DE102015205872B4 - Actuator comprising an electronics module with a cover element for better alignment of the sensor and rotor position magnet - Google Patents

Abstract

Actuator (2) for actuating a clutch and/or a transmission of a motor vehicle, with an electronics module (1), with a printed circuit board (4) and a rotor position sensor (5) which is used to detect a rotational position of a rotor (6) of the actuator (2 ) is prepared and fixed on the printed circuit board (4), wherein a cover component (7) defining the distance between the printed circuit board (4) and a sealing interface region (11) of a drive unit (14) containing the rotor (6) is connected to the printed circuit board (4) as a partial assembly of the printed circuit board (4) comprising the cover component (7) before the assembly of the partial assembly is connected to the sealing interface area (11), the electronics module (1) having an electronics housing (3) with a cover (25), the electronics housing (3 ) is an integral part of a drive housing (26) and the drive housing (26) comprises a stator (15) and the rotor (6) of the actuator (2) and the circuit board (4), characterized in that the cover The component (7) has a disc-shaped base section (31) which has on its radial outside a collar section (32) extending away from the printed circuit board (4) in the axial direction, the stator (15) has a stator housing (16) designed as an overmolding and the collar portion (32) of the cover member (7) is secured to the stator receiving housing (16) radially inward of the drive housing (26) by means of a tongue and groove sealing interface (19).

Description

The invention relates to an actuator with an electronics module (also referred to as a sensor module) for use in a motor vehicle, such as a car, truck, bus or agricultural vehicle, with a printed circuit board and a rotor position sensor, which prepares for detecting a rotational position of a rotor of the actuator and mounted on the circuit board.

Actuators that are used during operation as transmission or clutch actuators are already known from the prior art. It is also well known here that, if they are electrically driven, they can have an electronic module. In this context, the applicant is aware of internal prior art which, however, has not yet been published on the filing date of the present application. This prior art relates to the PCT international application WO 2015/048956 A2 with the filing date September 9, 2014. This discloses an actuator for a motor vehicle which has a housing and an electromagnetic drive device which in turn has a stator and a rotor which can be rotated relative to this stator. The rotor is connected to a triggering element via a converter unit. The converter unit converts the rotational movement of the rotor into a translatory movement of the triggering element. Furthermore, there is an electronic control unit which is electrically connected to the drive device and controls the drive device. At least on the side facing the control unit, the drive device has an overmolding made of an electrically insulating material. Another post-released actor is in the DE 10 2014 218 034 A1 described.

Generic actuators are also from the DE 10 2014 208 088 A1 , DE 10 2011 014 932 A1 and DE 10 2005 023 202 A1 known.

Relevant electric motors are also from the DE 10 2011 111 667 A1 , DE 102 07 310 A1 known.

Furthermore, from the DE 35 19 941 C1 a seat shell is known, which consists of individual seats and whose closure takes place via a cover, which is supported on the longitudinal edge of the seat shell via tongue and groove connections.

Even if this known solution enables a particularly compact configuration of the electronics module and the actuator, which usually also means that a large number of sealing points are implemented between a motor area and an electronics area of the actuator, it is often a disadvantage here that the axial distance adjustment of the rotor position magnet relative to the rotor position sensor can be difficult. In particular, this axial setting is relatively difficult to reliably determine because of the tolerance chains that form. Since there is usually no direct access to the front face of the rotor position magnet, it is often not possible to determine with certainty when assembling the printed circuit board (also referred to as a PCB (printed circuit board) or electronic PCB) in which relative position the rotor position magnet is the rotor position sensor. However, the accurate adjustment of the axial distance between the rotor position magnet and the rotor position sensor is relatively important for the accurate measurement of the position of the rotor / the twisted position of the rotor. Especially with the commonly used magnetoresistive sensors (designed as “giant magnetoresistance” (GMR / GMR sensor) or integrated “giant magnetoresistance” (iGMR / iGMR sensor)) it is important to meet the exact requirement of the magnetic circuit, that the relative axial position, i.e. the axial distance between the rotor position sensor and the rotor position magnet, is reliably set to a specific value.

This is particularly related to the flux density of the rotor position magnet, which decreases in a strongly non-linear manner with increasing distance away from the end face of the magnet. The angular error calculated by the tangential and radial components of the magnetic flux density then increases. Both parameters - flux density level and angle error - are particularly important for the accuracy of the angle sensor output signal. Even a very short distance between the rotor position magnet and the rotor position sensor can lead to permanent errors, in particular to an error increase in the angle sensor output signal, which can even cause a sensor failure above a certain flux density level. This effect is intensified even more when ambient temperatures are high. The small distances between the magnet and the wall also lead to critical tolerance situations and possibly even to a sliding contact between the magnet and the wall under certain load cases.

