EP1724330B1 - Verwendung von Schmierölzusammensetzungen zur Verschleissreduzierung von mit drehendem Zapfer versehenen Personenkraftwagenmotoren - Google Patents

Verwendung von Schmierölzusammensetzungen zur Verschleissreduzierung von mit drehendem Zapfer versehenen Personenkraftwagenmotoren Download PDF

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Publication number
EP1724330B1
EP1724330B1 EP06112913A EP06112913A EP1724330B1 EP 1724330 B1 EP1724330 B1 EP 1724330B1 EP 06112913 A EP06112913 A EP 06112913A EP 06112913 A EP06112913 A EP 06112913A EP 1724330 B1 EP1724330 B1 EP 1724330B1
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Prior art keywords
mass
lubricating oil
less
lubricating
tappet
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French (fr)
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EP1724330A1 (de
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Robert William Shaw
Christopher J. Locke
Angela J. Dr. Keeney
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Infineum International Ltd
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Infineum International Ltd
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    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
    • C10M171/00—Lubricating compositions characterised by purely physical criteria, e.g. containing as base-material, thickener or additive, ingredients which are characterised exclusively by their numerically specified physical properties, i.e. containing ingredients which are physically well-defined but for which the chemical nature is either unspecified or only very vaguely indicated
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10N—INDEXING SCHEME ASSOCIATED WITH SUBCLASS C10M RELATING TO LUBRICATING COMPOSITIONS
    • C10N2030/00—Specified physical or chemical properties which is improved by the additive characterising the lubricating composition, e.g. multifunctional additives
    • C10N2030/06—Oiliness; Film-strength; Anti-wear; Resistance to extreme pressure
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10N—INDEXING SCHEME ASSOCIATED WITH SUBCLASS C10M RELATING TO LUBRICATING COMPOSITIONS
    • C10N2030/00—Specified physical or chemical properties which is improved by the additive characterising the lubricating composition, e.g. multifunctional additives
    • C10N2030/40—Low content or no content compositions
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10N—INDEXING SCHEME ASSOCIATED WITH SUBCLASS C10M RELATING TO LUBRICATING COMPOSITIONS
    • C10N2030/00—Specified physical or chemical properties which is improved by the additive characterising the lubricating composition, e.g. multifunctional additives
    • C10N2030/40—Low content or no content compositions
    • C10N2030/42—Phosphor free or low phosphor content compositions
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10N—INDEXING SCHEME ASSOCIATED WITH SUBCLASS C10M RELATING TO LUBRICATING COMPOSITIONS
    • C10N2030/00—Specified physical or chemical properties which is improved by the additive characterising the lubricating composition, e.g. multifunctional additives
    • C10N2030/40—Low content or no content compositions
    • C10N2030/44—Boron free or low content boron compositions
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10N—INDEXING SCHEME ASSOCIATED WITH SUBCLASS C10M RELATING TO LUBRICATING COMPOSITIONS
    • C10N2030/00—Specified physical or chemical properties which is improved by the additive characterising the lubricating composition, e.g. multifunctional additives
    • C10N2030/40—Low content or no content compositions
    • C10N2030/45—Ash-less or low ash content
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10N—INDEXING SCHEME ASSOCIATED WITH SUBCLASS C10M RELATING TO LUBRICATING COMPOSITIONS
    • C10N2030/00—Specified physical or chemical properties which is improved by the additive characterising the lubricating composition, e.g. multifunctional additives
    • C10N2030/52—Base number [TBN]
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10N—INDEXING SCHEME ASSOCIATED WITH SUBCLASS C10M RELATING TO LUBRICATING COMPOSITIONS
    • C10N2030/00—Specified physical or chemical properties which is improved by the additive characterising the lubricating composition, e.g. multifunctional additives
    • C10N2030/54—Fuel economy
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10N—INDEXING SCHEME ASSOCIATED WITH SUBCLASS C10M RELATING TO LUBRICATING COMPOSITIONS
    • C10N2040/00—Specified use or application for which the lubricating composition is intended
    • C10N2040/25—Internal-combustion engines
    • C10N2040/252—Diesel engines
    • C10N2040/253—Small diesel engines
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10N—INDEXING SCHEME ASSOCIATED WITH SUBCLASS C10M RELATING TO LUBRICATING COMPOSITIONS
    • C10N2040/00—Specified use or application for which the lubricating composition is intended
    • C10N2040/25—Internal-combustion engines
    • C10N2040/255—Gasoline engines

Definitions

  • the present invention relates to passenger car motor vehicle lubricating oil compositions.
  • the present invention relates to use of a passenger car motor vehicle lubricating oil compositions which exhibit improved wear performance of a rotating tappet in an internal combustion engine having a cam and rotating tappet.
  • Lubricating oil compositions used to lubricate internal combustion engines comprise a base oil of lubricating viscosity, or a mixture of such oils, and additives used to improve the performance characteristics of the oil.
  • additives are used to improve detergency, to reduce engine wear, to provide stability against oxidation, to reduce friction loss, to increase fuel economy and to inhibit corrosion.
  • Some additives provide multiple benefits, such as dispersant-viscosity modifiers.
  • Other additives, whilst improving one characteristic of the lubricating oil are detrimental to another characteristic.
