Best Coil Spring Rear Shock Absorber OEM 3818900719 3878901019 3878901619 3818900919 for Mercedes-Benz Ng Series Trucks Auto Parts/Shock Absorber

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Function of Shock Absorbers
Cushioning Road Impact
The driving routes of trucks are complex and varied. From smooth highways to bumpy rural roads, they encounter all kinds of bumps. The primary function of shock absorbers is to cushion these impacts from the road. When the wheels roll over bumps and potholes, the instantaneous impact force, if directly transmitted to the frame and cab, will not only subject the driver and passengers to violent vibrations but also make the cargo easily displaced and damaged due to vibrations. Shock absorbers convert the impact force into thermal energy and dissipate it through their internal damping structure, smoothly resolving road impacts and keeping the vehicle body in a relatively stable posture.
Stabilizing Vehicle Posture
High-speed driving, turning, and emergency braking are common driving conditions for trucks. When driving at high speed, even slight irregularities on the road can cause the vehicle body to shake; when turning, centrifugal force will cause the vehicle to tilt; when braking suddenly, the huge inertial force will cause the front of the vehicle to sink. High-quality shock absorbers can effectively suppress these adverse posture changes. With reasonable damping settings, they provide sufficient support and rebound force for the vehicle body, ensuring that the tires are always in close contact with the road and maintaining good grip and handling stability, allowing the driver to precisely control the driving direction.
Protecting Vehicle Components
Continuous vibrations are the "enemy" of vehicle parts. Prolonged violent vibrations will accelerate the wear of components such as the frame, suspension, and tires, reducing their service life. Frequent maintenance and replacement of parts undoubtedly increase operating costs. Shock absorbers act like shields, absorbing and filtering vibrations, greatly reducing the damage to vehicle components caused by vibrations, prolonging the service life of the entire vehicle, and ensuring the long-term stable operation of trucks.
Importance of Shock Absorbers
Improving Driving Comfort
For truck drivers on long journeys, the cab is their "mobile office." A comfortable driving environment can effectively relieve driving fatigue, improve attention and reaction speed, and reduce the risk of accidents caused by fatigue driving. The excellent shock-absorbing effect of shock absorbers can filter out most of the bumps, making the cab stable and less vibratory. After a long drive, the driver can also maintain a good mental state and engage in subsequent work.
Ensuring Cargo Integrity
The transported goods are valuable, and some are extremely fragile and vulnerable. If the shock absorption is poor, the goods will collide and roll back and forth in the carriage and may be completely unrecognizable when they reach their destination. Shock absorbers keep the carriage stable, prevent goods from being damaged by vibrations, and reduce the cargo damage rate. This is particularly crucial for the transportation of fragile items, precision instruments, and high-value-added goods and directly relates to the economic benefits and reputation of transportation enterprises.
Enhancing Driving Safety
A stable vehicle posture and good handling are the foundation of driving safety. In emergencies such as avoiding pedestrians and braking suddenly, shock absorbers help the vehicle respond quickly and smoothly, preventing the vehicle from losing control and skidding; when the road is slippery in rainy or snowy days, they ensure tire grip and allow trucks to safely pass through complex road conditions, protecting the lives and property of drivers, cargo, and other road users.
Technical Details
Structural Design
Common truck shock absorbers have tubular and swing arm structures. Tubular shock absorbers are further divided into single-tube and double-tube types. Single-tube shock absorbers have a compact internal structure, fast response speed, and superior heat dissipation performance, suitable for trucks with high-performance requirements. Double-tube shock absorbers have two cylinders, an outer cylinder for storing oil and an inner cylinder for accommodating the piston. They work stably and have a moderate cost. Swing arm shock absorbers are mostly used in heavy trucks. By utilizing the lever principle of the swing arm, they can withstand greater loads and have excellent cushioning effects.
Working Principle
Based on the principle of hydraulic damping, shock absorbers mainly consist of a piston rod, piston, cylinder body, valves, and oil. When the wheel bounces upward (compression stroke), the piston moves downward, increasing the oil pressure in the lower chamber. The oil flows to other chambers through the flow valve, and partially pushes open the compression valve, generating a small damping force to cushion the impact. When the wheel falls back (extension stroke), the piston moves upward, and the oil pressure in the upper chamber suddenly rises. The extension valve opens, and the oil flows back. In this process, a larger damping force is generated to attenuate vibrations and convert mechanical energy into thermal energy and dissipate it.
Key Parameters
Load-bearing capacity: Designed according to the truck's own weight and load capacity. The load-bearing capacity of heavy truck shock absorbers can reach several tons to ensure stable operation under heavy pressure.
Stiffness coefficient: Includes static stiffness and dynamic stiffness. Static stiffness maintains the vehicle's posture when it is stationary; dynamic stiffness adapts to dynamic driving and flexibly adjusts damping according to road conditions.
Damping ratio: Generally between 0.2 and 0.4, which is related to the shock absorption efficiency. A reasonable damping ratio allows vibrations to decay quickly and prevents excessive vehicle body rebound.