Automatic transmission fluids with improved anti-shudder properties

a technology of automatic transmission and anti-shudder, which is applied in the direction of lubricant composition, organic chemistry, fuels, etc., can solve the problems of unsatisfactory performance of old standards of performance previously met with approval, not all additives interact predictably or well with one another, and are one of the most expensive to diagnose, repair or repla

Inactive Publication Date: 2002-10-17
SRINIVASAN SANJAY +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, not all additives interact predictably or well with one another.
It being one of the most complex systems in the vehicle, it is also one of the most costly to diagnose, repair, or replace.
However, with the advent of new transmission technologies, old standards of performance which were previously met with approval are now becoming unacceptable.

Method used

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  • Automatic transmission fluids with improved anti-shudder properties
  • Automatic transmission fluids with improved anti-shudder properties
  • Automatic transmission fluids with improved anti-shudder properties

Examples

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Embodiment Construction

[0140] Illustrative compositions suitable for use in the practice of this invention are presented in the following Examples, wherein all parts and percentages are by weight unless specified otherwise.

[0141] The fluids prepared in the Examples were then subjected to testing under commonly known tests, including the low speed SAE #2 rig, under the conditions noted, and the GM plate clutch friction test (GM performance specification GM 6417 M, April 1997) run according to Dexron.RTM. III procedures. Briefly, this test involves engaging the clutch at the rate of four cycles per minute for 100 hours (i.e., 24,000 cycles) at 135 degrees C. The DEXRON.RTM. III Band Clutch Test limit for the mid-point torque is 185-220 Nm.

[0142] The GM Dexron III Cycling Test (GM-6297-M), revised April 1993; corresponding to the Ford Mercon V Friction Durability Test (Dexron 5 Specification 3.9, Revised Jul. 1, 1996 and Oct. 1, 1998 which sets limits on shift times for 20,000 shift cycles. Shifting from 1st...

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Abstract

Automatic transmission fluids are described which contain at least 0.2 wt % of a metal-containing detergent, a dispersant, and a mixture of friction modifiers. The transmission fluids according to the present invention exhibit excellent initial anti shudder properties, excellent anti-shudder durability, and excellent friction durability.

Description

[0001] There are no related applications.BACKGROUND OF THE INVENTION 1. Field of the Invention[0003] This invention relates to oil-based automatic transmission fluid compositions having excellent slip-stick characteristics, anti-shudder performance, and friction durability. More specifically, a preferred aspect of the invention relates to a use of the automatic transmission fluid in electronically controlled converter clutch (ECCC) applications.[0004] 2. Description of the Prior Art[0005] U.S. Pat. No. 5,578,236, to Ethyl Corporation discloses a power transmission fluid with enhanced performance characteristics. The power transmission fluid composition disclosed therein has, inter alia, an oil-soluble boron content of about 0.001 to about 0.1%, an oil soluble phosphorus content of about 0.005 to about 0.2%, and an oil soluble metal additive content of from 0 to about 100 ppm.[0006] The composition of the '236 patent comprises at least about 50 weight % hydrotreated mineral oils in t...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): C10M129/10C10M133/06C10M133/08C10M133/16C10M133/44C10M135/10C10M137/02C10M139/00C10M159/22C10M159/24C10M163/00C10M167/00C10M169/04C10N10/04C10N30/00C10N30/04C10N30/06C10N40/04
CPCC10M163/00C10N2260/14C10M169/045C10M2207/026C10M2207/028C10M2215/04C10M2215/042C10M2215/064C10M2215/082C10M2215/224C10M2215/28C10M2219/046C10M2223/049C10N2210/02C10N2230/06C10N2240/042C10N2260/12C10M167/00C10N2010/04C10N2030/06C10N2040/042C10N2060/12C10N2060/14
Inventor SRINIVASAN, SANJAYIYER, RAMNATH N.OZBALIK, NUBAR
Owner SRINIVASAN SANJAY
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