EP0435745B1 - Grease for constant velocity joint - Google Patents
Grease for constant velocity joint Download PDFInfo
- Publication number
- EP0435745B1 EP0435745B1 EP90403671A EP90403671A EP0435745B1 EP 0435745 B1 EP0435745 B1 EP 0435745B1 EP 90403671 A EP90403671 A EP 90403671A EP 90403671 A EP90403671 A EP 90403671A EP 0435745 B1 EP0435745 B1 EP 0435745B1
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- EP
- European Patent Office
- Prior art keywords
- weight
- molybdenum
- grease composition
- compound
- grease
- Prior art date
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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
- C10N2040/32—Wires, ropes or cables lubricants
-
- 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
- C10N2040/34—Lubricating-sealants
-
- 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
- C10N2040/36—Release agents or mold release agents
-
- 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
- C10N2040/38—Conveyors or chain belts
-
- 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
- C10N2040/40—Generators or electric motors in oil or gas winning field
-
- 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
- C10N2040/42—Flashing oils or marking oils
-
- 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
- C10N2040/44—Super vacuum or supercritical use
-
- 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
- C10N2040/50—Medical uses
Definitions
- the present invention relates to greases for constant velocity joints, especially plunging type constant velocity joints.
- plunging type constant velocity joints include double offset type constant velocity joints (DOJ type) and tripod type constant velocity joints (TJ type).
- lubricants are filled therein in order to reduce frictional resistance and to improve slidability.
- Fig. 2 is a graph which shows relations among speed, axial force and sound pressure in the bodies of cars equipped with DOJ.
- the present invention relates to a grease composition for constant velocity joints which comprises base greases comprising mineral oils and urea compounds and (1) 0.5 - 5 % by weight of molybdenum dithiocarbamate compounds and 0.5 - 5 % by weight of molybdenum dithiophosphate compounds as organic molybdenum compounds, (2) 0.5 - 10 % by weight of zinc dithiophosphate compounds as extreme pressure agents, and (3) 10 - 60 % by weight of copolymers having a molecular weight of 300 - 4,000 and comprising ethylene and branched ⁇ -olefin.
- the grease of the present invention may further contain antioxidants, oiliness agents, rust preventives and the like.
- the base oils used in the present invention are mineral oil or synthetic hydrocarbon lubricating oils.
- thickening agents there may be used urea compounds (diurea compounds) which are superior in heat resistance to metallic soaps such as lithium soap.
- Zinc compounds as an extreme pressure compound used in the present invention are zinc dialkyl dithiophosphate, zinc dialryl dithiophosphate, or mixtures thereof.
- the said zinc dialkyl dithiophosphate and zinc diaryl dithiophostate are represented by the following formula wherein R' represents a primary or secondary alkyl group or aryl group.
- organic zinc compounds as well as the above organic molybdenum compounds are very effective extreme pressure agents. Addition of too much amount of zinc compounds does not bring about further increase in effect but rather decrease, and hence an amount of the zinc compounds is 0.5 - 10 % by weight, preferably 0.5 - 5 % by weight.
- copolymers used in the present invention are oligomers of ethylene and branched ⁇ -olefins and are represented by the formula: wherein R'' represents a C3-C10 alkyl group and x, y and p represent integers of 1-145, 1-95 and 1-60, respectively.
- the above oligomers are synthetic oils of hydrocarbons having a molecular weight of 300 - 4,000 and free from polar groups and are effective for reducing axial force under low pressure.
- Addition of copolymers in a too much amount provides no further increase in effect but rather decrease and hence an addition amount is 0.5 - 60 % by weight, preferably 5 - 30 % by weight, more preferably 10 - 30 % by weight.
- a thorough mixture of a base grease comprising purified mineral oil (same as used in Comparative Example 1) as a base oil (83 % by weight) and a diurea compound (10 % by weight), and an organic molybdenum compound 1 (molybdenum dialkyl(C1-C24) dithiocarbamate (4 % by weight), zinc dialkyl(primary and secondary alkyl) and diaryl dithiophosphate as an extreme pressure agent (2 % by weight) and octyldiphenylamine as an antioxidant (1 % by weight) was processed by a three-roll mill. Properties of the resulting grease composition were measured and the results are shown in Table 1.
- Grease composition was obtained in the same manner as in Comparative Example 2 except that 2 % by weight of the organic molybdenum compound 1 (molybdenum dialkyl(C1-C24 alkyl) dithiocarbamate) and 2 % by weight of a molybdenum compound 2 (molybdenum dialkyl(primary and secondary alkyl) and diaryl dithiophsphate) were used as organic molybdenum compounds. Properties of this composition were measured and the results are shown in Table 1.
