The Nitrogen Is Bonded Directly To The Carbon Of A -c(=x)x- Group, Wherein The Xs May Be The Same Or Diverse Chalcogens (e.g., Dithiocarbamates, Etc.) Patents (Class 508/363)
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Publication number: 20040138073Abstract: An additive for imparting antiwear properties to a lubricant composition is based on a combination of (1) an organo borate ester composition and (2) one or more sulfur- or phosphorus-containing compounds or a non-sulfur molybdenum compound. The sulfur- or phosphorus-containing compounds are dithiocarbamate, bisdithiocarbamate, 1,3,4-diathiazole, phosphorodithioate, phosphorodithioate esters, and the molybdenum compound is prepared by reacting (a) about 1.0 mole of fatty oil having 12 or more carbon atoms, (b) about 1.0 to 2.5 moles diethanolamine and (c) a molybdenum source.Type: ApplicationFiled: October 2, 2003Publication date: July 15, 2004Applicant: R.T. Vanderbilt Company, Inc.Inventors: Thomas J. Karol, Steven G. Donnelly
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Publication number: 20040132627Abstract: A process for making an additive comprising one or more oil-soluble or oil-dispersible molybdenum-sulfur compounds, said process comprising the steps of:Type: ApplicationFiled: July 1, 2003Publication date: July 8, 2004Inventors: Joby V. John, Ronald P. Wangner, Antonio Gutierrez, Gregory C. Giffin
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Publication number: 20040121919Abstract: This invention relates to a lubricating oil composition comprising a Group I basestock and an antioxidant comprising an oil soluble trinuclear organomolybdenum compound of the generic formula (1): Mo3Sx-(Q) wherein x is from 4 to 10 and Q is a core group, which may be a ligand, wherein the basestock has a kinematic viscosity at 100° C. (KV100) from about 2 cSt to 50 cSt (2×10−6 to 50×10−6 m2/sec), a saturates content of <90% w/w, an aromatics content of >10% w/w and a sulphur content of >0.03% w/w. The composition has an improved stability when compared with either a Group II, III or IV basestock containing the same antioxidant or a Group I basestock containing a dinuclear molybdenum dithiocarbamate.Type: ApplicationFiled: November 1, 2002Publication date: June 24, 2004Inventor: Jason Zhisheng Gao
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Publication number: 20040116309Abstract: An oil composition for cutting and grinding by minimal quantity lubrication system and for sliding surface according to the present invention comprises an ester and a sulfur compound and/or a phosphorus compound.Type: ApplicationFiled: October 3, 2003Publication date: June 17, 2004Inventors: Hideo Yokota, Masanori Ibi, Satoshi Suda
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Publication number: 20040110646Abstract: A long life lubricating oil, as evidenced by a reduction in oil thickening, oxidation and nitration, comprises a major amount of a base oil of lubricating viscosity and a minor amount of a mixture of neutral and overbased metallic detergents and at least one trinuclear molybdenum compound.Type: ApplicationFiled: October 10, 2003Publication date: June 10, 2004Inventor: Stanley James Cartwright
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Patent number: 6734150Abstract: This invention relates to a lubricating oil composition comprising a base stock and an antioxidant comprising an oil soluble trinuclear organomolybdenum compound of the generic formula: Mo3Sx—(Q) (1) wherein x is from 4 to 10 and Q is a core group, which may be a ligand, and at least one other compound selected from a phenolic and an aminic compound wherein the basestock has a kinematic viscosity at 100° C. (KV100) from about 2 cSt to 20 cSt (2×10−6 to 20×10−6 m2/sec) and a saturates content of at least 85%. The composition has a high oxidation stability, reduced deposit formation and is capable of giving rise to good fuel economy improvement.Type: GrantFiled: November 12, 2002Date of Patent: May 11, 2004Assignee: ExxonMobil Research and Engineering CompanyInventors: Jason Zhisheng Gao, Christopher John May, Jeffrey Robert Torkelson, Paul Simon Woolley
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Publication number: 20040087452Abstract: Lubricating oil compositions containing a major amount of oil of lubricating viscosity, an oil soluble molybdenum compound in an amount providing the composition with from 0.001 to 0.1 mass % molybdenum, an oil soluble copper antioxidant in an amount providing the composition with from 0.001 to 0.02 mass % copper to said composition, and an amount of metal hydrocarbyl dithiophosphate providing the composition with from 100 to 550 ppm phosphorus.Type: ApplicationFiled: October 31, 2002Publication date: May 6, 2004Inventors: Joe R. Noles, Wangkan Lin, Rolfe J. Hartley
