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Transmission composition

Inactive Publication Date: 2006-11-23
AFTON CHEMICAL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0005] According to various embodiments, there is provided a transmission fluid composition comprising a lead corrosion reducing effective amount of at least one lead corrosion inhibitor selected from the group consisting of sulfurized alkylphenols; phosphosulfurized hydrocarbons; substituted or unsubstituted thiocarbamates; substituted or unsubstituted thiazoles; substituted or unsubstituted triazoles; substituted or unsubstituted thiadiazoles; a method for inhibiting lead corrosion of machinery comprising providing to machinery a fluid composition comprising at least one lead corrosion inhibitor selected from the group consisting of sulfurized alkylphenols; phosphosulfurized hydrocarbons; substituted or unsubstituted thiocarbamates; substituted or unsubstituted thiazoles; substituted or unsubstituted triazoles; substituted or unsubstituted thiadiazoles; and a composition comprising at least one lead corrosion inhibitor, wherein the composition meets the standards for an aluminum beaker oxidation test measuring a percent weight loss of a lead coupon.

Problems solved by technology

For copper-lead alloy bushings, regardless of the application, there is general agreement that it is a combination of corrosive and mechanical wear that results in equipment failure.
The shifting clutch bearing assemblies in, for example, automatic transmissions can experience high loads and speeds that result in boundary lubrication.
If either lead or copper is removed from, for example, the bushing matrix, the structure can be undermined and weakened.
This can result in galling of the steel backing and damage to the counter surface.
Generally, insoluble wear debris will be trapped in the filter.
However, if the wear debris reduces the fluid flow rate to such a point that the transmission experiences fluid starvation, there can be loss of hydraulic pressure, loss of the critical functions, and catastrophic failure.
Thus, for any given metal or alloy, wear can be due to the combined influences of additives, basestocks, temperatures, and the application.
While there are similarities between driveline and crankcase fluid applications, there can be significant differences between the areas.
Most newer automatic transmission fluids (ATFs) are not formulated with zinc dialkyldithiophosphates (ZDDPs) which are known to damage the friction material in torque converters and shifting clutches.
The differences between driveline and motor oil formulations and applications may result in some differences between their lead corrosion mechanisms.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

example 1

Corrosion Test for Lubricants

[0031] The component to be tested was weighed to the nearest milligram and charged into a 25 by 150-mm test tube. Typically the components were tested such that their concentration in finished lubricant was 0.04 to 0.5% by weight. 20.0 g of a typical automatic transmission fluid was charged into the test tube. A lead coupon 0.81 cm thick by 2.5 cm square was bent into a semi-circle and inserted into the tube. The tube was placed in an oil bath at 150° C. The tube was gently shaken by hand twice every 24 hours, for about 90 hrs. Upon completion of the test the lead coupon was removed from the fluid and washed with heptane and air dried. The appearance of the coupon and the end of test fluid was recorded. The coupon was washed with THF and wiped clean. The post cleaning weight of the coupon was recorded and the end of test fluid was analyzed for the presence of lead by Inductively Coupled Plasma Atomic Emission Spectroscopy (ICP). Both of these tests meas...

example 2

MERCON Aluminum Beaker Oxidation Test (ABOT), FMC BJ 10-4, Revision 1,—2003

[0038] The test used an aluminum beaker and head that was fitted with a stainless steel drive shaft. The shaft powered a gear pump that circulated the test fluid and pumped air at 5.0 ml / minute. Lead strips were suspended in the fluid to be tested. The lead strip was weighed prior to the start of the test. The fluid was heated to 150° C. for about 100 hours. After 100 hours the lead strip was removed, washed, and wiped of fluid and debris. The post-wipe weight was recorded and the results were reported in terms of percent weight loss relative to the new strip. After the lead strip was removed the test was continued. The end of test measurements on the fluid consisted of the IR, TAN, and kinematic viscosity. Pass / fail limits were based on the change between the new and used measurements. The limit for the 100 hour lead loss is 3% maximum.

[0039] Three runs were conducted on compositions comprising at least on...

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Abstract

There is provided a transmission composition including a lead corrosion reducing effective amount of at least one lead corrosion inhibitor selected from the group consisting of sulfurized alkylphenols; phosphosulfurized hydrocarbons; substituted or unsubstituted thiocarbamates; substituted or unsubstituted thiazoles; substituted or unsubstituted triazoles; substituted or unsubstituted thiadiazoles.

Description

FIELD OF THE DISCLOSURE [0001] The present disclosure relates to a fluid composition comprising at least one lead corrosion inhibitor. The at least one lead corrosion inhibitor provides at least one property chosen from corrosion inhibition, improved wear, improved lubricity, and improved lead compatibility. The transmission fluid composition disclosed herein includes fluids that may be suitable for use in an automatic transmission, dual clutch transmission, continuously variable transmission, and / or a manual transmission. BACKGROUND OF THE DISCLOSURE [0002] Transmissions can have twenty or more parts that contain lead as part of their materials of construction. For example, most of the plain bearings in the shifting clutches in an automatic transmission contain lead in the form of a copper-lead alloy. When a transmission is in operation the lubricant degrades to form oxidation products and additive decomposition products that are corrosive to lead. [0003] For copper-lead alloy bush...

Claims

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Application Information

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IPC IPC(8): C10M141/10
CPCC10M133/44C10M135/02C10N2240/045C10M135/18C10M135/36C10M2207/028C10M2215/223C10M2219/02C10M2219/066C10M2219/104C10M2219/106C10N2230/12C10N2240/042C10N2210/02C10N2030/12C10N2040/045C10N2040/042C10N2010/04
Inventor CULLEY, SCOTT A.
Owner AFTON CHEMICAL
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