and can output power to the rear axle or both front and rear axles. In the four-wheel drive mode, the front and rear axles are rigidly connected and can achieve 50:50 power distribution. The transfer case with "low-speed four-wheel drive" mode can achieve the effect of amplifying the torque by adjusting the gear ratio. It is very beneficial to improve vehicle passability.

2 Did you know?


· In the 4WD mode, when the differential lock is turned on, the wheel speed is fixed at the right, left, and right sides when turning on a good paved road. This can result in the phenomenon of “competitiveness”.

• Most transfer cases do not have a synchronizer, so switching between drive modes requires a stop switch.


3 advantages:


· Switching to a two-drive mode on flat roads can save fuel.

The pure mechanical structure is very reliable.

· Improve the car's passability.

4 Principle:


In the case of vehicles equipped with transfer cases, we will see a transfer case stop with 4H (2W), 4H (4WD), N (Neutral), and 4L (low speed, high-torque 4WD). Gears. The transfer case is an output terminal on the gearbox and transmits power to the output shaft of the front axle through the silent chain. When we pull the transfer box stop, the power and the front drive shaft are switched on and off to switch between the two drives and the four-wheel drive.

Transfer case “low-speed four-wheel drive” gear is used to achieve torque change through another set of gears with larger gear ratios in the transfer case (such as the variable-speed bicycle in our lives, which achieves “variable speed” by changing the front and rear gear ratios. ") In some cases of steep slopes or poor road conditions, the driver can manually enter the "low-speed four-wheel drive" gear to change the torque to help escape difficulties.

5 Extended reading:


The "superselected four-wheel drive transfer case" is what Mitsubishi calls it. It is also a time-division four-wheel drive transfer case. Its structure is similar to an ordinary time-sharing four-wheel drive transfer case, but it requires a central differential. When it comes to 4H, it will not only be able to drive at high speed on gravel roads, but also realize the function of highway four-wheel drive on ordinary roads. The 4HLC and 4LLC options it provides are the four-wheel drive mode with the central differential lock locked. At this time, it is the same as the 4H and 4L functions in the ordinary time-sharing four-wheel drive. At present, Mitsubishi SUVs use such transfer cases.


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