It is therefore the object of the present invention to eliminate the disadvantages known from the prior art, with the intention in particular to reduce the susceptibility of the rotor position sensor to measurement errors.

In the present case, this object of the invention is achieved by an actuator of the generic type having the features of claim 1 .

It is provided according to the invention that a cover component (precisely) determining/determining/defining the distance between the printed circuit board and a sealing interface region of a drive unit containing the rotor is connected to the printed circuit board. This introduces an interruption in the sealing path between the electronics installation space and the stator installation space (stator receptacle). This provides an accurate setting of the distance between the circuit board and the RL magnet by means of an additional sealing interface in the stator overmold / stator housing and the cover component, which is connected to the circuit board.

This creates a defined space within which the rotor position sensor is securely held at a specific distance relative to the rotor and its rotor position magnet. An interruption in the sealing path of the electronics module is created by the cover component. This interruption makes it possible to press the rotor position (RL) magnet very precisely in the axial direction in production, with reference to the base surfaces, which are also used as contact surfaces for the printed circuit board (PCB). The interruption/subdivision into cover part (cover component) and sealing interface in the stator overmoulding is implemented by additional dispensing of liquid seal (preferably adhesive) into the sealing gap (tongue/groove pairing) between cover part and sealing interface in the stator overmoulding. Thus, the tolerances in the axial direction, which are critical for the accuracy of the sensor, are compensated for in the sealing path between the cover part (cover component) and the sealing interface (the sealing interface area) in the stator overmoulding, and by calibrating/pressing/mounting axially to measure from the rotor position magnet (RL Magnet) creates a high accuracy of the axial distance between sensor and magnet.

Further advantageous embodiments are claimed in the dependent claims and explained in more detail below.

It is to be regarded as an advantage if the cover component is attached (to the printed circuit board) and designed in such a way that the rotor position sensor is arranged within a receiving space formed between the printed circuit board and the cover component. In particular, this means that the distance between the circuit board in the area of the rotor position sensor relative to the face of the RL magnet is fixed and kept very precisely by the fact that the RL magnet and PCB are mounted on the same base surfaces (plant in the carrier housing for PCB) in the carrier housing of the actuator.

Furthermore, it is advantageous if the cover component forms an area as a sealing interface (tongue or groove profile) on a side facing away from the printed circuit board, which is prepared for sealing at the sealing interface area in the stator encapsulation (the stator housing). By gluing / dispensing liquid sealant in the sealing interface, a direct and robust attachment against vibrations of the cover component during operation in a defined axial position is implemented.

If the cover component is attached to the printed circuit board in a form-fitting, non-positive and/or material manner by means of at least one holding element, a particularly stable attachment of the cover component to the printed circuit board is implemented.

In this context, it is also advantageous if the at least one holding element is/are designed as a pin/or multiple pins and this/this is/are fastened in a receiving opening/or multiple receiving openings in the printed circuit board. This is because the holding element can thus be designed particularly cost-effectively, in particular if the cover element (cover component) is produced as a dielectric (insulation part) from plastic by injection molding.

If the pin is also held/fastened via a press fit in the receiving opening, avoiding relative displacement between the cover component and the printed circuit board, a particularly simple and cost-effective attachment of the cover component in the radial and axial direction is implemented.

Instead of the at least one retaining element designed as a pin or in addition to the at least one retaining element designed as a pin, it is also possible to design the at least one or at least one additional retaining element as a clip, i.e. as a snap-in protrusion that can be positively engaged. The clip is then more preferably snapped directly into a receiving opening/recess in the printed circuit board. This makes it even easier to assemble the cover component quickly.

Two holding elements are preferably provided on the cover component, since the attachment to the printed circuit board is thus implemented particularly efficiently.

The cover component is further preferably designed as a plastic component produced by injection molding, as a result of which the holding elements are connected directly to the cover component during the primary molding process/casting process.

Furthermore, it is advantageous if the cover component has at least one stop surface which bears flat against the printed circuit board. As a result, the cover component is supported transversely to a plane of extension within which the printed circuit board extends. The cover component is then complete, defined and attached to the printed circuit board without being displaced.

The invention comprises an actuator itself, which is designed to actuate a clutch and/or a transmission of a motor vehicle, with an electronics module according to at least one of the embodiments described above, and with a drive unit comprising a stator, which is accommodated in a stator receiving housing, and the Rotor which is arranged radially inside the stator and can be rotated relative to the stator, with a rotor position magnet being attached to an end region of the rotor facing the printed circuit board or to a spindle carrier of the rotor, which magnet is arranged adjacent to the rotor position sensor in the axial direction of the rotor is that it can be detected by this rotor position sensor (in its rotational position), and a distance between the rotor position sensor and the rotor position magnet is fixed/defined by the cover component. In the previous assembly process / during the previous calibration, it is particularly important that the RL magnet is precisely calibrated / assembled / pressed in with reference to the contact surfaces of the printed circuit board (PCB) on the carrier housing of the actuator. The axial position of the RL magnet is thus fixed, which is implemented by dividing the sealing interface between the electric motor area and the electronics area in the drive module of the actuator with the cover component. As a result, the actuator is configured particularly efficiently overall.

