METHODS FOR IMPROVED POWER TRANSMISSION PERFORMANCE

• US 20070000745A1
• Filed: 06/22/2006
• Published: 01/04/2007
• Est. Priority Date: 06/30/2005
• Status: Abandoned Application

• Current Assignee: Afton Chemical Corporation
• Original Assignee: Afton Chemical Corporation
• Inventors: Jao, Tze-Chi, Iyer, Ramnath, Cameron, Timothy
• Application Number:
  US11/425,801
• Publication Number:
  US 20070000745A1
• Time in Patent Office: Days
• US Class Current: 192/3.280
• CPC Class Codes: C10M 103/00 Lubricating compositions characterised by the base-material being an inorganic material containing more than 10% water C10M173/00
• CPC Class Codes: C10M 141/10 at least one of them being an organic phosphorus-containing compound
• CPC Class Codes: C10M 163/00 Lubricating compositions characterised by the additive being a mixture of a compound of unknown or incompletely defined constitution and a non-macromolecular compound, each of these compounds being essential
• CPC Class Codes: C10M 2207/027 Neutral salts thereof
• CPC Class Codes: C10M 2207/028 Overbased salts thereof
• CPC Class Codes: C10M 2207/26 Overbased carboxylic acid salts
• CPC Class Codes: C10M 2207/262 derived from hydroxy substituted aromatic acids, e.g. salicylates
• CPC Class Codes: C10M 2215/042 containing hydroxy groups; Alkoxylated derivatives thereof
• CPC Class Codes: C10M 2215/28 Amides; Imides
• CPC Class Codes: C10M 2219/044 Sulfonic acids, Derivatives thereof, e.g. neutral salts
• CPC Class Codes: C10M 2219/046 Overbasedsulfonic acid salts
• CPC Class Codes: C10M 2223/02 having no phosphorus-to-carbon bonds
• CPC Class Codes: C10M 2223/04 Phosphate esters
• CPC Class Codes: C10N 2030/76 Reduction of noise, shudder, or vibrations
• CPC Class Codes: C10N 2040/042 for automatic transmissions
• CPC Class Codes: C10N 2040/044 for manual transmissions
• CPC Class Codes: C10N 2040/045 for continuous variable transmission [CVT]
• CPC Class Codes: C10N 2060/12 by phosphorus or a compound containing phosphorus, e.g. PxSy
• CPC Class Codes: F16D 2500/3024 Pressure
• CPC Class Codes: F16D 2500/50293 Reduction of vibrations
• CPC Class Codes: F16D 2500/7044 : Output shaft torque
• CPC Class Codes: F16D 48/06 : Control by electric or electronic means, e.g. of fluid pressure
• CPC Class Codes: F16H 15/00 : Gearings for conveying rotary motion with variable gear ratio, or for reversing rotary motion, by friction between rotary members gearings for reversal only F16H3/14, F16H3/60 ; control of change-speed or reversing-gearings conveying rotary motion F16H59/00 - F16H63/00
• CPC Class Codes: F16H 57/04 : Features relating to lubrication or cooling or heatingin hydrokinetic gearing F16H41/30; control of lubrication or cooling in hydrostatic gearing F16H61/4165

Abstract

Advanced methods are provided for achieving improved power transmission performance, and unique fluid compositions useful for practicing such methods are also presented. In particular a method is provided for reducing NVH in a power transmission apparatus having a friction torque transfer apparatus, such as, e.g., a shifting clutch, comprising maintaining a negative ∂μ/∂T slope, and/or a negative ∂μ/∂P slope, during engagement of the friction torque transfer apparatus.

Claims

1. A method of suppressing NVH in a power transmission apparatus having a friction torque transfer apparatus comprising maintaining a negative ∂

μ

/∂

T slope during engaging, slipping or modulating thereof.

2. The method of claim 1, wherein the friction torque transfer apparatus is selected from the group consisting of a shifting clutch, a starting clutch, a torque converter clutch, a band clutch, disk or plate clutch, and a limited slip differential clutch.

3. The method of claim 1, wherein the friction torque transfer apparatus comprises a shifting clutch.

4. The method of claim 1, wherein the transmission apparatus comprises a multi-speed transmission comprising at least a four-speed or more transmission.

5. The method of claim 1, wherein the transmission apparatus comprises a multi-speed transmission comprising a five-speed automatic transmission, a six-speed automatic transmission, and a seven-speed automatic transmission.

6. The method of claim 1, wherein the transmission apparatus comprises a dual-clutch transmission.

7. The method of claim 1, wherein the transmission apparatus comprises a continuously variable transmission.

8. The method of claim 1, wherein the negative ∂

μ

/∂

T slope is maintained without reducing static or quasi-static friction at the clutch during the engagement.

9. The method of claim 1, wherein the controlled NVH includes squawk.

10. A method of suppressing NVH in a power transmission apparatus having a friction torque transfer apparatus comprising maintaining a negative ∂

μ

/∂

P slope during engaging, slipping or modulating thereof

11. A power transmission apparatus comprising a friction torque transfer apparatus having a clutch surface in contact with a transmission fluid, said transmission operable to maintain a negative ∂

μ

/∂

T slope during engaging, slipping or modulating of the friction torque transfer apparatus.

12. The power transmission apparatus of claim 11, wherein the friction torque transfer apparatus is selected from the group consisting of a shifting clutch, a starting clutch, a torque converter clutch, a band clutch, disk or plate clutch, and a limited slip differential clutch.

13. The power transmission apparatus of claim 11, wherein the friction torque transfer apparatus comprises a shifting clutch having a clutch surface in contact with a transmission fluid composition, said transmission operable to maintain a negative ∂

μ

/∂

T slope during engagement of the shifting clutch.

14. The transmission of claim 11, wherein the transmission comprises a continuously variable transmission.

15. The transmission of claim 11, wherein the transmission comprises a dual clutch transmission.

16. The transmission of claim 11, wherein the transmission comprises an automatic transmission.

17. The transmission of claim 11, wherein the transmission comprises a manual transmission.

18. The transmission of claim 11, wherein the transmission comprises one or more of an electronically controlled converter clutch, a slipping torque converter, a lock-up torque converter, a starting clutch, and one or more shifting clutches.

19. The transmission of claim 11, wherein the transmission apparatus comprises a multi-speed transmission comprising at least a four-speed or more transmission

20. The transmission of claim 11, wherein the transmission comprises a belt, chain, or disk-type continuously variable transmission, a 4-speed or more automatic transmission, a manual transmission, an automated manual transmission, or a dual clutch transmission.

21. A vehicle comprising an engine, and the transmission of claim 11.

22. The vehicle of claim 21, comprising a heavy duty bus.