A tractor is a general large truck or semi-trailer that is towed between the front and the trunk by a tool, that is, the front of the truck can be detached from the original trunk to tow other trunks, and the trunk can also be pulled from the original front by the other front . The front vehicle with driving capability is called a tractor, and the rear vehicle without driving capability is called a trailer. The trailer is towed by a tractor. There are two ways to connect the tractor and the trailer: the first is that the front half of the trailer is placed on the traction saddle above the rear section of the tractor, and the bridge behind the tractor receives part of the weight of the trailer, which is the semi-trailer; The first is that the front end of the trailer is connected to the rear end of the tractor. The tractor only provides forward pulling force and drags the trailer away, but does not bear the downward weight of the trailer. This is full suspension.
In the market, tractors are mainly divided into two categories: full trailers and semi-trailers. 1. Semi-trailer tractor: The front half of the trailer is placed on the traction saddle above the rear section of the tractor. The bridge behind the tractor bears part of the weight of the trailer. 2. Full-trailer tractor: The front end of the trailer is connected to the rear end of the tractor. The tractor only provides forward pulling force and drags the trailer away, but does not bear the downward weight of the trailer.
According to whether its support can move, it is divided into fixed type, mobile type and lifting type. The left and right two supports of the fixed traction base are fastened to the traction base by bolts, and the base of the traction base is then fixed to the beam of the tractor. Fixed is the most widely used one. There are many types of mobile traction seats, and the structure is almost the same as the fixed type. The main reason is that the connection between the traction seat base and the tractor beam adopts a porous or toothed design. Smooth connection with different trailers. Some mobile traction seats are also equipped with an automatic air pressure control device, which can push the traction seats forward and backward in the chute by air pressure. The lifting traction seat is mainly used on the tractor of the port terminal. The traction seat can be moved up and down to a certain extent to adapt to semi-trailers of different heights.
According to the degrees of freedom, there are single and two degrees of freedom. The single-degree-of-freedom traction seat is also called a uniaxial traction seat. It can only make a vertical tilt of about 80. This type of traction seat has high driving stability and is suitable for semi-trailers with high speed, light load and high center of gravity traveling on better roads. The disadvantage is that because it cannot swing laterally, the frame bears a large amount of torque. The two-degree-of-freedom traction seat is also called a two-axis traction seat. It can make lateral and longitudinal swings, and can protect the frame of heavy-duty transport tractors under different road conditions. Generally, the double-axle traction seat is much higher than the single-axis type, and its lateral stability is not good during turning of the vehicle at high speed. Therefore, this type of traction seat is rarely used in ordinary road transportation.
1. Anti-slip: Prevent the idling of the drive wheels when driving on wet roads such as snow, so that the vehicle can start and accelerate smoothly. Especially on snowy or muddy roads, the traction control system can ensure smooth acceleration performance to prevent the vehicle from moving laterally or tailing due to the slipping of the driving wheels.
2. Flexibility: When the car is towed, the vehicle train has better mobility flexibility.
3. Reliable work: ensure that the traction car and trailer are connected reliably, conveniently and quickly.
4. Stability: The traction can be smoothly transmitted to the trailer, which has a certain buffering effect on the impact load.
It is often used for the transportation of large quantities of goods in or between workshops, such as the transportation of automobile manufacturing warehouses to assembly lines, and the transportation of luggage at airports.