Abstract: A shaft-coupling having two halves, each formed with at least two flat, sloping surfaces running at right angles to a load-transfer direction, each pair of sloping surfaces, facing each other on the two halves of the coupling, defining a space therebetween. Arranged in these spaces are sliding wedges each comprising two flat, sliding, surfaces facing away from each other and supported upon a pressure-element. In order to ensure that a shaft-coupling of this kind be suitable for large torsion-angles, absorb high torques and, in addition, has a small structural volume, a spring-element, adapted for the radial spring-action, is provided between at least one sliding wedge and the pressure-element.

Abstract: A fluid-flow machine, particularly of the hydraulic propeller-pump type, comprises a central hub, a bearing support fixed to the hub for rotation therewith, a plurality of blades distributed symmetrically around the hub, each blade having a pivotable blade-root for adjusting the angle of attack of the blades. The blade-roots are mounted on the bearing support for rotation around the longitudinal axis of the hub. An adjusting device pivots the blades about the longitudinal axis of the blade-roots, the latter including, for each blade, a self-locking reduction gear and a drive shaft. The bearing support is formed with open-ended housings, each corresponding to one of the blade-roots. The drive shafts, the reduction-gears and the blade-roots are mounted, at least partially, within the housings aforesaid.

Abstract: The invention relates to a planetary gear having two adjacent identical central wheels of different pitch and a planet wheel whose pitch is equal to that of a virtual tooth row formed by the central wheel teeth. The teeth of the planet wheel extend into the tooth gaps between the virtual tooth rows. The planet wheel is guided and driven by a rotary disk. At least two of the three wheels have pivotable teeth. The teeth of both the central wheels and the planet wheel are of substantially triangular cross section with plane tooth profiles. It is a main objective of the invention to provide a planetary gear permitting the flank angles of the virtual tooth gaps to be adapted to the profile angle of the planet wheel teeth, in particular, in order to transmit large torques and/or also in order to achieve low speed ratios. According to the invention, the pivotable teeth of at least one central wheel are arranged on journals.