Method of Lubricating an Internal Combustion Engine

Inactive Publication Date: 2009-12-10
THE LUBRIZOL CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, for a lubricant to perform at an optimum level, the oil film thickness has to provide a balance between being thin enough to spread efficiently over a surface but yet thick enough to provide a continuous film that does not readily evaporate when exposed to engine operating temperatures.
However, the availability of bright stock is diminishing, resulting in high volume uses such as those for 2-stroke or 4-stroke marine or stationary power engines requiring alternative solutions to impart the desired viscometrics in lubricants.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

examples

Marine Diesel Cylinder Lubricants

Invention and Reference Lubricating Oil Compositions

[0091]Lubricating oil compositions are prepared as summarised in Table 1 below. The amounts of sulphonate, phenate and dispersant quoted include the normal amounts of diluent oil associated with additives. Typically the sulphonate, phenate and dispersant contain about 40 wt % of diluent oil.

[0092]Reference oil composition 1 (RF1) is a lubricant containing bright stock (150 BS) and dispersant. Reference oil compositions 2 (RF2) and 3 (RF3) contain polyisobutylene as a thickener, no bright stock. The lubricating oil compositions of the invention 1 (LC1) and 2 (LC2) contain polyisobutylene succinic anhydride, no dispersant and no bright stock.

TABLE 1RF1RF2RF3LC1LC2Formulation Componentswt %Formulated to Kinematic Viscosity19.819.419.519.419.5at 100° C. (ASTM D445) mm2 / s400 TBN sulphonate10.610.610.610.610.6255 TBN phenate10.610.610.610.610.6Dispersant20000Polyisobutylene with Mn of09.5000approximately ...

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Abstract

The present invention relates to a method of lubricating an internal combustion engine with a power output of at least 1600 kilowatts by supplying to the internal combustion engine a lubricating composition containing an oil of lubricating viscosity and at least 0.5 wt % of a hydrocarbyl-substituted carboxylic acid or anhydride thereof. The invention further provides a lubricating composition suitable for the method.

Description

FIELD OF INVENTION[0001]The present invention relates to a method of lubricating an internal combustion engine with a power output of at least 1600 kilowatts with a lubricating composition comprising (a) an oil of lubricating viscosity and (b) at least 0.5 wt % of a hydrocarbyl-substituted carboxylic acid or anhydride thereof. The invention further provides a lubricating composition suitable for the method.BACKGROUND OF THE INVENTION[0002]Lubricant compositions are known to provide a lubricating oil film between different components within an internal combustion engine. The lubricating oil film is known to help provide protection to improve oxidative and thermal stability, to help reduce corrosive and adhesive wear. In addition the lubricant compositions help impart cleanliness to the engine. One of the important features that lubricants have that help in protecting the engine is the lubricating oil film “thickness,” i.e., viscosity. However, for a lubricant to perform at an optimum...

Claims

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Application Information

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IPC IPC(8): C10M129/20C10M129/26C10M129/34
CPCC10M129/93C10M129/26C10M2203/1085C10M2207/028C10M2207/129C10M2207/26C10M2207/262C10M2219/044C10M2219/046C10N2220/022C10N2230/02C10N2230/04C10N2240/102C10M163/00C10N2220/021C10N2020/02C10N2030/02C10N2030/04C10N2040/252C10N2020/04
InventorMAYHEW, ALEXANDRACOOK, STEPHEN J.
OwnerTHE LUBRIZOL CORP