Fluid bearing unit and manufactured method thereof
AssigneeKabushiki Kaisha Sankyo Seiki Seisakusho
InventorsMasamichi Hayakawa, Masato Gomyo, Toshihiko Miyakoshi, Arihiro Yonezawa
Life of this patent
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Abstract
A fluid bearing unit includes a shaft; a bearing; bearing fluid arranged between a shaft and a bearing which are rotatably engaged with each other so that they can be relatively rotated so as to generate dynamic pressure in the bearing fluid, wherein at least one of the bearing and the member for fixing the bearing unit is made of iron alloy having the volumetric magnetostriction of which acts to cancel the thermal expansion so as to become the coefficient of linear expansion thereof lower than that of the shaft.
Claims13
A fluid bearing unit comprising:
- a shaft;
- a bearing which circumscribes said shaft with a space therebetween in which a bearing fluid is provided so that said shaft and bearing can be relatively rotated so as to generate dynamic pressure in the bearing fluid;
- and
- a bearing fixing member at least partially circumscribing said bearing for fixing the bearing relative to said shaft;
- a magnetic seal for sealing said bearing fluid within said space so as to magnetize said bearing fluid,
- wherein at least one of the bearing and the bearing fixing member is made of an iron alloy having a volumetric magnetostriction which acts to cancel thermal expansion thereof;
- and
- a stress dispersion means for maintaining the bearing surface in a uniform temperature changing condition, the stress dispersion means being provided in at least one of the bearing and the bearing fixing member.
A fluid bearing unit comprising:
- a shaft;
- a bearing which circumscribes said shaft with a space therebetween in which a bearing fluid is provided so that said shaft and bearing can be relatively rotated so as to generate dynamic pressure in the bearing fluid;
- and
- a bearing fixing member at least partially circumscribing said bearing for fixing the bearing relative to said shaft
- wherein at least one of the bearing and the bearing fixing member is made of an iron alloy having a volumetric magnetostriction which acts to cancel thermal expansion thereof and
- wherein an inner circumferential surface of said bearing fixing member is recessed such that said bearing fixing member includes a plurality of bearing surfaces contacting said bearing.
Dependencies are inferred from the claim text.