Hydrodynamic bearing device, and spindle motor and information device using the same
View Patent ↗A hydrodynamic bearing device comprises at least one of a rotating component and a fixed component having a dynamic pressure-generating mechanism, and a lubricant present in a gap between the rotating component and the fixed component; wherein the lubricant contains at least one compound selected from the group consisting of aliphatic ethers having one or more ether bonds and a total carbon number of 24 to 39.
1. A hydrodynamic bearing device, comprising at least one of a rotating component and a fixed component having a dynamic pressure-generating mechanism, and a lubricant present in a gap between the rotating component and the fixed component;
wherein the lubricant contains at least one compound selected from the group consisting of aliphatic ethers represented by Formula (2) and Formula (4);
R 3 —O—A—O—R 4 (2)
R 7 —O—X—O—Y—O—Z—O—R 8 (4),
wherein:
R 3 and R 4 represent a C 8 to C 12 alkyl group,
A is 3,3-diethylpentylene or 2,4-diethylpentylene,
R 7 and R 8 each represents a C 9 to C 11 alkyl group, and
X, Y and Z are each 2-methylethylene, and
the aliphatic ether of Formula (2) has a total carbon number of 25 to 32.