Lubricating oil composition

Patent metadata

Field	Value
Publication number	US-11946012-B2
Application number	US-202017766284-A
Country	US
Kind code	B2
Filing date	Oct 23, 2020
Priority date	Oct 23, 2019
Publication date	Apr 2, 2024
Grant date	Apr 2, 2024

Abstract

The purpose of the present invention is to provide a lubricating oil composition capable of achieving good wear resistance and good scoring resistance of a bearing in addition to further fuel saving while maintaining durability and seizure resistance that can be used as a gear oil for a high-output, high-speed gear mechanism. A lubricating oil composition containing a combination of Fischer-Tropsch derived base oil having a low kinematic viscosity at high temperature, polyalphaolefin having a high kinematic viscosity at high temperature, and ester compound of a trivalent or higher polyol having a low kinematic viscosity at high temperature, and further contains a partial ester compound of an unsaturated fatty acid and a polyol, including a monoester compound of the unsaturated fatty acid and the polyol.

First claim

We claim:

1. A lubricating oil composition comprising
(A-1) a Fischer-Tropsch derived base oil with a kinematic viscosity at 100° C. of 2 to 3.5 mm 2 /s,
(A-2) a polyalphaolefin with a kinematic viscosity at 100° C. of 400 to 700 mm 2 /s,
(A-3) a complete ester compound that is an ester of a trihydric or higher polyol with a kinematic viscosity at 100° C. of 3 to 6 mm 2 /s, and
(B-1) a partial ester compound of an unsaturated fatty acid and a polyol, wherein the partial ester compound of the unsaturated fatty acid and the polyol is a monoester of an unsaturated fatty acid and glycerol,
wherein the unsaturated fatty acid in (B-1) is an unsaturated fatty acid having from 10 to 20 carbon atoms, and the lubricating oil composition has a kinematic viscosity at 40° C. of 25 mm 2 /s to 45 mm 2 /s,
wherein the lubricating oil composition comprises the Fischer-Tropsch derived base oil (A-1) in an amount from 30 to 80 mass % based on the total mass of the composition, the polyalphaolefin (A-2) in an amount from 5 to 40 mass % based on the total mass of the composition, and the ester compound (A-3) in an amount from 5 to 20 mass % based on the total mass of the composition, and
wherein the lubricating oil composition comprises the partial ester compound of the unsaturated fatty acid (B-1) in an amount from 0.2 to 2 mass % based on the total mass of the composition.

2. A lubricating oil composition according to claim 1 , wherein the ester compound (A-3) is an ester of a trihydric or tetravalent polyol and a saturated fatty acid.

3. A lubricating oil composition according to claim 2 , wherein the ester compound (A-3) is an ester compound of trimethylolpropane and linear saturated carboxylic acids having 8 and 10 carbon atoms.

4. A lubricating oil composition according to claim 1 , wherein the lubricating oil composition is used as a GL-5 automotive hypoid gear oil.

Assignees

• Toyota Motor Co Ltd
• Shell Lubricants Japan Kk
• Shell Usa Inc

Inventors

• Shinoda Noriaki
• Saitou Shinji
• Kishi Misato
• Shibata Shin-Ichiro
• Ogawa Masashi

Classifications

• C10M105/38 Primary

  of polyhydroxy compounds · CPC title

• C10M105/24

  having only one carboxyl group bound to an acyclic carbon atom, cycloaliphatic carbon atom or hydrogen · CPC title

• C10M105/34

  of monocarboxylic acids · CPC title

• C10M107/04

  Polyethylene · CPC title

• C10M107/06

  containing propene · CPC title