Method for lubricating a continuously variable transmission
The present invention relates to compositions useful as transmission fluids, and particularly as fluids for continuously variable transmissions, and their use in lubricating continuously variable transmissions. Continuously variable transmissions are lubricated by supplying to the transmission a com...
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| Main Authors | , , |
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| Format | Patent |
| Language | English |
| Published |
04.05.2004
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| Online Access | Get full text |
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| Summary: | The present invention relates to compositions useful as transmission fluids, and particularly as fluids for continuously variable transmissions, and their use in lubricating continuously variable transmissions.
Continuously variable transmissions are lubricated by supplying to the transmission a composition of an oil of lubricating viscosity and an oil-soluble zinc salt containing at least one hydrocarbyl group of at least 4 carbon atoms. The amount of the zinc salt is sufficient to provide an increased steel-on-steel dynamic coefficient of friction for the composition, being at least 0.125. The composition is substantially free from thiophosphate salts and exhibits a copper corrosion rating of 1B or better (ASTM-130). |
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