Mechanical design transfer box

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The control unit for the transfer box (VTG) is attached below at the servomotor for the multidisc clutch.

The design of the multidisc clutch was changed slightly.

A motor position sensor is located in the servomotor. The motor position sensor detects the position of the servomotor and informs the transfer box control unit of the position.

Fig 1: Identifying Servomotor Multidisc Clutch And Control Unit Transfer Box

Courtesy of BMW OF NORTH AMERICA, INC.

ATC 350 transfer box shown

Item	Explanation
1	Connection front axle
2	Multidisc clutch
3	Connection to rear axle
4	Control unit transfer box (VTG)
5	Servomotor multidisc clutch

A temperature sensor in the VTG control unit monitors the power output stage for the servomotor. This protects the servomotor from thermal overload. Any thermal overload of the servomotor is signalled by a Check Control message. The transfer box moves temporarily into its open position. This disconnects the multidisc clutch. Once the servomotor has cooled down, the multidisc clutch can be operated again (preconditions: DSC must request once-only 0 Nm locking torque).