Automobile has several crossbeams, and Auto Cross Members is divided into automobile front crossbeam and is positioned at the front bumper rear, and other crossbeams of Auto Cross Members are positioned at the bottom of the car, and are connected together with chassis. The car girder is generally composed of two longitudinal beams and several cross beams, which are supported on the wheels through the suspension device, front axle, and rear axle.
The frame is generally composed of longitudinal beams and beams. There are two main forms of automobile beams: side beam and middle beam. The side beam frame is composed of two longitudinal beams on both sides and several beams. The longitudinal beams and beams are connected by riveting or welding to form a strong rigid frame.
Longitudinal beams are usually stamped from low-alloy steel plates, and the cross-sectional shape is generally groove-shaped, and some are made into Z-shaped or box-shaped. According to the different forms of automobiles and the requirements of structural layout, the longitudinal beams can be made curved in the horizontal plane or in the longitudinal plane, and have equal or non-equal sections. The beam is not only used to ensure the torsional rigidity of the frame and bear the longitudinal load, but also supports the main components on the car. Usually the truck has 5~6 beams, sometimes more. The structural feature of the side beam frame is that it is easy to install the cab, compartment and some special equipment and arrange other assemblies, which is conducive to the modification of modified vehicles and the development of various types of vehicles, so it is widely used in trucks and most special vehicles. .