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US-12618019-B2 - Lubricating oil composition for two-wheeled vehicle

US12618019B2US 12618019 B2US12618019 B2US 12618019B2US-12618019-B2

Abstract

Provided is a lubricating oil composition for a two-wheeled vehicle, containing a base oil, (A) a zinc dialkyldithiophosphate, and (B) a molybdenum-based friction modifier, in which a mass ratio (P/Mo) of a content of a phosphorus atom derived from the zinc dialkyldithiophosphate (A) to a content of a molybdenum atom derived from the molybdenum-based friction modifier (B) is 0.8 or more and less than 2.0, and a kinematic viscosity at 100° C. is 5.0 to 7.1 mm 2 /s, the lubricating oil composition for a two-wheeled vehicle by which excellent fuel efficiency is achieved.

Inventors

  • Naoto HORITA

Assignees

  • IDEMITSU KOSAN CO., LTD.

Dates

Publication Date
20260505
Application Date
20230208
Priority Date
20220331

Claims (20)

  1. 1 . A lubricating oil composition for a two-wheeled vehicle, comprising: a base oil; a zinc dialkyldithiophosphate; and a molybdenum-based friction modifier, wherein a mass ratio of a content of a phosphorus atom derived from the zinc dialkyldithiophosphate to a content of a molybdenum atom derived from the molybdenum-based friction modifier is 0.8 or more and less than 2.0, and a kinematic viscosity of the lubricating oil composition at 100° C. is in a range of 5.0 to 7.1 mm 2 /s.
  2. 2 . The lubricating oil composition for a two-wheeled vehicle according to claim 1 , wherein the zinc dialkyldithiophosphate has a secondary alkyl group.
  3. 3 . The lubricating oil composition for a two-wheeled vehicle according to claim 1 , wherein the content of a phosphorus atom derived from the zinc dialkyldithiophosphate is in a range of 600 to 900 ppm by mass.
  4. 4 . The lubricating oil composition for a two-wheeled vehicle according to claim 1 , wherein the content of a molybdenum atom derived from the molybdenum-based friction modifier is in a range of 400 to 800 ppm by mass.
  5. 5 . The lubricating oil composition for a two-wheeled vehicle according to claim 1 , wherein a content of a sulfur atom derived from the zinc dialkyldithiophosphate is in a range of 0.12 to 0.22% by mass.
  6. 6 . The lubricating oil composition for a two-wheeled vehicle according to claim 1 , wherein a kinematic viscosity of the base oil at 40° C. is in a range of 18.0 to 24.0 mm 2 /s.
  7. 7 . A method of lubricating a two-wheeled vehicle, comprising: applying the lubricating oil composition of claim 1 to a roller bearing of an engine in a two-wheeled vehicle.
  8. 8 . The lubricating oil composition for a two-wheeled vehicle according to claim 2 , wherein the content of a phosphorus atom derived from the zinc dialkyldithiophosphate is in a range of 600 to 900 ppm by mass.
  9. 9 . The lubricating oil composition for a two-wheeled vehicle according to claim 2 , wherein the content of a molybdenum atom derived from the molybdenum-based friction modifier is in a range of 400 to 800 ppm by mass.
  10. 10 . The lubricating oil composition for a two-wheeled vehicle according to claim 2 , wherein a content of a sulfur atom derived from the zinc dialkyldithiophosphate is in a range of 0.12 to 0.22% by mass.
  11. 11 . The lubricating oil composition for a two-wheeled vehicle according to claim 2 , wherein a kinematic viscosity of the base oil at 40° C. is in a range of 18.0 to 24.0 mm 2 /s.
  12. 12 . The lubricating oil composition for a two-wheeled vehicle according to claim 3 , wherein the content of a molybdenum atom derived from the molybdenum-based friction modifier is in a range of 400 to 800 ppm by mass.
  13. 13 . The lubricating oil composition for a two-wheeled vehicle according to claim 3 , wherein a content of a sulfur atom derived from the zinc dialkyldithiophosphate is in a range of 0.12 to 0.22% by mass.
  14. 14 . The lubricating oil composition for a two-wheeled vehicle according to claim 3 , wherein a kinematic viscosity of the base oil at 40° C. is in a range of 18.0 to 24.0 mm 2 /s.
  15. 15 . The lubricating oil composition for a two-wheeled vehicle according to claim 4 , wherein a content of a sulfur atom derived from the zinc dialkyldithiophosphate is in a range of 0.12 to 0.22% by mass.
  16. 16 . The lubricating oil composition for a two-wheeled vehicle according to claim 4 , wherein a kinematic viscosity of the base oil at 40° C. is in a range of 18.0 to 24.0 mm 2 /s.
  17. 17 . The lubricating oil composition for a two-wheeled vehicle according to claim 5 , wherein a kinematic viscosity of the base oil at 40° C. is in a range of 18.0 to 24.0 mm 2 /s.
  18. 18 . The lubricating oil composition for a two-wheeled vehicle according to claim 8 , wherein a content of a sulfur atom derived from the zinc dialkyldithiophosphate is in a range of 0.12 to 0.22% by mass.
  19. 19 . The lubricating oil composition for a two-wheeled vehicle according to claim 8 , wherein a kinematic viscosity of the base oil at 40° C. is in a range of 18.0 to 24.0 mm 2 /s.
  20. 20 . The lubricating oil composition for a two-wheeled vehicle according to claim 18 , wherein a kinematic viscosity of the base oil at 40° C. is in a range of 18.0 to 24.0 mm 2 /s.

