Engine front end gear train with decoupling pulley

The utility model provides an engine front end wheel train with a decoupling belt pulley, and relates to the technical field of engine wheel trains. Comprising a decoupling belt pulley, a generator belt pulley, a water pump belt pulley, an air conditioner compressor belt pulley, an automatic tensioning wheel, an upper idle wheel, a lower idle wheel and a poly V-belt. The decoupling belt pulley comprises a belt pulley body, an actuator and at least one spring are arranged in the belt pulley body, the actuator is in running fit with the belt pulley body, and the actuator is driven by an external shaft; the actuator is provided with at least two blades, the spring is clamped in the belt pulley body and tightly abuts against the inner wall of the belt pulley body, and the adjacent blades can abut against the two ends of the spring. The decoupling belt pulley has the driving function of a crude oil pump belt pulley, most torsional vibration energy transmitted by a crankshaft gear is absorbed through the spring wit