- the organic molybdenum compound 1 molybdenum dialkyl(C1-C24 alkyl) dithiocarbamate
- a molybdenum compound 2 molybdenum dialkyl(primary and secondary alkyl) and diaryl dithiophsphate
- Table 1 shows that the greases of the present invention have low friction coefficient and provide very low axial force.
- the greases of the present invention have low friction coefficient, are excellent in reducing axial force, can reduce discomfort for passengers and can provide comfortable driving environment.
Landscapes
- Chemical & Material Sciences (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Chemical Kinetics & Catalysis (AREA)
- General Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Engineering & Computer Science (AREA)
- Lubricants (AREA)
Description
- The present invention relates to greases for constant velocity joints, especially plunging type constant velocity joints.
- Representatives of plunging type constant velocity joints include double offset type constant velocity joints (DOJ type) and tripod type constant velocity joints (TJ type).
- Hitherto, as lubricants there have been used greases to which molybdenum disulfide, extreme pressure agents containing lead, sulfur-phosphorus extreme pressure agents or the like are added. However, cars equipped with double offset type constant velocity joints filled with these greases have the problems that beating noise or booming noise is generated or bodies vibrate at high speed driving. On the other hand, cars equipped with tripod type constant velocity joints have the problem that shudder of bodies occurs at acceleration. Further, plunging type constant velocity joints have far more sliding contact than shudder contact and when rotating torque is delivered with angles, axial force is generated by frictional resistance at sliding parts.
- If a large amount of axial force is generated, vibration of bodies occurs to give discomfort to persons in the cars. Therefore, it is desirable to reduce axial force as much as possible.
- Thus, in the case of plunging type constant velocity joints, lubricants are filled therein in order to reduce frictional resistance and to improve slidability.
- As explained above, according to the conventional techniques, there have been developed no greases of low friction coefficient for inhibition of generation of beating noise or booming noise or occurrence of shudder of bodies at high speed driving or acceleration of speed in cars equipped with constant velocity joints, especially plunging type constant velocity joints.
- According to the present invention, above problems have been solved by providing greases for constant velocity joints by adding diurea compounds, organic molybdenum compounds, extreme pressure agents and specific copolymers to base oils.
- In the accompanying drawings,
- Fig. 1 is a graph which shows relation between kinematic viscosity and molecular weight of copolymers.
- Fig. 2 is a graph which shows relations among speed, axial force and sound pressure in the bodies of cars equipped with DOJ.
- The present invention relates to a grease composition for constant velocity joints which comprises base greases comprising mineral oils and urea compounds and (1) 0.5 - 5 % by weight of molybdenum dithiocarbamate compounds and 0.5 - 5 % by weight of molybdenum dithiophosphate compounds as organic molybdenum compounds, (2) 0.5 - 10 % by weight of zinc dithiophosphate compounds as extreme pressure agents, and (3) 10 - 60 % by weight of copolymers having a molecular weight of 300 - 4,000 and comprising ethylene and branched α-olefin.
- The grease of the present invention may further contain antioxidants, oiliness agents, rust preventives and the like.
- The base oils used in the present invention are mineral oil or synthetic hydrocarbon lubricating oils. As thickening agents, there may be used urea compounds (diurea compounds) which are superior in heat resistance to metallic soaps such as lithium soap.
- Organic molybdenum compounds used in the present invention comprise combination of molybdenum dialkyl dithiocarbamates and molybdenum dialkyl dithiophosphates or molybdenum diaryl dithiophosphates.
-
-
- When amounts of organic molybdenum compounds are too much, the effect does not increase but rather deteriorates. Thus, amounts of them are 0.5 - 5 % by weight, respectively and the total amount is 0.5 - 10 % by weight, preferably 2 - 5 % by weight.
- Zinc compounds as an extreme pressure compound used in the present invention are zinc dialkyl dithiophosphate, zinc dialryl dithiophosphate, or mixtures thereof.
-
- These organic zinc compounds as well as the above organic molybdenum compounds are very effective extreme pressure agents. Addition of too much amount of zinc compounds does not bring about further increase in effect but rather decrease, and hence an amount of the zinc compounds is 0.5 - 10 % by weight, preferably 0.5 - 5 % by weight.
-
- The above oligomers are synthetic oils of hydrocarbons having a molecular weight of 300 - 4,000 and free from polar groups and are effective for reducing axial force under low pressure.
- Relation between viscosity and molecular wheight of copolymers is as shown in Fig. 1.
- Addition of copolymers in a too much amount provides no further increase in effect but rather decrease and hence an addition amount is 0.5 - 60 % by weight, preferably 5 - 30 % by weight, more preferably 10 - 30 % by weight.
