A drive unit for converting a rotational motion into a linear reciprocating motion includes a motor shaft extension having at least a first eccentric shaft element moving in a circle around the motor shaft's longitudinal axis and in a plane perpendicular thereto and at least one elastically deformable unit having a coupling element for coupling with a driven element. The first eccentric shaft element is coupled with the deformable unit to periodically deform the deformable unit so that a longitudinal position of the motor shaft of the coupling element of the deformable unit periodically changes. The deformable unit has a first arm section and a second arm section, each having a first end and a second end. The second end of the first arm section is connected to the first end of the second arm section, wherein the first end of the first arm section is connected to a mounting structure fixed relative to the motor. The second end of the second arm section is arranged with a distance to the first end of the first arm section in the direction of the longitudinal axis of the motor shaft.

[Problem] To provide a swing-type speed reducer that has a large crossing angle, and that can be further miniaturized compared to conventional speed reducers.

[Solution] Provided is a swing-type speed reducer 1 comprising: a main body 10; an input shaft 20 that is rotatably held in the main body 10; a precession body 30 that precesses; a swinging body 40 that engages with the precession body 30 and is swung by the precession; and an output shaft 50 that is rotated by the swing of the swinging body 40. In the present invention, a precession annular groove 34 for precession of the precession body 30 and a swinging annular groove 33 for swinging the swinging body 40 are provided on the surface of a spherical portion 31. Thereby, in comparison to a conventional case where the grooves are provided on the inner peripheral surface of a member, the region where the grooves can be machined is increased, and the device can be further miniaturized.

A power transmitting system including: a first piston disposed within a center bore formed through the rotary shaft such that the first piston is axially reciprocable; a sleeve connected to the first piston and having internal teeth meshing with the external teeth of the rotary shaft so that the sleeve is rotated with the rotary shaft, and such that the sleeve is axially reciprocable together with the first piston according to axial movements of the first piston; a synchronizer ring supported in sliding contact with an outer circumferential tapered surface of the clutch gear such that the synchronizer ring is rotatable relative to the clutch gear; and an actuator including a second piston to axially advance the first piston for thereby bringing the sleeve's internal teeth into meshing engagement with the clutch gear through the synchronizer ring. The first piston and second piston are disposed coaxially with the rotary shaft.

The present disclosure is concerned with a motion converter structured for converting a rotational motion provided by a motor shaft into a linear reciprocating motion of a drive shaft. The motion converter has a deformable unit, a mounting unit connected with the deformable unit, a coupling unit connected with the deformable unit, the coupling unit being structured to receive the drive shaft or the coupling unit comprising the drive shaft, a connector unit connected with the deformable unit, the connector unit comprising at least a first essentially U-shaped receiver being structured for receiving a first eccentric shaft element of the motor shaft and having a U-base and two U-legs together defining a first elongated hole having a length, a width and a height, and a first bracing element that connects the two U-legs of the first essentially U-shaped receiver on their free ends such that access into the first elongated hole across the width and the height of the first elongated hole is provided, preferably where the first bracing element is bar-shaped or U-shaped or O-shaped, and where the length is measured from an inner surface of the U-base to the free ends of the U-legs.