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Publication number: 20040038834Abstract: This invention relates to a lubricating composition comprising a major amount of an oil of lubricating viscosity, (A) an antiwear improving amount of at least one molybdenum containing composition, (B) at least one phosphorus antiwear or extreme pressure agent, and (C) at least one dispersant, provided that the lubricating composition is free of polysulfurized olefins. The lubricating compositions have improved antiwear properties. When the lubricating composition is used in a manual transmission, the amount of brass wear is reduced.Type: ApplicationFiled: August 21, 2003Publication date: February 26, 2004Inventor: Michael P. Gahagan
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Patent number: 6689725Abstract: This invention relates to a method of controlling the soot induced viscosity increase of a diesel engine lubricant composition comprising a base oil and a dispersant, by including in said lubricant composition an effective amount of an antioxidant, characterised in that the antioxidant comprises a dihydrocarbyldithiocarbamate of a metal selected from antimony, bismuth and mixtures thereof. The antioxidant may optionally contain at least one other compound selected from a phenolic and an aminic compound. The method of the present invention improves the performance retention of the dispersant additive, and thus inhibits the soot-induced viscosity increase of the lubricant.Type: GrantFiled: June 11, 2002Date of Patent: February 10, 2004Assignee: ExxonMobil Research and Engineering CompanyInventor: Jason Zhisheng Gao
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Publication number: 20030224951Abstract: A lubricating oil composition comprising, or made by mixing, a major amount of an oil of lubricating viscosity and a minor amount of at least one compound comprising a polynuclear molybdenum core having bonded thereto one or more monoanionic ligands capable of rendering the compound oil-soluble or oil-dispersible, and further comprising at least one ionic species that is not required to confer oil-solubility or oil-dispersibility to the compound, wherein the combination of said one or more monoanionic ligands and said at least one ionic species confers electrical neutrality to the compound and wherein the ratio of the number of molybdenum atoms in the core to the number of said ligands is greater than 1:1Type: ApplicationFiled: January 27, 2003Publication date: December 4, 2003Inventors: Jonathan M. McConnachie, Ian A. W. Bell, Alisdair J. Brown, Edward I. Stiefel, Ernestine W. Hill
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Publication number: 20030220207Abstract: According to the invention, a self contained vibration resistant bearing is provided. The bearing is coated with a film formed from a rust preventive oil having an extreme-pressure additive content of 0.5 to 10% by weight. Desirably the extreme-pressure additive is an organometallic compound, an organofatty acid compound, organofatty acid derivative, an organophosphoric acid compound or a combination of two(2) or more of such compounds. When a rust preventive film that contains an extreme-pressure additive is formed all over bearing components during the assembling process, the bearing components are fully protected even from sudden vibrations from transportation.Type: ApplicationFiled: May 16, 2003Publication date: November 27, 2003Inventors: Motoharu Akiyama, Noriyuki Yoshimura
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Publication number: 20030211951Abstract: The invention relates to a lubricating composition comprising a base oil of lubricating viscosity, a hydroxy-substituted dithiocarbamate, an organo-molybdenum compound, and optionally a phosphorous source.Type: ApplicationFiled: February 8, 2002Publication date: November 13, 2003Inventor: Vincent J. Gatto
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Patent number: 6627583Abstract: An engine oil composition characterized by containing a major amount of lubricating base oil and (a) 0.01 to 30% by weight of an overbasic oil-soluble metal salt prepared by use of an alkaline-earth metal borate, (b) 0.01 to 5% by weight of a molybdenum dithiocarbamate, and (c) 0.01 to 5% by weight of an antioxidant as essential components, on the basis of the total amount of the composition.Type: GrantFiled: January 30, 2001Date of Patent: September 30, 2003Assignee: Nippon Mitsubishi Oil CorporationInventors: Kiyoshi Inoue, Jinichi Igarashi, Mituaki Ishimaru, Mineo Kagaya, Masakuni Hirata
