Actuating drive

Abstract

To provide an actuating drive that has favorable characteristics and / or a compact design in terms of placing a magnetic field sensor on a rotary axle of an output gear.SOLUTION: An actuating drive includes a housing, which comprises a housing trough and a housing cover, an electric motor arranged in the housing, a gear unit arranged in the housing that has an output gear, and a position detection unit arranged in the housing for detecting a rotational angle position of the output gear, the position detection unit which comprises a magnet arranged on a rotary axle of the output gear, and a magnetic field sensor unit having a magnetic field sensor designed to detect a magnetic field of the magnet. It is proposed that the housing trough of the housing has a receiving region in which the magnetic field sensor unit is arranged such that the rotary axle of the output gear extends through the magnetic field sensor of the magnetic field sensor unit.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to an actuation drive according to the preamble of claim 1 .

[0002] German Patent Application Publication No. 10 2020 108 860 A1 already discloses an actuation drive having a housing with a housing receptacle and a housing cover. The actuation drive housing includes an electric motor, a spur gear with an output gear, and a position detection unit for detecting the rotational angular position of the output gear. The position detection unit includes a magnet arranged on the rotation axis of the output gear and a magnetic field sensor configured to detect the magnetic field of the magnet. The magnetic field sensor of the position detection unit is arranged on a rigid circuit board together with the actuation drive control electronics. To arrange the magnetic field sensor on the rotation axis of the output gear, the circuit board has a complex shape. In addition, arranging the magnetic field sensor on a single rigid circuit board makes it difficult to accurately arrange the magnetic field sensor on the rotation axis of the output gear.

[0003] A corresponding actuation drive is already known from DE 10 2020 120 241 A1.

[0004] The object of the present invention is to provide an actuation drive which has advantageous properties, in particular with regard to the arrangement of the magnetic field sensor on the rotation axis of the output gear, and / or has a compact design. This object is achieved by the features of the characterizing part of claim 1. Advantageous embodiments of the invention are described in the dependent claims. Summary of the Invention

[0005] The invention is based on an actuation drive device having a housing with a housing receptacle and a housing cover, an electric motor arranged in the housing, a gear unit arranged in the housing with an output gear, and a position detection unit arranged in the housing for detecting the rotational angular position of the output gear, the position detection unit comprising a magnet arranged on the rotation axis of the output gear and a magnetic field sensor unit comprising a magnetic field sensor designed to detect the magnetic field of the magnet.

[0006] It is proposed that the housing receiving part of the housing has a receiving area in which the magnetic field sensor unit is arranged so that the rotation axis of the output gear runs through the magnetic field sensor of the magnetic field sensor unit.

[0007] The actuation drive can be used in particular in the automotive sector and / or in automation technology, for example as a flap actuation drive and / or as a valve actuation drive, for example for needle valves.

[0008] The housing of the actuation drive is particularly designed as a two-part housing. The housing includes a housing receptacle and a housing cover, which is fixed to the housing receptacle when the actuation drive is installed and at least adequately seals the trough against dirt and / or liquids. Preferably, both the housing receptacle and the housing cover are made of plastic. In particular, the housing receptacle and the housing cover are injection-molded plastic parts. The housing cover can be connected to the housing receptacle, for example, by gluing, screwing, or preferably laser welding. The electric motor of the actuation drive, which is arranged in the housing receptacle, is particularly designed as a brushless DC motor. The electric motor is particularly designed as an inner rotor motor, which includes a stator and a rotor rotatably arranged in the stator. The rotor has a pinion that transmits the rotor's rotational movement to a gear unit of the actuation drive, which is also arranged in the housing receptacle.

