Hyperbolic sealing pressure relief device for preventing lubricating grease loss of motor bearing

The invention relates to a hyperbolic sealing pressure relief device, in particular to a hyperbolic sealing pressure relief device for preventing lubricating grease of a motor bearing from losing. The invention aims to solve the problem of bearing lubricating grease loss caused by pressure difference between an inner cavity and an outer cavity of an existing motor. A bearing sleeves a shaft, an end cover sleeves the bearing, an oil flinger sleeves the shaft and is positioned on the left side of the bearing, an oil baffle disc is mounted between the oil flinger and the bearing, a bearing outer cover sleeves the oil flinger, and a first bearing inner cover and a second bearing inner cover are hermetically inserted to form a hyperbolic sealing inner cover. The hyperbolic sealing inner cover is sleeved on the shaft and located at the right end of the bearing, the motor casing is installed on the end cover, a through hole is formed in the motor casing, the flange and the sealing gasket are installed on the left si