Painted metal mounting frame for vehicle

Frame overview: The frame is a frame structure that spans the front and rear axles of the car. It is commonly known as the girder and is the base body of the car. It is generally composed of two longitudinal beams and several cross beams, and is supported on the wheels through the suspension device, front axle, and rear axle. The frame must be strong and stiff enough to withstand the load of the car and the impact from the wheels. The function of the frame is to support and connect the various assemblies of the car, so that each assembly maintains a relatively correct position and withstands various loads inside and outside the car.

Frame function and layout requirements: Most modern cars have a frame that serves as the skeleton of the entire vehicle. Most of the components and assemblies of automobiles are fixed through the frame, such as engine, transmission system, suspension, steering system, cab, cargo box and related operating mechanisms. The frame plays the role of supporting and connecting various parts of the car, and bears various loads from inside and outside the car.

The structural form of the frame should first meet the requirements of the general layout of the car. During the complex driving process of the car, there should be no interference between the various assemblies and components fixed on the frame. When a car is driving on a rough road, the frame may undergo torsional deformation and bending deformation in the longitudinal plane under load; when one wheel encounters an obstacle, the entire frame may be twisted into a diamond shape. These deformations will change the relative position between the components installed on the frame, thus affecting their normal operation. Therefore, the frame should also have sufficient strength and appropriate stiffness. In order to improve the lightweight level of the entire vehicle, the frame mass is required to be as small as possible. In addition, the frame should be arranged closer to the ground to lower the center of gravity of the car and improve the driving stability of the car. This is especially important for passenger cars and cars.

Early design: Most of the frames used in early automobiles were composed of cage-shaped steel beams and columns, that is, on two parallel main beams, many secondary beams connected to the left and right were added in a ladder-like manner. manufactured. The car body is built on the frame. As for the door, sandboard, hood, trunk lid and other sheet parts, they are additionally covered outside the car body. Therefore, the car body and the frame are actually two independent parts. structure. The biggest advantage of this design is that it can take into account both lightweight and rigidity, so it is favored by many sports car manufacturers. Early Ferraris and Lamborghini both adopted this design. Since the frame with steel frame design must connect the main beam and sub-beam through many joints, and the cage-like structure cannot free up a large space, it is not only complicated to manufacture and not conducive to mass production, but also not suitable for use. On a four-door RV that emphasizes the sense of space. Therefore, the monocoque structure frame has gradually become the mainstream in the car industry, and the cage-shaped steel frame has gradually been replaced by this monocoque frame that combines the car body and the frame into one (such as: container trucks ), the single frame is generally called "chassis", which is derived from the English "Platform".