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US 2012/0068564 A1Published application
Hydrodynamic disc drive spindle motor having hydro bearing with lubricant
AssigneeSeagate Technology LLC
InventorRaquib Uddin Khan
Life of this patent
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Abstract
A lubricating fluid contains a synthetic ester base fluid having a viscosity index of at least 110, from 0.01% to 5% by weight, based on the total weight of the lubricating fluid, of at least one tri-C6-C14-aryl phosphate, and from 0.01% by weight to 5% by weight, based on the total weight of the synthetic ester base fluid, of at least one carbodiimide.
Claims20
A spindle motor comprising:
- a stationary member;
- a rotatable member which is rotatable with respect to the stationary member;
- and
- a hydro bearing interconnecting the stationary member and the rotatable member and having working surfaces separated by a lubricating fluid, wherein the lubricating fluid comprises:
- a) a synthetic ester base fluid having a viscosity index of at least 110, and comprising:
- 3-methyl-1,5-pentanediol di(n-hexanoate), 3-methyl-1,5-pentane-diol di(n-heptanoate), 3-methyl-1,5-pentanediol di(n-octanoate), 3-methyl-1,5-pentanediol di(n-nonanoate), 3-methyl-1,5-pentanediol di(n-deaconate), 3-methyl-1,5-pentanediol di(n-undecanoate), 3-methyl-1,5-pentanediol di(n-dodecanoic), 3-methyl-1,5-pentanediol di(n-tridecanoate), or combinations thereof;
- b) from 0.01% to 5% by weight, based on the total weight of the lubricating fluid, of at least one tri-C6-C14-aryl phosphate wherein each of the aryl groups has from 1 to 3 identical or different substituents selected from C1-C12-alkyl groups;
- and
- c) from 0.01% to 5% by weight, based on the total weight of the lubricating fluid, of at least one carbodiimide, wherein the carbodiimide is selected from compounds of formula (II)
- X—N═C═N—Y (II)
- wherein
- X and Y are identical or different and each represents a C1-C20-hydrocarbon residue which may be, or comprise, aliphatic, cycloaliphatic and aromatic groups.
9 more elements
A spindle motor comprising:
- a stationary member;
- a rotatable member which is rotatable with respect to the stationary member;
- and
- a hydro bearing interconnecting the stationary member and the rotatable member and having working surfaces separated by a lubricating fluid, wherein the lubricating fluid comprises:
- a) a synthetic ester base fluid having a viscosity index of at least 110;
- b) from 0.01% to 5% by weight, based on the total weight of the lubricating fluid, of at least one tri-C6-C14-aryl phosphate wherein each of the aryl groups has from 1 to 3 identical or different substituents selected from C1-C12-alkyl groups;
- and
- c) from 0.01% to 5% by weight, based on the total weight of the lubricating fluid, of at least one carbodiimide.
5 more elements
A lubricating fluid comprising:
- a) a synthetic ester base fluid having a viscosity index of at least 110;
- b) from 0.01% to 5% by weight, based on the total weight of the lubricating fluid, of at least one tri-C6-C14-aryl phosphate wherein each of the aryl groups has from 1 to 3 identical or different substituents selected from C1-C12-alkyl groups;
- and
- c) from 0.01% to 5% by weight, based on the total weight of the lubricating fluid, of at least one carbodiimide.
1 more element
Dependencies are inferred from the claim text.