  • friction modifiers such as molybdenum-containing compounds, and/or organic friction modifiers, such as glycerol mono-oleate, in passenger car motor vehicles to reduce friction between moving engine parts and to improve fuel economy.
  • US Patent Nos. 4,164,473 and 4,479,883 disclose various oil-soluble molybdenum containing compounds suitable as friction reducing additives for use in passenger car motor vehicles.
  • US Patent No. 6,723,685 discloses a composition comprising a molybdenum additive and an organic friction modifier, in an amount sufficient to pass a Sequence VIB fuel economy test.
  • US 2003/0148895 A discloses lubricating oil compositions intended to reduce wear in the Peugeot TU3M Scuffing Test. This test is intended to investigate wear on the cam and tappets of an internal combustion engine.
  • the disclosures of this document show that relatively high levels of boron (derived from borated dispersant) and preferably augmented with significant amount of molybdenum (derived from, e.g., a trinuclear molybdenum additive) are required to reduce cam and tappet wear to acceptable levels.
  • WO 03/064568 A2 discloses lubricating oil compositions for use with low sulfur fuels in internal combustion engines.
  • the lubricating oils when tested in a Sequence IVA test, result in increased wear (cam nose wear and total wear) as the molybdenum and boron concentrations thereof are reduced. Other disadvantageous effects are also apparent.
  • Preferred embodiments of the present invention relate to use of a lubricating oil composition in an engine comprising a rotating tappet to provide improved wear performance, particularly in lower SAPS formulations.
  • the present invention provides use of lubricating a lubricant oil composition for reducing wear of a rotating tappet in an internal combustion engine having a cam and a rotating tappet associated with the said cam, the said use being defined by claim 1 of the set of claims following the description of the invention.
  • Preferred and optional features of the invention are the subjects of the claims which are directly or indirectly appended to claim 1.
  • the engine of the present invention is an internal combustion engine, such as a passenger car motor vehicle engine.
  • the engine may be a spark-ignited engine or a compression-ignited engine.
  • the oil of lubricating viscosity useful in the practice of the invention may have a viscosity from about 2 mm 2 /sec (centistokes) to about 40 mm 2 /sec, especially from about 3 mm 2 /sec to about 20 mm 2 /sec, most preferably from about 5 mm 2 /sec to about 15 mm 2 /sec, as measured at 100°C.
  • Natural oils include animal oils and vegetable oils (e.g., castor oil, lard oil); liquid petroleum oils and hydrorefined, solvent-treated or acid-treated mineral oils of the paraffinic, naphthenic and mixed paraffinic-naphthenic types. Oils of lubricating viscosity derived from coal or shale also serve as useful base oils.
  • Synthetic lubricating oils include hydrocarbon oils and halo-substituted hydrocarbon oils such as polymerized and interpolymerized olefins (e.g., polybutylenes, polypropylenes, propylene-isobutylene copolymers, chlorinated polybutylenes, poly(1-hexenes), poly(1-octenes), poly(1-decenes)); alkylbenzenes (e.g., dodecylbenzenes, tetradecylbenzenes, dinonylbenzenes, di(2-ethylhexyl)benzenes); polyphenyls (e.g., biphenyls, terphenyls, alkylated polyphenols); and alkylated diphenyl ethers and alkylated diphenyl sulfides and derivative, analogs and homologs thereof.
  • Alkylene oxide polymers and interpolymers and derivatives thereof where the terminal hydroxyl groups have been modified by esterification, etherification, etc. constitute another class of known synthetic lubricating oils. These are exemplified by polyoxyalkylene polymers prepared by polymerization of ethylene oxide or propylene oxide, and the alkyl and aryl ethers of polyoxyalkylene polymers (e.g., methyl-polyiso-propylene glycol ether having a molecular weight of 1000 or diphenyl ether of poly-ethylene glycol having a molecular weight of 1000 to 1500); and mono- and polycarboxylic esters thereof, for example, the acetic acid esters, mixed C 3 -C 8 fatty acid esters and C 13 Oxo acid diester of tetraethylene glycol.
  • polyoxyalkylene polymers prepared by polymerization of ethylene oxide or propylene oxide
  • alkyl and aryl ethers of polyoxyalkylene polymers e.g.
  • Another suitable class of synthetic lubricating oils comprises the esters of dicarboxylic acids (e.g., phthalic acid, succinic acid, alkyl succinic acids and alkenyl succinic acids, maleic acid, azelaic acid, suberic acid, sebasic acid, fumaric acid, adipic acid, linoleic acid dimer, malonic acid, alkylmalonic acids, alkenyl malonic acids) with a variety of alcohols (e.g., butyl alcohol, hexyl alcohol, dodecyl alcohol, 2-ethylhexyl alcohol, ethylene glycol, diethylene glycol monoether, propylene glycol).
  • dicarboxylic acids e.g., phthalic acid, succinic acid, alkyl succinic acids and alkenyl succinic acids, maleic acid, azelaic acid, suberic acid, sebasic acid, fumaric acid, adipic acid, linole
  • esters includes dibutyl adipate, di(2-ethylhexyl) sebacate, di-n-hexyl fumarate, dioctyl sebacate, diisooctyl azelate, diisodecyl azelate, dioctyl phthalate, didecyl phthalate, dieicosyl sebacate, the 2-ethylhexyl diester of linoleic acid dimer, and the complex ester formed by reacting one mole of sebacic acid with two moles of tetraethylene glycol and two moles of 2-ethylhexanoic acid.
