Positioning device and position controller with the positioning device

Abstract

Positioning device for a position controller, comprising a coupling unit and at least one transmission element for transmitting a movement of an actuator of a valve to the coupling unit, wherein the at least one transmission element is configured such that the movement of the actuator is transmitted to the coupling unit as a rotational movement, wherein the coupling unit is provided for applying a restoring force to the transmission element, wherein the coupling unit comprises at least a first coupling part and at least a second coupling part, wherein the first coupling part is connected to the transmission element, and wherein the coupling unit comprises a restoring element for generating the restoring force, which applies the restoring force to the second coupling part.wherein the coupling unit comprises coupling means for an operative connection between the first coupling part and the second coupling part during movement about an axis of rotation of the coupling unit, characterized in that the first coupling part and the second coupling part are designed such that the coupling means are formed as toothings on the first coupling part and on the second coupling part that correspond to each other and act axially relative to the axis of rotation, wherein the first coupling part and the second coupling part are provided to bear against each other via the coupling means, particularly in a state unloaded by the transmission element, wherein the coupling unit comprises at least one clamping element.which applies a locking force to the first coupling part and / or the second coupling part in a region of the coupling means against a movement of the first coupling part and the second coupling part relative to each other that is essentially parallel to the axis of rotation.

Description

State of the art

[0001] Position sensor devices for positioners are already known, in which the force of an actuating movement transmitted via two coupling parts is limited, particularly to prevent damage to the positioner. The actuating movement is typically measured using a magnetic sensor, such as an AMR sensor, and a magnet. The magnet is mounted on a magnet carrier, which is firmly connected to a coupling part acting as a shaft. A lever is attached to the coupling part, converting the actuating movement into a rotary movement. A torsion spring ensures that the entire actuating movement measurement is free of play. The working range of this measurement is generally limited to approximately 190° due to this torsion spring. The angle of rotation for the rotary movement of the coupling part is limited by two stops in the housing. The rest position of the lever is not defined and can be anywhere in the range 0 - 360°.The coupling parts together form a frictional coupling. Typically, a device similar to a slip clutch is used to essentially decouple the coupling parts when excessive force is applied.

[0002] High acceleration or deceleration values, e.g. due to steam hammer in a line of a process plant containing a field device controlled by the positioner, such as a control valve, can permanently change the position of the two coupling parts relative to each other in a slip clutch with flat friction plates.

[0003] The object of the invention is to provide an improved position sensor device which has an advantageously higher resistance and robustness to high acceleration or deceleration values. Advantages of the invention

[0004] The invention is based on a position sensor device for a position controller, with a coupling unit and with at least one transmission element for transmitting a movement of an actuator of a valve to the coupling unit, wherein the at least one transmission element is designed such that the movement of the actuator is transmitted as a rotational movement to the coupling unit, wherein the coupling unit is provided to apply a restoring force to the transmission element, wherein the coupling unit comprises at least a first coupling part and at least a second coupling part, wherein the first coupling part is connected to the transmission element, wherein the coupling unit comprises a restoring element for generating the restoring force, which restoring element applies the restoring force to the second coupling part,wherein the coupling unit comprises coupling means for an operative connection between the first coupling part and the second coupling part during a movement about a rotation axis of the coupling unit.,

[0005] It is proposed that the first coupling part and the second coupling part are designed such that the coupling means are designed as toothings on the first coupling part and on the second coupling part which are each designed to correspond to one another and which act axially relative to the axis of rotation, wherein the first coupling part and the second coupling part are provided to bear against one another via the coupling means, in particular in a state not loaded by the transmission element, wherein the coupling unit comprises at least one pressing element which applies a securing force to the first coupling part and / or the second coupling part in a region of the coupling means against a movement of the first coupling part and the second coupling part relative to one another which movement is directed essentially parallel to the axis of rotation.

[0006] The position controller is intended, in particular, for position control of a valve, in particular a control valve of a process plant. The transmission element is designed, in particular, as a lever, arm, strut, or the like and is connected to a component that transmits or executes a movement of the actuator, preferably to an actuating rod and / or the actuator of the valve. The transmission element and / or the first coupling part are designed such that, when the transmission element moves, in particular due to an actuating movement, the first coupling part is subjected to a force for movement about the rotational axis.

[0007] The first coupling part and the second coupling part can each be formed as a single part or as multiple parts. Preferably, the first coupling part and the second coupling part are each formed such that, in an assembled state of the position sensor device, in particular of the coupling unit, the first coupling part and the second coupling part each act as a single component in a movement, wherein in particular the individual elements of the first coupling part and the second coupling part are connected to one another in a form-fitting, force-fitting and / or material-fitting manner and / or are arranged immovably relative to one another. Preferably, the transmission element and the first coupling part are connected to one another in a rotationally fixed manner, in particular relative to the rotation axis, for example by a form-fitting and / or force-fitting connection. The return element is preferably designed as a spring, in particular a torsion spring.The pressing element is preferably designed as a spring, in particular a compression spring.

[0008] The position controller, in particular the position sensor device, preferably comprises a sensor unit for detecting the movement of the actuator transmitted by the transmission element. The sensor unit preferably comprises at least one sensor element arranged on the first coupling part. The sensor unit can be designed, for example, as a magnetic sensor, with the sensor element being designed, for example, as a magnet. In particular, the sensor element is arranged substantially centrally to the rotation axis.

