WO2012175491A2

WO2012175491A2 - Ultrasonic sensor device comprising a damping element and a mounting cover, arrangement and method for producing such an ultrasonic sensor device

Info

Publication number: WO2012175491A2
Application number: PCT/EP2012/061701
Authority: WO
Inventors: Thomas Jung; Hans-Wilhelm Wehling; Hubert Neft
Original assignee: Valeo Schalter Und Sensoren Gmbh; Volkswagen Aktiengesellschaft
Priority date: 2011-06-20
Filing date: 2012-06-19
Publication date: 2012-12-27
Also published as: DE102011105017A1; WO2012175491A3

Abstract

The invention relates to an ultrasonic sensor device (1) for a motor vehicle, comprising an ultrasonic sensor (2) that has a membrane (24) for emitting and/or receiving ultrasonic signals, a mounting cover (15) which is arranged adjoining the ultrasonic sensor (2) at the front end and by means of which the ultrasonic sensor (2) can be fixed to a lining part (39) of the motor vehicle, and a damping element (16) having a passage opening (30) for the membrane (24), the mounting cover (15) being made of a plastic material that is injection-molded onto the damping element (16).

Description

An ultrasonic sensor device having a damping element and a mounting lid, an arrangement and method for producing such an ultrasonic sensor device

The invention relates to an ultrasonic sensor device for a motor vehicle, comprising an ultrasonic sensor having a - in particular pot-shaped - membrane for emitting and / or receiving ultrasonic signals, and with a to the

Ultrasonic sensor on the front then mounting cover, on which the

Ultrasonic sensor can be fastened to a trim part of the motor vehicle. This means in particular that the mounting lid in the transmission direction in front of the

Ultrasonic sensor is arranged and thus the sound transmission through the

Mounting cover can take place therethrough or the mounting lid a

Through-opening may have, through which the membrane extends through, and in this case the front of the membrane with a front side of the mounting lid can be substantially flush The device also has a, in particular made of ceramic, damping element, which has a passage opening for the membrane. The invention also relates to an arrangement with such an ultrasonic sensor device and a trim part of a motor vehicle, in particular a bumper. The invention also relates to a method for producing such an ultrasonic sensor device.

Ultrasonic sensors are already state of the art and can be installed in a known manner in the front area and in the rear area of the motor vehicle, namely, for example, on the bumpers. The ultrasonic sensors are

Driver assistance devices assigned and provide information about the

Vehicle environment, and more precisely on the distances between the vehicle on the one hand and the obstacles located in its surroundings on the other.

Driver assistance devices may include, for example, parking assistance systems, systems for monitoring blind spots, systems for keeping distance,

Track monitoring systems, brake assist systems and the like. It is already known that such ultrasonic sensors are arranged concealed in bumpers. This means that they are arranged in continuous recesses or passage openings in the bumper and are visible on the outside. Here, the cup-shaped membrane of the ultrasonic sensor - the so-called aluminum pot - extends through the through hole of the bumper, so that a front side or front surface of the membrane flush with the externa ßeren surface of the bumper. As with the visibly installed sensors no obstacle

Sound propagation disturbs, the function of the converter, obstacles, for example, when parking the vehicle to recognize fully guaranteed.

In addition, concealed built transducer or ultrasonic sensors are known. These are thus on a view of the bumper from the outside not visible and covered by the bumper. In such installed ultrasonic sensors directly behind the bumper ultrasonic signals are transmitted through the material of the bumper or received. This always results in a symmetrical sound lobe, both horizontally and vertically. However, it is also desirable to be able to produce asymmetrical transmission directivity characteristics. Such asymmetric

Transmittance characteristics are advantageous for many applications. It is desirable for blind spot detection to be able to produce an asymmetrical transmission directivity. For parking assistance, it is also desirable that ultrasound sensors be narrower horizontally and vertically narrower

Transmitting characteristic are equipped.

In the case of visible and thus not concealed built-in ultrasonic sensors on the bumper of a vehicle they are arranged there by means of a holder, which is attached with a double-sided adhesive tape, hot caulked or ultrasonically attached to the bumper. The ultrasonic sensors can then be mounted in the holder. This attachment is sufficient for non-concealed converter built despite the large tolerances. The holder is rarely removed from the bumper. In a converter exchange, the converter is disengaged from the locking connection from the holder and the new converter can be locked immediately without further changes.

