Crank pulley assembly

The utility model discloses a crank pulley assembly, including belt pulley, friction disc no. 1, yielding rubber, wheel hub, friction disc no. 2 and signal disc, connect through the yielding rubber between belt pulley and the wheel hub, skin belt pulley hub goes up the pressure equipment has the signal disc, be equipped with the hypodontia on the signal disc, have edentulous signal disc and bent axle synchronous revolution, provide the rotational speed signal for the engine, install friction disc no. 1 and friction disc no. 2 between belt pulley and the signal disc, friction disc no. 1 is installed respectively on belt pulley and signal disc with friction disc no. 2. The utility model discloses can reduce engine crankshaft rotation angle, can read the engine speed, it has great angle displacement to permit between belt pulley and the wheel hub, can make belt output more stable simultaneously, have simple structure, advantage that the product integrated level is high, can also reduce the undulant problem of be