[0009] The coupling unit is preferably designed such that the first coupling part and the second coupling part are held together by the coupling means and the pressing element in a form-fitting and force-fitting manner, preventing movement about the axis of rotation relative to one another. A configuration of the coupling means and the pressing element preferably predetermines a limit force or a limit torque for transmission by the transmission element, wherein the toothings on the first coupling part and on the second coupling part are moved relative to one another against the securing force when the limit force or the limit torque is exceeded, in particular are moved apart along a direction of rotation about the axis of rotation and substantially parallel to the axis of rotation. In particular, the coupling unit is designed such that the first coupling part and the second coupling part are held together by the coupling means and the pressing element in a form-fitting and force-fitting manner, preventing movement about the axis of rotation relative to one another.of the limit torque such that the first coupling part and the second coupling part are movable or decoupled relative to one another with respect to a movement about the axis of rotation, wherein in particular the toothings of the first coupling part and the second coupling part move along one another.

[0010] The coupling means preferably comprise a first toothing arrangement formed on the first coupling part, and a second toothing arrangement formed on the second coupling part. The coupling means, in particular the first toothing arrangement and the second toothing arrangement, each comprise, in particular, a plurality of individual toothings. The fact that the toothings on the first coupling part and on the second coupling part are each formed to correspond to one another should be understood in particular to mean that the toothings on the first coupling part and on the second coupling part can be arranged one inside the other, in particular essentially completely, wherein in particular the toothings on the first coupling part can be placed flat against the toothings on the second coupling part, preferably in the state not loaded by the transmission element.Preferably, the coupling means on the first coupling part, in particular the first toothing arrangement, and the coupling means on the second coupling part, in particular the second toothing arrangement, are substantially identical in construction with regard to a dimension of the individual toothings, an angle of inclination and / or a material.

[0011] Preferably, the pressing element is designed and / or arranged such that the toothings, particularly in the state unloaded by the transmission element, are pressed against one another by the securing force. Preferably, the first coupling part and the second coupling part and the coupling means are designed such that, when the first coupling part is subjected to a force by the transmission element, the toothings of the first coupling part are moved along the toothings of the second coupling part, wherein a frictional force between the toothings of the first coupling part and the toothings of the second coupling part, as well as the securing force, counteract the force transmitted by the transmission element.

[0012] An inventive design of the position sensor device allows for advantageously high robustness against rapid force changes from the transmission element. The teeth of the two coupling parts realign themselves with each other after an acceleration or deceleration around the rotational axis has subsided due to an axial force of the contact element. To adjust the coupling, the maximum transmittable torque must be exceeded. This torque is defined by the axial force, the pitch angle of the gear teeth, and the friction between the teeth of the gear teeth. Even if the maximum transmittable force is exceeded and / or rapid force changes occur, damage to the coupling elements can thus be prevented.

[0013] It is further proposed that the first coupling part and the second coupling part be designed such that the coupling means are designed as Hirth toothing between the first coupling part and the second coupling part. This enables an advantageously simple and secure coupling between the coupling parts. In particular, the toothings are formed on the flat side. Preferably, the toothings of the first coupling part and the toothings of the second coupling part bear against one another in a form-fitting manner, particularly when not loaded by the transmission element and / or when subjected to a load by the transmission element below the limit force or the limit torque.

[0014] It is also proposed that the pressing element is designed as a compression spring and is supported at one end on the first coupling part and at the other end on the second coupling part. This makes it possible to advantageously design the position sensor device in a compact manner. In addition, an advantageously small number of different components of the position sensor device can be made possible, in particular since an additional supporting element can advantageously be omitted. The pressing element is preferably arranged coaxially to the first coupling part and the second coupling part about the axis of rotation. The pressing element is preferably arranged about the axis of rotation. In particular, the pressing element is arranged such that the axis of rotation extends centrally through the pressing element. The pressing element preferably delimits a passage, wherein the first coupling part extends at least partially through the passage.

[0015] In particular, the pressure element is arranged essentially in a sleeve-like manner around the first coupling part. The pressure element is preferably designed to be held on the first coupling part.

[0016] It is further proposed that the position sensor device comprise a support part fixed to the housing, which is in particular part of the position controller, wherein the return element is designed as a torsion spring and is supported at one end on a support part and at another end on the second coupling part, wherein the second coupling part is provided to transmit the restoring force of the return element via the coupling means to the first coupling part and to the transmission element. An advantageously compact design for integration into a housing of the position controller can be enabled. Preferably, the coupling unit is movably mounted relative to the support part. It is conceivable that the support part or another part of the position controller, in particular a housing of the position controller, is designed to hold the coupling unit in a fixed position.The return element is preferably arranged coaxially with the first coupling part and the second coupling part around the axis of rotation. The return element is preferably arranged around the axis of rotation. In particular, the return element is arranged such that the axis of rotation extends centrally through the return element. The return element preferably delimits a passage, wherein the first coupling part extends at least partially through the passage. In particular, the second coupling part is at least partially arranged in the passage of the return element. The second coupling part preferably has at least one guide section which is arranged for arrangement within the passage of the return element.In particular, the guide section is designed to hold and support the return element, wherein, in particular, a maximum radial diameter of the guide section relative to the rotation axis essentially corresponds to an inner diameter of the return element or a maximum diameter of the passage of the return element. In particular, the return element is arranged essentially in a sleeve-like manner around the first coupling part.

