Engineers from TFC were faced with a problem when asked by a leading automotive electric motor OEM's to supply a 33mm external retaining ring capable of withstanding rotational speeds in excess of 17,000rpm.
Conventional external retaining rings (circlips) are limited by centrifugal forces when the forces involved are sufficient to lift the ring out of the groove and, in this case, standard Spirolox® rings could only be considered suitable for rotational speeds of around 8,000rpm.
The solution was found by supplying a special custom designed 'self-locking' ring that allowed the ring to function properly at higher rpm's. The self-locking feature utilises a small tab on the inside turn of the ring that locks into a corresponding slot on the outside turn. In addition to withstanding higher rotational speeds, the ring is also capable of sustaining vibration, functioning under rapid acceleration and absorb a degree of impact loading.
All Smalley Spirolox rings from TFC are manufactured using a unique edge-winding process which is as flexible as it is precise and accommodates design changes without the need for additional tooling or die modifications. This process facilitates the development of prototypes allowing the production of low quantity custom orders quickly and economically. Even after the initial prototypes are produced, the same process allows the design to be altered with simple machine adjustments or even a change of raw material size.
Having spent a decade in the fastener industry experiencing every facet – from steel mills, fastener manufacturers, wholesalers, distributors, as well as machinery builders and plating + coating companies, Claire has developed an in-depth knowledge of all things fasteners.
Alongside visiting numerous companies, exhibitions and conferences around the world, Claire has also interviewed high profile figures – focusing on key topics impacting the sector and making sure readers stay up to date with the latest developments within the industry.
