Borrelly Ondufil™ wave spring is manufactured using a new technology that consists in winding and rolling a flat wire corresponding to the width of the coil.
Based on this technology, Borrelly Ondufil™ wave spring offers a solution for new requirements including compact housing, higher required deflections in the field of elastic deformation and various demanded range of spring rates.
In comparison with helical compression springs, Borrelly Ondufil™ wave spring offers space savings. For identical force and deflection, Borrelly wave spring enable to reduce overall housing from 50 to 75%.
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Borrelly Ondufil™ wave spring custom design
Borrelly Ondufil™ wave springs are simultaneously wound and rolled. Edges are not stamped or cut, consequently free of stamping cracks. Cracks are source of stresses concentration, and they are playing a crucial role regarding perfomance and lifetime of springs.
Unlike stamping process, wave springs fibres are not parallel but concentric. Laminating direction of rectangular flat wire is exactly the direction of bending stresses to which wave springs are subjected.
Parts show better aptitude to creep and relaxation. Hysteresis and energy dispersion are reduced, mechanical efficiency of Borrelly Ondufil™ wave springs is increased.
While Borrelly Ondufil™ wave springs are being used in fatigue, friction between components (main cause of overheating therefore energy losses) are no longer to be considered. Hysteresis of Borrelly Ondufil™ wave springs is then the only cause of thermal dispersion.
Because material is working in better conditions (natural rolling direction of fibers), mechanical efficiency and lifetime of wave springs are higher than some equivalent washers stacking.
Geometry of wave spring
Open overlap and gap type geometry of Borrelly Ondufil™ wave springs enable to center the spring in a bore, even allowing a slight tightening.
In comparison to Borrelly Ondulée™ wave washer, Borrelly Ondufil™ wave springs diameters do not change whatever the working heights are.
Those two kinds of wave springs are mainly used for short deflection and medium / heavy loads.
Borrelly Ondufil™ multiturn wave spring : Technology enables to roll and wind an unlimited number of turns.
Waves per turn are offset by a half pitch.
Total force is equivalent to one turn, whereas deflection is multiplied by the number of turns. Spring rate of wave springs decreases proportionnaly to the number of turns
Upper and lower turns can be wavy or flat. Shim ends geometry avoids the use of support rings and provide a 360° contact surface.
Parallel Borrelly Ondufil™ wave spring: waves per turn are parallel and perfectly stacked. Deflection is equal to single turn wave spring whereas load is multiplied by the number of turns.
Borrelly Rondufil™ round wire wave spring: those round wire wave springs are designed and manufactured to meet heavy loads. They can be a technical alternative to Borrelly Belleville disc springs, while having similar loads and more accurate spring rates.
Mounting of wave spring
Open overlap and gap type geometry of Borrelly Ondufil™ wave springs enable to center the spring in a bore, even allowing a slight tightening. In comparison to Borrelly Ondulée™ wave washer, Borrelly Ondufil™ wave springs diameters do not change whatever the compressed heights are.
For Borrelly Ondufil™ multiturn or parallel wave springs, centering can be realized over a shaft or a bore. It is necessary to keep from 0.30 to 1.00 mm mounting play for spring diameters from 20 to 120 mm.
Application of wave spring
|Aerospace connectors||Preloading the seat of a ball valve||Mechanical seal|