A turbomachine engine according to aspects of the present disclosure is provided. The engine includes a fan assembly including a plurality of fan blades, and a core engine surrounded by an outer casing. The core engine includes a power output component operably connected to the fan assembly, a first input power source and a second input power source. The first input power source is counter-rotatable relative to the second input power source. The core engine includes a gear assembly operably connected to the power output component and configured to receive power from the first input power source and the second input power source.

An aircraft includes first and second engines, one or more aircraft rotors associated with the first and second engines, a first epicyclic gearbox having: a) an output operatively connected at least one of the one or more aircraft rotors, and b) an input defined by a sun gear of the first epicyclic gearbox; and a second epicyclic gearbox having: a) an output operatively connected to at least one of the one or more aircraft rotors, and b) an input defined by a sun gear of the second epicyclic gearbox. Output of the first epicyclic gearbox is defined by the carrier. Output of the second epicyclic gearbox is defined by its ring gear. A multi-engine aircraft and a method of operating a multi-engine aircraft are also described.

A planetary gear actuator including a sun gear, a rotary internal gear being concentric with the sun gear, a fixed internal gear being concentric with the sun gear, compound planetary gears, and a carrier connected to each of the compound planetary gears so as to be rotatable relative to each of compound planetary gears may be provided, Each of the compound planetary gears may include a first planet gear engaged with the sun gear, a second planet gear at one side of the first planet gear, engaged with the rotary internal gear, and having a smaller number of teeth than the first planet gear, and a third planet gear at another side of the first planet gear, engaged with the fixed internal gear, and having a smaller number of teeth than the first planet gear. One compound planetary gear may overlap another compound planetary gear in a thickness direction.

A reduction drive assembly includes a housing and a flange. Outer surfaces of the spindle and the flange form at least one fillet corner. A motor output shaft extends through an aperture of the spindle. The reduction drive assembly includes a planetary gear assembly that includes a sun gear driven by the motor output shaft and gears. The reduction drive assembly includes a fixed ring gear that is meshed with a second stage gear of each of the planet gears, an output hub, a rotating ring gear coupled to the output hub and meshed with a first stage gear of each of the planet gears, a set of bearings positioned radially between the spindle and the output hub and axially between the fixed ring gear and the flange of the housing, and a spacer ring positioned between the set of bearings and adjacent the at least one fillet corner.

A pulling tool for use in a wellbore or tubing for pulling cable includes a propulsion module having a main section and a propulsion arm hinged to the main section. The propulsion arm includes a complete propulsion wheel with a gear system. An electric motor is configured to drive the complete propulsion wheel via the gear system. The gear system may include a harmonic gear or a compound split ring epicyclic gear.

The present invention relates to an equidirectional transfer universal transmission formed by connecting an equidirectional transfer case, a commutator, and an actuator. One of five types of planetary gear trains is used for the equidirectional transfer case, the component corresponding to a term having a maximum absolute value of a coefficient in a motion characteristic equation is used as an input end, and the other two components are respectively used as an inner output end and an outer output end. The commutator includes fourth types of quill shaft commutators and a non-quill shaft commutator, which are set by respective methods. One of two types of single-layer planetary gear trains is used for the actuator. The present invention includes methods for setting respective components of the equidirectional transfer case and the actuator, and includes a connection method. According to the present invention, an output shaft is controlled to revolve around an actuator shaft by inputting a revolving speed, a forward moment and a reverse moment are balanced during revolving, the output shaft has no unidirectional bearing moment, and a revolving control device has a simple structure.

Provided is a dual clutch transmission. First and second input shafts are mounted concentrically. First and second output shafts are mounted in parallel to the first input shaft and respectively include output gears engaged with a ring gear of a differential. The rotations of first and second gears are restrained by the first input shaft. The rotations of third and fourth gears are restrained by the second input shaft. The rotations of fifth and sixth gears engaged with the second and third gears, respectively, are restrained by the first output shaft. The rotation of a seventh gear engaged with the first gear is restrained by the second output shaft. An eighth gear is engaged with the second gear to be rotatable about the second output shaft. The rotation of a ninth gear engaged with the fourth gear and restrained by the eighth gear is restrained by the second output shaft.

An aircraft includes first and second engines, one or more aircraft rotors associated with the first and second engines, a first epicyclic gearbox having: a) an output operatively connected at least one of the one or more aircraft rotors, and b) an input defined by a sun gear of the first epicyclic gearbox; and a second epicyclic gearbox having: a) an output operatively connected to at least one of the one or more aircraft rotors, and b) an input defined by a sun gear of the second epicyclic gearbox. Output of the first epicyclic gearbox is defined by the carrier. Output of the second epicyclic gearbox is defined by its ring gear. A multi-engine aircraft and a method of operating a multi-engine aircraft are also described.

The present invention relates to an equidirectional transfer universal transmission formed by connecting an equidirectional transfer case, a commutator, and an actuator. One of five types of planetary gear trains is used for the equidirectional transfer case, the component corresponding to a term having a maximum absolute value of a coefficient in a motion characteristic equation is used as an input end, and the other two components are respectively used as an inner output end and an outer output end. The commutator includes fourth types of quill shaft commutators and a non-quill shaft commutator, which are set by respective methods. One of two types of single-layer planetary gear trains is used for the actuator. The present invention includes methods for setting respective components of the equidirectional transfer case and the actuator, and includes a connection method. According to the present invention, an output shaft is controlled to revolve around an actuator shaft by inputting a revolving speed, a forward moment and a reverse moment are balanced during revolving, the output shaft has no unidirectional bearing moment, and a revolving control device has a simple structure.

A speed reducer drive can drive an output relative to a fixed ring using planet rollers having different diameter in contact with the output and fixed ring. Elements of the device can be formed of axially arranged segments for ease of construction. Backlash may be removed by manipulation of the drive before tightening segments of the rollers to fix the segments together by friction. The rolling contacts between elements can include a mix of geared contacts for better torque and ungeared contacts to act as bearing surfaces. Geared or ungeared surfaces may be tapered. Elements may be axially adjustable relative to each other, allowing backlash to be removed in combination with taper.