WO2011043331A1 - グリース組成物及び等速ジョイント - Google Patents
グリース組成物及び等速ジョイント Download PDFInfo
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- WO2011043331A1 WO2011043331A1 PCT/JP2010/067442 JP2010067442W WO2011043331A1 WO 2011043331 A1 WO2011043331 A1 WO 2011043331A1 JP 2010067442 W JP2010067442 W JP 2010067442W WO 2011043331 A1 WO2011043331 A1 WO 2011043331A1
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- WIPO (PCT)
- Prior art keywords
- joint member
- constant velocity
- grease composition
- outer joint
- velocity joint
- Prior art date
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Classifications
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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
- C10M141/00—Lubricating compositions characterised by the additive being a mixture of two or more compounds covered by more than one of the main groups C10M125/00 - C10M139/00, each of these compounds being essential
- C10M141/08—Lubricating compositions characterised by the additive being a mixture of two or more compounds covered by more than one of the main groups C10M125/00 - C10M139/00, each of these compounds being essential at least one of them being an organic sulfur-, selenium- or tellurium-containing compound
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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
- C10M169/00—Lubricating compositions characterised by containing as components a mixture of at least two types of ingredient selected from base-materials, thickeners or additives, covered by the preceding groups, each of these compounds being essential
- C10M169/06—Mixtures of thickeners and additives
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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
- C10M2203/00—Organic non-macromolecular hydrocarbon compounds and hydrocarbon fractions as ingredients in lubricant compositions
- C10M2203/10—Petroleum or coal fractions, e.g. tars, solvents, bitumen
- C10M2203/1006—Petroleum or coal fractions, e.g. tars, solvents, bitumen used as base material
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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
- C10M2207/00—Organic non-macromolecular hydrocarbon compounds containing hydrogen, carbon and oxygen as ingredients in lubricant compositions
- C10M2207/10—Carboxylix acids; Neutral salts thereof
- C10M2207/106—Carboxylix acids; Neutral salts thereof used as thickening agents
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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
- C10M2207/00—Organic non-macromolecular hydrocarbon compounds containing hydrogen, carbon and oxygen as ingredients in lubricant compositions
- C10M2207/10—Carboxylix acids; Neutral salts thereof
- C10M2207/12—Carboxylix acids; Neutral salts thereof having carboxyl groups bound to acyclic or cycloaliphatic carbon atoms
- C10M2207/125—Carboxylix acids; Neutral salts thereof having carboxyl groups bound to acyclic or cycloaliphatic carbon atoms having hydrocarbon chains of eight up to twenty-nine carbon atoms, i.e. fatty acids
- C10M2207/126—Carboxylix acids; Neutral salts thereof having carboxyl groups bound to acyclic or cycloaliphatic carbon atoms having hydrocarbon chains of eight up to twenty-nine carbon atoms, i.e. fatty acids monocarboxylic
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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
- C10M2207/00—Organic non-macromolecular hydrocarbon compounds containing hydrogen, carbon and oxygen as ingredients in lubricant compositions
- C10M2207/10—Carboxylix acids; Neutral salts thereof
- C10M2207/12—Carboxylix acids; Neutral salts thereof having carboxyl groups bound to acyclic or cycloaliphatic carbon atoms
- C10M2207/125—Carboxylix acids; Neutral salts thereof having carboxyl groups bound to acyclic or cycloaliphatic carbon atoms having hydrocarbon chains of eight up to twenty-nine carbon atoms, i.e. fatty acids
- C10M2207/128—Carboxylix acids; Neutral salts thereof having carboxyl groups bound to acyclic or cycloaliphatic carbon atoms having hydrocarbon chains of eight up to twenty-nine carbon atoms, i.e. fatty acids containing hydroxy groups; Ethers thereof
- C10M2207/1285—Carboxylix acids; Neutral salts thereof having carboxyl groups bound to acyclic or cycloaliphatic carbon atoms having hydrocarbon chains of eight up to twenty-nine carbon atoms, i.e. fatty acids containing hydroxy groups; Ethers thereof used as thickening agents
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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
- C10M2215/00—Organic non-macromolecular compounds containing nitrogen as ingredients in lubricant compositions
- C10M2215/10—Amides of carbonic or haloformic acids
- C10M2215/102—Ureas; Semicarbazides; Allophanates
- C10M2215/1026—Ureas; Semicarbazides; Allophanates used as thickening material
