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Fluid compositions for dual clutch transmissions

Inactive Publication Date: 2006-11-23
IYER RAMNATH N +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0013] In another aspect, the present disclosure relates to a method for increasing steel-on-steel friction, stabilizing steel-on-steel friction, and / or delivering good synchronizer performance by lubricating a transmission with a lubricating transmission composition including a major amount of a base oil and an additive composition as described herein.

Problems solved by technology

However, these DCT's differ from automated manual transmissions since the DCT's typically do not include a torque converter.

Method used

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  • Fluid compositions for dual clutch transmissions
  • Fluid compositions for dual clutch transmissions
  • Fluid compositions for dual clutch transmissions

Examples

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examples

[0105] Fluids for testing were prepared in targeted basestocks. The fully formulated fluids were prepared by adding components together in proportions shown below:

TABLE 1Antiwear / Extreme Pressure0.05-1.0%AgentsAntioxidants 0.1-0.6%Rust Inhibitors0.01-0.2%DMOP0.10-0.6%Antifoam agents0.01-0.1%Friction Modifier 0.3-1.0%Dispersant A 1-6%Seal Swell Agents 0-10%Polymethacrylate VII 3-25%Basestock 60-90%Diluent Oil 2-5%

Dispersants used are succinimide dispersants that may or may not contain boron and / or phosphorus. The friction modifier was a succinimide having a C18-C24 alkenyl group. DMOP is dimethyl octadecylphosphonate. Additional friction modifiers may be used to tailor friction requirements.

[0106] Dispersant and friction modifiers provide appropriate torque capacity. Fluid compositions containing dispersant and succinimide friction modifiers have been developed to provide good friction durability. FIG. 1 is a comparison of the friction characteristics of Fluid A (Table 2) contain...

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Abstract

An additive composition and lubricating fluid are disclosed that provide high steel-on-paper friction durability, good metal-metal extreme pressure performance characteristics and synchronizer performance. The lubricating fluid includes a base oil, a succinimide dispersant, a succinimide friction modifier, and a phosphonate. Also disclosed is a method for lubricating a dual clutch transmission employing a plurality of wet clutches, with the lubricating fluid of the disclosure.

Description

BACKGROUND [0001] 1. Field [0002] The present disclosure relates to a lubricant and a method for lubricating an automated dual clutch transmission having a plurality of wet clutches. [0003] 2. Brief Description of the Prior Art [0004] Dual clutch transmissions, also known as double clutch or twin clutch transmissions, of a variety of types are known. Dual clutch transmissions are known to employ either dry or wet clutches. Some dual clutch transmissions employing wet clutches include hydrodynamic torque converters. For example, European publication EP 1 052 421 A, Nov. 15, 2000, discloses a multiple clutch system for a transmission, with two multi-disk clutches that are coaxial with each other, and each clutch is assigned to one of two shafts. The two clutches are arranged in a sealed chamber, which contains lubricating oil. [0005] Volkswagen, for example, has introduced an automated dual clutch transmission (DCT) in Europe. Progressive improvements in the design and performance of ...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): C10M141/12F16H57/04
CPCC10M141/10C10M2215/086C10M2215/28C10M2223/06F16H57/041C10N2230/40C10N2240/04C10N2260/12C10N2260/14C10N2230/06C10N2030/06C10N2040/04C10N2060/12C10N2060/14C10N2030/40C10M125/24C10M125/26C10M137/02
Inventor IYER, RAMNATH N.TERSIGNI, SAMUEL H.MILNER, JEFFREY L.
Owner IYER RAMNATH N
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