Dongfeng Xinjiang truck parts Muffler with front air duct assy insulation function 1203410-T5KEX1Y

This integrated assembly features a four-layer composite insulation structure covering both the muffler and front air duct, addressing high-temperature exhaust risks. The inner layer uses high-purity ceramic fiber (operating temperature ≤680℃), the second layer is a double-sided aluminum foil reflective membrane (radiant heat reflection rate ≥94%), the third layer is high-density glass fiber, and the outer layer is stainless steel mesh reinforcement. When exhaust temperature reaches 520℃ (peak for heavy-duty engines), the outer surface temperature stays ≤60℃—a 78% reduction vs. non-insulated assemblies. This protects adjacent components (fuel lines, wiring harnesses, brake hoses) from heat aging and lowers the cab’s bottom temperature by 12-15℃, improving driver comfort in Xinjiang’s hot summers

Beyond insulation, the muffler achieves superior noise reduction through a dual-chamber resonance-dissipation design, while the front duct enhances airflow stability to minimize turbulent noise. The first muffler chamber uses perforated tubes (1.5mm holes, 30% porosity) to split exhaust, reducing primary noise by 28dB(A). The second chamber’s high-temperature sound-absorbing cotton (silica-alumina fiber) absorbs high-frequency noise (2200-5800Hz) by 15dB(A). The duct’s spiral guide vanes streamline airflow, cutting turbulent noise by 10dB(A). Overall, exhaust noise is reduced to ≤83dB(A)—well below GB 7258-2017 limits (≤89dB(A))—creating a quieter cab and reducing noise pollution during urban or residential area operations

Engineered for Dongfeng Xinjiang trucks’ harsh operating conditions (desert sandstorms, mountain hauling, construction sites), the assembly boasts exceptional robustness. The muffler and duct body are made of 439 stainless steel (2.2mm thickness) with ferritic structure, resisting thermal fatigue and corrosion—passing 180,000km vibration tests (5-2000Hz, ISO 16750-3) without cracking. The flange uses a graphite-metal composite gasket (≤650℃) for leak-tight sealing, ensuring National VI emission compliance. Insulation layers are bonded with inorganic high-temperature adhesive and fixed by 304 stainless steel straps, avoiding delamination under extreme temperature cycles (-45℃ to 580℃) in northeast China’s winters and northwest deserts

The integrated design (muffler + front duct) optimizes installation efficiency for commercial fleets. The 6-bolt front flange uses M12×45 galvanized grade 10.9 bolts matching the manifold’s original holes, allowing two technicians to complete installation in 50 minutes with a torque wrench (48-55N·m)—30% faster than separate components. The outer surface features high-temperature ceramic coating (≤650℃), resisting sand erosion and road salt—passing 1500-hour salt spray testing (ASTM B117) with no rust. The dual-chamber design minimizes carbon deposition, requiring maintenance only every 200,000km. Clear “INLET/OUTLET” markings and pre-installed hangers prevent errors, while the integrated structure eliminates assembly gaps, reducing leak risks