Tester for elastohydrodynamic lubricating oil film traction with spinning

Abstract

A ball groove type tester used for testing elastohydrodynamic lubricating oil film traction with spinning comprises a large base plate, a stepped shaft, a small base plate, an electric spindle I, an electric spindle II, a coupler, a groove test piece, a ball test piece, a linear guide track, a V-shaped groove, a worm and gear mechanism, a lever-pulley loading mechanism and a traction sensor. The large base plate is connected with the small base plate through the stepped shaft, a worm gear is installed on the stepped shaft, and a worm shaft is installed on the large base plate to control the worm gear to rotate. The electric spindle II and the groove test piece are fixed on the small base plate, the ball test piece is fixed on the end portion of the electric spindle I installed in the V-shaped groove fixed on the movable portion of the linear guide track, and loading of the ball test piece on the groove test piece is achieved through a weight and the lever-pulley loading mechanism. The tester can simulate the elastohydrodynamic lubricating state of two contact pieces under oval contact in the sliding state with different spinning quantities and can accurately measure elastohydrodynamic traction of a lubricant.

Description

technical field [0001] The invention relates to a tester, in particular to a ball-groove tester for testing the traction force of an elastohydrodynamic lubricating oil film with spin. Background technique [0002] Elastohydrodynamic lubrication (referred to as elastohydrodynamic lubrication) is a common form of lubrication for many point and line contact parts in engineering. Its research needs to consider both the elastic deformation of two relatively moving solid surfaces and the rheological properties of the lubricant between the contact surfaces. , Semi / full toroidal continuously variable transmission, rolling bearings and other transmission contact parts are in the state of elastohydrodynamic lubrication in most cases. A layer of elastohydrodynamic lubricating oil film will be formed between the two contacts in the state of elastohydrodynamic lubrication. The elastohydrodynamic traction characteristics of the oil film have a great influence on the dynamic behavior of tr...

AI Technical Summary

Problems solved by technology

[0003] At present, double-disc testing machines or ball-disc testing machines are generally used to test the traction characteristics of lubricants, but they have some shortcomings: 1. Cannot continuously simulate the state of elastohydrodynamic lubrication under different spin conditions

2. By adjusting the angle between the rotation axes of the two contact surfaces to introduce different spin amounts, the adjustment process is more complicated

3. The existing loading device generally adopts hydraulic loading. Due to the defects of hydraulic loading such as leakage and instability, the loading force cannot be accurately obtained

4. The existing ball-on-disk testing machine realizes point (circle) contact, but cannot realize point (ellipse) contact

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