  • Esters useful as synthetic oils also include those made from C 5 to C 12 monocarboxylic acids and polyols and polyol esters such as neopentyl glycol, trimethylolpropane, pentaerythritol, dipentaerythritol and tripentaerythritol.
  • Silicon-based oils such as the polyalkyl-, polyaryl-, polyalkoxy- or polyaryloxysilicone oils and silicate oils comprise another useful class of synthetic lubricants; such oils include tetraethyl silicate, tetraisopropyl silicate, tetra-(2-ethylhexyl)silicate, tetra-(4-methyl-2-ethylhexyl)silicate, tetra-(p-tert-butyl-phenyl) silicate, hexa-(4-methyl-2-ethylhexyl)disiloxane, poly(methyl)siloxanes and poly(methylphenyl)siloxanes.
  • oils include tetraethyl silicate, tetraisopropyl silicate, tetra-(2-ethylhexyl)silicate, tetra-(4-methyl-2-ethylhexy
  • Other synthetic lubricating oils include liquid esters of phosphorous-containing acids (e.g., tricresyl phosphate, trioctyl phosphate, diethyl ester of decylphosphonic acid) and polymeric tetrahydrofurans.
  • base oil examples include gas-to-liquid (“GTL”) base oils, i.e. the base oil may be oil derived from Fischer-Tropsch-synthesised hydrocarbons made from synthesis gas containing hydrogen and carbon monoxide using a Fischer-Tropsch catalyst. These hydrocarbons typically require further processing in order to be useful as base oil. For example, they may, by methods known in the art, be hydroisomerized; hydrocracked and hydroisomerized; dewaxed; or hydroisomerized and dewaxed.
  • GTL gas-to-liquid
  • base stocks and base oils in this invention are the same as those found in the American Petroleum Institute (API) publication 1509 "Engine Oil Licensing and Certification System", Fifteenth Edition, April 2002 , Appendix E, November 2004. Said publication categorizes base stocks as follows:
  • the oil of lubricating viscosity of the present invention may comprise a Group I, Group II, Group III, Group IV or Group V base stock or base oil blends of the aforementioned base stocks.
  • an oil of lubricating viscosity of the present invention comprises a proportion at least of one or more Group IV basestock.
  • a lubricating oil composition according to the present invention comprises at least 25 wt%, preferably at least 35 wt% and more preferably at least 40 wt% of a Group IV base stock, based on the total weight of the composition.
  • a lubricating oil composition according to the present invention comprises less than 85 wt%, preferably less than 75 wt%, more preferably less than 60 wt% and especially less than 55 wt% of a Group IV base stock, based on the total weight of the composition.
  • an oil of lubricating viscosity according to the present invention comprises a proportion at least of one or more Group III basestock.
  • a lubricating oil composition according to the present invention comprises at least 15 wt%, preferably at least 20wt% and more preferably, at least 25 wt% Group III basestock, based on the total weight of the composition.
  • a lubricating oil composition according to the present invention comprises less than 80 wt%, preferably less than 60 wt% and, most preferably, less than 50 wt% of Group III basestock, based on the total weight of the composition.
  • a lubricating composition according to the present invention may comprise one or more Group V ester base stock.
  • the lubricating composition comprises less than 25 wt%, preferably less than 10 wt% and more preferably 5 wt% or less of an ester base stock based on the total weight of the composition.
  • a lubricating oil composition according to the present invention comprises at least 1 wt%, preferably at least 1.5 wt% and more preferably at least 3 wt% of an ester basestock.
  • any of the basestocks mentioned above may be provided to the composition as a separate component for blending. Alternatively, all or a proportion of any of the basestocks may be provided to the composition as a diluent for another component of the lubricating oil composition.
  • substantially free of friction modifier is defined herein as meaning the lubricating oil composition comprises less than 0.1 wt%, suitably less than 0.05 wt% (e.g., 0 to 0.4 wt%), preferably less than 0.01 wt%, such as 0 to 0.0075 wt% and most preferable no (0 wt%) friction modifier.
  • boundary lubricant additives that lower friction coefficients and hence improve fuel economy selected from:
  • a lubricating oil composition according to the present invention suitably comprises less than 1.0 wt% sulphated ash, preferably, less than 0.9wt%, more preferably less than 0.8wt% and particularly less than 0.7 wt% sulphated ash, based on the total weight of the composition.
  • a lubricating oil composition according to the present invention comprises 0.6 wt% or less sulphated ash measured using ASTM D874.
  • a lubricating oil composition according to the present invention suitably comprises less than 0.09 wt%, preferably less than 0.08 wt% and more preferably less than 0.07 wt% phosphorus, based on the total weight of the composition.
  • a lubricating oil composition according to the present invention comprises 0.06 wt% of less phosphorus, based on the total weight of the composition, measured using ASTM D4951.
  • a lubricating oil composition according to the present invention suitably comprises less than 0.4wt%, preferably less than 0.3 wt% and more preferably less than 0.2 wt% sulphur, based on the total weight of the composition, as measured using ASTM 5185 or ASTM 2622.
