Low viscosity lubricating oil composition
US-2018258365-A1 · Sep 13, 2018 · US
System oil composition for crosshead diesel engine
US9528060B2 · US · B2
| Field | Value |
|---|---|
| Publication number | US-9528060-B2 |
| Application number | US-201214347423-A |
| Country | US |
| Kind code | B2 |
| Filing date | Mar 8, 2012 |
| Priority date | Sep 27, 2011 |
| Publication date | Dec 27, 2016 |
| Grant date | Dec 27, 2016 |
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Abstract
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The present invention relates to a system oil composition for crosshead diesel engines, the system oil composition having excellent heat resistance and being effective for improvement of fuel efficiency. More specifically, the present invention relates to a system oil composition for crosshead diesel engines in which the system oil composition includes a mineral oil and/or a synthetic oil as a base oil (A) and has a kinematic viscosity of at least 35 mm 2 /s at 50° C., a high-shear viscosity of at most 45 mPa·s at 50° C., and a high-shear viscosity of at least 15 mPa·s at 70° C.
First claim
Opening claim text (preview).
The invention claimed is: 1. A system oil composition for a crosshead diesel engine, comprising a mineral base oil having a total aromatic content of 10% to 40% by mass as a base oil (A) and having a kinematic viscosity as specified by ASTM D-445 of at least 35 mm 2 /s at 50° C., a high-shear viscosity measured at 50° C. in conformity with the measurement method prescribed by ASTM D4683 of at most 45 mPa·s, and a high-shear viscosity measured at 70° C. in conformity with the measurement method prescribed by ASTM D4683 of at least 15 mPa·s. 2. The system oil composition for a crosshead diesel engine according to claim 1 , wherein the base oil (A) is a mixture of a base oil having a kinematic viscosity of greater than 15 mm 2 /s and at most 30 mm 2 /s at 100° C. and a base oil having a kinematic viscosity of greater than 3 mm 2 /s and at most 12 mm 2 /s at 100° C., and a fraction of a total base oil amount occupied by the base oil having the kinematic viscosity of greater than 15 mm 2 /s and at most 30 mm 2 /s at 100° C. is at least 7% by mass, and further comprising a viscosity index improver (B) with a PSSI of at most 30. 3. The system oil composition for a crosshead diesel engine according to claim 2 , wherein the viscosity index improver (B) is at least one selected from an olefin polymer, a star polymer having in a molecule thereof a vinyl aromatic hydrocarbon structure, and a methyl methacrylate polymer. 4. The system oil composition for a crosshead diesel engine according to claim 1 , further comprising a metallic detergent (C) and a phosphorus compound (D). 5. A method for improving efficiency of a crosshead diesel engine using the system oil composition for a crosshead diesel engine according to claim 1 . 6. The system oil composition for a crosshead diesel engine according to claim 2 , further comprising a metallic detergent (C) and a phosphorus compound (D). 7. The system oil composition for a crosshead diesel engine according to claim 3 , further comprising a metallic detergent (C) and a phosphorus compound (D). 8. A method for improving efficiency of a crosshead diesel engine using the system oil composition for a crosshead diesel engine according to claim 2 . 9. A method for improving efficiency of a crosshead diesel engine using the system oil composition for a crosshead diesel engine according to claim 3 . 10. A method for improving efficiency of a crosshead diesel engine using the system oil composition for a crosshead diesel engine according to claim 4 . 11. A method for improving efficiency of a crosshead diesel engine using the system oil composition for a crosshead diesel engine according to claim 6 . 12. A method for improving efficiency of a crosshead diesel engine using the system oil composition for a crosshead diesel engine according to claim 7 .
Assignees
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Classifications
Oiliness; Film-strength; Anti-wear; Resistance to extreme pressure · CPC title
containing aromatic monomers, e.g. styrene · CPC title
Pour-point; Viscosity index · CPC title
Metal containing thio derivatives · CPC title
Diesel engines · CPC title
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- What does patent US9528060B2 cover?
- The present invention relates to a system oil composition for crosshead diesel engines, the system oil composition having excellent heat resistance and being effective for improvement of fuel efficiency. More specifically, the present invention relates to a system oil composition for crosshead diesel engines in which the system oil composition includes a mineral oil and/or a synthetic oil as a …
- Who is the assignee on this patent?
- Takeshima Shigeki, Arimoto Naozumi, Jx Nippon Oil & Energy Corp
- What technology area does this patent fall under?
- Primary CPC classification C10M169/048. Mapped technology areas include Chemistry & Metallurgy.
- When was this patent published?
- Publication date Tue Dec 27 2016 00:00:00 GMT+0000 (Coordinated Universal Time) (B2). Legal status and post-grant events are not shown on this page.
- What related patents are in patentsdb?
- We list 8 related publications on this page (citations in our corpus or others sharing the same primary CPC).