The cover component is expediently attached to the printed circuit board in one such way that an axial distance (gap distance) between the rotor position sensor and the rotor position magnet, viewed in relation to the longitudinal axis of the rotor, is adjusted by the calibration/installation of the RL magnet to position in relation to the support surfaces for PCB is intended / fixed in the carrier housing. The "spacer" elements (first and second stop surfaces) on the cover part ensure an air gap between the cover part and the sensor component.

The cover component is then (preferably by means of the at least one holding element) fastened to the printed circuit board in a form-fitting, non-positive and/or cohesive manner, and is fastened to the sealing interface area with the stator by means of a liquid seal (cohesively). the circuit board is implemented.

According to the invention, the stator receiving housing is designed as an encapsulation (also referred to as a stator encapsulation). The stator housing is then preferably made of plastic and sprayed on around the stator immediately after it has been produced, the stator housing being dimensionally stable even after the material/plastic material has solidified. As a result, the stator receiving housing can be produced in a particularly cost-effective manner.

According to the invention, the cover component is fastened to the stator housing by means of a tongue and groove sealing interface and advantageously with an adhesive connection. As a result, a particularly defined, durable attachment of the cover component and the printed circuit board to the stator housing is implemented during operation of the actuator.

The adhesive bond (i.e., an adhesive substance that adheres to both the stator housing and the cover member) is preferably located in a groove of the tongue and groove sealing interface (also referred to as tongue and groove joint), with the tongue geometry representing an adhesive displacement geometry and tolerance wise there is always an adhesive gap between the cover component and the stator encapsulation as a gap filled with adhesive. As a result, the cover component is particularly firmly connected to the drive unit/the stator housing. The adhesive substance providing the adhesive connection is advantageously in the form of a sealing adhesive, i.e. an adhesive that has sufficient adhesion to the two adhesive parts (cover component and stator receiving housing/stator encapsulation) when curing and performs a sealing function. As a result, the stator installation space is effectively sealed to the outside from the area surrounding the cover component within the electronics installation space.

Furthermore, it is advantageous if the cover component forms/has a tongue section of the tongue and groove sealing interface designed as a projection, which is pushed into a groove of the tongue and groove sealing interface, which in turn is formed on the stator receiving housing. This makes it particularly easy to bring the RL magnet to an exact axial position before the PCB is installed. However, it is also advantageous to provide the groove on the cover member, in which case the protrusion/tongue portion would be provided on the stator housing/seal interface area. The variants can be used depending on the application direction of the adhesive (dispensing) and depending on the installation space situation.

If an inner wall of the stator housing, which delimits a groove radially inwards (in relation to the axis of rotation/longitudinal axis of the rotor), extends further in the axial direction (in relation to the axis of rotation/longitudinal axis of the rotor) than an outer wall of the stator, which delimits the groove radially outwards Stator receiving housing, the probability is reduced that an adhesive substance forming the adhesive bond can penetrate into an interior space, ie towards the rotor position magnet, before curing. This prevents certain components from sticking together.

In other words, the invention thus proposes a better axial and true-angle positioning of the rotor position sensor in the electronic module in relation to the rotor position magnet. In the central area, i.e. in the area of the sensor/rotor position sensor, the electronics assembly/electronics module, i.e. in particular the circuit board/printed circuit board, has a separate cover (cover component). This engages in the stator encapsulation via a tongue and groove seal interface. A liquid adhesive is kept in the groove. Preferably, the side of the spring facing the magnet is longer than the outer side so that no excess adhesive/adhesive substance can enter the magnet area of the rotor during assembly of PCB subassembly and corresponding adhesive displacement. In order to obtain a better uniformity of the adhesive gap between the cover component and the stator encapsulation, further pins or positioning elements (retaining elements) can also be provided on the cover component. The electronics module is preferably used in an actuator designed as a hydraulic clutch actuator or mechanical clutch actuator.

The invention will now be explained in more detail below with reference to figures, in which connection various exemplary embodiments are also described.

