Fan for generating an air flow
AssigneeNidec Corporation
InventorJunpei Kitamura
Life of this patent
Estimating the term…
Abstract
A weight adjustment portion is formed at an upper end of a hub to project radially inward. An approximately U-shaped balance clip is attached to the weight adjustment portion. A gap to be constantly ensured is formed axially between the weight adjustment portion and a rotor holder. For ensuring the gap, a plurality of seats are provided on the lower surface of the weight adjustment portion at regular circumferential intervals. The rotor holder is press-fitted to the hub until the rotor holder comes into contact with the seats. The upper surface of the weight adjustment portion is positioned lower than the uppermost portion of the hub, thereby preventing the balance clip projecting from the uppermost portion of the hub when the balance clip is attached to the weight adjustment portion.
Claims14
A fan comprising:
- a substantially cylindrical rotor holder with a lid rotatable about an axis;
- a substantially annular rotor magnet secured on the inner peripheral surface of the rotor holder;
- an armature arranged inside the rotor holder and facing the rotor magnet;
- a substantially cylindrical hub extending along the axis and having a circumferential wall secured to an outer surface of the rotor holder;
- and
- a plurality of blades arranged on the hub and turnable by the torque to generate an airflow, wherein
- a weight adjusting portion is provided at one of axial ends of the hub to project inward in a radial direction substantially perpendicular to the axis, the weight adjusting portion and the hub covering at least an outer periphery of the lid of the rotor holder, and
- the weight adjusting portion is axially spaced away from the rotor holder.
Dependencies are inferred from the claim text.