Hydrodynamic bearing device
AssigneeOlympus Optical Co., Ltd.
InventorsShoichi Saito, Hiromichi Sakano
Life of this patent
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Abstract
A hydrodynamic bearing device of a shaft, a sleeve rotatably supporting this shaft, wherein a herringbone groove is formed at a predetermined part of an inner periphery wall face of the sleeve, and, a thrust receiver supporting a thrust side of the shaft fixed to a lower face of the sleeve, thereby sealing predetermined lubricant, wherein a spiral groove which is narrower in groove width and shallower in depth than the herringbone groove, and which is oriented to the thrust receiver in a rotation direction of the shaft, is formed on inner periphery wall face of the sleeve.
Claims12
A hydrodynamic bearing device comprising:
- a shaft;
- a sleeve rotatably supporting said shaft, wherein a herringbone groove is formed at a predetermined part of an inner periphery wall face of said sleeve;
- and
- a thrust receiver supporting a thrust side of said shaft fixed to a lower face of said sleeve, thereby sealing predetermined lubricant;
- wherein a spiral groove which is narrower in groove width and shallower in depth than said herringbone groove, and which is oriented to said thrust receiver in a rotation direction of said shaft, is formed on an inner periphery wall face of said sleeve.
Dependencies are inferred from the claim text.