A housing (02) with a cylindrical inner housing wall (21) that is disposed concentrically about a cylinder axis (20) and is provided with an inner set of teeth (22). It further includes an input shaft (03), supported rotatably about the cylinder axis (20), having at least two eccentric portions (31) of identical eccentricity (32) that are disposed rotationally about the longitudinal axis (30) of the input shaft (03). Moreover, it includes an output shaft (04), supported rotatably about the cylinder axis (20), and the longitudinal axes (30, 40) of the input shaft (03) and output shaft (04) coincide with the cylinder axis (20). Furthermore, it includes at least two cycloid disks (05, 06, 07), of which each cycloid disk (05, 06, 07) is disposed rotatably about its own central rotary axis (50, 60, 70) on an eccentric portion (31) and has an outer set of teeth (51, 61, 71), meshing with the inner set of teeth (22)/ The rotary axis (50, 60, 70) of each cycloid disk (05, 06, 07) is offset by the eccentricity (32) to the cylinder axis (20), and the diameter of the cycloid disks (05, 06, 07) is dimensioned such that their outer set of teeth (51, 61, 71) in one direction comes to mesh with the inner set of teeth (22), in which direction the eccentric portion (31), on which a cycloid disk (05, 06, 07) is disposed, is pointing at the moment. Conversely, in the opposite direction, the outer set of teeth (51, 61, 71) is free of an engagement with the inner set of teeth (22), and the cycloid disks (05, 06, 07) each have reference faces (53, 63). Additionally, it includes at least one output device (08), supported rotatably about the cylinder axis (20), which output device is operatively connected to at least one cycloid disk (05, 06, 07) such that the motions of one or more cycloid disks (05, 06, 07), as they roll in the housing (02), are converted into a rotary motion of the output shaft (04). The cycloid gear (01) is distinguished by an even-numbered gear ratio i. The outer sets of teeth (51, 61, 71) of the cycloid disks (05, 06, 07) each have an even number of teeth. The inner set of teeth (22) of the housing (02) has a number of teeth N+Z or NZ that is higher or lower than a (whole) number Z.

A transmission unit comprises a planet carrier, a first hollow planet gear, a second hollow planet gear, a first ring gear, and a second ring gear. The first hollow planet gear with a first module is coupled to the planet carrier through a bearing. The second hollow planet gear with a second module different from the first module is fixed to and moving in synchronization with the first hollow planet gear. The first ring gear encircles and meshes with the first hollow planet gear. The second ring gear encircles and meshes with the second follow planet gear.

A device for winding/unwinding a link includes, but is not limited to, an input shaft and a hollow through output shaft, the two shafts being coaxial and movable in rotation about a longitudinal axis; a permanent magnet synchronous motor comprising a rotor integral in rotation with the input shaft; a cycloidal reducer comprising an eccentric cam mounted integral in rotation with the input shaft, and a cycloidal disc mounted integral in rotation with the cam, in such a way that a rotation of the cam about the longitudinal axis drives a rotation of the cycloidal disc in an eccentric and cycloidal movement; and a transmission member suitable for transmitting an angular displacement of the cycloidal disc to the output shaft.

A rotary geared actuator, comprising an input gear, an output gear, a plurality of pinions) arranged in an annular configuration about a central axis (A), each pinion including an input gear element and an output gear element, the input gear element meshingly engaged with the input gear and the output gear element meshingly engaged with the output gear, a static ring gear arranged radially outwardly of the pinions and meshingly engaged with the input gear elements of the pinions, a first support ring gear arranged radially inwardly of the pinions and meshingly engaged with the input gear element, and a second support ring gear arranged radially inwardly of the pinions and meshingly engaged with the output gear element.

One object is to provide a speed reducer provided with a buffer mechanism for reducing an external force and capable of reliably measuring a load torque during an operation. A speed reducing device includes a speed reducing mechanism for reducing a rotation speed of an output with respect to an input between an input rotary shaft and an output rotary shaft, a housing that houses the speed reducing mechanism, and a buffer unit formed of an elastic member and having a cushion force acting mainly in a substantially rotational tangential direction. An amount of displacement of the housing generated by the buffer unit is measured by a measurement device.

A dual function gearbox generates two separate output rotational motions from a single input rotational motion. First and second rotatable housings comprise corresponding first and second internal gears, with the internal gears having different pitch diameters. A drive shaft is disposed within the housings, extending though openings within opposite sides of housings, with an eccentric rotor disposed around the drive shaft. The eccentric rotor is in operative contact with a differential gear ring comprising first and second external gear rings having different diameters, with the first and second external gear rings engaging corresponding first and second internal gears. When rotational energy is imparted to one end of the drive shaft, the gearing arrangement imparts a rotational motion to either the first or second rotatable housing, with the housing rotating around the other end of the rotating drive shaft, which can extend outside of the dual function gearbox. Thus, the dual function gearbox generates two output motions: high torque rotation of the rotatable housing; and rotation of the drive shaft which can be used as an input rotation to additional dual function gearboxes.

Disclosed is a variable compression ration mechanism in which a control shaft is rotated and driven by an electric motor through a wave gear reducer. The wave gear reducer includes: a first internal gear member; an external gear member arranged concentrically inside the internal gear member; a wave generator arranged inside the external gear member; and a second internal gear member, wherein a ratio of the number of teeth of a fixed gear portion of the first internal gear member to the number of teeth of a first gear portion of the external gear member is set lower than a ratio of the number of teeth of an output-side gear portion of the second internal gear member to the number of teeth of a second gear portion of the external gear member.

A transmission unit comprises a planet carrier, a first hollow planet gear, a second hollow planet gear, a first ring gear, and a second ring gear. The first hollow planet gear with a first module is coupled to the planet carrier through a bearing. The second hollow planet gear with a second module different from the first module is fixed to and moving in synchronization with the first hollow planet gear. The first ring gear encircles and meshes with the first hollow planet gear. The second ring gear encircles and meshes with the second follow planet gear.

A gear train including a rotatable drive shaft and a clutch roller in rotatable contact with the drive shaft or mounted on the drive shaft. A first wobble gear and a second wobble gear are suspended around the drive shaft, wherein the first wobble gear is affixed to and concentric with the second wobble gear and the clutch roller is preloaded against the first and second wobble gears. A first ring gear surrounding and engaged by the first wobble gear; and a second ring gear surrounding and engaged by the second wobble gear. The ring gears being coaxial and rotatable relative to one another. The drive shaft rotates the clutch roller, which drives the first and second wobble gears, such that the wobble gears rotate around the drive shaft and at least one of the first and second ring gears rotate around the common axis.

The present application discloses a gear device provided with: 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.