Adhesion of gear and transmission lubricants

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.

Desirable characteristics in gear and transmission lubricants

A number of characteristics, which were not evident in the discussion of functions of gear lubricants, contribute to satisfactory application of such products. After listing some of these qualities, consideration will be given as to what contributes to such characteristics. Such qualities include:

(a)    Adhesion

(b)   Compatibility

(c)    Freedomfrom separation

(d)   Minimumaction on other components of mechanisms, as seals, etc

(e)   Oiliness

(f)     Oxidation  stability

(g)    Satisfactory demulsibility

(h)   Satisfactory detergency

(i)    Satisfactory foam inhibition

(j)    Satisfactory viscosity temperature characteristics

(k)      Shear stability

(l)   Reasonable cost.