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US 8,007,175 B2Granted
Hydrodynamic bearing device, and spindle motor and information apparatus equipped with same
AssigneePanasonic Corporation
InventorsYoshihito Watanabe, Hiroyuki Kiriyama
Life of this patent
Estimating the term…
Abstract
The cross sectional shape of an axial direction communicating path when viewed in the axial direction is flat in the circumferential direction, and the cross sectional area of the communicating path gradually decreases moving from the center of the cross section toward the both ends in the circumferential direction. When a sleeve and a cover member are bonded with an adhesive, the adhesive is actively made to flow into an adhesive inflow portion.
Claims22
A hydrodynamic bearing device, comprising:
- a shaft;
- a sleeve that has a bearing hole in which the shaft is relatively rotatably inserted via a tiny gap;
- a cover member that is fixed to the sleeve with an adhesive so as to cover at least part of an end surface of the sleeve at one end in the axial direction, or at least part of a cylinder surface on the outer peripheral side of the sleeve;
- a communicating path that is formed between the cylinder surface on the outer peripheral side of the sleeve and the inner peripheral surface of the cover member and passes through in the axial direction from the end surface at one end toward the end surface at the other end in the axial direction, or is formed between the end surface at one end of the sleeve and the cover member and passes through from the bearing hole to the outer peripheral side of the sleeve in the radial direction;
- a lubricant that fills a space including at least the tiny gap and the communicating path;
- a hydrodynamic bearing portion that rotates and floats the shaft relative to the sleeve when the shaft and the sleeve rotate relatively to one another;
- and
- an adhesive inflow portion that is disposed on both sides in the circumferential direction of the communicating path and is where the adhesive, which fixes the sleeve and the cover member, flows in.
5 more elements
A hydrodynamic bearing device, comprising:
- a center shaft member having a flange on at least one end in the axial direction;
- an outer cylinder member that is fitted over the center shaft member and is fixed to the center shaft member with an adhesive;
- a sleeve that has a bearing hole in which the outer cylinder member is relatively rotatably inserted via a tiny gap;
- a communicating path that is formed between the outer cylinder member and the center shaft member and passes through from one end in the axial direction toward the other end in the axial direction, or is formed between the flange of the center shaft member and the end of the outer cylinder member and passes through in the radial direction from the bearing hole to the inner peripheral surface of the outer cylinder member;
- a lubricant that fills a tiny space including at least the tiny gap and the communicating path;
- and
- an adhesive inflow portion that is disposed on both sides in the circumferential direction of the communicating path and is where the adhesive, which fixes the center shaft member and the outer cylinder member, flows in.
4 more elements
Dependencies are inferred from the claim text.