Researches on the Pitting of Power Transmitting Spur Gears : 4th Report, Experimental Studies of the Lubricating Film between Two Rolling Rollers

Abstract

It was reported by the 3rd report that the viscosity of lubricants and the peripheral speed of the gears remarkably affect the endurance limit of the pitting. These facts indicate the importance of the lubrication to the pitting. In this report, the experimental studies of the lubricating film is presented. The film thickness was obtained by measuring the electric capcity between the two rolling rollers. Comparing the measured film thickness with the customary theoretical values of two kinds, the one obtained by assuming the constant viscosity of lubricant and the other by taking into account the changes of the viscosity under the pressure, the measured film thickness did not coincide with the theoretical values precisely. So, for the further theoretical analysis of lubricating film, the film temperature and the elastic deformation of rollers should be taken into consideration.