The graphs on this page shows typical test stand results for a viscous coupling. It involves running the viscous coupling in what looks like a lathe. Each half of the viscous coupling are separately fixed, representing the front and rear wheel sets. The test run involves increasing the torque on the coupling and measuring the temperature. The temperature sensor sits on the housing of the coupling as it is turned. The cycle is computer controlled and the result graphs are as you see here. The left hand side of the graph is scaled in Newton metres and the bottom scale is temperature in degrees centigrade. Figure 1 shows a faulty coupling in that the red result line is outside the green upper and lower limits. |
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Figure 2 shows the results graph for the same viscous coupling after it has been reconditioned and set up for a 16v transfer box. It can be clearly seen that the red results line is now within limits. This ensures the coupling does not put the transfer box under excessive strain and that the maximum design drive is delivered to the rear wheel set, as required. |
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| July 2, 2004 |