Solid anti-friction devices – materials therefor – lubricant or se – Lubricants or separants for moving solid surfaces and... – Heavy metal or aluminum in an organic phosphorus compound...
Patent
1996-02-09
1997-02-25
Howard, Jacqueline V.
Solid anti-friction devices, materials therefor, lubricant or se
Lubricants or separants for moving solid surfaces and...
Heavy metal or aluminum in an organic phosphorus compound...
508443, 508563, C10M14106, C10M14112
Patent
active
056058802
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The present invention relates to a novel lubricating oil composition, more specifically, a lubricating oil composition having a high heat performance, a high stability to oxidation, and low friction characteristics. The lubricating oil composition is suitable as a lubricating oil for internal combustion engines, automatic speed regulators, shock absorbers, power steering, etc., and is especially suitable as a lubricating oil for internal combustion engines.
BACKGROUND OF THE INVENTION
Conventionally, for internal combustion engines, a lubricating oil is used to smooth the operation of driving apparatus such as automatic speed regulators, shock absorbers, power steering, and gears. Especially, lubricating oils for internal combustion engines (engine oils), besides lubricating various engine parts such as valve gear mechanisms, including mainly piston rings, cylinder liners, bearings of crank shafts and connecting rods, cams, and valve lifters, also act to cool engines, clean and disperse combustion products, and prevent rust and corrosion.
As stated above, various performances are required for lubricating oils for internal combustion engines. Also, recently, under circumstances wherein there are high performances and power outputs in internal combustion engines and wherein they are under severe operating conditions, high performances have been required. Thus to satisfy such required performances, various additives such as a wear-preventive agent, a metal detergent, an ash-free detergent dispersant, an anti-oxidant, etc., are compounded in the lubricating oils for internal combustion engines.
For the fundamental performances of lubricating oils for internal combustion engines it is especially important to make engines act smoothly under various conditions and to prevent wear and seizing. The parts of engines that are lubricated are almost in a fluid-lubricating state. However, the top and bottom dead centers of valve gear systems and pistons tend to be in a boundary lubrication state. The wear-prevention properties under such a boundary lubrication state are typically imparted by adding zinc dithiophosphate (ZnDTP) or zinc dithiocarbamate (ZnDTC).
Since in an internal combustion engine the loss of energy from frictional parts, on which a lubricating oil acts, is high, for measures to decrease friction loss and fuel consumption loss lubricating oils are used in which a friction modifier and various additives are added (for example, see Japanese Patent Publication No. 3-23595). Lubricating oils for automotive internal combustion engines are used under various conditions, such as various oil temperatures, number of revolutions, and loads. Thus to further improve fuel consumption loss they are required to be excellent in friction characteristics under a wide range of used conditions.
Also, for performances that are required in lubricating oils for internal combustion engines, besides those stated above, high heat-resistant properties, a high stability to oxidation, and proper viscosity properties, are exemplified.
SUMMARY OF THE INVENTION
Under these circumstances the object of the present invention resides in providing a lubricating oil composition having, besides low friction characteristics, high heat-resistant properties, a high stability to oxidation, and proper viscosity properties, and that is especially suitable for lubricating oils for internal combustion engines.
As a result of the extensive study by the inventors of the present invention to develop a lubricating oil composition having the above preferred properties, they have found that the above object is attained with a composition obtained by containing, in a lubricating base oil having a low content of aromatic ingredients and specified properties, a specified amine-type anti-oxidative agent, oxymolybdenum sulfide dithiocarbamate (MoDTC), or oxymolybdenum sulfide organophosphorodithioate (MoDTP), in a given ratio. Based on this finding they accomplished the present invention.
That is, the present invention relates to
REFERENCES:
patent: 3505225 (1970-04-01), Wheeler
patent: 4501678 (1985-02-01), Katayama et al.
patent: 4529526 (1985-07-01), Inoue et al.
patent: 4704216 (1987-11-01), Hata et al.
patent: 4812246 (1989-03-01), Yabe
patent: 5445749 (1995-08-01), Hong
Arai Katsuya
Tomizawa Hirotaka
Bakun Estelle C.
Exxon Chemical Patents Inc.
Howard Jacqueline V.
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