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Publication number: 20030176297Abstract: A lubricating oil composition having less than 0.2 wt. % sulfur, less than 50 ppm chlorine, less than 50 ppm phosphorus, a NOACK volatility of 15 wt. % or less comprising an organo-molybdenum compound, an overbased calcium or magnesium salicylate, a dispersant and a supplemental antioxidant.Type: ApplicationFiled: February 20, 2002Publication date: September 18, 2003Inventors: Rolfe J. Hartley, Malcolm Waddoups, Ricardo A. Bloch, Roger W. Glyde, Robert Robson
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Publication number: 20030176296Abstract: The present invention concerns a lubricating oil composition comprising an oil of lubricating viscosity; about 0.05 to about 5 weight percent of an organo molybdenum compound; and about 0.1 to about 12 weight percent of a borated polyisobutenyl mono- and bis-succinimide wherein the polyisobutenyl group has a molecular weight (Mn) from about 500 to about 2300.Type: ApplicationFiled: December 12, 2002Publication date: September 18, 2003Inventors: Douglas Edward Deckman, William H. Buck, William L. Maxwell, Mark D. Winemiller, David J. Baillargeon
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Patent number: 6610636Abstract: A premium synthetic lubricant having antiwear properties comprises a synthetic isoparaffinic hydrocarbon base stock and an effective amount of at least one antiwear additive. The antiwear additive is preferably at least one of a metal phosphate, a metal dialkyldithiophosphate, a metal dithiophosphate a metal thiocarbamate, a metal dithiocarbamate, an ethoxylated amine dialkyldithiophosphate and an ethoxylated amine dithiobenzoate. Metal dialkyldithiophosphates are preferred, particularly zincdialkyldithiophosphate (ZDDP). The base stock is derived from a waxy, Fischer-Tropsch synthesized hydrocarbon feed fraction comprising hydrocarbons having an initial boiling point in the range of about 650-750° F., by a process which comprises hydroisomerizing the feed and dewaxing the isomerate. The lubricant may also contain hydrocarbonaceous and synthetic base stock material in admixture with the Fischer-Tropsch derived base stock.Type: GrantFiled: November 9, 2001Date of Patent: August 26, 2003Assignee: ExxonMobil Research and Engineering CompanyInventors: Paul J. Berlowitz, Jacob J. Habeeb, Robert J. Wittenbrink
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Publication number: 20030158052Abstract: To provide a pivot assembly bearing enable maintain it's capabilities longer under frequent quick start and quick stop, the pivot assembly bearing is dispensed a grease composition comprising a base oil, a thickener and an extreme-pressure agent.Type: ApplicationFiled: February 12, 2003Publication date: August 21, 2003Inventor: Motoharu Akiyama
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Publication number: 20030158051Abstract: Disclosed are antioxidant compositions comprising of:Type: ApplicationFiled: September 19, 2002Publication date: August 21, 2003Inventors: Thomas J. Karol, Steven G. Donnelly, Ronald J. Hiza
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Publication number: 20030119682Abstract: An engine lubricant formulated as a complete crankcase motor oil or additive concentrate composed of a combination of chemical constituents including a base oil selected from a synthetic oil, a mineral oil or semi-synthetic base oil (hydrogenated oil) or combination thereof, an oil soluble molybdenum additive, a dispersant inhibitor containing zinc dithiophosphate, and viscosity index improvers and one or more seal swelling agents to lubricate the engine and recondition the seals of new and/or high mileage engines. Addition of a polyalphaolefin and/or one or more esters such as a diester or polyolester may also be utilized therein. The lubricant may be formulated as a complete engine oil crankcase lubricant, or concentrated into an additive for addition to conventional mineral oil based engine oil, synthetic engine oils, or blends thereof in an effective amount of up to 30 percent volume percent, typically from 20 to 25 percent by volume.Type: ApplicationFiled: July 29, 2002Publication date: June 26, 2003Applicant: ASHLAND INC.Inventors: Mandeep S. Saini, Thomas R. Smith, Michael A. Dituro, Richard J. Baumgart, Frances E. Lockwood
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Patent number: 6569820Abstract: Oil-soluble or oil-dispersible trinuclear molybdenum-sulfur compounds are made by reacting, in a polar medium, a reactant molybdenum compound containing an anion that possesses a trinuclear molybdenum core, and a dithiocarbamate that is produced in situ.Type: GrantFiled: March 23, 2001Date of Patent: May 27, 2003Assignee: Infineum International Ltd.Inventors: Jonathan M. McConnachie, Ian A. W. Bell, Edward I. Stiefel, Stanley J. Brois, Ernestine W. Hill, Alisdair J. Brown