• 1 eine Längsschnittdarstellung durch ein erfindungsgemäßes Elektronikmodul nach einem vorteilhaften Ausführungsbeispiel in einem an einem Aktor befestigten Zustand, wobei das Elektronikmodul im Bereich seines Deckelbauteils sowie des Rotorlagesensors geschnitten dargestellt ist und besonders gut die Befestigung des Deckelbauteils an einem Statoraufnahmegehäuse des erfindungsgemäßen Aktors mittels einer Klebeverbindung verdeutlicht ist,
• 2 eine isometrische Darstellung des in 1 bereits geschnitten dargestellten Elektronikmoduls in einem am Stator des Aktors befestigten Zustand,
• 3 eine isometrische Detailansicht des in 1 dargestellten Elektronikmoduls in einem am Stator des Aktors befestigten Zustand, wobei insbesondere das Elektronikmodul im Bereich des Deckelbauteils sowie des Rotorlagesensors dargestellt ist,
• 4 eine isometrische Darstellung des in den 1 bis 3 verbauten Stators, wobei besonders gut die Nut als Gegengeometrie der Nut-Feder-Dichtungsschnittstelle eines an dem Deckelbauteil angeordneten Federabschnittes gut zu erkennen ist,
• 5 eine Längsschnittdarstellung des Stators gemäß 4 in isometrischer Ansicht,
• 6 eine isometrische Darstellung eines Teilzusammenbaus der Leiterplatte umfassend das Deckelbauteil,
• 7 eine Schnittdarstellung des Teilzusammenbaus aus 6, wobei besonders gut der Rotorlagesensor, der in einem Aufnahmeraum zwischen der Leiterplatte und dem Deckelbauteil aufgenommen ist, zu erkennen ist,
• 8 eine isometrische Ansicht des in 6 bereits dargestellten Teilzusammenbaus aus Leiterplatte und Deckelbauteil, wobei die Leiterplatte von einer dem Rotorlagesensor abgewandten Seite dargestellt ist,
• 9 eine Detailansicht eines Ausschnittes, dessen Position in 8 mit „IX“ gekennzeichnet ist, wobei in dieser geschnittenen Darstellung die Befestigung des Deckelbauteils an der Leiterplatte erkennbar ist,
• 10 eine isometrische Darstellung eines in den 1 bis 3 sowie 6 bis 9 verwendeten Deckelbauteils, wobei im Wesentlichen eine im Betriebszustand der Leiterplatte abgewandte Seite zu erkennen ist,
• 11 eine Längsschnittdarstellung des Deckelbauteils nach 10, wobei zwei sich in axialer Richtung zur Leiterplatte hin erstreckende Abstützvorsprünge zu erkennen sind, die jeweils eine Abstützfläche ausbilden, die zur Anlage an der Leiterplatte ausgebildet ist, und
• 12 eine isometrische Darstellung des in 10 und 11 bereits dargestellten Deckelbauteils, wobei das Deckelbauteil nun von einer der Leiterplatte im Betrieb zugewandten Seite dargestellt ist und besonders gut die beiden jeweils in eine Aufnahmeöffnung der Leiterplatte einschiebbaren Halteelemente zu erkennen sind.

Show it:

• 1 a longitudinal sectional view through an electronic module according to an advantageous exemplary embodiment in a state attached to an actuator, the electronic module being shown in section in the area of its cover component and the rotor position sensor and the attachment of the cover component to a stator housing of the actuator according to the invention being illustrated particularly well by means of an adhesive connection,
• 2 an isometric representation of the in 1 electronics module already shown in section in a state attached to the stator of the actuator,
• 3 an isometric detail view of the in 1 Electronic module shown in a state attached to the stator of the actuator, with the electronic module being shown in particular in the area of the cover component and the rotor position sensor,
• 4 an isometric view of the in den 1 until 3 installed stator, with the groove being particularly easy to recognize as the counter-geometry of the groove-tongue sealing interface of a tongue section arranged on the cover component,
• 5 according to a longitudinal section view of the stator 4 in isometric view,
• 6 an isometric representation of a partial assembly of the printed circuit board comprising the cover component,
• 7 a sectional view of the partial assembly 6 , whereby the rotor position sensor, which is accommodated in a receiving space between the printed circuit board and the cover component, can be seen particularly well,
• 8th an isometric view of the in 6 already shown partial assembly of circuit board and cover component, the circuit board being shown from a side facing away from the rotor position sensor,
• 9 a detailed view of a section whose position in 8th is marked with "IX", whereby the attachment of the cover component to the circuit board can be seen in this sectional view,
• 10 an isometric representation of one in the 1 until 3 and 6 to 9 used cover component, wherein essentially a side facing away from the printed circuit board in the operating state can be seen,
• 11 a longitudinal sectional view of the cover component 10 , wherein two supporting projections can be seen which extend in the axial direction towards the printed circuit board and which each form a supporting surface which is designed to rest on the printed circuit board, and
• 12 an isometric representation of the in 10 and 11 cover component already shown, the cover component now being shown from a side facing the printed circuit board during operation and the two retaining elements which can each be pushed into a receiving opening in the printed circuit board can be seen particularly well.

