| 摘要 |
An axial fan has a hub supporting blades. The hub is attached to a rotor of an electric motor at one or more points of connection by respective connecting devices. Each connecting device includes an annular damper, arranged in an opening of the hub, and through which a screw passes. Placed between the damper and the screw is a rigid element having one end resting against the rotor. The other end has an annular flange-like formation disposed between the damper and a head of the screw. The rigid element has an annular skirt which extends from the flange-like formation, around the damper, up to a preset distance from the hub of the fan, such that when the fan performs an oscillation greater than a predetermined extent, it impacts this skirt thereby limiting its oscillation. |
| 主权项 |
1. An electric cooling fan comprising:
an electric motor including a rotor and a stator, and an axial fan, with a central hub from which there extends a plurality of blades and which is connected to the rotor of the motor at one or more points of connection, at the or each point of connection, the hub of the fan being connected to the rotor of the motor by means of a respective connecting device including a vibration damper, arranged in an opening of the hub, and through which a fastening member passes, there being placed between the damper and the corresponding fastening member a rigid element having one end resting against the rotor and the other end which has an annular flange-like formation resting against the damper at the side opposite the rotor; wherein the rigid element has an annular skirt which extends from the flange-like formation, around the damper, to a preset distance from the hub, in such a way that when the fan performs, with respect to the rotor, an oscillation greater than a predetermined extent, the hub impacts the skirt thereby limiting the extent of the oscillation. |
