Dongfeng KR truck parts intake inlet pipe Upper bracket 1109822-C5101

Built to bear the weight of the intake pipe and resist engine vibration, this upper bracket is crafted from Q355B high-strength structural steel—boasting a tensile strength of 510-660MPa and yield strength of ≥355MPa, far exceeding the performance of ordinary Q235 steel. The bracket undergoes a two-stage heat treatment (normalization + tempering), enhancing its surface hardness to HB180-210 and improving fatigue resistance. Finite element analysis (FEA) confirms it can withstand a static load of 50kN (equivalent to 5 tons) and 1 million vibration cycles (5-2000Hz, ISO 16750-3) without deformation or cracking. The 12mm-thick steel plate at the bolt connection area further reinforces load distribution, preventing stress concentration and ensuring long-term structural stability

Engineered for precise integration with the Dongfeng KR’s intake system, the bracket features CNC-machined key surfaces with strict dimensional tolerances. The arc-shaped pipe contact surface has a radius tolerance of ±0.5mm, ensuring full contact with the intake pipe (60mm outer diameter) and avoiding point-load damage. The bolt holes (M10 thread) are processed via tapping and rolling, achieving a thread precision grade of 6H and ensuring a secure fit with the mounting bolts—no thread slipping even after repeated disassembly. The bracket’s overall flatness tolerance is ≤0.2mm, guaranteeing the intake pipe is aligned horizontally within ±1mm, which maintains smooth airflow and avoids turbulent losses that reduce engine intake efficiency by up to 5%

Designed for the harsh conditions of engine compartments (oil mist, dust, temperature changes), the bracket features a multi-layer anti-corrosion coating system. It undergoes zinc phosphate pretreatment to remove rust, followed by electrophoretic coating (80μm thickness) and powder coating (60μm thickness)—forming a dense protective layer that resists chemical corrosion and physical wear. This coating passes 1500-hour neutral salt spray testing (ASTM B117) with no red rust, ensuring durability in coastal high-salt areas and dusty construction sites. The coating also has excellent heat resistance, maintaining adhesion and color stability even under 120℃ continuous heat from the engine, avoiding peeling that leads to accelerated corrosion

Optimized for efficient fleet maintenance, the upper bracket features a hassle-free installation design. The 3 M10 bolt holes align perfectly with the engine compartment top beam’s original mounting points, using grade 8.8 high-strength galvanized bolts that require a torque of 45-50N·m for secure fixation—no specialized tools needed. The bracket’s lightweight design (1.5kg) allows a single technician to handle installation, and the arc-shaped contact surface comes pre-coated with anti-slip rubber pads, eliminating the need for additional gaskets. Clear laser-etched markings (“TOP” and part number) prevent reverse installation, and the compatibility with original intake pipes ensures quick replacement. Two technicians can complete the entire installation process in 25 minutes, reducing fleet downtime and maintenance costs significantly