What is the rear compact upper support component of the car?
The term "reduced-section upper support component for the vehicle rear" does not have a standard or universal definition in public materials. However, based on the context and common knowledge of vehicle structure, it is likely referring to the hydraulic support rod of the vehicle tailgate (trunk), also known as "gas spring support rod" or "gas spring".
Why this interpretation?
"Rear": Refers to the rear part of the vehicle, typically involving the tailgate and trunk area.
"Upper support": When the tailgate is opened, the support rod is installed between the tailgate and the vehicle body, providing upward support.
"Reduced section": May mean that the component is in a contracted state (i.e., the rod body shortens) when not in use, and only extends for support when in use - this is the typical working state of a hydraulic support rod.
"Component": Emphasizes that it is a complete mechanical unit including a piston, cylinder, gas, and oil.
Core functions and principles
Scientific name: Gas Spring Support Rod.
Working medium: The sealed cavity is filled with high-pressure nitrogen and a small amount of damping oil.
Working principle:
When the tailgate is opened, the rod body is stretched, and the internal gas expands to push the piston, generating support force;
The oil flows slowly through the throttle hole to achieve "slow rise, stable stop, slow descent";
It does not consume electricity, has no noise, and the lifespan is typically 30,000 to 50,000 times of opening and closing.
Typical application scenarios:
For SUVs, MPVs, and some sedans, the tailgate, engine hood, spare tire compartment, etc., which require single-handed operation and need safe suspension, are the parts.
Common problems and precautions
Aging manifestations:
The tailgate automatically drops halfway when opening;
It crashes down with a "snap" when closing;
There is abnormal noise or jamming when opening or closing.
Replacement suggestions:
It is necessary to choose a support rod that is compatible with the vehicle model, matching the stroke, diameter, installation hole distance, and output force value;
Random replacement may result in insufficient support or "cracking the inner lining of the tailgate".
Authoritative materials support
Many recent (2025–2026) technical popular science articles unanimously refer to this component as "hydraulic support rod" or "gas spring support rod", and clearly state that it is a "passive safety component", widely used in modern vehicle tailgate systems. If you see "retractable upper support component" in the maintenance manual or parts catalogue, it is recommended to check the original factory part number for your specific vehicle model or consult the 4S store to ensure an accurate match.
The term "reduced-top upper support component at the rear of the vehicle" does not have a standard term equivalent in public materials. However, considering the context and automotive structure knowledge, it might refer to the local structure of the rear shock tower (or shock pillar mounting seat), especially in some models where a "reduced-top" upper support design is adopted for space optimization or lightweighting purposes.
According to authoritative public materials, its core functions are as follows:
Installation and support of shock absorbers: As a key support point of the suspension system, it is used to fix the top of the shock absorber to ensure its normal operation.
Enhancement of vehicle rigidity: Together with the rear cabin longitudinal beam, crossbeam, etc., it forms a ring-shaped support framework to enhance the stiffness of the vehicle's rear structure.
Improvement of handling stability: By providing a stable installation foundation, it affects the suspension geometric angles (such as tire inclination angle, beam angle), thereby improving the steering response and cornering stability.
As an installation base for reinforcing components: It is often used to install body strengthening components such as balance tie rods, further reducing side roll.
If "reduced" refers to a reduction in structural size, it is usually for lightweighting or space optimization, reducing weight while ensuring functionality, which is in line with the current automotive lightweighting trend.
Note: This term is not a common industry name. It is recommended to confirm its precise definition by referring to specific vehicle drawings or repair manuals.
If you want to know more, keep reading the other articles on this site!
Please call us if you need such products.
Zhuo Meng Shanghai Auto Co., Ltd. is committed to selling MG&MAXUS auto parts welcome to buy.
