Abstract:
The invention relates to a regulation method for the hydraulic support of an electric drive. The force of an electric motor whose rotational movement is translated into a longitudinal movement via a transmission and the force of a piston of a hydraulic cylinder act upon an axially displaceable machine part in the longitudinal direction. The force exercised by the hydraulic motor is limited to a value at which the transmission is not yet damaged. In order to limit the force component supplied by the electric motor, a regulation difference is established from the desired value for the force acting upon the machine part in the axial direction and the actual value of said force. Said difference controls the sum of the force components acting upon the machine part in the axial direction. A desired value for the force acting upon the piston in the axial direction is established from the actual value of the force acting upon the machine part in the axial direction and a value that takes the mechanical stability of the transmission into account. A regulation difference is established from the desired value for the force acting upon the piston in the axial direction and its actual value. Said difference controls one of the force components acting upon the machine part in the axial direction.
Abstract:
Die Spule einer Magnetspulenanordnung weist einen Spulenkörper auf, der mit einer Wicklung (14) versehen und mit Kunststoff (17) umspritzt. An die Spule ist ein mit Kontaktfahnen versehener Stecksockel angeformt, von denen eine für den Anschluß des Schutzleiters (18) vorgesehen ist. Über die spule ist ein Metallgehäuse (12) geschoben. Die Verbindung des Metallgehäuse mit der dem Schutzleiteranschluß zugeordneten Kontaktfahne erfolgt über ein Verbindungselement, das durch eine Aussparung des Stecksockels geführt ist. Zwischen dem Verbindungselement und der Aussparung ist ein Dichtelement (42) angeordnet, das ein Eindringen von Flüssigkeit aus dem Bereich zwischen dem Metallgehäuse und der Spule in den Bereich verhindert, in dem ein Stecker an die Kontaktfahnen angeschlossen ist. Um die elektrische Verbindung zwischen der dem Schutzleiteranschluß zugeordneten Kontaktfahne und dem Metallgehäuse bei einem in das Metallgehäuse geschraubten Verbindungselement (31) zu verbessern, ist zwischen der Kontaktfahne und dem Metallgehäuse ein rohrförmiges Metallteil (36) angeordnet. Zwischen dem Verbindungselement und dem rohrförmigen Metallteil sowie zwischen diesem und der Aussparung in dem Stecksockel ist jeweils ein Dichtelement (41, 42) angeordnet. Derartig Magnetspulenanordnungen werden für elektromagnetisch gesteuerte hydraulische Ventile verwendet, bei denen von außen zugängliche Metallteile mit einem Schutzleiteranschluß zu verbinden sind.
Abstract:
The invention relates to a working cylinder actuated by hydraulic fluid, comprising a piston (20) to which a piston rod (35) is fixed and which can be axially displaced in a cylinder chamber between two end positions such that it inversely modifies the volume of two cylinder chambers (21, 22) on either side. A damping element (40) is arranged at least at one side of the piston (5) which when the piston moves into one of the terminal positions enters an opening between the one cylinder chamber and a cylinder connection, such that together with said opening it forms a circular throttling gap for the throttled outflow of hydraulic fluid from the cylinder chamber to the cylinder connection. To obtain a high damping capacity and in this way to be able to slow down large masses moved by the cylinder along a defined path, the outer surface of the damping element (40) in the axial direction is shaped such that when the damping element is fully immersed, it has a maximum diameter at the chamber-side start of the opening and, following a flat section having a small diameter (52) or small diameters, if the damping element is deeply immersed, across a short section has a medium diameter situated between the maximum and the small diameter.
Abstract:
The invention relates to a hydraulic control arrangement for the demand-feed regulated hydraulic fluid supply of preferably several hydraulic consumers which are provided with proportionally adjustable directional control valves (12). A required amount of hydraulic fluid can be delivered by two hydraulic pumps (30, 31) via a common supply line leading to the directional control valves. A first demand-feed regulator (45) is associated with the first hydraulic pump (30) and a second demand-feed regulator (46) is associated with the second hydraulic pump (31). A return valve (36) which opens into the feed line is mounted between the first hydraulic pump (30) and the feed line (26). According to the invention, a return valve (37) that opens into the feed line (26) is also arranged between the second hydraulic pump (31) and the feed line (26). Means (90, 91, 95, 96) for regulating the power use of the demand-feed regulator (45, 46) are provided, whereby said means can be modified in such a way that the hydraulic consumers can be exclusively supplied with hydraulic fluid by the first hydraulic pump (30) or the second hydraulic pump (31).