  • a lubricating oil composition according to the present invention suitably has a total base number (TBN) of 13 or less, preferably less than 10 and more preferably between 4 and 9, as measured using ASTM D2986.
  • TBN total base number
  • a lubricating oil composition according to the present invention may comprise additional conventional additives.
  • suitable additional additives are set out in the following pages.
  • Metal-containing or ash-forming detergents function as both detergents to reduce or remove deposits and as acid neutralizers or rust inhibitors, thereby reducing wear and corrosion and extending engine life.
  • Detergents generally comprise a polar head with a long hydrophobic tail.
  • the polar head comprises a metal salt of an acidic organic compound.
  • the salts may contain a substantially stoichiometric amount of the metal in which case they are usually described as normal or neutral salts, and would typically have a total base number or TBN (as can be measured by ASTM D2896) of from 0 to 80.
  • a large amount of a metal base may be incorporated by reacting excess metal compound (e.g., an oxide or hydroxide) with an acidic gas (e.g., carbon dioxide).
  • the resulting overbased detergent comprises neutralized detergent as the outer layer of a metal base (e.g. carbonate) micelle.
  • Such overbased detergents may have a TBN of 150 or greater, and typically will have
  • Detergents that may be used in a lubricating oil composition according to the present invention include oil-soluble neutral and overbased sulfonates, phenates, sulphurized phenates, thiophosphonates, salicylates, and naphthenates and other oil-soluble carboxylates of a metal, particularly the alkali or alkaline earth metals, e.g., barium, sodium, potassium, lithium, calcium, and magnesium.
  • the most commonly used metals are calcium and magnesium, which may both be present, and mixtures of calcium and/or magnesium with sodium.
  • Particularly convenient metal detergents are neutral and overbased calcium or magnesium sulfonates having TBN of from 20 to 450, neutral and overbased calcium or magnesium phenates and sulphurized phenates having TBN of from 50 to 450 and neutral and overbased magnesium or calcium salicylates having a TBN of from 20 to 450. Combinations of detergents, whether overbased or neutral or both, may be used.
  • Detergents generally useful in the formulation of lubricating oil compositions also include "hybrid" detergents formed with mixed surfactant systems, e.g., phenate/salicylates, sulfonate/phenates, sulfonate/salicylates, sulfonates/phenates/salicylates, as described, for example, in U.S. Patent Nos. 6,153,565 ; 6,281,179 ; 6,429,178 ; and 6,429,179 .
  • the detergent may be present in any suitable amount, within the limits provided by the maximum sulphated ash and sulphur levels of the lubricating oil composition of the present invention.
  • a detergent may be used in an amount providing the lubricating oil composition with from about 0.05 to about 0.30 wt%, such as from about 0.07 to about 0.25 wt%, more preferably from about 0.8 to about 0.22 wt% of calcium, measured as sulfated ash (SASH) content.
  • Ashless dispersants comprise an oil soluble polymeric hydrocarbon backbone bearing one or more functional groups that are capable of associating with particles to be dispersed.
  • the polymer backbone is functionalized by amine, alcohol, amide, or ester polar moieties, often via a bridging group.
  • the ashless dispersant may be, for example, selected from oil soluble salts, esters, amino-esters, amides, imides, and oxazolines of long chain hydrocarbon substituted mono and dicarboxylic acids or their anhydrides; thiocarboxylate derivatives of long chain hydrocarbons; long chain aliphatic hydrocarbons having a polyamine attached directly thereto; and Mannich condensation products formed by condensing a long chain substituted phenol with formaldehyde and polyalkylene polyamine.
  • the oil soluble polymeric hydrocarbon backbone of these dispersants is typically derived from an olefin polymer or polyene, especially polymers comprising a major molar amount (i.e., greater than 50 mole %) of a C 2 to C 18 olefin (e.g., ethylene, propylene, butylene, isobutylene, pentene, octene-1, styrene), and typically a C 2 to C 5 olefin.
  • a C 2 to C 18 olefin e.g., ethylene, propylene, butylene, isobutylene, pentene, octene-1, styrene
  • the oil soluble polymeric hydrocarbon backbone may be a homopolymer (e.g., polypropylene or polyisobutylene) or a copolymer of two or more of such olefins (e.g., copolymers of ethylene and an alpha-olefin such as propylene or butylene, or copolymers of two different alpha-olefins).
  • a homopolymer e.g., polypropylene or polyisobutylene
  • a copolymer of two or more of such olefins e.g., copolymers of ethylene and an alpha-olefin such as propylene or butylene, or copolymers of two different alpha-olefins.
  • copolymers include those in which a minor molar amount of the copolymer monomers, for example, 1 to 10 mole %, is an ⁇ , ⁇ -diene, such as a C 3 to C 22 non-conjugated diolefin (for example, a copolymer of isobutylene and butadiene, or a copolymer of ethylene, propylene and 1,4-hexadiene or 5-ethylidene-2-norbornene).
