Magnetic adjusting device

Abstract

In a magnetic actuating device (1), a housing (2) and a piston rod (5) which can be moved along a longitudinal axis of the housing (2) between two end positions are provided, said piston rod having at least one piston (10) which extends radially from the piston rod (5) and is made of a ferromagnetic material or at least partially comprises a ferromagnetic material. Furthermore, at least one magnet system (12) is provided which is fixed to the housing, the piston (10) and the magnet system (12) forming at least one fluid gap system (14) having an axially variable fluid gap (15) into which at least one fluid feed (16) for introducing an operating fluid is introduced, the piston rod (5) can be moved to its end position at least by introducing an operating fluid between the piston (10) and the magnet system (12).

Description

Technical Field

[0001] The invention relates to a magnetic adjusting device having a piston rod located in a housing and a piston arranged thereon, which can be moved into its end position by means of an operating fluid and the assistance of a magnet system and is fixedly held there. Background Art

[0002] DE 197 12 293 A1 discloses an electromagnetically operated adjusting device having two magnet systems spaced apart from each other, each of which has an excitation coil, between which an armature disk fixedly connected to the adjusting shaft is arranged. The armature disk is located between two oppositely acting springs and can be moved to two switching positions by the magnet system. A permanent magnet polarized in the direction of movement of the armature is assigned to one of the magnet systems, which stabilizes the armature in one switching position in the de-energized state. If the armature is to be held in the other switching position, continuous energization is required.

[0003] Furthermore, an electromagnetic linear motor is known from EP 0 568 028 A1, which consists of an armature, two inner pole shoes, two outer pole shoes, two permanent magnets and a coil, wherein the armature, together with the inner pole shoes and the outer pole shoes, forms an air gap system consisting of four magnetic air gaps, which can be changed in the axial direction and have the same size at the center position. When the coil is not energized, the permanent magnets stabilize the armature in the center position. The pole shoes are constructed to be half-shell-shaped and form a magnet system with two fixed poles together with the half-shell-shaped permanent magnets.

[0004] DE 102 07 828 B4 discloses an electromagnetic solenoid for achieving a high holding force in a stable end position. The electromagnetic solenoid consists of a stator with two magnet systems spaced apart from each other in the axial direction, each of which has an excitation winding for generating an electromagnetic flux. An armature is guided between the two magnet systems, which carries a permanent magnet device polarized perpendicularly to its direction of movement for continuously holding the armature when the excitation winding is not energized. Here, the permanent magnet device is located between the two excitation windings, whereby its effectiveness is adversely affected by leakage flux. In addition, the material of the permanent magnet device is usually brittle and can be damaged by the impact movement of the armature.

[0005] DE 10 2013 102 400 A1 describes an electromagnetic regulating device, which has a housing and an armature that can move between two end positions in the housing, the armature having an armature shaft and two armature discs arranged at a certain distance from each other. Two annular arrangements of permanent magnets polarized in the same direction radially about the axis are arranged between the armature discs in a manner fixed to the housing, and together with the armature discs form two magnet systems and an air gap system, which has an axially variable air gap. An annular coil that can be connected to a power supply is arranged between the two permanent magnets. These magnet systems and the air gap system are designed so that the armature can be fixedly held at each of the two end positions without exciting the coils, and can be moved from the corresponding end position to the relative end position by exciting the coils.

[0006] DE 10 2016 105 000 A1 discloses a bistable sensor and actuator device, which comprises an armature unit arranged in a housing and which consists of a disk-shaped permanent magnet body and a push rod unit located thereon. The armature unit can be moved axially into its stable end position by a pneumatic drive in the housing.

[0007] Known adjusting devices are often used to actuate tool clamping devices in hydraulically or pneumatically driven motor spindles. Summary of the invention

[0008] The technical problem to be solved by the present invention is to provide an adjusting device which has a sufficient holding force in order to stably hold the adjusting device in its end position and which can be quickly opened and closed.

[0009] This object is achieved by the features of claim 1. Preferred embodiments are described in the dependent claims.

