US2006264340A1PendingUtilityA1

Fluid compositions for dual clutch transmissions

37
Individually held — no corporate assignee on recordPriority: May 20, 2005Filed: May 20, 2005Published: Nov 23, 2006
Est. expiryMay 20, 2025(expired)· nominal 20-yr term from priority
Inventors:Ramnath IyerSamuel TersigniJeffrey L. Milner
C10N 2040/04C10M 141/10C10N 2030/40C10N 2030/06C10N 2060/12F16H 57/041C10N 2060/14C10M 2215/28C10M 2223/06C10M 2215/086C10M 125/26C10M 137/02C10M 125/24
37
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Claims

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.

Claims

exact text as granted — not AI-modified
1 . A method of lubricating a dual clutch transmission with a lubricating fluid comprising the step of lubricating a dual clutch transmission with a substantially zinc-free lubricating fluid comprising: 
 (a) an ashless dispersant;    (b) a friction modifier;    (c) a phosphonate; and    (d) a base oil.    
     
     
         2 . The method of  claim 1 , wherein the base oil comprises a natural lubricating oil, a mixture of natural lubricating oils, a synthetic oil, a mixture of synthetic oils, or a mixture of natural and synthetic oils.  
     
     
         3 . The method of  claim 1 , wherein the dispersant comprises boron.  
     
     
         4 . The method of  claim 3 , wherein the boron-containing dispersant comprises from about 0.1 wt % to about 0.7 wt % of boron.  
     
     
         5 . The method of  claim 1 , wherein the dispersant comprises phosphorous.  
     
     
         6 . The method of  claim 1 , wherein the dispersant comprises phosphorous and boron.  
     
     
         7 . The method of  claim 6 , wherein the dispersant comprises up to about 400 ppm total phosphorous and boron.  
     
     
         8 . The method of  claim 1 , wherein the phosphonate is selected from the group consisting of phosphonates having the formula:  
       
         
           
           
               
               
           
         
       
       wherein R 1  is an alkyl or alkenyl group containing about 12 to about 30 carbon atoms and wherein R 2  and R 3  are each independently hydrogen, an alkyl, or an alkenyl group.  
     
     
         9 . The method of  claim 8 , wherein the phosphonate is selected from the group consisting of dimethyl triacontylphosphonate, dimethyl triacontenylphosphonate, dimethyl eicosylphosphonate, dimethyl hexadecylphosphonate, dimethyl hexadecenylphosphonate, dimethyl tetracontenylphosphonate, dimethyl hexacontylphosphonate, dimethyl dodecylphosphonate, dimethyl dodecenylphosphonate, dimethyl hexadecylphosphonate, dimethyl hexadecenylphosphonate, dimethyl octadecylphosphonate, dimethyl octadecenylphosphonate, and dimethyl eicosylphosphonate.  
     
     
         10 . The method of  claim 8 , wherein the phosphonate is selected from the group consisting of phosphonates wherein R 1  is an alkyl or alkenyl group containing about 16-20 carbon atoms.  
     
     
         11 . The method of  claim 8 , wherein the phosphonate comprises dimethyl octadecylphosphonate  
     
     
         12 . The method of  claim 1 , wherein the lubricating composition comprises from about 0.05 to about 3 wt % of the phosphonate, based on the total weight of the lubricating composition.  
     
     
         13 . The method of  claim 1 , wherein the shifting of gears in the dual clutch transmission comprises synchronization of an engaged and a non-engaged partial transmission shaft.  
     
     
         14 . The method of  claim 1 , wherein the lubricating fluid further comprises at least one sulfur-containing compound.  
     
     
         15 . A dual clutch transmission fluid comprising: 
 (a) an ashless dispersant;    (b) a friction modifier;    (c) a phosphonate; and    (d) a base oil,    wherein the dual clutch transmission fluid is substantially zinc-free.    
     
     
         16 . The transmission fluid of  claim 15 , wherein the base oil comprises a natural lubricating oil, a mixture of natural lubricating oils, a synthetic oil, a mixture of synthetic oils, or a mixture of natural and synthetic oils.  
     
     
         17 . The transmission fluid of  claim 15 , wherein the dispersant comprises boron.  
     
     
         18 . The transmission fluid of  claim 17 , wherein the boron-containing dispersant comprises from about 0.1 wt % to about 0.7 wt % of boron.  
     
     
         19 . The transmission fluid of  claim 15 , wherein the dispersant comprises phosphorous.  
     
     
         20 . The transmission fluid of  claim 15 , wherein the dispersant comprises phosphorous and boron.  
     
     
         21 . The transmission fluid of  claim 20 , wherein the dispersant comprises up to about 400 ppm total phosphorous and boron.  
     
     
         22 . The transmission fluid of  claim 15 , wherein the phosphonate is selected from the group consisting of phosphonates having the formula:  
       
         
           
           
               
               
           
         
       
       wherein R 1  is an alkyl or alkenyl group containing about 12 to about 30 carbon atoms and wherein R 2  and R 3  are each independently hydrogen, an alkyl, or an alkenyl group.  
     
     
         23 . The transmission fluid of  claim 22 , wherein the phosphonate is selected from the group consisting of dimethyl triacontylphosphonate, dimethyl triacontenylphosphonate, dimethyl eicosylphosphonate, dimethyl hexadecylphosphonate, dimethyl hexadecenylphosphonate, dimethyl tetracontenylphosphonate, dimethyl hexacontylphosphonate, dimethyl dodecylphosphonate, dimethyl dodecenylphosphonate, dimethyl hexadecylphosphonate, dimethyl hexadecenylphosphonate, dimethyl octadecylphosphonate, dimethyl octadecenylphosphonate, and dimethyl eicosylphosphonate.  
     
     
         24 . The transmission fluid of  claim 22 , wherein the phosphonate is selected from the group consisting of phosphonates wherein R 1  is an alkyl or alkenyl group containing about 16-20 carbon atoms.  
     
     
         25 . The transmission fluid of  claim 22 , wherein the phosphonate comprises dimethyl octadecylphosphonate  
     
     
         26 . The transmission fluid of  claim 15 , wherein the lubricating composition comprises from about 0.05 to about 3 wt % of the phosphonate, based on the total weight of the lubricating composition.  
     
     
         27 . The transmission fluid of  claim 15 , wherein the lubricating composition further comprising at least one sulfur-containing compound.

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