1. Core Function of the Flywheel

In a jaw crusher, the flywheel is not only a transmission component, but also a critical element for energy storage and system balance. Since the motor delivers continuous power while crushing is an intermittent impact process, the flywheel:

• Stores and releases kinetic energy.

• Reduces peak motor load.

• Improves operational stability and efficiency.

It acts as an energy buffer and stabilizer. 

2. Energy Storage Principle

E = 1/2 Iω²

Where E is kinetic energy, I is moment of inertia, and ω is angular velocity. Greater mass and higher speed allow more energy storage, which is released during crushing cycles.

3. Structure and Working Mechanism

A jaw crusher typically has two flywheels:

Right Flywheel (Driving Wheel)

• Connected to the motor via belt.

• Transmits power and stores energy.

• Through the eccentric shaft, converts rotary motion into reciprocating motion of the pitman.

Left Flywheel (Balance Wheel)

• Not involved in transmission.

• Acts as counterweight.

• Reduces vibration and ensures system balance.

4. Material Selection and Industry Standards

Cast Steel:

• ZG230-460, etc.

• High strength, suitable for heavy-duty conditions.

Ductile Iron:

• QT450-10.

• Cost-effective, good damping.

Grey Cast Iron:

• EN1561 GJL-HB235.

• Good casting and damping performance.

Industry Reference:

• Metso: EN1561 GJL-HB235.

• Trio: QT450-10.

5. Key Quality Control Factors

• Casting quality (porosity, shrinkage).

• Material consistency.

• Machining accuracy (concentricity, bore tolerance, dynamic balance).

Poor control may cause vibration, bearing damage, or misalignment.

6. Manufacturing Challenges and Capability Requirements

• Flywheels can exceed 10 tons.

• Require high-capacity furnaces.

• Strict control of cooling and internal stress.

Key challenges:

• Prevent deformation.

• Avoid cracks and shrinkage.

• Ensure structural integrity.

Manufacturing Capability:

Experience in producing flywheels approaching 10-ton class ensures stable quality.

7. Conclusion

The flywheel plays key roles in transmission, energy storage, and balancing. Its performance depends on material, casting, machining, and balancing, making it essential for stable crusher operation.

Hyton provides one-stop wear and spare parts solution for C series jaw crushers. Here are the specific part numbers for the C series Flywheel. Please refer to them：