Dongfeng LoongGine Gearbox Assy Transmission shaft assembly 1701030-TV404

The 1701030-TV404 assembly is designed to handle the high torque loads of Dongfeng LoongGine gearboxes (typically 1,800-2,500 N·m, depending on the gearbox model) during heavy-duty operation. The shaft core is crafted from forged 40Cr alloy steel—heat-treated via quenching and tempering to achieve a tensile strength of 900-1,100 MPa and a hardness of HRC 28-32—ensuring it resists torsional deformation and fatigue failure under continuous high-torque stress (e.g., hauling 40+ ton payloads, climbing steep grades). Additionally, the shaft’s spline sections are precision-ground to enhance load-bearing capacity, distributing torque evenly across the spline teeth to prevent premature wear or tooth stripping—critical for maintaining uninterrupted power transmission

Key contact surfaces of the transmission shaft—including spline teeth and flange mounting faces—are treated with advanced wear-resistant technologies to extend service life. The splines feature a nitriding coating (thickness: 0.1-0.2mm) that increases surface hardness to HRC 55-60, reducing friction and wear caused by constant meshing with gearbox shafts. The flange faces are machined to a ultra-smooth finish (Ra 0.8 μm or lower) and coated with anti-corrosion zinc plating, preventing rust and ensuring tight, leak-free connections with drivetrain components. These treatments, combined with strict dimensional control during manufacturing, allow the assembly to withstand 300,000+ km of operation under harsh working conditions (e.g., dusty construction sites, long-haul highways)

Every 1701030-TV404 transmission shaft undergoes rigorous dynamic balance testing (per ISO 1940-1 standards) to ensure rotational stability at high speeds (up to 3,000 rpm, the maximum operating speed of Dongfeng LoongGine gearboxes). Using specialized balancing machines, any mass imbalances (typically limited to ≤5 g·cm) are corrected via precision drilling or adding balance weights, minimizing vibration during operation. Excessive vibration can damage gearbox bearings, universal joints, and other drivetrain components—so this balance optimization not only improves driving comfort but also reduces premature wear on adjacent parts, lowering overall maintenance costs for vehicle operators. The shaft also features a straight, uniform design to further enhance rotational stability, avoiding stress concentrations that could lead to cracking

As an OEM component for Dongfeng LoongGine, the 1701030-TV404 assembly undergoes a series of strict quality inspections to meet heavy-duty gearbox standards. Key tests include: torque load testing (to verify torsional strength under simulated maximum load), fatigue testing (to simulate 1 million+ torque cycles), and dimensional accuracy checks (via coordinate measuring machines to confirm spline pitch, flange hole position, and shaft straightness). Additionally, the assembly is factory-assembled with compatible components (e.g., precision bearings, dust seals) that meet Dongfeng’s specifications—eliminating the risk of mismatched parts during installation. Only assemblies that pass 100% of these tests are approved for distribution, ensuring consistent performance, compatibility, and reliability for Dongfeng LoongGine gearbox systems