Abstract: An accumulator piston is formed as a two-piece plastic molding for simplifying its construction and for cost reduction and weight reduction purposes. The piston has a radially stepped construction in which each step includes a radial flange carrying an annular elastomeric sealing element. The sealing elements have deformable, resilient lips which slidably engage the side surfaces of a stepped cylinder in which the piston reciprocates. One of the elastomeric sealing elements is molded to an annular insert member that is seated in an annular recess formed in one end of the main piston body. The two-piece piston construction facilitates installation and removal of mold cavity members relative to the respective elastomeric sealing elements such that the mold cavity members can be of simplified economical construction.

Abstract: A fluid seal made of elastomeric material for use between an external stationary member and a rotating internal member avoids use of a customary pressed steel case. The seal may be stretched over an external flange on a rotatable shaft and recover from the elongation to the designed dimension at which the seal is to operate within the external stationary member. A specially formulated elastomeric composition accommodates elongation during stretching in excess of 300%.

Abstract: A fluid seal made of elastomeric material for use between an external stationary member and a rotating internal member avoids use of a customary pressed steel case. The seal may be stretched over an external flange on a rotatable shaft and recover from the elongation to the designed dimension at which the seal is to operate within the external stationary member. A specially formulated elastomeric composition accommodates elongation during stretching in excess of 300%.

Abstract: A unitized grease seal. The seal member has a one-piece metal case having a cylindrical bore-sealing portion and a radial flange, and a molded elastomeric member bonded to the metal case to provide a portion bonded to the radial flange and an outer generally cylindrical portion bonded to the surface of the bore-sealing portion and providing a series of spaced apart inwardly extending retaining portions. The elastomeric member also has two diverging lip portions with a cavity between them, one providing a grease retention lip having small spaced-apart shallow indentations enabling passage of small amounts of grease into the cavity, the other lip portion having a polytetrafluoroethylene insert bonded thereto.

Abstract: A fluid seal for use between a stationary member and a rotating member. A rigid member mounted on the stationary member has a peripheral cylindrical portion joined to a peripheral frustoconical portion. A sealing assembly mounted on the rotating member has a supporting case and a radial flange. An elastomeric body is bonded to the flange and has, to one side of the flange, a radially outwardly projecting frustoconical auxiliary lip engaging the peripheral cylindrical portion. A main sealing lip, comprising an annular, flexible, polytetrafluoroethylene planar wafer, is bonded to the body on the other side of the flange from the auxiliary lip. This main lip extends radially outwardly, the wafer normally tending to assume a substantially radial position. One face of the wafer engages and is flexed by the frustoconical portion. The centrifugal force of the rotating member in either direction tends to urge the lips more snugly against the rigid member.

Abstract: A rotary bidirectional dynamic shaft seal (10) for maintaining a seal about a rotating shaft (12) to prevent the leakage of oil from the oil side of the seal past a sealing edge (18) to the air side. The seal (10) includes a plurality of pumping projections extending from the frustoconical surface (22) on the air side of the seal for pumping oil, which may leak past the sealing edge (18) back to the oil side of the seal. The pumping projection has a primary pumping surface (24) extending axially from the sealing edge (18) and a secondary pumping surface (28) extending at a shadow angle (A) away from the primary pumping (24) surface to a return surface (26) which extends generally radially to define the rear extremity of the pumping projection. Under normal operating conditions, the primary pumping surface (24) will return oil to the oil side of the sealing edge (18).