Patent ID: 8672093

Claim:
A wind turbine generator, comprising: a lubricating system including a lubricating-oil storage space; a lubricating-oil pump; and a lubricating-oil flow path connected to the lubricating-oil pump; wherein the lubricating system is configured to circulate lubricating oil in the lubricating-oil storage space through the lubricating-oil flow path; the lubricating system further comprises a lubricating-oil recovery line which is configured to be formed when the lubricating-oil pump is stopped for lubricating-oil recovery and in which the lubricating oil drains by way of gravity and is recovered in the lubricating-oil storage space, and a plurality of air vents that communicates with an atmosphere at a time of lubricating-oil recovery and that is disposed at a highest position in the lubricating-oil flow path; and the lubricating-oil recovery line comprises: a check valve disposed at a low position at a discharge side of the lubricating-oil flow path; a lubricating-oil return flow path branched off from a downstream side of the check valve and connected to the lubricating-oil storage space; and a plurality of automatic opening/closing valves that is disposed in the lubricating-oil return flow path and in the plurality of air vents, and each of the automatic opening/closing valves is configured to be closed during operation of the lubricating-oil pump and opened at the time of lubricating-oil recovery when the lubricating-oil pump is stopped.