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Directive 94/20/EC of the European Parliament and of the Council (repealed)Show full title
Directive 94/20/EC of the European Parliament and of the Council of 30 May 1994 relating to the mechanical coupling devices of motor vehicles and their trailers and their attachment to those vehicles (repealed)
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- Revised 01/11/20140.44 MB
- Revised 01/07/20131.55 MB
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4.6.2. Static tests
4.6.2.1.Standard fifth wheel couplings designed for a steering wedge or similar device for the positive steering of semi-trailers (see Annex V, Section 7.9) must be tested for adequate strength by means of a static bending test within the working range of the steering device with the simultaneous application of fifth wheel load. The maximum permitted fifth wheel load U must be applied vertically on the coupling in its operating position by means of a rigid plate of sufficient size to cover the coupling completely.
The resultant of the applied load must pass through the centre of the horizontal joint of the fifth wheel coupling.
Simultaneously, a horizontal lateral force, representing the force needed for positive steering of the semi-trailer, must be applied to the flanks of the guide for the coupling pin. The magnitude of this force and the direction in which it acts must be chosen so that a moment of 0,75 m X D is exerted about the centre of the coupling pin. The moment should be applied by means of a force acting on a lever arm 0,5 m long. Permanent (plastic) distortion up to 0,5 % of all nominal dimensions is permitted. There must be no cracking.
4.6.2.2.A static lifting test must be performed on all fifth wheel couplings. Up to a lifting force of FA = g · U there must be no major permanent bending of the coupling plate over more than 0,2 % of its width.
In the case of Class G 50 standard fifth wheel couplings and comparable couplings for the same coupling pin diameter there must be no separation of the coupling pin from the coupling with a lifting force of
FA = g · 2,5 · U.
The force should be applied by means of a lever bearing on the coupling plate at one end and being raised at the other end at a distance of 1,0 to 1,5 m from the centre of the coupling pin (see Figure 29).
The lever arm must be at 90o to the direction of entry of the coupling pin into the coupling. If the worst case is obvious, this worst case has to be tested. If the worst case is not easy to determine, the technical service shall decide which side to test. No second test shall be required.
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