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US 11,993,757 B2Granted
Lubricating oil composition for shock absorber, additive for friction adjustment, lubricating oil additive, shock absorber, and method for adjusting friction of shock absorber lubricating oil
AssigneeKYB Corporation
InventorShinji Kato
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Abstract
To provide a lubricating oil composition for a shock absorber, an additive for friction adjustment, a lubricating oil additive, a shock absorber, and a method for adjusting friction of a shock absorber lubricating oil, capable of achieving both operation stability and riding comfort. A lubricating oil composition for a shock absorber contains a base oil and a friction adjusting agent, in which the friction adjusting agent contains zinc dithiophosphate and pentaerythritol.
Claims5
A shock absorber including a lubricating oil composition, the lubricating oil composition comprising:
- a base oil;
- and
- a friction adjusting agent, wherein
- the friction adjusting agent contains zinc dithiophosphate and pentaerythritol esters and/or pentaerythritol derivatives,
- the zinc dithiophosphate has at least one secondary alkyl group having 3 to 5 carbon atoms,
- wherein
- the pentaerythritol esters and/or pentaerythritol derivatives are contained in 2 to 5 wt. % based on total amount of the lubricating oil composition,
- the pentaerythritol esters and/or pentaerythritol derivatives contain pentaerythritol tetraester and/or pentaerythritol tetraester derivative, and
- all four terminal substituents of the pentaerythritol tetraester and/or pentaerythritol tetraester derivative are ester-bonded oleic acid residues.
6 more elements
Dependencies are inferred from the claim text.