Actuator with an electric motor

Abstract

The invention relates to an actuator (1) for automation technology designed to actuate a fitting, such as a valve for example, the actuator having an output force measuring device (70), which output force measuring device is designed to measure a mechanical propelling force, causing the movement of an output, from a deflection of a resiliently mounted device from an inoperative position, the electronic operating circuit being designed to derive a drive efficiency of the actuator from force measurement values relating to the output movement and a mechanical motor force.

Description

[0001] PC 250911 C June 12, 2025 Actuator with Electric Motor The invention relates to an actuator for automation technology with an electric motor for actuating a valve. Such actuators are also used in automation technology to actuate valves, such as fittings. For example, DE102019134805A1 discloses an actuator in which a motor current is used to determine a motor temperature. In actuators with electric motors, the drive train of an actuator is subjected to heavy loads over time, so that wear and tear reduces the efficiency of the actuator. The object of the invention is to propose an actuator thatin which the efficiency of the actuator can be measured. The problem is solved by an actuator according to independent claim 1. An actuator according to the invention for automation technology, configured for actuating a fitting such as a valve, comprises: A housing with at least one housing wall; An electric motor; An electronic operating circuit for operating the actuator and, in particular, the electric motor; An output with an output shaft, which output is configured to actuate a fitting by means of an axial movement or a rotary movement of the output shaft; A gearbox configured for transmitting a force or torque to the output, wherein the gearbox has several gear teeth such as gears or worms.which are supported by gear carriers such as gear axles or gear shafts; wherein the electric motor, gearbox and electronic operating circuit are arranged in the actuator housing, wherein the electric motor is configured to move the output linearly or rotaryally by means of the gearbox, wherein the actuator has a device resiliently mounted in the actuator housing by means of a spring device, which resiliently mounted device is formed by the output or by a gear part or by a gear carrier, wherein the actuator has an output force measuring device, which output force measuring device is configured to measure a mechanical propulsive force causing the movement of the output from a deflection of the resiliently mounted device from a rest position, wherein the electronic operating circuit is configured toTo derive the drive efficiency of the actuator from force measurements relating to the drive movement and from measured values ​​of a mechanical motor force, PC 250911 C 3 / 27 June 12, 2025, where the measured values ​​of the mechanical motor force are derived from measured values ​​of a mechanical quantity such as a mechanical deformation or mechanical stress caused by motor actuation. By comparing a tractive force necessary for movement of the output, which is independent of the efficiency of the actuator, with a motor force applied or generated by the electric motor, the drive efficiency of the actuator can be deduced. From the measured drive efficiency,Wear in the actuator can be detected, in particular, by a change in drive efficiency over time. If wear is detected or a long-term change in efficiency occurs, the electronic operating circuit can, for example, be configured to issue a warning message. This allows, for instance, a plant operator to replace an affected actuator if maintenance can be easily performed on the system. This avoids costly emergency shutdowns or malfunctions. Regarding the force or torque flow through the gearbox, the motor force measurement takes place at the motor end or upstream of the gearbox. The electronic operating circuit comprises several functionalities, each implemented in different circuit sections. One such functionality, for example, concerns the operation of the electric motor.Another functionality concerns the determination of the drive efficiency. In one embodiment, a motor force measuring device is configured to detect motor-side mechanical deformation or mechanical stress caused by actuation of the electric motor PC 250911 C 4 / 27 12 June 2025 by means of a transducer. Detection includes measuring and outputting measured values ​​or generating and outputting a measurement signal regarding the mechanical deformation or mechanical stress. The motor force measuring device utilizes the fact that, when the motor is actuated, a mechanical, usually elastic,Deformation of actuator components, such as a motor housing wall, an actuator housing wall, or a gear