However, in the case of sensors installed obscured behind a bumper, which are preferred in this case, significantly higher requirements are placed on the positioning, the bonding and the tolerances now to be observed. The transducer or ultrasonic sensor must be mechanically fixed behind the bumper. This is necessary so that the ultrasonic sensor can transmit lossless through the bumper. To the To keep transmission and reception losses low, the transmission area of the

Ultrasonic sensors are mechanically fixed to the bumper connected or formed with a lossless coupling element between the transmitting surface of the ultrasonic sensor and the bumper. In order to keep the introduced vibrations locally and to influence the transmission directivity, an attenuation ring or stiffening element with a large modulus of elasticity is needed closely around the transducer. This damping ring must be mechanically fixed to the bumper or the holder. A corresponding embodiment of an electroacoustic transducer is known for example from DE 42 38 924 A1. However, this installation is only possible with completely flat bumpers, as shown in the prior art. In uneven bumpers this known design leads to significant disadvantages in terms of functionality, because the adhesive layer only limited

existing adhesive gaps can be bridged to a maximum of 0.2 mm without a loss of function.

A particular challenge is therefore to provide an ultrasonic sensor device in which a variable and flexible shoring of the ultrasonic sensor in a concealed arrangement behind a cowling, in particular a

Bumpers, is guaranteed and thus a situation-adapted attachment is possible. To ensure this, a mounting lid is proposed, which is arranged on the front side of the ultrasonic sensor or on the cup-shaped membrane and covers the ultrasonic sensor. About this hoody

Mounting cover, the ultrasonic sensor device or the single ultrasonic sensor is attached to the back surface of the trim part, wherein the mounting lid is also reversibly releasably connected to the ultrasonic sensor. By such an additional component, namely the mounting lid, the ultrasonic sensor device is improved so that they are suitable for a variety of circumstances or

geometric shapes can be arranged on the trim part of the vehicle and thereby both the attachment on the one hand in concealed design as well as the functionality of the ultrasonic sensor on the other hand is best possible ensured. The mounting lid covers the front of the membrane from the front.

The said mounting cover has au term on his the ultrasonic sensor

facing side a receptacle for the above-mentioned annular

Damping element made of ceramic. This damping element is therefore a

Stiffening element and has a through opening through which the cup-shaped membrane extends through to abut against the back of the mounting lid. The made of ceramic damping element prevents transmission of vibration to a larger area of the trim part, so that the radiation of the

Ultrasound signal can be limited accordingly. In the prior art, this damping element with its front side facing the trim part with the back of the plastic cover assembly formed using a

Coupled adhesive bond. However, it has turned out that such

Adhesive connection of the two components damping element and mounting lid is insufficient, because no good mechanical adhesion of the mounting lid on the damping element over the entire required temperature range and thus no independent of the temperature reliable sound transmission can be achieved. This is because the ceramics are difficult to match with the

Connect plastic material or the two materials have so different properties that at the given application and the given vibration pressure of the membrane connecting the mounting lid with the

Damping element or stiffening element is insufficient.

It is an object of the invention to provide a solution, as the life of an ultrasonic sensor device of the type mentioned can be increased compared to the prior art.

This object is achieved by an ultrasonic sensor device, by an arrangement and by a method having the features according to the respective independent claims. Advantageous embodiments of the invention are the subject of the dependent claims, the description and the figures.

An inventive ultrasonic sensor device for a motor vehicle comprises an ultrasonic sensor, a mounting cover and a damping element, which is a stiffening element and is formed, for example, of ceramic. Of the

Ultrasonic sensor has a - in particular pot-shaped - membrane for emitting and / or receiving ultrasonic signals. The mounting lid is on the

Ultrasonic sensor then arranged front, which means that the

Mounting cover is arranged in the transmission direction in front of the ultrasonic sensor and the sound transmission can thus take place through the mounting cover or the mounting cover may have a through opening through which the membrane extends through, and thereby close the front of the membrane with a front of the mounting lid substantially flush can. On the

Mounting cover is the ultrasonic sensor on a cowling of the motor vehicle attached. The mounting lid may optionally be on its the ultrasonic sensor

facing back have a receptacle in which the annular

Damping element can be arranged. Also optionally it can be provided that the mounting lid is reversibly releasably connectable to a receiving part for the ultrasonic sensor. The damping element has a passage opening through which the membrane extends. According to the invention it is provided that the

Mounting cover is formed of a plastic material, which on the

Damping element is molded.

