Abstract: An Oldham coupling for connecting two parallel structural parts such as shafts is disclosed wherein an intermediate ring is freely movable between the hubs of the two structural parts intended for connection. The ring carries on its flat sides two lands located at 90.degree. relative to each other and the lands engage corresponding grooves in the hubs. The lands are convex at their friction surfaces and the load bearing walls of the grooves are correspondingly concave to receive the lands. An Oldham coupling of this type is particularly suitable as both a guiding and a rotation inhibiting mechanism for the revolving displacement body of a rotating piston machine of the displacer type.

Abstract: A wobble drive mechanism for a translationally moving structural part includes a wobble rod which is moved by way of a crank drive mechanism. The wobble rod includes a spherical section at one end thereof that is seated in a bearing bush of a crank. At its opposite end, the wobble rod includes a second spherical section that is seated in a stationary structural part. A third spherical section is positioned between the two ends of the wobble rod and is seated in the translationally moving structural part. The spherical sections are supported in hemispherical articulation sockets located in the manner of a mirror image in the two structural parts. A spring device can be provided to ensure full contact of the spherical sections in their respective articulation sockets.

Abstract: In a positive displacement machine for incompressible media, with a working chamber (4) located in a stationary housing (1, 2) and having the configuration of a circular slot, a circular displacer body (8) located in said working chamber, is being held on a disk shaped rotor (3) driven eccentrically relative to the housing. The displacer body contacts the inner and outer circumferential walls of the working chamber at least one sealing line continuously progressing in operation, whereby the medium is conveyed from an inlet (6) to an outlet (7). The inlet is separated from the outlet by a land (5) extending radially in the working chamber (4). For the guidance of the displacer body relative to the housing an Oldham (cross keyed) coupling (9, 10) is provided, and for the circular drive of the displacer body a wobble rod (12, 12') is connected with a driving crank drive (13). In the area of the land (5) the inner and outer work spaces (27, 28) communicate with each other at the inlet ( 6) and the outlet (7).

Abstract: A synchronous motor which has a ring-shaped stator with a radially magnetized ring-shaped permanent magnet and an external housing of a material of high permeability to complete the magnetic circuit. At the inner side of this ring-shaped stator lies a rotor having a central core provided at its ends with pole rings of a material of high permeability. The coil of the motor is provided in the center of the stator and mounted between the pole rings. This construction gives rise to a high magnetic flux in the permanent magnet in the region of the poles of the rotor, which in turn, provides a high driving torque; while the rotor is made exclusively of material of high permeability, having a low weight and a low moment of inertia. Such motors, even when constructed to operate at relatively high power, are thus assured of positive starting.

Abstract: A self-starting single-phase synchronous motor comprising a generally bell-shaped permanently magnetized rotor, a coil located inside the rotor and having a core which is connected at both ends to stator parts having distinct poles, one of the stator parts being located between the coil and rotor and the other stator part being located outside the rotor, the rotor being rotatably mounted on the shaft with defined friction, a resilient coupling element arranged between the rotor and shaft, and locking means acting on the rotor for determining the starting direction of rotation and located in front of the resilient coupling element on the power transmission path.