New Test Method for Oil Aeration Evaluation or Air Entrainment Properties of EV Drive Fluids (EDF) and Other Transmission Fluids at High Temperature using an Optical Imaging of Liquids (OILPAS) System
1. Scope
1.1 This test method uses a bench rig for quick evaluation of the aeration characteristics of a oil at entraining and dispersing free air. This applies to evaluating the fluid performance that may be used in electric drivetrain. This is a screening method for evaluating the aereation characteristics of a large number of sample candidates as a pre-selection for further validation with actual physical hardware testing.
1.2 The test uses a set of gears submerged in a oil sample to disperse free air, to simulate real-life conditions. The Optical Imaging of Liquids (OILPAS) system is used for direct measurement of air volume in oil by measuring the entrained air bubbles in the fluid. It also measures air bubble diameter as an additional characteristic for evaluation.
1.3 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use.
Keywords
foam; foaming; air release; ATF; Benchtop; Electrification; Air Entrainment; High Speed; Low Volume; Surfactants; Antifoam; Transmission; GMAER; COAT; EDF; bench top
Rationale
This standard is needed by oil additive producers, lubricant manufacturers, and manufacturers of EVD and other original equipment as a bench screening test method. It provides insightful measurment of oil aeration that contributes to understanding the air entrainment characteristics using an affordable, fast, and reliable test. It provides a shorter pathway to evaluation within any additive, lubricant, or hardware development project.
