Spindle motor and hard disk drive device
AssigneeMINEBEA MITSUMI Inc.
InventorsHideaki Showa, Daigo Nakajima
Life of this patent
Estimating the term…
Abstract
The spindle motor includes; a shaft including a shaft portion and a flange portion, the shaft portion having a columnar shape extending in an axial direction, the shaft portion including a shaft end portion, the flange portion being provided at the shaft end portion and receiving a load in the axial direction; and a bearing sleeve rotatably supporting the shaft, the bearing sleeve having a tubular shape including a sleeve end portion having a large-diameter recess part formed in the axial direction. The shaft is a member formed of a copper alloy containing from 0.5 mass percent to 1.5 mass percent of silicon and from 0.5 mass percent to 3.0 mass percent of manganese, and the member includes the shaft portion and the flange portion integrated with one another.
Claims7
A spindle motor comprising:
- a shaft including a shaft member and a flange portion, the shaft member having a columnar shape extending in an axial direction, the shaft member including a shaft end portion, the flange portion being provided at the shaft end portion and receiving a load in the axial direction;
- and
- a bearing sleeve rotatably supporting the shaft, the bearing sleeve having a tubular shape and including a sleeve end portion having a first opening part formed in the axial direction, wherein
- the shaft is a member formed of a copper alloy containing from 0.5 mass percent to 1.5 mass percent of silicon and from 0.5 mass percent to 3.0 mass percent of manganese, and the member includes the shaft member and the flange portion integrated with one another.
Dependencies are inferred from the claim text.