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Tightening Tests and Friction Coefficients Definition in the Steering Shaft of Front Motorbike Suspension
Author(s) -
Croccolo D.,
Vincenzi N.
Publication year - 2011
Publication title -
strain
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.477
H-Index - 47
eISSN - 1475-1305
pISSN - 0039-2103
DOI - 10.1111/j.1475-1305.2009.00694.x
Subject(s) - torque , strain gauge , thread (computing) , suspension (topology) , wrench , engineering , friction torque , axle , structural engineering , friction coefficient , slip (aerodynamics) , tension (geology) , frictional coefficient , mechanical engineering , materials science , compression (physics) , mathematics , physics , composite material , homotopy , pure mathematics , thermodynamics , aerospace engineering
The steering shaft of front motorbike suspensions is, usually, tightened up the fork by means of a nut and a locknut. The aim of this study is to evaluate the actual relation between the bolt torque and the preloading force of the steering shaft by performing some tightening tests. The bolt torque is given by a torque wrench whereas the preloading force has been evaluated by means of a strain gauge located on the steering shaft. The steering shaft has a hollow section with an external thread so that the strain gauge has been applied on its internal surface. In relating the bolt torque to the bolt tension, the friction coefficients have been accurately calculated: the friction coefficient values increase notably after the first set of tightening tests mainly because of the spoiling of the contact surfaces.