Lubricant composition for shock absorbers, additive for friction adjustment, lubricant additive, shock absorber and friction adjustment method for lubricant composition 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 friction adjusting additive for a lubricant for shock absorbers, and a lubricant additive, each capable of satisfying both operational stability and ride comfort and improving the ride comfort further. The lubricant composition for shock absorbers contains a base oil and a friction adjusting agent and the friction adjusting agent contains a first zinc dithiophosphate represented by the following formula 1: [in the formula 1, R11 to R14 are alkyl groups in which one or more and three or less is/are a primary alkyl group and the other(s) is/are a secondary alkyl group].
Claims10
A shock absorber including a lubricant composition, the lubricant composition comprising a base oil and a friction adjusting agent, wherein the friction adjusting agent contains a first zinc dithiophosphate represented by the following formula 1 and a second zinc dithiophosphate represented by the following formula 2:
- [in the formula 1, R11 to R14 are alkyl groups in which one or more and three or less is/are a primary alkyl group and the other(s) is/are a secondary alkyl group],
- [in the formula 2, R21 to R24 are each a secondary alkyl group];
- wherein the primary alkyl group which the first zinc dithiophosphate has is an alkyl group having 4 to 12 carbon atoms;
- the secondary alkyl group which the first zinc dithiophosphate has is an alkyl group having 3 to 6 carbon atoms;
- the first zinc dithiophosphate is contained in an amount of 0.25 mass % or more and 2 mass % or less in the lubricant composition;
- and
- the secondary alkyl group which the second zinc dithiophosphate has is an alkyl group having 3 to 8 carbon atoms.
A lubricant composition, comprising a first zinc dithiophosphate represented by the following formula 1 and a second zinc dithiophosphate represented by the following formula 2:
- [in the formula 1, R11 to R14 are alkyl groups in which one or more and three or less is/are a primary alkyl group and the other(s) is/are a secondary alkyl group],
- [in the formula 2, R21 to R24 are each a secondary alkyl group];
- wherein the primary alkyl group which the first zinc dithiophosphate has is an alkyl group having 4 to 12 carbon atoms;
- the secondary alkyl group which the first zinc dithiophosphate has is an alkyl group having 3 to 6 carbon atoms;
- the first zinc dithiophosphate is contained in an amount of 0.25 mass % or more and 2 mass % or less in the lubricant composition;
- and
- the secondary alkyl group which the second zinc dithiophosphate has is an alkyl group having 3 to 8 carbon atoms.
A shock absorber including a lubricant composition, the lubricant composition comprising a base oil and a friction adjusting agent, wherein the friction adjusting agent contains a first zinc dithiophosphate represented by the following formula 1 and a second zinc dithiophosphate represented by the following formula 2:
- [in the formula 1, R11 to R14 are alkyl groups in which one or more and three or less is/are a primary alkyl group and the other(s) is/are a secondary alkyl group],
- [in the formula 2, R21 to R24 are each a secondary alkyl group];
- wherein the content of the second zinc dithiophosphate is smaller than the content of the first zinc dithiophosphate.
A lubricant composition, comprising a first zinc dithiophosphate represented by the following formula 1 and a second zinc dithiophosphate represented by the following formula 2:
- [in the formula 1, R11 to R14 are alkyl groups in which one or more and three or less is/are a primary alkyl group and the other(s) is/are a secondary alkyl group],
- [in the formula 2, R21 to R24 are each a secondary alkyl group];
- wherein the content of the second zinc dithiophosphate is smaller than the content of the first zinc dithiophosphate.
Dependencies are inferred from the claim text.