An electric motor includes a cylindrical wound stator assembly forming a free interior space and a rotor assembly guided inside the interior space. The reduction gear is inside a housing secured to the stator assembly and having a movable gearing assembly. The output of the movable gearing assembly is secured to a movement output shaft. The input element of the movable gearing is driven by the rotor assembly extending inside the housing. The gear motor comprises a guide element of the output shaft. The output shaft is extended inside the motor up to a guide element located at least partly inside the stator assembly having the rotor assembly which is guided by a guide means positioned between the inner surface of the rotor assembly and a surface of the output shaft.

A circular wave drive system is provided. In one aspect, the drive comprises: a compliant input ring gear, wherein input ring gear includes internal input ring gear teeth; an input cycloidal disc having an outer surface, wherein the input cycloidal disc includes external input cycloidal disc gear teeth, and wherein the external gear teeth engage the internal gear teeth; a compliant primary drive gear having an outer surface, wherein the primary drive gear includes external primary drive gear teeth; an eccentric motion generator having an eccentric portion and a non-eccentric portion and wherein a centerline of the eccentric portion and the non-eccentric portion are offset, and wherein the eccentric motion generator includes a hollow central bore; and an output cycloidal disc, wherein the output cycloidal disc includes internal output cycloidal disc teeth, and wherein the internal output cycloidal disc teeth engage the external primary drive gear teeth.

An electric drive module and an electric drive equipment are provided, the electric drive module comprises a housing, a force output assembly, a flexible gear, a rotor, a stator, a wave generator, and a cooling pipe, the stator is configured to drive the rotor to rotate relative to the housing, when the rotor rotates, the wave generator drives the flexible gear to deform to drive the rigid gear to rotate, at least part of the cooling pipe is received in and closes to the stator. The electric drive module is compact and space saving, the flexible gear is secured to the housing, the rotation of the rigid gear driven by the deformation of the flexible outputs power, which is low rotational inertia and decreases vibration, the cooling pipe arranged in the stator can directly dissipate heat from the stator with high heat dissipation efficiency.

Harmonic drives (HDs) are used widely in robotics as a method for achieving high gear reductions and for driving force transmissions. The HD is made a three components: a wave generator, a flexspline, and a circular spline. Low-cost wave generators for metal strain wave gearing are provided. Wave generators are provided that incorporate commercially available bearings that form an ellipse either statically or through adjustment. Wave generators are optimized to maximum performance, including increasing the efficiency and the lifetime, while maximizing the running torque. The shape, size, number, type and location of the bearings can be changed so that the wave generator fails at a similar lifetime as a low cost flexspline. The shape of the wave generator may be adjusted to change the performance of the strain wave gear. The combination of low-cost flexsplines with low-cost wave generators reduces the cost of the strain wave gear.

A strain wave gearing device has a grease temperature control mechanism for controlling the grease temperature of a portion of grease, of the grease filled inside an externally toothed gear of the strain wave gearing device, the portion of the grease being disposed on the outer peripheral side portion of a wave generator. The grease temperature control mechanism has a circular heater facing the outer peripheral side portion of the wave generator over the entire circumference from a direction of a device central axis line. By controlling the grease temperature of a specified portion inside the externally toothed gear, it is possible to reliably start the strain wave gearing device even in an extremely low temperature environment where the grease solidifies.

A gear device includes an internal gear, an external gear, and a wave generator. The external gear includes a cylinder section including external teeth, a diaphragm extending to a radial direction outer side of the cylinder section on the opposite side of the external teeth, and an annular boss section coupled to the outer circumferential end side of the diaphragm. The thickness of the diaphragm gradually decreases from the outer circumferential end toward a center portion in the radial direction of the diaphragm. In a natural state, a part (an inclination start part) where a first surface on the external teeth side of the diaphragm starts to incline with respect to an imaginary surface, which is a surface perpendicular to a rotation axis, is present further on the cylinder section side in the radial direction than the inner circumferential surface of the boss section.

An automatic actuator system is provided. The automatic actuator system includes an input linkage that receives an input and an output linkage adapted to control a flight surface actuator. The automatic actuator system includes a first strain wave gear having a first circular spline coupled to the input linkage and a first flex spline rotatably coupled to the first circular spline. The automatic actuator system includes a second strain wave gear having a second circular spline coupled to the first flex spline. The second strain wave gear includes a second flex spline, and the second flex spline is coupled to the output linkage such that at least a portion of the input from the input linkage is transferred to the output linkage via the first strain wave gear and the second strain wave gear.

A fluid rotary joint has a stator with a generally curved stator body and a flex spline with a flexible annular band disposed about and secured to the stator body. The stator also has at least three radially extendable members disposed between the stator body and the annular band to deform the annular band away from the stator body to contact the inner surface of a rotor. The inner circumference of the rotor is greater than the outer circumference of the annular band. A driver selectively expands the extendable members and brings the annular band of the stator into frictional driving engagement with the rotor for rotating the rotor. The extendable members may also be selectively extended to allow the stator and rotor to freely move with respect to one another or to have limited contact with one another to act as a torque limiting device.

A method of making a strain wave includes the steps of a) providing a circular spline, a flexspline meshed with the circular spline, and an initial wave generator having an initial outer profile of a standard ellipse with a perimeter S.sub.0, and b) producing a modified wave generator rotatably fitted within the flexspline and having a modified outer profile with a perimeter S. A difference E.sub.S between the perimeter S of the modified outer profile and the perimeter S.sub.0 of the initial outer profile satisfies the equation E.sub.S=S−S.sub.0=0.1 m to 0.8 m, wherein m is the modulus of the flexspline. Through a special parameter design of the modified wave generator, the meshing ratio between the circular spline and the flexspline is increased, thereby improving the transmission accuracy and reducing the average load.

A coaxial gear (1), includes an axially oriented tooth system (5) with respect to a rotational axis (3) of the coaxial gear (1), a tooth carrier (7) having axially oriented guideways (9), tooth pins (11) received within the guideways (9) for engaging with the tooth system (5), wherein the tooth pins (11) are axially oriented within the guideways (9) by their respective longitudinal axes and are mounted within the guideways (9) in an axially displaceable manner, and a cam disc (15) rotatable about the rotational axis (3) for axially driving the tooth pins (11), wherein a plurality of bearing segments (17) is disposed between the cam disc (15) and the tooth pins (11) for bearing the tooth pins (11), and wherein, on a side facing the tooth pins, the bearing segments (17) have an elevation at least in sections formed as a spherical cap for bearing the respective tooth pin (11).