[0009] The gear unit is particularly designed as a multi-stage spur gear, with the output gear forming the final gear stage of the gear unit. The gear unit is preferably designed as a reduction gear. The output gear is mechanically coupled to a pinion of the rotor of the electric motor via other gears of the gear unit, so that the rotational movement of the rotor of the electric motor causes the rotational movement of the output gear via other gears of the gear unit. The output gear is particularly designed to be mechanically coupled to an actuator, for example, to move the actuator as a result of the rotational movement of the output gear. The output gear particularly has an output shaft with a suitable drive transmission. The output shaft can particularly be designed as a hollow shaft, and the drive transmission can particularly be arranged on the inner and / or outer circumference of the output shaft. The housing cover has a circular recess through which the end of the output shaft with the drive transmission is guided out of the housing of the actuation drive device or through which the end of the output shaft with the drive transmission is accessible for connection to the actuator driven by the actuation drive device. The end of the output shaft with the drive transmission is rotatably mounted in the recess of the housing cover, particularly by a plain bearing. In addition, a shaft sealing ring is arranged in a recess in the housing cover and is designed to seal the housing of the actuation drive at the output shaft guided therefrom.

[0010] In addition to the electric motor and the gear unit with the output gear, a position detection unit is also arranged in the housing accommodation and is designed to detect the rotational angular position of the output gear during operation of the actuation drive. The position detection unit includes a magnet arranged on the rotation axis of the output gear. The magnet is arranged on the side of the output gear facing the bottom of the housing accommodation of the actuation drive. In particular, the magnet is fixed to the side of the output gear facing the bottom of the housing accommodation of the actuation drive so as to rotate therewith and is arranged on the rotation axis of the output gear. The rotation axis of the output gear extends through the body of the magnet. The rotation axis extends through the magnet body itself, i.e., does not extend through an opening in the magnet body, as is the case with, for example, a ring-shaped position magnet. In particular, the output gear has a housing for the magnet extending toward the bottom of the housing accommodation. In particular, the magnet is fixed to the housing of the output gear by a form fit, a force fit, and / or an integral connection. The magnet is preferably magnetized in a plane perpendicular to the rotation axis of the output gear. The magnet can be, for example, a two-pole magnet with a north and a south pole, or a multi-pole magnet with three or more poles, such as a four-pole magnet. When the output gear rotates, the magnet moves with the output gear, thereby changing the magnetic field generated by the magnet. This change can be detected by a magnetic field sensor of the position detection unit, which is positioned on the rotation axis of the output gear so that it cannot move relative to the magnet, and from which the rotational angular position of the gear can be determined.

[0011] The magnetic field sensor is specifically designed to detect the strength and / or direction of the magnetic field of a magnet of a position detection unit arranged on the output gear. The magnetic field sensor may be, for example, an inductive magnetic field sensor or a Hall effect sensor, e.g., a one-dimensional, two-dimensional, or three-dimensional Hall effect sensor designed to measure the strength of the magnetic field in one, two, or three spatial directions, respectively. When the output gear moves, the magnetic field changes at the location of the magnetic field sensor. The rotational angular position of the output gear can therefore be determined using the measured magnetic field. To operate the electric motor, the measurements recorded by the magnetic field sensor are transmitted to a control unit, which is also arranged in the housing accommodation and is designed to operate the electric motor based on these measurements or determine the rotational angular position of the output gear based on these measurements to enable accurate operation of the electric motor. The magnetic field sensor unit is immovably arranged on the bottom of the housing accommodation of the actuation drive housing. In particular, the magnetic field sensor unit can be rigidly connected to the bottom of the housing accommodation to at least sufficiently prevent the magnetic field sensor unit from moving. The housing receiving part has a receiving area at its bottom, which is delimited in particular by a peripheral wall, and in which the magnetic field sensor unit is arranged so that the rotation axis of the output gear extends through the magnetic field sensor of the magnetic field sensor unit. The peripheral wall can in particular be designed to at least largely eliminate any axial play of the output gear.

