Dongfeng GX Tie Rod Assembly 3412110-H19C1

Engineered to withstand the high lateral and axial forces generated during heavy-duty truck steering, the tie rod assembly features a robust structural design. The main tie rod body is crafted from 40Cr alloy steel (a high-strength structural steel) precision forging and quenching-tempering treatment, achieving a tensile strength of ≥1000 MPa and a yield strength of ≥800 MPa—far exceeding the requirements for standard light-duty vehicle tie rods. The connecting ends are equipped with forged steel ball joint housings that enhance load-bearing capacity, enabling the assembly to handle a maximum steering load of 15 kN without deformation or failure. This strength ensures reliable steering control even when the vehicle is fully loaded (up to 30 tons of gross vehicle weight) or operating on rough road conditions.

A key attribute of this assembly is its ability to ensure precise steering transmission, which is critical for heavy-duty truck safety. The integrated ball joint (a core component) features a precisely ground chrome-plated ball stud and a high-density PTFE (polytetrafluoroethylene) bearing, reducing friction coefficient to ≤0.15 and minimizing steering play (total play ≤1.5mm). This design ensures that the steering input from the driver is transmitted to the wheels without delay or loss, maintaining stable vehicle trajectory during straight-line driving and accurate turning radius during cornering. Additionally, the ball joint is equipped with a preload adjustment mechanism, allowing technicians to fine-tune the joint’s tightness during maintenance, further extending the assembly’s service life and ensuring consistent steering performance.

Built to resist the harsh operating conditions of commercial vehicles (e.g., dust, moisture, road salt, and extreme temperatures), the assembly incorporates multiple protective features. The tie rod body is coated with a cataphoretic electrophoretic paint layer (thickness ≥20μm) followed by a top coat of high-gloss anti-corrosion paint, achieving a salt spray resistance rating of ≥500 hours (per ASTM B117 standard) to prevent rust and corrosion. The ball joint is sealed with a double-lip rubber boot (made of HNBR—hydrogenated nitrile butadiene rubber) that provides IP67-level dust and water resistance, preventing contaminants from entering the joint and damaging the internal bearing. Moreover, the assembly can operate stably within a temperature range of -40°C to +120°C, making it suitable for use in diverse climates, from cold northern regions to hot southern areas.

This tie rod assembly meets or exceeds strict domestic and international safety and quality standards for automotive steering components. It complies with GB/T 13601 (China National Standard for Automotive Steering Tie Rods), ISO 8767 (International Standard for Steering Ball Joints), and Dongfeng’s internal Q/DF 028-2023 standard for heavy-duty truck steering systems. To ensure reliability, each unit undergoes a series of rigorous tests before leaving the factory, including: a 20,000-cycle fatigue test (to verify structural durability), a dynamic load test (to simulate real-world steering forces), a seal performance test (to check for leaks), and a dimensional inspection (using 3D coordinate measuring machines). These tests guarantee that the assembly meets safety requirements and can provide long-term reliable service, with an expected service life of over 400,000 kilometers under normal operating conditions.