Gear oil compositions
US5571445A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Sep 21, 1995 |
| Grant date | Nov 5, 1996 |
| Priority date | — |
| Expiry date | Sep 21, 2015 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC10N2040/02
- WIPO fieldBasic materials chemistry
- WIPO sectorChemistry
Abstract
A "cold-clash" gear problem associated with vehicular manual transmissions exposed to the cold is overcome by use of a special all-synthetic gear oil composition. The composition is composed of base oil and specified additive components. The base oil is a blend of dialkyl ester of an aliphatic dicarboxylic acid having a maximum pour point of about -55.degree. C. and a maximum kinematic viscosity at 100.degree. C. of about 4 cSt, and three hydrogenated poly-.alpha.-olefin oligomers having kinematic viscosities at 100.degree. C. of about 40, about 4-8 cSt and about 2 cSt in specified proportions. The additive components comprise an organic sulfur-containing antiwear and/or extreme pressure agent, an organic phosphorus-containing antiwear and/or extreme pressure agent, a copper corrosion inhibitor, a rust inhibitor, a foam inhibitor, and an ashless dispersant. The gear oil has a boron content of about 0.0025 to about 0.07 wt %.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.