US2004176256A1PendingUtilityA1

Lubricating oil composition for transmissions

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Assignee: NIPPON OIL CORPPriority: Nov 7, 2002Filed: Nov 4, 2003Published: Sep 9, 2004
Est. expiryNov 7, 2022(expired)· nominal 20-yr term from priority
Inventors:Osamu KurosawaShigeki MatsuiEitaro MoritaKazuo YamamoriHiroyuki Arai
C10M 169/04
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Claims

Abstract

Lubricating oil compositions for transmissions comprise (A) a mineral lubricating oil having a kinematic viscosity of from 2.3 to 3.4 mm 2 /s and a % Cp of 70 or higher defined by ASTM D 3238, as a base oil, (B) a phosphorus compound in an amount of from 0.025 to 0.05 percent by mass in terms of phosphorus based on the total mass of the composition, and (C) a viscosity index improver in such an amount that the composition has a kinematic viscosity of from 5.0 to 6.0 mm 2 /s, sulfur being contained in an amount of 0.15 percent by mass or less in the composition. The lubricating oil compositions are excellent in fuel efficiency and capable of improving the durabilities of gears and clutches, leading to long lasting gear change characteristics.

Claims

exact text as granted — not AI-modified
What is claimed is:  
     
         1 . A lubricating oil composition for transmissions which comprises (A) a mineral lubricating oil having a kinematic viscosity of from 2.3 to 3.4 mm 2 /s and a % Cp of 70 or higher defined by ASTM D 3238, as a base oil, (B) a phosphorus compound in an amount of from 0.025 to 0.05 percent by mass in terms of phosphorus based on the total mass of said composition, and (C) a viscosity index improver in such an amount that said composition has a kinematic viscosity of from 5.0 to 6.0 mm 2 /s, sulfur being contained in an amount of 0.15 percent by mass or less in said composition.  
     
     
         2 . The lubricating oil composition for transmissions according to  claim 1  which comprises (A) a mineral lubricating oil having a kinematic viscosity of from 2.5 to 3.3 mm 2 /s and a % Cp of from 74 to 82 defined by ASTM D 3238, as a base oil, (B) a phosphorus compound in an amount of from 0.03 to 0.035 percent by mass in terms of phosphorus based on the total mass of said composition, and (C) a viscosity index improver in such an amount that said composition has a kinematic viscosity of from 5.0 to 6.0 mm 2 /s, sulfur being contained in an amount of from 0.05 to 0.14 percent by mass or less in said composition.

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