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Power transmission fluids with enhanced antishudder durability and handling characteristics

Inactive Publication Date: 2006-04-13
AFTON CHEMICAL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0014] An aspect of the present invention relates to an improved power transmitting fluid having enhanced friction durability and μ / v characteristics, particularly one that can exhibit a positive μ / v curve and can maintain high static capacity during expected use, on paper, steel, and advanced friction materials such as carbon fiber.
[0016] In an aspect of the present invention, a composition and a method of improving the anti-shudder durability of power transmitting fluids, particularly automatic transmission fluids, are provided.
[0022] The present invention includes such further embodiments as a method for improving the stability against oxidation degradation, e.g. promoting the duration of a relatively constant dynamic coefficient of friction, in a power transmission fluid by incorporating into the fluid an effective amount of a friction modifier compound(s) represented by a formula I to VI described herein.

Problems solved by technology

These new systems often involve high energy requirements.
The continuing search for methods to improve overall vehicle fuel economy has identified the torque converter, or fluid coupling, used between the engine and automatic transmission, as a relatively large source of energy loss.
Since the torque converter is a fluid coupling it is not as efficient as a solid disk type clutch.
However, when they are used at low speeds, vehicle operation is rough and engine vibration is transmitted through the drive train.
Rough operation and engine vibration are not acceptable to drivers.
Clutch shudder is very objectionable to the driver.
It presents a unique challenge of providing high steel-on-steel friction for the variator and excellent paper-on-steel friction for the slipping clutch.

Method used

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  • Power transmission fluids with enhanced antishudder durability and handling characteristics
  • Power transmission fluids with enhanced antishudder durability and handling characteristics
  • Power transmission fluids with enhanced antishudder durability and handling characteristics

Examples

Experimental program
Comparison scheme
Effect test

example 1

[0140] Reaction of isostearic acid with triethylenetetramine (TETA) was performed in a 2 L 3-neck round bottom flask, equipped with a pressure equilibrated addition funnel, distillation condenser, and a mechanical stirrer. To stirred isostearic acid (405.3 g), TETA (153.0 g) was added drop-wise at 75° C. Addition continued slowly below 100° C. until the reaction is no longer exothermic. After addition of the remaining amine, vacuum was applied (28″ Hg) with caution and temperature was increased gradually to 150° C. The mixture was stirred under vacuum for 19 hours. The reaction was expected to form 44.9 g. of water. Total of 48.2 g of volatile material was collected in a dry-ice trap.

[0141] Following analysis, these results were obtained for the product: TAN (D-664) 3.1 mg KOH / g; TBN (D-2869) 262.8 mg KOH / g; KV (100) 20.22 cSt; N:10.97% (Calc'd: 11.41%). IR (cm−1): 1660, 1613, 1459, 1248, 1004, 726.

example 2

[0142] Reaction product of Example 1 (67.2 g), a diluent oil (76.2 g) and C20-24 alkyl succinic anhydride (87.5 g) from Dixie Chemical Company were charged into a 500 mL round bottom flask equipped with a distillation condenser and a mechanical stirrer. The mixture was stirred at 100° C. under vacuum (28″ Hg) for 1 hour. Analysis of the resulting product gave: TAN (D-664) 31.1 mg KOH / g; TBN (D-2869) 37.6 mg KOH / g; N, 3.18% (Calc'd: 3.38%). IR (cm−1): 1771, 1705, 1649.

example 3

[0143] Reaction product of Example 1 (55.33 g), a diluent oil (55.91 g) and 200 mol. wt. PIBSA (56.29 g) having activity of 3.34 meq / g were reacted under conditions described in Example 2. Analysis of the resulting product gave TAN (D-664) 28.8 mg KOH / g; TBN (D-2869) 43.5 mg KOH / g; N, 3.61% (Calc'd: 3.68%). IR (cm−1): 1778, 1705, 1642.

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PUM

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Abstract

A finished power transmitting fluid having enhanced friction durability and improved μ / v characteristics on paper, steel and advanced friction materials such as carbon fiber, and which may provide a lubricant composition that carries minimal concern for skin sensitization and related health, safety, and environmental issues, can contain lubricating base oil, a friction modifier produced by reacting a polyamine with an aliphatic mono acid such as oleic or isostearic acid under conditions to form a mixture of 1,2-disubstituted imidazoline containing components, wherein further acylation of residual active nitrogens with mono or diacids or anhydrides affords friction modifier compositions having enhanced frictional and handling characteristics.

Description

FIELD OF THE INVENTION [0001] The present disclosure relates to fluids having improved friction durability and μ / v characteristics on paper, metal and advanced friction materials. The fluids disclosed herein can exhibit improved handling characteristics, and improved anti-shudder durability. The invention includes devices, such as a power transmission apparatus, lubricated with such fluids. BACKGROUND OF THE INVENTION [0002] New and advanced transmission systems are being developed by the automotive industry. These new systems often involve high energy requirements. Therefore, component protection technology must be developed to meet the increasing energy requirements of these advanced systems, to promote fuel economy, and to extend satisfactory friction requirements at low and high speeds. [0003] These new and advance transmissions used in passenger cars and heavy duty vehicles continue to become more sophisticated in design as vehicle technology advances. These design changes resu...

Claims

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Application Information

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IPC IPC(8): C10M133/46F16H57/04
CPCC10M133/44C10M135/32C10M141/06C10M141/08C10M2205/173C10M2215/224C10M2219/09C10N2220/02C10N2240/04C10N2240/042C10N2240/044C10N2240/045C10N2040/04C10N2020/01C10N2040/042C10N2040/044C10N2040/045C10M125/20
Inventor OZBALIK, NUBAR
Owner AFTON CHEMICAL
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