[0012] This configuration makes it possible to provide an actuation drive with advantageous properties, particularly with regard to the arrangement of the magnetic field sensor of the magnetic field sensor unit relative to the magnet of the position detection unit. In particular, by arranging and fixing the magnetic field sensor unit on the bottom of the housing receptacle, the magnetic field sensor is advantageously arranged immovably relative to the magnet arranged on the output gear. The arrangement can also be simplified and / or improved by providing a dedicated receiving area in the housing receptacle for arranging the magnetic field sensor unit.

[0013] It is further proposed that the accommodation area be defined by an annular wall extending from the bottom of the housing accommodation portion toward the interior of the housing and extending concentrically around the rotation axis of the output gear. This makes it possible to achieve an advantageously accurate positioning of the magnetic sensor of the magnetic field sensor unit relative to the magnet of the magnetic field sensor unit arranged on the output gear. The circular wall is particularly integrally formed on the bottom of the housing accommodation portion. Preferably, the circular wall is generated during the manufacturing of the housing accommodation portion. This can be advantageously easily achieved by manufacturing the housing accommodation portion using plastic injection molding. The circular wall extends from the bottom of the housing accommodation portion toward the output gear. The wall circumferentially surrounds the accommodation area, resulting in a circular base surface for the accommodation area. Because the wall extends concentrically around the rotation axis of the output gear, the rotation axis extends vertically through the center of the accommodation area. When installed, the magnetic field sensor unit is positioned in the accommodation area such that the magnetic field sensor of the magnetic field sensor unit is located at the center of the accommodation area, and therefore the rotation axis of the output gear passes through the magnetic field sensor. In particular, additional alignment elements, such as pins, can be arranged in the receiving area, making it easier to accurately position the magnetic field sensor unit. The circular wall of the receiving area can also be used to mount the output gear. For this purpose, the output gear protrudes into the receiving area surrounded by the circular wall, and the circular wall forms a sliding bearing for the output gear.

[0014] It is also proposed that the magnetic field sensor unit comprises a circular rigid circuit board, the magnetic field sensor being arranged at its center. The circular rigid circuit board advantageously allows for simple, particularly fully automated, installation of the magnetic field sensor. Additionally, the circular rigid circuit board advantageously allows for accurate placement of the magnetic field sensor unit in the receiving area of ​​the housing receiving part. The circular rigid circuit board is preferably made of FR4 material. The magnetic field sensor is particularly arranged at the center of the circular circuit board. In particular, the circuit board can have at least two circular through-holes. The through-holes are particularly designed to interact with an equal number of alignment elements in the receiving area of ​​the housing receiving part. At least two cylindrical pins can be arranged in the receiving area of ​​the housing receiving part as alignment elements, and are designed to be inserted into the circular through-holes of the circular rigid circuit board when the circular rigid circuit board is inserted into the receiving area of ​​the housing receiving part. The interaction between the at least two cylindrical pins in the receiving area of ​​the housing receiving portion and the at least two through-holes in the circular rigid circuit board of the magnetic field sensor unit advantageously allows for precise positioning of the magnetic field sensor unit in the receiving area of ​​the housing receiving portion, and thus for precise positioning of the magnetic field sensor of the magnetic field sensor unit with respect to the rotation axis of the output gear. It is also conceivable that the outer periphery of the circuit board of the magnetic field sensor unit abuts against the inner periphery of the wall of the receiving area when the magnetic field sensor unit is installed, so that the circular rigid circuit board of the magnetic field sensor unit can also advantageously be precisely oriented in the receiving area of ​​the housing receiving portion. Preferably, the circular rigid circuit board of the magnetic field sensor unit is fixed in the receiving area of ​​the housing receiving portion by at least one heat-staking connection on the bottom of the housing receiving portion. This advantageously allows for reliable and / or simple fixing of the circular rigid circuit board of the magnetic field sensor unit in the receiving area of ​​the housing receiving portion.In particular, this fixing can be effected via at least two alignment elements in the receiving area of ​​the housing receiving part, which alignment elements are designed as cylindrical pins and pass through at least two corresponding through-recesses in the circular rigid circuit board of the magnetic field sensor unit arranged in the receiving area of ​​the housing receiving part, for which the free ends of the cylindrical pins protruding from the through-recesses in the circular rigid circuit board of the magnetic field sensor unit are thermally deformed in such a way that mushroom heads are formed which connect and fix the circular rigid circuit board of the magnetic field unit at least in the axial direction.

