Trailer transport began in the early 1920s. The initial car train consisted of a car and a total trailer, which was less stable to travel. A car train consisting of saddle tractors and semi-trailer was later introduced as the main vehicle for carrying goods in towed transport. China began to develop trailer transport in the late 50, and by the end of 1983, there were 65% trailers and semi-trailer trailers in the National transportation system for cargo vehicles and tractors. Now a few cities are mainly used by saddle-type tractor and semi-trailer car train, and most of the provinces and cities are still mainly by car and full trailer car train.Car Trailer Carry vehicles for short-distance transportation of trackless trains. Tractors and trailers belonging to moving vehicles do not include cars, tractors and their trailers on highways. Tractors are used to tow trailers, and are sometimes used to traction other equipment, traction aircraft or air cushion handling devices. Trackless trains are evolved from narrow-gauge railway vehicles, and their transport lines can be changed, with greater flexibility, and have been developed into unmanned handling systems.Car Trailer
The structure of the transporting vehicle is complex, the driving part of the high cost and the simple bearing part are made into tow tractor and trailer respectively, and the train operation can improve the turnover of the driving part, and the towing tractor is not necessary for loading and unloading, but also can increase the carrying capacity of the bearing part and obtain the higher productivity with the same equipment investment. The tractor has a small shape and low driving speed, but its dynamic performance is good and the steering radius is smaller. Tractors and floors can be contacted 3 or 4 points. The 3-point tractor can reduce the steering radius, the maneuverability is good, but the stability is poor. All kinds of tractor are equipped with power plant, transmission device, steering device and braking device.Car Trailer
In order to enable towing tractor can realize towing, require tractor's original motive to have enough power, the drive wheel has enough torque to make the vehicle drive, also require the ground and the wheel to have enough adhesion, otherwise the driving wheel and the ground skid, the vehicle cannot drive. The adhesion is proportional to the driving wheel pressure, increasing the wheel pressure of the driving wheel, the number of driving wheels (such as the Multi-Axis Drive vehicle) can play the traction of the vehicle better. Sometimes the use of appropriate patterns of tires and tracks to replace the wheel can also achieve better results.Car Trailer
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