[0010] According to the present invention, the above technical problem is solved by the following magnetic adjusting device, which comprises: a housing; a piston rod capable of moving between two end positions along the longitudinal axis of the housing, the piston rod having at least one piston, the piston radially extending from the piston rod and being made of ferromagnetic material or at least partially including ferromagnetic material; at least one magnet system fixed to the housing, wherein the piston and the magnet system or in particular the housing form at least one fluid gap system having an axially variable fluid gap, and at least one fluid feeding device for introducing an operating fluid correspondingly leads to the fluid gap, so that the piston rod can move to its end position at least by introducing an operating fluid between the piston and the magnet system or in particular the housing.

[0011] Advantageously, the piston rod has two pistons which are arranged at a distance from each other and which extend radially from the piston rod and are made of ferromagnetic material or at least partially comprise ferromagnetic material. In this design, the magnet system which is fixed to the housing is particularly arranged between the pistons.

[0012] However, it can also be provided that the adjusting device comprises two magnet systems, which are present in a manner fixed to the housing, between which only one piston can move, and which respectively mark the end position of the piston. The one or more magnet systems can form a part of the housing, or can be present in a form integrated in a housing part. In addition, a magnet support can be provided to support the magnet system. The one or more magnet systems, alone or in combination with other housing parts or magnet supports, form at least one surface of a fluid gap system, in particular, which is opposite to at least one surface of the piston, which also forms at least one surface of the fluid gap system. In the sense of the present invention, the end position of the piston rod corresponds to the end position of the one or more pistons.

[0013] In particular, the present invention relates to a magnetic adjusting device, which comprises: a housing; a piston rod capable of moving between two end positions along the longitudinal axis of the housing, the piston rod having two pistons arranged at a certain distance from each other, the two pistons extending radially from the piston rod and being made of ferromagnetic material; at least one magnet system fixed to the housing and present between the pistons, wherein the piston and the magnet system form a fluid gap system having an axially variable fluid gap, and at least one fluid feeding device for introducing an operating fluid correspondingly leads to the fluid gap, so that at least by introducing an operating fluid between the piston and the magnet system, the piston rod can move to its end position and can be fixedly held there by the magnet system.

[0014] In a preferred embodiment, the invention relates to a magneto-pneumatic adjusting device, which has a housing, a piston rod that can be moved along the longitudinal axis of the housing between two end positions, the piston rod having two pistons that are arranged at a distance from each other, the two pistons extending radially from the piston rod and made of ferromagnetic material, and at least one magnet system that is fixed to the housing and is present between the pistons, wherein the piston and the magnet system form a fluid gap system, in particular an air gap system, which has an axially variable fluid gap, in particular an air gap, and at least one fluid feed device, in particular an air feed device, for introducing an operating fluid, in particular an operating air, correspondingly opens into the fluid gap, in particular the air gap, so that at least by introducing an operating fluid, in particular an operating air, between the piston and the magnet system, the piston rod can be moved into its end position and can be fixedly held there by the magnet system. The use of compressed air as the operating fluid has the advantage that already existing resources can be used, so that already existing compressed air connections can be used.

[0015] The regulating device according to the present invention combines the magnetic force with the force applied to the piston by the operating fluid, thereby achieving an increase in the piston force, and the piston is stably maintained in its end position by the magnet system. In order to move the piston, the fluid is preferably introduced into one of the fluid gaps at high pressure, so that the piston moves from its end position to the relative end position. Because the piston is moved in the direction of the magnet system, a magnetic attraction force will also act on the piston from a certain distance from the magnet system, so that the movement of the piston generated by the fluid is supported by the magnetic attraction force. Then, the piston is stably maintained in its end position by the magnet system. Since the piston rod can move in two opposite directions by the force that can be applied to the two pistons, the regulating device acts in two directions.

[0016] Compared with the prior art, the invention has the advantage that the piston can be stably fixed in two end positions. By preferably introducing the fluid into the two fluid gaps, a rapid movement of the piston can be achieved. The adjustment device can use existing resources, which is conducive to reducing costs and reducing the size of the structure. In addition, the magnet system with the magnetic component is firmly embedded in the housing, thereby protecting the magnet system from dynamic stresses.

