Dongfeng Xinjiang truck parts Silencer rear air duct assembly with insulation function 1203420-T5KEX1Y

Equipped with a multi-layer insulation structure, this assembly delivers exceptional heat resistance to address the high-temperature challenge of truck exhaust systems. The inner layer adopts high-temperature resistant ceramic fiber (working temperature up to 600℃), the middle layer uses aluminum foil reflective film (reflecting 90% of radiant heat), and the outer layer is reinforced with glass fiber cloth. This composite structure reduces the outer surface temperature of the duct to ≤60℃ when the exhaust temperature reaches 450℃—a 70% reduction compared to non-insulated ducts. It effectively prevents heat damage to adjacent chassis components (e.g., wiring harnesses, fuel lines) and reduces the ambient temperature in the cab’s rear area, improving driver comfort during long drives in hot regions

While retaining the silencer’s noise reduction effect, the air duct assembly further optimizes the exhaust noise control through its aerodynamic and structural design. The inner wall of the duct features a spiral guide vane structure that stabilizes exhaust gas flow, reducing turbulent noise by 15dB(A). The insulation layer’s porous structure also absorbs high-frequency noise components (2000-5000Hz) generated during exhaust, achieving an overall noise reduction of 8-10dB(A) at the rear of the truck. This makes the vehicle’s exhaust noise comply with GB 7258-2017 noise limits (≤89dB(A) for heavy-duty trucks) and creates a quieter driving environment, reducing driver fatigue during long-distance transportation

Engineered for the rigorous demands of Dongfeng Xinjiang trucks in complex road conditions, the assembly boasts a durable construction. The duct body is made of high-strength 409 stainless steel with a thickness of 1.5mm, featuring corrosion resistance and fatigue resistance that withstands 100,000km of vibration (5-2000Hz, ISO 16750-3) without deformation. The flange connection uses a heat-resistant graphite gasket that maintains a tight seal even at high temperatures, preventing exhaust leakage. The insulation layer is bonded with high-temperature adhesive (resistant to 650℃) and fixed with stainless steel straps, ensuring no delamination or falling off during extreme driving conditions (e.g., bumpy mountain roads, heavy loads)

Optimized for efficient maintenance and long service life, the assembly features a user-friendly design. The 8-bolt flange uses M12×30 galvanized bolts (grade 8.8) that match the silencer’s original mounting holes, allowing two technicians to complete installation in 40 minutes with only a torque wrench (40-45N·m). The outer surface of the duct is treated with high-temperature powder coating, resisting rust and corrosion even in high-humidity or high-salt coastal areas—passing 1000-hour salt spray testing (ASTM B117) with no visible rust. The insulation material is non-hygroscopic and resistant to aging, ensuring stable performance for over 150,000km. Additionally, the duct’s smooth inner wall reduces exhaust resistance, helping to improve fuel efficiency by 2-3%