[0017] It is further proposed that the second coupling part delimits a passage for partially receiving the first coupling part, wherein the second coupling part is arranged such that the axis of rotation extends through the passage. This enables an advantageously compact design, in particular since the coupling parts can be arranged nested within one another. In particular, the coupling means are arranged at a distance from an inner wall of the second coupling part delimiting the passage of the second coupling part. Preferably, the first coupling part is arranged in the passage delimited by the second coupling part so as to be rotatable about the axis of rotation. The second coupling part preferably comprises at least one inner surface delimiting the passage of the second coupling part, which inner surface is intended for arrangement on an outer surface of the first coupling part and centers the first coupling part in the passage.It is conceivable for the second coupling part to form a receiving recess, with the pressure element being arranged at least partially within the receiving recess. In particular, this allows for an advantageously compact design of the coupling unit.

[0018] It is also proposed that the coupling means designed as teeth on the first coupling part and on the second coupling part are designed such that a smallest angle of inclination of the individual teeth corresponds to a value from an angular range between 15° and 65°, preferably between 20° and 50° and particularly preferably between 25° and 45°. The design of the teeth makes it possible to achieve an advantageous range for limiting the maximum torque. In addition, an advantageously robust design of the teeth can be achieved, in particular with regard to loading along a circumferential direction about the axis of rotation. If the angle of inclination is smaller, the teeth no longer center themselves when an applied force is removed. If the angle of inclination is greater, the torque of the coupling unit is no longer reliably limited.This behavior of the gear teeth depends in particular on the contact pressure element, in particular the securing force of the contact pressure element, and a friction coefficient, which is also determined in particular by the material of the first coupling part and the second coupling part. However, a certain rigidity of the contact pressure element is required, and overdimensioning of the contact pressure element due to increased material stress and a more expensive design is undesirable. Preferably, the coupling means are designed such that the angle of inclination of the individual gear teeth radially to the rotation axis is essentially constant.Preferably, the coupling means are designed such that a width of the individual toothings formed along the direction of rotation around the axis of rotation becomes smaller radially towards the axis of rotation, in particular in order to ensure a uniform distribution of an equal number of toothings in the direction of rotation around the axis of rotation at the same angle of inclination. Preferably, the coupling means are designed such that a height of the individual toothings formed parallel to the axis of rotation becomes smaller radially towards the axis of rotation, in particular in order to ensure the uniform distribution of an equal number of toothings in the direction of rotation around the axis of rotation at the same angle of inclination. Preferably, the angle of inclination of the individual toothings extends from a fictitious plane extending perpendicular to the axis of rotation to a tooth flank of the respective toothing. Preferably, all toothings are designed essentially identically.

[0019] It is further proposed that the first coupling part be constructed in multiple parts, wherein a portion of the first coupling part is connected to the transmission element and extends along the rotational axis, wherein a further portion of the first coupling part is arranged behind the second coupling part as viewed from the transmission element along the rotational axis, wherein a portion of the coupling means constructed as toothings, which are provided for interaction with the coupling means constructed on the second coupling part, is formed on a side of the further portion of the first coupling part facing the transmission element. This enables an advantageously compact design, particularly since the two coupling parts can be arranged nested one behind the other.A multi-part design of the first coupling part enables advantageously simple and rapid assembly of the coupling unit, wherein in particular the other components of the position sensor device must be arranged on or around the first coupling part. Preferably, the partial piece and the further partial piece of the first coupling part are firmly connected to one another in an assembled state of the position sensor device, in particular via a form-fitting and / or material-locking connection, such as an adhesive connection or via a form-fitting connection realized by means of undercuts. Preferably, the partial piece of the first coupling part is essentially pin-shaped or rod-shaped. In particular, the partial piece of the first coupling part extends, in particular centrally, along the axis of rotation, wherein in particular the axis of rotation comprises a central axis of the partial piece.The further section is preferably disc-shaped or knob-shaped and is connected to the section at one end of the section formed along the rotation axis. At another end formed along the rotation axis, preferably opposite the end, the section preferably has a connection area for connection to the transmission element. Particularly preferably, the pressing element, the return element, the second coupling part, and / or the support part are arranged along the rotation axis between the further section and the connection area or the transmission element, in particular when viewed perpendicular to the rotation axis.

