US2014011724A1PendingUtilityA1

Lubricating oil composition

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Assignee: ONUMATA YASUSHIPriority: Mar 25, 2011Filed: Sep 13, 2011Published: Jan 9, 2014
Est. expiryMar 25, 2031(~4.7 yrs left)· nominal 20-yr term from priority
Inventors:Yasushi OnumataNoriko Abe
C10N 2040/045C10N 2040/042C10N 2020/04C10N 2060/14C10N 2030/06C10M 169/041C10N 2030/68C10M 2229/02C10N 2030/02C10N 2040/04C10M 2203/1025C10M 145/14C10N 2030/54C10M 2209/084C10N 2020/02C10N 2040/044C10N 2020/017C10M 169/04C10N 2010/04C10M 2223/04
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Claims

Abstract

A lubricating oil composition which exceeds the fuel saving performance of a conventional low viscosity lubricating oil composition, contains (A) a lubricating base oil having a % C A of 2 or less, adjusted to a 100° C. kinematic viscosity of 1.5 to 4.5 mm 2 /s and (B) a viscosity index improver including (B1) a poly(meth)acrylate having a weight-average molecular weight of 50,000 or less in an amount of 1 to 10 percent by mass and (B2) a poly(meth)acrylate having a weight-average molecular weight of 100,000 to 250,000 in an amount of 0.1 to 5 percent by mass of the total composition. The composition has a 80° C. high-shear viscosity (Vs: mPa·s) and a 80° C. kinematic viscosity (Vk: mm 2 /s) ratio (Vs/Vk) of less than 1, a coefficient of traction of 0.02 or less at 40° C., an average speed of 3.0 m/s, a slip ratio of 10%, and a contact pressure of 0.4 GPa.

Claims

exact text as granted — not AI-modified
1 . A lubricating oil composition comprising:
 (A) a lubricating base oil having a % C A  of 2 or less and adjusted to have a 100° C. kinematic viscosity of 1.5 to 4.5 mm 2 /s; and   (B) a viscosity index improver comprising (B1) a poly(meth)acrylate having a weight-average molecular weight of 50,000 or less in an amount of 1 to 10 percent by mass and (B2) a poly(meth)acrylate having a weight-average molecular weight of 100,000 to 250,000 in an amount of 0.1 to 5 percent by mass on the total composition mass basis, the composition having a 80° C. high-shear viscosity (Vs: mPa·s) and a 80° C. kinematic viscosity (Vk: mm 2 /s) ratio (Vs/Vk) of less than 1 and a coefficient of traction of 0.02 or less at 40° C., an average speed of 3.0 m/s, a slip ratio of 10%, and a contact pressure of 0.4 GPa.   
     
     
         2 . The lubricating oil composition according to  claim 1 , wherein the 80° C. viscosity reduction rate 8 hours after a sonic shear test is 8% or less. 
     
     
         3 . The lubricating oil composition according to  claim 1 , wherein it is used for a mechanism containing an oil pump as a structural element. 
     
     
         4 . The lubricating oil composition according to  claim 1 , wherein it is used for a continuously variable transmission. 
     
     
         5 . The lubricating oil composition according to  claim 2 , wherein it is used for a mechanism containing an oil pump as a structural element. 
     
     
         6 . The lubricating oil composition according to  claim 2 , wherein it is used for a continuously variable transmission.

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