EHD LUBRICATION CHARACTERISTICS OF A NEW-TYPE OF GROUND CYLINDRICAL WORM GEARING

A full thermal elastohydrodynamic analysis of lubrication of a new typ e of cylindrical worm gearing with concave worm profile, ground by a g rinding wheel whose profile consists of two circular arcs, is presente d. The EHD lubrication analysis is based on the simultaneous solution of the Reynolds, elasticity, energy, and Laplace's equations. The oil viscosity variation with respect to pressure and temperature and the d ensity variation with respect to pressure are included. The finite dif ference method and numerical integration have been used to get the sol ution of the highly nonlinear integrodifferential system of governing equations. By using a computer program, the influence of design and op erating parameters of the new type of worm gearing on EHD lubrication characteristics has been investigated. Also, the comparison of the EHD load carrying capacity and of the power losses in the oil film of the new type and of the commonly used cylindrical worm gearings has been carried out.