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Extended Life Lubricant for Precision Mechanisms

IP.com Disclosure Number: IPCOM000079170D
Original Publication Date: 1973-May-01
Included in the Prior Art Database: 2005-Feb-26
Document File: 1 page(s) / 12K

Publishing Venue

IBM

Related People

Martin, JT: AUTHOR [+2]

Abstract

The viscosity of transmission fluids is normally found to be in the vicinity of 18O SUS, whereas in many precision machine applications a viscosity in the range of 70 to 90 SUS is desired. Since an oil that oxidizes easily or has a poor oxidation resistance will polymerize and increase in carbon-chain length resulting in increased viscosity, it is necessary that any modification of a transmission fluid, to reduce viscosity, does not compromise the oxidation resistance of the resulting lubricant.

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Extended Life Lubricant for Precision Mechanisms

The viscosity of transmission fluids is normally found to be in the vicinity of 18O SUS, whereas in many precision machine applications a viscosity in the range of 70 to 90 SUS is desired. Since an oil that oxidizes easily or has a poor oxidation resistance will polymerize and increase in carbon-chain length resulting in increased viscosity, it is necessary that any modification of a transmission fluid, to reduce viscosity, does not compromise the oxidation resistance of the resulting lubricant.

It has been found that combining a type-A transmission fluid and a highly refined white mineral oil not only achieves superior lubrication qualities, but maintains viscosity over an extended period with a lesser percentage change than either of the oils of the combination individually. The range of concentrations utilized extends from approximately 25% to 75% type-A transmission fluid by volume, with the balance highly refined white mineral oil; the optimum combination is approximately 50% of each component.

Type-A transmission fluid comprises a highly compounded mineral oil including an antioxidant, such as alkaline earth metal salt of petroleum sulfonic acid, and further comprises a friction modifier in the form of a fatty ester, for example, methylstearate.

The highly refined white mineral oil, as the other component of the lubricant, should not exceed a viscosity of 180 SUS and meet the purity and test requirements of t...