Seat belt retractor mechanisms require reliable return force and stable operation. The spring must support smooth retraction while meeting durability and safety-related expectations.
Common applications
- Automotive seat belt retractors
- Safety belt return mechanisms
- Compact rotary spring assemblies
- High-cycle retraction systems
Key design inputs
- Torque output and working turns
- Belt load and retraction speed
- Housing size and arbor structure
- Cycle life, noise, and safety margin
Selection notes
Retractor spring design should balance comfort and return force. Too much torque can affect user feel, while too little torque may cause incomplete retraction.
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FAQ
What type of spring is used in seat belt retractors?
Power springs are commonly used because they can store and release rotational energy in a compact housing.
What is important for retractor spring life?
Material, stress level, lubrication, winding design, and housing fit are important.
Can retractor springs be customized?
Yes. Torque, size, material, and working turns can be designed for the specific retractor structure.