[0015] It is further proposed that the actuation drive device comprises a control unit having a rigid circuit board arranged in the housing accommodation above the electric motor, as viewed from the bottom of the housing accommodation. The control unit particularly comprises control electronics for actuating the electric motor, in particular based on measurement values ​​recorded by the magnetic field sensor unit and transmitted to the control unit. The control unit comprises a rigid circuit board on which the control electronics are arranged, in particular arranged directly on the electric motor, so that the stator coil of the electric motor can be directly connected to the rigid circuit board of the control unit. To transmit the measurement values ​​from the magnetic field sensor unit to the control unit, the control unit is connected to the magnetic field sensor unit via multiple electrical wires. Preferably, the actuation drive device comprises a flexible circuit board that electrically connects the rigid circuit board of the control unit to the circular rigid circuit board of the magnetic field sensor unit. Advantageously, this allows the electrical connection between the control unit and the magnetic field sensor unit to be flexible with minimal space requirements. In particular, height differences between the rigid circuit board of the control unit and the circular rigid circuit board of the magnetic field sensor unit can also be advantageously easily overcome. To overcome the height difference, the flexible circuit board is preferably guided from the rigid circuit board of the control unit to the bottom of the housing receptacle and then along the bottom of the housing receptacle to the circular rigid circuit board of the magnetic field sensor unit. The flexible circuit board is in particular made of a carrier film, for example a polyimide film, to which a plurality of conductor tracks, in particular copper conductor tracks, are applied. The conductor tracks of the flexible circuit board are electrically conductively connected to both the rigid circuit board of the control unit and the circular rigid circuit board of the magnetic field sensor unit.

[0016] In a particularly preferred embodiment of the present invention, the rigid circuit board of the control unit, the circular rigid circuit board of the magnetic field sensor unit, and the flexible circuit board are integrally formed as a rigid-flexible circuit board. A rigid-flexible circuit board is a hybrid consisting of a combination of at least one conventional rigid board circuit board and at least one flexible circuit board. In particular, a rigid-flexible circuit board can be composed of multiple rigid sections seamlessly connected to each other by a flexible circuit board. Thus, the rigid-flexible circuit board forms a mechanical and electrical unit. By using a rigid-flexible circuit board, advantageous polarity and / or contact reliability can be achieved with regard to electrical conductivity between the control unit and the magnetic field sensor unit. Additionally, plug and / or line components can be eliminated.

[0017] Additionally, it is proposed that the flexible circuit board be fixed in the region between the rigid circuit board of the control unit and the circular rigid circuit board of the magnetic field sensor unit by at least one heat-staking connection on the bottom of the housing receptacle. This advantageously fixes the flexible circuit board in place within the housing receptacle. In particular, at least one tab is formed on the carrier film of the flexible circuit board, which has a through-hole. Preferably, multiple tabs are formed on the carrier film of the flexible circuit board, each having a through-hole. In particular, cylindrical pins are formed on the bottom of the housing receptacle, the number of which corresponds to the number of tabs on the carrier film of the flexible circuit board. These pins are designed to extend through the through-holes of the tabs of the flexible circuit board arranged on the bottom of the housing receptacle. Thermal deformation of the free ends of the cylindrical pins forms mushroom heads, which tightly fix the flexible circuit board to the bottom of the housing receptacle, at least in the axial direction.

