| 摘要 |
<p>PROBLEM TO BE SOLVED: To solve the problem that the thickness of a film processed trough the surface treating can not be measured unless a clutch plate is destroyed, and so the thickness of the film processed in the surface treating is measured using the spot check, and there is such a risk that a desired torque property can not be obtained in the coupling torque test after the installation. SOLUTION: The method is provided with a control clutch 22 composed of an inner clutch plate 31 and an outer clutch plate 32, at least one of which is processed trough the surface treating, and tests the thickness of the surface treated layer of the clutch plate being used for an electromagnetic friction clutch which makes the inner clutch plate 31 and the outer clutch plate 32 of the control clutch 22 frictionally engage to each other using the magnetic force of attraction. In the method, the magnetic flux passing through the clutch plate is varied by changing the current flowing in an exciting coil 52, and then the induced electromotive force is detected by a detecting coil 53, and the thickness of the film formed on the clutch plate through the surface treating is measured.</p> |
