Prolonged discharge and thermal stabilized gear oil formula

A technology of gear oil and base oil, which is applied in the petroleum industry, specific vehicle lighting, lighting and heating equipment, etc. It can solve the problems that the processing rate cannot be provided, the lack of EP performance, and the phosphite cannot provide high-temperature wear protection and running-in performance. Achieve excellent thermal stability

Active Publication Date: 2004-08-11
ETHYL JAPAN
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although alkyl tert-butyl trisulfides are thermally stable, they lack sufficient EP properties and cannot provide acceptable GL-5 impact properties without extremely high treat rates or the addition of additional EP components
In addition, phosphites may react with trisulfides to form undesirable smelly mercaptan by-products
Finally, phosphites do not provide sufficient run-in properties for high temperature wear protection

Method used

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  • Prolonged discharge and thermal stabilized gear oil formula
  • Prolonged discharge and thermal stabilized gear oil formula
  • Prolonged discharge and thermal stabilized gear oil formula

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0074] The components of the gear oil blends of the present invention are included in Table 1.

[0075] sample

A

B

C

D

E

F

wear resistance

Phosphorodithioate

Y

Y

Y

Y

Y

Y

Thiophosphate

Y

Y

Y

Y

dialkyl phosphite

Y

acid phosphate

Y

Y

Y

Y

EP additive

SIBs

SIBs

Di-tert-butyl

polysulfide

Trisulfide

compounds

Di-tert-butyl

polysulfide

Trisulfide

compounds

Sulfur activity of EP

55

55

126

4

126

4

metal cleaner

none

none

none

none

none

none

% sulfur from packaging

1.5

1.5

1.4

1.4

1.4

1.4

% phosphorus from packaging

0.13

0.19

...

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PUM

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Abstract

In its broadest concept, the present invention relates to an improved gear oil comprising: a) a base oil having a viscosity range of 4 to 32 cSt at 100 DEG C; b) a maximum level of hydrocarbyl polysulfide with a minimum level of active S species; c) a dihydrocarbyl dithiophosphate ester or salt; and d) a dihydrocarbyl (mono)thiophosphate amine salt, essentially free of phosphite.

Description

technical field [0001] The present invention relates to gear oil compositions that meet the requirements of both manually operated transmissions and final drive automotive gears, that are low in odor, provide acceptable GL-4 and GL-5 performance, have high temperature oxidation stability, wear protection, Copper passivation and satisfactory synchronous device performance without the use of metal cleaners. Background technique [0002] The present invention relates to gear oils for use in heavy duty (HD) shaft and transmission applications, and more particularly, the present invention relates to extended drain thermally stable gear oils. [0003] Because of the extreme conditions to which manually operated transmissions and shafts are subjected, gear oils are not the same as other lubricants. A major difference between gear oil compositions and other lubricants is the presence of an extreme pressure agent (EP). These EP agents often contain large amounts of sulfur, which is ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C10M169/04C10M135/04C10M135/22C10M137/10C10M139/00C10M141/10C10M159/16C10N20/02C10N30/06C10N30/08C10N30/10C10N30/12C10N40/04
CPCC10N2240/044C10M2223/047C10M2217/043C10M2215/28C10M141/10C10M2219/022C10N2040/044B60Y2200/30B61D29/00B60Q3/46F21Y2115/10
Inventor J·L·米尔纳关雅夫八并宪治R·M·舍茨
Owner ETHYL JAPAN
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