In this way, a particularly reliable and well-adhering integral connection between the damping element on the one hand and the mounting lid on the other hand allows, so that the damping element is integrally formed with the mounting lid and thus the life of the entire ultrasonic sensor device is improved compared to the prior art. The inventive

Procedure also has the advantage that no further assembly step in the assembly of the ultrasonic sensor device to the associated trim part of the

Motor vehicle is required, namely the step of attaching the

Damping element on the mounting lid. By overmolding the

Damping element with the plastic material, the mounting cover au ßerdem tensioned around the damping element tolerance. Not least, the production of the ultrasonic sensor device by encapsulating the damping element with the plastic material is much easier, because the damping element no longer has to be laboriously connected to the mounting cover, for example by means of an adhesive connection. Overall, the procedure according to the invention thus makes it possible to achieve a particularly reliable frictional or positive fit and thus particularly well

vibration-transmitting connection between the damping element and the mounting cover made of plastic, which au except without screws and without similar fasteners.

Preferably, the above-mentioned plastic material is a PP plastic, ie

Polypropylene. Especially in this embodiment, the encapsulation of the damping element proves to be particularly advantageous because, as is known, such a PP plastic is difficult to bond with a damping element made of ceramic.

In an embodiment it can be provided that the damping element is formed of ceramic. Thus, the transmission of the mechanical vibration can be particularly reliably and effectively limited, and the radiation characteristic The ultrasonic sensor device can thus be designed defined. The

Overshaping according to the invention also proves to be particularly advantageous, especially with a combination of PP plastic, on the one hand, and ceramic, on the other hand.

Preferably, at least one recess, in particular a plurality of such recesses, is formed in the damping element. The mounting cover has in this embodiment at least one pin which engages in the associated recess of the damping element, wherein the at least one pin is formed by the injection molding of the plastic material. By such a combination of at least one pin on the one hand and the corresponding recess on the other hand, the mechanical adhesion and the mechanical strength of the connection between the damping element and the mounting lid due to the now given cohesive and non-positive and positive coupling can be brought to a maximum, and it can a particularly reliable and non-slip connection can be made. By the at least one additional pin, and in particular by a plurality of such pins, and the distance of the free, unattached surfaces is reduced, so that a release of the damping element of the mounting lid can be prevented due to about a linear expansion or due to different expansion coefficients.

The plurality of recesses are preferably distributed around the passage opening through which the cup-shaped membrane is inserted.

In particular, it is provided that the plurality of recesses are arranged distributed annularly and equidistantly around the passage opening around. These

Embodiment has the advantage that the mechanical adhesion or the mechanical connection is virtually reliable at each point.

It proves to be advantageous if the at least one pin in a first

Length range having a greater width than in a second length range is formed, wherein the first length range closer to the ultrasonic sensor than the second

Length range is. Thus, a non-slip arrangement of the mounting lid or the damping element is ensured in the axial direction. It proves to be advantageous if a step is formed between the first and the second length range. Thus, it is prevented that the damping element of the

Mounting cover in the axial direction triggers. The at least one recess is preferably formed as a continuous opening or bore in the damping element, and the associated pin can be flush with a facing away from the mounting lid and the ultrasonic sensor facing back of the damping element. This means that the at least one pin is also visible from the rear side of the damping element facing away from the mounting lid, and together with the surface of this rear side forms a flat or flush surface. Such a continuous bore has the advantage that this opening can be formed without much effort with two different diameters, namely, for example, from the front side with a smaller diameter and from the back of the damping element with a larger diameter. When encapsulating the damping element, the plastic material then succeeded in this continuous recess and fills it, so that the resulting pen also two

having different diameters, namely a larger diameter in the first length range and a smaller diameter in the second axial length range.

Is in addition even before the encapsulation of the damping element same element provided with a well-adherent adhesive layer, which during encapsulation of the

Damping element dissolves and connects to the plastic element, a vibration over the entire life of the motor vehicle and particularly strong connection between the damping element and the mounting lid is achieved. Thus, in one embodiment it is provided that an adhesive layer is arranged between the mounting lid and the damping element.

