HYDRAULIC SEAL FOR SHAFT Russian patent published in 1997 - IPC

FIELD: mechanical engineering. SUBSTANCE: oil seal of a shaft, which passes through an opening in the wall of a space to be sealed and is mounted with a spaced relation for permitting rotation on a floating bearing member, has split sealing ring and deflector. There are two different portions in opening along the width of the wall of the space to be sealed. The portion that is far from the space to be sealed is cylindrical and allowed to receive at least one sealing ring. The cross-section of the inner portion increases to the space to be sealed. Between the sealing ring and floating member is a bushing rigidly secured to the shaft. One end face of the bushing arrests movements of the sealing ring. The other end face is a deflector that projects out of the edge of the openings into the space to be sealed. The surface of rotation of the bushing has a portion whose cross-section increases to the space and is conjugated with the inner portion of the opening in the wall with a spaced relation that allows the cross- section of the passageway between them to be increased in the direction of the space. Its maximum diameter does not exceed the minimum diameter of the opening. The surface of rotation of the bushing is provided with at least one screw groove. The average inclination of the surface of the opening on the inner portion of the wall and surface of rotation of the bushing at the sites where the cross-section increases are chosen to be no less than the angle of misalignment due to spaces in bearings and strain. EFFECT: enhanced reliability. 4 cl, 2 dwg