No. 4, 1998 - Tribology in Industry

engine s, where there are restrictions on particulate emisr;ir:-rl.
Investigations show that in totai particulate emission
in Diesel engines, the engine oil's conrrit-.ution is
irhaur- 35Va, \,blatiiiqv of certain base oils is presented in
Figrre 1.
l{i;:li puri|1 cf base orls provides for excellent oxidation
:tabiiity, which is a means of preventilg oil degradaticn
if'92).In that rvay longer drain interval is achieved.
ring technniogies of the basic components of industrial
lubrir:iints beccimcs an iniperlitive.
However, iii ccrrparison to automctive lubricants, in
industrial lubricants the activities aimed at Cefining the
standard perfbrmances are limited. This is due to a great
variery of equipuient, industries, fieid of lubricant applicatic,n
and working conditions to which these iubricants
are exi)c3ed. This leads to an extremely large number of
products of various characteristics.
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|-igure 2. Oxi'Tation stabikty of diffarcnt hase. oil,s
J"2. Gear oils
Tbere are numerous factors that influence the development
c.f lubricating oils for gears. Growing specific loads
of gearr cltments have as a consequence high thermal and
ricchanic'ai straining of oils. Reducing mechanicalosses
jn r.c.:is i:; also an irnportant task of their Iubricatiugoils.
European manufiicturers strive to extend the drain intervais
of oils cr to eiiminate oil replacement. i.e. their
thoice is for permanent lubrication. Automatic transmissian
is becoming more common with European car manufaciurcrs
too.
Thc facts cited above determine the necessary properties
of iiiture gear oils, and these are: high oxidation stability,
convenient frictional characteristics, good iow temperati:r,:
behavior, low volatilify, high natural viscosity index,
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