The feasibility of the gap sealing structure applied to the high speed and heavy duty bearing housing was investigated by hydrodynamics.It is found that when the seal disc worked at a working speed of 2 000 r/min,the maximum seal gap width required by the traditional gap seal for complete sealing is 0556 mm,and the operating conditions are harsh.The traditional gap seal structure was improved by increasing the gap of the gap seal structure and adding several air pressure holes on the first stage of the disc.Through calculation and analysis,it is found that when the improved gap seal structure is operated under the working speed of 2 000 r/min,the maximum gap width required for complete sealing could be up to 1 mm,which improves the service conditions of the gap seal structure.The experimental results show that the improved gap seal structure can achieve complete sealing of high speed and heavy duty bearing housing.