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【概要描述】Discover how ring springs (friction springs) provide efficient shock absorption, energy dissipation, and damping for heavy-duty applications. Learn about their working principle, advantages, material selection, and applications across rail transportation, mining, metallurgy, seismic protection, and industrial machinery.
【概要描述】Discover how ring springs (friction springs) provide efficient shock absorption, energy dissipation, and damping for heavy-duty applications. Learn about their working principle, advantages, material selection, and applications across rail transportation, mining, metallurgy, seismic protection, and industrial machinery.
A ring spring, also known as a friction spring, is a heavy-duty elastic damping component consisting of multiple inner and outer rings with conical surfaces, alternately nested and assembled together.
When subjected to an axial load, the inner and outer rings move relative to each other along their conical contact surfaces. The inner rings contract radially, while the outer rings expand radially. In this process, the spring stores mechanical energy through elastic deformation while simultaneously converting impact energy into heat through friction between the conical surfaces.
After unloading, the elastic restoring force enables the spring to automatically return to its original configuration without requiring an additional resetting mechanism.
This combination of elastic energy storage and frictional energy dissipation gives ring springs excellent energy absorption, damping, and impact resistance. They are particularly suitable for shock absorption, buffering, overload protection, vibration isolation, and noise reduction under heavy-load and high-vibration operating conditions.
Raleigh Spring Elastic Technology (Suqian) Co., Ltd. specializes in the development and manufacture of high-performance ring springs (friction springs). With an experienced technical team that participated in the development of the Chinese national standard GB/T 1972-2023, Raleigh Spring provides both standardized and customized ring spring solutions for demanding industrial applications.
Under axial compression, the conical surfaces of the inner and outer rings are pressed against each other, causing radial elastic deformation of the rings and allowing the spring to store impact energy.
Relative sliding between the conical surfaces generates friction. The direction of friction changes between the loading and unloading stages, creating a closed hysteresis loop.
According to the original technical description, this frictional mechanism can directly dissipate approximately 60%–70% of the impact energy, significantly reducing rebound and secondary impact.
After the load is removed, the elastic restoring force of the metal overcomes the frictional resistance, allowing the spring to return to its original dimensions without requiring an additional resetting mechanism.
The damping effect is relatively insensitive to loading speed, allowing stable damping performance under impact, vibration, and cyclic loading conditions. This makes ring springs effective in suppressing resonance.
Raleigh Spring controls the conical-surface machining process, running-in treatment, and lubrication system to improve the contact ratio between the mating surfaces and maintain stable damping performance.
Compared with helical springs and conventional disc springs of similar volume, ring springs can provide significantly higher energy absorption capacity.
Even within limited radial space, they can withstand impact loads ranging from several tons to hundreds of tons, while maintaining a compact and lightweight structure.
Standard damping performance can reach approximately 60%–66%. Through optimization of the lubrication system, the damping level can be adjusted within approximately 33%–66%.
This enables rapid dissipation of impact energy and significantly reduces rebound forces and secondary impact.
The load capacity and available buffering stroke can be flexibly adjusted by increasing or decreasing the number of inner and outer ring pairs.
Raleigh Spring can develop customized ring springs with diameters ranging from Φ18 mm to Φ500 mm, providing solutions for various non-standard operating conditions.
Ring springs can withstand impact loads, cyclic vibration, and short-term overloads, making them suitable for demanding industrial and mining environments.
Their load-deflection characteristics are relatively insensitive to loading rate, enabling stable performance even under high-speed impact conditions.
Ring springs can be directly integrated into buffers and damping assemblies, helping simplify the overall vibration and shock-absorption system.
With comprehensive capabilities in material selection, heat treatment, surface treatment, and product inspection, Raleigh Spring's ring spring solutions have been applied to a wide range of industrial equipment.
Typical applications include rail transportation, construction machinery, mining equipment, metallurgy, seismic isolation, marine equipment, defense-related equipment, and general machinery.
Raleigh Spring can also provide load testing and fatigue-life verification to support product reliability.
Operating conditions:
Longitudinal impact caused by train starting, braking, and coupler collisions, as well as vibration suppression in bogies.
Technical solutions:
Coupler draft gears and axle-box damping assemblies.
Application value:
Ring springs absorb collision impact during train coupling, attenuate longitudinal vibration, protect vehicle structures, and improve passenger comfort. They are widely used in applications involving multiple-unit trains and freight locomotives.