carrier connected to the electric motor, or an associated gear section of the electric motor, is caused by this deformation. Measuring this deformation allows conclusions to be drawn about the generated or applied motor force. The evaluation of the measured values ​​can be carried out by the motor force measuring device or by the electronic operating circuit. In one embodiment, the motor force measuring device is configured to detect deformation of at least one of the following components: a motor housing wall, an actuator housing wall, a gear carrier connected to the electric motor, or an associated gear section. In one embodiment, the output force measuring device is configured to...A deflection of the spring-mounted device from its rest position against the spring device in PC 250911 C 5 / 27, June 12, 2025, to convert a deflection-dependent measurement signal of an electronic measured quantity such as inductance, capacitance, current, or voltage, wherein the output force measuring device or the electronic operating circuit is configured to derive or calculate a measured value for the thrust force from the measurement signal. In one embodiment, the output force measuring device has a sensor for generating the measurement signal, for example, with a coil, a capacitor or a capacitor plate, or a photodiode, wherein the output force measuring device has a pickup arm which is configured toto be moved along by an axial or rotational movement of the spring-mounted device and thereby cause a change in the measurement signal of the electronic measured quantity. In one embodiment, the output force measuring device has a lever device with a lever bearing and with a first end and an opposite second end with respect to the lever bearing, wherein the gripping arm forms the first end, and the second end is configured to influence a measured value of the electronic measured quantity depending on its position, wherein the lever length of the first end is, in particular, shorter than the lever length of the second end. A shorter lever length of the first end allows a small deflection of the spring-mounted device to be translated into a larger change in the measurement signal. PC 250911 C 6 / 27 June 12, 2025. In one embodiment, the sensor has an end face, and the second end is configured toto at least partially cover the front surface, wherein the degree of coverage depends on the thrust force against the spring device, wherein the sensor comprises a coil, wherein the second end is permanently magnetic or electrically conductive, wherein the second end is configured to influence an inductance of the coil and the second end, or wherein the sensor comprises a capacitor plate, wherein the second end is electrically conductive, wherein the second end is configured to influence a capacitance of the capacitor plate and the second end, or wherein the sensor comprises a photodiode, wherein the second end is configured to attenuate or block incident light, for example, from an LED. In one embodiment, the second end is disk-shaped. In one embodiment, measured values ​​of the measurement signal occupy a range of values ​​with a maximum value and a minimum value.wherein a measured value of the measurement signal in a force-free state of the output assumes a value which is less than 30%, and in particular less than 25%, and preferably less than 20% of a difference between the maximum and minimum values ​​from a mean value of the value range. In this way, a deflection of the spring-mounted device in both directions can be detected with sufficient detection margin. PC 250911 C 7 / 27 12 June 2025 In one embodiment, the spring device has at least a first spring element and at least a second spring element, wherein the at least one first spring element is configured to exert a force against a deflection of the output from the rest position in a first direction, and wherein the at least one second spring element is configured to exert a force against a deflection of the output from the rest position in a second direction.to effect a direction opposite to the first direction. In one embodiment, the spring-mounted device is formed by the output shaft, wherein a cross-sectional plane of the first spring element and a cross-sectional plane of the second spring element are separated by a distance of less than 30%, and in particular less than 25%, and preferably less than 20% of the diameter of the first spring element or the second spring element. In this way, the spring-mounted device can be designed compactly. In one embodiment, the output shaft is designed as a threaded spindle, wherein the threaded spindle is rotationally fixed, wherein the output shaft has a spindle nut, and wherein the electric motor is configured to drive the spindle nut rotationally by means of the gearbox and thereby move the threaded spindle axially.PC 250911 C 