Theoritical analysis and calculation for thermal load of the speed - regulating clutch using liquid viscosity have been carried out by means of the thermal conduction theory

obtaining distribution curves of the radial transient temperature field and of the radial transient stress field; and through further analysis the deformation and failure mechanism

as well as deformation form of friction wafers in the said clutch have been obtained

and effective solutions having been put forward. The conclusion of theoritkal study and measures of solution have been verified through tests.