Dongfeng VR truck parts Connected frame left bracket 8406311-C1106

Built to withstand the static and dynamic forces of frame connection (e.g., cargo weight transfer, road impact), the bracket is crafted from Q355B low-alloy high-strength steel. This material delivers a minimum yield strength of 355 MPa, tensile strength of 470–630 MPa, and impact toughness of ≥34 J at -40°C, enabling it to bear a maximum static load of 22kN without deformation (exceeding the VR’s frame connection design load by 18%). The steel undergoes normalized heat treatment (900–950°C heating, air cooling) to refine its microstructure, enhancing fatigue resistance—passing 2.2 million load cycles (equivalent to 900,000 km of road use) without crack formation. Compared to ordinary Q235 steel brackets, this Q355B design extends service life by 55% under frequent heavy-duty operations (e.g., long-haul cargo transport, off-road hauling)

Engineered to minimize stress concentration and improve load transfer between frame components, the bracket features a box-type closed structure at the main frame connection area—distributing vertical and lateral forces (from potholes or uneven roads) evenly across the main frame rail. It integrates 6mm-thick reinforcing ribs (spaced 38mm apart) along the bracket’s length and width, increasing torsional stiffness by 42% and reducing twist during sudden braking or cornering. The auxiliary frame mounting face is machined to a surface roughness of Ra 1.6μm, ensuring tight contact with the auxiliary frame and minimizing bolt stress (bolt torque retention rate ≥96% over 15,000 km). Unlike open-frame brackets that lack structural support, this optimized design maintains frame alignment even when the truck operates with full cargo loads, improving driving stability and reducing frame maintenance costs

Designed to resist corrosion from road salt, mud, and moisture (common in undercarriage environments), the bracket undergoes a four-stage protective process. First, a chemical degreasing and derusting treatment removes surface contaminants. Next, a zinc phosphate conversion coating (60μm thickness) creates a porous base for coating adhesion. Then, an electrophoretic primer (80μm) forms a uniform moisture barrier, preventing rust from forming on steel surfaces. Finally, a high-gloss epoxy powder coating (70μm) is baked on (180–200°C curing) to resist chipping, chemical damage (e.g., diesel, road deicers), and UV degradation. This coating system passes 1,200 hours of neutral salt spray testing without rust or peeling, ensuring durability in snowy, coastal, or mining regions—where undercarriage corrosion is a major concern

Designed for efficient replacement by fleet technicians, the bracket simplifies installation with user-friendly details. All mounting holes are drilled to H8 tolerance (ensuring perfect alignment with the VR’s M18 frame bolts) and chamfered to avoid damaging bolt threads during assembly. The package includes 6 grade 10.9 high-tensile frame bolts (M18×65mm) and lock washers, pre-lubricated with molybdenum disulfide to prevent thread galling in high-temperature environments. Installation takes 45–60 minutes: remove the old bracket by detaching the frame bolts, align the new bracket’s reference marks with the main and auxiliary frames, torque the bolts to 220 N·m (per OEM specifications), and verify frame movement. Each unit undergoes dimensional inspection via CMM (Coordinate Measuring Machine), load-bearing testing, and coating adhesion checks, backed by a 24-month warranty against defects (e.g., cracking, coating peeling, dimensional inaccuracies)