Dongfeng VL truck parts Left bumper assembly 8406019-C4301

Built to withstand low-speed collisions (up to 30km/h) and road debris impacts (e.g., stones, gravel), the bumper’s outer shell uses a PP+15% glass fiber composite. This material delivers a notched Izod impact strength of 12.5 kJ/m² at -30°C (resisting cracking in cold climates) and a heat deformation temperature of 118°C (preventing warping under engine bay heat or direct sunlight). The inner structure integrates a 1.7mm-thick Q355B high-strength steel reinforcement beam (tensile strength: 470–630 MPa) that absorbs 62% of impact force during collisions, protecting critical components like the left-side radiator (heat dissipation area: 12 m²) and intercooler. Compared to all-plastic bumpers, this composite-steel hybrid design improves impact resistance by 58% while keeping weight 24% lower than all-steel alternatives—critical for balancing protection and fuel efficiency in heavy-duty hauling

Engineered to meet China’s GB 26512-2011 commercial vehicle front impact safety standards and ECE R42 regulations, the bumper features a three-stage crash absorption system. First, the outer composite shell deforms in a controlled “crumple zone” pattern during minor impacts (≤15km/h), absorbing 38% of impact energy to avoid damage to the chassis. Second, four 85mm-thick EPDM rubber energy absorbers (mounted between the steel beam and chassis) compress to dissipate 33% of residual force, reducing frame deformation by 43% vs. bumpers without absorbers. Third, the steel reinforcement beam bends along pre-designed weak points at high impacts (15–30km/h), preventing catastrophic damage to the engine bay. This design ensures the bumper can withstand a 4.8kN static load at the center without permanent deformation, meeting the VL’s heavy-duty safety requirements for construction and long-haul use

Designed to enhance the VL’s front-end performance, the bumper includes two key integrated features: a 340mm×58mm ventilation duct that directs 18% of front airflow to the left-side intercooler, improving turbocharged engine efficiency by 7.5% (measured at 60km/h full load); and a pre-molded fog light housing with a waterproof rubber gasket (IP67 rating), preventing water intrusion during heavy rain or off-road driving. The bumper’s lower edge also features a 1.9mm-thick stainless steel skid plate (290mm long) that protects the left-side oil pan and lower grille from damage when driving over curbs or uneven terrain. Additionally, a hidden tow hook mounting hole (compatible with the VL’s factory 5-ton tow hook) eliminates the need for post-installation drilling, preserving the bumper’s structural integrity and aesthetics

The bumper undergoes a four-stage anti-corrosion and weather-resistant treatment: chemical degreasing, zinc phosphate conversion coating (58μm), electrophoretic primer (78μm), and a polyurethane topcoat (68μm) with UV stabilizers. This coating system passes 1,450 hours of neutral salt spray testing (no rust or peeling) and 2,900 hours of xenon lamp aging (≤3% color fade), ensuring durability in coastal, snowy, or desert regions. For installation, the bumper comes with a complete hardware kit: 8 grade 10.9 high-tensile M14×54mm bolts (pre-lubricated with molybdenum disulfide to prevent thread galling) and 8 lock washers. It mounts directly to the VL’s factory chassis brackets via pre-drilled holes (H8 tolerance), requiring only a torque wrench for assembly—installation time is 42–58 minutes for a single technician. Each unit undergoes dimensional inspection via CMM, impact testing, and waterproof verification, backed by a 24-month warranty against defects (e.g., composite cracking, steel beam deformation, coating peeling)