Transfer box: Construction, Working

Transfer box: Construction, Working

A transmission case is a part of a 4-wheeled drive system used in all-wheeled and four-wheeled vehicles. The transmission case is connected via a drive shaft to the front and rear axles.


  • The input shaft is attached to the transmission box and has an axial teeth on it.
  • The shaft can be rotated independently of two input shaft gears. Each gear has bosses on the side, which have the same tone as the central part on the inlet shaft with their axial teeth.
  • The central part and therefore the input shaft can be attached to either a small gear or a large gear depending on how the transfer box heave is shifted.
  • Two shafts are located, one to the front axle and the second to the rear axle.
  • In the rear output tube, which is directly connected to the output gear, the front output wave has a less diameter.
  • The front output shaft has a mechanism for shifting it and has splines over a small length which link the two shafts rotatively together when connected with the corresponding inner splines of the rear output shaft.


  • When the shifting mechanism A is in the center, so that no equipment is connected to the input shaft, as shown in figure i, the drive is neutral.
  • Fig.ii demonstrates when a system A links the input wave to the large input ring, but B disconnects the front output from the rear output wave. The two-wheel drive is obtained in this position with a high gear.
  • Similarly Fig.iii demonstrates the four-wheel drive condition in low gear.

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