Freudenberg-Nok General Partnership

David E Johnston

David Sakata

Milton Loman Griswold

A radial shaft seal for dynamic applications is disclosed. The shaft seal has a case member and a resilient sealing body attached to the case member. The sealing body includes an annular elastomeric member and a resinous ring. The elastomeric member has a radially extending section and a distal end. The resinous ring has a radially extending portion and an edge. The radially extending section is contiguous to the radially extending portion to form a composite seal lip body. The composite seal lip body, as installed, is positioned so that the distal end of the radially extending section and the edge of said radially extending portion engage the shaft in fluid tight relation by the elastomeric member and by the reaction forces of the resinous ring. Therefore, a portion of the reaction forces is shared by the edge and the distal end so as to reduce the wear in the distal end. The seal may optionally have one of several pumping features including uni-directional helical ribs, bi-directional helical ribs, unidirectional keel-shaped helical ribs, bi-directional keel shaped helical ribs and undulating pumping members.

Radial shaft seal

An improved dual lip radial shaft seal is disclosed. The free end of the dual lip seal extends toward the air side of the seal. Optionally, the dual lip seal has an oil side excluder lip seal, an air side dust excluder lip seal, an elastomeric static seal extending from the elastomeric portion of the dual lip seal. In another optional embodiment, a relief groove is formed in the seal. A unitized seal version is also disclosed with two embodiments.

Reverse seal

A radial shaft seal with a membrane is disclosed. The surface of the membrane is in sealing contact with the shaft. A plurality of inclined waves are formed in the surface in response to shear stresses formed by movement of one of the support rings relative to the other. The inclined waves are generally elliptical in shape and form an undulating surface. The direction of the inclined waves can be changed in response to shaft rotation.

Rotary shaft seal

A washer and dirt excluder for use with a seal. The washer and dirt excluder includes a flexible ring where that ring is in contact with an outer flange. The washer and dirt excluder further includes a stopper member located at a center point of the flexible ring. The washer and dirt excluder also includes a protrusion extending from a side of the washer opposite the stopper.

Load bearing washer and dirt excluder

A uni-directional seal member for use on a shaft includes a rigid shell, a support member in contact with the rigid shell, and a resilient sealing member in contact with the support member and an insert washer. The sealing member has a sealing face, where that sealing face has a contact area having a radially extending profile of a cyclically repeating shape.

Uni-directional seal for use on a shaft

A shaft seal of the type utilizing a metal support element or seal case which fits or is inserted into a housing. The seal includes a seal element extending radially inward which when disposed over the shaft causes the seal to flex about a flex section thus applying a contacting force to a seal lip. The seal lip includes a plurality of radial undulations along the seal face, said undulations radial with respect to the axis of the shaft. Said seal lip further including a static seal for engaging the outer circumferential surface of the shaft. The seal element is formed of a semi-rigid material such as a fluorinated resin or thermo-plastic elastomer. Such seals exhibit high-wear characteristics opposed to the low-wear characteristics of an elastomer. Further, the seal element includes a plurality of symmetrical undulations which provide a hydro-dynamic pumping effect to pump any fluid migrating along the shaft/seal interface back into the sealed space.

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East Hebron, NH, United States of America

David E Johnston