Continuously variable transmission fluid with extended anti-shudder durability

Patent metadata

Field	Value
Publication number	US-9567547-B2
Application number	US-201213976670-A
Country	US
Kind code	B2
Filing date	Jan 3, 2012
Priority date	Jan 4, 2011
Publication date	Feb 14, 2017
Grant date	Feb 14, 2017

Abstract

A lubricant composition comprising (a) an oil of lubricating viscosity; (b) at least two nitrogen-containing materials, comprising (i) at least one amide of the formula R 3 C(O)NR 1 R 2 and (ii) at least one tertiary amine being represented by the formula R 4 R 5 NR 6 where R 4 and R 5 are alkyl groups of at least 6 carbon atoms and R 6 is a polyhydroxyl-containing alkyl group or a polyhydroxyl-containing alkoxyalkyl group; (c) a functionalized dispersant component, and (d) at least one diallyl phosphite, provides good lubricant performance for a continuously variable transmission.

First claim

What is claimed is:

1. A lubricant composition comprising:
(a) an oil of lubricating viscosity
(b) at least two nitrogen-containing materials, comprising at least one each of:
(i) about 0.2 to about 3 percent by weight of at least one amide represented by the formula
R 3 C(O)NR 1 R 2

wherein R 1 and R 2 are each independently hydrocarbyl groups of at least 6 carbon atoms and R 3 is a hydroxyalkyl group of 1 to 6 carbon atoms or a group formed by the condensation of said hydroxyalkyl group, through a hydroxyl group thereof, with an acylating agent and
(ii) about 0.03 to about 0.5 percent by weight of at least one tertiary amine represented by the formula
R 4 R 5 NR 6

wherein R 4 and R 5 are each independently alkyl groups of at least 6 carbon atoms and R 6 is a polyhydroxy-containing alkyl group or a polyhydroxy-containing alkoxyalkyl group;
(c) about 2 to about 5 percent by weight of a functionalized dispersant component, comprising one or more dispersants, treated with
(i) 2,5-dimercapto-1,3,4-thiadiazole or hydrocarbyl-substituted 2,5-dimercapto-1,3,4-thiadiazole and
(ii) a borating agent, and optionally
(iii) an inorganic phosphorus compound, and optionally
(iv) an aromatic 1,3-dicarboxylic acid or 1,4-dicarboxylic acid, or a reactive equivalent thereof;

(d) about 0.22 to about 2 weight percent of at least one di-C3-C6 alkyl phosphite; and
(e) about 0.1 to about 1 weight percent of a trialkyl borate, the alkyl groups of which each contain about 4 to about 12 carbon atoms.

2. The lubricant composition of claim 1 , further containing (f) 0.01 to about 0.08 percent by weight of a N,N-di(hydroxyethyl) fatty amine.

3. The composition of claim 1 wherein the amide of (b)(i) comprises a condensation product of glycolic acid with a secondary amine R 1 R 2 NH in which R 1 and R 2 each independently contain about 8 to about 20 carbon atoms.

4. The composition of claim 1 wherein, in component (b)(i), R 1 is 2-ethylhexyl, or mixed alkyl groups comprising a C12 alkyl group, or mixed alkyl groups comprising a C18 alkyl group, and R 2 is mixed alkyl groups comprising a C12 alkyl group or mixed alkyl groups comprising a C18 alkyl group.

5. The composition of claim 1 wherein the amine of (b)(ii) is represented by the formula R 4 R 5 N—CH 2 —CHOH—CH 2 OH, wherein R 4 and R 5 are each independently alkyl groups containing about 8 to about 20 carbon atoms.

6. The composition of claim 1 wherein, in the amine of (b)(ii), R 4 and R 5 each comprise C12 alkyl groups.

7. The composition of claim 1 wherein the dispersant of (c) comprises at least one succinimide dispersant.

8. The composition of claim 1 wherein said dispersant component (c) is treated with about 0.15 to about 3 weight percent 2,5-dimercapto-1,3,4-thiadiazole.

9. The composition of claim 1 wherein said dispersant component (c) contains about 0.4 to about 1.2 percent by weight boron from the borating agent.

10. The composition of claim 1 wherein the borating agent of comprises boric acid.

11. The composition of claim 1 wherein the dispersant component (c) is treated with about 0.003 to about 0.07 weight percent of an aromatic 1,3-dicarboxylic acid or 1,4-dicarboxylic acid, said acid comprising terephthalic acid.

12. The composition of claim 1 wherein the dispersant component comprises a first dispersant species treated with boric acid and terephthalic acid and a second dispersant species treated with boric acid, terephthalic acid, and dimercaptothiadiazole.

13. The composition of claim 1 wherein the dialkyl phosphite of component (d) comprises dibutyl phosphite.

14. The composition of claim 2 wherein the N,N-di(hydroxylethyl) fatty amine of component (f) comprises N,N-di(hydroxyethyl)tallowalkylamine.

15. The composition of claim 2 wherein the N,N-di(hydroxyethyl) fatty amine is present in an amount of about 0.01 to about 0.08 percent by weight.

16. The composition of claim 1 further comprising at least one of an overbased detergent, an additional phosphorus compound, an antioxidant, a corrosion inhibitor, an anti-wear agent, a viscosity modifier, or mixtures thereof.

17. The composition of claim 1 wherein the composition comprises a calcium detergent and wherein the composition contains at least about 300 parts per million by weight of calcium.

18. A method of lubricating a continuously variable transmission, comprising supplying thereto the composition of claim 1 .

19. The method of claim 18 wherein the continuously variable transmission comprises lubricated metal-metal contact drive elements.

20. The method of claim 18 wherein the continuously variable transmission comprises a metal belt or a metal chain in lubricated contact with a metal pulley.

21. The composition of claim 1 further comprising about 0.05 to about 1 percent by weight of a C8-22 alkyl phosphite.

22. A lubricant composition comprising:
(a) an oil lubricating viscosity
(b) at least two nitrogen-containing materials, comprising at least one each of:
(i) about 0.5 to about 1.25 percent by weight of at least one amide being the condensation product of a dialkylamine, wherein the alkyl groups each independently contain about 8 to about 20 carbon atoms, and glycolic acid

and
(ii) about 0.05 to about 0.3 percent by weight of at least one tertiary amine represented by the formula
R 4 R 5 N−CH 2 −CHOH−CH 2 OH

wherein R 4 and R 5 are each independently alkyl groups of at about 8 to about 20 carbon atoms;
about 2 to about 4 percent by weight of a functionalized succinimide dispersant component, comprising one or more dispersants, treated with
(i) 2,5-dimercapto-1,3,4-thiadiazole and
(ii) a borating agent;

(d) about 0.2 to about 0.4 weight percent of dibutyl phosphite; and
(e) about 0.2 to about 0.7 weight percent of a trialkyl borate, the alkyl groups of which each contain about 6 to about 10 carbon atoms.

Assignees

• Sumiejski James L
• Abraham William D
• Vickerman Richard J
• Lubrizol Corp

Inventors

• Sumiejski James L
• Abraham William D
• Vickerman Richard J

Classifications

• C10M2215/042

  containing hydroxy groups; Alkoxylated derivatives thereof · CPC title

• C10N2040/045

  for continuous variable transmission [CVT] · CPC title

• C10M2227/061

  Esters derived from boron · CPC title

• C10N2030/02

  Pour-point; Viscosity index · CPC title

• C10M2207/042

  Epoxides · CPC title