[0017] In one design, it is provided that the magnet system has a permanent magnet or a plurality of permanent magnets polarized radially in the same direction in an annular arrangement. Magnets made of sensitive magnetic materials, such as composite materials, which enable high polarization values ​​and magnetic field strengths to be achieved can be used. The permanent magnets can advantageously consist of single magnets arranged in an annular arrangement, or can also be formed in the form of an annular magnet. In a preferred design of the present invention, the magnet system is constructed to be rotationally symmetrical. However, designs different therefrom can also be adopted. Shapes such as annular, square, etc. can also be adopted. The magnet system can also be constructed as an intermittent ring, i.e., it can be constructed to be not rotationally symmetrical.

[0018] In one design, the magnet system can have radially inner and / or radially outer pole bodies made of a material that conducts magnetic flux. The pole bodies can surround the permanent magnets, thereby protecting the permanent magnets from dynamic stresses. In one design, the inner and outer pole bodies can be made of a soft magnetic material and have the shape of a closed ring.

[0019] In one embodiment, the magnet system comprises a coil, in particular a ring-shaped coil, associated with the magnet system, which can be connected to a power supply. By designing the coil accordingly, a magnetic repulsion or magnetic attraction of the piston can be achieved on the one hand. It can be advantageous to use the coil in combination with the permanent magnet in the magnet system or to use the coil alone in the magnet system.

[0020] It can be provided that the coil is designed to be annular and has permanent magnets on both sides. The magnet system including the permanent magnet and the coil can be designed so that, without exciting the coil, the piston can be fixedly held in the end position of the magnet system or in the vicinity thereof, while by exciting the coil, the piston can move from the correspondingly occupied end position to the opposite end position. The movement triggered by exciting the coil is additionally reinforced by the force applied to the piston surface by the introduced fluid, so that the force acting on the piston is increased and the piston rod is adjusted at high speed.

[0021] Depending on the use of the adjusting device, the piston rod can be designed as a hollow body and configured as a receptacle for an actuator that passes through the piston rod along the longitudinal axis. By means of the same axial movement of the piston rod, the actuator can, for example, be coupled or decoupled from other components. The piston rod itself can also be configured as an actuator and designed to be able to make effective contact with the components.

[0022] The fluid that can be introduced into the fluid gap can be a gas or a liquid. It can be a different type of fluid, for example, it can be, but not limited to, air or oil. In order to introduce the fluid into the corresponding fluid gap, at least one fluid feeding device is provided in each fluid gap. The fluid feeding device can be used for both the inlet of the fluid and the outlet of the introduced fluid, so the fluid feeding device is also designed as a fluid outlet. In order to increase the cycle frequency, it may be advantageous that in the fluid gap, in addition to the fluid feeding device, there is correspondingly at least one fluid outlet. This allows the fluid to be discharged faster, thereby increasing the frequency of the regulating device.

[0023] It may be advantageous if the spring acts directly or indirectly on the piston rod. Depending on the arrangement of the spring, the piston rod can be moved into one of its end positions against the elastic force of the spring, or the spring or its elastic force supports the movement of the piston rod in one of its directions of movement. In a spring rod, the spring can be supported, for example, on the one hand at a shoulder of the piston rod and on the other hand at a shoulder of the housing. Depending on the design of the spring, the spring can support the piston rod in one direction or in the other. The spring can be designed as a tension spring or a compression spring. It is understood that the use of a plurality of springs is also conceivable.

[0024] In order to ensure the uniform and directional movement of the piston, in one design, at least one guide device can be provided for axially guiding at least one piston along the longitudinal axis. Such a guide device can preferably be a guide pin, for example, fixed in the housing and engaged in a hole in the piston.

[0025] In one embodiment of the invention, a cascade arrangement of a plurality of pistons with a plurality of magnet systems and a plurality of fluid gaps can be provided, wherein the piston can move back and forth between two magnet systems. This can increase the force generated. Depending on the application, any number of fluid gap systems can be connected in sequence with the magnet systems and pistons.

[0026] Depending on the use of the adjusting device and therefore on its design, it may be advantageous for the housing to be constructed in multiple parts. This simplifies the maintenance and possible replacement of components. According to the invention, the housing is made of a non-magnetic material in order to avoid flux dispersion and to concentrate the flux on the piston. It may also be provided that ferromagnetic materials are used to control the dispersion.

[0027] The adjusting device can be used for different purposes, such as, but not limited to, for the clamping of a motor spindle, a workpiece or for the rapid switching of electrical contacts.

