Patent ID: 8134248

Claim:
An aerogenerator, comprising: a support pillar placed upright on ground, the support pillar having a hollow space therein, with a support extension extending a predetermined distance from an upper end of the support pillar inwards such that the hollow space is open on the upper end of the support pillar through a center of the support extension; a rotational body, provided on the upper end of the support pillar, which is rotatable on a rotation support unit having rollers, the rotational body including vanes provided on opposite ends of the rotational body, the vanes being rotatable by wind; and a rotating force transmission unit to transmit a rotating force of the vanes to a generating unit, wherein the rotation support unit includes: a rotating plate provided between the rotational body and the support pillar; first rollers provided at a perimeter of the rotating plate at positions spaced apart from each other at regular intervals around the circumference of the rotating plate, the first rollers in contact with a lower surface of the rotational body and an upper surface of the support extension of the support pillar; and second rollers provided under a perimeter of a lower surface of the rotating plate at positions spaced apart from each other at regular intervals around the circumference of the rotating plate, the second rollers in contact with an inner surface of the hollow space of the support pillar, whereby the rotational body easily rotates on the upper surface of the support extension of the support pillar because of the first rollers, and the rotational plate is prevented from being separated from the upper end of the support pillar by the second rollers, wherein roller support shafts are fastened to the lower surface of the rotating plate and bent towards the inner surface of the support pillar, and the second rollers are rotatably mounted on ends of the respective roller support shafts and are in contact with the inner surface of the support pillar.