[0018] The output gear can be slidably and rotatably mounted directly by a circular wall that limits the accommodation area of ​​the housing accommodation. However, it is alternatively conceivable that the actuation drive has an annular plain bearing element that supports the output gear for rotation about the rotation axis, and the output gear is arranged in the accommodation area of ​​the housing accommodation. The plain bearing element can consist, in particular, of a plastic material with good sliding properties. The plain bearing element in particular has an outer diameter that substantially corresponds to the inner diameter of the circular wall of the accommodation area of ​​the housing accommodation, so that, in the assembled state, its outer periphery rests at least substantially without play on the inner periphery of the circular wall of the accommodation area of ​​the housing accommodation. In particular, the circular wall of the accommodation area of ​​the housing accommodation can have a step on which the plain bearing element rests in the assembled state, so that the plain bearing element is axially spaced from the bottom of the housing accommodation and the circular rigid circuit board of the magnetic field sensor unit is arranged on the bottom of the housing accommodation in the accommodation area.

[0019] The actuation drive according to the present invention is not limited to the applications and embodiments described above, and in particular may have a different number of individual elements, components and units than those described herein in order to perform the functions described herein. [Brief explanation of the drawings]

[0020] Further advantages can be found in the following description of the drawings, which illustrate one embodiment of the present invention. The drawings, this specification, and the claims contain a number of feature combinations. Those skilled in the art will also conveniently consider those features individually and combine them into further meaningful combinations.

[0021] The drawings are as follows: [Figure 1] FIG. [Figure 2] FIG. 2 is a cross-sectional view of the actuation drive of FIG. [Figure 3]2 is a perspective plan view of the actuation drive of FIG. 1 shown without the housing cover and gear unit. [Figure 4] FIG. 2 is a cross-sectional view of the output gear of the differential drive device of FIG. DETAILED DESCRIPTION OF THE INVENTION

[0022] Figure 1 shows an exploded view of an actuation drive 10. Figure 2 shows the actuation drive 10 in a cross-sectional view. The actuation drive 10 has a two-part housing 12 with a housing receptacle 14 and a housing cover 16. The housing receptacle 14 of the housing 12 and the housing cover 16 are preferably designed as injection-molded plastic parts. In the assembled state of the actuation drive 10, the housing receptacle 14 is closed by the housing cover 16. In particular, the housing cover 12 can be glued or welded to the housing receptacle 14.

[0023] The actuation drive 10 further comprises an electric motor 18 arranged in the housing receptacle 14 of the housing 12. The electric motor 18 is preferably designed as a brushless DC motor. The actuation drive 10 has a control unit 44 with a rigid circuit board 46. In particular, the control electronics for operating the electric motor 18 are arranged on the rigid circuit board 46 of the control unit 44. The rigid circuit board 46 of the control unit is arranged directly on the electric motor 18. When viewed from the bottom 38 of the housing receptacle 14 of the housing 12, the rigid circuit board 46 of the control unit 44 is arranged above the electric motor 18.

[0024] The electric motor 18 comprises a stator 56 and a rotor 58 rotatably mounted within the stator 56. The rotor 58 is rotatably mounted on a fixed shaft 60 and rotates about this shaft 60 during operation of the electric motor 18. The rotor 58 has a pinion 62 designed to transmit the rotational movement of the rotor 58 to a gear unit 20 of the actuation drive 10. The gear unit 20 of the actuation drive 10 as well as the electric motor 18 are arranged in the housing receptacle 14 of the housing 12. The gear unit 20 is designed as a multi-stage spur gear having multiple gears, and the output gear 22 forms the last gear of the gear unit 20. The output gear 22 is connected to the pinion 62 of the rotor 58 of the electric motor 18 via other gears of the gear unit, so that the rotational movement of the rotor 58 is transmitted to the output gear 22 via a gear arranged between the pinion 62 and the output gear 22.