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Patent number: 6562765Abstract: An engine oil having a base oil and a friction reducing amount of an oil soluble sulfurized or unsulfurized oxymolybdenum complex prepared from reacting, in the presence of a polar promoter, an acidic molybdenum compound and a basic nitrogen compound and a low concentration of a sulfurized oxymolybdenum dialkyldithiocarbamate; employed together to provide at least 450 parts per million of molybdenum and less than 175 parts per million of molybdenum from the dialkyldithiocarbamate, both on the basis of the engine oil.Type: GrantFiled: July 11, 2002Date of Patent: May 13, 2003Assignee: Chevron Oronite Company LLCInventor: Alexander B. Boffa
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Publication number: 20030073590Abstract: Lubricating oil compositions for residual fuel oil-fuelled diesel engines for marine and stationary applications comprising, or made by admixing:Type: ApplicationFiled: September 10, 2002Publication date: April 17, 2003Inventors: Laurent Chambard, Keith Strickland
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Patent number: 6541427Abstract: The present invention relates to a lubricant for service-free cardan shafts comprising a base selected from the group consisting of a naphthenic solvent and a paraffinic solvent; a thickener selected from the group consisting of lithium salt, lithium soap, and amides of aromatic dicarboxylic acids; at least one flux oil; and an additive selected from the group consisting of molybdenum dithiocarbamate, zinc dithiocarbamate, bismuth dithiocarbamate, molybdenum dithiophosphate, zinc dithiophosphate, and bismuth dithiophosphate, in combination with thiadiazole.Type: GrantFiled: June 22, 1998Date of Patent: April 1, 2003Assignees: FUCHS Europe Schmierstoffe GmbH & Co. KG, Spicer Gelenkwellenbau GmbH & Co. KGInventor: Wilfried Hermann Dresel
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Patent number: 6541429Abstract: A lubricating oil composition is provided comprising a major amount of an oil of lubricating viscosity and a minor amount of, as an additive, at least one compound comprising a polynuclear molybdenum core and bonded thereto one or more anionic ligands capable of rendering the compound oil-soluble or oil-dispersible, wherein the ratio of the number of molybdenum atoms in the core to the number of said ligands is 1:1, such as 3:2 or greater.Type: GrantFiled: March 23, 2001Date of Patent: April 1, 2003Assignee: Infineum International Ltd.Inventors: Jonathan M. McConnachie, Ian A.W. Bell, Alisdair J. Brown, Edward I. Stiefel, Ernestine W. Hill
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Publication number: 20030040442Abstract: The invention aims to provide a rolling bearing that secures a sufficient bearing life economically even when used under such conditions that water from the outside or water formed by moisture condensation may seep into the lubricant or the bearing is affected by the vibrations, and particularly a rolling bearing suited to the electric parts and accessaries of au automobile engine, such as an alternator. To accomplish the object, the hydrogen ion exponent pH of the grease sealed into the inside of the bearing is adjusted in a range of from 7 to 13. For the same purpose, the hydrogen ion exponent pH of the grease is adjusted in a range of from 5 to 13 where a prescribed amount of an organic metal salt or ADTC is added to the grease, where a prescribed amount of an inorganic compound having an average particle size of 2 □m or smaller is added to the grease, or where a diurea compound containing an aromatic amine or a mixture of the diurea compound is added to the grease as a thickener.Type: ApplicationFiled: March 7, 2002Publication date: February 27, 2003Applicant: NSK LTD.Inventors: Atsushi Yokouchi, Youichi Matsumoto, Kenichi Iso, Kouichi Hachiya, Hideki Koizumi, Michiharu Naka
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Publication number: 20030027728Abstract: Grease composition for constant velocity joints, comprising a base oil and a urea-based thickener, which grease additionally contains, (A) molybdenum sulphide dialkyldithiocarbamate and (B) 5,5-dithiobis(1,3,4-thiadiazole-2-thiol); a method of lubricating a constant velocity joint comprising packing it with said grease; and a constant velocity joint packed with said grease.Type: ApplicationFiled: August 27, 2002Publication date: February 6, 2003Inventors: Yasushi Kawamura, Kouichi Nakazawa, Noriaki Shinoda, Keiji Tanaka, Tetsuo Nimura, Kouji Saitou, Tomoyasu Wada
