The invention describes a device for winding/unwinding a link, comprising: an input shaft (10) and a hollow through output shaft (20), the two shafts being coaxial and movable in rotation about a longitudinal axis (L), a permanent magnet synchronous motor (30) comprising a rotor (31) integral in rotation with the input shaft (10), a cycloidal reducer (50) comprising an eccentric cam (51) mounted integral in rotation with the input shaft (10), and a cycloidal disc (52) mounted integral in rotation with the cam (51), in such a way that a rotation of the cam (51) about the longitudinal axis (L) drives a rotation of the cycloidal disc (52) in an eccentric and cycloidal movement, and a transmission member (60) suitable for transmitting an angular displacement of the cycloidal disc (52) to the output shaft (20).

An eccentric oscillation gear device according to the disclosure includes: a casing; a first member supported by the casing via a first bearing; a second member supported by the casing via a second bearing; and a fastening portion fastening the first member and the second member to each other in an axial direction of the casing. The fastening portion includes an externally threaded portion and an internally threaded portion. At least one selected from the group consisting of feet of threads of the externally threaded portion and roots of threads of the internally threaded portion has elasticity portions for facilitating elastic deformation of the threads associated with the elasticity portions when the externally threaded portion and the internally threaded portion are tightened to each other.

A variety of transmissions, and improvements thereof, are provided having improved efficiency and other benefits. The transmissions include one or more inner members that are driven by one or more cams or other means to engage in precessional rotation about an axis of rotation that, itself, orbits about a primary axis of rotation. A plurality of shaped rollers are in contact with shaped cutouts on the inner member(s) and on a ground member such that an input rotation/torque applied via the cam is realized as an output rotation/torque at an output member that is coupled to the inner member(s). Tire rollers and contact surfaces are shaped such that the rollers engage in rolling motion relative to the contact surfaces, providing improved efficiency. Multiple inner members, and corresponding sets of shaped rollers, can be provided to increase power capacity, reduce torque ripple, reduce wobble, or provide other benefits.

The present invention relates to a mechanical reduction gearing (1) comprising: —an input shaft (3), —a sun gear (5) coupled in rotation to the input shaft (3), —a planet carrier (7) rotatable with respect to the input shaft (3) and supporting an output shaft (74) coaxial with the input shaft (3), said planet carrier (7) comprising at least one planet shaft (s1, s2, s3) extending parallel to the input shaft (3), —at least one cam (13) arranged around the planet shaft (s1, s2, s3) and comprising a first axial portion (p1) concentric to the planet shaft (s1, s2, s3) and at least one second eccentric axial portion (p2, p3), said at least one planet shaft (s1, s2, s3) being mounted rotatably with respect to the planet carrier (7) and/or said at least one cam (13) being mounted rotatably with respect to the associated planet shaft, —at least one planet gear (15) coupled in rotation to the cam (13) at its first concentric axial portion (p1) and configured to engage with the sun gear (5), —a peripheral annulus (17) arranged concentrically to the input shaft (3) and comprising an inner toothing, —at least one toothed wheel (r1, r2) intended to engage with the inner toothing of the peripheral annulus (17) and comprising at least one through-orifice offset with respect to the centre of the toothed wheel (r1, r2) and configured to cooperate with the second axial portion (p2, p3) of the cam (13) such that the rotation of the cam (13) causes the toothed wheel (r1, r2) to roll against the peripheral annulus (17), said rolling movement of the toothed wheel (r1, r2) being accompanied by the rotation of the planet carrier (7) with respect to the input shaft (3), and wherein the toothings of the peripheral annulus (17) and of the at least one toothed wheel (r1, r2) are toothings in the form of an involute to a circle.

In a wobble removal shaft coupling device including a wobble removal gear having an internal gear with a first central axial line and an external gear meshing with the wobble removal gear and having a second central axial line. The first and second central axial lines are in parallel with and offset from each other, and the external gear teeth are identical in number to the internal gear teeth of the wobble removal gear. At least one of the two sets of the gear teeth are resiliently deformable in a circumferential and/or radial direction so as to allow the two gears to be meshing with each other while permitting an eccentric wobbling movement of the external gear relative to the internal gear without requiring a play or a sliding engagement. The wobble removal shaft coupling device can be incorporated in a hypocycloid reduction gear device.

The invention is drive mechanism for transmitting rotating motion, comprising a drive mechanism housing (15) and a first shaft (10) rotatably connected to the drive mechanism housing (15), an eccentric shaft section (14, 18) being parallel with the first shaft (10) and being offset with respect to first shaft (10) by an eccentricity parameter value, a wobbling disc (25, 27) being rotatably connected to the eccentric shaft section (14, 18), and a wobbling gear-wheel (24, 26) connected by means of a fixed or a releasable connection to the wobbling disc (25, 27) and having an axis parallel with the first shaft (10). The drive mechanism according to invention further comprises a transmitting gear-wheel (22) having an axis of rotation arranged parallel with the axis of the wobbling gear-wheel (24, 26) at a distance therefrom determined by the eccentricity parameter value, being connected to the drive mechanism housing (15) as being rotatable around its axis of rotation, having a first toothing (28) with a teeth number different from the teeth number of the wobbling gear-wheel (24, 26), and connected to the wobbling gear-wheel (24, 26) with its first toothing (28), and a guiding connection establishing, upon motion of the first shaft (10), wobbling motion of the wobbling disc (25, 27) together with the connection between the wobbling gear-wheel (24, 26) and the transmitting gear-wheel (22), and having an axis being offset with respect to the axis of the eccentric shaft section (14, 18).

An eccentric gear unit for a braking force generator. The eccentric gear unit includes an input shaft with an eccentric, which input shaft can be rotated about an axis of rotation, wherein the eccentric is mounted in a central hole of a cam which rolls on a ring gear, and wherein the cam is coupled to an output shaft which is coaxial with the input shaft, via coupling arrangement which includes at least one pin which engages in an opening of the cam. A braking force generator having an eccentric gear unit is also provided.

A speed reducing mechanism according to one embodiment includes an output shaft, carriers each of which has an output shaft hole, and oscillating gears each of which has an output shaft insertion hole. The output shaft is inserted in the output shaft hole and the output shaft insertion hole and contacts the inner peripheral surfaces. The surface roughness Ra of the inner peripheral surfaces defining the output shaft hole and output shaft insertion hole is equal to or less than 1.6 μm. The static friction coefficient of the inner peripheral surfaces against the output shaft is equal to or less than 0.2.

A cycloid speed reducer includes an input shaft, a rolling assembly, a first cycloid disc, a second cycloid disc, a first crankshaft, a second crankshaft, a first output disc and a second output disc. The first cycloid disc and the second cycloid disc are disposed around the input shaft and rotated with the input shaft. The first cycloid disc and the second cycloid disc are located at two opposite sides of the rolling assembly, respectively. The first crankshaft includes a first concentric end and a first eccentric end. The first eccentric end is linked with the first cycloid disc. The second crankshaft includes a second concentric end and a second eccentric end. The second eccentric end is linked with the second cycloid disc. The first output disc is linked with the first concentric end. The second output disc is linked with the second concentric end.

The present application discloses a sensor provided with a detection portion that detects a foreign substance of a predetermined size or larger generated in a lubricant in a gear device and an output portion that, upon the detection portion detecting the foreign substance, outputs information indicating that the foreign substance has been detected.