The figures are only of a schematic nature and serve exclusively for understanding the invention. The same elements are provided with the same reference numbers.

In the 1 until 3 the electronic module 1 according to the invention can be seen particularly well in conjunction with an actuator 2 . The electronics module 1 is prepared for an actuator 2 that can be used/used/used/used in a motor vehicle. In the 1 until 3 this electronic module 1 is already installed in such an actuator 2. When the actuator 2 is in operation, the electronic module 1 represents a device that is designed and arranged to measure a rotational position of a rotor 6 of a drive unit 14 (electric motor) of the actuator 2 . The electronics module 1 basically has a housing 3 , which is also referred to as the electronics housing and has at least one cover 25 . In the operating state, this housing 3 is connected to a drive housing 26, in which a stator 15 of the actuator and the rotor 6 of the drive unit 14 are included, with the electronics housing 3 preferably being designed as a fixed component of the drive housing 26 (combination of functions). This means that the drive housing 26 fulfills the housing functions for the entire drive module including the stator 15, the rotor 6 and the electronics.

In the housing 3 / the electronics housing 3 of the electronic module 1, a printed circuit board 4 is positioned and accommodated, which printed circuit board 4 alone is also particularly good in the 6 until 9 is shown. The printed circuit board 4, which is also referred to as a circuit board, PCB electronics or PCB electronics unit, essentially extends in one plane. On the circuit board 4 is how particularly good in 6 as can be seen, on the one hand a capacitor 27 and on the other hand a plug 28 are arranged, which plug 28 enables the electrical supply of electrical energy and signal transmission to the printed circuit board 4 or away from it during operation.

Furthermore, a cover component 7 according to the invention is positioned and fastened on the printed circuit board 4 . How particularly good again also in 1 such as 6 until 9 can be seen, this cover component 7 is designed essentially in the shape of a plate. The cover component 7 is designed and shaped in such a way that it accommodates a rotor position sensor 5 in an accommodation space 8 formed between it and the printed circuit board 4 . A receiving space 8 is used here in particular because the rotor position sensor 5 is located in an axial intermediate space (the receiving space 8), while the cover component 7 is simultaneously supported stably on a surface of the circuit board 4 by means of two stop projections 13a and 13b. Each of the two stop projections 13a and 13b (also referred to as supporting projections) extending in an axial direction--in relation to a longitudinal axis 29 (corresponds to the axis of rotation) of the rotor 6--of the rotor 6 (seen in the installed state of the electronic module 1 in the actuator 2) is located thus with its stop surface 12a or 12b on the surface of the printed circuit board 4.

The stop projections 13a and 13b do not form a receiving space 8 that is completely closed off from the area surrounding the printed circuit board 4, but rather a receiving space 8 that is open to the side/to the area surrounding the cover component 7. The two strip-like support projections 13a and 13b are in turn integrally formed on a disk-shaped base section 31 of the cover component 7 . The base portion 31 extends, again in the assembled state after 1 until 3 seen essentially in the radial direction with respect to the longitudinal axis 29 of the rotor 6.

Are radially outside the stop projections 13a and 13b, as well as particularly good in connection with the 10 until 12 as can be seen, two holding elements 30a and 30b are formed on the cover component 7/base section 31. Both holding elements 30a and 30b are designed as pins 9 which, as is particularly evident in 9 can be seen, each inserted into a receiving opening 10 in the printed circuit board 4 and held there in a non-positive and positive manner. Instead of one or both holding elements 30a and 30b in the form of the pin(s) 9, it is also possible to design these as clips/ees, ie as a form-fitting holding element. While the pin 9 is held in the receiving opening 10 by means of a press fit in its longitudinal direction and form-fitting transversely thereto, the at least one clip would then be pushed through this receiving opening 10, which is then designed as a through-opening, in such a way that it encompasses the circuit board 4 in a form-fitting manner . In this embodiment, however, the first holding element 30a and the second holding element 30b are each designed as a pin 9 . By attaching the cover component 7 to the printed circuit board 4 by means of the two holding elements 30a and 30b, the cover component 7 is non-displaceable and non-rotatable during operation, ie fixed/held on the printed circuit board 4 in a non-positive and positive manner. As an alternative or in addition to this, the printed circuit board 4 is also connected to the cover component 7 in a materially bonded manner in a further embodiment.

On its radially outer side (seen with respect to the longitudinal axis of the rotor 6 in the assembled state), the substantially disk-shaped base portion 31 merges in a direction that extends in the axial direction but in an opposite direction to the stop projections 13a and 13a 13b extending away from the base portion 31 collar portion 32 over. As in 1 is clearly visible, this collar section 32 extends away from the printed circuit board 4 in the axial direction.

