A lubricating oil composition for fluid dynamic bearings which comprises 50 to 100% by mass of an ether compound comprising at least one ether bond and having 11 to 34 carbon atoms as the base oil and has a kinematic viscosity of at least 2.2 mm
2
/s at 100° C. is provided. The composition has excellent viscosity characteristics such as excellent fluidity at low temperatures and a small decrease in the viscosity in a high temperature range, exhibits lower evaporability, excellent energy saving property and excellent heat stability and is advantageously used for compact fluid dynamic bearings used under rotation at a high speed.
提供一种用于流体动力轴承的润滑油组合物,其包括质量百分比为50至100%的醚化合物作为
基础油,该醚化合物至少包含一个醚键,
碳原子数为11至34个,并且在100°C时具有至少2.2 mm²/s的运动黏度。该组合物具有出色的黏度特性,如低温下的出色流动性和高温范围内黏度的小幅降低,表现出较低的挥发性,出色的节能性能和优异的热稳定性,适用于在高速旋转下使用的紧凑型流体动力轴承。