A ducted-rotor aircraft includes a fuselage, first and second ducts, and a spindle that is coupled to the fuselage. Each duct includes a rotor having a plurality of blades. The first and second ducts are coupled to opposed ends of the spindle. The spindle is rotatably coupled to the fuselage with first and second bearings. The first bearing is configured to react to radial loads and the second bearing is configured to react to both radial and axial loads. The spindle includes a shaft, first and second fittings secured to opposed ends of the shaft, and first and second attachment interfaces that are attachable to the first and second ducts. The attachment interfaces may be integral with the fittings. Alternatively, the fittings may be configured to be secured to the attachment interfaces with fasteners.

A free-wheel comprising a driving part and a driven part that are able to rotate about an axis of rotation, the free-wheel comprising at least one rotational connecting member arranged in a connection space, a driven connection section of the driven part surrounding a driving connection section of the driving part, the connection space being located radially, with respect to the axis of rotation, between the driving connection section and the driven connection section. The free-wheel comprises at least one barrier, the geometry of which varies depending on the speed of rotation of the driving part, arranged radially between the driving part and the driven part and longitudinally against the connection space, the barrier being constrained to rotate with the driving connection section.

Bearing unit providing a housing and at least one bearing mounted in the housing. The bearing unit includes at least one load sensing element and at least one vibration sensing element fixed on the housing.

A disconnection assembly has a one-way clutch. The one-way clutch serves to either connect or disconnect the power connection of a vehicle. The disconnection assembly is installed in a reducer including an intermediate shaft, a bushing, an outer gear and a one-way clutch. The bushing is secured to the intermediate shaft by spline. The one-way clutch is disposed between the bushing and the outer gear. The one-way clutch is locked to drive the rotation of the intermediate shaft through the bushing when the outer gear rotates in a first direction, and the one-way clutch is released to allow the outer gear rotates freely when the outer gear rotates in a second direction.

A disconnection assembly has a one-way clutch. The one-way clutch serves to either connect or disconnect the power connection of a vehicle. The disconnection assembly is installed in a reducer including an intermediate shaft, a bushing, an outer gear and a one-way clutch. The bushing is secured to the intermediate shaft by spline. The one-way clutch is disposed between the bushing and the outer gear. The one-way clutch is locked to drive the rotation of the intermediate shaft through the bushing when the outer gear rotates in a first direction, and the one-way clutch is released to allow the outer gear rotates freely when the outer gear rotates in a second direction.

A hub structure includes an axle housing, a hub having an insertion hole in a vehicle width direction through which the axle housing is inserted, and an inner bearing disposed between the hub and the axle housing in the insertion hole and rotatably supporting the hub with respect to the axle housing, and an oil seal disposed between the hub and the axle housing in the insertion hole on an inner side relative to the inner bearing in the vehicle width direction. A spacer is provided between the inner bearing and the oil seal in the insertion hole. The spacer has an outer end surface that is contactable with an inner end surface of an inner race of the inner bearing.

A bearing chamber housing for supporting a shaft of a turbomachine is provided, the bearing chamber housing including an additively built-up housing wall which bounds an oil chamber of the bearing chamber housing radially outwardly relative to an axis of rotation of the shaft, the housing wall being built up with an oil duct which has an inlet opening toward the oil chamber for admission of oil from the oil chamber into the oil duct, and which has an outlet opening for discharging the oil from the oil duct, the outlet opening being located at a different axial position and at a different circumferential position than the inlet opening, considered relative to the axis of rotation of the shaft, and the oil duct having an extent with both an axial component and a circumferential component, at least over a portion thereof.

A rotary table device includes a table provided on one end-side of a main shaft rotatably supported in a frame; and a drive transmission mechanism transmit rotation of an output shaft of a drive motor to the main shaft and including a drive transmission member and accommodated in an accommodation space formed in the frame. The table is supported with respect to the frame by a bearing provided between a lower surface of the table and an upper surface of the frame, and a space is provided between the lower surface of the table and the upper surface of the frame. The frame is provided with a communication passage configured so that the space and the accommodation space communicate with each other.

A rotary table device includes a table provided on one end-side of a main shaft rotatably supported in a frame; and a drive transmission mechanism transmit rotation of an output shaft of a drive motor to the main shaft and including a drive transmission member and accommodated in an accommodation space formed in the frame. The table is supported with respect to the frame by a bearing provided between a lower surface of the table and an upper surface of the frame, and a space is provided between the lower surface of the table and the upper surface of the frame. The frame is provided with a communication passage configured so that the space and the accommodation space communicate with each other.

A gear device includes an outer cylinder; an internal member at least partially housed in the outer cylinder and configured to rotate relative to the outer cylinder about a predetermined rotation axis; a first main bearing fitted into an annular space formed between the outer cylinder and the internal member; and a second main bearing fitted into the annular space and configured to define the rotation axis in cooperation with the first main bearing. A distance between a first intersection where a load action line of the first main bearing intersects with the rotation axis and a second intersection where a load action line of the second main bearing intersects with the rotation axis is set to fall within a range expressed by a predetermined inequality expression.