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US 11,111,453 B2Granted
Method for lubricating internal combustion engine
AssigneeEneos Corporation
InventorShigeki Takeshima
Life of this patent
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Abstract
A method for lubricating an internal combustion engine, the method including: supplying a lubricating oil composition to a cylinder of an internal combustion engine, wherein the internal combustion engine has a mean effective pressure of no less than 1.3 MPa, wherein an integrated intensity ratio of peaks of CaO in a X-ray diffraction spectrum of an ash is no more than 16.5%, the ash being obtained by incinerating the lubricating oil composition in an air at 950° C.
Claims19
A cylinder lubricating oil composition for a premix combustion crosshead diesel engine, the lubricating oil composition comprising:
- a mineral base oil or a synthetic base oil or a mixture thereof, as a lubricant base oil;
- and
- (A) a metallic detergent, the component (A) comprising:
- (A1) a calcium borate-overbased metallic detergent in an amount of 0.35 to 1.70 mass % in terms of calcium on the basis of the total mass of the composition, the component (A1) comprising a calcium borate-overbased calcium salicylate detergent, or a calcium borate-overbased calcium sulfonate detergent, or any combination thereof;
- and
- (A2) a calcium carbonate-overbased metallic detergent in an amount of 0.35 to 1.30 mass % in terms of calcium on the basis of the total mass of the composition, the component (A2) comprising a calcium carbonate-overbased calcium salicylate detergent, or a calcium carbonate-overbased calcium sulfonate detergent, or any combination thereof,
- wherein an integrated intensity ratio of peaks of CaO in a X-ray diffraction spectrum of an ash is no more than 16.5%, the ash being obtained by incinerating the lubricating oil composition in an air at 950° C.;
- a molar ratio B/Ca of a boron content B (unit:
- mol) of the lubricating oil composition derived from the component (A) and a calcium content Ca (unit:
- mol) of the lubricating oil composition derived from the component (A) is no less than 0.52;
- and
- the lubricating oil composition is used to lubricate at least a cylinder in a premix combustion crosshead diesel engine, wherein the premix combustion crosshead diesel engine uses a main fuel having a flash point of no more than 15° C.
9 more elements
A lubricating oil composition for a premix combustion middle-speed trunk piston diesel engine, the lubricating oil composition comprising:
- a mineral base oil or a synthetic base oil or a mixture thereof, as a lubricant base oil;
- and
- (A) a metallic detergent, the component (A) comprising:
- (A1) a calcium borate-overbased metallic detergent in an amount of 0.25 to 1.20 mass % in terms of calcium on the basis of the total mass of the composition, the component (A1) comprising a calcium borate-overbased calcium salicylate detergent, or a calcium borate-overbased calcium sulfonate detergent, or any combination thereof;
- and
- (A2) a calcium carbonate-overbased metallic detergent in an amount of 0.25 to 0.90 mass % in terms of calcium on the basis of the total mass of the composition, the component (A2) comprising a calcium carbonate-overbased calcium salicylate detergent, or a calcium carbonate-overbased calcium sulfonate detergent, or any combination thereof,
- wherein an integrated intensity ratio of peaks of CaO in a X-ray diffraction spectrum of an ash is no more than 16.5%, the ash being obtained by incinerating the lubricating oil composition in an air at 950° C.;
- a molar ratio B/Ca of a boron content B (unit:
- mol) of the lubricating oil composition derived from the component (A) and a calcium content Ca (unit:
- mol) of the lubricating oil composition derived from the component (A) is no less than 0.52;
- and
- the lubricating oil composition is used to lubricate at least a cylinder in a premix combustion middle-speed trunk piston diesel engine, wherein the premix combustion middle-speed trunk piston diesel engine uses a main fuel having a flash point of no more than 15° C.
9 more elements
A lubricating oil composition for a turbocharged gasoline engine, the lubricating oil composition comprising:
- a mineral base oil or a synthetic base oil or a mixture thereof, as a lubricant base oil;
- and
- (A) a metallic detergent, the component (A) comprising:
- (A1) a calcium borate-overbased metallic detergent in an amount of 0.10 to 0.28 mass % in terms of calcium on the basis of the total mass of the composition, the component (A1) comprising a calcium borate-overbased calcium salicylate detergent, or a calcium borate-overbased calcium sulfonate detergent, or any combination thereof;
- and
- (A2) a calcium carbonate-overbased metallic detergent in an amount of 0.10 to 0.18 mass % in terms of calcium on the basis of the total mass of the composition, the component (A2) comprising a calcium carbonate-overbased calcium salicylate detergent, or a calcium carbonate-overbased calcium sulfonate detergent, or any combination thereof,
- wherein an integrated intensity ratio of peaks of CaO in a X-ray diffraction spectrum of an ash is no more than 16.5%, the ash being obtained by incinerating the lubricating oil composition in an air at 950° C.;
- a molar ratio B/Ca of a boron content B (unit:
- mol) of the lubricating oil composition derived from the component (A) and a calcium content Ca (unit:
- mol) of the lubricating oil composition derived from the component (A) is no less than 0.52;
- and
- the lubricating oil composition is used to lubricate at least a cylinder in a turbocharged gasoline engine.
9 more elements
Dependencies are inferred from the claim text.