Operating conditions:
Crushers, large excavators, mining dump trucks, lifting equipment, and other machinery exposed to sudden impact and heavy-load vibration.
Technical solutions:
Equipment buffers, overload protection assemblies, and anti-collision limiting components.
Application value:
Ring springs absorb impact caused by material blockage, lifting and lowering operations, and other sudden loads. They help prevent damage caused by hard mechanical contact, reduce dynamic stress throughout the machine, and improve overall impact resistance and reliability.
Operating conditions:
Forging hammers, presses, rolling mills, and other equipment exposed to severe instantaneous impact and foundation vibration.
Technical solutions:
Forging hammer anvil cushioning assemblies and rolling mill vibration-damping modules.
Application value:
Ring springs reduce forging impact, suppress equipment rebound, and reduce vibration transmitted to the foundation, thereby protecting both the machine structure and its supporting foundation.
Operating conditions:
Buildings and bridges requiring both energy dissipation and self-resetting capability during seismic events.
Technical solutions:
Ring-spring self-resetting friction dampers and seismic isolation bearings.
Application value:
During an earthquake, ring springs dissipate seismic energy and help restore the structure after the event, reducing residual deformation. They can also serve as an alternative to some high-cost SMA-based damping solutions.
Operating conditions:
Shock protection for shipboard equipment, recoil buffering for artillery systems, and landing-gear buffering.
Technical solutions:
Shock-resistant buffering assemblies and recoil damping units.
Application value:
Ring springs can withstand explosive shock and severe overload conditions while maintaining stable damping performance in demanding environments.
Operating conditions:
Heavy-duty equipment positioning and limiting, overload protection, and vibration reduction in reciprocating mechanisms.
Technical solutions:
Integrated friction-spring buffering units.
Application value:
The integrated design simplifies the vibration-control system while providing both buffering and overload-protection functions.
Alloy spring steels are commonly used for ring springs. For applications involving high wear resistance or elevated temperatures, specialized alloy steels can be selected.
Appropriate heat treatment is essential to achieve the required strength, toughness, and fatigue resistance.
Raleigh Spring strictly controls raw material quality. After heat treatment, hardness is controlled within 48–54 HRC, with phosphating, black oxide, and other corrosion-protection surface treatments available.
The cone angle has a direct influence on spring stiffness and damping characteristics.
Surface treatment and specialized lubricating grease are used to control the coefficient of friction, stabilize damping performance, and reduce wear.
The contact ratio between the conical surfaces of the inner and outer rings is one of the critical performance indicators.
The number of inner and outer ring pairs should be determined according to the maximum impact load and required effective buffering stroke.
Raleigh Spring engineers can provide simulation calculations and parameter-matching support to help optimize the ring spring configuration.
For high-temperature, humid, or dusty environments, the surface protection, lubrication, and maintenance systems should be optimized according to the actual operating conditions.
For applications involving repeated impact, wear of the friction surfaces should be carefully evaluated. An appropriate lubrication and maintenance interval should be established based on the actual operating conditions.
Because the friction surfaces are subject to wear, regular lubrication and maintenance may be required. Ring springs are therefore not ideally suited to applications requiring completely maintenance-free operation.
Damping performance is affected by lubrication conditions. At elevated temperatures, changes in lubricant performance may affect damping characteristics, so temperature-related verification should be conducted during product selection and design.
Compared with disc springs, ring springs require higher manufacturing accuracy for their components and generally involve higher manufacturing costs.
Ring springs, also known as friction springs, utilize a unique mechanism combining frictional energy dissipation with elastic restoring force to overcome the limitations of conventional springs, which primarily provide energy storage but have relatively limited energy-dissipation capability.
Under heavy-load impact and severe vibration conditions, ring springs can provide highly efficient shock absorption and damping in a compact package.
With nearly two decades of experience in elastic component development, Raleigh Spring Elastic Technology (Suqian) Co., Ltd. provides one-stop technical services covering solution design, material selection, process manufacturing, and performance testing.
Through modular and customized ring spring solutions, Raleigh Spring supports customers across rail transportation, mining and construction machinery, metallurgy, seismic protection, special equipment, and other demanding industries with reliable heavy-duty shock-absorption and damping solutions.
