Question 2: What's the difference between a circular tube beam and a frame plate beam? The main stress direction of the frame beam is perpendicular to the direction of the car body, but at the same time, due to the different frame structures, it bears horizontal or other shear forces. The metal plate driver is basically a channel steel structure. From the moment of inertia, it is not a closed cavity, and the shear and bending directions are incomplete, while the circular beam is a closed cavity. At the same time, the difficulty of forming is that the general frame beam does not involve hydraulic forming, and the process is relatively simple, while the metal plate beam is. Humble opinion! ! !
Question 3: What is a girder vehicle? Concept introduction
In the automobile parameter configuration table, the chassis structure is generally divided into two types: load-bearing and non-load-bearing
Cars with non-load-bearing bodies have rigid frames, which are also called chassis girders. Such a framework usually
Non-load-bearing body is rectangular or trapezoidal, which is arranged at the bottom of the body and can't be seen at ordinary times.
Non-loaded body structure is a chassis form with a long history, which was adopted by almost all cars in the early days. 100 years ago, cars were still in the era of customized cars. When people buy a car, they will first choose the chassis, and then on the basis of the chassis, they will choose different body manufacturers to customize different styles of bodies.
Edit the specific structure of this paragraph.
The frame of non-load-bearing car body is a rectangular structure composed of many cross beams and longitudinal beams. The frame carries the whole car body, and the engine, suspension and car body are all installed on the frame, and the frame is connected with the wheels through the front and rear suspension devices. The frame is provided with a screw hole for fixing the car body and a base for fixing the spring. So theoretically, even if there is no body, there is no problem with a single frame. The function of the car body is to provide a comfortable and safe environment for drivers and passengers and improve their aesthetics.
Non-load-bearing body structure
Frame has many forms, such as edge beam type and steel tube type, among which edge beam type is the most widely used one. The side beam frame is formed by riveting or welding two long longitudinal beams and several short cross beams. The longitudinal beam mainly bears bending load, and generally adopts channel steel beam with large bending strength. Steel pipes are also available, but they are mostly used for light frames. Generally, the middle part of the longitudinal beam bears the greatest stress, so designers generally increase the cross-sectional height of the middle part of the longitudinal beam and gradually reduce the cross-sectional height at both ends, which can make the stress distribution uniform and reduce the weight at the same time.
The body of the non-load-bearing body is hung on the frame and connected by elastic elements.
Edit the geometric features of this section.
superiority
First, the car body has high strength, and the steel frame can provide strong car body rigidity. This is very important for trucks and off-road vehicles. The feedback of suspension on road bumps is much lighter in the car. This is because the body and chassis of some cars are connected together through vibration reduction, so it is more stable and comfortable to walk on bumpy roads.
Second, there are independent girders, and the chassis strength is high. Generally used in trucks, buses and off-road jeeps, but also used in some luxury cars, because it has good stability and safety.
Three or four wheels are unevenly stressed, which is also borne by the frame and will not be transmitted to the body. So SUVs and off-road vehicles are used more. Non-fully loaded car bodies are widely used in public transport enterprises in China.
Fourthly, the car body and the frame are connected by elastic elements, which has a certain cushioning and shock absorption effect. When driving on the expressway, you will feel more stable.
disadvantaged
First, when encountering danger (such as rollover), a heavy chassis will also pose a fatal threat to a relatively weak body.
Second, the weight is heavy, the frame itself is very heavy, and the body and the frame are two independent parts, so the overall weight is greater, more steel is used, and the cost is higher.
Third, the center of mass of the car is high. The center of gravity of the vehicle is higher than that of the heavy-duty vehicle. The frame is at the bottom, and the car body is installed on the frame, so the floor of the car body should be above the frame anyway.
Edit the technical development of this paragraph.
Most bus factories in China are developed from the original automobile refitting factory, and the bus chassis is a production platform based on truck chassis. Major manufacturers also copy the mature products of the original trucks, and there are no products specially developed for the characteristics of passenger cars. Therefore, the chassis structure of China bus products is still a non-loaded body without imported bus products. According to the characteristics of passenger cars, the traditional truck chassis is changed into a three-section chassis to meet the needs of passenger cars. Based on this, the torsion legs of the girder are welded according to the structural requirements to form a semi-loaded body of the bus.
