Abstract: A slanting plate arrangement in a hydraulic axial piston machine is disclosed, having a slanting plate and a pressure plate, between which at least one slider shoe of a piston axially movable in a cylinder body is held, the pressure plate being rotatably connected to the slanting plate by means of an axle element limiting axial movement of the pressure plate with respect to the slanting plate in at least one direction. It is desirable to be able to use such a slanting plate arrangement even when a hydraulic fluid that has no or only slight lubricating properties is used. For that purpose, in the region of contact between the axle element and the pressure plate and/or axle element and slanting plate, a material combination of a metal and a high-strength thermoplastic plastics material is provided.

Abstract: A valve with presetting facility has a valve housing with a rotatable sleeve. To form a present throttle, a control opening at the base of the sleeve co-operates with a control opening at a base face of the valve housing. The control opening in the base face is formed by an eccentric bore. The control opening in the end face of the base is formed by a channel which extends over a circular arc of less than 360.degree. , is connected at one end by way of an eccentric bore to the inner space of the sleeve and has a cross section that reduces towards the other end. That allows presetting to be very precise and manufacture to be inexpensive.

Abstract: A deforming tool having a die and prestress ring for the extrusion of a workpiece. The prestress ring being constructed so that the radial prestress exerted by it on the die in a region of transition from one to the other of two converging inner faces of the die, which together form an internal angle of less than 180 degrees, and/or in the region of a sudden transition from a low to a high value of the pressure exerted by the workpiece during its deformation radially on the die, is less than in the regions adjacent to the transition.

Abstract: A hydraulic piston machine is disclosed, having a cylinder drum and a control plate, which control plate has at least one high-pressure "kidney" and at least one low-pressure "kidney" and also a contact surface against which the cylinder drum bears in operation, at least the contact surface being provided with a friction-reducing layer. It is desirable for such a machine to have better operational behavior and a longer service life. For that purpose, the contact surface in the region of the low-pressure kidney has a recessed region forming a gap between the cylinder drum and the control plate.

Abstract: A hydraulic axial piston machine is disclosed, with a cylinder drum (2), which has at least one cylinder (3), in which a piston (6) is mounted so as to be axially displaceable, and with a control counter-plate (11 ) which, on rotation of the cylinder drum (2) and the control counter-plate (11 ) relative to one another, connects the cylinder (3) in dependence upon its position with a fluid inlet (14) and a fluid outlet (15). With a machine of that kind, it is desirable to improve balancing out of the forces necessary for effecting a seal between the cylinder drum (3) and the control counter-plate (11). For that purpose, between the cylinder drum (2) and the control counter-plate (11 ) there is arranged a pressure plate (17) which engages the cylinder drum (2) via the intermediary of a spring element (21), the pressure plate (17) having a through-opening (20) associated with the cylinder (3), which through-opening is connected to the cylinder (3) in a fluid-tight manner.

Abstract: An axial piston machine (1) is described, having a cylinder body (2) that is rotatable relative to a wobble plate (3) and in which several pistons (6) are arranged so as to be axially displaceable, the pistons being supported on a sliding-contact face (4) of the wobble plate 930 by means of slider shoes (9) articulated at the free ends of the pistons, wherein a pressure element (13) holding the slider shoes (9) on the sliding-contact face (4) is provided. It is desirable to reduce internal leakage in an axial piston machine of that kind. For that purpose, a wave spring element (16) is provided between each slider shoe (9) and the pressure element (13).

Abstract: A fault-tolerant reluctance motor has a multi-phase stator winding. The stator has a different number of poles from the rotor. The lead angle and the pole angle (.beta..sub.s, .beta..sub.r) embraced by each stator and rotor pole is at least the same as twice the step angle ##EQU1## where q is the number of phases and N.sub.r is the number of rotor poles. In particular, the stator has ten poles, the rotor has six poles and the stator winding has five phases. Such a reluctance motor starts up from any motor position in one or other direction of rotation, even when one of the phase windings is completely or partially ineffective owing to a fault.

Abstract: The invention relates to a rotor for an electric machine, particularly to a rotor for a hermetic refrigerating compressor. The rotor core contains a number of axial slots, containing the electric conductors of the rotor, which are short-circuited by short-circuiting rings. The rotor has a spindle hole with at least one increased internal diameter for accommodating the bearing neck of the motor. The increased internal diameter of the core results in increased magnetic field strength in the area with increased internal diameter. The invention reduces the magnetic field strength in the area with increased internal diameter by the axial slots having varying profiles in their longitudinal direction.

Abstract: In a hydraulic system with a pump (1) and a load (4, 104), a pressure relief valve (16) is connected to the pump pressure side (3) and open when a difference between pump pressure and maximum load pressure exceeds a predetermined pressure. Pump pressure is controlled by a pump controller (22), such that the pressure difference set by the pressure relief valve is greater than a pressure difference set by the pump controller. A controller (20) presets the pump delivery rate, depending on changes in input signals (s1, s2) and regulates the pump delivery rate in dependence on a pressure difference signal (U). The pressure relief valve includes a position sensor, which generates the pressure difference signal.

Abstract: A unity power factor power supply for an electric motor. A switch-mode circuit is employed which, in a first mode, transfers power from AC main to a constant voltage DC bus. In a second mode, power generated on the DC bus is fed back to the main power supply. The circuit of the invention automatically maintains the DC bus voltage constant and sets an adequate operation mode by processing the DC bus voltage signal. In both operation modes, the unity power factor and sinusoidal waveform of the AC main side are maintained.

Abstract: A hydraulic pumping device for use in a hydraulic machine having a piston and slider shoe unit made of a combination of plastic and metal material to operate with virtually lubricant free fluid.

Abstract: A hydraulic system has a pump (1) with at least one load (4, 5) and accompanying bi-directional valves (8, 8a). A first comparator (A) establishes which motor line (6, 7) is carrying the higher load pressure. A second comparator (B) establishes whether the input-side motor line (6, 7) allocated a directional signal identifying the direction of the valve displacement is carrying the higher pressure or whether a load (4, 5) is being operated with negative loading. Depending on the result of the comparison, the load pressure signal (y1, y2) can be processed differently.

Abstract: A miniature actuating device with a carrier, a diaphragm, a hollow space formed between the carrier and the diaphragm and an insulating layer arranged between them and with two electrode terminals for producing an electrostatic field between the diaphragm and the carrier for an activated state. With an actuating device of this kind, it is desired that the throw can be achieved under the influence of the electrostatic field be rendered as large as possible. To that end, the hollow space is present only in the state of rest and in the activated state virtually disappears maintaining the diaphragm buckle free.