Electric vehicle grease
A lubricating grease for electric vehicle applications includes thickener 6% by weight (wt. %) to 12 wt. %, lubricating oil 57 wt. % to 92.98 wt. %, and surface-active ester 1 wt. % to 10 wt. %. The lubricating grease also includes additives including friction reducer and modifier 0.1 wt. % to 5 wt. %, anti-wear agent 0.1 wt. % to 5 wt. %, and a balance of extreme pressure agent, oxidation inhibitor, and corrosion inhibitor.
1. A lubricating grease for electric vehicle applications comprising:
a thickener in a range of 6% by weight (wt. %) to 12 wt. %;
a lubricating oil consisting of synthetic oil selected from API (American Petroleum Institute) groups III and IV in a range of 57 wt. % to 92.98 wt. %;
a surface-active ester in a range of 8 wt. % to 10 wt. %, the surface-active ester comprising a synthetic copolymer of alpha-olefins and dicarboxylic acids esterified with short to medium chain alcohols comprising about 3 to 12 carbon atoms; and
an additive comprising:
a friction reducer and a modifier in a range of 0.1 wt. % to 5 wt. %;
an anti-wear agent in a range of 0.1 wt. % to 5 wt. %; and
an extreme pressure agent, an oxidation inhibitor, and a corrosion inhibitor,
wherein the lubricating grease is formulated to provide tribological protection for the electrical vehicle applications, and
wherein the surface-active ester is an oil with a carbon backbone with two distinct side chains, the first side chain is hydrophobic, and the second side chain is polar, and
wherein the lubricating oil has a bulk KV 100 of about 2 cSt or less than 2 cSt.
2. The lubricating grease of claim 1 , wherein the thickener comprises lithium complex thickener.
3. The lubricating grease of claim 1 , wherein the thickener comprises polyurea thickener.
4. A lubricating grease for electric vehicle applications comprising:
a thickener in a range of 6% by weight (wt. %) to 12 wt. %;
a lubricating oil in a range of 57 wt. % to 92.98 wt. %; and
a surface-active ester present in an amount of 3 wt. % to 8 wt. %, the surface-active ester comprising a synthetic copolymer of alpha-olefins and dicarboxylic acids esterified with short to medium chain alcohols comprising about 3 to 12 carbon atoms,
wherein the lubricating grease excludes a friction reducer and a modifier, an anti-wear agent, an extreme pressure agent, an oxidation inhibitor, and a corrosion inhibitor, and is formulated to provide tribological protection for the electrical vehicle applications, and
wherein the surface-active ester is an oil with a carbon backbone with two distinct side chains, the first side chain is hydrophobic, and the second side chain is polar.
5. The lubricating grease of claim 4 , wherein the lubricating grease has a bulk KV 40 less than 10 cSt and a bulk KV 100 less than 2 cSt.
6. The lubricating grease of claim 1 , wherein the lubricating oil comprises an oil blend of ISO VG 10, ISO VG 68, ISO VG 150, or a combination thereof.
7. The lubricating grease of claim 4 , wherein the thickener comprises lithium complex thickener.
8. The lubricating grease of claim 4 , wherein the thickener comprises polyurea thickener.
9. The lubricating grease of claim 1 is configured to contribute to up to 10% power savings per lubricated component.
10. The lubricating grease of claim 1 is a National Lubricating Grease Institute (NLGI) #2 consistency grade.
11. The lubricating grease of claim 4 , wherein the surface-active ester comprises an ester blend of KV 40=100 cSt, an ester blend of KV 40=200 cSt, an ester blend of KV 40=300 cSt, or a combination thereof.
12. The lubricating grease of claim 4 , wherein
the thickener comprises lithium complex thickener of 10 wt. %;
the lubricating oil comprises ISO VG 10, API groups I, II, and/or V oil blend of 74.5 wt. %; and
the surface-active ester is 8 wt. %.
13. The lubricating grease of claim 4 , wherein
the thickener comprises lithium complex thickener of 10 wt. %;
the lubricating oil comprises an oil blend of 74.5 wt. % comprising ISO VG 10, API group III oil and/or API group IV oil; and
the surface-active ester is 8 wt. % .
14. The lubricating grease of claim 4 , wherein
the thickener comprises a polyurea thickener of 10 wt. %;
the lubricating oil comprises ISO VG 10, API groups I, II, and/or V oil blend of 74.5 wt. %; and
the surface-active ester is 8 wt. %.
15. The lubricating grease of claim 4 , wherein
the thickener comprises a polyurea thickener of 10 wt. %;
the lubricating oil comprises an oil blend of 74.5 wt. % comprising ISO VG 10, API group III oil and/or API group IV oil; and
the surface-active ester is 8 wt. %.
16. A method of lubricating components in an electric vehicle, comprising
applying a lubricating grease in the components in the electric vehicle, wherein the lubricating grease comprises:
a thickener in a range of 6% by weight (wt. %) to 12 wt. %;
a lubricating oil in a range of 57 wt. % to 92.98 wt. %, the lubricating oil consisting of synthetic oil selected from API groups III and IV; and
a surface-active ester in a range of 3 wt. % to 8 wt. %, the surface-active ester comprising a synthetic copolymer of alpha-olefins and dicarboxylic acids esterified with short to medium chain alcohols comprising about 3 to 12 carbon atoms, wherein the lubricating grease excludes a friction reducer and a modifier, an anti-wear agent, an extreme pressure agent, an oxidation inhibitor, and a corrosion inhibitor, and wherein the surface-active ester is an oil with a carbon backbone with two distinct side chains, the first side chain is hydrophobic, and the second side chain is polar.
17. The method of claim 16 , wherein the components comprise wheel bearings, constant velocity joints, universal joints, electric motor bearings, or any combinations thereof.