Abstract: A seal assembly for use in providing a dynamic fluid seal between a relatively rotating housing and shaft. The seal assembly eliminates the need for either a fixed internal thrust bearing or seal assembly contact with an adjacent inner bearing race. The seal assembly includes a spacer which provides an axial gap between a sleeve and seal support during installation. The spacer transmits the axial shaft installation load through the seal assembly into the housing. Once the seal assembly is installed, the spacer is removed, whereby the gap between the sleeve and seal support eliminates heat due to contact friction and reduces seal degradation.

Abstract: A sealing device provides sealing between two members adapted for relative concentric motion. The main seal comprises a pair of annual seal members attached respectively to the two members. An auxiliary seal serves to prevent the intrusion of foreign matter into the main seal. The auxiliary seal comprises a minute gap having a spiral flow passage which exerts a screw pump action to discharge external foreign matter to the side opposite to the main seal due to relative rotation. The main seal includes a first seal member having a radially extending flange portion abutting an end surface of a housing. The main seal includes a second seal member having a radially extending portion opposed to the radially extending flange portion of the first seal member. A buffer portion for buffering axial load is located between the flange portion and the radially extending portion.