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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
- C10M2219/00—Organic non-macromolecular compounds containing sulfur, selenium or tellurium as ingredients in lubricant compositions
- C10M2219/06—Thio-acids; Thiocyanates; Derivatives thereof
- C10M2219/062—Thio-acids; Thiocyanates; Derivatives thereof having carbon-to-sulfur double bonds
- C10M2219/066—Thiocarbamic type compounds
- C10M2219/068—Thiocarbamate metal salts
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- 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
- C10N2010/00—Metal present as such or in compounds
- C10N2010/04—Groups 2 or 12
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- 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
- C10N2010/00—Metal present as such or in compounds
- C10N2010/12—Groups 6 or 16
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- 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
- C10N2020/00—Specified physical or chemical properties or characteristics, i.e. function, of component of lubricating compositions
- C10N2020/01—Physico-chemical properties
- C10N2020/02—Viscosity; Viscosity index
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- 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
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- 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
- C10N2040/04—Oil-bath; Gear-boxes; Automatic transmissions; Traction drives
- C10N2040/046—Oil-bath; Gear-boxes; Automatic transmissions; Traction drives for traction drives
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- 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
- C10N2050/00—Form in which the lubricant is applied to the material being lubricated
- C10N2050/10—Semi-solids; greasy
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
- F16D2300/00—Special features for couplings or clutches
- F16D2300/06—Lubrication details not provided for in group F16D13/74
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T403/00—Joints and connections
- Y10T403/32—Articulated members
- Y10T403/32606—Pivoted
- Y10T403/32631—Universal ball and socket
Definitions
- the present invention relates to a grease composition having excellent wear resistance and a constant velocity joint in which the grease composition is enclosed.
- the constant velocity joint of an automobile has a relative motion in which rolling and sliding between components are combined inside, and energy loss, vibration, abnormal noise, and heat generation may occur. In order to reduce or prevent them, it is desirable to use grease with excellent wear resistance.
- lubricating greases used for such applications include greases using calcium soap as a thickener and lithium soaps as a thickener, such as sulfurized fats and oils, tricresyl phosphate, and zinc dithiophosphate.
- a grease containing a sulfur-phosphorus extreme pressure agent selected from the group described above has been used (for example, Non-Patent Document 1).
- a grease containing a specific urea compound as a thickener, molybdenum disulfide, molybdenum dialkyldithiocarbamate, and a specific sulfur-based extreme pressure agent has been used (for example, Patent Document 1).
- an object of the present invention is to provide a grease composition which is excellent in wear resistance and is suitable for a constant velocity joint, and a constant velocity joint in which the grease composition is sealed, in particular, a barfield type constant velocity joint (BJ), a double offset type constant velocity joint. (DOJ), providing a tripod constant velocity joint (TJ).
- BJ barfield type constant velocity joint
- DOJ double offset type constant velocity joint
- TJ tripod constant velocity joint
- a grease composition comprising the following components: (A) base oil, (B) a lithium soap thickener; (C) at least one metal stearate selected from the group consisting of Ca stearate, Mg stearate, and Zn stearate, (D) molybdenum sulfide dialkyldithiocarbamate, and (e) zinc sulfide dialkyldithiocarbamate. 2. 3. The grease composition according to 1 or 2 above, wherein the amount of component (c) added is 0.1 to 5% by mass. 3. 4.
- An outer joint member in which a plurality of track grooves are formed on a spherical inner peripheral surface, and a plurality of track grooves which are paired with the track grooves of the outer joint member on a spherical outer peripheral surface disposed inside the outer joint member
- a ball interposed between the track groove of the outer joint member and the track groove of the inner joint member as a rolling element, and the ball between the outer joint member and the inner joint member.
- a constant velocity joint (Burfield type constant velocity joint (BJ)) according to the above 5, characterized in that a cage for holding is interposed. 7).
