What are the advantages and disadvantages of a non load bearing body

The non-load-bearing type is more than the load-bearing type, and the body is composed of metal structural parts and large covering parts, while automobile safety mainly depends on the design level of the metal structural parts of the body.

The collision of two cars cannot only be the chassis force, for example, if you collide with a truck, the chassis is higher than you, what is the use of your chassis girder?

Of course, in the collision of two cars with similar chassis height, the destructive ability with girders is stronger, in this case if the body structure design level of the two cars is about the same, then the non-load-bearing type with girders will have an advantage.

However, the non-load-bearing chassis has a higher center of gravity, which is more likely to cause rollovers and loss of control accidents, especially on the highway.

In fact, the statistics of North America also show that the accident mortality rate is lower than some cars with excellent body design, if the non-load-bearing type is really safer, why do the top luxury cars that should pay attention to safety do not use the non-load-bearing chassis?

In fact, the discussion of car safety should be for the body structure design, Mercedes-Benz's Bill Barnyi invented the safety body patent, but also for the design of automobile structural parts, the original integral body structure changed into the front parking space stress collapse area and the body rigid passenger area.

And the load-bearing type and non-load-bearing type are actually the concept of the chassis, and it is too unprofessional to say that the body is too unprofessional.

What is a load-bearing body and a non-load-bearing body, fifty seconds will tell you.

The advantages of the non-load-bearing body are that it has independent girders, high chassis strength, and good anti-bump performanceIn addition, no matter how uneven the force on the four wheels is, it is also borne by the frame and will not be transmitted to the body.

The disadvantage is the weight of the body. Since the body load is not considered in the design calculation, it is necessary to ensure that the frame has sufficient strength and rigidity, resulting in an increase in the weight of the whole vehicle. And the frame is the largest and most massive part of the car, which must have a series of complex and expensive manufacturing equipment, and the cost is relatively high.

Secondly, the center of gravity is high. The center of gravity of the vehicle is higher than that of the load-bearing type. The frame is at the bottom, and the body is mounted on the frame, so the floor of the body should be above the frame anyway.

In the event of danger (such as overturning), the heavy chassis will also pose a fatal threat to the relatively weak body.

Features of non-load-bearing body structure.

Same as the total length of the vehicle, the relative body is independent, plays the role of a skeleton, and is welded for thick steel plates. Chassis parts (engine, suspension, etc.) are mounted on the frame. The body, made of thin sheets, was mounted on the frame with the help of rubber blocks.

In addition to the cushioning and vibration absorption effect of the tire and suspension system on the whole vehicle, the flexible rubber pad can also play a role in auxiliary cushioning, properly absorbing the torsional deformation of the frame and reducing noise, which not only prolongs the service life of the body but also improves the ride comfort, and is widely used in high-end cars and some intermediate cars.

The load-bearing body, as the name suggests, is to carry the parts of the car manufacturer, such as the engine, gearbox, suspension and so on. The parts and components of these cars are mounted directly on the body, they are a whole.

The non-load-bearing body retains the traditional chassis girders. The engine, gearbox and other auto parts are installed on the chassis girders, and the body does not carry the auto parts. Therefore, theoretically, an SUV model with a non-load-bearing body can run even if the body is removed.

Advantages and disadvantages of load-bearing bodies.

Pros:1Compared with the non-load-bearing body, the load-bearing body has no girders, so the overall mass will be lighter, so it is more fuel-efficient, and the center of gravity is relatively low;

2.The front and rear frames of the load-bearing body collapse in the event of a collision to protect the people in the vehicle by absorbing the impact force, so it is relatively safer.

Cons: 1Because there is no chassis girder, the SUV with a non-load-bearing body has poor torsion resistance and poor bearing capacity when encountering rough roads or heavy loads;

2.Because the parts are mounted on the body, and the various parts of the body are connected by welding, the load-bearing body is a whole. Comparatively speaking, it will be a little more complicated in terms of maintenance.

Advantages and disadvantages of non-load-bearing bodies.

Pros:1When the non-load-bearing body encounters rough roads, the extremely rigid chassis girders can well absorb and resist the twisting force, so the impact on the body will be greatly reduced;

2.Because a large number of chassis and body are separated, and there are many shock-absorbing materials embedded in the middle, there is less abnormal noise when driving in complex road conditions;

3.Because the parts are installed on the chassis girders, it will be more convenient when they need to be replaced or repaired.

Cons: 1Because the chassis girder is retained, the overall mass of the vehicle is larger, and the fuel consumption is naturally higher;

2.Because the body is mounted on the girders, the center of gravity of the body is high. In addition, the whole is heavier, and the rigidity of the chassis girder is high, so it is relatively rigid when turning, and it is difficult to turn at high speed;

3.Due to the presence of chassis girders, the non-load-bearing body cannot collapse in the event of a collision and absorb the impact force in the same way as the load-bearing body.

In the structure of the load-bearing body, all parts of the vehicle are connected to the welded main body frame, that is, the engine, gearbox, etc. are installed on the body, and there is no independent chassis system.

Models with load-bearing bodies are smooth, fuel-efficient, and relatively safer on the road. However, due to the lack of chassis girder frames, the body is more prone to deformation when encountering uneven roads or carrying a large number of goods.

