Abstract:A sealing structure was designed to reduce the leakage of the hydraulic swing vane cylinder.The doorshaped sealing structure has the advantage of selfsealing,which can adjust sealing pressure according to work pressure to complete the adaptive sealing of the sealing face.Based on finite element analysis method,the contact model of the doorshaped sealing structure was established in ANSYS,and the effects of precompression magnitude and work pressure on the contact pressure and oil film thickness of the sealing face were studied.The results show that when the precompression magnitude of the doorshaped sealing structure ranges from 0 to 2 mm,the work pressure ranges from 0 to 3 MPa,the contact pressure of sealing surface is linear with precompression magnitude and work pressure,which reflects the ideal selfsealing of sealing surface.The oil film of the sealing surface is in wedgeshaped distribution,and better carrying capacity and lubricity is realized in the sealing surface,which decreases the frictional force and improves the movement efficiency and stability of the hydraulic swing vane cylinder.