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Publication number: 20020123435Abstract: Lubricants are taught that can quickly and easily form a lubricating layer on a metal surface of a metal before plastic processing. Such lubricants preferably include a primary lubricating agent or component having a bridge complex that satisfies the following conditions: (1) the complex contains at least two central metal atoms; (2) at least one first multidentate ligand forms a bridge between two central metal atoms; and (3) at least one second multidentate ligand is bound to at least one central metal atom and has at least one coordinating atom that can coordinate with metal atoms, but which is not coordinated with any of the central metal atoms or is only partially coordinated with at least one of those central metal atoms. A third multidentate ligand is preferably also bound to one of the central metal atoms and may preferably include at least two sulfur atoms that are coordinated to the central metal atom.Type: ApplicationFiled: November 15, 2001Publication date: September 5, 2002Applicant: MEC International CorporationInventors: Heijiro Ojima, Fumio Kawahara, Mitsuru Tomono
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Patent number: 6444624Abstract: An SAE OW-30 or 5W-30 or 5W-20 lubricant has a Noack volatility of less than 15, optionally an M-111 fuel economy of 1.5% or less, and a chlorine content of less than 100 ppm. The lubricant comprises a basestock containing from 0 to less than 10% Group I and/or Group II basestocks, a molybdenum additive providing not greater than 1000 ppm of molybdenum to the lubricant, a calcium detergent providing 10 or greater mmoles of surfactant per kilogram of lubricant, one or more other additives, and a viscosity modifier.Type: GrantFiled: September 20, 2000Date of Patent: September 3, 2002Inventors: Juliet V. Walker, Ian A. Bell
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Publication number: 20020119895Abstract: This invention relates to a lubricating composition comprising a major amount of an oil of lubricating viscosity and (A) an antiwear improving amount of at least one molybdenum containing composition, and (B) at least one member selected from the group consisting of (i) at least one borated overbased metal salt of an acidic organic compound, provided that (A) and (Bi) are not the same, (ii) a combination of (a) at least one organic polysulfide or at least one ashless dithiocarbamate containing composition and (b) at least one component selected from the group consisting of a metal thiophosphate, a phosphoric acid ester or salt thereof, a phosphorus-containing carboxylic acid, ester, ether, or amide, a borated dispersant, an alkali metal borate, a borated fatty amine, a borated phospholipid, a borate ester, and mixtures thereof, and (iii) a combination of (i) and (ii).Type: ApplicationFiled: May 26, 1995Publication date: August 29, 2002Inventors: SUSAN P. COOK, JAMES J. SCHWIND, BERNARD CONSTANS, HENRI BOURGOGNON
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Publication number: 20020103089Abstract: A lubricant composition for a surface treatment of a steel filament comprises at least one specified compound as a lubricant component and a rubber-steel filament composite body is prepared by using a steel filament treated with the lubricant composition.Type: ApplicationFiled: June 29, 2001Publication date: August 1, 2002Applicant: BRIDGESTONE CORPORATIONInventors: Yasuo Fukushima, Hajime Kondo
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Patent number: 6423671Abstract: Organo molybdenum containing oils of lubricating viscosity having improved high temperature frictional properties are made using semi-packages of additives. The semi-packages contain: (A) a dispersant, a zinc salt, and a detergent and (B) an organo molybdenum compound. The packages are formed individually prior to mixing.Type: GrantFiled: October 6, 1998Date of Patent: July 23, 2002Assignee: The Lubrizol CorporationInventor: Junsuke Haruna
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Publication number: 20020086803Abstract: A premium synthetic lubricant having antiwear properties comprises a synthetic isoparaffinic hydrocarbon base stock and an effective amount of at least one antiwear additive. The antiwear additive is preferably at least one of a metal phosphate, a metal dialkyldithiophosphate, a metal dithiophosphate a metal thiocarbamate, a metal dithiocarbamate, an ethoxylated amine dialkyldithiophosphate and an ethoxylated amine dithiobenzoate. Metal dialkyldithiophosphates are preferred, particularly zincdialkyldithiophosphate (ZDDP). The base stock is derived from a waxy, Fischer-Tropsch synthesized hydrocarbon feed fraction comprising hydrocarbons having an initial boiling point in the range of about 650-750° F., by a process which comprises hydroisomerizing the feed and dewaxing the isomerate. The lubricant may also contain hydrocarbonaceous and synthetic base stock material in admxture with the Fischer-Tropsch derived base stock.Type: ApplicationFiled: November 9, 2001Publication date: July 4, 2002Inventors: Paul J. Berlowitz, Jacob J. Habeeb, Robert J. Wittenbrink
