Spindle motor and recording disk driving device including the same
AssigneeSamsung Electro-Mechanics Co., Ltd.
InventorsJe Hyun BANG, Ho Kyung Jang
Life of this patent
Estimating the term…
Abstract
There is provided a spindle motor including: a rotating member including a protrusion portion protruded so as to form a clearance narrower than a bearing clearance; and a fixed member having a protrusion corresponding portion protruded so as to be disposed to face the protrusion portion and rotatably supporting the rotating member, wherein the protrusion portion includes a thrust dynamic pressure groove formed therein in order to generate thrust fluid dynamic pressure and has a radial length smaller than that of the protrusion corresponding portion disposed to face the thrust dynamic pressure groove and having a flat surface.
Claims11
A spindle motor comprising:
- a rotating member including a protrusion portion protruded so as to form a clearance narrower than a bearing clearance;
- and
- a fixed member having a protrusion corresponding portion protruded so as to be disposed to face the protrusion portion and rotatably supporting the rotating member,
- wherein the protrusion portion includes a thrust dynamic pressure groove formed therein in order to generate thrust fluid dynamic pressure and has a radial length smaller than that of the protrusion corresponding portion disposed to face the thrust dynamic pressure groove and having a flat surface.
A spindle motor comprising:
- a base member including an installation part on which a stator core is installed;
- a lower thrust member inserted into the installation part;
- a shaft having a lower end portion fixedly installed in the lower thrust member and an upper end portion provided with a flange part;
- a rotating member including a sleeve forming, together with the lower thrust member and the shaft, a bearing clearance and a rotor hub extended from the sleeve;
- and
- a cap member fixedly installed on the rotor hub to prevent leakage of a lubricating fluid from a liquid-vapor interface disposed in a space formed between the flange part and the rotor hub,
- wherein at least one of upper and lower surfaces of the sleeve is provided with a protrusion portion, and at least one of a lower surface of the flange part and an upper surface of the lower thrust member is provided with a protrusion corresponding portion corresponding to the protrusion portion, the protrusion portion including a thrust dynamic pressure groove formed therein in order to generate thrust fluid dynamic pressure and having a radial length smaller than that of the protrusion corresponding portion.
Dependencies are inferred from the claim text.