Lubricating oil composition, lubrication method, and transmission

Abstract

Provided is a lubricating oil composition containing, as component (A), a base oil having a kinematic viscosity at 40 °C of 3,000 mm2 / s to 20,000 mm2 / s, and containing, as component (B), a base oil having a kinematic viscosity at 40 °C of 100,000 mm2 / s to 2000,000 mm2 / s, wherein the flash point of the component (A) is at least 180 °C, the content of the component (B) is 0.01 mass% to 2.00 mass% with respect to the total amount of the lubricating oil composition, and the lubricating oil composition satisfies high levels of: fuel-efficiency due to a low viscosity and a low transition coefficient; wear resistance; usability due to a high flash point; and low-temperature fluidity. Also provided are: a lubrication method using the same; and a transmission comprising the same.

Claims

1. (A) Component has a kinematic viscosity of 3,000 mm at 40°C. ２ / s or more 20.000mm ２ A base oil with a viscosity of 100,000 mm² or less, and as component (B), with a kinematic viscosity of 100,000 mm² at 40°C. ２ / s or more 2000.000mm ２ It contains a base oil of 1 / s or less, the flash point of component (A) is 180°C or higher, and the content of component (B) is 0.01% by mass or more and 2.00% by mass or less on a total basis of the lubricating oil composition. The above component (A) is mineral oil, A lubricating oil composition in which component (B) is at least one synthetic oil selected from poly-α-olefins and ester-based base oils.

2. The lubricating oil composition according to claim 1, wherein the total content of component (A) and component (B) is 70.00% by mass or more on a basis of the total amount of the lubricating oil composition.

3. The %C of component (A) Ｐ The lubricating oil composition according to claim 1 or 2, wherein the content is 84% ​​or more.

4. The lubricating oil composition according to claim 1 or 2, wherein the mass-average molecular weight of the poly-α-olefin is 5,000 or more and 100,000 or less.

5. The lubricating oil composition according to claim 1 or 2, wherein the mass-average molecular weight of the ester-based oil is 5,000 or more and 60,000 or less.

6. Furthermore, the lubricating oil composition according to claim 1 or 2 further contains an anti-wear agent as component (C).

7. The lubricating oil composition according to claim 6, wherein the (C) component is at least one selected from acidic phosphate esters and neutral phosphate esters, and the content of total phosphorus atoms contained in the lubricating oil composition on a basis of the total amount of the lubricating oil composition is 10.0 ppm by mass or more and 1000.0 ppm by mass or less.

8. Furthermore, the lubricating oil composition according to claim 1 or 2 further contains a friction modifier as component (D).

9. The lubricating oil composition according to claim 8, wherein the (D) component is at least one selected from amide-based friction modifiers and ester-based friction modifiers.

10. The lubricating oil composition according to claim 8, wherein the total content of component (B) and component (D) is 0.01% by mass or more and 5.00% by mass or less on a basis of the total amount of the lubricating oil composition.

11. The content C of the component (B) based on the total amount of the lubricating oil composition Ｂ (mass%) and the content C of the component (D) based on the total amount of the lubricating oil composition Ｄ (mass%), and the value of the ratio (C Ｂ / C Ｄ ) is 0.50 or more and 20.00 or less. The lubricating oil composition according to claim 8

12. A lubricating oil composition according to claim 1 or 2, for use in a transmission.

13. A lubrication method using the lubricating oil composition according to claim 1 or 2.

14. A transmission comprising the lubricating oil composition according to claim 1 or 2.

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