Transfer box (or razdatka) - is an integral part of each wheel drive vehicle.Its function is to distribute the torque (hereinafter, CM) along the axes of the machine as well as to increase it when traveling on a poor road or roads.
distributing box has the following device:
- leading shaft transmits torque (hereinafter CM) from the gearbox to the transfer box;
- locking center differential of the need for the distribution between the two axles KM;
- mechanism, inter-axle differential lock, provides a strong link the front and rear axles.Blocking is carried out manually or automatically;
- transmission chain (or dental), rear drive shafts and front axle transmission is reduced.
To realize the full potential of the machine wheel drive mechanism is used, inter-axle differential lock, ie partial or complete it off.Modern mechanisms of automatic lock the center differential - a multi-plate friction clutch, a limited slip differential and viscous coupling.
Viskomufta (another name - viscous coupling) - this is the most inexpensive and simple device.Her work is based on the appearance of a blocking element at a speed difference of the axes.The transfer case is often equipped with viscous coupling.
differential self-locking is a special design, which consists of a worm gear - driven and leading.Lock becomes possible due to the friction in the worm gear.Since this differential has limited strength, it does not apply to off-road.
friction multi-plate clutch distributes the CM between the axles, depending on external conditions.This CM is redistributed to the axle that has the best grip.In order to provide a transfer case clutch can be equipped with a hydraulic or electric actuator and electrical system management.
forced lock (or manual) is possible only with the help of the driver.In this case, a hydraulic, electric or mechanical drive.
chain transfer function is to transfer the Cabinet on the front axle of the machine.It includes a driven and driving gear wheels and chain drive.Instead of a chain, transfer case can be equipped with a cylindrical gear transmission.On modern machines, reducing gear looks like a planetary gear.
On some vehicles with 4x4 it is possible to connect the front-wheel drive manual (for example, transfer case UAZ).Some designs have a continuous drive system with the ability to turn off the front axle.
Transfer box can operate in several modes: included rear axle;Both machines include bridge;both work at the bridge axle differential lock;operate both bridges on the transfer decreases with differential lock;both work with the self-locking differential bridge.
mode switches with lever, rotary switch or button on the panel.