[0028] A particularly advantageous use of the adjusting device according to the invention comprises a motor spindle, which contains an electric motor and a spindle that can be driven to rotate by the electric motor in a spindle housing, the spindle having a tool holder for a tool for machining a workpiece, wherein the spindle is constructed as a hollow shaft and has a clamping device in its longitudinal bore, which clamping device is used to fixedly clamp the tool or tool holder, wherein the housing of the adjusting device is directly or indirectly fixed to the spindle housing, and wherein a piston rod can be effectively connected to an element of the clamping device in a force- and motion-transmitting manner, the element can be axially displaced in the longitudinal bore of the spindle, and the piston rod can move the clamping device into a release position. Therefore, the present disclosure also includes a combination of the disclosed adjusting device with a motor spindle. The advantages of the described adjusting device can be applied similarly to this use or combination.

[0029] With the adjusting device according to the invention, a sufficiently large adjusting force can be achieved with a suitable structural size and acceptable weight in order to press the spring clamping group of such a tool clamp together and release the clamping device. In addition, with the device according to the invention, the holding force required to hold the tool clamp in the released position can be generated with the help of a magnet system.

[0030] The adjusting device according to the invention can be operated using resources of the motor spindle, for example possible pneumatics. This is particularly advantageous when compressed air is used as fluid, which is already used for other purposes in the motor spindle. This compressed air can also be used as an operating fluid in the adjusting device according to the invention.

[0031] The adjusting device can advantageously be arranged directly on the motor spindle. For this purpose, the adjusting device can in particular have means such as a hole or a threaded connection, which enable a quick and reversible connection to the motor spindle. However, the invention also includes embodiments in which the adjusting movement and the adjusting force are transmitted to the motor spindle via the cooperation of the adjusting device with a mechanical transmission system, such as a push-pull cable, or via a hydraulic or pneumatic transmission system, whereby the weight of the motor spindle can be kept low.

[0032] In one embodiment, the piston rod of the magnetic adjustment device comprises a rotary feed-in for passing one or more fluid channels. Through these channels, it is possible to ensure that other components are supplied through the adjustment device. For example, the fluid channel can be designed for, but not limited to, passing oil or compressed air.

[0033] In addition, it can be arranged that at least one magnet system is present in the housing wall, so that the piston that can move between its end positions interacts with at least one magnet system at at least one of its two end positions. It can also be arranged that a magnet system is present in each of the two housing walls facing the moving piston, so that the moving piston is held at its two end positions by the magnet system. That is to say, in this design, the piston can be moved to one of its two end positions at least by the operating fluid introduced into the fluid gap, and at least held there by the magnet system. For this purpose, the piston can advantageously be at least partially made of ferromagnetic material. The magnet system is preferably designed so that the pressure acting on the piston due to the introduced operating fluid can overcome the holding force of the magnet system, and the piston can move to the opposite end position. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] The present invention will be described in detail below based on the embodiments of the present invention shown in the accompanying drawings. In the accompanying drawings:

[0035] Figure 1 A first embodiment of an adjusting device with two pistons is shown, and

[0036] Figure 2 An embodiment of an adjusting device with a piston is shown. DETAILED DESCRIPTION

[0037] Figure 1 The embodiment of the magnetic adjusting device 1 is shown, which has a housing 2 having a substantially cylindrical hole extending along its longitudinal axis, which hole passes through a housing bottom 3 at one end and through a cover 4 fixed to the housing 1 at the other end. A piston rod 5 is located in the housing 2, which is supported in a manner movable in the axial direction and is designed as a hollow body.

[0038] In the embodiment shown, the housing 2 is designed in multiple parts. However, it can also be advantageous to design the housing 2 essentially in one piece. The housing cover 4 and the housing bottom 3 can be connected to the housing wall by means of screw connections (not shown).

[0039] The piston rod 5 is supported axially, for example, by a sliding bearing sleeve 6 in a manner that allows it to move along the longitudinal axis. The piston rod 5 is supported radially on the housing cover 4 and a guide member 7 arranged in the housing 2. Figure 1 As shown, the stroke of the piston rod 5 can be defined by the design of the guide element 7. However, this can also be done in other ways known to those skilled in the art.

[0040] The guide 7 is also used to guide an actuator 8 extending along the longitudinal axis through the guide 7 and the piston rod 5. A spring 9, such as a compression spring, can be arranged in the piston rod 5, which can be supported on the piston rod 5 with a first end and on the guide 7 with its second end.