[0025] The output gear 22 is designed to be mechanically coupled to an actuator (not shown here), for example, to convert the rotational movement of the output gear 22 into the movement of the actuator. The output gear 22 comprises an output shaft 64 designed as a hollow shaft, which has a drive transmission part 72 for mechanically coupling to the driven actuator. The housing cover 16 has a circular recess 74 in which the output shaft 64 of the output gear 22 is mounted by means of a plain bearing 68 so as to rotate about the rotation axis 28. A shaft seal ring 70 is also arranged in the recess 74 of the housing cover 16 and is designed to seal the housing 12 of the actuation drive device 10 at the output shaft 64 of the output gear 22 that is guided therefrom.

[0026] To detect the rotational angular position of the output gear 22, the actuation drive 10 includes a position detection unit 24, which is also arranged in the housing recess 14 of the housing 12. The position detection unit 24 has a magnet 26 arranged on the rotation axis 28 of the output gear 22. The magnet 26 is arranged on the side of the output gear 22 facing toward the bottom 38 of the housing recess 14 of the housing 12. To arrange the magnet 26 on the rotation axis 28 of the output gear 22, the output gear 22 has a receiving portion 76 for the magnet 26, which extends toward the bottom 38 of the housing recess 14 of the housing 12. The magnet 26 is arranged in the receiving portion 76 of the output gear 22 to rotate therewith. The magnet 26 can be fixed in the receiving portion 76 of the output gear 22, in particular, by form-fitting, press-fitting, and / or integral bonding. For example, the magnet 26 can be press-fitted and / or glued into the receiving portion 76. However, it is alternatively conceivable that the magnet 26 may be fixed to the housing 76 by deformation, particularly thermal deformation, of a wall 78 of the housing 76, as shown in Fig. 4. The magnet 26 is arranged in the housing 76 so that the rotation axis 28 of the output gear 22 extends through the body of the magnet 26. The magnet 26 is preferably magnetized in a plane perpendicular to the rotation axis 28 of the output gear 22. The magnet 26 may be, for example, a two-pole magnet having a north pole and a south pole, or a multi-pole magnet having three or more poles, for example a four-pole magnet.

[0027] In addition to the magnet 26, the position detection unit 24 includes a magnetic field sensor unit 30 having a magnetic field sensor 32. The magnetic field sensor 32 of the magnetic field sensor unit 30 is configured to detect the magnetic field of the magnet 26. The housing accommodation portion 14 of the housing 12 has an accommodation region 34 in which the magnetic field sensor unit 30 is disposed such that the rotation axis 28 of the output gear 22 extends through the magnetic field sensor 32 of the magnetic field sensor unit 30. When the output gear 22 rotates, the magnet 26 also rotates relative to the magnetic field sensor 32 of the magnetic field sensor unit 30. This changes the magnetic field at the location of the magnetic field sensor 32 of the magnetic field sensor unit 30. The rotational angular position of the output gear 22 can be determined using the measured magnetic field.

[0028] An accommodation area 34 for accommodating the magnetic field sensor unit 30 is defined by an annular wall 36. The wall of the accommodation area 34 extends from a bottom 38 of the housing accommodation portion 14 of the housing 12 into the interior of the housing 12, and thus toward the output gear 22. The wall 36 of the accommodation area 34 extends concentrically around the rotation axis 28 of the output gear 22. Thus, the accommodation area 34 has a circular base surface, and the rotation axis 28 of the output gear 22 extends vertically through the center of the circular base surface of the accommodation area 34 (see FIG. 3 ).