If, in addition, before the encapsulation of the damping element, the same element is provided with a silanized surface, which bonds well with the liquid plastic during encapsulation, an even better adhesion can be made possible. In one embodiment, it can thus be provided that, before the encapsulation of the damping element, it is silanized at least in some areas.

Overall, the mounting lid is thus formed integrally with the damping element.

Preferably, a receiving part is provided, in which the ultrasonic sensor can be inserted or latched. It can be provided that this receiving part for holding the ultrasonic sensor with the mounting lid is reversibly releasably connectable. For this purpose, the mounting lid preferably has at least one latching element on an edge-side circumferential web. It can thus be the releasable Connection can be formed as a latching connection. This is on the one hand robust and on the other hand easy to handle, the insertion or removal of the

Ensuring ultrasonic sensor. The dismantling of the ultrasonic sensor can be done so that by loosening the mounting lid, the splice between the sensor and the mounting lid is released and then the defective sensor can be removed.

Thus, the ultrasonic sensor may be arranged in the receiving part, which is designed for connection, in particular for locking, with the mounting lid. The ultrasonic sensor is thus additionally protected again and virtually via such an adapter, which is the receiving part and the

Ultrasound sensor receives as much as possible, on the one hand protected and on the other hand easily connectable to the mounting lid. A direct force on the ultrasonic sensor can be avoided. In addition, no holding forces in the fully assembled state of the ultrasonic sensor device by the connection with the mounting lid on the ultrasonic sensor, so that only corresponding connection forces between the mounting lid and the receiving part arise.

Such a holding device, which is formed by the mounting lid on the one hand and the receiving part on the other hand, which can be detachably connected to each other destructively, makes it possible to hold the ultrasonic sensor firmly in its position in concealed construction behind the cowling.

In particular, it can also be provided that the ultrasonic sensor has two latching elements, which engage in resilient complementary latching tabs of the receiving part, whereby a corresponding positioning of the ultrasonic sensor is achieved in the receiving part.

In a particularly advantageous manner, this locking connection is also designed so that a certain contact pressure of the membrane of the ultrasonic sensor is generated at the mounting lid. As a result, the preferably provided bonding is then supported, in which the ultrasonic sensor is pressed against an adhesive surface. It can be provided that the mounting lid on his the

Ultrasonic sensor facing back has a central surface area for conditioning for the membrane of the ultrasonic sensor. The damping element or stiffening element is preferably designed as a completely closed ring. It can also be provided that the front side and the rear side of the damping element are designed differently. In particular, the front side, with which the damping element is arranged in the mounting cover, have a certain inclination, for example a conical shape.

As a result, the largest possible possible installation in the mounting lid or a large area connecting surface can be achieved.

In particular, the back of the damping element is flat, so that a corresponding system is ensured in the above-mentioned receiving part for the ultrasonic sensor.

Preferably, the damping element is around the above-mentioned central

Surface area of the mounting lid arranged around. This central area is thus not covered in the axial direction by the damping element, so that in particular the membrane of the ultrasonic sensor by the annular

Damping element extends through and comes directly into contact with the central surface area.

The invention also relates to an arrangement with an inventive

Ultrasonic sensor device and with a trim part, in particular a bumper, on the back of the mounting lid is fixed with its front side.

It is preferably provided that the front side of the mounting lid is adapted to the shape of the back of the trim part, in particular the front side rests over its entire surface on the back. A very individual design of the

Ultrasonic sensor device can thereby be achieved, and this solely by the fact that the mounting lid has individual shapes and configurations.

It can also be provided that the front side of the mounting lid is glued to the back of the trim panel. With the mounting lid, a full-surface bonding to the back of the trim panel can be ensured by preferably the same contour and thus shaping on the front side of the

Mounting lid is formed in relation to the local mounting position.

The mounting lid can also be made of the same material as the trim part. Alternatively, it can also be provided that the mounting cover is formed of a harder plastic than the covering part, in order to reduce the modulus of elasticity over the temperature and to improve the transmission directivity of the ultrasonic sensor.

A motor vehicle according to the invention comprises an arrangement according to the invention.