[0020] Furthermore, it is proposed that the first coupling part is designed in several parts, wherein a section of the first coupling part is connected to the transmission element and extends along the axis of rotation, wherein the first coupling part, viewed along the axis of rotation, comprises at least one support extension formed substantially perpendicular to the axis of rotation between a connecting region of the section for connection to the transmission element and the coupling means arranged on the first coupling part, which support extension is supported on the section or is formed by the section, wherein the pressing element is arranged such that the pressing element is supported with one end on the support extension and with another end on the second coupling part. An advantageously compact design can be made possible, in particular since the two coupling parts can be arranged nested one on top of the other.In addition, an advantageously small number of different components of the position sensor device can be made possible, in particular since an additional support element can advantageously be omitted. Alternatively, it is conceivable for the first coupling part to be formed essentially in one piece and to comprise at least one support extension formed essentially perpendicular to the axis of rotation for acting on the pressing element. The support extension preferably has at least one contact surface for contacting the pressing element, which contact surface is formed, in particular at least partially, essentially flat and essentially perpendicular to the axis of rotation. It is conceivable for the support extension to be formed in one piece with the first coupling part or the sub-piece, or to be arranged as a separate component on the first coupling part or the sub-piece and to be connected to the first coupling part or the sub-piece.In a preferred embodiment, the first coupling part comprises a support element which, when arranged on the first coupling part or the partial piece, forms the support extension. The support element and / or the support extension is preferably disc-shaped and extends, in particular when arranged on the first coupling part or the partial piece, radially from an outer wall of the first coupling part or the partial piece and / or away from the axis of rotation, wherein in particular the pressing element is arranged around the first coupling part or the partial piece and bears against the support extension. It is conceivable that the support element is fastened to the first coupling part or the partial piece via a screw connection or is connected to the first coupling part or the partial piece by pressing. Alternatively, it is conceivable that the support element has a shape-flexible design and is arranged around the first coupling part orthe section is movable around it. In particular, the first coupling part or the section forms a recess on the outer wall for partially receiving the support element, wherein the support element is held in a form-fitting manner on the first coupling part or the section by its arrangement within the receptacle.

[0021] It is further proposed that the first coupling part and the second coupling part each have a contact surface for the pressure element, wherein the contact surfaces and the coupling means are each formed substantially concentrically around the axis of rotation, wherein the contact surfaces, viewed along the axis of rotation, each have a maximum diameter that is smaller than a minimum inner diameter of the coupling means. This can enable an advantageous design of the toothings with regard to robustness and force transmission. Furthermore, an advantageously compact design of the coupling unit can be enabled. In particular, the contact surface of the first coupling part is formed by the support extension. The contact surface(s) of the first coupling part and / or the second coupling part is / are each formed substantially perpendicular to the axis of rotation.The maximum diameter of the contact surfaces extends in particular substantially perpendicular to the axis of rotation. Preferably, the contact surfaces are designed such that the maximum diameter of the contact surfaces intersects the axis of rotation at one point. Preferably, the inner diameter of the coupling means extends perpendicular to the axis of rotation. Preferably, the coupling means are designed such that the minimum inner diameter is substantially identical around the axis of rotation or along a circumferential direction around the axis of rotation. Preferably, the coupling means extend radially to the axis of rotation from the inner diameter to a maximum diameter or an outer diameter of the coupling means. Preferably, the pressing element is arranged closer to the axis of rotation, as are the return element and / or the coupling means, when viewed along the axis of rotation.In particular, the second coupling part is designed such that the contact surface of the second coupling part is arranged on a side facing away from the coupling means, and in particular from the further section of the first coupling part. The coupling means of the first coupling part are preferably arranged on an outer edge region of the first coupling part, in particular of the further section, relative to the rotation axis. The coupling means of the second coupling part are preferably arranged on an outer edge region of the second coupling part relative to the rotation axis. The coupling means preferably extend, viewed along the rotation axis, up to an outer contour of the coupling unit, in particular of the first coupling part and the second coupling part.Preferably, the coupling means, in particular the individual toothings, each have a maximum radial extent corresponding to at least 5% and particularly preferably at least 8° of a maximum diameter of the coupling unit, in particular of the coupling part forming the respective coupling means. Preferably, the maximum radial extent of the coupling means, in particular the individual toothings, extends towards the axis of rotation at most up to the passage of the second coupling part and / or up to an outer wall of the first coupling part or the section of the first coupling part. In particular, an effective diameter of the coupling realized by the coupling means is between 15 mm and 25 mm in a preferred embodiment. In particular, the pressing element is designed in a preferred embodiment such that the securing force is between 30 N and 50 N.In particular, in a preferred embodiment, the clutch unit is designed such that the limit torque is at least 0.5 Nm, preferably at least 0.7 Nm and particularly preferably at least 0.85 Nm.

[0022] Furthermore, a position controller for a control valve with a position sensor device according to the invention is proposed. The position controller comprises, in particular, the sensor unit. Preferably, the position sensor device is arranged at least partially, preferably at least largely, and particularly preferably with the exception of a connecting region of the first coupling part, essentially completely, within a housing of the position controller. Preferably, the support part is formed as part of the housing of the position controller or connected thereto. The position controller is intended, in particular, for use with lift and / or rotary valves. In particular, when used on a rotary valve, the transmission element can be formed as part, in particular as an extension, of an actuating rod.In particular, when used on a rotary valve, the position controller can be designed and / or arranged such that the rotational axis of the coupling unit encompasses a rotational axis of the valve or is at least aligned substantially parallel to the rotational axis of the valve. When used with a lift valve, the position controller can be designed and / or arranged such that the rotational axis of the coupling unit is aligned substantially perpendicular to a lift axis of the valve.

[0023] An advantageously robust and reliable detection of a positioning movement can be made possible by an inventive design of the position controller.

