Adhesion is a comparative
term, and what is in mind in this case is stickiness which will insure that the
lubricant will resist the action of centrifugal force and thus remain on the
gear teeth. This quality is most important in the case of open gears. Desirable
adhesion is obtained by the use of high molecular weight and high softening
point compounds. That is, asphaltic residua, resins, and polymers are largely
used for the purpose. Which this type of product is desirable for open gears,
it is not suitable for most gear sets because of its high fluid friction and
poor cooling effect.
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