A magnetic coupling device includes a driving magnet array having multiple annular sector-shaped, circumferentially arranged first permanent magnets, and a driven magnet array having multiple circular sector-shaped, circumferentially arranged second permanent magnets with pole surfaces facing pole surfaces of the first permanent magnets. The driven magnet array is rotated by the driving magnet array being rotated. A repulsion zone where a repulsive force acts is designed to have an area that is 5% to 15% of that of an attraction zone where an attractive force acts between a specific first permanent magnet and a specific second permanent magnet, with a radial first centerline of the specific first permanent magnet overlapping a radial second centerline of the specific second permanent magnet so that opposite poles face each other, including between first and second permanent magnets respectively adjacent the specific first and second permanent magnets with overlapping the centerlines.

A relieving portion is formed between a first external tooth portion and a second external tooth portion in the external teeth of a flexible externally toothed gear of a flat strain wave gearing. The length L1 of the relieving portion in the tooth trace direction is within the range of 0.1 to 0.5 of the tooth width L of the external teeth. The maximum relieving amount t from the tooth top land of an external tooth in the relieving portion is 3.3×10.sup.−4<t/PCD<6.3×10.sup.−4 where the PCT is defined as the pitch circle diameter of the external teeth. The tooth face load distribution of the external tooth in the tooth trace direction can be equalized, and a flat strain wave gearing having a high transmitted-load capacity can be achieved.

An actuator, a robot arm and a robot are disclosed. The actuator includes: a housing; a motor, including a motor stator and a motor rotor, wherein the motor stator is disposed on the housing, the motor rotor is rotatably connected to the housing, and the motor rotor covers the motor stator; a position encoder, disposed on the motor rotor; a motor driver, disposed on the housing, and electrically connected to the motor; a reducer, disposed on the housing, and parallelly disposed with the motor; and a transmission mechanism, connected to the motor rotor and the reducer respectively; wherein the reducer is configured to adjust a rotation speed output from the motor rotor.

A reduction drive-side mounting end face on a strain wave gearing reduction drive unit has a circular center hole, and a motor-side mounting end face on a motor has a circular projection. The strain wave gearing reduction drive unit and motor are coaxially mounted by the circular projection being fit into the circular center hole with a regulating ring therebetween. The regulating ring, which regulates the motion of a flexible external gear, can be easily mounted to the strain wave gearing reduction drive unit by using the motor. The strain wave gearing reduction drive unit can be mounted to a motor comprising a circular projection with a different outer diameter by using a regulating ring with a different inner diameter.

A roll stabilizer for a motor vehicle having a housing (137, 237) with a first stabilizer element (110, 210) coupled to the housing and an electric motor (150, 250) located in the housing (137, 237). The transmission (160, 260) is coupled to the electric motor (150, 250) on a drive side, and the output side of the transmission (160, 260) is coupled to a second stabilizer element (115, 215) such that the stabilizer elements are electromechanically rotatable with respect to one another. The electric motor is designed as a Vernier motor.

The invention provides an actuating device for actuating a cable. The actuating device comprises a housing defining an interior and a motor assembly including a shaft. The actuating device also comprises at least two planetary gears and a flex gear having an inner surface and an outer surface with the inner surface partially engaged with the planetary gears. The actuating device additionally comprises an output member having a drive portion and a mounting interface with the drive portion engaged with a section such that the output member is rotatable relative to the housing when the shaft rotates. The actuating device additionally comprises a connector coupled to the mounting interface for securing the cable to the mounting interface. The connector moves relative to the housing and in unison with the output member during the rotation of the output member for activating the cable during operation of the actuating device.

A fusion gear reducer includes a first-stage gear reduction unit and a second-stage gear reduction unit both in a housing. The first-stage gear reduction unit includes a sun gear, a planet gears support, planet gears spaced around the sun gear and meshed therewith, and a ring gear around the planet gears and meshed therewith. The second-stage gear reduction unit includes spaced rollers arranged as a circle, roller grooves, wells formed on an inner surface of the housing, and a cam surface formed on an outer surface of the ring gear so that the ring gear is output of the first-stage gear reduction unit and input of the second-stage gear reduction unit. The roller grooves are disposed on outer surfaces of the planet gears so that the planet gears are output of the second-stage gear reduction unit. The simplified fusion gear reducer solves the problem of bulkiness of gear reducer.

A flex spline torque transfer device using force applied at multiple positions for each area of contact between the flex spline and outer ring. The positions of at which force is applied may be outside the areas of contact. This design may also be used in conjunction with a magnetic method of applying force to the flex spline, mechanical force acting as a constraint to prevent the flex spline from fully disengaging from the outer ring.

A gearbox that is configured to transmit torque from a motor shaft to a load shaft includes a limit mechanism The limit mechanism includes a strain wave gear including a circular spline, a flex spline and a wave generator. The circular spline is fixed to a housing of the gearbox coaxially with the load shaft, the flex spline is formed on a flexible rim of a rotatable cup that is coaxial with the load shaft, and the wave generator is coupled to the load shaft so as to rotate at the same angular velocity. The limit mechanism further includes at least one limiter structure coupled to the rotatable cup and at least one fixed switch, and is configured to stop rotation of the load shaft when the limiter structure engages the fixed switch.

A disc recliner 18 for a seat assembly includes a fixed plate 22 secured to a seat cushion 12 and a rotatable plate 30 secured to a seat back 14. Each of the fixed and rotatable plates 22,30 has a plurality of teeth 40,48, the number of teeth not being equal. A flex spline 26 has a plurality of teeth 52, the number of teeth being equal to the number of teeth on the fixed plate 22. A wave generator 28 causes a portion of the teeth 52 on the flex spline 26 to meshingly engage with the teeth 40,48 on the fixed and rotatable plates 22,30. Rotation of the wave generator 28 causes the teeth 52 on the flex spline 26 which meshingly engage with the teeth 40,48 on the fixed and rotatable plates 22,30 to change, thereby causing the rotatable plate 30 to rotate relative to the fixed plate 22, which in turn causes the seat back 14 to pivot relative to the seat cushion 12