[0024] The position sensor device and / or the position controller according to the invention should not be limited to the application and embodiment described above. In particular, the position sensor device and / or the position controller according to the invention can have a number of individual elements, components, and units that differs from the number stated herein to fulfill a function described herein. Furthermore, in the value ranges specified in this disclosure, values ​​within the stated limits are also to be considered disclosed and can be used arbitrarily. Drawings

[0025] Further advantages will become apparent from the following description of the drawings. The drawings illustrate exemplary embodiments of the invention. The drawings, the description, and the claims contain numerous features in combination. Those skilled in the art will also expediently consider the features individually and combine them into further meaningful combinations.

[0026] They show: Fig. 1: a schematic sectional view of a position sensor device according to the invention of a position controller according to the invention, Fig. 2.: a schematic uncut side view of the position sensor device according to the invention without a return element and Fig. 3.: a perspective view of a first coupling part of the position sensor device according to the invention with coupling means designed as a toothing that acts axially relative to a rotation axis. Description of the embodiment

[0027] In the Fig. 1 to 3, a position sensor device 10 is shown as part of a position controller 12 for a valve. The position sensor device 10 comprises a coupling unit 14 and a transmission element 16 for transmitting a movement of an actuator of the valve to the coupling unit 14. The position controller 12 comprises, in particular, a sensor unit 18 for detecting the movement of the actuator via a movement of a first coupling part 20 of the coupling unit 14 about a rotation axis 22 of the coupling unit 14, caused by a movement of the actuator transmitted by the transmission element 16. The sensor unit 18 comprises, for example, a magnetic sensor 24, for example an AMR sensor, which detects the movement of a magnet 26 connected to the first coupling part 20. However, other embodiments of the sensor unit 18 are also conceivable.The position sensor device 10 is arranged essentially entirely within a housing 30 of the position controller 12, with the exception of a connecting region 28 of the first coupling part 20 for connection to the transmission element 16. The position sensor device 10 preferably comprises a support part 32, which is formed as part of the housing 30 of the position controller 12 or is connected thereto. The position controller 12 is intended for use with a lift valve, wherein the transmission element 16 is designed as a lever that is rotatably arranged about the rotation axis 22 via a translational movement of the actuator along a stroke axis. The transmission element 16 is designed such that the movement of the actuator is transmitted to the coupling unit 14 as a rotational movement. The position controller 12, in particular the position sensor device 10, can alternatively also be designed / intended for use with a rotary valve.In particular, when used on a rotary valve, the position controller 12 can be designed and / or arranged such that the rotation axis 22 of the coupling unit 14 comprises a rotation axis of the valve or is at least aligned substantially parallel to the rotation axis of the valve.

[0028] The coupling unit 14 is designed to apply a restoring force to the transmission element 16. The coupling unit 14 comprises the first coupling part 20 and a second coupling part 34. The coupling unit 14 comprises a restoring element 36 for generating the restoring force, which applies the restoring force to the second coupling part 34. The coupling unit 14 comprises coupling means 38 for an operative connection between the first coupling part 20 and the second coupling part 34 during a movement about the rotational axis 22 of the coupling unit 14.

[0029] The first coupling part 20 and the second coupling part 34 are designed such that the coupling means 38 are designed as toothings on the first coupling part 20 and the second coupling part 34, each corresponding to one another and acting axially relative to the rotation axis 22. The first coupling part 20 and the second coupling part 34 are designed such that the coupling means 38 are designed as Hirth toothing between the first coupling part 20 and the second coupling part 34.

[0030] The first coupling part 20 and the second coupling part 34 are intended to bear against one another via the coupling means 38, particularly in a state not loaded by the transmission element 16. The coupling unit 14 comprises a pressing element 40, which applies a securing force to the first coupling part 20 and / or the second coupling part 34 in a region of the coupling means 38, preventing a movement of the first coupling part 20 and the second coupling part 34 relative to one another that is directed essentially parallel to the axis of rotation 22. The pressing element 40 is designed as a compression spring and is supported at one end on the first coupling part 20 and at the other end on the second coupling part 34. The pressing element 40 is arranged coaxially to the first coupling part 20 and the second coupling part 34 around the axis of rotation 22. The pressing element 40 is arranged around the axis of rotation 22.The pressing element 40 is arranged such that the rotational axis 22 extends centrally through the pressing element 40. The pressing element 40 defines a passage, with the first coupling part 20 extending at least partially through the passage. The pressing element 40 is arranged essentially in a sleeve-like manner around the first coupling part 20.

[0031] The transmission element 16 and the first coupling part 20 are connected to one another in a rotationally fixed manner, particularly relative to the rotation axis 22, for example by a positive and / or non-positive connection. In the embodiment shown in the figures, the transmission element 16 bears against the first coupling part 20 in a positive-locking manner and is secured to the first coupling part 20 by a screw nut against movement along the rotation axis 22. The return element 36 is designed as a torsion spring.

