EN 14766:2005 - 64_e_stf - Baltik vairas

EN 14766:2005 (E)Key1 Low-mass roller (see Figure 27)2 360 mm drop height3 22,5 kg striker4 Rigid mount incorporating head bearings4.9.5.1.2 Test methodFigure 34 — Front fork – rearward impact testMount the fork in a fixture representative of the head-tube and gripped in the normal bearings as shown inFigure 34. Assemble a roller of mass less than 1 kg and with dimensions conforming to those shown in Figure 27 inthe fork.Rest a striker of mass 22,5 kg on the roller in the fork drop-outs such that it is exerting a force against the directionof travel and in the plane of the wheel. Position a deflection measuring device under the roller and record theposition of the underside of the roller in a direction perpendicular to the axis of the fork-stem and in the plane of thewheel and note the vertical position of the fork.Remove the deflection measuring device, raise the striker through a height of 360 mm and release it to strike theroller against the rake of the fork. The striker will bounce and this is normal. When the striker has come to rest onthe roller, measure the permanent set under the roller.4.9.5.2 Crown/stem joint assembled by press-fitting, bonding, or clamping4.9.5.2.1 RequirementWhen tested by the method described in 4.9.5.2.2 a), if there are any fractures or visible cracks in any part of thefork, and the permanent set, measured as the displacement of the axis of the wheel-axle or simulated axle inrelation to the axis of the fork-stem, exceeds 45 mm, the fork shall be considered to have failed. If the fork meetsthese criteria then it shall be subjected to a second test as described in 4.9.5.2.2 b), after which, it shall exhibit nofractures or visible cracks; if it meets these latter criteria, then irrespective of the amount of permanent set, thereshall be no relative movement between the stem and the crown when the assembly is subjected to a torque of80 Nm applied and maintained for 1 min in each direction of possible rotation about the stem axis.56