Abstract: A planetary gear train including a ring gear defining a central axis; a plurality of planet gears, each planet gear being rotatable about a respective planet axis and meshing with the ring gear, and each planet gear including a conical and helical planet gear toothing defining a conical direction; a planet carrier rotationally supporting the planet gears for rotation about the planet axes, the planet carrier being axially displaceable along the central axis; and a carrier forcing device arranged to force the planet carrier along the central axis in the conical direction. A gearbox for an industrial robot, the gearbox including a planetary gear train, and an industrial robot including a planetary gear train or a gearbox, are also provided.

Abstract: A rotary hydraulic machine with radial pistons comprising: a rotating shaft (2); a cylinder-housing body (3), having a plurality of housing seatings (4) arranged radially at equal distances from the rotation axis (R) of the rotating shaft (2); a cylinder (5) housed in each of said plurality of housing seatings (4) and rotating relative to the same around an axis (C) concentric with said rotation axis (R) of the rotating shaft (2); a piston (6) slidable in each cylinder (5) and coupled to a crank (7) of the rotating shaft (2); a supply conduit (12), for each cylinder (5), provided with a seal (120) arranged to enable a sealed connection between the supply conduit (12) and the respective cylinder (5).

Abstract: A cutting instrument comprising: an outer tube comprising a distal end and a proximal end; an inner tube rotatably disposed within said outer tube, said inner tube comprising a distal end, a proximal end and a region intermediate said distal end and said proximal end, said region comprising a plurality of slits formed in said inner tube so as to render said region of said inner tube flexible; and a bellows disposed adjacent to said plurality of slits so as to render said region of said inner tube fluid-tight.

Abstract: In one aspect, a drill bit is disclosed that in one embodiment may include a bit body, a rotating cutter on the bit body, and a metallic seal between the bit body and the rotating cutter that includes a first seal member, a second seal member having a first end in sealing contact with the first seal member, a second end fixed relative to the first end and a bias member between the first end and the second end that adjusts the load on the first seal member in response to external load applied on the drill bit.

Abstract: An earth boring bit has a bit body with a depending bearing pin, a cone rotatably mounted on the bearing pin, a seal gland between the cone and the bearing pin, and a seal assembly located in the seal gland. The seal assembly includes an annular metallic spring encircling the bearing pin. The spring has a geometric center line that extends in a circle around the bearing pin. The spring is elastically deformable in radial directions relative to the center line. An elastomeric layer is located on an exterior side of the spring and is biased by the spring against a surface of the seal gland.

Abstract: A seal ring having a frustoconical spring completely encapsulated within an annular body provides a bias force to an annular lip seal of the annular body to assure positive contact with an opposed face of an adjacently disposed member of a joint assembly. The seal ring requires minimal counterbore depth in the member in which the seal ring is mounted, and no modifications are required in the spring or in the base of the counterbore to provide retention of the spring in the joint.

Abstract: A liquid seal unit having a seal ring with an annular end face cooperating with a seal mating ring on an associated component to form a liquid-tight dynamic seal. A composite multi-functional member with a flexible finger spring embedded in a unitary elastomeric body urges the seal ring and the mating ring together. The spring has an annular continuous outer body portion and a plurality of circumferentially spaced apart, radially inwardly extending flexible spring fingers. The unitary elastomeric body includes radially spaced, first and second annular load bearing formations that extend in axially opposite directions. The elastomeric body still further includes an axially extending sealing ring positioning collar lying radially between the load bearing formations and having an inner surface that engages a seating surface in the seal ring to provide a secondary seal.