- A mixture of 90 % by weight of purified mineral oil (paraffinic base oil, viscosity index: 90; kinematic viscosities: 80.3 cSt at 40 °C and 10 cSt at 100 °C; and pour point: -17.5 °C) as a base grease and 10 % by weight of diurea compound was processed by a three-roll mill to obtain a grease composition. Properties of this composition, namely, consistency, dropping point, friction coefficient and axial force were measured and the results are shown in Table 1.
- A thorough mixture of a base grease comprising purified mineral oil (same as used in Comparative Example 1) as a base oil (83 % by weight) and a diurea compound (10 % by weight), and an organic molybdenum compound ① (molybdenum dialkyl(C₁-C₂₄) dithiocarbamate (4 % by weight), zinc dialkyl(primary and secondary alkyl) and diaryl dithiophosphate as an extreme pressure agent (2 % by weight) and octyldiphenylamine as an antioxidant (1 % by weight) was processed by a three-roll mill. Properties of the resulting grease composition were measured and the results are shown in Table 1.
- Grease composition was obtained in the same manner as in Comparative Example 2 except that 2 % by weight of the organic molybdenum compound ① (molybdenum dialkyl(C₁-C₂₄ alkyl) dithiocarbamate) and 2 % by weight of a molybdenum compound ② (molybdenum dialkyl(primary and secondary alkyl) and diaryl dithiophsphate) were used as organic molybdenum compounds. Properties of this composition were measured and the results are shown in Table 1.
- To a base grease comprising 82 % by weight of purified mineral oil (same as used in Comparative Example 1) as a base oil and 10 % by weight of a diurea compound were added 1 % by weight of a copolymer (molecular weight: 3700) of ethylene and branched α-olefin as oligomers, 2 % by weight of the organic molybdenum compound ① (same as in Comparative Example 2), 2 % by weight of the organic molybdenum compound ② (same as in Comparative Example 3), 2 % by weight of zinc dialkyl dithiophosphate as an extreme pressure agent, and 1 % by weight of octyldiphenylamine as an antioxidant. They were well mixed and then processed by a three-roll mill to obtain a grease composition. Properties of this composition measured are shown in Table 1.
- Grease compositions as shown in Table 1 were obtained in the same manner as in Comparative Example 4 except that amounts of the mineral oils and copolymers (molecular weight: 3700) of ethylene and branched α-olefin as oligomers were changed. Properties of these compositions are shown in Table 1.
- Comparison of the results of Examples 1-4 and Comparative Examples 1-6 shows that when the copolymers of ethylene and branched α-olefins were added in required amount to greases of low friction coefficient, said friction coefficient did not change, but axial force decreased to a larger extent than in the cases where the greases did not contain the copolymers as in the present invention (see Table 1 and Fig. 2). It is considered that this is due to synergistic effect of addition of diurea compounds, organic molybdenum compounds, extreme pressure agents and copolymers.
- Properties of grease compositions were measured by the following methods.
Consistency: JIS K2220 5.3
Dropping point: JIS K2220 5.4
Friction coefficient: ASTM D2266 (50 kgf x 600 rpm x room temperature x 15 minutes) -
- Table 1 shows that the greases of the present invention have low friction coefficient and provide very low axial force.
- As explained above, the greases of the present invention have low friction coefficient, are excellent in reducing axial force, can reduce discomfort for passengers and can provide comfortable driving environment.
Claims (6)
- A grease composition for constant velocity joint which comprises a base grease comprising a mineral oil and an urea compound and the following compounds;(1) 0.5 - 5 % by weight, based on the grease composition, of a molybdenum dithiocarbamate compound and 0.5 - 5 % by weight, based on the grease composition, of a molybdenum dithiophosphate compound as organic molybdenum compounds,(2) 0.5 - 10 % by weight, based on the grease composition, of zinc dithiophosphate compound as an extreme pressure agent, and(3) 10 - 60 % by weight, based on the grease composition, of a copolymer of ethylene and branched α-olefin.
- A grease composition according to claim 1, wherein the molybdenum dithiocarbamate compound is molybdenum dialkyl dithiocarbamates.
- A grease composition according to claim 1, wherein the molybdenum dithiophosphate compound is at least one compound selected from the group consisting of molybdenum dialkyl dithiophosphates and molybdenum diaryl dithiophosphates.
- A grease composition according to claim 1, wherein the zinc dithiophosphate compound as an extreme pressure agent is at least one compound selected from the group consisting of zinc dialkyl dithiophosphates and zinc diaryl dithiophosphates.
