Method of lubricating an internal combustion engine

Inactive Publication Date: 2017-03-16
THE LUBRIZOL CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The patent allows for a reduction in the accumulation of oil mist separator filter pluggage and slimy / sludgy deposits in internal combustion engines. This is achieved by using open or closed crankcase ventilation systems that filter crankcase gases and prevent the build-up of pressure in the crankcase. Open crankcase ventilation removes combustion products through external ventilation, while closed crankcase ventilation filters the gases and sends them back into the intake system.

Problems solved by technology

Centrifugal oil mist separators often become plugged with a deposit (consistency varies from slimy / sludgy to hard-tacky) which, if enough deposits are collected, reduces the efficiency and / or completely disables the device and allows oil to drip out of the engine.
This problem is believed to be particularly apparent in heavy duty diesel engines.

Method used

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  • Method of lubricating an internal combustion engine
  • Method of lubricating an internal combustion engine
  • Method of lubricating an internal combustion engine

Examples

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examples

[0137]Soot Dispersing Molecule A—Polyisobutylene-based soot dispersant (EXA). 500 mL of 2M hydrochloric acid is added to a one-liter 4-neck flask equipped with an overhead stirrer, thermowell, addition funnel with nitrogen line, and condenser. 184.2 g of 4-aminodiphenylamine (also described as N-phenyl-p-phenylenediamine) is added, and the flask is heated to 75° C. The addition funnel is then charged with 40.5 g of a 37% formaldehyde solution and the solution is added drop-wise to the flask over a period of 30 minutes. The flask is maintained at 100° C. for 4 hours. The flask is then cooled to ambient temperature. 80 g of a 50 / 50 wt / wt solution of sodium hydroxide in water is added over 30 minutes. At the end of the reaction, a solid product is obtained via filtration. This material may be described as a hydrocarbyl-coupled polyaromatic amine.

[0138]A three-liter, 4-neck flask equipped with an overhead stirrer, thermowell, subsurface inlet with nitrogen line, and Dean-Stark trap with...

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Abstract

The invention provides a method of lubricating an internal combustion engine equipped with a centrifugal oil mist separator, wherein the lubricant contains 0.1 wt % to 8 wt % soot resulting from operation of the engine, and wherein the lubricant composition comprises an oil of lubricating viscosity, and 0.2 wt % to 3 wt % of a soot dispersing additive, wherein the soot dispersing additive comprises a polymer chain having a number average molecular weight of 500 to 20,000, and wherein the soot dispersing additive has a shear stability index of 0 to 20.

Description

FIELD OF INVENTION[0001]The invention provides a method of lubricating an internal combustion engine equipped with a centrifugal oil mist separator, wherein the lubricant contains 0.1 wt % to 8 wt % soot resulting from operation of the engine, and wherein the lubricant composition comprises an oil of lubricating viscosity, and 0.2 wt % to 3 wt % of a soot dispersing additive, wherein the soot dispersing additive comprises a polymer chain having a number average molecular weight of 500 to 20,000, and a shear stability index of 0 to 20.BACKGROUND OF THE INVENTION[0002]Equipment manufacturers in recent years having been designing internal combustion engines in ways to assist in the reduction of various greenhouse gases or particulate matter and / or they have been using after treatment devices such as diesel particulate filters, or SCR (selective catalytic reduction). A recent development in engine design has been to incorporate a centrifugal oil mist separator into engines, typically di...

Claims

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Application Information

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IPC IPC(8): C10M149/12C10M169/04
CPCC10M149/12C10M2203/1006C10M2207/026C10M2215/064C10M2215/28C10M2217/06C10M2219/046C10M2223/045C10N2220/021C10N2220/033C10N2230/041C10N2230/52C10N2240/10C10N2230/04C10N2230/10C10M169/04C10M2219/022C10N2020/04C10N2020/019C10N2030/041C10N2030/52C10N2040/255C10N2030/04C10N2030/10C10N2040/25
InventorGALIC RAGUZ, MARYLOOP, JOHN G.TRUONG, MY HANG T.O'RYAN, WILLIAM
OwnerTHE LUBRIZOL CORP