US 12,308,047 B2
Spindle motor with bearing part arrangement and disk driving device having same
Kazuhiro Sato, Kyoto (JP); Shingo Suginobu, Kyoto (JP); Junya Mizukami, Kyoto (JP); Masahiro Imahori, Kyoto (JP); Tomoki Uchibori, Kyoto (JP); and Naoyuki Kimura, Kyoto (JP)
Assigned to NIDEC CORPORATION, Kyoto (JP)
Appl. No. 18/283,444
Filed by NIDEC CORPORATION, Kyoto (JP)
PCT Filed Mar. 31, 2022, PCT No. PCT/JP2022/016895
§ 371(c)(1), (2) Date Sep. 21, 2023,
PCT Pub. No. WO2022/211105, PCT Pub. Date Oct. 6, 2022.
Claims priority of application No. 2021-062979 (JP), filed on Apr. 1, 2021.
Prior Publication US 2024/0177736 A1, May 30, 2024
Int. Cl. G11B 19/20 (2006.01); F16C 17/10 (2006.01); G11B 5/82 (2006.01); H02K 5/167 (2006.01); H02K 5/24 (2006.01)
CPC G11B 19/2009 (2013.01) [F16C 17/105 (2013.01); G11B 5/82 (2013.01); G11B 19/20 (2013.01); G11B 19/2036 (2013.01); H02K 5/1677 (2013.01); H02K 5/24 (2013.01); F16C 2370/12 (2013.01)] 15 Claims
OG exemplary drawing
 
1. A spindle motor comprising:
a shaft that extends along a center axis extending in a vertical direction;
a base part that has a through hole to which a lower end portion of the shaft is fixed;
a stator core in an annular shape that is disposed on an upper surface of the base part and surrounds the shaft;
a rotor that rotates around the center axis; and
a bearing part that rotatably supports the rotor with the shaft as a center axis,
wherein the shaft has a screw hole extending axially downward from an upper end of the shaft,
wherein the screw hole has a screw part onto which a screw is screwed,
wherein the bearing part includes:
an upper annular member and a lower annular member which protrude radially outward from an outer peripheral surface of the shaft and are disposed to be spaced apart from each other in an axial direction; and
a sleeve in a cylindrical shape that has an insertion hole into which the shaft is inserted, covers the outer peripheral surface of the shaft, and extends in the axial direction, and
wherein an upper end of the upper annular member is disposed lower than a lower end of the screw part in the axial direction.