Dongfeng GX shock absorber assembly 2921010-H02V0

As a key component for vehicle ride comfort and stability, this shock absorber assembly features dual-stage damping adjustment to adapt to varying road conditions and load weights. In the low-velocity compression/extension stage (e.g., small road bumps), it provides a softer damping force (1500 - 2000 N) to absorb minor vibrations, enhancing driver comfort during long-distance driving. In the high-velocity stage (e.g., potholes or rough terrain), it automatically switches to a stiffer damping force (3500 - 4500 N) to suppress excessive suspension movement, preventing the vehicle from bottoming out or losing stability—critical for heavy-duty operations with gross vehicle weights up to 35 tons. Additionally, the damping oil (high-viscosity index hydraulic oil) maintains stable viscosity across temperatures (-40°C to +120°C), ensuring consistent performance in extreme climates.

Engineered to withstand the heavy loads and mechanical stress of commercial truck operations, the assembly adopts a rugged structural design. The piston rod is made of high-carbon chromium steel (SUJ2) with a precision grinding and hard chrome plating process (plating thickness ≥10μm), achieving a surface roughness of Ra ≤0.2μm and a tensile strength of ≥1200 MPa—resisting bending and wear even under continuous lateral forces. The cylinder tube is crafted from seamless cold-drawn steel (ST52-3) with an internal honing finish (Ra ≤0.4μm) to minimize friction between the piston and tube wall. For leak prevention, it integrates a multi-layer sealing system: a primary oil seal (HNBR material) to block oil leakage, a dust seal (polyurethane) to prevent dust and debris from entering, and a backup O-ring (FKM) to enhance sealing reliability. This design ensures a leak rate of ≤0.1ml per 100 cycles, far below industry standards.

Built to endure the harsh operating conditions of commercial trucks (e.g., road vibration, dust, moisture, and chemical exposure), the assembly incorporates multiple protective features. The outer cylinder tube is coated with a triple-layer anti-corrosion finish: a zinc phosphate undercoat, a cataphoretic electrophoretic layer (thickness ≥20μm), and a top coat of high-temperature resistant enamel—achieving a salt spray resistance rating of ≥600 hours (per ASTM B117) to resist rust from road salt and rain. The mounting bushings are made of natural rubber with a steel core, providing excellent vibration isolation (damping vibration by up to 30%) and resisting aging under long-term compression. Moreover, the assembly undergoes a 500,000-cycle durability test (simulating 400,000 kilometers of road use) to verify its ability to withstand continuous vibration and mechanical stress without performance degradation.

This shock absorber assembly meets strict domestic and international standards for automotive suspension components. It complies with GB/T 18831 (China National Standard for Automotive Shock Absorbers), ISO 7681 (International Standard for Commercial Vehicle Shock Absorbers), and Dongfeng’s internal Q/DF 038-2024 standard for heavy-duty truck suspension parts. Each unit undergoes rigorous factory testing, including: a damping force test (to confirm compliance with OE specifications), a high-temperature performance test (stable operation at +120°C), a low-temperature start-up test (no oil thickening at -40°C), and a burst pressure test (withstanding 3 MPa without cylinder deformation). These certifications ensure the assembly’s safety, reliability, and compatibility with global markets, making it suitable for Dongfeng GX trucks operating in diverse regions, from cold northern plateaus to humid southern coastal areas.