Power transmission fluids

• US 7,947,636 B2
• Filed: 02/27/2004
• Issued: 05/24/2011
• Est. Priority Date: 02/27/2004
• Status: Active Grant

• Current Assignee: Afton Chemical Corporation
• Original Assignee: Afton Chemical Corporation
• Inventors: Saathoff, Lee D., Yatsunami, Kenji
• Primary Examiner(s): Caldarola; Glenn
• Assistant Examiner(s): GOLOBOY, JAMES C
• Application Number:
  US10/788,732
• Publication Number:
  US 20050192185A1
• Time in Patent Office: 2,643 Days
• Field of Search: 508/545, 508/291
• US Class Current: 508/545
• CPC Class Codes: C10M 141/06 at least one of them being an organic nitrogen-containing compound
• CPC Class Codes: C10M 161/00 Lubricating compositions characterised by the additive being a mixture of a macromolecular compound and a non-macromolecular compound, each of these compounds being essential
• CPC Class Codes: C10M 163/00 Lubricating compositions characterised by the additive being a mixture of a compound of unknown or incompletely defined constitution and a non-macromolecular compound, each of these compounds being essential
• CPC Class Codes: C10M 169/04 Mixtures of base-materials and additives
• CPC Class Codes: C10M 169/045 the additives being a mixture of compounds of unknown or incompletely defined constitution and non-macromolecular compounds
• CPC Class Codes: C10M 2203/1025 used as base material
• CPC Class Codes: C10M 2205/173 used as base material
• CPC Class Codes: C10M 2207/283 of polyhydroxy compounds
• CPC Class Codes: C10M 2207/401 used as base material
• CPC Class Codes: C10M 2215/04 having amino groups bound to acyclic or cycloaliphatic carbon atoms
• CPC Class Codes: C10M 2215/26 Amines
• CPC Class Codes: C10M 2215/28 Amides; Imides
• CPC Class Codes: C10M 2217/043 Mannich bases
• CPC Class Codes: C10M 2217/046 Polyamines, i.e. macromoleculars obtained by condensation of more than eleven amine monomers
• CPC Class Codes: C10N 2030/06 Oiliness; Film-strength; Anti-wear; Resistance to extreme pressure
• CPC Class Codes: C10N 2040/04 Oil-bath; Gear-boxes; Automatic transmissions; Traction drives
• CPC Class Codes: C10N 2040/042 for automatic transmissions
• CPC Class Codes: C10N 2040/045 for continuous variable transmission [CVT]
• CPC Class Codes: C10N 2060/14 by boron or a compound containing boron

Abstract

A power transmission fluid composition having improved characteristics. The fluid may include a base oil and an additive composition, wherein the additive composition includes an ashless dispersant and an oil-soluble aliphatic tertiary amine. The resulting fluid may have improved durability characteristics.

Claims

1. A method of improving the friction durability of a transmission fluid comprising:

preparing a transmission fluid by adding to a base oil, an additive composition comprising;

an ashless dispersant, present in an amount from 3 to 5 wt % based on the transmission fluid and

an oil-soluble aliphatic tertiary amine component, wherein the oil-soluble aliphatic tertiary amine component comprises an oil-soluble aliphatic tertiary amine of the formula

2. The method of claim 1, wherein the fluid has improved durability compared to a transmission not containing the ashless dispersant and the oil-soluble aliphatic tertiary amine.

3. The method of claim 1, wherein the base oil comprises one or more of a natural oil, a mixture of natural oils, a synthetic oil, a mixture of synthetic oils, and a mixture of natural and synthetic oils.

4. The method of claim 3, wherein the natural oil comprises one or more of a mineral oil, a vegetable oil, and a mixture of mineral oil and vegetable oil.

5. The method of claim 3, wherein the synthetic oil comprises one or more of an oligomer of an alphaolefin, an ester, an oil derived from a Fischer-Tropsch process, a gas-to-liquid stock, and a mixture thereof.

6. The method of claim 1, wherein the base oil has a kinematic viscosity of from about 2 centistokes to about 10 centistokes at about 100°

C.

7. The method of claim 1, wherein R2 and R3 independently contain from about 12 to about 30 carbon atoms.

8. The method of claim 1, wherein the oil-soluble aliphatic tertiary amine is present in an amount from about 0.5 to about 4 percent by weight.

9. The method of claim 1, wherein the oil-soluble aliphatic tertiary amine is present in an amount from about 0.5 to about 1.5 percent by weight.

10. The method of claim 1, wherein providing the additive composition comprises providing an additive composition further comprising one or more of an antioxidant, an antiwear agent, a friction modifier, an antifoam agent, and a corrosion inhibitor.

11. The method of claim 1, wherein the ashless dispersant comprises one or more of a hydrocarbyl succinimide, a hydrocarbyl succinamide, a polyol ester, a mixed ester/amide of hydrocarbyl substituted succinic acid, and a Mannich condensation product of hydrocarbyl-substituted phenols, a formaldehyde, and a polyamine.

12. The method of claim 1 further comprising:

subjecting the fluid to oxidative and thermal stressing.

13. The method of claim 1, wherein improving the durability of the transmission fluid includes improving anti-rattle performance of a continuously variable transmission fluid.

14. The method of claim 1, wherein improving the durability of the transmission fluid includes improving dynamic friction in a 6-speed transmission fluid.

15. The method of claim 1, wherein improving the durability of the transmission fluid includes improving anti-shudder durability in continuously slipping torque converter clutch fluid.

16. The method of claim 1, wherein the transmission fluid is suitable for use in a transmission employing one or more of a slipping torque converter, a lock-up torque converter, a starting clutch and one or more shifting clutches.

17. The method of claim 1, wherein the transmission fluid is suitable for use in a belt, chain, or disk-type continuously variable transmission.