What is the rear longitudinal beam assembly on the right side of the car?
The rear longitudinal beam assembly on the right side of the car is the core longitudinal structural component at the rear of the vehicle, which is responsible for bearing the load and providing collision protection. It is usually located beneath the trunk and on the inner side of the right rear wheel.
What exactly is it?
Location: Below the trunk, extending along the front and rear of the vehicle, it is part of the frame or body structure.
Structure: It forms a rigid frame with the crossbeam through welding or riveting, with common sections being channel-shaped, I-shaped, or box-shaped.
Material: Mostly made of low-alloy steel, and for some models, aluminum is used for weight reduction and improved crash performance.
Its main functions:
Supporting the vehicle body: As a load-bearing component, it ensures the rigidity of the vehicle and its driving stability.
Collision energy absorption: In case of rear-end collisions, the rear longitudinal beam collapses and deforms to absorb the impact energy, protecting the passenger compartment as well as the fuel tank, battery pack, and other critical components.
Connecting components: It is used to connect the rear body panels, floor, etc., and provides installation points for related components.
Maintenance considerations:
If the rear longitudinal beam is severely damaged, it can be replaced, but it must be done using a professional beam alignment instrument in a professional auto repair shop. The strength after repair is generally not as good as the original factory level. When buying a used car, the rear longitudinal beam is a key inspection area. Pay attention to any deformation, welding or rust marks.
The main function of the rear longitudinal beam assembly on the right side of the car is to support the vehicle body structure and absorb energy in collisions, such as rear-end collisions, by collapsing and deforming, protecting the passenger compartment and fuel tank, battery pack, and other critical components.
Specifically:
Load-bearing and rigidity support: It is the "skeleton" at the rear of the vehicle, together with the crossbeam, forming a rigid frame, bearing the weight of the vehicle's rear and enhancing the vehicle's driving rigidity.
Collision energy absorption: In case of rear-end collisions, it works in conjunction with the rear bumper beam and energy absorption box, collapsing and absorbing impact energy in sequence to reduce the transfer of impact to the passenger compartment.
Protecting critical components: It reduces the damage risk to the fuel tank, battery pack, etc., during collisions.
Note: If this component is severely damaged and deformed, it will affect the four-wheel alignment data and the vehicle's strength, and may increase noise inside the car and decrease the value of the used car. In such cases, replacement is possible, but the strength after repair is generally not fully restored to the original factory level. It is recommended to handle it with a beam alignment instrument in a well-equipped professional auto repair shop. If the damage is severe, it can be replaced. However, the strength after repair is generally not as good as the original factory level, and the vehicle will be classified as a structural accident vehicle, resulting in a significant decrease in second-hand value.
The rear longitudinal beam on the right side belongs to the core structural component of the vehicle. Once damaged, the safety, handling performance, and residual value of the vehicle will be affected. The handling method should be determined based on the degree of damage.
Minor deformation (small-angle bending, surface depression): Usually, it can be repaired by cold or hot alignment using a beam alignment instrument, and does not require replacement; Severe deformation (wrinkling, tearing, fracture, twisting over 15 degrees): Must be replaced; otherwise, the energy absorption capacity during a secondary collision will significantly decrease, posing safety risks.
Repair vs. Replacement: Minor deformation can be restored to 80% of the original factory state after repair; severe damage requires cutting and replacement, otherwise the energy absorption capacity will significantly decrease during a secondary collision, posing safety risks.
Where to repair: It must be done at a well-equipped and legitimate repair shop or 4S store, using a beam alignment instrument and laser measuring instrument for positioning to ensure an error control within 2mm. Do not weld randomly at small shops.
What to do after repair: A four-wheel alignment must be performed, check for cracks or rust at the welding points, and pay attention to whether the steering wheel deviates or makes abnormal noises when driving at high speeds.
Before repair: It is not recommended to drive until the repair is completed. Unprofessional repair of the beam will affect the stability and safety of the vehicle. If the repair cost exceeds 30% of the current value of the vehicle, you can consider scrapping or replacing the vehicle.
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