Robert Boschgmbh

Bosch Rexroth Ag

Roland Schempp

Juergen Gruen

Joachim Heiser

Klemens Strauss

Hermann Sanzenbacher

Horst Bartel

Volkmar Leutner

Berthold Pfuhl

Wolfgang Bernhardt

Werner Schumacher

Heinrich Kochendorfer

Heinz Flaschar

Heinz Kleinschmidt

Klaus Sopha

Heinz Gand

Dietmar Meier

Hubert Mohaupt

Uwe Baerenwaldt

Heinrich Lodige

Lars Olems

Rainer Hoheisel

Christoph Giegerich

Konrad Braunlinger

Hans J Haase

Raimund Skambraks

Christian Walter

Jürgen GRÜN

Jürgen Grün

A solenoid arrangement comprises a pole tube which is axially subdivided into a pole core section, a transition section, and a tube section. A magnetic flux between the pole core section and the tube section is interrupted by the transition section. An armature is movably guided in the pole tube and has, at its end facing the pole core section, a flange which axially projects from an end face. According to the invention, the pole core section has a stepped depression into which the armature can plunge and which, starting from the transition section, is subdivided into an annular collar, a shoulder, and a notch which is set back axially and radially. An axial dimension of the collar exceeds an axial dimension of the flange.

Solenoid arrangement and valve arrangement

The invention relates to a solenoid wherein a magnetic discontinuity is formed in the pole tube reducing the effective material thickness, such as by reducing the thickness, particularly the wall thickness of the magnetically active material, the front face of the armature facing the pole core and a bottom face in the interior of the pole tube at the pole core each have a contour allowing mutual axial overlapping. This enables advantageous influencing of the force-stroke characteristic curve of the solenoid with low production effort.

A pole tube of a solenoid actuator including a non-magnetic intermediate piece having a first intermediate end face and a second intermediate end face, a pole piece having a pole end face configured to join the first intermediate end face at a first joining region, and a tube piece having a tube end face configured to join the second intermediate end face at a second joining region. At least two of the intermediate piece, the pole piece and the tube piece are configured to be connectable to each other using electric fusion. At least two of the intermediate piece, the pole piece and the tube piece have a different conductivity. A respective part of the pole and tube pieces disposed in corresponding first and second joining regions are configured to each have an electrical resistance substantially equal to an electrical resistance of a part of the intermediate piece.

Pole tube

The invention discloses methods for the production of pressure pipes of a tractive solenoid for a hydraulic valve and pressure pipes that are manufactured using these methods, wherein the pressure pipes are thermally joined.

Methods for the production of a pressure pipe of an electric hoisting magnet and pressure pipe of a hoisting magnet

What is disclosed is a lifting magnet assembly for a servo valve or control valve comprising a proportional magnet which acts on a valve spool of the control valve or servo valve through a tappet. Between the spool and the proportional magnet a failsafe magnet is provided which is penetrated or encompassed by the tappet of the proportional magnet.

Solenoid assembly

A solenoid operated directional control valve includes a visual position indicator assembled of rectifying bridge circuit whose DC output terminals are bridged by a series connection of a light emitting diode with a PTC resistor. In this manner, the indicator is universally applicable both for DC and AC power sources and for a wide range of supply voltages.

Directional control valve having an optical position indicator

A control arrangement for a hydraulic motor has an adjustable pressure medium supply device with a container, an unblockable check valve with a control connection, a plurality of chambers including a supply chamber, a motor chamber, first and second return chambers, and a control chamber, a control slider displaceable relative to the chambers, wherein a control conduit extends from the supply device and leads to the control chamber, a first pressure control member is arranged on the control slider so that in a lowered position of the latter the first pressure controlling member is located between the control chamber and the second return chamber and the control slider in its raised position blocks the control chamber, and a second pressure controlling member located between the control chamber and the motor chamber and opening into the latter.

Control arrangement for hydraulic motor

A magnetic linear drive includes an elongated cylindrical armature which is supported for axial displacement in a guiding pipe made of a pressure-resistant material. Two axially spaced solenoid windings are mounted on the guiding pipe and are interconnected by a permanent magnet. The solenoid windings are provided with lateral magnetically conducting cores the ends of which communicate with annular grooves formed in the guiding tube. The grooves are filled with a magnetically conductive material forming the poles of the electromagnet. In the region of the poles, the armature is formed with control flanges of different depths which are acted upon by the magnetic flux to impart the axial movement to the armature. One end of the armature is formed with a measuring flange which cooperates with measuring coils mounted on the guiding pipe.

Magnetic linear drive

Each consumer is provided with a load-compensated direction-reversing valve. Each valve performs a throttling function and a pressure-compensation function in order to establish a selected volumetric flow rate, and also a direction-control function. Each valve comprises a first control valve stage and a second control valve stage. One stage performs the throttling function, the other the pressure-compensation function. One of the two control valve stages also performs the direction-control function. The pressure drop across the stage which performs the throttling function at least in part controls the setting of the stage which performs the pressure-compensation function. Each valve is provided with an electromechanical transducer generating electrical signals indicative of the settings of the stage which performs the pressure-compensation function. These signals are evaluated by an electrical information-processing unit, and the results of the evaluations are used to automatically adjust the setting of a line pressure regulating valve.

Hydraulic control system for at least two consumers

A hydraulic control system has a three-position valve which in its central position disconnects the high-pressure and low-pressure sides of a pressure source from outlet lines but connects these sides of the source together through a low-pressure valve. Moved to either of its end positions the valve is disconnected from between the sides of the pressure source and the output lines are connected to the high-pressure and low-pressure source sides. A pressure-limiting valve is connected between the sides of the source. In addition, the high-pressure side is connected via pressure-reducing valve and a restriction to a pair of pilot valves which are in turn connected to the low-pressure side. These pilot valves are also connected to opposite chambers of a pilot cylinder that controls the valve body. The pressure-reducing valve between the pilot valves and the high-pressure side maintains a medium-pressure level in the system when the valves move from its central position.

Growing community of inventors

Vaihingen, Germany

Roland Schempp