Lubricant composition for shock absorbers, shock absorber, and method for adjusting friction of lubricant for shock absorbers
AssigneeKYB Corporation
InventorShinji Kato
Life of this patent
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Abstract
To provide a lubricant composition for shock absorbers, a shock absorber, and a method for adjusting the friction of a lubricant composition for shock absorbers, each capable of satisfying both operational stability and ride comfort particularly at the time of a minute amplitude. The lubricant composition for shock absorbers contains a base oil and a friction adjusting agent, wherein the friction adjusting agent contains a pentaerythritol ester, the pentaerythritol ester contains a pentaerythritol tetraester at the highest proportion or in an amount of 50 mass % or more, and the pentaerythritol ester content is 0.5 mass % or more.
Claims8
A lubricant composition for shock absorbers, comprising:
- a base oil, a friction adjusting agent and zinc dithiophosphate, wherein
- the friction adjusting agent contains a pentaerythritol ester,
- the pentaerythritol ester is a mixture of a pentaerythritol tetraester and a pentaerythritol ester other than the pentaerythritol tetraester,
- the mixture of the pentaerythritol ester contains a pentaerythritol tetraester at the largest proportion,
- a content of the pentaerythritol ester is 0.5 mass % or more, and
- the zinc dithiophosphate has an alkyl group having 3 to 5 carbon atoms.
Dependencies are inferred from the claim text.