Introduction of working principle of automobile
The car's transfer case is fixed on the frame. After the transmission, it is the same as the transmission. It is also a gear transmission system. It can also be said to be a sub-transmission. Generally, the transfer case is equipped with high and low gears. The purpose is to further expand the number of gear ratios and gears when driving in difficult areas. The transfer case can redistribute the power output from the transmission to each axle, further increase the torque, and enhance the ability to climb and escape. The working principle of the transfer case: Each shaft of the transfer case is supported by two tapered roller bearings, and the tightness of the bearings is adjusted with corresponding adjustment pads. The input shaft of the transfer case is connected to the two shafts of the transmission directly or through a universal joint (universal transmission device), and the output shafts are respectively connected to each drive axle through a universal joint (universal transmission device). Several can be set. In order not to overload the rear drive axle, an interlocking mechanism is provided. Only after engaging with the front axle can low-speed upshifts be engaged. That is, the front axle must not be engaged without engaging the front gear, and the low axle must not be withdrawn before removing the front axle. Use of transfer case: When off-road vehicles are driving on a good road, in order to reduce power consumption and wear of driveline parts and tires, the power to the front axle is generally cut off to ensure the stability and fuel economy of the vehicle at high speeds and turning. When driving off-road, if it is necessary to hang a low-speed power block, in order to prevent the rear axle and the middle axle from being overloaded, the low-speed power should be shared by all drive axles. Common faults of transfer case are: The crankshaft is not concentric with the first shaft, the bearings are abnormally worn, there are problems with the meshing teeth and there is no pair replacement when replacing, which causes neutral noise. Improper gear replacement, differential gear or half shaft gear key slot wear and loose, the main and passive gear clearance is large or the passive bevel gear is loose, and the gear will ring after overdrive. Oil shortage or high oil viscosity, overheating caused by over-tight bearings and small gaps between gears. The gear shift slide interlock pin is abnormally worn or the control spring compression is not up to the standard caused by the disorder. Jumping phenomenon caused by failure of positioning device or severe gear wear.