Dongfeng Xinjiang truck spare parts Silencer rear air duct assembly with insulation function 1203420-TCWF01Y

Equipped with a three-layer composite insulation structure, this assembly delivers industry-leading heat resistance to tackle high-temperature exhaust challenges. The inner layer uses high-purity ceramic fiber (working temperature up to 650℃), the middle layer features a double-sided aluminum foil reflective membrane (radiant heat reflection rate ≥92%), and the outer layer is reinforced with high-temperature glass fiber mesh. When exhaust temperature reaches 480℃ (peak for diesel engines), the duct’s outer surface temperature remains ≤58℃—a 72% reduction compared to non-insulated ducts. This prevents heat damage to adjacent components (fuel lines, wiring harnesses, brake hoses) and reduces fire risks, while lowering the cab’s rear ambient temperature by 8-10℃ for improved driver comfort

Beyond insulation, the assembly enhances the silencer’s noise reduction effect through precision aerodynamic design. The inner wall is integrated with spiral guide vanes that streamline exhaust gas flow, reducing turbulent noise by 18dB(A) and eliminating airflow separation. The insulation layer’s porous structure further absorbs high-frequency noise (2500-5500Hz) generated by exhaust vibration, achieving an overall noise reduction of 9-11dB(A) at the truck’s rear. This ensures the exhaust system meets GB 7258-2017 noise limits (≤88dB(A) for heavy-duty trucks) and creates a quieter driving environment, reducing driver fatigue during long-haul logistics operations (typically 800+ km per day)

Engineered for Dongfeng Xinjiang trucks’ harsh working scenarios (deserts, mountain roads, construction sites), the assembly boasts exceptional structural robustness. The duct body is made of 439 stainless steel (1.6mm thickness) with a ferritic structure, resisting corrosion and thermal fatigue—passing 120,000km vibration tests (5-2000Hz, ISO 16750-3) without deformation. The flange uses a heat-resistant graphite gasket (operating temperature ≤600℃) that maintains a leak-tight seal, preventing exhaust gas leakage (emission compliance with GB 17691-2018 National VI). The insulation layers are bonded with high-temperature inorganic adhesive and fixed by 304 stainless steel straps, ensuring no delamination even under extreme temperature cycles (-40℃ to 500℃)

Optimized for efficient fleet maintenance, the assembly features a user-centric design. The 6-bolt flange uses M12×35 galvanized high-strength bolts (grade 10.9) that match the silencer’s original mounting holes, allowing two technicians to complete installation in 35 minutes with only a torque wrench (42-48N·m). The outer surface is coated with high-temperature ceramic paint (resistant to 600℃), resisting rust and road salt corrosion—passing 1200-hour salt spray testing (ASTM B117) with no red rust. The insulation system is maintenance-free (no replacement of materials needed) and ensures stable performance for 180,000km. Additionally, the smooth inner wall reduces exhaust backpressure by 5%, improving fuel efficiency by 2-3% compared to worn ducts