- An outer joint member in which a plurality of linear track grooves extending in the axial direction are formed on a cylindrical inner peripheral surface, and a spherical outer peripheral surface disposed inside the outer joint member is paired with the track groove of the outer joint member. And a ball interposed between the track groove of the outer joint member and the track groove of the inner joint member as a rolling element, and the outer joint member 6.
- the constant velocity joint double offset constant velocity joint (DOJ)) according to 5 above, wherein a cage for holding the ball is interposed between the inner joint member and the inner joint member. 8).
- An outer joint member formed with three linear track grooves extending in the axial direction on the inner peripheral surface, and an inner joint member comprising a tripod member having three leg shafts projecting in the radial direction, the leg shaft
- the roller according to claim 5 further comprising a roller that is rotatably supported by the outer joint member and that is rotatably inserted into the track groove of the outer joint member and guided along the track groove.
- Speed joint tripod type constant velocity joint (TJ)).
- the present invention has excellent wear resistance, can efficiently lubricate machine parts, effectively reduce wear, and prevent energy loss and vibration.
- the grease of the present invention is suitable for a constant velocity joint, and particularly suitable for a Barfield type constant velocity joint (BJ), a double offset type constant velocity joint (DOJ), and a tripod type constant velocity joint (TJ).
- the present inventors have conducted various researches and developments on grease compositions exhibiting excellent wear resistance characteristics for constant velocity joints, and evaluated the performance of grease under various lubrication conditions. Using SRV (Schwinging Libundund Verschleiss) tester capable of measuring wear scar condition), high-speed four-ball load-bearing performance test that shows the load-bearing characteristics of grease under sliding conditions, and actual machine durability test using constant velocity joints The lubrication characteristics of various additives were investigated.
- SRV Korean Libundundund Verschleiss
- the inventors have (a) a base oil, (b) a lithium soap thickener, (c) a stearate of Ca, Mg, Zn, (d) a molybdenum dialkyldithiocarbamate sulfide, (e) It has been found that by using zinc sulfide dialkyldithiocarbamate, desirable lubricating properties are exhibited.
- Examples of the (a) base oil used in the present invention include commonly used lubricating oils such as mineral oils, ether-based synthetic oils, hydrocarbon-based synthetic oils, or mixed oils thereof, but are not limited thereto. Is not to be done.
- the lithium soap thickener as component (b) used in the present invention is prepared from a fatty acid or hydroxy fatty acid having 6 to 24 carbon atoms, preferably 12 to 20 carbon, and an alkaline compound such as lithium hydroxide or lithium carbonate. Examples include soap. Particularly preferred are 12 hydroxy lithium stearate and lithium stearate. These are thickeners that are excellent in heat resistance, have few defects, are not expensive, and have practical utility.
- the amount of the lithium soap used as component (b) may be an appropriate amount to obtain the required consistency, and is usually preferably 2 to 20% by mass, more preferably 5%, based on the entire grease composition. To 15% by mass. If the amount of lithium soap used exceeds 25% by mass, the resulting grease composition will be too hard and the desired effect will be difficult to obtain.
- the consistency of the grease composition for constant velocity joints of the present invention is preferably 300 to 385, more preferably 310 to 340 as the consistency measured according to JIS K 2220 5.3, for example. If it is 300 or less, the grease is hard and it is difficult for the grease to intervene in the lubrication part inside the joint, and wear progresses. If it exceeds 385, the grease is soft and the grease leaks during assembly of the joint, making it difficult to work. Such consistency adjustment can be easily performed by adjusting the amount of the component (b).
- the (c) component Ca, Mg, Zn stearate used in the present invention is a salt obtained from stearic acid and an alkaline compound of Ca, Mg, Zn, such as a hydroxide or carbonate.
- the amount of component (c) used is preferably 0.01 to 10% by mass, more preferably 0.1 to 5% by mass, based on the entire grease composition.
- the component (d) molybdenum sulfide dialkyldithiocarbamate and the component (e) zinc sulfide dialkyldithiocarbamate can be those used as friction modifiers and antioxidants as petroleum product additives, respectively. .
- the component (d) molybdenum sulfide dialkyldithiocarbamate is preferably represented by the following general formula (1).
