Dongfeng KR Fan coupling assembly 1308080-KS1A1

Equipped with a bi-metallic strip thermostat and silicone oil damping mechanism, the assembly enables automatic fan speed adjustment based on engine coolant temperature. When the coolant temperature is below 82℃, the thermostat keeps the silicone oil in the reservoir, allowing the fan to run at 30-40% of the engine speed (reducing power loss). As the temperature rises to 88-95℃, the bi-metallic strip expands to open the oil passage, letting silicone oil flow into the working chamber—increasing fan speed to 80-90% of engine speed for enhanced cooling. This intelligent regulation reduces fuel consumption by 2-3% compared to fixed-speed fans and prevents engine overheating or unnecessary energy waste

The coupling’s working chamber uses high-viscosity silicone oil (viscosity: 100,000 cSt at 25℃) and precision-machined friction plates (surface roughness Ra ≤ 0.4μm) to ensure efficient torque transfer. It has a maximum torque capacity of 280N·m and can withstand continuous operation at engine speeds up to 2,800 RPM, providing sufficient cooling airflow even under heavy engine loads (e.g., climbing slopes with full cargo). The dynamic balance grade of the assembly reaches G6.3 (per ISO 1940), minimizing vibration during high-speed operation and reducing wear on the water pump and bearing components

The assembly features a double-lip nitrile rubber seal (NBR material) and a stainless steel pressure plate to prevent silicone oil leakage—ensuring a service life of over 80,000 km without oil replenishment. The outer housing is made of high-strength aluminum alloy (ADC12) with a hard anodized finish, providing corrosion resistance against road salt, coolant, and engine oil (passing 500-hour salt spray testing). It operates stably in an extreme temperature range of -40℃ to 120℃, adapting to harsh conditions like cold winter plateaus or high-temperature desert transportation, without performance degradation

Designed for hassle-free installation, the assembly comes with pre-applied high-temperature thread lock (Loctite 243) on the mounting bolts and a alignment mark for quick positioning. The entire installation process takes 25-30 minutes with standard tools (socket wrench and torque wrench), requiring only torque calibration (45-50 N·m for mounting bolts) to ensure proper fit. For maintenance, the assembly’s modular design allows independent replacement of the thermostat or seal (if leakage occurs) without disassembling the entire coupling. Additionally, the absence of electronic components reduces the risk of failure, lowering long-term maintenance costs for fleet operators