Abstract: A seal includes an annular body defining an opening for a shaft. At least one sealing lip is connected to an inner wall of the body and projects inwardly toward a central axis. The one or more sealing lips each include an outer edge connected to the inner wall of the body and an inner edge that is spaced inwardly toward the central axis. Each sealing lip extends helically about the central axis. If multiple sealing lips are provided, each extends helically about the central axis with the same orientation but they are axially offset with respect to each other. One or more helically extending lubricant channels are defined by the helical sealing lip(s) and pump lubricant inwardly upon relative rotation between the seal and shaft. An optional debris lip is located between the flexible sealing lip(s) and the front face of the seal body to inhibit ingress of contaminants.

Abstract: A seal includes an annular hub and an annular sealing projecting outwardly from the hub. The sealing lip includes an inner portion located adjacent the hub and an outer portion spaced from the hub. The outer portion defines a nose. The seal includes a hinge portion formed as a one-piece construction with the hub and the sealing lip, and the hinge portion pivotably interconnects the sealing lip to the hub so that the sealing lip is selectively manually movable to and between: (i) an operative position, where the nose is located axially outward of the second axial end of the hub; and, (ii) a non-operative installation position, where the lip is located axially inward of the second axial end of the hub. The hinge portion biases the sealing lip away from the operative position when the sealing lip is moved to the non-operative position, and the hinge portion biases the sealing lip away from the non-operative position when the sealing lip is moved to the operative position.