Friction of Sliding Leadscrew under Hydrodynamic Lubrication : 2nd Report, Verification of Drunkenness-model Theory and Consideration on Proper Driving Condition

Abstract

The theory proposed in the previous report is verified experimentally. The proposed theory is based on the clearance shape model with respect to the drunkenness error of the female thread, and the frictional characteristics of sliding leadscrew are described under hydro dynamic condition by some dimensionless numbers derived from infinitely short bearing theory. To verify the proposed theory, some experiments are performed on several specimens which have different nominal designations. The experimental results are arranged by dimensionless S number and M number, and they are compared to the theoretical results. The experimental results agree with the theoretical results in the range of hydro dynamic condition, so that the propriety of the proposed theory is verified. The proper driving condition is considered based on the theory and the experimental results, and the selection criterion for the proper oil viscosity is shown.