- the zinc sulfide dialkyldithiocarbamate is preferably represented by the following general formula (2).
- R 4 is a primary or secondary alkyl group having 1 to 24 carbon atoms or an aryl group having 6 to 30 carbon atoms, particularly preferably a primary or secondary alkyl group having 3 to 8 carbon atoms. .
- the amount of component (d) and component (e) to be used is preferably 0.01 to 10% by mass, more preferably 0.1 to 5% by mass, based on the entire grease composition.
- the grease composition of the present invention can contain an antioxidant, a rust inhibitor, a corrosion inhibitor, and the like.
- an antioxidant e.g., a rust inhibitor, a corrosion inhibitor, and the like.
- Each of these components is preferably used in an amount of 0.1 to 10% by mass, more preferably 0.5 to 5% by mass, based on the entire grease composition.
- the grease composition of the present invention is suitable for a constant velocity joint, and particularly suitable for a barfield type constant velocity joint (BJ), a double offset type constant velocity joint (DOJ), and a tripod type constant velocity joint (TJ).
- BJ barfield type constant velocity joint
- DOJ double offset type constant velocity joint
- TJ tripod type constant velocity joint
- the Barfield type constant velocity joint includes an outer joint member in which a plurality of track grooves are formed on a spherical inner peripheral surface, and a track groove of the outer joint member on a spherical outer peripheral surface disposed inside the outer joint member.
- An inner joint member formed with a plurality of track grooves that form a pair with the outer joint member, and a ball interposed between the track groove of the outer joint member and the track groove of the inner joint member as a rolling element, It has a structural feature in which a cage for holding a ball is interposed between the inner joint member and the inner joint member.
- the balls as the rolling elements are preferably composed of 3 to 8 balls.
- the undercut-free type constant velocity joint is included in the same classification as the Barfield type constant velocity joint.
- the double offset type constant velocity joint includes an outer joint member formed with a plurality of linear track grooves extending in the axial direction on a cylindrical inner peripheral surface, and a spherical outer peripheral surface disposed on the inner side of the outer joint member.
- An inner joint member formed with a plurality of linear track grooves paired with the track grooves of the outer joint member; and a ball interposed between the track grooves of the outer joint member and the track grooves of the inner joint member is rolled. It is provided as a moving body and has a structural feature in which a cage for holding the ball is interposed between the outer joint member and the inner joint member.
- the balls as the rolling elements are preferably composed of 3 to 8 balls.
- the tripod type constant velocity joint is an inner joint composed of an outer joint member having three linear track grooves extending in the axial direction on the inner peripheral surface and a tripod member having three leg shafts projecting in the radial direction.
- a structural feature that includes a roller as a rolling element that is rotatably supported by the leg shaft and that is rotatably inserted into the track groove of the outer joint member and guided along the track groove.
- the ball wear scar diameter in the SRV test is all small, and no surface roughness is observed on the surface of the ball wear scar.
- the fusion load in the 4-ball load-bearing performance test was 2451 N, and no defect was found within the reference time in the durability test.
