Method of lubricating a transmission which includes a synchronizer with a non-metallic surface

Patent metadata

Field	Value
Publication number	US-2016208191-A1
Application number	US-201414908580-A
Country	US
Kind code	A1
Filing date	Jul 22, 2014
Priority date	Jul 31, 2013
Publication date	Jul 21, 2016
Grant date	—

Abstract

The invention provides a method of lubricating a transmission which includes a synchronizer with a non-metallic surface, the method comprising supplying thereto a lubricant comprising: (a) an oil of lubricating viscosity; (b) an alkaline earth metal detergent; and (c) a non-aromatic carboxylic acid or a salt thereof having 8 to 24 carbon atoms.

First claim

1 . A method of lubricating a transmission which includes a synchronizer with a non-metallic surface, the method comprising supplying thereto a lubricant comprising:
(a) an oil of lubricating viscosity; up to about 10 percent by weight of alkaline earth metal detergent; and 0.01 to 2 percent by weight of a non-aromatic carboxylic acid or a salt thereof having 8 to 24 carbon atoms.

2 . The method of claim 1 , wherein the non-aromatic carboxylic acid or a salt thereof is premixed with the alkaline earth metal detergent.

3 . The method of claim 1 , wherein the non-aromatic carboxylic acid or a salt thereof and the alkaline earth metal detergent are contacted during a process for preparing an overbased metal detergent in an oil medium comprising the steps of:
(1) providing an organic acid selected from a group consisting of:
a hydrocarbyl-substituted organic sulfonic acid,
a mixture of a hydrocarbyl-substituted organic sulfonic acids,
a metal salt of said organic acid, and
mixtures thereof,
(2) further providing at least one mono-alcohol; (3) further providing a basic metal compound; (4) further providing a carboxylic acid having 6 to 30 carbon atoms (5) reacting the mixture of step (4) with carbon dioxide to form a carbonated overbased metal sulfonate;
wherein the resultant overbased metal detergent has a metal ratio of 5:1 to 27:1 or 12 to 25.

4 . (canceled)

5 . The method of claim 1 , wherein the non-aromatic carboxylic acid or a salt thereof has 14 to 20 carbon atoms.

6 . The method of claim 5 , wherein the non-aromatic carboxylic acid or a salt thereof has 16 to 18 carbon atoms.

7 . (canceled)

8 . The method of claim 1 , wherein the non-aromatic carboxylic acid or a salt thereof is selected from the group consisting of capric acid, decanoic acid, decenoic acid, dodecanoic acid, dodecenoic acid, lauric acid, myristic acid, palmitic acid, oleic acid, stearic acid, or mixtures thereof.

9 . The method claim 8 , wherein the non-aromatic carboxylic acid or a salt thereof is oleic acid, stearic acid, or mixtures thereof.

10 . The method of claim 9 , wherein the non-aromatic carboxylic acid or a salt thereof is stearic acid.

11 . (canceled)

12 . The method of claim 3 , wherein the amount of non-aromatic carboxylic acid or a salt thereof in the overbased metal detergent is about 7 to 9 percent by weight.

13 . The method of claim 3 , wherein the amount of non-aromatic carboxylic acid in the lubricant is 0.02 to 1 wt % of the lubricating composition.

14 . (canceled)

15 . (canceled)

16 . The method of claim 1 , wherein the alkaline earth metal detergent comprises calcium.

17 . The method according to claim 16 , wherein the alkaline earth metal detergent is an overbased, carbonated calcium arylsulfonate detergent or carbonated calcium phenate detergent.

18 . (canceled)

19 . (canceled)

20 . (canceled)

21 . The method of claim 17 , wherein the arylsulfonate detergent comprises an alkylarylsulfonate anion in which the alkyl group contains about 12 to about 36 carbon atoms.

22 . The method of claim 17 , wherein the arylsulfonate is an alkyl-substituted benzenesulfonate or an alkyl-substituted toluenesulfonate.

23 . The method of claim 16 , wherein the amount of calcium in the lubricant is about 0.03 to about 1.0 weight percent.

24 . The method according of claim 17 , wherein the amount of the overbased, carbonated calcium arylsulfonate detergent in the lubricant is about 0.14 percent to about 4 percent by weight, or about 0.14 percent to about 3 percent by weight.

25 . (canceled)

26 . (canceled)

27 . The method of claim 17 , wherein the carbonated calcium arylsulfonate detergent has a TBN of about 650 to about 1000.

28 . (canceled)

29 . The method of claim 1 , wherein the alkaline earth metal detergent has a metal ratio in the range of 5 to 40, or 10 to 40, or 11 to 30.

30 . The method of claim 29 , wherein the alkaline earth metal detergent has a metal ratio 12 to 25.

31 . The method according to claim 1 , wherein the lubricant further comprises a dialkylphosphite.

32 . The method of claim 1 , wherein the lubricant further comprises a succinimide dispersant which has been treated with at least one of a borating agent and terephthalic acid.

33 . The method of claim 1 , wherein at least one lubricated non-metallic surface in the said synchronizer comprises one of carbon fibers, phenolic resin, graphitic carbon materials or cellulosic materials.

34 . (canceled)

Assignees

• Lubrizol Corp

Inventors

• Walker Gary M
• Brown Gareth

Classifications

• C10N2040/04

  Oil-bath; Gear-boxes; Automatic transmissions; Traction drives · CPC title

• C10M2219/106

  Thiadiazoles · CPC title

• C10N2070/00

  Specific manufacturing methods for lubricant compositions · CPC title

• C10M2207/122

  monocarboxylic · CPC title

• C10N2010/02

  Groups 1 or 11 · CPC title