[0032] The coupling unit 14 is designed such that the first coupling part 20 and the second coupling part 34 are held together in a form-fitting and force-fitting manner by the coupling means 38 and the pressing element 40, preventing movement relative to one another about the rotation axis 22. One configuration of the coupling means 38 and the pressing element 40 predetermines a limit force or a limit torque for transmission by the transmission element 16, wherein the coupling means 38, designed as teeth, on the first coupling part 20 and on the second coupling part 34 are moved relative to one another against the securing force when the limit force or the limit torque is exceeded, in particular being moved apart along a circumferential direction 42 about the rotation axis 22 and substantially parallel to the rotation axis 22.The coupling unit 14 is designed such that, when the limit force or the limit torque is exceeded, the first coupling part 20 and the second coupling part 34 are moved such that the first coupling part 20 and the second coupling part 34 are movable or decoupled relative to one another with respect to a movement about the rotation axis 22, wherein in particular the toothings on the first coupling part 20 and on the second coupling part 34 move along one another. The coupling means 38 comprise a first toothing arrangement formed on the first coupling part 20 and a second toothing arrangement formed on the second coupling part 34, wherein the toothing arrangements each comprise all coupling means 38 designed as toothings on the respective coupling part 20, 34 having the toothing arrangement.The coupling means 38 designed as toothings are each essentially identical in construction, in particular with regard to a depth, a width, an angle of inclination 44 and a height.

[0033] The position sensor device 10 comprises the support part 32, which is fixed to the housing and is in particular part of the position controller 12, in particular of the housing 30. The return element 36 is supported at one end on the support part 32 and at the other end on the second coupling part 34. The second coupling part 34 is provided to transmit the restoring force of the return element 36 via the coupling means 38 to the first coupling part 20 and to the transmission element 16. The coupling unit 14 is movably mounted relative to the support part 32. It is conceivable that the support part 32 or another part of the position controller 12, in particular of the housing 30, is designed to hold the coupling unit 14 in a fixed position. The return element 36 is arranged coaxially to the first coupling part 20 and the second coupling part 34 around the rotation axis 22. The return element 36 is arranged around the rotation axis 22.The return element 36 is arranged such that the rotational axis 22 extends centrally through the return element 36. The return element 36 delimits a passage, wherein the first coupling part 20 extends at least partially through the passage. The second coupling part 34 is at least partially arranged in the passage of the return element 36. The second coupling part 34 has a guide section 46 which is arranged for arrangement within the passage of the return element 36. In particular, the guide section 46 is designed to hold and support the return element 36, wherein in particular a maximum radial diameter of the guide section 46 relative to the rotational axis 22 substantially corresponds to an inner diameter of the return element 36 or a maximum diameter of the passage of the return element 36.The pressure element 40 is arranged within the passage defined by the return element 36. The return element 36 is arranged essentially in a sleeve-like manner around the first coupling part 20.

[0034] The second coupling part 34 delimits a passage for partially receiving the first coupling part 20, wherein the second coupling part 34 is arranged such that the axis of rotation 22 extends through the passage. The coupling means 38 are each arranged at a distance from an inner wall of the second coupling part 34 delimiting the passage of the second coupling part 34. The first coupling part 20 is arranged rotatably about the axis of rotation 22 in the passage delimited by the second coupling part 34. The second coupling part 34 comprises an inner surface 48 delimiting the passage of the second coupling part 34, which inner surface is intended for arrangement on an outer surface of the first coupling part 20 and centers the first coupling part 20 in the passage. The second coupling part 34 forms a centering point in the vicinity of the passage of the second coupling part 34 orof the first coupling part 20 has a receiving recess 50, wherein the pressing element 40 is arranged at least partially within the receiving recess 50.

[0035] The second coupling part 34 has a stop 53 (see Fig. 2), which extends radially outwards from an outer wall of the second coupling part 34 and is intended to cooperate with an inner wall of the housing 30 in order to limit a maximum possible movement of the coupling unit 14, in particular of the second coupling part 34, about the rotation axis 22.

[0036] The first coupling part 20 is formed in several parts, wherein a section 52 of the first coupling part 20 is connected to the transmission element 16 and extends along the rotation axis 22, and a further section 54 of the first coupling part 20 is arranged behind the second coupling part 34, viewed from the transmission element 16 along the rotation axis 22. The section 52 and the further section 54 of the first coupling part 20 are in particular firmly connected to one another. Some of the coupling means 38, which are designed as toothings and are provided for interaction with the coupling means 38 formed on the second coupling part 34, are formed on a side of the further section 54 of the first coupling part 20 facing the transmission element 16. The section 52 and the further section 54 of the first coupling part 20 are firmly connected to one another when the position sensor device 10 is in the assembled state.The section 52 of the first coupling part 20 is essentially pin- or rod-shaped. The section 52 of the first coupling part 20 extends, in particular centrally, along the rotation axis 22, wherein the rotation axis 22 in particular comprises a central axis of the section 52. The further section 54 is disc-shaped and is connected to the section 52 at an end of the section 52 formed along the rotation axis 22. At an other end formed along the rotation axis 22 and opposite the end, the section 52 preferably has the connecting region 28 of the first coupling part 20 for a connection to the transmission element 16. The pressing element 40, the return element 36, the second coupling part 34 and the support part 32 are each, in particular viewed perpendicular to the rotation axis 22, arranged along the rotation axis 22 between the further section 54 and the connecting region 28 or.the transmission element 16.

