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Power transmission fluid with enhanced friction characteristics

a technology of transmission fluid and friction characteristics, applied in the direction of additives, lubricant compositions, base materials, etc., can solve the problems of unacceptably long or short gear shifts, immediate noticeable performance degradation of the vehicle operator, etc., to minimize equipment and performance problems, minimize vibration, minimize shudder, and/or noise

Inactive Publication Date: 2007-12-20
AFTON CHEMICAL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0002]Automotive power transmission fluids are called upon to provide specific frictional properties under very demanding conditions of temperature and pressure. Changes in a fluid's frictional properties as a function of relative sliding speed, temperature, or pressure as a result of these conditions may cause performance degradation immediately noticeable to the vehicle operator. Such effects may include unacceptably long or short gear shifts, vehicle shudder or vibration, noise, and / or harsh shifts (“gear change shock”). Thus, there is a need for transmission fluids that undergo minimal frictional changes under conditions of high temperatures and pressures. Such fluids would minimize equipment and performance problems while maximizing the interval between fluid changes. By enabling smooth engagement of torque converter and shifting clutches, these fluids would minimize shudder, vibration, and / or noise, and in some cases improve fuel economy, over a longer fluid lifetime. As newer transmissions are developed for improved fuel economy, there continues to be a need for fluids that are specifically formulated for such newer transmissions.
[0003]In view of the ongoing needs for improved transmission fluids, exemplary embodiments of the disclosure provide a power transmission fluid composition, a method of operating a power transmission with the fluid and method of improving friction durability of a power transmission fluid. Power transmission fluids formulated according to the present disclosure provide improved friction durability and improved performance for smooth engagement of torque converter and shifting clutches and minimized shudder, vibration and / or noise, and / or improved fuel economy.

Problems solved by technology

Changes in a fluid's frictional properties as a function of relative sliding speed, temperature, or pressure as a result of these conditions may cause performance degradation immediately noticeable to the vehicle operator.
Such effects may include unacceptably long or short gear shifts, vehicle shudder or vibration, noise, and / or harsh shifts (“gear change shock”).

Method used

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  • Power transmission fluid with enhanced friction characteristics
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Embodiment Construction

[0013]As used herein, the term “hydrocarbyl substituent” or “hydrocarbyl group” is used in its ordinary sense, which is well-known to those skilled in the art. Specifically, it refers to a group having a carbon atom directly attached to the remainder of a molecule and having a predominantly hydrocarbon character. Examples of hydrocarbyl groups include:[0014](1) hydrocarbon substituents, that is, aliphatic (e.g., alkyl or alkenyl), alicyclic (e.g., cycloalkyl, cycloalkenyl) substituents, and aromatic-, aliphatic-, and alicyclic-substituted aromatic substituents, as well as cyclic substituents wherein the ring is completed through another portion of the molecule (e.g., two substituents together form an alicyclic radical);[0015](2) substituted hydrocarbon substituents, that is, substituents containing non-hydrocarbon groups which, in the context of the description herein, do not alter the predominantly hydrocarbon substituent (e.g., halo (especially chloro and fluoro), hydroxy, alkoxy,...

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PUM

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Abstract

A power transmission fluid composition, a power transmission containing the fluid, a method of operating a power transmission with the fluid and method of improving friction durability for a power transmission fluid. The power transmission fluid includes (a) a base oil and (b) an additive composition having therein (i) at least one ashless dispersant; (ii) a metal detergent providing greater than about 100 ppm metal in the power transmission fluid composition; (iii) a friction modifying amount of an imidazoline; (iv) a succinimide friction modifier; and (v) a non-hydroxy tertiary amine friction modifier other than (iii).

Description

FIELD[0001]The present disclosure relates to a power transmission fluid having improved and / or extended durability and enhanced friction characteristics. The present disclosure may comprise a fluid suitable for power transmitting fluids, such as an automatic transmission fluid (ATF) and / or a manual transmission fluid. Power transmitting fluids of the present disclosure may comprise friction modifiers, a borated dispersant, and a metal detergent.BACKGROUND AND SUMMARY[0002]Automotive power transmission fluids are called upon to provide specific frictional properties under very demanding conditions of temperature and pressure. Changes in a fluid's frictional properties as a function of relative sliding speed, temperature, or pressure as a result of these conditions may cause performance degradation immediately noticeable to the vehicle operator. Such effects may include unacceptably long or short gear shifts, vehicle shudder or vibration, noise, and / or harsh shifts (“gear change shock...

Claims

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Application Information

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IPC IPC(8): C10M163/00
CPCC10M163/00C10M2207/028C10N2260/14C10M2215/04C10M2215/086C10M2215/224C10M2215/28C10M2219/046C10N2210/02C10N2230/06C10N2230/76C10N2240/042C10N2240/045C10N2260/12C10N2030/76C10N2030/06C10N2040/042C10N2040/045C10N2010/04C10N2060/12C10N2060/14C10M141/06C10M2201/087C10M2215/223C10M2207/26C10N2040/044C10M169/04C10M125/24C10M125/26C10M101/02
Inventor HENLY, TIMOTHY J.TERSIGNI, SAMUEL H.
Owner AFTON CHEMICAL
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