Lubricating oil composition, method for producing lubricating oil composition, and continuously variable transmission

Patent metadata

Field	Value
Publication number	US-11208606-B2
Application number	US-201916979314-A
Country	US
Kind code	B2
Filing date	Feb 28, 2019
Priority date	Mar 13, 2018
Publication date	Dec 28, 2021
Grant date	Dec 28, 2021

Abstract

To provide a lubricating oil composition achieving both of high traction coefficient and excellent low temperature fluidity at a higher level and having a high flash point, which contains a naphthene-based synthetic oil (A) having a flash point of 140° C. or higher, a longifolene (B), and a predetermined monoester-based synthetic oil (C), a method for producing the lubricating oil composition, and a continuously variable transmission using the lubricating oil composition.

First claim

The invention claimed is:

1. A lubricating oil composition comprising a naphthene-based synthetic oil (A) having a flash point of 140° C. or higher, a longifolene (B), and a monoester-based synthetic oil (C) represented by the following general formula (1):

wherein R 11 and R 12 each independently represent a branched hydrocarbon group having 3 or more carbon atoms and
wherein the content of the naphthene-based synthetic oil (A) based on the total amount of the composition is 20% by mass or more and 45% by mass or less.

2. The lubricating oil composition according to claim 1 , wherein the naphthene-based synthetic oil (A) is a synthetic oil having at least one ring selected from a cyclohexane ring, a bicycloheptane ring, and a bicyclooctane ring.

3. The lubricating oil composition according to claim 1 , wherein the naphthene-based synthetic oil (A) is a synthetic oil represented by the following general formula (2):
R 21 p 21 —X 21 —R 22 —X 22 —R 23 p 22   (2)

wherein R 21 and R 23 each independently represent a hydrocarbon group, R 22 represents a hydrocarbon group, X 21 and X 22 each independently represent a cyclohexane ring, a bicycloheptane ring, or a bicyclooctane ring, and p 21 and p 22 each independently represent an integer of 1 or more and 6 or less.

4. The lubricating oil composition according to claim 3 , wherein in the general formula (2), X 21 and X 22 are each independently a cyclohexane ring, a bicyclo[2.2.1]heptane ring, a bicyclo[3.2.1]octane ring, or a bicyclo[2.2.2]octane ring.

5. The lubricating oil composition according to claim 3 , wherein in the general formula (2), R 21 and R 23 each independently represent an alkyl group or an alkenyl group, and R 22 represents an alkylene group or an alkenylene group.

6. The lubricating oil composition according to claim 3 , wherein in the general formula (2), R 21 and R 23 each independently represent an alkyl group having 1 to 4 carbon atoms, R 22 represents an alkylene group having 1 to 4 carbon atoms, and p 21 and p 22 each independently represent 1 or 2.

7. The lubricating oil composition according to claim 3 , wherein in the general formula (2), R 21 and R 23 each independently represent an alkyl group having 1 to 2 carbon atoms, R 22 represents an alkylene group having 1 to 2 carbon atoms, X 21 and X 22 are a bicyclo[2.2.1]heptane ring, and p 21 and p 22 each independently represent 1 or 2.

8. The lubricating oil composition according to claim 1 , wherein in the general formula (1), R 11 and R 12 each independently represent a branched alkyl group or alkenyl group having 4 to 16 carbon atoms.

9. The lubricating oil composition according to claim 1 , wherein in the general formula (1), R 11 and R 12 each independently represent a branched alkyl group having 3 to 16 carbon atoms and having a gem-dialkyl structure.

10. The lubricating oil composition according to claim 1 , wherein the content of the longifolene (B) based on the total amount of the composition is 15% by mass or more and 45% by mass or less, and the content of the monoester-based synthetic oil (C) based on the total amount of the composition is 10% by mass or more and 40% by mass or less.

11. The lubricating oil composition according to claim 1 , wherein the lubricating oil composition has a Brookfield viscosity at −40° C., measured in accordance with ASTM D2983-09, of 3,000 mPa·s or less.

12. The lubricating oil composition according to claim 1 , wherein the lubricating oil composition has a flash point as measured by Cleveland open-cup method in accordance with MS K2265-4:2007, of 130° C. or higher.

13. The lubricating oil composition according to claim 1 , which is used in a continuously variable transmission.

14. A method for producing a lubricating oil composition, comprising blending a naphthene-based synthetic oil (A) having a flash point of 140° C. or higher, a longifolene (B), and a monoester-based synthetic oil (C) represented by the following general formula (1):

wherein R 11 and R 12 each independently represent a branched hydrocarbon group having 3 or more carbon atoms, and
wherein in the composition, the content of the naphthene-based synthetic oil (A) based on the total amount of the composition is 20% by mass or more and 45% by mass or less.

15. A continuously variable transmission comprising a lubricating oil composition containing a naphthene-based synthetic oil (A) having a flash point of 140° C. or higher, a longifolene (B), and a monoester-based synthetic oil (C) represented by the following general formula (1):

wherein R 11 and R 12 each independently represent a branched hydrocarbon group having 3 or more carbon atoms, and
wherein in the composition, the content of the naphthene-based synthetic oil (A) based on the total amount of the composition is 20% by mass or more and 45% by mass or less.

Assignees

• Idemitsu Kosan Co

Inventors

• Sunagawa Yoji
• Iwasaki Takeshi

Classifications

• C10N2020/071

  Branched chain compounds · CPC title

• C10N2030/06

  Oiliness; Film-strength; Anti-wear; Resistance to extreme pressure · CPC title

• C10N2020/02

  Viscosity; Viscosity index · CPC title

• C10N2020/067

  Unsaturated Compounds · CPC title

• C10M2203/106

  Naphthenic fractions · CPC title