EN 14766:2005 - 64_e_stf - Baltik vairas

EN 14766:2005 (E)Dimension in millimetresKeya) Setting "zero" deflectionb) Application of the test force1 Rigid mount incorporating head bearings2 Deflection measuring device3 Test adaptor4 Brake mounting-point4.9.7.2.2 Test methodFigure 36 — Fork for hub/disc-brake – static brake-torque testMount the fork in a fixture representative of the head-tube and gripped in the normal head-bearings. Fit an axle tothe fork, and mount on the axle a pivoted, L-shaped adaptor as shown in Figure 36 to provide a torque-arm of330 mm in length and a suitable attachment for the brake mounting-point. Secure the fork against rotation aboutthe stem-axis without constraining it in a bending sense.Locate suitable measuring devices on both fork-blades at the axle location as shown in Figure 36 a) and apply aforce of 100 N to the torque-arm and in a direction against the direction of travel. Remove and re-apply this forceuntil consistent deflection readings are obtained and record the vertical positions of the two blades.Remove the measuring devices and apply a force of 1 000 N to the torque arm in a direction parallel to the forkstemaxis, towards the fork-crown, and parallel to the plane of the wheel as shown in Figure 36 b), and maintainthis force for 1 min. Remove the test force and, if the fork is a suspension-type, allow it to return to its normal length.Replace the deflection devices, re-apply the 100 N force (see Figure 36 a)), and record any permanent set of thetwo blades.4.9.7.3 Fork for hub/disc-brake – repeated brake-torque test4.9.7.3.1 RequirementWhen tested by the method described in 4.9.7.3.2, there shall be no fractures or visible cracks in any part of thefork and, in the case of suspension-forks, there shall be no separation of any parts.59