Patent ID: 8736096

Claim:
A water flow electricity generating device comprising: a stator that supports an annular stator core in which a coil is provided; a rotor that includes a magnet, a rotor main body, a blade support unit, and a rotating blade, the magnet causing a magnetic force to act on the coil, the rotor main body being disposed on an inner circumferential side of the stator core to support the magnet, the blade support unit being provided on one side in a rotating axis line direction of the rotor main body, the rotating blade projecting radially outward from the blade support unit; a water-lubricated bearing that is disposed while being opposed to the rotor main body, the water-lubricated bearing supporting loads in a thrust direction and a radial direction; and an air volume adjusting device, wherein the blade support unit is disposed on one side in the rotating axis line direction of the rotor main body, the rotor includes a float unit that is disposed on one side in the rotating axis line direction of the rotor main body, and the air volume adjusting device adjusts an air volume in the float unit.