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Patent number: 6379581Abstract: A lubricant for use in a refrigerator which operates with a chlorine-free Flon (fluorocarbon)-type refrigerant whose molecules do not contain chlorine. The lubricant contains a synthetic oil, and molybdenumoxysulfide diorganophosphorodithioate given by the following formula (1) and/or molybdenumoxysulfide diorganodithiocarbamate given by the following formula (2), the content of the compounds of formulae (1) and (2) in total ranges from 0.1 to 10 wt % to the content of the synthetic oil: {(RO)2PS2}2Mo2SXOY (1) where R represents a hydrocarbon group having 3 to 20 carbon atoms, and X and Y are numbers which meet the conditions of O≦X≦4, 0≦Y≦4 and X+Y=4; and (R′2NCS2)2Mo2SX′OY′ (2) where R′ is a hydrocarbon group having 3 to 20 carbon atoms and X′ and Y′ are numbers which meet the conditions of )≦X′≦4, 0≦Y′≦4 and X′+Y′=4.Type: GrantFiled: February 28, 1995Date of Patent: April 30, 2002Assignee: Asahi Denka Kogyo, K.K.Inventors: Tamiji Kamakura, Noriyoshi Tanaka, Kimiyoshi Namiwa, Yukio Tatsumi, Masato Namiki
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Patent number: 6358894Abstract: The invention relates to lubricating oil compositions of a major amount of an oil of lubricating viscosity in admixture with an effective minor amount of an oil soluble or dispersible trinuclear molybdenum containing complex and of an antioxidant, preferably, copper containing antioxidants and diphenyl amines and effective diphenylamine derivatives to enhance the lubricating properties of the oil. Also included are additive concentrates containing these compositions. The invention further includes the method of making these compositions.Type: GrantFiled: November 13, 1997Date of Patent: March 19, 2002Assignee: Infineum USA L.P.Inventors: Daniel Paul Leta, Jonathan M. McConnachie, Edward Ira Stiefel, Charles Frederick Pictroski, Kathleen Marie Creegan
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Publication number: 20020013232Abstract: A grease composition comprising a lubricant base oil and a metal dithiocarbamate represented by the formula (1): 1Type: ApplicationFiled: May 31, 2001Publication date: January 31, 2002Applicant: Nippon Mitsubishi Oil CorporationInventors: Hirotugu Kinoshita, Kiyomi Sakamoto
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Publication number: 20010056042Abstract: A borate ester represented by one of the following formulae:Type: ApplicationFiled: May 7, 2001Publication date: December 27, 2001Inventors: James J. Schwind, S.Q. Abbas Rizvi, Stephen A. DiBiase
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Publication number: 20010056043Abstract: A lubricating oil composition is provided comprising a major amount of an oil of lubricating viscosity and a minor amount of, as an additive, at least one compound comprising a polynuclear molybdenum core and bonded thereto one or more anionic ligands capable of rendering the compound oil-soluble or oil-dispersible, wherein the ratio of the number of molybdenum atoms in the core to the number of said ligands is 1:1, such as 3:2 or greater.Type: ApplicationFiled: March 23, 2001Publication date: December 27, 2001Inventors: Jonathan M. McConnachie, Ian A. W. Bell, Alisdair J. Brown, Edward I. Stiefel, Ernestine W. Hill
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Patent number: 6333297Abstract: A constant-velocity joint for a propeller shaft is provided which can be used with good durability without adding any organic lead compound, which is high in the effect of suppressing temperature rise of grease during high-speed rotation, and which can prevent deterioration of the grease.Type: GrantFiled: December 28, 2000Date of Patent: December 25, 2001Assignee: NTN CorporationInventor: Shinichi Takabe
