PORTABLE DEMONSTRATION APPARATUS AND METHOD FOR THE COMPARISON OF LUBRICANTS AND/OR LUBRICANT ADDITIVES

摘要

A portable apparatus and method for demonstrating differentcharacteristics of different fluids that includes different fluid sumps orchambersfor receiving samples of the different fluids. A test shaft having differentportionsthat are immersed in the different fluid samples in the chambers is driven byanelectric drive motor at a substantially constant speed while substantially thesameamount of friction or force is applied to the different portions of the testshaft atdifferent times to increase the resistance presented to the drive motor. Theadditional amount of current drawn or power absorbed by the motor or straininduced in the motor drive shaft during the application of such friction orforce tothe different portions of the test shaft is monitored and compared to provideacomparison of the friction or power loss characteristics of the differentfluidsamples.