Abstract: A hydrostatic fan drive is operated with a closed circuit and includes a variable-displacement pump with a swept volume that is configured to be adjusted by an adjustment device. The variable-displacement pump is connected by two working lines to a motor that is coupled fixedly in terms of torque to a fan impeller. The fan drive further includes a feed pressure pump and an adjustment pressure line by which the adjustment device is supplied with adjustment pressure medium. A pressure cut-off valve is connected to the adjustment pressure line. The pressure cut-off valve is configured to limit an adjustment pressure, as a function of a high pressure in the working line acting as high-pressure line, to a value such that a certain value of high pressure is not exceeded. The pressure cut-off valve is configured to exhibit pilot control to regulate a working pressure of the variable-displacement pump.

Abstract: A hydrostatic fan drive is operated with a closed circuit and includes a variable-displacement pump with a swept volume that is configured to be adjusted by an adjustment device. The variable-displacement pump is connected by two working lines to a motor that is coupled fixedly in terms of torque to a fan impeller. The fan drive further includes a feed pressure pump and an adjustment pressure line by which the adjustment device is supplied with adjustment pressure medium. A pressure cut-off valve is connected to the adjustment pressure line. The pressure cut-off valve is configured to limit an adjustment pressure, as a function of a high pressure in the working line acting as high-pressure line, to a value such that a certain value of high pressure is not exceeded. The pressure cut-off valve is configured to exhibit pilot control to regulate a working pressure of the variable-displacement pump.

Abstract: A hydrostatic drive, in particular a fan drive, with a variable displacement pump is configured to drive at least one hydraulic motor. The variable displacement pump is activated via a pressure regulating valve and a following directional valve predetermining the feed direction, via which valves the control spaces of an actuating cylinder can be acted upon with a control pressure difference. The variable displacement pump is prestressed into a basic position in which the feed volume flow is maximum.

Abstract: An electromagnet having a pole tube, and having a coil that encompasses the pole tube and is mounted so as to be displaceable along a longitudinal axis of the pole tube, a first end face of the coil or of the housing thereof bearing on a first counter-bearing disposed at a first end portion of the pole tube, and an elastic element, which is supported on a second counter-bearing and biases the coil and/or the housing thereof against the first counter-bearing, is provided between a second end face of the coil or the housing thereof and the second counter-bearing disposed at a second end portion of the pole tube.

Abstract: An apparatus is provided for exerting on a regulating piston of a control device a regulating force that is a function of the position of an actuating lever. The apparatus comprises a bearing arrangement for supporting the actuating lever, a first arm and a second arm, each of which is rotatably mounted on the bearing arrangement independently of the others. The apparatus additionally includes a carrier element that is connected to the actuating lever, and an elastic element connecting the first arm and the second arm to one another. The apparatus is especially distinguished by the fact that the position of the carrier element relative to the first arm and to the second arm is adjustable to establish freedom from backlash.

Abstract: An electromagnet having a pole tube, and having a coil that encompasses the pole tube and is mounted so as to be displaceable along a longitudinal axis of the pole tube, a first end face of the coil or of the housing thereof bearing on a first counter-bearing disposed at a first end portion of the pole tube, and an elastic element, which is supported on a second counter-bearing and biases the coil and/or the housing thereof against the first counter-bearing, is provided between a second end face of the coil or the housing thereof and the second counter-bearing disposed at a second end portion of the pole tube.

Abstract: A hydrostatic drive, in particular a fan drive, with a variable displacement pump is configured to drive at least one hydraulic motor. The variable displacement pump is activated via a pressure regulating valve and a following directional valve predetermining the feed direction, via which valves the control spaces of an actuating cylinder can be acted upon with a control pressure difference. The variable displacement pump is prestressed into a basic position in which the feed volume flow is maximum.

Abstract: An apparatus is provided for exerting on a regulating piston of a control device a regulating force that is a function of the position of an actuating lever. The apparatus comprises a bearing arrangement for supporting the actuating lever, a first arm and a second arm, each of which is rotatably mounted on the bearing arrangement independently of the others. The apparatus additionally includes a carrier element that is connected to the actuating lever, and an elastic element connecting the first arm and the second arm to one another. The apparatus is especially distinguished by the fact that the position of the carrier element relative to the first arm and to the second arm is adjustable to establish freedom from backlash.