Dual Coil Torsion Spring For Automotive Interior Parts

Core Features

Dual Coil Configuration – Two coiled spring bodies are connected by a center section, with one coil wound clockwise and the other counterclockwise. The coils work in parallel, providing torque capacity compared to single torsion springs of the same dimensions .

Bi-Directional Loading Capability – The spring can be twisted in both directions from the neutral position, supporting applications requiring both positive torque for actuation and reactive torque for controlled deceleration .

Precision Force Control – The dual-coil design enables fine-tuning through adjustments to wire diameter and number of windings in the inner coil, allowing the spring to be tuned within defined limits for specific load requirements .

Automotive Interior Application – Designed specifically for automotive seat mechanisms, retractor systems, and hinge assemblies requiring reliable performance under repeated load cycles and defined environmental conditions.

Product Characteristics

The spring is manufactured with two coiled spring bodies connected by a center section. The coil diameters and wire thickness are dimensioned to provide specified torque characteristics. The dual-coil configuration allows the spring to deliver torque capacity compared to single torsion spring designs of equivalent outer diameter .

Material composition is controlled to meet specified strength and fatigue resistance requirements. Spring steel grades are available for general applications, with stainless steel options for corrosion-resistant requirements. The spring rate can be customized within a range from 0.1N/mm to 10N/mm based on application requirements .

Surface treatment options include zinc plating for corrosion resistance, phosphate coating for lubricant retention, and other finishes based on environmental exposure conditions . The spring may be guided on a shaft pin during operation, with clearance maintained between the inner diameter and the shaft .

Application Scenarios

Automotive Seat Adjustment Systems – Used in seat cushion mechanisms where the spring provides urging force for seat positioning. The dual-coil configuration provides bi-directional torque control for seat folding and return functions.

Seat Belt Retraction Mechanisms – Applied in seat belt retractor assemblies where the spring provides consistent retraction force and controlled tension management for passenger safety systems.

Vehicle Interior Hinge Assemblies – Employed in glove box doors, armrests, and console compartments where the spring provides rotational force for opening and closing functions.

Automotive Curtain Systems – Used in automotive curtain mechanisms requiring torsion and extension capabilities for precise movement control .

Customization Options

Specifications and configurations can be adjusted based on application requirements. Coil diameters, wire thickness, number of windings, and spring rate are customizable according to application geometry. Material grades include spring steel for general applications and stainless steel for corrosion-resistant requirements. Surface treatments are selectable according to environmental exposure conditions, including zinc plating, phosphate coating, and other finishes.

Frequently Asked Questions

Q: What is the difference between a dual coil torsion spring and a single torsion spring?
A: A dual coil torsion spring consists of two coiled spring bodies connected by a center section, with one coil wound clockwise and the other counterclockwise. The coils work in parallel, providing torque capacity compared to a single torsion spring of the same dimensions .

Q: What is the temperature rating for dual coil torsion springs?
A: The operating temperature range depends on material selection. Standard spring steel grades typically operate within -20°C to 80°C, while stainless steel grades can extend the range from -40°C to 150°C for extreme climate applications .

Q: Can these springs be supplied in non-standard dimensions?
A: Custom wire diameters, coil diameters, and number of windings can be manufactured upon request, subject to tooling availability and minimum order quantity requirements .

Q: What is the recommended installation method for dual coil torsion springs?
A: The spring is typically guided on a shaft pin or similar, with clearance between the inner diameter and the shaft. The center section is fixed while the coil ends attach to the components requiring rotational force .

Q: What surface treatments are available?
A: Surface treatments include zinc plating, phosphate coating, and other finishes based on corrosion resistance requirements and environmental exposure conditions.

Installation Considerations

The spring should be installed with the center section fixed to the stationary component and the coil ends attached to the moving component. The spring should be guided on a shaft pin with clearance between the inner diameter and the shaft . The dual coils work in parallel, with one coil wound clockwise and the other counterclockwise to provide balanced torque output. For applications requiring specified torque values, the spring should be installed at the defined preload position. The spring should not be designed for use by winding backwards, as this may reduce performance and fatigue life . Thread condition of mounting points should be inspected before installation. For plated or coated springs, coating thickness should be within specified tolerances to maintain fit with mating components. When used in applications involving frequent cycling, the spring material and design should be evaluated against fatigue life requirements.