IEC has been the exclusive partner to Schnorr for products in the UK for many decades, including supplying high-performance disc springs to a range of industries. One of our most significant contributions is to the Airbus A350 programme, where our disc springs play a crucial role in various actuator systems, including the Electrical Thrust Reverser Actuation System (eTRAS). This case study explores the technical function of these components, their application within aircraft systems, and the significance of IEC’s contribution.
The Role of Disc Springs in Aircraft Actuation Systems
Schnorr Disc Springs are used in several types of actuators and related assemblies within the aerospace industry. They are frequently employed in torque limiters to prevent overrun or reverse actuation caused by loadings.
Disc springs serve several critical mechanical and functional roles. These precision-engineered components provide controlled force and energy absorption, ensuring the actuation system operates with high efficiency and reliability. Within aircraft actuation systems, disc springs contribute to:
- Load Bearing & Energy Storage: Providing preloading force to ensure controlled movement and prevent mechanical failure under extreme loads.
- Vibration Damping & Shock Absorption: Minimising stress on surrounding components and extending operational lifespan.
- Precision Control of Actuation Forces: Offering predictable load-deflection characteristics for accurate force application.
- Consistent Performance in Extreme Conditions: Manufactured from high-performance alloys such as 51CrV4 or stainless steel to withstand wide temperature variations.
Disc Spring Requirements
The springs used in modern aircraft applications must meet stringent requirements beyond standard specifications. These include:
- Wide Operating Temperature Range: Necessitating the use of materials like 51CrV4 or stainless steel.
- High Accuracy: Often requiring two load points with tight tolerances.
- Customisation: Some applications specify design features not normally covered by EN 16983.
Application Notes
Aerospace systems generally incorporate disc springs within secondary control systems such as high-lift mechanisms, engine nacelles, and landing gear. These systems rely on actuators for flaps, slats, wing tip brakes, cover opening, and thrust reversal operations.
Disc springs in actuators are also commonly used to prevent overloading and reverse operation, functioning similarly to a sprag clutch in no-back actuators. This is the case with the A350 eTRAS where the actuators are used to control the thrust reverser systems of the aircraft. Working closely with the customer, the Engineers at IEC and Schnorr developed reliable, producible springs that are outside of the normal design parameters set out in EN 16983, the spring design standard.
IEC’s Contribution to the Airbus A350 Programme
IEC’s expertise in sourcing and supplying premium actuator disc springs has made us an integral part of the Airbus A350 programme. Our role includes:
- Technical Support & Consultation: Assisting with material selection, spring configurations, and load calculations.
- Reliable Supply Chain Management: Ensuring a continuous and dependable local supply of high-quality components to keep production lines rolling.
- Commitment to Quality: Supplying aerospace-grade disc springs that meet rigorous fatigue resistance, corrosion protection, and durability standards.
- Quality Control & Compliance: IEC’s EN/AS 9120 certification manages the risk of non-conforming or counterfeit product entering the supply chain.
Application Benefits for the Airbus A350
By integrating IEC-supplied Schnorr disc springs into key aircraft systems, the Airbus A350 benefits from:
- Enhanced Safety & Reliability: Preventing mechanical failures in crucial actuation systems.
- Optimised Weight & Space Efficiency: Compact yet high-force components enabling efficient design.
- Reduced Maintenance Requirements: Long-lasting durability minimising replacement needs.
IEC’s expertise in providing critical components for advanced aviation systems is evident in our contribution to the Airbus A350 programme. Our high-quality Schnorr disc springs play an essential role in the performance and reliability of multiple aircraft actuation systems, directly enhancing safety, efficiency, and operational success. As we continue to support leading aerospace innovations, IEC remains committed to delivering engineering excellence, high-precision components, and superior customer service.
For more information on our products and services, visit https://iecltd.co.uk/product/disc-springs/