  • a minor molar amount of the copolymer monomers for example, 1 to 10 mole %
  • a minor molar amount of the copolymer monomers for example, 1 to 10 mole %
  • a minor molar amount of the copolymer monomers for example, 1 to 10 mole %
  • a minor molar amount of the copolymer monomers for example, 1 to 10 mole %
  • a minor molar amount of the copolymer monomers for example,
  • a lubricating oil composition according to the present invention comprises from 0.005 to 0.08 wt%, preferably from 0.01 to 0.08 wt%, most preferably from about 0.05 to 0.08 wt% of total nitrogen.
  • substantially all of the nitrogen in the lubricating oil composition is provided by the dispersant.
  • a lubricating oil composition according to the present invention may comprise one or more borated dispersant.
  • Such dispersants can be borated by conventional means, as generally taught in U.S. Patent Nos. 3,087,936 ; 3,254,025 and 5,430,105 . Boration of the dispersant is readily accomplished by treating an acyl nitrogen-containing dispersant with a boron compound such as boron oxide, boron halide boron acids, and esters of boron acids, in an amount sufficient to provide from about 0.1 to about 20 atomic proportions of boron for each mole of acylated nitrogen composition.
  • a boron compound such as boron oxide, boron halide boron acids, and esters of boron acids
  • lubricating oil compositions of the present invention contain less than 100 ppm of boron, such as less than 90 ppm of boron, more preferably, less than 80 ppm, such as less than 70 ppm of boron.
  • Dihydrocarbyl dithiophosphate metal salts are frequently used as antiwear and antioxidant agents.
  • the metal may be an alkali or alkaline earth metal, or aluminum, lead, tin, molybdenum, manganese, nickel or copper.
  • the zinc salts are most commonly used in lubricating oil in amounts of 0.1 to 10 wt%, preferably 0.2 to 2 wt%, based upon the total weight of the lubricating oil composition. They may be prepared in accordance with known techniques by first forming a dihydrocarbyl dithiophosphoric acid (DDPA), usually by reaction of one or more alcohol or a phenol with P 2 S 5 and then neutralizing the formed DDPA with a zinc compound.
  • DDPA dihydrocarbyl dithiophosphoric acid
  • a dithiophosphoric acid may be made by reacting mixtures of primary and secondary alcohols.
  • multiple dithiophosphoric acids can be prepared where the hydrocarbyl groups on one are entirely secondary in character and the hydrocarbyl groups on the others are entirely primary in character.
  • any basic or neutral zinc compound could be used but the oxides, hydroxides and carbonates are most generally employed.
  • Commercial additives frequently contain an excess of zinc due to the use of an excess of the basic zinc compound in the neutralization reaction.
  • the preferred zinc dihydrocarbyl dithiophosphates are oil soluble salts of dihydrocarbyl dithiophosphoric acids and may be represented by the following formula: wherein R and R' may be the same or different hydrocarbyl radicals containing from 1 to 18, preferably 2 to 12, carbon atoms and including radicals such as alkyl, alkenyl, aryl, arylalkyl, alkaryl and cycloaliphatic radicals. Particularly preferred as R and R' groups are alkyl groups of 2 to 8 carbon atoms.
  • the radicals may, for example, be ethyl, n-propyl, i-propyl, n-butyl, i-butyl, sec-butyl, amyl, n-hexyl, i-hexyl, n-octyl, decyl, dodecyl, octadecyl, 2-ethylhexyl, phenyl, butylphenyl, cyclohexyl, methylcyclopentyl, propenyl, butenyl.
  • the total number of carbon atoms (i.e. R and R') in the dithiophosphoric acid will generally be about 5 or greater.
  • the zinc dihydrocarbyl dithiophosphate can therefore comprise zinc dialkyl dithiophosphates.
  • the lubricating oil compositions of the present invention are capable of providing excellent performance in the presence of amounts of ZDDP providing greater amounts of phosphorus, the improved performance of the inventive lubricating oil compositions are particularly apparent in lower SAPS formulations, which generally have phosphorous levels of no greater than about 0.08 wt% (800 ppm). Therefore, lubricating oil compositions of the present invention suitably contain less than 800 ppm, preferably less than 700 ppm and more preferably 600 ppm or less of phosphorus. Lubricating oil compositions according to the present invention suitably comprise at least 50 ppm, preferably at least 100 ppm and more preferably at least 200 ppm of phosphorus.
  • Oxidation inhibitors or antioxidants reduce the tendency of mineral oils to deteriorate in service. Oxidative deterioration can be evidenced by sludge in the lubricant, varnish-like deposits on the metal surfaces, and by viscosity growth.
  • Oxidative deterioration can be evidenced by sludge in the lubricant, varnish-like deposits on the metal surfaces, and by viscosity growth.
  • Such oxidation inhibitors include hindered phenols, alkaline earth metal salts of alkylphenolthioesters having preferably C 5 to C 12 alkyl side chains, calcium nonylphenol sulfide, oil soluble phenates and sulphurized phenates, phosphosulphurized or sulphurized hydrocarbons or esters, phosphorous esters, ashless and metal-containing thiocarbamates, and oil soluble copper compounds as described in U.S. Patent No. 4,867,890 .
  • Aromatic amines having at least two aromatic groups attached directly to the nitrogen constitute another class of compounds that is frequently used for antioxidancy.
  • Typical oil soluble aromatic amines having at least two aromatic groups attached directly to one amine nitrogen contain from 6 to 16 carbon atoms.
