A sealing device includes a first sealing member and a second sealing member that are mounted on a housing, the outer peripheral surface of the rotational shaft being in slidable contact with the first sealing member and the second sealing member. Distal portions of multiple first hooks formed on the first sealing member are hooked on the distal portions of multiple second hooks formed on the second sealing member for restricting movement of the second sealing member away from the first sealing member in the axial direction of the sealing device. Distal portions of multiple first stoppers formed on the first sealing member are in contact with the distal portions of multiple second stoppers formed on the second sealing member for restricting movement of the second sealing member toward the first sealing member in the axial direction.

A sealing device acts to seal a gap between a housing of a gear reducer and a rotational shaft that bi-directionally rotates, and separates an internal space of the housing in which a grease is stored from an atmosphere side. The sealing device includes a main seal lip protruding radially inward from an inner peripheral surface of an inner cylindrical portion. The main seal lip has an internal-side inclined surface disposed on a side of the internal space and an atmosphere-side inclined surface disposed on the atmosphere side. An auxiliary seal lip protrudes radially inward and toward the internal space from the internal-side inclined surface of the main seal lip. Multiple first spiral structures and multiple second spiral structures are formed on at least one of the atmosphere-side inclined surface of the main seal lip and an inner peripheral surface of the auxiliary seal lip.

A strain wave gearing has a lubricant sealing structure that prevents a lubricant from leaking to the outside through a gap portion between a hollow input shaft and an end plate. The lubricant sealing structure includes an oil-repellent surface formed on the surface portion facing the gap portion, an oil seal that seals the gap portion, and an oil film forming surface formed at a lip tip surface of the oil seal. The oil-repellent surface has a surface texture in which first fine grooves are formed in a predetermined pattern so that an oil-repellent effect can be obtained with respect to the lubricant. The oil film forming surface has a surface texture in which second fine grooves are formed in a predetermined pattern so that an oil film forming effect of a seal lip grease can be obtained.

A radial shaft seal for a shaft to be sealed operating at high rotational speeds and circumferential speeds in both rotational directions has a sealing lip with a first circumferential ring and a second circumferential ring. The first circumferential ring is resting seal-tightly against the shaft to be sealed and seals the medium side. At the side of the first circumferential ring facing the air side, there are first return elements that convey leakage medium back to the medium side. The second circumferential ring is provided at the side of the first circumferential ring facing the air side and second return elements are provided at its air side. The second return elements guide medium that has passed underneath the second circumferential ring back underneath the second circumferential ring to the medium side.

A radial shaft seal for a shaft to be sealed operating at high rotational speeds and circumferential speeds in both rotational directions has a sealing lip with a first circumferential ring and a second circumferential ring. The first circumferential ring is resting seal-tightly against the shaft to be sealed and seals the medium side. At the side of the first circumferential ring facing the air side, there are first return elements that convey leakage medium back to the medium side. The second circumferential ring is provided at the side of the first circumferential ring facing the air side and second return elements are provided at its air side. The second return elements guide medium that has passed underneath the second circumferential ring back underneath the second circumferential ring to the medium side.

A transmission (G) for a motor vehicle includes a housing (GG), a shaft (W, GW2, DS1, DS2) mounted in the housing (GG) and protruding from the housing (GG), a radial shaft seal (DR) having a sealing lip for sealing an oil space (NR) within the housing (GG) with respect to an exterior, a shaft grounding device (E) arranged on an exterior side of the radial shaft seal (DR) for establishing an electrically conductive sliding contact (SK) between the shaft (W, GW2, DS1, DS2) and the housing (GG), and a sleeve-shaped covering element (C) fixedly connected to the shaft (W, GW2, DS1, DS2) for protecting the sliding contact (SK) against environmental influences. The shaft grounding device (E) is fixedly connected to the housing (GG). The covering element (C), together with the grounding device (E), forms a labyrinth sealing. An electric axle drive (EA) may include the transmission (G).

A transmission (G) for a motor vehicle includes a housing (GG), a shaft (W, GW2, DS1, DS2) mounted in the housing (GG) and protruding from the housing (GG), a radial shaft seal (DR) having a sealing lip for sealing an oil space (NR) within the housing (GG) with respect to an exterior, a shaft grounding device (E) arranged on an exterior side of the radial shaft seal (DR) for establishing an electrically conductive sliding contact (SK) between the shaft (W, GW2, DS1, DS2) and the housing (GG), and a sleeve-shaped covering element (C) fixedly connected to the shaft (W, GW2, DS1, DS2) for protecting the sliding contact (SK) against environmental influences. The shaft grounding device (E) is fixedly connected to the housing (GG). The covering element (C), together with the grounding device (E), forms a labyrinth sealing. An electric axle drive (EA) may include the transmission (G).

A hydrodynamic seal (10) for use with a rotating shaft (24) is disclosed. The seal includes a face seal (20) and a mating ring (22) fixed or connected to rotate with the shaft. A clamping nut (30) is adjacent to the mating ring and includes threads to secure a portion of the clamping nut to the shaft via a threaded interface (32). Embodiments of the seal and related assembly include at least one of: a spring component (140) with or on the clamping nut; a clamping surface (150) on an interface between the mating ring and the clamping nut, the clamping surface being substantially parallel to a thread pitch on the threaded interface; and a pilot surface (250) on the clamping nut.

A hydrodynamic seal (10) for use with a rotating shaft (24) is disclosed. The seal includes a face seal (20) and a mating ring (22) fixed or connected to rotate with the shaft. A clamping nut (30) is adjacent to the mating ring and includes threads to secure a portion of the clamping nut to the shaft via a threaded interface (32). Embodiments of the seal and related assembly include at least one of: a spring component (140) with or on the clamping nut; a clamping surface (150) on an interface between the mating ring and the clamping nut, the clamping surface being substantially parallel to a thread pitch on the threaded interface; and a pilot surface (250) on the clamping nut.

A bearing isolator seal provides enhanced coupling and stability of the rotor to the shaft, without undue seal enlargement, by including a plurality of drive O-rings in a common retention groove. In embodiments, the isolator seal accommodates axial rotor misalignment up to a maximum permitted axial misalignment, which can be at least 0.025″. Embodiments include a labyrinth passage between the rotor and the stator configured to expel fluid by centrifugal force. Embodiments include a shut off feature that takes advantage of axial misalignment. Some embodiments include a unitization feature that holds the rotor and stator together during assembly. The unitization feature can include chamfers on rotor and stator extensions that facilitate assembly and disassembly when sufficient force is applied.