Browse Publications Technical Papers 2012-36-0288
2012-10-02

A Prevailing Torque Nut with Incorporated Washer: A Solution for Rear and Front Axle Fastening 2012-36-0288

Wheel hubs typically are set in vehicles through nuts with self-locking feature to assure safety. That feature may be done by an external component like a cotter pin, a deformable element incorporated to the nut like polyamide or metallic insert or some controlled mechanical deformation applied right on nut body.
Nuts with some self-locking elements are being used in order to eliminate cotter pins from the system. However, during the maintenance of vehicles, some disadvantages appear like damage in thread axle due disassembling, considering controlled mechanical deformation nuts or the replacement of nut with polyamide insert to assure self-lock featuring.
This paper presents a solution to replace a fastening in a current front and rear wheel-hub for a passenger vehicle. The study is made comparing a current solution, a controlled mechanical deformed nut - stover type - from a polyamide insert nut and an innovative prevailing torque nut with incorporated washer.
The solution presents a fastener that does not require any element or post process to get a self-locking feature and allows its reutilization. The incorporated washer provides system maintenance cost reduction, has the advantage to be reused without axle's thread damage disassembling and is error proof during assembling against a missing washer in the system.

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