[0041] The piston rod 5 has two pistons 10, which are arranged at a certain distance from each other and extend radially from the piston rod 5, and are particularly made of ferromagnetic material. The piston 10 has parallel side surfaces and a cylindrical outer surface, with which the piston 10 is supported, for example, in a sliding bushing not shown, which can be arranged in a hole of the housing 2. The piston 10 can have different thicknesses. The connection between the piston 10 and the piston rod 5 can be designed to be reversible or irreversible. In order to simplify the maintenance and disassembly of the piston 10, the piston 10 can be connected to the piston rod 5 by means of a plug connection or a threaded connection, for example. The piston 10 can move axially along the longitudinal axis with the piston rod 5, wherein a guide device 11, such as a guide pin, fixed in the housing 2 and engaged with the piston 10 can be provided. The uniform movement of the piston 10 can be ensured thereby.

[0042] The magnet system 12 is arranged between the pistons 10, and the magnet system 12 can be fixed on the housing wall, for example. The magnet system 12 can be composed of a permanent magnet or a plurality of permanent magnets polarized in the same direction in the radial direction, and therefore polarized transversely to the direction of movement of the piston rod 5. The permanent magnet can be designed as an annular magnet, for example, or it can also exist as an arrangement of single magnets polarized in the same direction. The permanent magnet can be supported by a magnet support 13 designed as a pole body. The magnet support 13 can be composed of an inner magnet support and an outer magnet support, and the magnet system 11 designed as a permanent magnet is arranged between the inner magnet support and the outer magnet support, wherein the outer magnet support is firmly fixed on the housing 2, and the inner magnet support is firmly supported on the sliding bearing sleeve 6. Other designs of permanent magnets, such as square permanent magnets, can also be used. The piston 10 and the magnet support 13 can be made of a material that conducts magnetic flux well, in particular a soft magnetic material. The piston rod 5 may also be made of a material that conducts magnetic flux, but it is preferred that the piston rod 5 be made of a non-magnetic material to offset the dispersion of the magnetic flux. The housing 2 is also made of a non-magnetic material.

[0043] Instead of or in addition to permanent magnets as magnet system 12, at least one coil (not shown) which can be connected to a power supply and has at least one winding can also be provided. This coil can, for example, be present between two individual magnets arranged on both sides and polarized in the same direction. Furthermore, for example, two or more magnet systems 12 can be arranged at right angles to the piston rod 5, in particular to the longitudinal axis, and have different compositions, i.e. different combinations of permanent magnets and / or coils are possible.

[0044] There is a fluid gap system 14 with an axially variable fluid gap 15 between the piston 10 and the magnet system 12. At least one fluid feeding device 16 leads to these fluid gaps 15 to introduce operating fluid. In one design, the fluid feeding device 16 can also be designed as an outlet, so as to feed or discharge the operating fluid, for example, in a valve-controlled manner. However, in addition to the fluid feeding device 16, a separate fluid outlet can also be provided for each fluid gap 15. In the example shown, each fluid gap 15 has two fluid feeding devices 16, which are used as feeding devices and outlets.

[0045] In order to operate the adjusting device 1, an operating fluid is introduced into the fluid gap 15 via the fluid feed device 16, thereby exerting a force on the piston surface and causing the piston 10 to move. When approaching the magnet system 12, the attractive force of the magnet system 12 also acts additionally on the piston 10 moving in the direction of the magnet system 12. After, for example, a certain amount of fluid has been introduced, the movement of the piston 10 stops and the piston 10 comes to rest at the magnet system 12, where it is stably held in its end position due to the magnetic force. Since the piston 10 is connected to the piston rod 5, the piston rod 5 also moves to its corresponding end position and exerts a force on other objects, for example through its kinetic energy, under the action of the actuator 8.

[0046] In the adjusting device 1, the piston 10 can be held with relatively great force in its two end positions on the magnet system 12 by the magnetic force of the magnet system 12. The center position of the piston 10 with an equally large fluid gap 15 is unstable.

