Abstract: A speed reducer apparatus includes an auxiliary seal assembly to inhibit ingress of particulate matter. Preferably, the seal assembly is located axially outboard of a primary seal, such as a land riding seal. The seal assembly includes a plate defining a hole through which a rotatable member extends. The hole is sized to provide a predetermined gap between the inside surface of the plate and the outside surface of the rotatable member. An annular bead member is set in place from a viscous state about the rotatable member. In particular, the annular bead member extends across the gap between the plate and the rotatable member, functioning as a dam. Methods of forming the auxiliary seal assembly are also disclosed.

Abstract: Sealing system for a housing containing gears operated in a lubricated environment, the housing having an opening through which a shaft supported in a bearing assembly extends for mating with at least one of the gears in the housing. Sealing system includes a seal arranged in the opening through which the shaft extends, the seal being located between the bearing assembly and the interior of the housing whereby the seal will be exposed to lubricant from the interior of the housing, but such lubricant will be prevented from leaking from the housing at the shaft input opening. Sealing system may also include a grease filled chamber between the seal and the bearing, and a packing gland located adjacent the bearing on the side of the bearing opposite the seal.