Title:
FLUID BEARING DEVICE, MOTOR, AND DISC DRIVING DEVICE
Document Type and Number:
Japanese Patent JP2018185016
Kind Code:
A
Abstract:
PROBLEM TO BE SOLVED: To provide a structure for easily processing an air circulation groove for stabilizing an interface of a lubrication oil while securing rigidity, in a fluid bearing device, a motor and a disc driving device.SOLUTION: A spindle motor includes a shaft disposed along a center shaft vertically extended, a rotary portion opposed to an outer peripheral face of the shaft and rotatable to the shaft on the center shaft, a lubrication oil charged between an upper outer peripheral face and a lower outer peripheral face of the shaft and the rotary portion in the axial direction, a first groove formed along a circumferential direction on at least one of a center portion outer peripheral face of the shaft in the axial direction and an inner peripheral face of the rotary portion opposed to the central portion outer peripheral face, a plurality of second grooves disposed on a top face of the rotary portion, and a plurality of communication holes formed on the rotary portion and communicated to each of the plurality of second grooves and the first groove.SELECTED DRAWING: Figure 2
Inventors:
SUGINOBU SHINGO
Application Number:
JP2017087868A
Publication Date:
November 22, 2018
Filing Date:
April 27, 2017
Export Citation:
Assignee:
NIHON DENSAN KK
International Classes:
F16C33/10; F16C17/10; H02K7/08
Attorney, Agent or Firm:
Takami Nishida