Description

CROSS-REFERENCE TO RELATED APPLICATIONS This application is a national stage application of International Application No. PCT/JP2023/004072, filed Feb. 8, 2023, which is based upon and claims the benefit of priority to Japanese Patent Application No. 2022-061224, filed Mar. 31, 2022. The entire contents of these applications are incorporated herein by reference. TECHNICAL FIELD The present invention relates to a lubricating oil composition for a two-wheeled vehicle. BACKGROUND ART In recent years, for a reduction in environmental loads, vehicles such as an automobile are required to have enhanced fuel efficiency. As a method for enhancing fuel efficiency, a method using a lubricating oil composition containing a zinc dialkyldithiophosphate or an organic molybdenum compound has been known (e.g., see PTL 1). CITATION LIST Patent Literature PTL 1: JP 2006-328265 A SUMMARY OF INVENTION Technical Problem However, in PTL 1, a study on the ratio between the content of a zinc dialkyldithiophosphate and the content of an organic molybdenum compound is not necessarily sufficient from the viewpoint of fuel efficiency. The present invention has been made in view of the problem described above, and an object of the present invention is to provide a lubricating oil composition for a two-wheeled vehicle having excellent fuel efficiency. Solution to Problem The inventors of the present invention have found that the problem can be solved by a lubricating oil composition for a two-wheeled vehicle in which the mass ratio (P/Mo) of the content of a phosphorus atom derived from (A) a zinc dialkyldithiophosphate to the content of a molybdenum atom derived from (B) a molybdenum-based friction modifier is 0.8 or more and less than 2.0 and the kinematic viscosity at 100° C. is 5.0 to 7.1 mm2/s, and completed the present invention. Specifically, the present invention provides the following [1] to [7]. [1] A lubricating oil composition for a two-wheeled vehicle, containing a base oil, (A) a zinc dialkyldithiophosphate, and (B) a molybdenum-based friction modifier, in which a mass ratio (P/Mo) of a content of a phosphorus atom derived from the zinc dialkyldithiophosphate (A) to a content of a molybdenum atom derived from the molybdenum-based friction modifier (B) is 0.8 or more and less than 2.0, and a kinematic viscosity at 100° C. is 5.0 to 7.1 mm2/s.[2] The lubricating oil composition for a two-wheeled vehicle according to [1], in which the zinc dialkyldithiophosphate (A) has a secondary alkyl group.[3] The lubricating oil composition for a two-wheeled vehicle according to [1] or [2], in which the content of a phosphorus atom derived from the zinc dialkyldithiophosphate (A) is 600 to 900 ppm by mass % by mass.[4] The lubricating oil composition for a two-wheeled vehicle according to any one of [1] to [3], in which the content of a molybdenum atom derived from the molybdenum-based friction modifier (B) is 400 to 800 ppm by mass.[5] The lubricating oil composition for a two-wheeled vehicle according to any one of [1] to [4], in which a content of a sulfur atom derived from the zinc dialkyldithiophosphate (A) is 0.12 to 0.22% by mass.[6] The lubricating oil composition for a two-wheeled vehicle according to any one of [1] to [5], in which a kinematic viscosity at 40° C. of the base oil is 18.0 to 24.0 mm2/s.[7] The lubricating oil composition for a two-wheeled vehicle according to any one of [1] to [6], in which the lubricating oil composition is used for a two-wheeled vehicle having an engine with a roller bearing. Advantageous Effects of Invention The present invention can provide a lubricating oil composition for a two-wheeled vehicle having excellent fuel efficiency (hereinafter also referred to as “lubricating oil composition”). DESCRIPTION OF EMBODIMENTS In this description, the lower limit values and the upper limit values described in a stepwise manner in a preferred numerical range (for example, ranges of a content, and the like) can be each independently combined. For example, the expression “preferably 10 to 90, more preferably 30 to 60” can mean “10 to 60” by combining “a preferable lower limit value (10)” and “a more preferable upper limit value (60)”. Similarly, in this description, a numerical value “or more”, a numerical value “or less”, “less than” a numerical value, and “more than” a numerical value, which relate to a numerical range, are values that can be optionally combined. Base Oil As a base oil used in the present embodiment, a mineral oil and a synthetic oil are used. <Mineral Oil and Synthetic Oil> The base oil may include one or more types selected from a mineral oil and a synthetic oil, or may include a mineral oil and a synthetic oil. Examples of the mineral oil include atmospheric residue obtained by atmospheric distillation of crude oil such as a paraffinic crude oil, an intermediate base crude oil, and a naphthenic crude oil; distillate oils obtained by vacuum distillation of the atmospheric residue; an