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Fluid lubricant

a fluid lubricant and fluid technology, applied in the field of fluid lubricant, can solve the problems of limiting the temperature range of operation, difficult to find additives, and degradation of tractive drive, and achieve the effects of low viscosity, high traction coefficient, and low viscosity

Inactive Publication Date: 2006-05-18
ARCH TECH HLDG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0008] The present invention relates to a fluid lubricant for use in transmission of power. The fluid lubricant is a liquid lubricant that includes a base fluid and performance additives. The base fluid includes a low-temperature control agent and a traction component. The low-temperature control agent is preferably an oligomer or polymer of linear dimers of hydrogenated alphaolefins. The low-temperature control agent is included to ensure viscosity of the fluid lubricant remains low over a wide temperature range and in particular a low viscosity at temperatures of −40° C. or less. The traction component is a hydrocarbon with non-aromatic cyclic moieties and preferably a linear dimer of alpha-methyl styrene. The traction component is particularly suited for use in fluid lubricants because of its high traction coefficient. The performance additives are selected from the group consisting of friction modifiers, antioxidants, antiwear and extreme pressure additives, dispersants, metal deactivators, viscosity index improvers, defoamers, and mixtures thereof, in an amount sufficient to improve durability performance of the fluid lubricant.
[0009] The present invention is formulated to produce a fluid lubricant that possesses a low viscosity over a wide temperature range, including temperatures at or below −40° C., a high traction coefficient, increased noise reduction, decreased pressure, and low foaming. The above characteristics ensure that a fluid lubricant is formulated that will aide in peak performance of traction devices over diverse conditions. Specifically, the fluid's characteristics provide a fluid that will improve the performance of a belt or chain CVT by allowing the belt or chain CVT to operate with a high traction coefficient, over a wide temperature range.

Problems solved by technology

If the elements did contact, friction between the elements will generate heat and cause increased wear on the elements, leading to a degradation of the tractive drive.
It is well known, however, that these fluids do not possess the characteristics, which enable them to perform satisfactorily in demanding applications, such as conditions that are typically associated with chain and belt CVT.
As a result of the increased performance requirements imposed on these fluid lubricants it has become difficult to find additives which increase the performance properties of the fluid lubricant, but do not cause other problems, such as limiting the temperature range of operation, increased corrosion, or a lowered traction coefficient.
Conventional fluid lubricants contain varying amounts of components that when in use will cause excessive foaming.
The required defoamers decrease the effectiveness of conventional fluid lubricants because over time the defoamers lose the ability to decrease foaming.
Defoamers found in conventional fluid lubricants lose effectiveness due to settling, oxidation, or shearing, which cause the fluid lubricant to foam during use.

Method used

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  • Fluid lubricant

Examples

Experimental program
Comparison scheme
Effect test

example 4

[0034] Fluid lubricants were tested with varying amounts of AMS:PAO ratios by weight at ambient conditions. The fluid lubricants were tested to determine the actual coefficient of traction versus the calculated coefficient of traction. The AMS and PAO constituents were combined in a beaker and mixed with a magnetic stir rod until the fluid lubricant mixture was created. The fluid lubricants prepared with the varying ratios of 20:80, 30:70, and 40:60 were analyzed and the below data was collected.

Coefficient100%100%AMS:PAOAMS:PAOAMS:PAOof TractionAMSPAO20:8030:7040:60Calculated0.0350.0420.057Actual0.0950.0200.0520.0600.075

[0035] The data above illustrates the synergistic relationship discovered between the AMS and PAO components. The AMS and PAL when combined to produce the fluid base have a synergistic effect on the fluid lubricant mixture. The synergistic effect causes the fluid lubricant to possess a coefficient of traction that is higher than calculated. The coefficient of trac...

example 1

[0042] AMS and PAO 4 were blended together at a ratio of 20:80 by weight at ambient conditions to form the base fluid. Performance additives were then added to the base fluid and are as follows: [0043] VI improver, Crompton Corp, CP80 at 2.00 Wt % [0044] Friction Modifier, Exxon Mobil®, DIDA at 5.00 Wt % [0045] Antioxidant, Ciba® LO6 at 0.75 Wt % [0046] Antiwear agent, Ciba® TPPT at 1.25 Wt % [0047] Antifoam agent, Ultra additives Foamban 130B at 0.1 Wt %

[0048] The fluid lubricant prepared with the 20:80 ratio of AMS:PAO 4 was analyzed and the below data was collected.

Physical Properties

[0049]

PropertiesResultsViscosity at 100° C.7.4cStViscosity at 40° C.40.3cStViscosity at −40° C.13,500cStCoefficient of Traction0.052Four-ball wear Test0.45Evaporation Loss at 155° C. / 100 hours4.6Foam Test seq I10mlOxidation Stability Test,192 hrs at 170° C.Viscosity Change %2.8Total Acid number change0.23Copper Corrosion 100° C. / 24 hours1APour Point Temperature−56°C.

[0050] The data above illustrat...

example 2

[0058] AMS and PAO 4 were blended together at a ratio of 40:60 by weight at ambient conditions to from the base fluid. The performance additives as described in example 1 were then added to the base fluid.

[0059] The fluid lubricant prepared with the 40:60 ratio of AMS:PAO 4 was analyzed and the below data was collected.

Physical Properties

[0060]

PropertiesResultsViscosity at 100° C.7.3cStViscosity at 40° C.41.3cStViscosity at −40° C.19,500cStCoefficient of Traction0.075Four-ball wear Test0.46Evaporation Loss at 155° C. / 100 hours7.6Foam Test seq I15mlOxidation Stability Test,192 hrs at 170° C.Viscosity Change %4.8Total Acid number change0.43Copper Corrosion 100° C. / 24 hours1APour Point Temperature−54°C.

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Abstract

The present invention relates to a fluid lubricant for use in transmission of power in tractive drives. More particularly, the invention is related to a mixture of a hydrocarbon with non-aromatic cyclic moieties, a polyalphaolefin, and performance additives.

Description

FIELD OF INVENTION [0001] The present invention relates to a fluid lubricant particularly adapted for use as a lubricant in tractive drives. More particularly, the invention is related to a fluid formed from a mixture of an alpha-methyl styrene and a polyalphaolefin. BACKGROUND OF INVENTION [0002] A conventional tractive drive or friction drive device is composed of at least two relatively rotatable members in a torque transmitting relationship. Torque (power) is transmitted from an input element to an output element through a nominal point or line contact, typically with a rolling action, by virtue of the traction from the proximal contact between the elements. The contact between the elements provides a means to transfer power from one source to a secondary element. Tractive drives can be used in automotive or industrial machinery to transmit power between rotating members. In particular, tractive drive devices are suited for use in transmissions and more particularly for continuo...

Claims

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Application Information

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IPC IPC(8): C10M143/00
CPCC10M111/04C10M169/04C10M2203/06C10M2203/065C10M2205/0206C10N2230/06C10N2230/10C10N2230/18C10N2230/74C10N2240/046C10N2030/06C10N2030/10C10N2030/18C10N2030/74C10N2040/046
Inventor HAMID, SIBTAIN
Owner ARCH TECH HLDG
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