Method for lubricating internal combustion engine

Patent metadata

Field	Value
Publication number	US-11111453-B2
Application number	US-201716341195-A
Country	US
Kind code	B2
Filing date	Oct 18, 2017
Priority date	Oct 18, 2016
Publication date	Sep 7, 2021
Grant date	Sep 7, 2021

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.

First claim

I claim:

1. 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.

2. The lubricating oil composition according to claim 1 , further comprising:
one or more selected from the group consisting of: (B) an ashless dispersant, (C) a phosphorus-containing anti-wear agent, (D) an amine antioxidant, and (E) an oil-soluble organic molybdenum compound.

3. The lubricating oil composition according to claim 1 ,
wherein the component (A1) consists of
the calcium borate-overbased calcium salicylate detergent, or
the calcium borate-overbased calcium sulfonate detergent, or
any combination thereof; and

the molar ratio B/Ca is 0.52 to 1.43.

4. The lubricating oil composition according to claim 1 ,
wherein the lubricating oil composition has a kinematic viscosity at 100° C. of 16.3 to 21.9 mm 2 /s.

5. A method for lubricating a cylinder of a premix combustion crosshead diesel engine, comprising:
a) supplying the lubricating oil composition as defined in claim 1 to a cylinder of a premix combustion crosshead diesel engine, wherein the premix combustion crosshead diesel engine has a mean effective pressure of no less than 1.3 MPa; and
b) making a main fuel ignite in the cylinder, wherein the main fuel has a flash point of no more than 15° C.

6. The method according to claim 5 ,
wherein the main fuel consists of
a C 1-4 hydrocarbon, or
dimethyl ether, or
any combination thereof.

7. The method according to claim 6 ,
wherein the b) making a main fuel ignite in the cylinder comprises:
i) compressing a fuel-air mixture of the main fuel and an air in the cylinder; and
ii) injecting a pilot fuel into the cylinder, to ignite the fuel-air mixture,

wherein the pilot fuel consists of a heavy fuel oil, a light fuel oil, or kerosene, or any combination thereof.

8. 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. The lubricating oil composition according to claim 8 , further comprising:
one or more selected from the group consisting of: (B) an ashless dispersant, (C) a phosphorus-containing anti-wear agent, (D) an amine antioxidant, and (E) an oil-soluble organic molybdenum compound.

10. The lubricating oil composition according to claim 8 ,
wherein the component (A1) consists of
the calcium borate-overbased calcium salicylate detergent, or
the calcium borate-overbased calcium sulfonate detergent, or
any combination thereof; and

the molar ratio B/Ca is 0.52 to 1.43.

11. The lubricating oil composition according to claim 8 ,
wherein the lubricating oil composition has a kinematic viscosity at 100° C. of no less than 9.3 mm 2 /s and less than 16.3 mm 2 /s.

12. A method for lubricating a premix combustion middle-speed trunk piston diesel engine, the method comprising:
a) supplying the lubricating oil composition as defined in claim 8 to a cylinder of a premix combustion middle-speed trunk piston diesel engine, wherein the premix combustion middle-speed trunk piston diesel engine has a mean effective pressure of no less than 1.3 MPa; and
b) making a main fuel ignite in the cylinder, wherein the main fuel has a flash point of no more than 15° C.

13. The method according to claim 12 ,
wherein the main fuel consists of
a C 1-4 hydrocarbon, or
dimethyl ether, or
any combination thereof.

14. The method according to claim 13 ,
wherein the b) making a main fuel ignite in the cylinder comprises:
i) compressing a fuel-air mixture of the main fuel and an air in the cylinder; and
ii) injecting a pilot fuel into the cylinder, to ignite the fuel-air mixture,

wherein the pilot fuel consists of a heavy fuel oil, a light fuel oil, or kerosene, or any combination thereof.

15. 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

Assignees

• Eneos Corp

Inventors

• Takeshima Shigeki

Classifications

• C10M171/00 Primary

  Lubricating compositions characterised by purely physical criteria, e.g. containing as base-material, thickener or additive, ingredients which are characterised exclusively by their numerically specified physical properties, i.e. containing ingredients which are physically well-defined but for which the chemical nature is either unspecified or only very vaguely indicated (chemically defined ingredients C10M101/00 - C10M169/00; petroleum fractions C10M101/02, C10M121/02, C10M159/04) · CPC title

• C10M2219/068

  Thiocarbamate metal salts · CPC title

• C10M159/20

  Reaction mixtures having an excess of neutralising base, e.g. so-called overbasic or highly basic products · CPC title

• C10M2203/1025

  used as base material · CPC title

• C10M2207/26

  Overbased carboxylic acid salts · CPC title