8 / 27 June 12, 2025, wherein the output shaft in the actuator housing is resiliently mounted in an axial direction of the threaded spindle by means of the spring device. In one embodiment, the spindle nut is radially mounted by means of a rolling bearing, which rolling bearing is arranged at least partially in a cylindrical recess in the actuator housing wall, wherein the cylindrical recess provides a stop for the rolling bearing against movement in the direction of a side of the cylindrical recess facing away from the actuator housing, wherein the rolling bearing, when the output shaft is in the rest position, touches the stop and / or is preloaded against the stop.wherein the at least one first spring element and the at least one second spring element act against the rolling bearing on a side of the rolling bearing facing the actuator housing. This contributes to a compact design of the actuator. In one embodiment, the actuator has a spring plate fixed in the actuator housing with a central opening through which the spindle nut is guided, wherein the spindle nut has a radial projection, in particular a collar, on a side of the spring plate facing away from the actuator housing, which is configured to act directly or indirectly as a stop against the spring plate, wherein the spring plate is designed as one of the at least one first spring element. PC 250911 C 9 / 27 12 June 2025 This contributes to a compact design of the actuator. In one embodiment, the spring plate is arranged outside the cylindrical recess,wherein the radial shape acts against the spring plate via the rolling bearing. In one embodiment, the transmission has a first gear element, such as a gear, which is rotationally fixed to the spindle nut, wherein the spring device has at least one disc spring, which encompasses the spindle nut and is designed as at least one of the at least one second spring element, wherein the at least one disc spring is arranged and clamped between the first gear element and the rolling bearing. In one embodiment, the electric motor has a drive and a motor housing, wherein the drive is located in and supported by the motor housing, wherein the motor housing is supported by the actuator housing wall, and wherein the motor force measuring device has a transducer which is configured toto measure a deformation of a motor housing wall or the actuator housing wall caused by the operation of the motor, wherein the measuring transducer has, for example, a strain gauge. The invention is described below with reference to exemplary embodiments. Fig. 1 shows a cross-section through an exemplary actuator according to the invention. PC 250911 C 10 / 27 June 12, 2025. Fig. 2 shows a detail enlargement of the actuator shown in Fig. 1. Fig. 3 shows a cross-section through an exemplary actuator according to the invention. Figs. 4 a) and b) sketch sensors of an actuator according to the invention. Fig. 5 shows an exemplary embodiment of a motor force measuring device according to the invention. Fig. 1 shows a cross-section through an exemplary actuator 1 according to the invention comprising an actuator housing 10 with an actuator housing wall 11, wherein an electric motor 20 is located in the actuator housing.An electronic operating circuit 30 for operating the electric motor, a gearbox 50, and an output 40 are arranged. The output has an output shaft 41 or output axle 42, and the output is configured to actuate a fitting by means of an axial movement or a rotary movement of the output shaft or output axle. The gearbox 50 is configured to transmit a force or torque from the electric motor to the output and has gear elements 51, such as gears 51.1 or worms 51.2, which are mounted on gear carriers 52, such as gearbox shafts 52.1 or gearbox axles 52.2. The electric motor is configured to move the output axially or rotaryally. The actuator has a spring-mounted device 61.which is resiliently mounted by means of a spring device 60. The resiliently mounted device is formed, as shown here, by the output or alternatively by one of the gear parts or by one of the gear part carriers. According to the invention, the actuator has an output force measuring device 70, which is configured to measure a mechanical force causing the movement of the output from a deflection of the resiliently mounted device from a rest position, wherein the electronic operating circuit is configured to derive a drive efficiency of the actuator from force measurements with respect to the output movement and from the mechanical motor force determined by means of a motor force measuring device 75 (see Fig. 5). The motor force measuring device utilizes,that when the motor is actuated, a mechanical deformation of actuator components or actuator parts, such as the motor housing wall 22.1 (see Fig. 5) or the actuator housing wall 11 or a gear carrier 52 connected to