Patent ID: 9664288
Date: 2017-05-30
CPC Classifications: F02C,F16J

Claim:
1. A shaft seal device comprising a rotating member, a stationary member, and a lip seal for creating a seal between the rotating member and the stationary member which are concentrically disposed one inside the other with respect to a radial direction; wherein: a plurality of suction portions and a plurality of discharge portions axially aligned with the plurality of suction portions are formed on an outer circumferential surface of said rotating member and disposed alternating around a circumference of the rotating member for generating pumping action via relative rotational sliding of said lip seal and said rotating member; and wherein: each suction portion and each discharge portion are circumferentially spaced from each other, each suction portion having first periodic linear indentations which are formed having a first direction of inclination at a first predetermined angle with respect to a circumferential direction of the rotating member so that the sealed fluid is drawn into the first periodic linear indentations, each discharge portion having second periodic linear indentations which are formed having a second direction of inclination at a second predetermined angle with respect to the circumferential direction of the rotating member so that-the sealed fluid is expelled from the second periodic linear indentations, and the first direction of inclination and the second direction of inclination being opposite to each other with respect to the circumferential direction of the rotating member, a lip of said lip seal extending in an axial direction toward an atmosphere side, leaving part of each suction portion and also part of each discharge portion towards a sealed fluid side uncovered, so that the sealed fluid side and the atmosphere side are cut off from each other by pressed contact of the lip.