[0029] The magnetic field sensor unit 30 has a circular rigid circuit board 40 with a magnetic field sensor 32 disposed at its center. The circular rigid circuit board 40 of the magnetic field sensor unit 30 is disposed within the accommodating region 34 such that the magnetic field sensor 32 is located at the center of the circular base surface of the accommodating region 34. The magnetic field sensor 32 of the magnetic field sensor unit 30 is disposed such that the rotation axis 28 of the output gear 22 extends through the magnetic field sensor 32 of the magnetic field sensor unit 30. The circular rigid circuit board 40 of the magnetic field sensor unit 30 is fixed within the accommodating region 34 of the housing accommodating portion 14 of the housing 12 by two heat-staking connections 42 on the bottom 38 of the housing accommodating portion 14. To create the heat-staking connections 42, the circular rigid circuit board 40 of the magnetic field sensor unit 30 has two through-holes 90. Two cylindrical pins (not shown here) are formed on the bottom 38 of the housing accommodating portion 14 within the accommodating region 34 and are designed to extend through through-holes 90 in the circular rigid circuit board 40 of the magnetic field sensor unit 30 disposed on the bottom 38 of the housing accommodating portion 14. Thermal deformation of the free ends of the cylindrical pins forms mushroom heads 92, thereby fixing the circular rigid circuit board 40 of the magnetic field sensor unit 30 within the accommodating region 34 on the bottom 38 of the housing accommodating portion 14 (see FIG. 3 ).

[0030] To connect the circular rigid circuit board 40 of the magnetic field sensor unit 30 to the rigid circuit board 46 of the control unit 44, the actuation drive 10 has a flexible circuit board 48. The flexible circuit board 48 consists, in particular, of a carrier film to which a plurality of conductor tracks are applied. To overcome the height difference between the rigid circuit board 46 of the control unit 44 and the circular rigid circuit board 40 of the magnetic field sensor unit 30, the flexible circuit board 48 is guided from the rigid circuit board 46 of the control unit to the bottom 38 of the housing receptacle 14 and then along the bottom 38 of the housing receptacle 14 of the housing 12 to the circular rigid circuit board 40 of the magnetic field sensor unit 30 (see FIG. 3). Here, the flexible circuit board 48 is deflected at least twice by an angle of substantially 90°. To guide the flexible circuit board 48 along the bottom 38 of the housing receptacle 14 of the housing 12 into the receiving area 34 for the magnetic field sensor unit 30, the circular wall 36 of the receiving area 34 has a recess 80 facing toward the electric motor 18, through which the flexible circuit board 48 is guided. Preferably, the rigid circuit board 46 of the control unit 44, the circular rigid circuit board 40 of the magnetic field sensor unit 30, and the flexible circuit board 48 are integrally formed as a rigid-flex circuit board 50. In this case, it is possible to avoid the use of additional plug connectors, in particular for electrically connecting the flexible circuit board 48 to the rigid circuit board 46 of the control unit 44 and the circular rigid circuit board 40 of the magnetic field sensor unit 30. In the region between the rigid circuit board 46 of the control unit 44 and the circular rigid circuit board 40 of the magnetic field sensor unit 30, the flexible circuit board 48 is fixed to the bottom 38 of the housing receptacle 14 by two heat-staking connections 52. To create the heat staked connection 52, the flexible circuit board 48 has two tabs 84, with a through recess 86 formed in each tab 84. Two cylindrical pins (not shown here) are formed on the bottom 38 of the housing accommodation 14 and are designed to extend through the through recesses 86 in the tabs 84 of the flexible circuit board 48 disposed on the bottom 38 of the housing accommodation 14.Thermal deformation of the free end of the cylindrical pin forms a mushroom head 88, thereby securing the flexible circuit board 48 to the bottom 38 of the housing receiving portion 14 (see FIG. 3).

[0031] The actuation drive 10 includes an annular plain bearing element 54 arranged in the receiving area 34 of the housing accommodation 14 to support the output gear 22 so that it can rotate about the rotation axis 28 on the side opposite the output shaft 64. The plain bearing element 54 is preferably made of a plastic material with good sliding properties. The outer diameter of the plain bearing element 54 at least substantially corresponds to the inner diameter of the circular wall 36 of the receiving area 34 of the housing accommodation 14. In the assembled state, the outer periphery of the plain bearing element 54 abuts against the inner periphery of the circular wall of the receiving area 34 of the housing accommodation 14. The circular wall 36 of the receiving area 34 of the housing accommodation 14 has a step 82 on which the plain bearing element 54 is positioned in the assembled state, so that the plain bearing element 54 is axially spaced from the bottom 38 of the housing accommodation 14. This allows the flexible circuit board 48 to be guided into the receiving area 34 of the housing accommodation 14 below the plain bearing element 54. [Explanation of symbols]