the electric motor, is caused compared to an unloaded or unactuated state. Measuring this deformation allows conclusions to be drawn about the generated or applied motor force. By comparing a tractive force required for movement of the output, which is independent of the actuator's efficiency, with a force applied or generated by the electric motor, the actuator's drive efficiency can be determined. From the measured drive efficiency,Wear in the actuator can be detected, in particular, from a change in the drive efficiency over time. If wear is detected or a long-term change in efficiency is observed, the electronic operating circuit can, for example, be configured to issue a warning message. In this way, a plant operator can, for example, replace an affected actuator if maintenance can be easily performed on the plant. This can prevent an expensive emergency shutdown or a malfunction of the plant. In one embodiment, the output force measuring device 70 of an exemplary actuator according to the invention is configured to convert a deflection of the spring-mounted device 61 from its rest position against the spring device 60 into a deflection-dependent measurement signal of an electronic measured quantity such as inductance, capacitance, current, or voltage.wherein the output force measuring device or the electronic operating circuit 30 is configured to derive or calculate a measured value for the force from the measurement signal. The actuator housing 10 can, for example, be modular, with individual housing modules being spatially separated from one another (not shown). For example, the electronic operating circuit can be arranged in a different housing module than the electric motor. Fig. 2 shows a section of the cross-section of the actuator 1 shown in Fig. 1. The output 40 of the actuator 1 can, as shown here, comprise a spindle-shaped output shaft 41 with a spindle nut 43, which spindle nut is driven via the gearbox by means of a gear 51.1.to move the output axis axially. The output force measuring device can, as shown here, detect the axial movement of the output axis, for example via the spindle nut 43, using a lever device 72 with a gripping arm 72.11. The output force measuring device, as shown here by way of example, has the lever device 72 with a lever bearing 72.01 and with respect to the lever bearing a first end 72.1 and, in particular, an opposing second end 72.2, wherein the gripping arm forms the first end, and the second end PC 250911 C 13 / 27 June 12, 2025 is configured to influence a measured value of the electronic quantity depending on its position, wherein the lever length of the first end is in particular shorter than the lever length of the second end. A sensor 70.1 of the output force measuring device is configured toto generate a measurement signal corresponding to the propulsive force. A sensor element 71 of the sensor can have an end face 71.1, wherein the second end 72.2 is configured to at least partially cover the end face, the degree of coverage depending on the propulsive force against the spring device and influencing the measurement signal. Measured values ​​of the measurement signal occupy a range with a maximum value and a minimum value, wherein in one embodiment a measured value of the measurement signal in a force-free state of the output assumes a value which is less than 30%, and in particular less than 25%,and preferably less than 20% of the difference between the maximum and minimum values ​​is away from a mean value of the value range. In this way, a deflection of the spring-mounted device in both directions can be detected with sufficient detection margin. The spring device 60 can, as shown here, have at least one first spring element 60.1 and at least one second spring element 60.2, wherein the at least one first spring element is configured to exert a force against a deflection of the output 40 from the rest position in a first direction, and wherein the at least one second spring element is configured to exert a force against a deflection of the output from the rest position in a second direction opposite to the first. The spindle nut 43 can be radially mounted by means of a rolling bearing 80, as shown here.which rolling bearing is at least partially arranged in a cylindrical recess 11.1 of the actuator housing wall, wherein the cylindrical recess provides a stop 11.11 for the rolling bearing against movement towards a side of the cylindrical recess facing away from the actuator housing, wherein the rolling bearing, when the output 40 is in the rest position, touches the stop and / or is preloaded against the stop, wherein the at least one first spring element 60.1 and the at least one second spring element 60.2 act against the rolling bearing on a side of the rolling bearing facing the actuator housing, wherein the rolling bearing 80 is arranged in