Dongfeng KR truck parts Intermediate transmission shaft and supporting bearing assembly 2202010-K52R0

Built as a core drivetrain component, this assembly features precision-engineered parts to minimize power loss during transmission. The intermediate shaft uses CNC-machined splines with a tolerance of ±0.02mm, ensuring a tight fit with the adjacent shafts and reducing backlash by 40% compared to aftermarket alternatives. The supporting bearing (double-row angular contact ball bearing) has a radial runout of ≤0.01mm, enabling smooth rotation at 3000rpm (maximum shaft speed) with minimal friction. This high-precision design ensures 99% power transmission efficiency, converting engine torque into wheel drive without significant loss—boosting vehicle acceleration by 5% and reducing fuel consumption by 3-4% during heavy-load operation

Engineered to bear the high torque of Dongfeng KR’s drivetrain (up to 1800N·m for Cummins ISB engines), the assembly uses premium materials for exceptional strength. The intermediate shaft is crafted from 42CrMo alloy steel via quenching and tempering, achieving a tensile strength of 1080MPa and yield strength of ≥930MPa—resisting torsion and bending deformation. The shaft’s outer surface is induction-hardened (HRC55-60) to enhance wear resistance at the spline and bearing contact areas. The supporting bearing’s inner ring is made of GCr15 bearing steel, with a fatigue life of 1000 hours under maximum load—ensuring the assembly withstands continuous heavy-duty operation without failure

Optimized for reduced vibration and noise, the assembly integrates multiple damping features to improve driving comfort. The supporting bearing is mounted with a rubber damper (natural rubber + nylon core) that absorbs 60% of torsional vibration from the engine and transmission, preventing it from transmitting to the chassis. The intermediate shaft’s balance grade reaches G6.3, with a residual unbalance of ≤10g·cm, minimizing centrifugal vibration at high speeds. The spline connection is pre-lubricated with molybdenum disulfide grease, reducing friction-induced noise by 15dB compared to dry splines. These design elements ensure the assembly operates quietly (≤65dB at 1m) and smoothly, reducing driver fatigue during long-haul trips

The assembly is designed for hassle-free installation and long service life, optimizing fleet maintenance efficiency. It comes fully pre-assembled (shaft + bearing + damper + mounting brackets), with 4 M16×40 high-strength bolts that align perfectly with the chassis mounting holes. Installation requires only a torque wrench (180-200N·m) and takes two technicians 60 minutes to complete—50% faster than assembling separate components. The shaft and bearing undergo anti-corrosion treatment: the shaft is galvanized (10μm thickness) and the bearing is sealed with a rubber shield, passing 1200-hour salt spray testing. With a service life of ≥250,000km and a 1-year warranty, it minimizes replacement frequency and long-term operational costs for fleet operators