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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)
Abstract
Description
近年、更なる摩耗特性の向上が望まれ、特定のウレア化合物を増ちょう剤とし、二硫化モリブデン、ジアルキルジチオカルバミン酸モリブデン、特定の硫黄系極圧剤を含有したグリースが使用されていた(例えば、特許文献1)。
また、近年では、優れた耐摩耗特性によりフレーキングの発生を防止する要求は更に厳しくなってきており、特定のウレア化合物を増ちょう剤とし、二硫化モリブデン、ジアルキルジチオカルバミン酸モリブデン、メラミンシアヌレート、カルシウムスルホネート、特定の硫黄系極圧剤を含有したグリースが使用されていた(例えば、特許文献2)。しかし、これらのグリース組成物は、耐摩耗性が十分ではない。さらに、近年のモリブデンの高騰から、二硫化モリブデンを使用しているグリースは高価になり汎用性に欠けるという問題がある。
1.下記の成分を含むグリース組成物。
(a)基油、
(b)リチウム石けん系増ちょう剤、
(c)ステアリン酸Ca塩、ステアリン酸Mg塩、及びステアリン酸Zn塩からなる群から選ばれる少なくとも1種のステアリン酸金属塩、
(d)硫化ジアルキルジチオカルバミン酸モリブデン、及び
(e)硫化ジアルキルジチオカルバミン酸亜鉛。
2.成分(c)の添加量が0.1~5質量%である上記1又は2記載のグリース組成物。
3.成分(d)の添加量が0.1~5質量%、成分(e)の添加量が0.1~5質量%である上記2又は3記載のグリース組成物。
4.等速ジョイント用である上記1~4のいずれか1項記載のグリース組成物。
5.上記1~5のいずれか1項記載グリース組成物を封入した等速ジョイント。
6.球面状の内周面に複数のトラック溝を形成した外側継手部材と、その外側継手部材の内側に配された球面状の外周面に前記外側継手部材のトラック溝と対をなす複数のトラック溝を形成した内側継手部材を備え、前記外側継手部材のトラック溝と前記内側継手部材のトラック溝との間に介在させたボールを転動体として備え、外側継手部材と内側継手部材との間にボールを保持するケージを介在させたことを特徴とする上記5に記載の等速ジョイント(バーフィールド型等速ジョイント(BJ))。
7.円筒状の内周面に軸方向に延びる複数の直線状トラック溝を形成した外側継手部材と、その外側継手部材の内側に配された球面状の外周面に前記外側継手部材のトラック溝と対をなす複数の直線状トラック溝を形成した内側継手部材を備え、前記外側継手部材のトラック溝と前記内側継手部材のトラック溝との間に介在させたボールを転動体として備え、前記外側継手部材と前記内側継手部材との間に前記ボールを保持するケージを介在させたことを特徴とする上記5に記載の等速ジョイント(ダブルオフセット型等速ジョイント(DOJ))。
8.内周面に軸方向に延びる三本の直線状トラック溝を形成した外側継手部材と、径方向に突設された三本の脚軸を有するトリポード部材からなる内側継手部材を備え、前記脚軸に回転自在に支持されると共に前記外側継手部材のトラック溝に転動自在に挿入されて前記トラック溝に沿って案内されるローラを転動体として備えたことを特徴とする上記5に記載の等速ジョイント(トリポード型等速ジョイント(TJ))。
本発明のグリースは、等速ジョイント用として好適であり、特にバーフィールド型等速ジョイント(BJ)、ダブルオフセット型等速ジョイント(DOJ)、トリポード型等速ジョイント(TJ)用として好適である。
その結果、本発明者等は、(a)基油、(b)リチウム石けん系増ちょう剤、(c)Ca、Mg、Znのステアリン酸塩、(d)硫化ジアルキルジチオカルバミン酸モリブデン、(e)硫化ジアルキルジチオカルバミン酸亜鉛を使用する事により、望ましい潤滑特性を示すことを見いだした。
本発明に使用する(b)成分のリチウム石けん系増ちょう剤としては、炭素数6~24、好ましくは12~20の脂肪酸又はヒドロキシ脂肪酸と水酸化リチウム、炭酸リチウムなどのアルカリ性化合物とから調製された石けんが挙げられる。
特に好ましいものは、12ヒドロキシステアリン酸リチウム塩、ステアリン酸リチウム塩である。これらは、耐熱性に優れ、欠点が少なく、かつ高価でなく、実用性がある増ちょう剤である。