  • the amines may contain more than two aromatic groups.
  • Compounds having a total of at least three aromatic groups in which two aromatic groups are linked by a covalent bond or by an atom or group (e.g., an oxygen or sulphur atom, or a -CO-, - SO 2 - or alkylene group) and two are directly attached to one amine nitrogen also considered aromatic amines having at least two aromatic groups attached directly to the nitrogen.
  • the aromatic rings are typically substituted by one or more substituents selected from alkyl, cycloalkyl, alkoxy, aryloxy, acyl, acylamino, hydroxy, and nitro groups.
  • the amount of any such oil soluble aromatic amines having at least two aromatic groups attached directly to one amine nitrogen should preferably not exceed 0.4 wt% active ingredient.
  • lubricating oil compositions in accordance with the present invention contain from about 0.05 to about 5 wt%, preferably from about 0.10 to about 3 wt%, most preferably from about 0.20 to about 2.5 wt% of phenolic antioxidant, aminic antioxidant, or a combination thereof, based on the total weight of the lubricating oil composition.
  • Lubricating oil compositions according to the present invention may optionally comprise a rust or corrosion inhibitor. Any suitable rust or corrosion inhibitor may be used. As rust inhibitors there may be mentioned nonionic polyoxyalkylene polyols and esters thereof, polyoxyalkylene phenols and anionic alkyl sulfonic acids. Preferably, a lubricating oil composition according to the present invention comprises a succinic acid based rust inhibitor and /or an alkyl substituted phenol ethoxylate.
  • thiadiazole polysulfides containing from 5 to 50 carbon atoms, their derivatives and polymers thereof.
  • Such materials are widely known and disclosed, for example, in US Patent No. 2,719,125 , US Patent No. 4,097,387 and GB Patent No. 1 560 830 .
  • the rust or corrosion inhibitor is suitably present in an amount not exceeding 1.0 wt%, and preferably not exceeding 0.5 wt%, based on the total weight of the composition.
  • Foam control can be provided by an antifoamant of the polysiloxane type, for example, silicone oil or polydimethyl siloxane.
  • Additives which are effective in controlling this viscosity increase include the long chain hydrocarbons functionalized by reaction with mono- or dicarboxylic acids or anhydrides which are used in the preparation of the ashless dispersants as hereinbefore disclosed.
  • the lubricating oil compositions of the present invention contain an effective amount of a long chain hydrocarbons functionalized by reaction with mono- or dicarboxylic acids or anhydrides (e.g., polyisobutenyl succinic anhydride (PIBSA)).
  • PIBSA polyisobutenyl succinic anhydride
  • the viscosity index of the base stock may be increased, or improved, by incorporating therein certain polymeric materials that function as viscosity modifiers (VM) or viscosity index improvers (VII).
  • polymeric materials useful as viscosity modifiers are those having number average molecular weights (Mn) of from about 5,000 to about 250,000, preferably from about 15,000 to about 200,000, more preferably from about 20,000 to about 150,000.
  • Mn number average molecular weights
  • Polymer molecular weight, specifically Mn can be determined by various known techniques. One convenient method is gel permeation chromatography (GPC), which additionally provides molecular weight distribution information (see W. W. Yau, J. J. Kirkland and D. D.
  • a viscosity index improver dispersant functions both as a viscosity index improver and as a dispersant.
  • examples of viscosity index improver dispersants include reaction products of amines, for example polyamines, with a hydrocarbyl-substituted mono -or dicarboxylic acid in which the hydrocarbyl substituent comprises a chain of sufficient length to impart viscosity index improving properties to the compounds.
  • the viscosity index improver dispersant may be, for example, a polymer of a C 4 to C 24 unsaturated ester of vinyl alcohol or a C 3 to C 10 unsaturated mono-carboxylic acid or a C 4 to C 10 di-carboxylic acid with an unsaturated nitrogen-containing monomer having 4 to 20 carbon atoms; a polymer of a C 2 to C 20 olefin with an unsaturated C 3 to C 10 mono- or di-carboxylic acid neutralised with an amine, hydroxyamine or an alcohol; or a polymer of ethylene with a C 3 to C 20 olefin further reacted either by grafting a C 4 to C 20 unsaturated nitrogen-containing monomer thereon or by grafting an unsaturated acid onto the polymer backbone and then reacting carboxylic acid groups of the grafted acid with an amine, hydroxy amine or alcohol.
  • a preferred lubricating oil composition contains a dispersant composition of the present invention, base oil
  • LOFIs lube oil flow improvers
  • Typical additives that improve the low temperature fluidity of the fluid are C 8 to C 18 dialkyl fumarate/vinyl acetate copolymers, and polymethacrylates
  • LOFIs can be grafted with grafting materials such as, for example, maleic anhydride, and the grafted material can be reacted with, for example, amines, amides, nitrogen-containing heterocyclic compounds or alcohol, to form multifunctional additives.
  • additives can also provide a multiplicity of effects; thus for example, a single additive may act as a dispersant-oxidation inhibitor. This approach is well known and need not be further elaborated herein.
  • each additive is typically blended into the base oil in an amount that enables the additive to provide its desired function.
  • Representative effective amounts of such additives, when used in crankcase lubricants, are listed below.
