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Relatively low viscosity transmission fluids

A transmission fluid, low viscosity technology, applied in the field of transmission applications, can solve the problems of anti-wear and extreme pressure characteristics, and achieve the effect of good steel-steel friction and excellent friction durability

Inactive Publication Date: 2007-07-25
AFTON CHEMICAL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the antiwear and extreme pressure properties of a fluid are largely influenced by the viscosity of the transmission fluid used

Method used

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Embodiment Construction

[0040] As used herein, the term "hydrocarbyl substituent" or "hydrocarbyl" is used in its ordinary meaning, which is well known to those skilled in the art. Specifically, it refers to a group having a carbon atom directly attached to the rest of the molecule and having a predominantly hydrocarbon character. Examples of hydrocarbyl groups include:

[0041] (1) Hydrocarbon substituents, that is, aliphatic substituents (such as alkyl or alkenyl), cycloaliphatic substituents (such as cycloalkyl, cycloalkenyl); and aromatic-, aliphatic- and cycloaliphatic Substituted aromatic substituents, and cyclic substituents, where the ring is closed by another part of the molecule (eg, two substituents together form a cycloaliphatic group);

[0042] (2) Substituted hydrocarbon substituents, i.e. substituents comprising non-hydrocarbon groups which, in the context of this specification, do not alter the predominant hydrocarbon substituents such as halogen (especially chlorine and fluorine), h...

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Abstract

A relatively low viscosity transmission fluid composition, transmissions containing the fluids, and methods of operating motor vehicles with the fluids are described. The transmission fluid composition includes a lubricant basestock, at least one active sulfur-containing component, and at least one phosphorus-containing compound. An active sulfur atom content of the composition is greater than about 0.02 wt. %, and a ratio of active sulfur atoms to phosphorus atoms in the composition is above about 5. The composition has a viscosity at 100 DEG C. ranging from about 4 to less than about 7 centistokes.

Description

technical field [0001] The present invention relates to lubricating fluid compositions having relatively low viscosity for use in transmission applications, particularly for automated manual transmissions. The fluid composition has enhanced extreme pressure and antiwear properties despite the relatively low viscosity of the fluid composition. Background technique [0002] The automotive industry is developing new and advanced drivetrains that can be used in high fuel economy vehicles such as hybrid vehicles. Such drive trains include continuously variable transmissions (CVTs) and automated manual transmissions such as dual clutch transmissions (DCT) and double clutch transmissions (DSCT). Fuel economy is one of the main benefits that DCTs, DSCTs and CVTs can provide. Relatively lower viscosity fluids can provide greater fuel economy. However, the antiwear and extreme pressure properties of a fluid are largely influenced by the viscosity of the transmission fluid used. In...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C10M159/00C10N40/04C10N30/02
CPCC10M2219/08C10N2240/042C10M2219/044C10M2219/024C10M141/10C10N2240/045C10M2219/022C10M2219/00C10M2223/00C10N2230/54C10M2219/106C10M171/02C10N2030/54C10N2040/045C10N2040/042C10M125/06C10M125/24
Inventor J·L·米尔纳R·N·耶尔S·H·特尔西尼
Owner AFTON CHEMICAL
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