[0037] The first coupling part 20, viewed along the axis of rotation 22, between the connecting region 28 for connection to the transmission element 16 and the coupling means 38 arranged on the first coupling part 20, comprises a support extension 56 which is formed substantially perpendicular to the axis of rotation 22 and which is supported on the partial piece 52. The pressing element 40 is arranged such that the pressing element 40 is supported with one end on the support extension 56 and with the other end on the second coupling part 34. The support extension 56 has a contact surface 58 for contacting the pressing element 40, which is formed substantially flat and substantially perpendicular to the axis of rotation 22. The first coupling part 20 comprises a support element 60 which, when arranged on the partial piece 52, forms the support extension 56. The support element 60 orThe support extension 56 is disc-shaped and extends, particularly when arranged on the partial piece 52, radially outwardly from an outer wall of the partial piece 52, wherein the pressing element 40 is arranged around the partial piece 52 and bears with one end against the support extension 56, particularly the contact surface 58 of the support extension 56. The support element 60 is designed as a circular ring-shaped sheet metal part and has a flexible design. The support element 60 can be moved around the partial piece 52 by bending. The partial piece 52 forms a recess on the outer wall for partially receiving the support element 60, wherein the support element 60 is held in a form-fitting manner on the partial piece 52 by its arrangement within the receptacle. Alternatively, it is conceivable that the support element 60 is fastened to the first section 52 via a screw connection or is connected to the section 52 via pressing.

[0038] Alternatively, it is conceivable that the first coupling part 20 is formed substantially in one piece and comprises at least one support extension 56 formed substantially perpendicular to the rotation axis 22 for acting upon the pressing element 40. It is conceivable that the support extension 56 is formed in one piece with the first coupling part 20 or the section 52 or is arranged as a separate component on the first coupling part 20 or the section 52 and is connected to the first coupling part 20 or the section 52.

[0039] The first coupling part 20 and the second coupling part 34 can each be formed as a single piece or in multiple parts. Preferably, the first coupling part 20 and the second coupling part 34 are each designed such that, in an assembled state of the position sensor device 10, in particular of the coupling unit 14, the first coupling part 20 and the second coupling part 34 each act as a single component in a movement, wherein, in particular, the individual elements of the first coupling part 20 and the second coupling part 34 are connected to one another in a form-fitting, force-fitting, and / or material-fitting manner and / or are arranged immovably relative to one another.

[0040] The first coupling part 20 and the second coupling part 34 each have a contact surface 58, 62 for applying the pressure element 40, wherein the contact surfaces 58, 62 and the coupling means 38 are each formed substantially concentrically around the axis of rotation 22. The contact surfaces 58, 62 each have a maximum diameter 64, viewed along the axis of rotation 22, which is smaller than a minimum inner diameter 66 of the coupling means 38. The contact surface 58 of the first coupling part 20 is formed by the support element 60 or the support extension 56. The contact surface 62 of the second coupling part 34 is arranged within the receiving recess 50. The contact surfaces 58, 62 of the first coupling part 20 and the second coupling part 34 are each formed substantially perpendicular to the axis of rotation 22. The maximum diameter 64 of the contact surfaces 58, 62 extends essentially perpendicular to the rotation axis 22.The contact surfaces 58, 62 are designed such that the maximum diameter 64 of the contact surfaces 58, 62 each intersects the axis of rotation 22 at a single point. The inner diameter 66 of the coupling means 38 extends perpendicular to the axis of rotation 22. The coupling means 38 are designed such that the inner diameter 66 of the coupling means 38 is substantially identical when viewed along the direction of rotation 42. The pressure element 40 is arranged closer to the axis of rotation 22, as are the return element 36 and the coupling means 38, when viewed along the axis of rotation 22. The second coupling part 34 is designed such that the contact surface 62 of the second coupling part 34 is arranged on a side facing away from the coupling means 38, and in particular from the further section 54 of the first coupling part 20.

[0041] The coupling means 38 of the first coupling part 20 are arranged on an outer edge region of the first coupling part 20, in particular of the further section 54, relative to the rotation axis 22. The coupling means 38 of the second coupling part 34 are arranged on an outer edge region of the second coupling part 34, relative to the rotation axis 22. The coupling means 38 each extend along the rotation axis 22 up to an outer contour of the coupling unit 14, in particular of the first coupling part 20 and the second coupling part 34. Preferably, the coupling means 38, in particular the individual toothings, each have a maximum radial extent 68 (see Fig. 3), which corresponds to at least 5%, preferably at least 10%, and particularly preferably at least 15°, of a maximum diameter 70 of the coupling unit 14, in particular of the coupling part 20, 34 forming the respective coupling means 38. Preferably, the maximum radial extension 68 of the coupling means 38, in particular the individual toothings, amounts to at most 25% of the maximum diameter 70 of the coupling unit 14, in particular of the coupling part 20, 34 forming the respective coupling means 38.

[0042] In Fig. 2 shows a schematic side view of the position sensor device 10, with the reset element 36 hidden for clarity. In Fig.Figure 3 shows a perspective view of the first coupling part 20, wherein the toothings formed on the first coupling part 20 are visible. The coupling means 38 formed as toothings on the first coupling part 20 and on the second coupling part 34 are designed such that a minimum angle of inclination 44 of the individual toothings corresponds to a value from an angular range between 15° and 65°. In particular, the minimum angle of inclination 44 of the individual toothings corresponds substantially to 35°.The coupling means 38 are designed such that the angle of inclination 44 of the individual toothings radially to the axis of rotation 22 is essentially constant, wherein a width 74 of the individual toothings formed along the direction of rotation 42 around the axis of rotation 22 and a height 76 of the individual toothings formed parallel to the axis of rotation 22 become smaller radially towards the axis of rotation 22, in particular in order to ensure a uniform distribution of an equal number of toothings in the direction of rotation 42 around the axis of rotation 22 with the same angle of inclination 44. The angle of inclination 44 of the individual toothings extends from a fictitious plane extending perpendicular to the axis of rotation 22 to a tooth flank 72 of the respective toothing. Preferably, all coupling means 38 designed as toothings are designed essentially identically.