The printed circuit board 4 together with the cover 25/the housing 3 is arranged during operation relative to the drive unit 14 of the actuator 2 in such a way that the cover component 7 is arranged with its essentially rotationally symmetrical base section 31 centrally, i.e. coaxially to the longitudinal axis 29 of the rotor 6.

The detailed design of the drive unit 14 is also in 1 clearly visible. The drive unit 14 of the actuator 2 has the stator 15 in a conventional manner, with the rotor 6 being arranged so as to be rotatable relative to the stator 15 radially inside this stator 15 . The stator 15 is fixed to the housing, ie held fixed to the drive housing. The stator 15 has a stator housing 16, which is designed here as an overmolding. The housing of the stator 15, ie the stator receiving housing 16, is thus produced by injection molding. The stator receiving housing 16 together with the stator 15 extends radially outside of the rotor 6 around the latter.

The stator housing 16 is also particularly good in the 4 and 5 to recognize. Here you can see ( 5 ) that the coils of the stator 15 are arranged in the stator housing 16 overmolded. When the actuator 2 is in the assembled state, the rotor 6 protrudes into the stator 15 in such a way that its end region 17 facing the printed circuit board 4 is arranged directly adjacent to the cover component 7 . In this embodiment, in particular, a spindle 34 is connected to the rotor 6 in a rotationally fixed manner or forms part of the rotor 6 . The spindle 34 is connected in a rotationally fixed manner to a sleeve-shaped drive magnet receiving area 35 of the rotor 6, which drive magnet receiving area 35 is pushed onto the spindle 34 radially outside of it and is connected in a rotationally fixed manner to it. The drive magnet receiving area 35 accommodates several drive magnets in the usual way, which can be driven by the magnetic field generated by the stator 15 . The end area 17 of the rotor 6 is formed by an end of the spindle 34 of the rotor 6 that protrudes through the drive magnet receiving area 35 . The rotor position magnet 18 is fastened to this end region 17 and is non-rotatably connected to the rotor 6/the spindle 34 (the spindle 34 is usually part of a spindle drive, which is not shown here for the sake of clarity).

The rotor position magnet 18 is designed essentially in the form of a disk and generates a permanent magnetic field. The rotor position magnet 18 is thus designed as a permanent magnet. In the assembled state, the rotor position magnet 18 has moved so far in the axial direction of the rotor 6 to the rotor position sensor 5 / to the printed circuit board 4 that the magnetic field generated by the rotor position magnet 18 can be detected by the rotor position sensor 5 to determine the rotational position of the rotor 6. The rotor position sensor 5 is preferably a GMR or an iGMR sensor. However, the rotor position sensor 5 can also be an AMR (anisotropic magentoresistive effect) sensor or a sensor whose physical principle is based on a magnetoresistive effect in general or on the Hall effect (Hall sensor).

The collar section 32 of the cover component 7 is in turn attached to the stator housing 16 by means of a tongue and groove sealing interface 19, namely to a sealing interface area 11 formed by the stator housing 16 (alternatively also referred to as a support area) in the stator housing 16 (the so-called stator overmoulding). For this purpose, the stator receiving housing 16 has on this sealing interface area 11 a circular groove 22 of the tongue and groove sealing interface 19 running coaxially around the longitudinal axis 29 . The projection 21 , designed as a tongue section, of the tongue and groove connection 19 is then inserted into this groove 22 , this projection 21 being formed directly by an axial end of the collar section 32 . This collar section 32 forming a sealing interface/adhesive interface of the cover component 7 fixes the cover component 7 axially in the operating state relative to the stator receiving housing 16 and due to the axial mounting of the rotor 6 relative to the stator 15 also relative to the rotor 6 . The projection 21 is pushed into the groove 22 in the axial direction, with the projection 21 preferably forming a uniform sealing gap to the groove 22, filled with liquid sealant (adhesive substance 33), and is thus also mechanically fastened.

An adhesive connection 20 is provided for the sealing interface between the cover component 7 and the stator receiving housing 16 , which is implemented by means of the tongue and groove sealing interface 19 . This adhesive connection 20 connects the cover component 7 and the stator housing 16 to one another. For this purpose, an initially liquid, hardenable adhesive substance 33/adhesive substance of this adhesive connection 20 is filled into the groove 22 (in the liquid state), into which filled groove 22 the collar section 32 with its projection 21 is then pushed. After the adhesive substance 33 has hardened, a firm adhesive connection 20 is thus formed. Thus, during operation of the actuator 2, the cover component 7 is form (in the radial direction due to the tongue and groove connection 19), force (on due to the tongue and groove connection 19 designed as a press fit) and cohesively (due to the adhesive connection 20) to the stator receiving housing 16/the drive unit 14. Increased vibrations of the cover component 7 together with the circuit board 4 and the rotor position sensor 5 relative to the stator housing 16 are thereby avoided during operation. The adhesive substance 33 is a liquid sealing material that adheres to the two bonded components (cover component 7 and stator receiving housing 16) when it hardens.