a cylindrical recess 11.1 of the actuator housing wall 11. The cylindrical recess provides a stop 11.11 for the rolling bearing. A spring plate 90, fixed in the actuator housing, has a central opening 91 through which the spindle nut 43 is guided.wherein the spindle nut has a radial projection 43.1, in particular a collar, on a side of the spring plate facing away from the actuator housing, which is configured to act directly or indirectly as a stop against the spring plate, the spring plate being designed as one of the at least one first spring element 60.1. The spring plate 90 is arranged outside the cylindrical recess 11.1, the radial projection 43.1 acting against the spring plate via the rolling bearing 80. One of the gear elements of the transmission 50 is rotationally fixed to the spindle nut 43, the spring device 60 having at least one disc spring, which surrounds the spindle nut and is designed as at least one of the at least one second spring element 60.2.wherein the at least one disc spring is arranged and clamped between the first gear element and the rolling bearing. In this way, the spring device 60 can be implemented compactly. Fig. 3 shows a cross-section through an exemplary actuator 1, which, according to the invention, can be equipped with an output force measuring device. The electric motor 20 is configured to drive an output 40 with a gear 44 via a gearbox 50 with a worm 51.2 as a gear element 51, wherein the worm is designed as a spring-mounted device 61.which is resiliently mounted and clamped by a spring device 60 with a first spring element 60.1 and a second spring element 60.2 opposite the worm gear. The worm gear engages with the gear 44 and is deflected against the spring device according to the thrust force transmitted by the electric motor. According to the invention, an output force measuring device can also be installed in this actuator, which detects the deflection of the worm gear against the spring device. In Figs. 4 a) and 4 b), sensor elements 71 are schematically sketched. The sensor element can, as shown in Fig. 4 a), have a coil 71.2, wherein the second end is permanent magnetic and / or electrically conductive, and wherein the second end is configured to influence an inductance of the coil and the second end. The sensor element can, as shown in Fig. 4 b), have a capacitor plate 71.3, wherein the second end is electrically conductive.wherein the second end is configured to influence the capacitance of the capacitor plate and the second end. Alternatively, the sensor element can comprise a photodiode 71.4, wherein the second end is configured to attenuate or block an incident light, for example, generated by an LED. Fig. 5 shows an exemplary motor force measuring device 75 according to the invention. An electric motor 20 is mounted on the actuator housing wall 11 via a motor housing 22 with a motor housing wall 22.1. The mounting of the electric motor can, for example, be formed on an inner section of the actuator housing wall 11. A drive 21 of the electric motor is arranged in the motor housing 22 and held by the motor housing. The drive is configured to drive a gear carrier 52,to effect a force or torque flow via the gearbox 50 to the output 40. When the electric motor is actuated, the drive causes a deformation of the motor housing wall, the actuator housing wall, and the gear carrier 52 connected to the electric motor. The deformation of the motor housing wall can be determined by means of a transducer 76, for example, comprising a strain gauge 76.1, as shown here. Alternatively or additionally, a transducer can also be arranged, as shown here, on the actuator housing wall 11 and / or on the gear carrier 52 or an associated gear section (not shown) arranged on the gear carrier. The motor force measuring device 75 can, as shown here, have a weakening 22.2, for example, via a notch or local depression or reduction in the motor housing wall 22.1 or the actuator housing wall 11 (not shown).which amplifies a deformation caused by motor operation in order to enhance a measurement effect. Alternatively or additionally to a strain gauge, the deformation measuring device can, for example, also include an inductive, capacitive, or optical sensor, which is configured to detect a change in its inductance or capacitance, or an optical measurement such as birefringence, when deformation is caused by the electric motor. Alternatively or additionally, the drive 21 of the electric motor can be mounted in the motor housing with a rotational spring (not shown), whereby a deflection from a rest position allows conclusions to be drawn about the applied motor force. The invention is not limited to the embodiments shown in the figures; features of the embodiments may include,so that they can be exchanged among each other in a technically meaningful way. / Reference symbol list,