[0043] Further alternative embodiments of the position sensor device 10 are conceivable, which differ in the design of the individual components and / or in the arrangement of the components relative to one another. Reference symbol 10 Position transmitter device 12 positioners 14 Coupling unit 16 transmission element 18 Sensor unit 20 First coupling part 22 Rotation axis 24 sensors 26 Magnet 28 Connection area 30 housings 32 Support part 34 Second coupling part 36 Reset element 38 coupling agents 40 pressure element 42 Direction of rotation 44 inclination angles 46 Guide Section 48 inner surface 50 Recess 52 section 53 stop 54 Further section 56 supporting process 58 mooring area 60 support element 62 mooring area 64 diameter 66 Radial distance 68 Radial extension 70 diameter 72 tooth flank 74 width 76 height

Claims

[1] Position sensor device for a position controller, with a coupling unit and with at least one transmission element for transmitting a movement of an actuator of a valve to the coupling unit, wherein the at least one transmission element is designed such that the movement of the actuator is transmitted as a rotational movement to the coupling unit, wherein the coupling unit is provided to apply a restoring force to the transmission element, wherein the coupling unit comprises at least a first coupling part and at least a second coupling part, wherein the first coupling part is connected to the transmission element, wherein the coupling unit comprises a restoring element for generating the restoring force, which restoring element applies the restoring force to the second coupling part,wherein the coupling unit comprises coupling means for an operative connection between the first coupling part and the second coupling part during a movement about a rotation axis of the coupling unit, , characterized byin that the first coupling part and the second coupling part are designed such that the coupling means are designed as toothings on the first coupling part and on the second coupling part which are each designed to correspond to one another and which are axially effective relative to the axis of rotation, wherein the first coupling part and the second coupling part are provided to bear against one another via the coupling means, in particular in a state not loaded by the transmission element, wherein the coupling unit comprises at least one pressing element which applies a securing force to the first coupling part and / or the second coupling part in a region of the coupling means against a movement of the first coupling part and the second coupling part relative to one another which movement is directed essentially parallel to the axis of rotation. [2] Position sensor device according to claim 1, characterized bythat the first coupling part and the second coupling part are designed such that the coupling means are designed as Hirth toothing between the first coupling part and the second coupling part. [3] Position sensor device according to claim 1 or 2, characterized by that the pressure element is designed as a compression spring and is supported with one end on the first coupling part and with another end on the second coupling part. [4] Position sensor device according to one of the preceding claims, characterized bya housing-fixed support part, which is in particular part of the position controller, wherein the return element is designed as a torsion spring and is supported with one end on the support part and with another end on the second coupling part, wherein the second coupling part is provided to transmit the restoring force of the return element via the coupling means to the first coupling part and to the transmission element. [5] Position sensor device according to one of the preceding claims, characterized by that the second coupling part defines a passage for partially receiving the first coupling part, wherein the second coupling part is arranged such that the axis of rotation extends through the passage. [6] Position sensor device according to one of the preceding claims, characterized bythat the coupling means designed as toothing on the first coupling part and on the second coupling part are designed such that a smallest angle of inclination of the individual toothings, which in particular extends from a fictitious plane extending perpendicular to the axis of rotation to a tooth flank of the respective toothing, corresponds to a value from an angular range between 15° and 65°. [7] Position sensor device according to one of the preceding claims, characterized bythat the first coupling part is designed in several parts, wherein a part of the first coupling part is connected to the transmission element and extends along the axis of rotation, wherein a further part of the first coupling part is arranged behind the second coupling part when viewed from the transmission element along the axis of rotation, wherein a part of the coupling means designed as toothings, which are provided for interaction with the coupling means designed on the second coupling part, are formed on a side of the further part of the first coupling part facing the transmission element. [8] Position sensor device according to one of the preceding claims, characterized bythat the first coupling part is designed in several parts, wherein a part of the first coupling part is connected to the transmission element and extends along the axis of rotation, wherein the first coupling part, viewed along the axis of rotation, comprises at least one support extension formed substantially perpendicular to the axis of rotation between a connecting region of the part for connection to the transmission element and the coupling means arranged on the first coupling part, which support extension is supported on the part or is formed by the part, wherein the pressing element is arranged such that the pressing element is supported with one end on the support extension and with another end on the second coupling part. [9] Position sensor device according to claim 3, characterized bythat the first coupling part and the second coupling part each have a contact surface for the pressure element, wherein the contact surfaces and the coupling means are each formed substantially concentrically around the axis of rotation, wherein the contact surfaces, viewed along the axis of rotation, each have a maximum diameter which is smaller than a minimum inner diameter of the coupling means. [10] Position controller for a control valve with a position sensor device according to one of the preceding claims.

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