[0047] In order to move the piston 10 held at the magnet system 12 to its relative end position, on the one hand, the operating fluid is discharged from the previously filled fluid gap 15, and on the other hand, the operating fluid is introduced into the gap 17 between the magnet system 12 and the piston 10. By the force thus acting on the piston 10 held at the magnet system 12 by the magnetic force, the piston 10 moves to its relative end position against the magnetic force. The movement of the piston 10 can be supported by introducing the operating fluid into the corresponding gap 17 near the second piston 10. That is, preferably, the two fluid gaps 15 can be filled or emptied of the operating fluid at the same time, so that the force generated by the operating fluid preferably always acts on the two pistons 10. The force acting on the piston 10 and the piston rod 5 is thereby increased.

[0048] It may be advantageous if the piston rod 5 comprises a rotary feedthrough 18 for passing through one or more fluid channels in order to supply the components passing through the regulating device 1 with the required fluid.

[0049] The adjusting device 1 can be used, for example, when replacing a tool in a motor spindle (not shown). In this case, the adjusting device 1 can be fixed to the spindle housing by means of a cover. The end of the shaft protruding from the cover can engage in the form of a push rod with a longitudinal hole in the spindle and, in the position of the piston rod 5 retracted into the housing, can lie at a small distance from an element of the clamping device, in particular the end face of the push rod of the clamping device. In this position of the adjusting device 1 described, the tool holder can be clamped by the clamping device, for example, by means of the force of a disk spring.

[0050] If the tool holder with the tool fixed thereon is to be replaced, then after the spindle has stopped, operating fluid is introduced into the fluid gap 15 and the piston rod 5 moves in the opposite direction to the direction in which the piston 10 is stably held by the magnet system 12. The piston rod 5 reaches a position further removed from the housing 2. Here, the shaft is moved in the direction of the clamping device against the force of the disc spring by means of a push rod, so that, for example, the tool holder can be released from the clamping device and the tool cone can also be loosened. In this way, the tool holder and the tool fixed thereon can be removed manually or automatically. The tool cone can be mounted directly on the processing tool or can be mounted on the tool holder.

[0051] After the new tool is inserted into the receiving portion of the spindle, the operating fluid is removed from a fluid gap 15 and introduced into the gap 17 between the magnet system 12 and the piston 10 or the gap 17 between the housing wall and the piston 10 to clamp the new tool. The spring 9 can support the movement of the piston rod 5. In other words, if the spring 9 is designed as a compression spring, the piston rod 5 moves in the direction of the housing 2 against the elastic force of the spring 9 and moves away from the housing 2 with the support of the elastic force. However, the spring 9 can also be designed as a tension spring, thereby supporting the movement of the piston rod 5 in the opposite way.

[0052] Figure 2 The design of the regulating device with only one piston is shown. For the construction of the regulating device 1, please refer to the above Figure 1. It can be provided that the adjusting device 1 has only one piston 10, which can move between two end positions and is operatively connected to the piston rod 5. At least one magnet system 12 is present in the housing wall 2, that is, in one design, the magnet system 12 can be a component of the housing. In the sense of the present invention, the magnet system can therefore be present, for example, in an integrated manner in the housing wall. Due to the magnet system 12, the piston 10, which can move between its end positions, can interact with at least one magnet system 12 at at least one of its two end positions. That is, by introducing the operating fluid into the fluid gap 15, the piston 10 is moved in the direction of one of its end positions and is held there by the at least one magnet system 12 or not held by the magnet system 12. However, the magnet system 12 can also support the movement of the at least one piston 10, that is, act on the piston 10 as a force in addition, thereby accelerating the movement of the piston 10. At the end position of the at least one piston 10, the magnet system 12 can exert a magnetic holding force on the at least one piston 10. This means that the magnet system can in particular not only act as a retaining force but also, in one embodiment, can additionally act as an accelerating force.

[0053] It can be arranged that a magnet system 12 is respectively present in the two housing parts 3, 4 facing the moving piston 10, so that the moving piston 10 is held in its two end positions by the magnet system 12. That is, the piston 10 is moved to one of its two end positions by the operating fluid introduced into the fluid gap 15 and is held there at least by the magnet system 12. For a design scheme in which the magnet system 12 is not present in the housing 2 or its components, such as the housing wall, please refer to the above Figure 1 .