[0002] PC 250911 C 18 / 27 June 12, 2025 Reference List 1 Actuator 10 Actuator Housing 11 Actuator Housing Wall 11.1 Cylindrical Recess 11.11 Stop 20 Electric Motor 21 Drive 22 Motor Housing 22.1 Motor Housing Wall 22.2 Attenuation 30 Electronic Operating Circuit 40 Output 41 Output Shaft 42 Output Shaft 43 Spindle Nut 43.1 Radial Shape 44 Gear 50 Gearbox 51 Gear Components 51.1 Gear 51.2 Worm 52 Gear Component Carrier 52.1 Gear Shaft 52.2 Gear Shaft 60 Spring Device 60.1 First Spring Element 60.2 Second Spring Element 61 Spring-Mounted Device 70 Output Force Measuring Device 70.1 Sensor 71 Sensor Element 71.1 End Face 71.2 Coil PC 250911 C 19 / 27 June 12, 2025 71.3 Capacitor plate 71.4 Photodiode 72 Lever device 72.01 Lever bearing 72.1 First end 72.11 Pick-up arm 72.2 Second end 75 Motor force measuring device 76 Measuring transducer 76.1 Strain gauge 80 Rolling bearing 90 Spring plate 91 Central opening / Claims

Claims

PC 250911 C 20 / 27 June 12, 2025 Claims 1. Actuator (1) of automation technology configured for actuating a fitting such as a valve, comprising: An actuator housing (10) with at least one actuator housing wall (11); An electric motor (20); An electronic operating circuit (30) for operating the actuator and in particular the electric motor; An output (40) with an output axis (41) or output shaft (42), which output is configured to actuate a fitting by means of an axial movement or a rotary movement of the output axis or output shaft;A gearbox (50) configured for transmitting a force or torque from the electric motor to the output, wherein the electric motor, gearbox and electronic operating circuit are arranged in the actuator housing, wherein the electric motor is configured to move the output axially or rotationally by means of the gearbox, wherein the actuator has a device (61) which is resiliently mounted in the actuator housing by means of a spring device (60), which resiliently mounted device is formed by the output or by one of the gear parts or by one of the gear part carriers, characterized in that the actuator has an output force measuring device (70); PC 250911 C 21 / 27 June 12, 2025, which output force measuring device is configured to measure a mechanical propulsive force causing the movement of the output from a deflection of the spring-mounted device from a rest position, wherein the electronic operating circuit is configured to derive a drive efficiency of the actuator from force measurements relating to the output movement and from measured values ​​of a mechanical motor force, wherein the measured values ​​of the mechanical motor force are derived from measured values ​​of a mechanical quantity such as a mechanical deformation or mechanical stress caused by motor actuation.

2. Actuator according to claim 1, wherein a motor force measuring device (75) is configured to measure a mechanical deformation or mechanical stress caused by actuation of the electric motor by means of a transducer (76), 3.Actuator according to claim 2, wherein the motor force measuring device is configured to detect a deformation of at least one of the following components: a motor housing wall (22.1), an actuator housing wall (11), a gear carrier (52) adjoining the electric motor or an associated gear part (51). PC 250911 C 22 / 27 June 12, 2025 4. Actuator according to one of the preceding claims, wherein the output force measuring device (70) is configured to convert a deflection of the spring-mounted device (61) from the rest position against the spring device (60) into a deflection-dependent measurement signal of an electronic measured quantity such as inductance, capacitance, current, or voltage, wherein the output force measuring device or the electronic operating circuit (30) is configured to derive or calculate a measured value for the thrust force from the measurement signal.

5. Actuator according to claim 4, wherein the output force measuring device (70) has a sensor (70.1) for generating the measurement signal with, for example, a coil, a capacitor, or a photodiode, wherein the output force measuring device has a sampling arm (72).11) which is configured to be moved along with an axial or rotational movement of the spring-mounted device and thereby cause a change in the measurement signal of the electronic measured quantity.

6. Actuator according to claim 5, wherein the output force measuring device has a lever device (72) with a lever bearing (72.01) and with a first end (72.1) and, in particular, an opposing second end (72.2) with respect to the lever bearing, wherein the gripping arm forms the first end, wherein the second end is configured to influence a measured value of the electronic measured quantity depending on its position. PC 250911 C 23 / 27 June 12, 2025, wherein a lever length of the first end is in particular smaller than a lever length of the second end.

