2020 Volume 65 Issue 8 Pages 511-516
This article presents the grease lubrication technology which contributes to the torque reduction of the rolling bearing used for the motor. The effects of the stirring resistance which is generated when the ball and retainer push aside the grease are great in grease lubricated ball bearings. In addition to the yield stress, the viscous transfer stress and viscosity lowering energy are known to be the barometer of the fluidity of grease which affects the stirring resistance. It is reported that there is the correlation between the meniscus length and channeling properties of grease. Furthermore, the microscopic infrared spectroscopy revealed that types of grease affected the formation of the deposited film of the thickener. The method of the quantitation for the fluidity or formation of the lubricated film with using the atomic force microscope and confocal laser fluorescence microscope were reported, and the possibility of the torque reduction was expected with controlling these parameters.