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Publication number: 20010044390Abstract: A ball screw is provided which makes it easy to determine the degree of deterioration of lubricating grease so that new lubricating grease can be supplied efficiently without loss. The ball screw includes a threaded shaft formed with a thread groove in its outer peripheral surface, a nut formed with a thread groove in its inner peripheral surface, and a plurality of balls rollably retained in a circulating passage comprising a helical passage formed between these thread grooves when the nut is fitted on the threaded shaft, and a passage connecting both end of the helical passage. The balls and the circulating passage are lubricated by a lubricating grease which has a brightness of 1 or over and in which a base oil having a viscosity at 100° C. of 3.0-7.5 mm2/s is thickened by a urea-family thickener.Type: ApplicationFiled: April 20, 2001Publication date: November 22, 2001Inventor: Kimihito Ushida
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Publication number: 20010044387Abstract: An engine oil composition characterized by containing a major amount of lubricating base oil and (a) 0.01 to 30% by weight of an overbasic oil-soluble metal salt prepared by use of an alkaline-earth metal borate, (b) 0.01 to 5% by weight of a molybdenum dithiocarbamate, and (c) 0.01 to 5% by weight of an antioxidant as essential components, on the basis of the total amount of the composition.Type: ApplicationFiled: January 30, 2001Publication date: November 22, 2001Applicant: Nippon Mitsubishi Oil CorporationInventors: Kiyoshi Inoue, Jinichi Igarashi, Mituaki Ishimaru, Mineo Kagaya, Masakuni Hirata
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Patent number: 6300291Abstract: A lubricating oil composition exhibiting improved low temperature anti-wear performance and improved fuel economy and fuel economy retention properties, which comprises: (a) an oil of lubricating viscosity; (b) at least one calcium detergent; (c) at least one oil soluble molybdenum compound; (d) at least one nitrogen containing friction modifier; and (e) at least one zinc dihydrocarbyldithiophosphate compound, wherein the composition has a NOACK volatility of about 15.5 wt. % or less and contains from about 0.058 to 0.58 wt. % calcium from the calcium detergent, molybdenum in an amount up to about 350 ppm from a molybdenum compound, and phosphorus in an amount up to about 0.1 wt. % from a zinc dihydrocarbyldithiophosphate compound.Type: GrantFiled: May 19, 1999Date of Patent: October 9, 2001Assignee: Infineum USA L.P.Inventors: Rolfe J. Hartley, Malcolm Waddoups, Ian A. W. Bell, Thomas R. Bidwell, Gordon R. Farnsworth, Taisuke Miyoshi
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Publication number: 20010027169Abstract: Engine oil compositions comprise (A) a lubricating base oil having a kinematic viscosity at 100° C. of 2 to 6 mm2/S, a viscosity index of 120 or more, and a total aromatics content of 15 percent by mass or less and (B) a polymethacrylate-based viscosity index improver in such an amount that the composition has a kinematic viscosity at 100° C. of 4.0 to 9.3 mm2/s. Disclosed are also engine oil compositions which comprise (A) a lubricating base oil having a kinematic viscosity at 100° C. of 2 to 6 mm2/S, a viscosity index of 120 or more, and a total aromatics content of 15 percent by mass or less; (B) a polymethacrylate-based viscosity index improver in such an amount that the composition has a kinematic viscosity at 100° C. of 4.0 to 9.3 mm2/s; and (C) molybdenumdithiocarbamate.Type: ApplicationFiled: December 18, 2000Publication date: October 4, 2001Applicant: Nippon Mitsubishi Oil CorporationInventors: Isao Kurihara, Jinichi Igarashi, Kiyoshi Inoue
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Patent number: 6281174Abstract: Lubricating compositions are described which contain organomolybdenum compounds and sulfur compounds (donors). The copper corrosion of said compositions is reduced by reacting the sulfur donors with plant oils to reduce sulfur activity and thus copper corrosion prior to the sulfur donors being added to the majority of oil to form a lubricating composition.Type: GrantFiled: February 25, 1998Date of Patent: August 28, 2001Assignee: The Lubrizol CorporationInventor: Junsuke Haruna
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Patent number: 6245725Abstract: There is provided a lubricating composition including a lubricating base containing an asymmetric sulfurized oxymolybdenum dithiocarbamate of the formula (1); a symmetric sulfurized oxymolybdenum dithiocarbamate of the formula (2); and a phenolic or aminic antioxidant. (wherein R1 to R5 are each a hydrocarbon group, provided that R1 to R4 are not concurrently the same group; and X1 to X8 are each a sulfur atom or an oxygen atom.) This lubricating composition meets both the required solubility of additives in base oils and long drain properties concurrently.Type: GrantFiled: December 20, 1999Date of Patent: June 12, 2001Assignee: Asahi Denka Kogyo K.K.Inventors: Noriyoshi Tanaka, Yukio Tatsumi, Yoko Saito, Atsuo Miyashita
