Shock absorber lubricant composition, shock absorber, and method for adjusting friction characteristics of shock absorber lubricant
AssigneeKYB Corporation
InventorShinji Kato
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Abstract
Provided are a lubricant composition for shock absorbers, a lubricant additive, and a method of adjusting friction characteristics of a lubricant composition for shock absorbers, each capable of satisfying both the operational stability and ride comfort. The lubricant composition for shock absorbers contains a base oil and a friction adjusting agent, the friction adjusting agent contains pentaerythritol esters, and the pentaerythritol esters contain a pentaerythritol tetraester and a pentaerythritol ester other than the pentaerythritol tetraester.
Claims12
A lubricant composition for shock absorbers, comprising a base oil and a friction adjusting agent, wherein
- the friction adjusting agent contains pentaerythritol esters,
- the pentaerythritol esters contain a pentaerythritol tetraester and a pentaerythritol ester other than the pentaerythritol tetraester, and
- the pentaerythritol tetraester is contained in a ratio of 90% or less in the pentaerythritol ester, and the pentaerythritol ester other than the pentaerythritol tetraester is contained in a ratio of 10% or more in the pentaerythritol ester.
A lubricant composition for shock absorbers, comprising a base oil and a friction adjusting agent, wherein
- the friction adjusting agent contains pentaerythritol esters,
- the pentaerythritol esters contain a pentaerythritol tetraester and a pentaerythritol ester other than the pentaerythritol tetraester, and
- supposing that a friction coefficient at the time of transition from a stationary state to a sliding state is B and a friction coefficient in a sliding state is A, a mixing ratio of the pentaerythritol tetraester and the pentaerythritol ester other than the pentaerythritol tetraester is such that a spike index represented by (B−A)/A is 0.10 or more.
A lubricant composition for shock absorbers, comprising a base oil and a friction adjusting agent, wherein
- the friction adjusting agent contains pentaerythritol esters,
- the pentaerythritol esters contain a pentaerythritol tetraester and a pentaerythritol ester other than the pentaerythritol tetraester, and
- the mixing ratio of the pentaerythritol tetraester in the pentaerythritol esters is 40% or more.
A method of adjusting friction characteristics of a lubricant composition for shock absorbers containing a base oil and pentaerythritol esters,
- the pentaerythritol esters containing a pentaerythritol tetraester and a pentaerythritol ester other than the pentaerythritol tetraester, comprising a step of:
- adjusting a mixing ratio of the pentaerythritol tetraester and the pentaerythritol ester other than the pentaerythritol tetraester and thereby adjusting friction characteristics of the lubricant composition for shock absorbers.
Dependencies are inferred from the claim text.