Non-loadable body and load-bearing body has advantages and disadvantages, the use of cars in different uses. In general, non-bearing body used in trucks, buses and off-road vehicles, carrying the body is generally used in the car. Body shell in accordance with the force can be divided into non-load, semi-load and load-bearing body three. Non-bearing body and bearing body according to whether the rigid frame division, what is the frame, is the first to clarify the problem. The frame is the base of the support body, commonly known as the chassis beam. The engine, the transmission, the steering gear and the body part are fixed on it, which in addition to the static load but also bear the dynamic load generated when the car is running, so the frame must have sufficient strength and stiffness to ensure that the car in normal use Under various stress will not damage and deformation. Frame with side beam, steel pipe and other forms, which is the most widely used beam side frame. Side beam frame by two long stringers and a number of short beams riveting or welding forming, longitudinal beam bearing the main load, generally with a large bending strength of the groove-shaped steel beam. There are also steel pipes used, but are mostly used on light frames. Generally, the longitudinal force of the longitudinal beam is the largest, so the designer generally increases the cross section height of the middle part of the longitudinal beam, and the cross section height decreases gradually at both ends, so that the stress distribution can be uniform and the weight is reduced. Non-loadable body trapezoidal frame beams are grooved, tubular or mouth-shaped to ensure that the frame of the torsional stiffness and bending strength.
The beams are also used to install engines, transmissions, body and fuel tanks. In order to adapt to different models, beams are arranged in a variety of types, such as in order to improve the torsional rigidity of the frame using X-type layout of the beam. Side beam structure is simple, low process requirements, easy to manufacture, widely used. But because of the thick beam through the whole car, affecting the vehicle layout and space utilization, the cross section of the beam height to increase the distance from the distance, the passengers on and off the car is not convenient, the other weight is also large, vehicle driving economy deterioration The These shortcomings on the small bus, the car is a disadvantage, for off-road vehicles may be the advantage, because the off-road vehicles require a strong pass, driving rugged road to have a certain large ground clearance, and very bumpy road will make the body Drifting, only with a rigid frame of the load-bearing body structure to withstand this impact. So off-road vehicles commonly used non-load-bearing body.
