| 摘要 |
PROBLEM TO BE SOLVED: To obtain a fluid bearing having a low temperature dependency of a bearing torque and suppressed evaporation loss even after a long service by packing a monoester-based lubricating fluid into the gap of a fluid bearing. SOLUTION: The monoester oil based oil (M-816 or M-816+DOS) used as a base oil for a fluid bearing has a high viscosity index and a low viscosity, so that it can provide a low bearing torque over a wide temperature range and has reduced tendency toward spattering even when the fluid bearing is rotated at a high speed. It is desirable that the monoester is used in combination with other esters such as dioctyl sebacate(DOS) having a cloud point of 0 deg.C or below, for it has a limited service temperature range because of its lowered fluidity at a low temperature. The monoester based fluid shows low evaporation loss with the lapse of time and is excellent in totality as a lubricating fluid for the fluid bearing of a spindle motor. |
