Chevron Spring Selection Guide for Railway Bogie Applications

Chevron springs are a fundamental component of railway bogie primary suspension systems. Their distinctive V-shaped rubber-metal laminate construction delivers a combination of mechanical properties that conventional steel coil springs cannot match in railway applications. Selecting the correct chevron spring requires understanding the load-deflection requirements, the operating environment, and the relevant fire safety standards.

How Chevron Springs Work

A chevron spring consists of alternating layers of rubber and steel arranged in a V or W profile. When loaded vertically, the rubber layers compress while the steel plates constrain lateral movement, giving the spring a high ratio of vertical compliance to lateral stiffness. This property is ideally suited to railway primary suspension, where the wheelset must be free to move vertically over track irregularities while remaining well-guided laterally for safe curve negotiation.

Key Selection Parameters

• Static vertical stiffness (Kv): Determines ride height and primary natural frequency under nominal axle load.
• Lateral stiffness (Kh): Controls wheelset guidance and influences curving performance and wheel-rail wear.
• Progressive rate: The degree to which stiffness increases with deflection, affecting ride at light load and crash protection at extreme deflection.
• Natural rubber hardness: Typically 55–70 Shore A. Softer gives better ride but lower load capacity; harder gives higher capacity but stiffer ride.
• Fatigue life: Specified in millions of cycles at maximum service deflection amplitude.

Our Chevron Spring Products

• 3115 9150 99 — Chevron Spring Component. Metro and passenger rail primary suspension.
• 551 549 77 — Railway Bogie Spring Element. Light rail and commuter rail applications.

Related primary suspension elements: 3115 2472 00, 551 594 54, 3128 3039 30.

EN 45545-2 Fire Safety

For passenger rail applications, chevron springs must comply with EN 45545-2 fire performance requirements. Both our chevron spring products are available with EN 45545-2 HL2 and HL3 certification, documented by accredited laboratory test reports. This certification is increasingly required in US transit procurement specifications.

Ordering and Lead Times

Standard chevron spring products are typically available from stock or within 2–4 weeks for volume orders. Custom specifications require engineering review and sample approval before production. Contact our railway division with your bogie type, nominal axle load, and required stiffness values for a technical proposal.