- A grease composition according to claim 1, wherein the copolymer of ethylene and branched α-olefin is an oligomer of ethylene and branched α-olefin which is represented by the formula:
- A grease composition according to claim 5, wherein the oligomer has a molecular weight of 300 - 4,000.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP33670289 | 1989-12-27 | ||
JP336702/89 | 1989-12-27 |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0435745A1 EP0435745A1 (en) | 1991-07-03 |
EP0435745B1 true EP0435745B1 (en) | 1993-11-10 |
Family
ID=18301917
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP90403671A Expired - Lifetime EP0435745B1 (en) | 1989-12-27 | 1990-12-19 | Grease for constant velocity joint |
Country Status (2)
Country | Link |
---|---|
EP (1) | EP0435745B1 (en) |
DE (1) | DE69004550T2 (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN1723268B (en) * | 2002-12-10 | 2010-11-24 | 国际壳牌研究有限公司 | Urea grease composition |
Families Citing this family (16)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2915611B2 (en) * | 1991-04-01 | 1999-07-05 | 協同油脂株式会社 | Grease composition for constant velocity joints |
JP2989311B2 (en) * | 1991-04-30 | 1999-12-13 | 協同油脂株式会社 | Grease composition for constant velocity joints |
FR2684108B1 (en) * | 1991-11-27 | 1994-10-28 | Mobil Oil France | NEW GREASE, ESPECIALLY FOR USE IN HOMOCINETIC JOINTS. |
CA2093029C (en) * | 1992-04-14 | 2003-07-29 | Jon C. Root | Lubricants, particularly lubricating grease compositions for constant velocity universal joints |
JP3320569B2 (en) * | 1994-10-21 | 2002-09-03 | 協同油脂株式会社 | Grease composition for constant velocity joints |
GB9505938D0 (en) * | 1995-03-23 | 1995-05-10 | Exxon Research Engineering Co | Extreme pressure additive combination and lubricants containing it |
US5858931A (en) * | 1995-08-09 | 1999-01-12 | Asahi Denka Kogyo K.K | Lubricating composition |
CA2187474C (en) * | 1995-10-12 | 2003-12-02 | Asahi Denka Kogyo Kk | Lubricating composition |
EP1169421B1 (en) * | 1999-03-15 | 2003-01-08 | Shell Internationale Researchmaatschappij B.V. | Grease composition for constant velocity joints |
JP2000303087A (en) * | 1999-04-21 | 2000-10-31 | Showa Shell Sekiyu Kk | Grease composition for constant-velocity joint |
JP4405202B2 (en) * | 2002-12-10 | 2010-01-27 | 昭和シェル石油株式会社 | Urea grease composition |
JP5379343B2 (en) * | 2006-05-10 | 2013-12-25 | 昭和シェル石油株式会社 | Grease composition for constant velocity joints |
US20080039348A1 (en) * | 2006-08-09 | 2008-02-14 | Chevron Oronite Company Llc | Low phosphorus lubricating oil composition having lead corrosion control |
WO2010027019A1 (en) | 2008-09-05 | 2010-03-11 | Ntn株式会社 | Grease composition, and roller bearing and universal joint packed with said grease composition |
FR2949786B1 (en) | 2009-09-10 | 2013-07-05 | Total Raffinage Marketing | GREASE COMPOSITION. |
DE102015103440A1 (en) | 2015-03-09 | 2016-09-15 | Fuchs Petrolub Se | Process for the preparation of polyurea-thickened lubricating greases based on lignin derivatives, greases of this kind and their use |
Family Cites Families (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS6346299A (en) * | 1986-01-16 | 1988-02-27 | Ntn Toyo Bearing Co Ltd | Grease for constant speed joint |
JPS63227697A (en) * | 1987-03-17 | 1988-09-21 | Shin Etsu Chem Co Ltd | Tacky grease composition |
US4764293A (en) * | 1987-08-28 | 1988-08-16 | Witco Corporation | Lubricant compositions |
US4904399A (en) * | 1989-03-31 | 1990-02-27 | Amoco Corporation | Process for preventing grease fires in steel mills and other metal processing mills |
-
1990
- 1990-12-19 DE DE90403671T patent/DE69004550T2/en not_active Expired - Fee Related
- 1990-12-19 EP EP90403671A patent/EP0435745B1/en not_active Expired - Lifetime
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN1723268B (en) * | 2002-12-10 | 2010-11-24 | 国际壳牌研究有限公司 | Urea grease composition |
Also Published As
Publication number | Publication date |
---|---|
DE69004550T2 (en) | 1994-05-11 |
DE69004550D1 (en) | 1993-12-16 |
EP0435745A1 (en) | 1991-07-03 |
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