[0032] 10. Actuating drive unit 12 Housing 14 Housing receiving section 16 Housing cover 18 Electric Motor 20 Gear unit 22 Output gear 24 Position detection unit 26 Magnet 28 Rotation axis 30 Magnetic field sensor unit 32 Magnetic field sensor 34 Containment Area 36 Containment Area Wall 38 Bottom 40 circular circuit boards 42 Heat crimped connection 44 Control Unit 46 Circuit Board Control Unit 48 Flexible Circuit Board 50 Rigid-Flexible Circuit Boards 52 Heat crimped connection 54 Plain bearing element 56 Stator 58 Rotor 60 axes 62 Pinion 64 Output shaft 68 Plain bearing 70 Shaft seal ring 72 Drive transmission unit 74 Cover recess 76 Storage unit 78 Containment Wall 80 recess 82 steps 84 tabs 86 Through recess 88 Mushroom Head 90 Through recess 92 Mushroom Head

Claims

1. 1. An actuation drive comprising: a housing having a housing receptacle and a housing cover; an electric motor arranged in the housing; a gear unit arranged in the housing having an output gear; and a position detection unit arranged in the housing for detecting the rotational angular position of the output gear, the position detection unit comprising a magnet arranged on the rotation axis of the output gear and a magnetic field sensor unit having a magnetic field sensor designed to detect the magnetic field of the magnet, wherein the housing receptacle of the housing has an accommodation area, and the magnetic field sensor unit is arranged in the accommodation area such that the rotation axis of the output gear extends through the magnetic field sensor of the magnetic field sensor unit.

2. 2. The actuation drive device according to claim 1, wherein the accommodation area is defined by an annular wall extending from a bottom of the housing accommodation portion toward the interior of the housing and extending concentrically around the rotation axis of the output gear.

3. 2. The actuation drive device according to claim 1, wherein the magnetic field sensor unit comprises a circular rigid circuit board, and the magnetic field sensor is disposed at the center of the circular rigid circuit board.

4. 4. The actuation drive device according to claim 3, characterized in that the circular rigid circuit board of the magnetic field sensor unit is fixed within the housing accommodation area by at least one heat staking connection on the bottom of the housing accommodation.

5. 2. The actuation drive device according to claim 1, further comprising a control unit having a rigid circuit board arranged in the housing receptacle above the electric motor when viewed from the bottom of the housing receptacle.

6. 4. The actuation drive device of claim 3, further comprising a flexible circuit board electrically connecting the rigid circuit board of the control unit to the circular rigid circuit board of the magnetic field sensor unit.

7. The actuation drive device of claim 6, characterized in that the flexible circuit board is guided from the rigid circuit board of the control unit to the bottom of the housing accommodating portion and then guided along the bottom of the housing accommodating portion to the circular rigid circuit board of the magnetic field sensor unit.

8. 7. The actuation drive device according to claim 6, wherein the rigid circuit board of the control unit, the circular rigid circuit board of the magnetic field sensor unit, and the flexible circuit board are integrally formed as a rigid-flexible circuit board.

9. 8. The actuation drive device of claim 7, wherein the flexible circuit board is fixed in the area between the rigid circuit board of the control unit and the circular rigid circuit board of the magnetic field sensor unit by at least one heat staking connection on the bottom of the housing accommodating portion.

10. 2. The actuation drive device according to claim 1, characterized in that an annular plain bearing element for supporting the output gear so that it can rotate about the rotation axis is arranged in the accommodation area of ​​the housing accommodation part.

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