Abstract:
A hydraulic system is described, having a supply unit comprising a pressure source and a pressure sink, and also several hydraulic loads. It is desirable to keep expenditure to a minimum in such a system. For that purpose, the loads (7) are hydraulically connected by way of a common line branch (5) to the supply unit and are connected by way of an electrical bus (6) to a central processing unit.
Abstract:
A hydraulic piston machine is disclosed, with a cylinder body (1) and a control counter-plate (4) which engage one another via the intermediary of a control surface, the cylinder body having at least one cylinder which emerges by way of an opening (2) into the control surface, and the control counter-plate (4) has a high-pressure channel (6) and a low-pressure channel (5) which are connected to a high-pressure connection and a low-pressure connection (7) respectively and, upon movement of cylinder body (1) and control counter-plate (4) relative to one another, are passed over by the opening (2), the low-pressure channel (5) having a groove (9) at its end passed over first by the opening (2). It is desirable to be able to operate a machine of that kind also with a hydraulic fluid that has a relatively low viscosity. For that purpose, the groove (9), together with the opening (2), produces a directed jet (12) at least immediately after the start of their overlap.
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:
A method is proposed for mounting a bushing (2) in a base member (1) of a hydraulic machine, in which the bushing (2) is inserted in a cylinder bore (3) provided with a groove (4) on its inner wall, and a hydraulic machine is proposed. In this connection, materials which are not deformable or only deformable with difficulty should be used for the bushing (2). For that purpose, a groove (5) is made on the outer wall of the bushing (2), the bushing is inserted into the base member (1) sufficiently far so that the inner-wall groove (4) and the outer-wall groove (5) coincide at least partially, and a locking element (7) is introduced at least with interlocking engagement into a groove space (6) formed by the inner-wall groove (4) and the outer-wall groove (5).
Abstract:
A controlled proportional valve is provided, with a main slide valve section (4) containing a main slide valve, which section controls a flow of fluid between a pump connection (P) connected to a pump (2) and a tank connection (T) connected to a tank (6) and two work connections connected to a load (5) and which generates a load-sensing signal (LSINT) in dependence on the pressures at the work connections (A, B), and with a compensating slide valve section (3) which controls the pressure across the main slide valve section (4) in dependence on the load-sensing signal (LSINT). It is desirable to achieve a more rapid response time in a proportional valve of that kind, wherein the control means should be capable of being retroffited in existing proportional valves. To that end, a control arrangement (10) which controls the pressure of the load-sensing signal (LSINT) to influence the actual volume flow and/or the actual pressure in the work connections (A, B) is provided.
Abstract:
A steering system for vehicles or ships is provided, with a steering handwheel (11) and a steering element (1) with no mechanical linkage line therebetween, with a steering handwheel sensor device (14, 15), a steering element sensor device (16, 17) and a control arrangement (61, 62) which, in dependence on the output signals of the sensor devices (14-19), operates an electromechanical transducer (2, 3, 4, 5), on the output side of which the steering element (1) is arranged. It is desirable to increase the reliability of such a steering system. For that purpose, the control arrangement comprises at least two independent control units (61, 62), and a fault-monitoring device (28, 38) is provided which precludes a defective control unit from influencing the steering element.
Abstract:
A method and a circuit arrangement (1) for charging and discharging a load (4) with a capacitive component is proposed, having an energy source (3) which provides a direct voltage between a positive (+) and a negative (-) or earth terminal, a charging circuit and a discharging circuit, each of which has a coil (6, 9), and switching means (7, 8, 12, 13) controlled by a controlling system (2). The charging and discharging of the load (4) is intended to be controlled in an improved manner with a method and a circuit arrangement of that kind. For that purpose the controlling system (2) compares a report-back signal (C, H, K, L) from the circuit arrangement, or a signal derived therefrom, with an external desired value signal (Vin), and actuates the switching means (7, 13, 8, 12) as a function of a difference in the two signals. The charge is supplied to or down from the load in the form of quanta, the magnitude of the quanta being variable.
Abstract:
A fault-tolerant reluctance motor has a multiphase stator winding. The stator (2) has a different number of poles from the rotor (5). The lead angle and the pole angle ((beta)s, (beta)r) embraced by each stator and rotor pole (3, 5) is at least the same as twice the step angle (a): (epsilon)=360 /(q.Nr), where (q) is the number of phases and (Nr), 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 (6, 7) is completely or partially ineffective owing to a fault.
Abstract:
A setting device (1) for a radiator valve with two parts rotatable with respect to one another about an axis (4), namely, a rotary knob (2) and a base part (3), and a means limiting the angle of rotation is provided, which means comprises at least one stop member (16), which is fixed in the first of the parts in the direction of rotation, and at least one limiter (10), which is arranged to be fixed in the second of the parts in recesses in different positions in the direction of rotation. It is desired to increase the ease of operation in a device of that kind. To that end, the first part (3) closes the recess receiving the limiter (10) at least sufficiently far to block a movement of the limiter out of the second part (2).
Abstract:
A micromechanical filter is provided with a top layer (10) provided with openings (13), a bottom layer (12), and an intermediate layer (11) provided in predetermined first regions (A) between the top layer (10) and the bottom layer (12), which intermediate layer substantially determines the spacing between the top layer and the bottom layer in predetermined intermediate layer-free second regions (B). It is desirable for a filter of that kind to be operable with as small a pressure difference as possible. For that purpose, third regions (C) are provided in which the spacing between the top layer and the bottom layer is larger than in the first and second regions.