LUBRICATING OIL COMPOSITION

• US 20090082233A1
• Filed: 05/25/2006
• Published: 03/26/2009
• Est. Priority Date: 05/27/2005
• Status: Active Grant

• Current Assignee: Idemitsu Kosan Company Limited
• Original Assignee: Idemitsu Kosan Company Limited
• Inventors: Kasai, Moritsugu
• Granted Patent: US 7,820,599 B2
• Time in Patent Office: Days
• US Class Current: 508/174
• 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 2201/08 Inorganic acids or salts thereof
• CPC Class Codes: C10M 2207/028 Overbased salts thereof
• CPC Class Codes: C10M 2215/02 Amines, e.g. polyalkylene polyamines; Quaternary amines
• 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 2219/068 Thiocarbamate metal salts
• CPC Class Codes: C10M 2223/045 Metal containing thio derivatives
• CPC Class Codes: C10N 2010/12 Groups 6 or 16
• CPC Class Codes: C10N 2030/54 Fuel economy
• CPC Class Codes: C10N 2040/04 Oil-bath; Gear-boxes; Automatic transmissions; Traction drives
• CPC Class Codes: C10N 2040/25 Internal-combustion engines
• CPC Class Codes: C10N 2060/14 by boron or a compound containing boron

Abstract

A lubricating oil composition includes lubricating oil base oil, an organic molybdenum compound (A), zinc dialkyl dithiophosphate (B), at least one compound (C) selected from calcium sulfonate, calcium phenate, and magnesium sulfonate and having a base number of 230 mgKOH/g or more, and an ashless dispersant containing boron or a mixture of an ashless dispersant containing boron and an ashless dispersant containing no boron (D) in predetermined ratios, in which: a mass ratio (P/Mo) of the P content to the Mo content in the composition is 1.5 or more; a mass ratio (CaMg/Mo) of a total content of the Ca and Mg derived from the component (C) to the Mo content in the composition is 3 or more; and a mass ratio (B/N) between B and N derived from the component (D) in the composition is 0.5 or more. The lubricating oil composition of the present invention has a high static friction coefficient of wet clutch, has excellent frictional property in a power transmission mechanism, has excellent fuel saving property, and is suitably used for power transmission lubricating oil and engine lubricating oil.

Claims

1. A lubricating oil composition comprising:

a lubricating oil base oil;

an organic molybdenum compound (A) having a Mo content of 100 to 1,000 mass ppm;

zinc dialkyl dithiophosphate (B) having a P content of 0.03 to 0.20 mass %;

at least one compound (C) selected from calcium sulfonate, calcium phenate, and magnesium sulfonate and having a base number obtained through a perchloric acid method of 230 mgKOH/g or more in a Ca and/or Mg content of 0.15 to 0.30 mass %; and

an ashless dispersant comprising boron, or a mixture of an ashless dispersant comprising boron and an ashless dispersant comprising no boron (D) in a B content of 0.03 mass % or more and an N content of 0.05 mass % or more,

wherein;

a mass ratio (P/Mo) of the P content to the Mo content in the composition is 1.5 or more;

a mass ratio (CaMg/Mo) of a total content of the Ca and Mg derived from the component (C) to the Mo content in the composition is 3 or more; and

a mass ratio (B/N) between B and N derived from the component (D) in the composition is 0.5 or more.

2. The lubricating oil composition according to claim 1, wherein:

the organic molybdenum compound as the component (A) comprises a molybdenum amine salt and molybdenum dithiocarbamate; and

a mass ratio (MoA/MoD) of an Mo content (MoA) derived from the molybdenum amine salt to an Mo content (MoD) derived from molybdenum dithiocarbamate is 3 or less.

3. The lubricating oil composition according to claim 1, wherein:

the mass ratio (B/N) between B and N derived from the component (D) is 0.5 to 1.2; and

the component (D) is included in a B content of 0.03 to 0.2 mass % and an N content of 0.05 to 0.2 mass %.

5. A power transmission lubricant comprising the lubricating oil composition according to claim 1.

6. An engine lubricant comprising the lubricating oil composition according to claim 1.

4. (canceled)