Clutch Torque Capacity Calculator
Estimate the maximum torque your clutch system can transmit without slipping
Results
Design Tips
Enter your parameters to get design suggestions...
Torque vs. Friction Coefficient
Torque vs. Number of Surfaces
Torque vs. Normal Force
Torque vs. Radius
Plate Clutch Formula
T = n × μ × F × Rmean
- T: Torque capacity (N·m)
- n: Number of friction surfaces
- μ: Coefficient of friction
- F: Normal force (N)
- Rmean: Mean effective radius (m)
Cone Clutch Formula
T = (μ × W × Rmean) / sin(α)
- T: Torque capacity (N·m)
- μ: Coefficient of friction
- W: Axial load (N)
- Rmean: Mean effective radius (m)
- α: Cone angle (degrees)
Mean Effective Radius
Rmean = (Router + Rinner) / 2
For more precise calculations, use:
Rmean = (2/3) × (Router3 - Rinner3) / (Router2 - Rinner2)
Diagram Parameters
- Clutch Type Single Plate
- Friction Surfaces 2
- Inner Radius 50 mm
- Outer Radius 100 mm
- Cone Angle 12.5°
Clutch torque capacity is the maximum amount of torque that a clutch can transmit without slipping. It's a critical parameter in clutch design and selection, ensuring the clutch can handle the engine's torque output under various operating conditions.
The torque capacity depends on several factors:
- Friction material properties (coefficient of friction)
- Number of friction surfaces
- Clamping force (normal force)
- Effective radius of the clutch
- For cone clutches: the cone angle
Single Plate Clutch
Most common in passenger vehicles. Features one friction disc between the flywheel and pressure plate. Simple design, easy to maintain, but limited torque capacity.
Multi-Plate Clutch
Used in high-performance vehicles and motorcycles. Multiple alternating friction discs and steel plates provide more friction surfaces in a compact space, increasing torque capacity.
Cone Clutch
Used in some older vehicles and industrial applications. The conical shape provides more surface area and wedging action, allowing higher torque with less axial force. More sensitive to wear and alignment.
Increasing Torque Capacity
- More friction surfaces: Multi-plate clutches can significantly increase capacity
- Higher friction coefficient: Choose better friction materials
- Larger radius: Increases torque arm but requires more space
- Higher clamping force: But requires stronger springs and components
Trade-offs
- Higher torque capacity often means more pedal effort
- More friction surfaces increase cost and complexity
- Larger clutches add weight and rotational inertia
- Aggressive friction materials may reduce clutch life