Flywheel

A flywheel is a mechanical component used in machinery to store rotational energy. In a jaw crusher, the flywheel is a heavy wheel mounted on the eccentric shaft. It stores kinetic energy during the non-crushing phase (the return stroke) and releases it during the crushing stroke, ensuring smooth operation, reducing power fluctuations, and maintaining a consistent crushing force. The flywheel rotates with the eccentric shaft, driven by the motor. During the return stroke, when material is not being crushed, the motor accelerates the flywheel, storing kinetic energy. During the crushing stroke, the flywheel releases this stored energy to assist the motor in overcoming the high resistance of crushing hard materials, ensuring continuous and efficient operation. Flywheels are typically made from cast iron, cast steel, or forged steel. Key parameters include moment of inertia (0.5–500 kg·m²), maximum speed (3000–15000 rpm), energy storage capacity (10–5000 kJ), balancing grade (G2.5–G6.3 per ISO 1940-1), material grade (QT500-7–QT800-2 per GB/T 1348), maximum operating temperature (80–150 °C), surface hardness (HB 190–HB 280 per GB/T 231.1), outer diameter (200–2000 mm), weight (50–5000 kg), and bore diameter (50–500 mm). These values are reference ranges and must be verified for the specific model and application. The flywheel's design must match the machine envelope and shaft size. Proper balancing is critical to avoid vibration and extend bearing life. Operating temperature limits must be respected to prevent material degradation. Surface hardness affects wear resistance. When selecting a flywheel, confirm the required moment of inertia, speed, and energy storage capacity with the equipment manufacturer. Verify that the balancing grade and material grade meet the application's requirements. Always check the actual dimensions and weight for installation. For maintenance, monitor for excessive vibration, which may indicate imbalance or wear. Overheating can signal overloading or inadequate cooling. Failure boundaries include exceeding maximum speed or temperature, which can cause material failure. Always consult the legal manufacturer or supplier to confirm model-specific values and standards.

The flywheel rotates with the eccentric shaft driven by the motor. During the return stroke of the jaw (when material is not being crushed), the motor accelerates the flywheel, storing kinetic energy. During the crushing stroke, the flywheel releases this stored energy to assist the motor in overcoming the high resistance of crushing hard materials, ensuring continuous and efficient operation.