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Patent number: 6232276Abstract: A lubricating oil composition is provided comprising a major amount of an oil of lubricating viscosity and a minor amount of at least one trinuclear molybdenum compound. Preferably, the trinuclear molybdenum compound is selected from those compounds having the formula Mo3SkL4Qz and mixtures thereof in which L is a ligand having organo groups with a sufficient number of carbon atoms to render the compound soluble in the oil, k varies from 4 through 7, Q is selected from the group of compounds having lone pair electrons including water, amines, alcohols, phosphines, and ethers, and z ranges from 0 to 5. In general, the organo groups of the mono-anionic ligands will be the same although they may be different, and they preferably are selected from alkyl, aryl, substituted aryl, and ether groups. For example, when L is a dialkyldithiocarbamate or a dialkyldithiophosphate, the alkyl groups will have from about 1 to 30 carbon atoms.Type: GrantFiled: April 18, 1997Date of Patent: May 15, 2001Assignee: Infineum USA L.P.Inventors: Edward Ira Stiefel, Jonathan M. McConnachie, Daniel Paul Leta, Manuel A. Francisco, Catherine Louise Coyle, Peter John Guzi, Charles F. Pictroski
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Patent number: 6211123Abstract: A lubricating oil composition is provided comprising a major amount of an oil of lubricating viscosity and a minor amount of, as an additive, at least one compound comprising a trinuclear tungsten core and bonded thereto a ligand or ligands capable of rendering the compound oil-soluble or oil-dispersible.Type: GrantFiled: June 17, 1999Date of Patent: April 3, 2001Assignee: Infineum USA L.P.Inventors: Alisdair J. Brown, Ian A. W. Bell, John A. Cleverley, Jose M. G. Gomes, Edward I. Stiefel, Jonathan M. McConnachie
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Patent number: 6172013Abstract: Lubricating oil compositions having enhanced friction coefficient and wear properties are provided by compositions of an oil of lubricating viscosity with additives of molybdenum and diesters of aliphatic or aromatic dicarboxylic acids.Type: GrantFiled: September 17, 1997Date of Patent: January 9, 2001Assignee: Exxon Chemical Patents IncInventors: David G. L. Holt, Daniel P. Leta
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Patent number: 6165949Abstract: A premium synthetic lubricant having antiwear properties comprises a synthetic isoparaffinic hydrocarbon base stock and an effective amount of at least one antiwear additive. The antiwear additive is preferably at least one of a metal phosphate, a metal dialkyldithiophosphate, a metal dithiophosphate a metal thiocarbamate, a metal dithiocarbamate, an ethoxylated amine dialkyldithiophosphate and an ethoxylated amine dithiobenzoate. Metal dialkyldithiophosphates are preferred, particularly zincdialkyldithiophosphate (ZDDP). The base stock is derived from a waxy, Fischer-Tropsch synthesized hydrocarbon feed fraction comprising hydrocarbons having an initial boiling point in the range of about 650-750.degree. F., by a process which comprises hydroisomerizing the feed and dewaxing the isomerate. The lubricant may also contain hydrocarbonaceous and synthetic base stock material in admxture with the Fischer-Tropsch derived base stock.Type: GrantFiled: September 4, 1998Date of Patent: December 26, 2000Assignee: Exxon Research and Engineering CompanyInventors: Paul J. Berlowitz, Jacob J. Habeeb, Robert J. Wittenbrink
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Patent number: 6153564Abstract: A lubricating oil composition is provided comprising a major amount of an oil of lubricating viscosity and a minor amount of, as an additive, at least one compound comprising a metal core and bonded thereto one or more ligands capable of rendering the compound oil-soluble or oil-dispersible, at least one ligand having at least two hydrocarbyl groups of which one has 1 to 7 carbon atoms and the other or another has more carbon atoms.Type: GrantFiled: June 17, 1999Date of Patent: November 28, 2000Assignee: Infineum USA L.P.Inventors: Velautha-Cumaran Arunasalam, Ian A. W. Bell, John A. Cleverley, Ronald P. Wangner
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Patent number: 6143701Abstract: A lubricating oil composition which exhibits improved fuel economy and fuel economy retention which contains the combination of an overbased oil soluble calcium detergent additive and an oil soluble trinuclear friction modifying molybdenum compound, the two components functioning to provide an improvement in the friction reducing properties of the composition.Type: GrantFiled: March 13, 1998Date of Patent: November 7, 2000Assignee: Exxon Chemical Patents Inc.Inventor: Alexander B. Boffa