  • additive concentrates comprising additives (concentrates sometimes being referred to as additive packages) whereby several additives can be added simultaneously to the oil to form the lubricating oil composition.
  • the final composition may employ from 5 to 30 wt%, preferably 5 to 25 wt%, typically 10 to 20 wt% of the concentrate, the remainder being oil of lubricating viscosity.
  • oil-soluble or “dispersible” used herein do not necessarily indicate that the compounds or additives are soluble, dissolvable, miscible, or capable of being suspended in the oil in all proportions. These do mean, however, that they are, for instance, soluble or stably dispersible in oil to an extent sufficient to exert their intended effect in the environment in which the oil is employed. Moreover, the additional incorporation of other additives may also permit incorporation of higher levels of a particular additive, if desired.
  • the present invention advantageously provides a method of reducing wear of the rotating tappets in passenger car motor vehicles engines lubricated with lower SAPS lubricants.
  • Fig 1 shows part of an engine valve train comprising a rotating tappet 6. It can be seen from Fig 1 that a cam lobe 2, supported on camshaft 4, contacts the end face of the rotating tappet 6, which is connected to the valve 10.
  • the cam lobe 2 is rotated by rotation of the cam shaft 4 on which it is mounted. There is a point of contact between the cam lobe 2 and the face of the rotating tappet 6.
  • the action of the eccentric shape cam effects linear reciprocating motion of the tappet 6.
  • the tappet 6 In moving to the distal extreme of this linear reciprocating motion (not shown) the tappet 6 actuates the valve 10 and compresses the valve spring 8.
  • the tappet moves back to the proximate extreme of this linear motion (as illustrated in Fig 1 ) by relaxation of the valve spring the valve 10 closes.
  • the cam surface, of which the cam lobe 2 is part remains in continuous contact with the face of the tappet 6.
  • the point of contact between the cam 2 and tappet 6 is off-set from the axis of linear reciprocating motion by distance X. Consequently in addition to the linear reciprocating motion, the rotational motion of the camshaft 4 also translates into rotational motion of the tappet 6 about the axis of linear motion. This motion is clearly illustrated in Fig 2 .
  • the present invention advantageously facilitates rotation of the tappet and reduces stalling of the tappet, thus effecting improved wear performance.
  • compositions described as "comprising" a plurality of defined components are to be construed as including compositions formed by admixing the plurality of defined components.
  • the VW RNT test (Draft PV 1473) is one test used to evaluate cam and tappet wear.
  • the test uses a 1.91 TDI PD, 85 kW VW diesel engine on a static engine bench test. This engine has a rotating tappet and cam design.
  • the test is a continuous test of 650 hour duration. Prior to the test the exhaust cam and tappet (number 1) are irradiated and the wear is monitored on-line using a radio nucleide tracer technique.
  • Oils 1 and 2 are lubricating oil compositions in accordance with the present invention, and comprise no friction modifier.
  • Oils A and B are comparative examples and comprise glycerol monooleate and oleamide friction modifiers.
  • oils 1, 2, A and B had a sulphated ash content of 0.6 wt%, a phosphorus content of 0.06 wt% and a sulphur content of around 0.22 wt%.
  • Each of the exemplified oils was blended to a viscosity grade of 5W-30, according to SAE J300 May 2004.
  • the VW PV 1451 FE test measures fuel economy. It involves comparison of candidate oils against a specified reference oil (CEC RL 191).
  • Oil 2 as above, and Oil C were tested in the VW FE PV1451 test.
  • Oil C corresponds essentially with Oil B of example 1, except that Oil C contained only glycerol monooleate friction modifier.

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  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • General Chemical & Material Sciences (AREA)
  • Oil, Petroleum & Natural Gas (AREA)
  • Organic Chemistry (AREA)
  • Lubricants (AREA)

Claims (9)

  1. Verwendung einer Schmierölzusammensetzung zur Verminderung von Verschleiß eines Rollenstößels in einem Verbrennungsmotor mit Nockenwelle und Rollenstößel, wobei die Verwendung das Schmieren des Motors mit einer Schmierölzusammensetzung umfasst, die einen Phosphorgehalt in einer Menge von 50 bis 900 Masse-ppm, einen Schwefelgehalt in einer Menge von 1500 bis 2000 Masse-ppm, einen Borgehalt in einer Menge von 0,0 bis 100 ppm und einen Gehalt an Sulfatasche in einer Menge, die 1,0 Masse-% nicht überschreitet, aufweist, wobei die Schmierzusammensetzung Basisöl mit Schmierviskosität, Reibungsmodifizierungsmittel in einer Menge von 0,0 bis 0,1 Masse-%, wobei das Reibungsmodifizierungsmittel ausgewählt ist aus einem oder mehreren der folgenden: organische, aschefreie (metallfreie), Stickstofffreie Ester, die durch Umsetzung von Carbonsäuren und Anhydriden mit Alkanolen gebildet werden, Stickstoff enthaltenden Reibungsmodifizierungsmitteln und Molybdänverbindungen, wobei die Mengen sich auf die Masse der vollständig formulierten Schmierölzusammensetzung beziehen, und ein oder mehrere Additive ausgewählt aus: Metall enthaltenden oder aschebildenden Detergentien, aschefreien Dispergiermitteln, borierten aschefreien Dispergiermitteln, Dikohlenwasserstoffdithiophosphatmetallsalzen als Antiverschleißmittel und Antioxidantien, Oxidationsinhibitoren und Antioxidantien, Rost- oder Korrosionsschutzmitteln, Schaumkontrollmitteln, Viskositätsstabilisierenden Mitteln, viskositätsmodifizierenden Mitteln, Stockpunktsenkern, ergänzenden Antiverschleißmitteln umfasst.
