US 11,988,196 B2
Wind energy generation system
Takeshi Sasakawa, Tokyo (JP)
Assigned to ELECTRIC POWER DEVELOPMENT CO., LTD., Tokyo (JP)
Appl. No. 17/757,885
Filed by Electric Power Development Co., Ltd., Tokyo (JP)
PCT Filed Dec. 22, 2020, PCT No. PCT/JP2020/047957
§ 371(c)(1), (2) Date Jun. 22, 2022,
PCT Pub. No. WO2021/132244, PCT Pub. Date Jul. 1, 2021.
Claims priority of application No. 2019-234795 (JP), filed on Dec. 25, 2019.
Prior Publication US 2023/0036819 A1, Feb. 2, 2023
Int. Cl. F03D 80/80 (2016.01); F03D 80/70 (2016.01)
CPC F03D 80/80 (2016.05) [F03D 80/70 (2016.05)] 4 Claims
OG exemplary drawing
 
1. A wind energy generation system comprising:
a tower;
a nacelle provided in an upper portion of the tower to be rotatable around a central axis of the tower;
a hub provided in front of the nacelle to be rotatable around an axis orthogonal to the central axis; and
one or more blades provided in the hub,
wherein an oil receiving portion is provided on an outer wall of the tower to protrude outward from the outer wall and encircle the outer wall around the central axis, and
one or more opening portions that guide oil received by the oil receiving portion into the tower is provided at a portion of the outer wall of the tower at which the oil receiving portion is provided,
the oil receiving portion includes a protruding portion that protrudes outward from the outer wall of the tower, and a tubular side wall portion that rises upward from a tip portion of the protruding portion on a side opposite to the outer wall,
a lower tubular portion is provided at a circumferential end portion of the opening portion into which the tower is fitted in a bottom portion of the nacelle, and
the lower tubular portion is inserted into the side wall portion of the oil receiving portion and a lower end of the lower tubular portion is separated from an upper surface of the protruding portion.