What are the rear bars of a car
The rear bar of an automobile is a safety device installed at the rear of an automobile. Its main function is to absorb and slow down the external impact force and protect the safety of the body and occupants.
Definition and function
The rear bumper, also known as the rear bumper, is one of the safety devices in the front and rear of the car body. Its main role is to absorb and mitigate the external impact force, so as to protect the safety of the body and occupants. The rear bar is usually composed of an outer plate, a buffer material and a beam, which are usually made of plastic, while the beam is made of cold-rolled sheet metal stamped into a U-shaped groove.
Historical background and technological development
Early car bumpers are usually made of steel plate stamping into channel steel, riveted or welded together with the frame longitudinal beam, but because of its appearance is not beautiful, with the development of the automobile industry, a large number of applications of engineering plastics make the bumper not only maintain the original protection function, but also the pursuit of harmony and unity with the body shape, and more lightweight.
Structural composition
The rear bar of an automobile is usually composed of three parts: an outer plate, a cushioning material and a beam. The outer plate and buffer material are made of plastic, while the beam is stamped into a U-shaped groove with cold-rolled sheet, and the outer plate and buffer material are attached to the beam.
The main functions of the rear bumper include the following aspects :
Protect the rear of the vehicle : The main function of the rear bar is to protect the rear of the vehicle to prevent collision with other objects during driving, so as to protect the safety of the body and passengers .
Absorb collision energy : in the event of a rear-end collision accident, the rear bumper can absorb part of the collision energy, reducing the injury to the occupants and damage to the internal components of the vehicle. By deforming and absorbing energy, rear bars can reduce damage to vehicle structures and reduce maintenance costs .
Aesthetic and decorative function : The design of the rear bar is usually coordinated with the overall style of the vehicle, not only plays a protective role, but also has a certain decorative role, making the vehicle look more beautiful .
Integration of a variety of practical functions : The rear bars of modern cars are also integrated with a variety of practical functions. For example, some models have astern radar or cameras installed on the rear bars to assist the driver in reversing operations; Some models are equipped with automatic parking assist system sensors to facilitate the driver to park; Off-road models may also have tow hook mounting points on the rear bumper for outdoor rescue .
The reasons for the failure of the rear bar mainly include design defects, manufacturing process problems, assembly process problems and temperature changes. The bumper design of some models may have its own structural problems, such as unreasonable shape design or insufficient wall thickness, which may cause the bumper to crack during normal use. Internal stress and material uniformity issues in the manufacturing process can also cause bumpers to crack during use. In addition, the accumulation of tolerances in the assembly process can also form strong internal stresses, leading to bumper cracking. Extreme temperature changes may also affect the physical properties of plastic bumpers, which can cause cracking .
The solution to a rear bumper fault depends on the specific cause of the fault and the extent of the damage. If it is only a small crack, you can consider using a professional repair tool to repair. If the damage is severe, the entire bumper may need to be replaced. When replacing the bumper, it is recommended to choose the original bumper, although the price is higher, the quality of the original bumper is more reliable, and has more advantages in toughness . If the bumper internal bracket is badly damaged or cracked, it usually needs to be replaced .
Advice to prevent a car's rear bumper failure includes regularly checking for loose bumper retaining screws and clips to ensure that the bumper is securely installed. In addition, avoid stopping at extreme temperatures for long periods of time to reduce the impact of temperature changes on the bumper. Regular maintenance and maintenance of the vehicle, timely detection and resolution of potential problems, can effectively extend the service life of the rear bumper .
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