  2. Verwendung nach Anspruch 1, wobei die Schmierölzusammensetzung weniger als 0,05 Masse-% Reibungsmodifizierungsmittel, geeigneterweise weniger als 0,04 Masse-%, vorzugsweise weniger als 0,01 Masse-% (z. B. nicht mehr als 0,0075 Masse-%) umfasst, bezogen auf die Masse an vollständig formulierter Schmierölzusammensetzung.
  3. Verwendung nach Anspruch 1 oder Anspruch 2, wobei das Reibungsmodifizierungsmittel ausgewählt ist aus einem oder mehreren der folgenden: Glycerinester von Fettsäuren wie Glycerinoleat, Stickstoff enthaltende Reibungsmodifizierungsmittel wie Ölsäureamid und Molybdänverbindungen.
  4. Verwendung nach einem der Ansprüche 1 bis 3, wobei die Sulfatasche der Schmierölzusammensetzung weniger als 0,7 Masse-% beträgt.
  5. Verwendung nach einem der Ansprüche 1 bis 4, wobei der Phosphorgehalt der Schmierölzusammensetzung 0,06 Masse-% oder weniger beträgt, bezogen auf die Masse der vollständig formulierten Zusammensetzung.
  6. Verwendung nach einem der Ansprüche 1 bis 5, wobei der Borgehalt der Zusammensetzung weniger als 90 Masse-ppm beträgt, vorzugsweise weniger als 80 ppm, z. B. weniger als 70 ppm.
  7. Verwendung nach einem der Ansprüche 1 bis 6, wobei die Schmierölzusammensetzung ein oder mehrere Stickstoff enthaltende Dispergiermittel umfasst, wobei das bzw. die Dispergiermittel ggfs. von 0,005 bis 0,8 Masse-% Stickstoff für die Zusammensetzung liefern.
  8. Verwendung nach einem der Ansprüche 1 bis 7, so dass der Volkswagen RNT Test über 650 Stunden (Entwurf PV1473) für Verschleiß von Nockenwellen und Ventilstößeln bestanden wird.
  9. Verwendung nach Anspruch 8, so dass sowohl der VW RNT Test über 650 Stunden (Entwurf PV1473) für Verschleiß von Nockenwellen und Ventilstößeln als auch der Test VW PV1451 zum Treibstoffverbrauch bestanden wird.
EP06112913A 2005-05-20 2006-04-21 Verwendung von Schmierölzusammensetzungen zur Verschleissreduzierung von mit drehendem Zapfer versehenen Personenkraftwagenmotoren Not-in-force EP1724330B1 (de)

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EP06112913A EP1724330B1 (de) 2005-05-20 2006-04-21 Verwendung von Schmierölzusammensetzungen zur Verschleissreduzierung von mit drehendem Zapfer versehenen Personenkraftwagenmotoren

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US8003584B2 (en) 2006-07-14 2011-08-23 Afton Chemical Corporation Lubricant compositions
US7902133B2 (en) 2006-07-14 2011-03-08 Afton Chemical Corporation Lubricant composition
US7906465B2 (en) 2006-07-14 2011-03-15 Afton Chemical Corp. Lubricant compositions
US7879775B2 (en) 2006-07-14 2011-02-01 Afton Chemical Corporation Lubricant compositions
US20080015127A1 (en) * 2006-07-14 2008-01-17 Loper John T Boundary friction reducing lubricating composition
KR20160044306A (ko) 2014-10-15 2016-04-25 현대자동차주식회사 연비 및 내구향상형 디젤엔진오일 조성물

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Publication number Priority date Publication date Assignee Title
US4164473A (en) 1977-10-20 1979-08-14 Exxon Research & Engineering Co. Organo molybdenum friction reducing antiwear additives
CA1133490A (en) 1978-09-18 1982-10-12 Jack Ryer Molybdenum complexes of ashless oxazoline dispersants as friction reducing antiwear additives for lubricating oils
FR2484442B1 (fr) 1980-02-01 1985-11-22 Lubrizol Corp Procede de preparation de compositions contenant du molybdene utiles pour une meilleure economie du combustible des moteurs a combustion interne
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US4479883A (en) 1982-01-06 1984-10-30 Exxon Research & Engineering Co. Lubricant composition with improved friction reducing properties containing a mixture of dithiocarbamates
US6569818B2 (en) * 2000-06-02 2003-05-27 Chevron Oronite Company, Llc Lubricating oil composition
US7026273B2 (en) * 2001-11-09 2006-04-11 Infineum International Limited Lubricating oil compositions
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JP2004083746A (ja) * 2002-08-27 2004-03-18 Nippon Oil Corp 内燃機関用潤滑油組成物

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