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A new generation of shaft nuts
LISI AEROSPACEdeveloped this year an innovative
system for shaft nut locking. Named EVERLOK™,
it allows to the removal of the splines cut on the
power transmission shafts or the aircraft moving
structures articulations (wing slats and flaps,
etc.), onwhich these specialty nuts are used. The
most critical applications have so far combined a
special, largenut (up to250mm indiameter) witha
complexsystemofsplinesontheshaftandalocking
washer to secure the assembly. The EVERLOK™
solution, which greatly facilitates the installation
of the device, has successfully passed the most
demanding vibration tests andevenexceeded the
locking performance of current solutions.
GAINS / BENEFITS
Weight saving
Reduced complexity of transmission
shafts (removal of splines)
Simple and fast installation /
visual lock indicator
Reusable (no component to replace)
Lower overall cost
A snap screw
To meet the challenges of lightening and optimi-
zationthatthemarketdemands,LISIAUTOMOTIVE
innovateswiththe“Vis-Clip”(SnapScrew),aunique
combinationofitsknow-howinscrewsandclipped
fasteners. Definedas a trueunidentified fastening
object, the “Vis-Clip” was designed to replace the
screws for fastening thermal protection shields.
Snapped upon assembly and unscrewable upon
disassembly, it allows for easy and ultrafast
assembly.Thispatentedsolution,alreadymarketed
byseveralmajorcarmakers,hasnewversionsunder
development.
GAINS / BENEFITS
Assembly time reduced by 20 seconds
per vehicle.
100g decrease in the fastener’s weight
(factor - 5)
LISI AUTOMOTIVE
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INNOVATION