As can also be seen (in particular in 4 and 5) the groove 22 is formed through the annular seal interface area 11 of the stator housing 16. In particular, two walls 23 and 24 extend in the axial direction, ie parallel to the longitudinal axis 29. An inner wall 32, which is arranged radially inside the collar section 32, extends further in the axial direction than an outer wall 24 of the groove 22. This is avoided as far as possible that when the collar section 32 is pushed into the groove 22 filled with the still liquid adhesive substance 33 and the corresponding displacement of the adhesive results, penetration of the adhesive substance 33 towards the rotor 6 is avoided. The inner wall 32 in particular extends so far in the axial direction that it completely surrounds/covers the axial length of the rotor 6 in the region of the rotor position magnet 18 .

The actuator 2, as in the 1 until 3 is shown, is then designed in operation as a clutch actuator, namely as a hydraulic clutch actuator. As an alternative to this, however, it is also possible in further embodiments to design this actuator 2 as a mechanical clutch actuator. In a further embodiment, the actuator 2 is also designed as a transmission actuator or as a transmission and clutch actuator. The rotor 6 together with the spindle 34 serves as the actuating means/actuating element, which causes a specific actuating movement either in a first or in a second direction of rotation, so that, for example, a clutch can be engaged or disengaged and/or a gear of a transmission disengaged by other structural elements - or is inserted.

In other words, an electronic module 1 is thus implemented, which has an equipped PCB (printed circuit board 4) with a connector module (connector 28). The electronics module 1 is then placed on/in an actuator housing (drive housing 26), this actuator housing 26 preferably being designed as an aluminum die-cast part (due to EMC, cooling of the power loss, vibration stability). The electronic module 1 (equipped PCB 4 with components and connector 28) is characterized in that a cover part (cover component 7) is mounted in a central area of the PCB 4 over the rotor position sensor 5 (which is used to sense the rotor position). The front area of the cover part 7 is designed in such a way that together with the sealing interface in the stator extrusion coating (stator receiving housing 16) a “tongue-groove” pairing (groove-tongue connection 19) is formed in the central area.

Depending on the installation space configuration, you can either design the board (projection 21) or the recess (groove 22) on the stator side (stator overmoulding). In the case described, the indentation is shown on the stator side because this combination brings advantages for the dispensing of the liquid seal (adhesive 33) and in the two sealing interfaces from the stator to the electronic module (in the central area where the rotor position sensor is and on the three Interfaces where the three motor cables / pins are routed to the electronics) is an advantage in terms of the application direction of the dispensing. In an alternative embodiment, the direction of the indentation and board elements can be reversed. The sealing interface from the side of the stator encapsulation 16 in the central area is designed with a longer wall (inner wall 23) of the recess from the inside (in the direction of the magnet), with the aim of providing protection during assembly and the displacement of certain amounts of adhesive against contamination of the inner parts ( rotor UZSB, magnet).

In the case shown, the assembly sequence is as follows: - Dispense liquid sealing material (adhesive substance 33) at the corresponding interfaces of the UZSB (subassembly) with the stator 15; - Assembly of the UZSB stator 15 and in particular the UZSB stator 15 with other mechanical parts of the actuator 2 depending on the design in the support housing (drive housing 26) of the actuator 2; - Assembly of the rotor UZSB with a spindle, bearing, the rotor 6 and/or the rotor position magnet 18 and, if necessary, other mechanical components of the actuator 2 (depending on the design, both UZSBs of the stator 15 and the rotor 6 can also be assembled in a previous step ); - Adjustment / adjustment (pressing) of the final axial position of the rotor position magnet 18 with a basic axial stop / axial position of the circuit boards 4 using an assembly tool; - Dispensing of thermally conductive adhesive / or thermally conductive paste to the corresponding heat dissipation surfaces in the support housing 26; and - assembly and fastening of the electronic module 1 (assembled PCB). The axial tolerance chain for setting the axial position of the rotor position magnet 18 is very short in this case and consists of: - waviness (surface tolerance) of the PCB 4, - "reflow" process tolerance of the solder layer thickness on the sensor module, - surface tolerance of the stop surfaces on the carrier housing 26 (im In the case of an aluminum die-cast housing, these are, according to the rule, additionally machined surfaces), - process accuracy: assembly process of pressing against the stop from the face of the rotor position magnet 18 (which is pre-assembled at a certain height on the actuator spindle in the rotor UZSB), and - surface tolerance of the face of the magnet 18 .

