Rotor assembly and fluid transmission device having the same

A fluid transmission device, comprising:

• a housing having an accommodating space, wherein one end of the housing has an opening communicated with the accommodating space;
• a motor located in the accommodating space of the housing;
• and
• an rotor assembly located in the accommodating space of the housing, and comprising:
• a rotation axis connected to the motor;
• a propeller located in the opening of the housing and comprising a hub portion and a plurality of fan blades extending outward from the hub portion, wherein the hub portion is located on one end of the rotation axis, and an inner sidewall of the hub portion has a gear structure surrounding the rotation axis;
• an active ring sleeving on the rotation axis;
• at least one driver link pivotally connected to the active ring;
• and
• at least one reciprocating spring telescopically disposed on the active ring and abutting against the driver link, wherein when the rotation axis drives the active ring to rotate, the driver link abuts against the gear structure of the hub portion and compresses the reciprocating spring due to a force generated by rotation, and when the rotation axis stops rotating, the reciprocating spring returns to an initial position to push the driver link to separate from the gear structure.