METHOD FOR CHECKING THE CORRECT ASSEMBLING OF A TWIN-TUBE HYDRAULIC SHOCK-ABSORBER, PARTICULARLY FOR A VEHICLE SUSPENSION

摘要

Method for checking the correct assembling of a twin-tube hydraulic shock-absorber, par- ticularly for a vehicle suspension The method comprises the steps of: a) measuring the Barkhausen noise on the outer cylin- drical tube (12) of the shock-absorber (10) before a final closing step by which the outer cylindrical tube (12) is closed at its top end so as to lock a sealing member (30) in its posi- tion, clamping it with a given axial compression load; b) measuring the Barkhausen noise on the outer cylindrical tube (12) once the final closing step has been carried out; c) calcu- lating the difference (Δmp) between the Barkhausen noise measured at step b) and the Barkhausen noise measured at step a); and d) comparing the difference (Δmp) calculated at step c) with a given minimum level of difference, which minimum level is selected in ad- vance in such a manner that said difference (Δmp) is higher than said minimum level when the shock-absorber (10) is correctly assembled, i.e. when the outer cylindrical tube (12) is correctly closed at its top end, whereas said difference (Δmp) is lower than said minimum level when the shock-absorber (10) is not correctly assembled, i.e. when the outer cylindri- cal tube (12) is not correctly closed at its top end.