Hydrodynamic bearing device, spindle motor having the same, and recording disk driving device
AssigneeSamsung Electro-Mechanics Co., Ltd.
InventorsHo Kyung JANG, Kyung Moon JUNG, Yong Sik KIM, Jae Hyuk KIM
Life of this patent
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Abstract
A hydrodynamic bearing device includes a stator and a rotor. The rotor forms a bearing clearance and a sealing part connected with the bearing clearance. A liquid-vapor interface is disposed in the sealing part together with the stator, and the bearing clearance is filled with a lubricating fluid. The stator and the rotor form a storage space connected with the sealing part to receive the lubricating fluid. The storage space has a region in which force applied to the liquid-vapor interface increases by a capillary phenomenon at a time that the lubricating fluid leaks to fill the bearing clearance.
Claims26
A hydrodynamic bearing device, comprising:
- a stator;
- and
- a rotor forming a bearing clearance and a sealing part connected with the bearing clearance, wherein a liquid-vapor interface is disposed in the sealing part together with the stator, and the bearing clearance is filled with a lubricating fluid,
- wherein the stator and the rotor form a storage space connected with the sealing part to receive the lubricating fluid, and
- wherein the storage space has a region in which force applied to the liquid-vapor interface increases by a capillary phenomenon at a time that the lubricating fluid leaks to fill the bearing clearance.
A hydrodynamic bearing device, comprising:
- a stator;
- and
- a rotor forming a bearing clearance and a sealing part connected with the bearing clearance, wherein
- a liquid-vapor interface is disposed in the sealing part together with the stator, and the bearing clearance is filled with a lubricating fluid,
- the stator and the rotor form a storage space connected with the sealing part to receive the lubricating fluid leaked from the bearing clearance, and
- the bearing clearance comprises a sealing reinforcement part formed therein, forming a labyrinth seal with the sealing part and comprising a gap of variable size.
A spindle motor, comprising:
- a base member;
- a lower thrust member connected to the base member;
- a shaft connected to the lower thrust member and including an upper thrust member extended from a flange part at an upper end portion of the shaft;
- and
- a rotating member configured to form a bearing clearance together with the lower thrust member and the shaft, wherein
- the bearing clearance is filled with a lubricating fluid,
- the upper thrust member and the flange part form a storage space configured to receive the lubricating fluid filling the bearing clearance, together with the rotating member, and
- a lower surface of the upper thrust member and a surface of the rotating member facing the lower surface of the upper thrust member form a flow suppression clearance.
A hydrodynamic bearing device, comprising:
- a stator comprising a lower thrust member and a shaft;
- and
- a rotor forming a bearing clearance and a first sealing part connected with the bearing clearance, wherein
- a liquid-vapor interface is disposed in the first sealing part together with the stator, and the bearing clearance is filled with a lubricating fluid,
- the stator and the rotor form a storage space connected with the first sealing part to receive the lubricating fluid, and
- a lower surface of an upper thrust member of the shaft and a facing surface of a rotating member of the rotor facing the lower surface of the upper thrust member form a flow suppression clearance,
- the first sealing part is formed between the upper thrust member and the rotating member,
- a second sealing part is formed between the lower thrust member and the rotating member, and
- when a pressure, P1, is applied to a first liquid-vapor interface disposed in the second sealing part and a pressure, P2, is applied to a second liquid-vapor interface disposed in the first sealing part, a pressure differential between P1 and P2 is defined as P1−P2.
Dependencies are inferred from the claim text.