| 摘要 |
PROBLEM TO BE SOLVED: To prevent heating cycles from causing the base oil of bearing grease to leak by fixing and sealing a magnetic fluid seal provided on the upper side of a bearing with an elastic material. SOLUTION: In a magnetic fluid seal 12, a magnetic fluid 16 is held with magnetic force and a magnetic fluid seal holder 13 is made of a non-magnetic material, for example, aluminum and holds the magnetic fluid seal 12. This magnetic fluid seal 12 and the magnetic fluid seal holder 13 are sealed and fixed with an elastic material 15, preferably rubber. The elasticity of the elastic material 15 is obtainable by pressing a magnetic fluid protecting plate 14 into a hub 2. This structure enables heating cycles not to cause the leakage of the base oil of bearing grease and also enables improvement of outgassing. Furthermore, easy assembling in the manufacture realizes a high quality, cost-effective motor. |
