Dongfeng Xinjiang truck parts Process assembly of rear suspension lower bracket 5001920-C49KF01Y

Built to withstand the extreme torsional and compressive forces of rear suspension systems—common in Xinjiang’s mining, construction, and long-haul transport—the bracket assembly is crafted from Q690D high-strength low-alloy steel. This material delivers a minimum yield strength of 690 MPa, tensile strength of 770–940 MPa, and impact toughness of ≥40 J at -40°C, enabling the bracket to bear a maximum static load of 180 kN (exceeding Dongfeng Xinjiang’s 150 kN design requirement). The steel undergoes quenching and tempering (900°C quenching, 600°C tempering) to enhance hardness (HB 240–280) and fatigue resistance, passing 3 million vibration cycles (equivalent to 200,000 km of road use) without crack formation. Compared to standard Q355 steel brackets, this Q690D design improves load-bearing capacity by 45% while reducing weight by 8%—critical for balancing durability and fuel efficiency in heavy-duty operations

Engineered to minimize stress concentration and prevent deformation under dynamic loads, the bracket features a multi-point reinforcement design. The leaf spring mounting area is reinforced with a 15mm-thick steel rib (extending 80mm along the bracket length), increasing local stiffness by 60% and reducing bending by 35% during rough road driving. The axle connection interface uses a curved transition structure (radius R15mm) instead of sharp corners, distributing torsional stress over a larger area and avoiding crack initiation. Additionally, the bracket’s weld joints (between the main body and reinforcement ribs) are full-penetration welds (weld leg height 8mm) inspected via ultrasonic testing (UT) to ensure no internal defects—critical for withstanding sudden impacts (e.g., driving over potholes or rocks). This structural optimization ensures the bracket maintains stability even when the truck operates on unpaved desert or mining roads with frequent (jolts)

Designed to resist corrosion from road salt (used in Xinjiang’s winter de-icing), mud, and moisture—the main causes of bracket premature failure—the assembly undergoes a four-stage protective process. First, shot blasting (SA 2.5 grade) removes surface rust and contaminants, creating a rough texture for coating adhesion. Next, a zinc phosphate conversion coating (60μm thickness) forms a corrosion-resistant base layer. Then, an electrophoretic primer (80μm) is applied to seal the steel surface, preventing moisture intrusion. Finally, a high-gloss epoxy powder coating (70μm) is baked on (180–200°C curing) to resist chipping, chemical damage (e.g., diesel, mineral oil), and UV degradation. This coating system passes 1,800 hours of neutral salt spray testing without rust or peeling, ensuring durability in Xinjiang’s harsh climates—from snowy winters to humid summer grasslands

Designed for efficient replacement by fleet technicians, the bracket simplifies installation with user-friendly details. All mounting holes are drilled to H8 tolerance (precision ±0.02mm), ensuring perfect alignment with the truck’s M18 leaf spring bolts and M22 axle bolts—avoiding cross-threading during assembly. The bracket’s surface is deburred to eliminate sharp edges that could damage rubber bushings or wiring harnesses. The package includes 4 grade 12.9 high-tensile bolts (M18×60mm for leaf springs, M22×70mm for axle) and lock nuts (pre-lubricated with molybdenum disulfide to prevent thread galling). Installation takes 60–90 minutes: remove the old bracket by detaching leaf spring and axle bolts, align the new bracket’s reference marks with the suspension components, torque the bolts to OEM specs (280 N·m for M18, 450 N·m for M22), and verify suspension alignment. Each unit undergoes dimensional inspection via CMM, load testing, and weld quality checks, backed by a 36-month warranty against defects (e.g., cracking, deformation, coating peeling)