Abstract: A swash-plate machine includes a hollow-spherical work chamber which is divided by a partition into at least one high-pressure chamber and one low-pressure chamber, into which an operating medium can be carried through a conduit system. The partition extends up to a piston carrier and cooperates with a plate-like sealing strip. A circular piston is adapted to the diameter of the work chamber and communicates with the exterior through a supported drive shaft which effects a tumbling motion of the piston. The piston has at least one radial slit extending from the circumference to approximately the piston carrier. A guide journal which is inserted in the slit cooperates with the partition. The piston tapers outward toward the circumference. End surfaces of the piston are in contact with opposed lateral surfaces that extend at right angles to the axis of rotation of the drive shaft and laterally define the work chamber.

Abstract: A swash-plate machine includes a hollow-spherical work chamber which is divided by a partition into at least one high-pressure chamber and one low-pressure chamber, into which an operating medium can be carried through a conduit system. The partition extends up to a piston carrier and cooperates with a plate-like sealing strip. A circular piston is adapted to the diameter of the work chamber and communicates with the exterior through a supported drive shaft which effects a tumbling motion of the piston. The piston has at least one radial slit extending from the circumference to approximately the piston carrier. A guide journal which is inserted in the slit cooperates with the partition. End surfaces of the piston are in contact with opposed lateral surfaces that extend at right angles to the axis of rotation of the drive shaft and laterally define the work chamber. The guide journal disposed in the radial slit is guided in a guide groove disposed in the partition.

Abstract: A nutating pump of the type which has a rotatable shaft with a central member with an annular support groove at an angle to the shaft in which a disk is moveably supported and is restrained against rotation by a partition inserted in a radial slot in the disk, and has conial sections coaxial with the shaft and positioned on either side of the central member, the peripheral surface of the conic sections and the annular groove being at substantially the same angle with respect to the shaft. One such pump includes moveably replaceable central members and conic sections whereby the operating characteristics of the pump may be changed without having to replace the pump body. In another embodiment, a cylindrical insert is included in the radial slot in the disc, and grooves are included in the peripheral surfaces of the conic sections to receive the cylindrical insert as it passes over the surfaces of the conic section.