A harmonic reducer includes a shaft having a first through hole extending from a first end to a second end of the shaft; a wave generator arranged on the shaft and being rotatable along with the shaft; a flexible spline arranged around the wave generator; a circular spline arranged around the flexible spline; a first flange coupled to the shaft via a first bearing and coupled to the flexible spline; and a second flange coupled to the shaft via a second bearing and coupled to the circular spline. One of the flanges is arranged near to the first end of the shaft. A cavity is provided between the one of the flanges and the first end of the shaft, such that it is in fluid communication with an external environment via the first through hole.

The disclosure provides rotary machines that include, in one embodiment, a shaft defining a central axis A, the shaft having a first end and a second end. The shaft can have a first gearbox disposed thereon defining one or more cavities therein. At least one contour is slidably received into an arcuate cavity in an exterior surface of the gearbox. The contour has a convex outer surface that cooperates with an inwardly facing curved surface of a housing to form a working volume. A gearbox mechanism consisting of gears, crankshafts, bearings and connecting rod creates an oscillatory motion 2 times per revolution such that the contour can navigate about the arcuate cavity without contacting the cavity at a high rate of rotating speed. Thus, said working volume can expand and compresses twice per rotatable shaft revolution.

An exemplary lubrication structure of a torque vectoring apparatus includes an axle housing including left-side and right-side housings disposed on left and right sides of a differential device, a left-side cover provided on an external side of the left-side housing, and a right-side cover provided on an external side of the right-side housing, where, a first space is formed between the left-side and right-side housings and provided with the differential therein, a second space is formed between the left-side housing and the left-side cover and provided with a first planetary gear set, a third space is formed between the right-side housing and the right-side cover and provided with second and third planetary gear sets, and the first, second, and third spaces are fluidically partitioned by a plurality of oil seals, and respectively filled with a lubrication oil therein.

A gear arrangement, in particular for a rotary connection of a wind turbine, comprising a first gear, a second gear in engagement with the first gear, wherein in the engaged position a gap space is provided between a first tooth and a second tooth of the first gear and a tooth of the second gear, and a sealing element which seals off the gap space to prevent lubricant escape.

Provided is a hybrid transmission structure including: a housing; a motor mounted in the housing, including a rotor and a stator, and having a first boss provided at a center of the rotor; a cover having a second boss provided at a center thereof, the second boss axially installed on a power shaft and inserted into the first boss; a support member having an inner race fixedly coupled to the second boss, and an outer race inserted into a receiving portion in the rotor, and configured to support the rotor so that the rotor is rotatable; and a sealing member positioned on the inner race of the support member and provided between the power shaft and the second boss.

The disclosure provides rotary machines that include, in one embodiment, a shaft defining a central axis A, the shaft having a first end and a second end. The shaft can have a first gearbox disposed thereon defining one or more cavities therein. At least one contour is slidably received into an arcuate cavity in an exterior surface of the gearbox. The contour has a convex outer surface that cooperates with an inwardly facing curved surface of a housing to form a working volume. A gearbox mechanism consisting of gears, crankshafts, bearings and connecting rod creates an oscillatory motion 2 times per revolution such that the contour can navigate about the arcuate cavity without contacting the cavity at a high rate of rotating speed. Thus, said working volume can expand and compresses twice per rotatable shaft revolution.

A seal structure between an oil outlet formed in a first case and an oil inlet formed in a second case and having an end face facing an end face of the oil outlet with a clearance between the end faces, the seal structure including an annular first seal disposed in an increased-diameter hole, which is formed on an outlet side or an inlet side of an oil passage in one of the oil outlet and the oil inlet and has a larger diameter than the oil passage, such that the first seal contacts a step surface located at a boundary between the oil passage and the increased-diameter hole; and an annular second seal harder than the first seal and disposed in the increased-diameter hole such that the second seal contacts the first seal and the end face of the other of the oil outlet and the oil inlet.

Various embodiments of the teachings herein include a gearbox adapter. For example, some embodiments include an adapter body with an internal cavity, a first end having a gearbox connection structure connecting the adapter body to a gearbox body, a first shaft hole in an end face of the first end providing communication between the internal cavity and an outside of the adapter body, and a second end having an opening in communication with the internal cavity; a transmission shaft configured to extend from the outside into the internal cavity via the opening and then out of the adapter body through the first shaft hole; an opening cover with a second shaft hole, the opening cover fitted at the second end to block the opening but allow the transmission shaft to pass out of the internal cavity through the second shaft hole; and a rotating bearing arranged in the internal cavity and fitted to the transmission shaft to support the transmission shaft.

The disclosure provides rotary machines that include, in one embodiment, a shaft defining a central axis A, the shaft having a first end and a second end. The shaft can have a first gearbox disposed thereon defining one or more cavities therein. At least one contour is slidably received into an arcuate cavity in an exterior surface of the gearbox. The contour has a convex outer surface that cooperates with an inwardly facing curved surface of a housing to form a working volume. A gearbox mechanism consisting of gears, crankshafts, bearings and connecting rod creates an oscillatory motion 2 times per revolution such that the contour can navigate about the arcuate cavity without contacting the cavity at a high rate of rotating speed. Thus, said working volume can expand and compresses twice per rotatable shaft revolution.

Provided is a hybrid transmission structure including: a housing; a motor mounted in the housing, including a rotor and a stator, and having a first boss provided at a center of the rotor; a cover having a second boss provided at a center thereof, the second boss axially installed on a power shaft and inserted into the first boss; a support member having an inner race fixedly coupled to the second boss, and an outer race inserted into a receiving portion in the rotor, and configured to support the rotor so that the rotor is rotatable; and a sealing member positioned on the inner race of the support member and provided between the power shaft and the second boss.