本発明の等速ジョイント用グリース組成物のちょう度は、例えば、JIS K 2220 5.3により測定されるちょう度として300~385であるのが好ましく、より好ましくは310~340である。300以下ではグリースは硬く十分にジョイント内部の潤滑部にグリースが介在し難くなり摩耗が進行する。385を超えるとグリースは軟らかく、ジョイントの組み立て時にグリースが漏洩し作業が容易でない。このようなちょう度の調整は、上記(b)成分の量を調整することにより容易に行なう事ができる。
(c)成分の使用量は、グリース組成物全体に対して、好ましくは0.01~10質量%、さらに好ましくは0.1~5質量%である。
(d)成分の硫化ジアルキルジチオカルバミン酸モリブデン及び、(e)成分の硫化ジアルキルジチオカルバミン酸亜鉛は、石油製品添加剤として、それぞれ、摩擦調整剤、酸化防止剤として使用されているものを用いる事ができる。
[R3 2N-CS-S]2-Mo2OmSn (1)
(式中、R3は一級または二級の炭素数1~24、好ましくは炭素数3~18のアルキル基であり、mは0~3、nは1~4であり、m+n=4である。)
(e)硫化ジアルキルジチオカルバミン酸亜鉛は下記一般式(2)で表されるものが好ましい。
[R4 2N-CS-S]2-Zn (2)
(式中、R4は一級または二級の炭素数1~24のアルキル基または炭素数6~30のアリール基である。特に好ましくは炭素数3~8の一級または二級のアルキル基である。) (d)成分および(e)成分の使用量は、グリース組成物全体に対して、それぞれ、好ましくは0.01~10質量%、さらに好ましくは0.1~5質量%である。
これらの成分の使用量はそれぞれ、グリース組成物全体に対して、それぞれ好ましくは0.1~10質量%、さらに好ましくは0.5~5質量%である。
バーフィールド型等速ジョイントは、球面状の内周面に複数のトラック溝を形成した外側継手部材と、その外側継手部材の内側に配された球面状の外周面に前記外側継手部材のトラック溝と対をなす複数のトラック溝を形成した内側継手部材を備え、前記外側継手部材のトラック溝と前記内側継手部材のトラック溝との間に介在させたボールを転動体として備え、外側継手部材と内側継手部材との間にボールを保持するケージを介在させた構造的特徴を持つ。転動体としてのボールは3個~8個で構成されることが望ましい。なお、この明細書において、アンダーカットフリー型等速ジョイントは、バーフィールド型等速ジョイントと同分類に含めるものとする。
〔実施例1~3、比較例1~5〕
増ちょう剤および基油を含むベースグリースに、表1または表2に示す割合になるように、各成分を加え、適宜基油を加えながら、三段ロールミルにて、ちょう度No.1グレード(JIS K 2220 5.3で測定されるちょう度が310~340の範囲内)に調整した。
リチウム石けん系増ちょう剤としては、12ヒドロキシステアリン酸リチウム塩を、ウレア系増ちょう剤としては、シクロヘキシルアミン(1.4モル)およびアニリン(0.6モル)と4,4’-ジフェニルメタンジイソシアネート(1モル)の反応物を使用した。使用量はいずれもグリース組成物全体に対してリチウム石けん系増ちょう剤は10質量%、ウレア系増ちょう剤は15質量%とした。
粘度 40℃ 100 mm2/s
100℃ 10.5 mm2/s
粘度指数 97
<SRV試験>
下記実施例1~3及び比較例1~5の各グリース組成物について、SRV摩擦摩耗試験によりボールの摩耗痕の大きさ、摩耗痕の状態を調査し、耐摩耗性を評価した。
試験条件
テストピース ボール : 直径10mm(SUJ-2)
プレート : 直径24mm×7.85mm(SUJ-2)
評価条件 荷重 :200N
周波数 :50Hz
振幅 :1mm
温度 :80℃
時間 :2時間
測定項目 ボールの摩耗痕径および摩耗痕の状態
摩耗痕の状態の判定基準
○;摩耗痕に面荒れなし
×;摩耗痕に面荒れあり
ASTM D 2596により試験球が融着する荷重である融着荷重(Weld Point)を求めた。この試験で用いた荷重は、784、981、1589、1961、2451Nであった。
高速4球式耐荷重性能試験における融着荷重は2451N以上である事が実用的観点から望ましい。
バーフィールド型等速ジョイント(BJ)、ダブルオフセット型等速ジョイント(DOJ)、トリポード型等速ジョイント(TJ)の等速ジョイントに封入し、これを用いて下記条件にてジョイント耐久試験を実施し、不具合の発生時間を評価した。
測定条件
回転数 : 200rpm
トルク : 1000Nm
