Lubrication film thickness measuring system and method

Details Lubrication film thickness measuring system and method Lubrication film thickness measuring system and method

1987-04-27

1991-03-19

Eisenzopf, Reinhard J.

Electricity: measuring and testing

Impedance, admittance or other quantities representative of...

Lumped type parameters

324683, 340631, 73 64, G01R 2726, G01N 3330

Patent

active

050014358

ABSTRACT:
A lubricating film thickness measuring system and method includes a rolling element bearing having a relatively rotatable electrically insulated inner and outer races forming a raceway therebetween. Rolling elements are movably mounted in the raceway. Apparatus is provided for measuring capacitance across the bearing. The measuring apparatus includes an oscillator circuit and a phase detection circuit and is responsive to a phase angle shift between a first signal going from an oscillator circuit to the bearing and from the bearing to the phase detection circuit, and a second signal received by the phase detection circuit directly from the oscillator circuit. The method involves applying a predetermined electrical signal across the rolling elements and measuring the capacitance across the rolling elements thereby providing a measure of the lubricating film thickness.

REFERENCES:
patent: 4345203 (1982-08-01), Vermeiren et al.
patent: 4471295 (1984-09-01), Vermeiren
patent: 4511837 (1985-04-01), Vermeiren et al.
patent: 4675596 (1987-06-01), Smith
patent: 4728943 (1988-03-01), Vermeiren
patent: 4733556 (1988-03-01), Meitzler et al.

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