[0054] The piston 10 can advantageously be made of ferromagnetic material at least partially. The magnet system 12 is preferably designed so that the pressure acting on the piston 10 due to the operating fluid introduced can overcome the holding force of the magnet system 12, and the piston 10 can move to the opposite end position. By using a coil in the magnet system 12 or using it as a special electromagnet system 12, the electromagnet system 12 can be designed to be switchable. The piston 10 as a movable structure can be fixedly maintained at two end positions without exciting the coil. If the movement of the piston 10 to the opposite end position triggered by the operating fluid introduced into the fluid gap 15 is to be supported, the coil can be energized so that the piston 10 is repelled by magnetic force, and the movement of the piston 10 is supported. Thus, the regulating device can be switched simply and quickly.

[0055] It should be noted that the accompanying drawings illustrate the present invention by way of example only and are not intended to illustrate the present invention. Figure 2The technical functional principles and features can be transferred to Figure 1 Combinations of features schematically shown in the drawings can also be obtained from the teachings of the present invention.

Claims

1. A magnetic adjusting device (1), comprising: a housing (2); a piston rod (5) movable along the longitudinal axis of the housing (2) between two end positions, the piston rod having at least one piston (10), which extends radially from the piston rod (5) and is made of ferromagnetic material or at least partially comprises ferromagnetic material; at least one magnet system (12) which is fixed to the housing, wherein: The piston (10) and the magnet system (12) form at least one fluid gap system (14), which has an axially variable fluid gap (15), and at least one fluid feeding device (16) for introducing an operating fluid is connected to the fluid gap accordingly, so that the piston rod (5) can be moved to its end position at least by introducing an operating fluid between the piston (10) and the magnet system (12).

2. The magnetic adjustment device (1) according to claim 1, characterized in that The piston rod (5) has two pistons (10) which are arranged at a distance from one another and extend radially from the piston rod (5) and are made of ferromagnetic material or at least partially comprise ferromagnetic material.

3. The magnetic adjustment device (1) according to claim 2, characterized in that: The magnet system (12) is arranged between the pistons in a manner fixed to the housing.

4. The magnetic adjustment device (1) according to claim 1, characterized in that The adjusting device comprises two magnet systems (12) which are fixed to the housing and between which the piston (10) can move and which respectively mark the end position of the piston (10).

5. A magnetic adjustment device (1) according to any one of the preceding claims, characterised in that The magnet system (12) is rotationally symmetric.

6. A magnetic adjustment device (1) according to any one of the preceding claims, characterised in that The magnet system (12) has a permanent magnet or a plurality of permanent magnets arranged in an annular manner and radially polarized in the same direction.

7. A magnetic adjustment device (1) according to any one of the preceding claims, characterised in that The magnet system (12) includes a coil associated with the magnet system (12), the coil being connectable to a power source.

8. The magnetic adjustment device (1) according to claim 7, characterized in that The coil is designed to be annular and has permanent magnets on both sides.

9. A magnetic adjustment device (1) according to any one of the preceding claims, characterised in that The magnet system (12) has radially inner and / or radially outer pole bodies, which are made of a material that conducts magnetic flux.

10. A magnetic adjustment device (1) according to any one of the preceding claims, characterised in that The magnet system (12) is a component of the housing (2).

11. A magnetic adjustment device (1) according to any one of the preceding claims, characterised in that The piston rod (5) forms a receptacle for an actuator (8) which passes through the piston rod (5) along its longitudinal axis.

12. A magnetic adjustment device (1) according to any one of the preceding claims, characterised in that The spring (9) acts directly or indirectly on the piston rod (5).

13. A magnetic adjustment device (1) according to any one of the preceding claims, characterised in that At least one guide device (11) is provided for axially guiding at least one piston (10) along a longitudinal axis.

14. A magnetic adjustment device (1) according to any one of the preceding claims, characterised in that The housing (2) is constructed from multiple parts.

15. Magnetic adjustment device (1) according to any one of the preceding claims, characterized in that The piston rod (5) comprises a rotary feedthrough (18) for passing through one or more fluid channels.

16. A magnetic adjustment device (1) according to any one of the preceding claims, characterised in that The fluid feed device (16) is also designed as a fluid outlet.

17. The magnetic adjustment device (1) according to any one of claims 1 to 15, characterized in that In addition to the fluid feed device (16), at least one fluid outlet is also present in the fluid gap (15).

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