角度 : 5°
評価方法と評価基準
ジョイント各部(外側継手部材、内側継手部材又はトラニオン、ケージ、ボール、又はローラー)の(不具合:フレーキングまたは異常摩耗)の発生時間。
○:基準時間で不具合なし
×:基準時間以内に不具合発生
*1)硫化ジアルキルジチオカルバミン酸モリブデン
*2)硫化ジアルキルジチオカルバミン酸亜鉛
*3)バーフィールド型等速ジョイント(BJ)を使用した耐久試験
*4)ダブルオフセット型等速ジョイント(DOJ)を使用した耐久試験
*5)トリポード型等速ジョイント(TJ)を使用した耐久試験
実施例1において(c)ステアリン酸塩を添加していない比較例2では、SRV試験のボール摩耗痕径が大きく、ボール摩耗痕表面には面荒れが観察され、高速4球式耐荷重性能試験における融着荷重が2451N未満であった。耐久試験においても基準時間内で不具合が生じた。
実施例1においてリチウム石けんの代わりにウレア化合物を増ちょう剤として使用した比較例5では、SRV試験のボール摩耗痕径が大きく、ボール摩耗痕表面には面荒れが観察され、高速4球式耐荷重性能試験における融着荷重が2451N未満であった。耐久試験においても基準時間内で不具合が生じた。
Claims (8)
- 下記の成分を含むグリース組成物。
(a)基油、
(b)リチウム石けん系増ちょう剤、
(c)ステアリン酸Ca塩、ステアリン酸Mg塩、及びステアリン酸Zn塩からなる群から選ばれる少なくとも1種のステアリン酸金属塩、
(d)硫化ジアルキルジチオカルバミン酸モリブデン、及び
(e)硫化ジアルキルジチオカルバミン酸亜鉛。 - 成分(c)の添加量が0.1~5質量%である請求項1記載のグリース組成物。
- 成分(d)の添加量が0.1~5質量%、成分(e)の添加量が0.1~5質量%である請求項1又は2記載のグリース組成物。
- 等速ジョイント用である請求項1~3のいずれか1項記載のグリース組成物。
- 請求項1~4のいずれか1項記載のグリース組成物を封入した等速ジョイント。
- 球面状の内周面に複数のトラック溝を形成した外側継手部材と、その外側継手部材の内側に配された球面状の外周面に前記外側継手部材のトラック溝と対をなす複数のトラック溝を形成した内側継手部材を備え、前記外側継手部材のトラック溝と前記内側継手部材のトラック溝との間に介在させたボールを転動体として備え、前記外側継手部材と前記内側継手部材との間に前記ボールを保持するケージを介在させたことを特徴とする請求項5に記載の等速ジョイント。
- 円筒状の内周面に軸方向に延びる複数の直線状トラック溝を形成した外側継手部材と、その外側継手部材の内側に配された球面状の外周面に前記外側継手部材のトラック溝と対をなす複数の直線状トラック溝を形成した内側継手部材を備え、前記外側継手部材のトラック溝と前記内側継手部材のトラック溝との間に介在させたボールを転動体として備え、前記外側継手部材と前記内側継手部材との間に前記ボールを保持するケージを介在させたことを特徴とする請求項5に記載の等速ジョイント。
- 内周面に軸方向に延びる三本の直線状トラック溝を形成した外側継手部材と、径方向に突設された三本の脚軸を有するトリポード部材からなる内側継手部材を備え、前記脚軸に回転自在に支持されると共に前記外側継手部材のトラック溝に転動自在に挿入されて前記トラック溝に沿って案内されるローラを転動体として備えたことを特徴とする請求項5に記載の等速ジョイント。
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JP2014080556A (ja) * | 2012-06-05 | 2014-05-08 | Nsk Ltd | 潤滑剤組成物及及びその製造方法、並びに前記潤滑剤組成物を封入した転がり軸受 |
CN103773581A (zh) * | 2014-02-14 | 2014-05-07 | 苏州惠丰润滑油有限公司 | 一种新型真空密封脂及其制备方法 |
CN108384605B (zh) * | 2018-01-19 | 2021-03-23 | 惠州市阿特斯润滑技术有限公司 | 汽车球节用润滑脂及其制备方法 |
CN111253999A (zh) * | 2020-02-26 | 2020-06-09 | 上海果石实业(集团)有限公司 | 一种半流体有机钼锂基润滑脂及其制备方法和应用 |
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