7. Actuator according to claim 6, wherein the sensor (70.1) has a sensor element (71) with an end face (71.1), wherein the second end (72.2) is configured to at least partially cover the end face, wherein a coverage fraction depends on the thrust force against the spring device, wherein the sensor element has a coil (71.2), wherein the second end is permanent magnetic and / or electrically conductive, wherein the second end is configured to influence an inductance of the coil and the second end, or wherein the sensor element has a capacitor plate (71.3), wherein the second end is electrically conductive, wherein the second end is configured to influence a capacitance of the capacitor plate and the second end, or wherein the sensor element has a photodiode (71.4) having a second end configured to attenuate or block light incidence, for example, by an LED.

8. Actuator according to claim 6 or 7, wherein the second end (72.2) is disk-shaped.

9. Actuator according to any one of the preceding claims 4 to 8, wherein measured values ​​of the measuring signal of the output force measuring device occupy a range of values ​​with a maximum value and a minimum value, wherein a measured value of the measuring signal is obtained in the force-free state of the actuator. PC 250911 C 24 / 27 June 12, 2025. The output assumes a value which is less than 30%, and in particular less than 25%, and preferably less than 20% of the difference between the maximum value and the minimum value from a mean value of the value range.

10. Actuator according to one of the preceding claims, wherein the spring device (60) comprises at least one first spring element (60.1) and at least one second spring element (60.2), wherein the at least one first spring element is configured to exert a force against a deflection of the output (40) from the rest position in a first direction, and wherein the at least one second spring element is configured to exert a force against a deflection of the resiliently mounted device (61) from the rest position in a second direction opposite to the first direction.

11. Actuator according to claim 10, wherein the at least one first spring element (60.1) and the at least one second spring element (60.2) are configured to exert a force against a deflection of the resiliently mounted device (61) from the rest position in a second direction opposite to the first direction.2) encompass the output, wherein a cross-sectional plane of the first spring element and a cross-sectional plane of the second spring element are separated by a distance of less than 30%, and in particular less than 25%, and preferably less than 20% of a diameter of the first spring element or the second spring element.

12. Actuator according to claim 11, wherein the output shaft (41) is designed as a threaded spindle, wherein the threaded spindle is rotationally fixed. PC 250911 C 25 / 27 12 June 2025 wherein the output has a spindle nut (43), wherein the electric motor (20) is configured to drive the spindle nut rotationally by means of the gearbox and thereby move the threaded spindle axially, wherein the output is resiliently mounted in the actuator housing in an axial direction of the threaded spindle by means of the spring device (60).

13. Actuator according to claim 12, wherein the spindle nut (43) is radially mounted by means of a rolling bearing (80), which rolling bearing is arranged at least partially in a cylindrical recess (11.1) of the actuator housing wall, wherein the cylindrical recess provides a stop (11.11) for the rolling bearing against movement in the direction of a side of the cylindrical recess facing away from the actuator housing, wherein the rolling bearing, when driven (40) in rest position, touches the stop and / or is preloaded against the stop, wherein the at least one first spring element (60.1) and the at least one second spring element (60.2) acting against the rolling bearing on a side of the rolling bearing facing the actuator housing.

14. Actuator according to claim 13, wherein the actuator has a spring plate (90) fixed in the actuator housing with a central opening (91) through which opening the spindle nut (43) is guided. PC 250911 C 26 / 27 June 12, 2025, wherein the spindle nut has a radial projection (43.1), in particular a collar, on a side of the spring plate facing away from the actuator housing, which is configured to act directly or indirectly as a stop against the spring plate, wherein the spring plate is designed as one of the at least one first spring element (60.1).

15. Actuator according to one of claims 13 or 14, wherein the spring plate (90) is arranged outside the cylindrical recess (11.1), wherein the radial projection (43.1) acts against the spring plate via the rolling bearing (80).

16. Actuator according to claim 14 or 15, wherein a first of the gear elements of the transmission (50) is rotationally fixed to the spindle nut (43), wherein the spring device (60) has at least one disc spring, which encompasses at least one disc spring the spindle nut and serves as at least one of the at least one second spring element (60).2) is designed in such a way that the at least one disc spring is arranged and clamped between the first gear element and the rolling bearing. / Summary.

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