The biggest feature of the non-load-bearing body is that there is an independent frame, arranged at the bottom of the body, the body does not carry car parts, and the engine, gearbox and suspension system are installed on the frame, so almost all the forces received by the car in driving are also acting on this frame, theoretically speaking, even if the car shell is removed, the car can still run.

Generally speaking, the non-load-bearing body chassis has high strength, and the body is less torsional when encountering complex intersections, which will have a greater advantage than the load-bearing body in extreme off-road. However, due to the added weight of the non-load-bearing body chassis girder frame, it will consume more fuel and will be more difficult when cornering at high speeds. In addition, due to the lack of the collapse design of the front and rear frames of the load-bearing body, the safety is low when impacted.

The biggest advantage of the load-bearing body is that it is light in weight, and the center of gravity is lower, and the utilization rate of space in the car is higher than that of the non-load-bearing body structure, so the non-load-bearing body structure has been replaced in the field of family cars.

However, the torsional rigidity and bearing capacity of the load-bearing body are relatively weak, so it is still the world of non-load-bearing body in the field of off-road vehicles and trucks.

The load-bearing body does not have a frame, and the body serves as the mounting base of the engine and chassis assemblies, and the body also has the role of a frame and bears all the loads.

Advantage 1: Light weight, good overall bending and torsional stiffness;

2. The center of gravity is low, the floor of the cabin is low, and the height of the vehicle is small;

3. It is mainly used for thin plate processing, and can be welded by spot welding, which is easy to mass produce.

Disadvantage 1: The noise and vibration of the road surface and the engine are easy to enter the body;

Because the entire body is used to ensure stiffness, it is difficult to modify.

The whole body of the load-bearing body car is integrated, there is no girder through the whole, the engine, transmission system, front and rear suspension and other components are assembled into the body, and the body load is transmitted to the wheels through the suspension device. The load-bearing body of the car is very smooth on the straight road, low natural frequency, low noise, light weight, and is widely used in cars. Of course, the strength of the chassis is not as strong as the non-load-bearing body with girder structure, and the body will be deformed when the four wheels of the car are stressed unevenly.

The non-load-bearing body has a girder running through the entire body structure, and the chassis has high strength and good anti-bump performance. Even if the four wheels of the car are not evenly stressed, they are borne by the frame and will not be transmitted to the body, so the body is not easy to twist and deform.

Advantages: light weight, relatively low center of gravity, high utilization rate of space in the car, and relatively good ride comfort.

Disadvantages: relatively weak torsional resistance and bearing capacity.

Uses: Mostly used in family cars and urban SUVs.

The body structure is divided into a load-bearing body and a non-load-bearing body. The obvious feature of the non-load-bearing structure is that the carriage can be separated from the chassis frame, and the engine gearbox is mounted directly on the frame, which can operate normally without the carriage. The load-bearing body does not have a separate chassis, and the body and cab are integrated.

The engine and transmission were mounted on longitudinal members protruding from the body. The non-load-bearing body is mainly used for hardcore off-road vehicles, while the load-bearing body is used for sedans.

Advantages of non-load-bearing body1The body strength is high, and there are separate girders to improve the rigidity of the body. In the case of uneven force, the four wheels are also subjected to the frame, and the pressure is not transmitted directly to the body.

2.The chassis frame and frame can be separated from the Zen cavity, and the connecting surface of the chassis frame and frame also has buffers to absorb energy. In this way, when driving on bumpy roads, there is less feedback to the car.

3.The chassis has a high ground clearance and stronger passability.

4.The car has small deformation, high stability and safety.

The disadvantages of the non-load-bearing body are its large weight, high center of mass and large wind resistance, which is not good for fuel consumption. The utilization rate between vehicles is small. For example, the trunk becomes smaller and flatter, so the spare tire of the non-load-bearing body SUV is either hung on the tailgate or placed on the bottom of the vehicle, which has its own advantages and disadvantages.

Hanging on the tailgate is more domineering. It is also very convenient to take out the protective spare tire, but it is easy to produce abnormal noise after a long time. Hanging the bottom is conducive to the empty trunk without worrying about abnormal noise, but it is not conducive to tire protection, and it is not convenient to take out the spare tire.

Especially when the off-road is hung on the bottom, the advantages and disadvantages of the load-bearing body are heavy, the weight is light, the fuel consumption is low, the drag coefficient is low, and it can drive at high speed. There are many parts of the whole body where steel plates are welded together, and there is a special energy-absorbing area, which is also very safe.

But its body as a whole is susceptible to chassis vibration and noise, and in the event of an accident, the chassis body parts are difficult to repair.

Millions of car purchase subsidies.

The disadvantages of the superior belt of the non-load-bearing body are as follows: advantages: 1. In addition to the buffering and vibration absorption effect of the tire and suspension system on the whole vehicle, the flexible rubber line brake can also play a role in auxiliary buffering, properly absorbing the torsional deformation of the frame and reducing noise, which not only prolongs the service life of the body but also improves the ride comfort, and is widely used in high-end cars and some intermediate cars; 2. The chassis and the body can be assembled separately, and then put together, which can simplify the assembly process and facilitate the organization of professional cooperation.

Disadvantages: 3. Because the body bearing is not considered in the design calculation, it is necessary to ensure that the frame has sufficient strength and rigidity, resulting in an increase in the self-gravity of the vehicle; 4. Because the chassis and the body are equipped with a frame, the height of the vehicle increases.