Lubricating oil composition for automatic transmissions

a technology of automatic transmission and lubricating oil, which is applied in the direction of lubricant composition, liquid carbonaceous fuel, additives, etc., can solve the problems of engine vibration transmission, rough vehicle operation, and insufficient improvement of fuel economy, and achieve prolonged shudder inhibition and high torque transmission capacity

Inactive Publication Date: 2007-08-02
CHEVRON JAPAN +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0016] The present invention provides a lubricating oil composition employable in automatic transmissions of internal combustion engines. The lubricating oil composition of the present invention has a high torque transmission capacity and prolonged shudder inhibition when used as an automatic transmission fluid (ATF) in automatic transmissions of internal combustion engines.

Problems solved by technology

However, since the torque variation produced by the operation of the lockup clutch sometimes disturbs passengers due to shudder, the lockup clutch is generally set to operate only under high speed driving conditions giving less torque variation.
Therefore, enough improvement of fuel economy is not attained.
At low road speeds vehicle operation is rough and engine vibration is transmitted through the drive train.
Rough operation and engine vibration are not acceptable to drivers.
However, if too much friction modifier is incorporated into a lubricating oils the friction coefficient of the wet clutch extremely decreases and hence enough torque transmission capacity cannot be obtained.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

example 1

Preparation of the Amide Compound

[0081] In one aspect, the amide compound employed in the lubricating oil composition of the present invention is a reaction product prepared from monovalent aliphatic acid, urea and polyalkylenepolyamine.

[0082] In a four-necked flask equipped with a stirrer, a thermometer, and a dehydrating device were placed 1,034 g (3.5 mol) of isostearic acid and 15 g (0.25 mol ) of urea. The resulting mixture was heated to 100° C., and 137.5 g (0.5 mol) of hexaethyleneheptamine was dropwise added to the heated mixture under replacement of the reaction atmosphere with nitrogen gas. After the addition was complete, the reaction mixture in the flask was gradually heated to reach 160° C. within 3 hours. Water produced by the reaction in the course of heating was removed from thee flask. Finally the pressure of inside of the flask was reduced to 6.7 kPa, so as to completely remove the produced water. The finally obtained reaction product (reaction product A) was a b...

example 2

[0083] The lubricating oil composition of the present invention was prepared by blending the following components in the designated amounts.

Weight part(s)Succinic acid ester3.0Succinimide0.5Borated succinimide0.5Overbased calcium sulfonate (TBN = 320)0.15Amide compound1.0Oleic acid0.25Tertiary alkyl (C12-14) primary amine0.1Diphenyl hydrogen phosphite0.15Tolyltriazole0.12,5-Bis(hydrocarbyldithio)-1,3,4-thiadazole0.03Dioctyldiphenylamine0.42,6-Di-t-butylphenol0.25Silicone oil (anti-foaming agent)0.002Nitrogen-containing polymethacrylate5.7(viscosity index improver)Base oil (refined mineral oil)87.768

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Abstract

The present invention relates to a lubricating oil composition comprising a major amount of base oil of lubricating viscosity and the following additives in the following amounts based on a total amount of the lubricating oil composition: (A) 0.1 to 10 wt.% of a succinic acid ester, (B) 0.01 to 2 wt.% of a phosphorous acid ester, (C) 0.1 to 5 wt.% of an amide compound which is a reaction product obtained by reaction of a linear or branched, saturated or unsaturated monovalent aliphatic acid having 8 to 22 carbon atoms, urea, and polyalkylenepolyamine, (D) 0.0 1 to 2 wt.% of an overbased metal containing detergent, and (E) 0.01 to 1 wt.% of a corrosion inhibitor.

Description

[0001] The present invention relates to a lubricating oil composition, In particular, the invention relates to a lubricating oil composition for automatic transmissions of internal combustion engines, in which the lubricating oil composition shows a high torque transmission capacity and a prolonged shudder inhibition. BACKGROUND OF THE INVENTION [0002] Automatic transmissions in automobiles comprise a torque converter, a wet multi-plate clutch, a gear mechanism, and a mechanism controlling these elements. The torque transmission capacity is automatically set according to the speed of automobile and the degree of load. Modern automatic transmissions further comprise a lockup clutch mounted to the torque converter so as to improve fuel economy. The use of thee lockup clutch enables engine torque to be transmitted to the automatic transmission according to driving conditions in addition to the driving force transmitted through a lubricating oil. However, since the torque variation prod...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): C10M169/04C10L1/22
CPCC10M129/72C10N2260/14C10M137/02C10M163/00C10M2203/1006C10M2207/026C10M2207/126C10M2207/282C10M2207/34C10M2215/04C10M2215/064C10M2215/08C10M2215/223C10M2219/046C10M2223/04C10M2223/049C10M2229/02C10N2210/02C10N2230/06C10N2240/042C10M133/16C10N2010/04C10N2030/06C10N2060/14C10N2040/042
Inventor SHIGA, MICHIOSHIROI, TOMOTSUGUTAKAYAMA, HIMIKOBUITRAGO, JUAN A.
Owner CHEVRON JAPAN
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