The cover part 7 is preferably designed as a plastic injection molded part. The construction is characterized by two pins (holding elements 30a, 30b) for orienting the part in openings in the printed circuit board 4 in the x/y plane and by spacers (stop projections 13a, 13b) for the stop in the z direction. Thus, on the one hand, the exact positioning of the cover part 7 in the x/y plane is achieved in order to ensure the uniformity of the adhesive gaps on the circumference compared to the stator sealing interface and, on the other hand, a minimum permissible air gap between the cover part 7 and the electronic components (including the rotor position sensor 5) on the PCB 4. The tolerances of the structure of the PCB 4 and the cover part 7 on the one hand, and the recess (groove 22) in the stator encapsulation 16 on the other hand in the axial direction should be done by appropriate dimensioning in the adhesive gap (liquid seal). Alternatively, one pin 30a or 30b or the two orientation pins 30a and 30b can also be designed as clips. This eliminates the need to dimension one of the pins 30a, 30b with a slight press fit to the PCB 4 (cover part 7 must remain mounted on the PCB 4 throughout transport and during the assembly process).

Reference List

1

electronics module

2

actuator

3

Housing / electronics housing

4

circuit board

5

rotor position sensor

6

rotor

7

cover component

8th

recording room

9

Pen

10

intake opening

11

seal interface area

12a

first stop surface

12b

second stop surface

13a

first stop projection

13b

second stop projection

14

drive unit

15

stator

16

stator housing

17

end area

18

rotor position magnet

19

tongue and groove sealing interface

20

adhesive connection

21

head Start

22

groove

23

inner wall

24

outer wall

25

lid

26

drive housing

27

capacitor

28

plug

29

longitudinal axis

30a

first holding element

30b

second holding element

31

base section

32

collar section

33

glue substance

34

spindle

35

drive magnet receiving area

Claims (10)

Actuator (2) for actuating a clutch and/or a transmission of a motor vehicle, with an electronics module (1), with a printed circuit board (4) and a rotor position sensor (5) which is used to detect a rotational position of a rotor (6) of the actuator (2 ) is prepared and fixed on the printed circuit board (4), wherein a cover component (7) defining the distance between the printed circuit board (4) and a sealing interface region (11) of a drive unit (14) containing the rotor (6) is connected to the printed circuit board (4) as a partial assembly of the printed circuit board (4) comprising the cover component (7) before the assembly of the partial assembly is connected to the sealing interface area (11), the electronics module (1) having an electronics housing (3) with a cover (25), the electronics housing (3 ) is an integral part of a drive housing (26) and the drive housing (26) comprises a stator (15) and the rotor (6) of the actuator (2) and the circuit board (4), characterized in that the deck El component (7) has a disc-shaped base portion (31), which is located on its radial outside in an axial has a collar section (32) extending away from the circuit board (4), the stator (15) has a stator housing (16) designed as an overmolding and the collar section (32) of the cover component (7) by means of a tongue and groove sealing interface (19) is attached to the stator receiving housing (16) radially inside the drive housing (26). actuator (2) after claim 1 , characterized in that the cover component (7) is attached and designed in such a way that the rotor position sensor (5) is arranged within a receiving space (8) formed between the printed circuit board (4) and the cover component (7). actuator (2) after claim 1 or 2 , characterized in that the cover component (7) by means of at least one holding element (30a, 30b) is fixed to the circuit board (4) in a form-fitting, force-fitting and/or material-locking manner. actuator (2) after claim 3 , characterized in that the at least one holding element (30a, 30b) is designed as a pin (9) and is fastened in a receiving opening (10) in the printed circuit board (4). actuator (2) after claim 4 , characterized in that the pin (9) is held in the receiving opening (10) via a press fit, while avoiding a relative displacement between the cover component (7) and the printed circuit board (4). actuator (2) after claim 3 , characterized in that the at least one holding element (30a, 30b) is designed as a clip. Actuator (2) after one of Claims 1 until 6 , characterized in that the cover component (7) has at least one stop surface (12a, 12b) via which the cover component (7) rests flat on the printed circuit board (4). Actuator (2) after one of Claims 1 until 7 , And with a drive unit (14) comprising a stator (15) which is accommodated in a stator receiving housing (16), and the rotor (6) which is arranged radially inside the stator (15) and can be rotated relative thereto, wherein on A rotor position magnet (18) is attached to an end region (17) of the rotor (6) facing the printed circuit board (4) and is arranged in the axial direction of the rotor (6) adjacent to the rotor position sensor (5) in such a way that it can be separated from this rotor position sensor ( 5) can be detected and a distance between the rotor position sensor (5) and the rotor position magnet (18) is fixed by the cover component (7). actuator (2) after claim 8 , characterized in that the cover component (7) is fastened to the circuit board (4) and the sealing interface area (11) formed by the stator receiving housing (16) in a positive, non-positive and/or material connection. actuator (2) after claim 8 or 9 , characterized in that the cover component (7) is attached to the stator housing (16) by means of an adhesive connection (20).

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