With the development of 100 years, the load-bearing car body has gradually become specialized and the technology has become more and more mature. The load-bearing body after weight reduction becomes the special chassis of high-end SUV. Both Volkswagen Touareg and Mercedes-Benz GL use load-bearing bodies to improve their ability to cope with bad road conditions. At the same time, off-road vehicles with non-load-bearing bodies are also being passed down. After years of accumulation, a number of old-fashioned off-road vehicles such as Mercedes-Benz G-Class, Jeep Shepherd and Toyota Cool Road FJ are still developing.
Edit the structural features of the car body in this section.
Cars with non-load-bearing bodies have rigid frames, which are also called chassis girders. The car body is suspended on the frame and connected by elastic elements. The vibration of the frame is transmitted to the car body through the elastic elements, and most of the vibration is weakened or eliminated. If there is a collision, the vehicle will crash ... >; & gt
Question 4: The difference between axle, frame, car body and frame is the installation foundation of all parts on the car, which usually consists of longitudinal beam and cross beam, connecting all parts of the car and bearing various loads from inside and outside the car; For example, the engine, transmission and car body are installed on the frame through elastic support; The front axle and the rear axle are connected to the automobile frame through a suspension; The steering gear is directly installed on the frame. Chassis includes four systems: transmission system (engine and motor transmit power), running system (supporting the weight of the whole vehicle to realize walking), steering system (controlling the running direction of the car) and braking system (the main function of controlling the running speed of the car). Without an engine, there would be a car, and now there is a pure electric vehicle (EV). There is also a hybrid electric vehicle (HEV) equipped with two kinds of power sources. It can also be considered that hybrid vehicles usually refer to vehicles with both batteries and relatively small internal combustion engines.
Question 5: Why do bicycles have beams? The design of the frame ensures the triangular structure of the frame and provides sufficient strength.
Avoid the seat bar being lifted too high, the lever that the seat cushion acts on the seat bar hoop is too long, and the pressure on the seat bar hoop and the seat bar part of the frame is too great, resulting in damage.
Different sizes adapt to different data such as height and leg length.
Have a nice trip!
Question 6: What is the X-shaped high beam in the car frame and what is its use? The side beam frame is a solid rigid frame composed of two longitudinal beams and several cross beams on both sides by riveting or welding. There is only one longitudinal beam in the center of the center beam frame, which runs through the whole length of the car. It is also called spine frame.
Question 7: How many types of frames are there? The frame is the matrix of the car. Generally, it consists of two longitudinal beams and several transverse beams. It is supported on wheels through suspension device, front axle and rear axle. It is the basic component that supports the car body and bears the load of the car. Most parts and components of the car are fixed by the frame. The frame is generally composed of longitudinal beams and cross beams.
At present, the structure of automobile frame can be divided into three types: side beam type, platform type and spine type. Among them, the platform frame is suitable for small cars or trucks; The backbone frame is suitable for trucks or cars with independent suspension; Side beam frame is the most widely used.
Question 8: How to determine the position of the cross beam of the automobile frame? Is there a great god? Or have you ever made a template for frame design? I am very grateful ~ ~ I tied the rear wheel with two long hard rods and came out straight.
Question 9: What is an automobile longitudinal beam? As shown in the figure, there are both longitudinal beams and transverse beams.
Structure of automobile frame
1. The side beam frame consists of two longitudinal beams and several cross beams.
2. Connect the longitudinal beam and the cross beam into a solid rigid frame by riveting or welding.
3. This kind of side beam frame is mostly used for trucks.
4. The longitudinal beam is made of low alloy steel plate. The cross section is trough-shaped. Or I-shaped, also caused the box section.
5. The transverse valve not only ensures the torsional rigidity of the frame and bears the longitudinal load, but also supports the main parts of the automobile. The average truck frame has 5-6 beams, or even more.
Question 10: What is the pipe on the frame?