The invention also includes a method for producing a

An ultrasonic sensor device for a motor vehicle by providing a

Ultrasonic sensor having a membrane by providing a

annular damping element having a through opening through which the membrane is inserted through, as well as by providing a mounting lid for mounting the ultrasonic sensor to a trim part of the motor vehicle. The mounting lid is formed of a plastic material which is attached to the

Damping element is molded.

The preferred embodiments presented with reference to the ultrasonic sensor device according to the invention and their advantages apply correspondingly to the arrangement according to the invention, to the motor vehicle according to the invention and to the method according to the invention and vice versa.

Further features of the invention will become apparent from the claims, the figures and the description of the figures. The features and feature combinations mentioned above in the description as well as the features and feature combinations mentioned below in the description of the figures and / or shown alone in the figures are not only in the respectively indicated combination, but also in others

Combinations or used alone.

The invention will now be explained with reference to a preferred embodiment, as well as with reference to the accompanying drawings.

Showing:

Fig. 1 is a schematic representation of an exploded view of a

An ultrasonic sensor device according to an embodiment of the invention; 2 shows a schematic illustration of the ultrasonic sensor device according to FIG

Fig. 1 from a different angle;

Fig. 3 is a schematic illustration of the ultrasonic sensor device in an assembled state;

4 is a schematic representation of the front side of a mounting cover and a damping element;

Fig. 5 shows a schematic representation of the back of the mounting lid and the

Damping element;

Fig. 6 in a schematic representation of the mounting lid with the

Damping element, wherein the mounting lid is molded onto the damping element;

7 is a schematic representation of a sectional view through the mounting cover and the damping element according to FIG. 6;

8 is a schematic representation of an arrangement according to a first

Embodiment of the invention; and

Fig. 9 in a schematic representation of an arrangement according to a second

Embodiment.

In the figures, the same or functionally identical elements are the same

Provided with reference numerals.

In Fig. 1, an ultrasonic sensor device 1 is shown in an exploded view. This includes an ultrasonic sensor 2, the non-destructive solvable in one

Receiving part 3 fastened, in particular latched, is. For this purpose, two latching elements 4 and 5 are formed by way of example, which are provided for latching in latching tabs 6 and 7 of a receiving shaft 8 of the integrally formed from plastic receiving part 3. The receiving part 3 also comprises a base 9, which is cylindrical and has a larger diameter than the receiving shaft 8. At one edge 10 of the base 9 are also two locking tabs 1 1 and 12th

educated. In this locking elements 13 and 14 of a disc-shaped

Lock mounting lid 15. The mounting lid 15 is integrally formed of plastic and connected by the latching with the receiving part 3 and non-destructive and reversibly releasably connected thereto. Through the mounting lid 15 and the

Receiving part 3 is a holder or a holder formed in two parts. As a result, a highly flexible and variable configuration of the ultrasonic sensor device 1 can be ensured and a wide variety of installation options of the ultrasonic sensor device 1 in a wide variety of installation situations on a trim part of a vehicle can be made possible.

In the exemplary embodiment, the ultrasonic sensor device 1 moreover also includes a damping element 16, which is designed as a ring and as

Stiffening element is used. The damping ring 16 is formed for example of ceramic. On the one hand, it serves to dampen the vibration transmission to the

Covering part, on the other hand, it serves to limit the signal radiation of the ultrasonic sensor. 2

The mounting lid 15 has a recess 18 on its rear side 17 facing the ultrasonic sensor 2. This is limited circumferentially and circumferentially by a web 19, to which the locking elements 13 and 14 are formed. When installed, the ultrasonic sensor 2 extends into the recess 18. The mounting lid 15 has on its side facing the ultrasonic sensor 2 inside 17 a bottom of the recess 18, on the one hand by a flat circular

Central surface area 20 and a radially outwardly adjoining it

Receiving area 21 is formed with the contact surface 22 for the system of the damping element 16.

In the mounting lid 15 is preferably a transmission sealing element or a

Emitter light characteristic element arranged, in particular integrated. Preferably, this is formed in the region of the central surface region 20, so that thereby emitted by the ultrasonic sensor 2 ultrasonic signals with desired

Signal characteristic are transmitted. In the mounting lid 15, a transmission element 23 is therefore also formed, which in particular has the functionality of the transmission directivity. Instead of the central surface area 20 can also be provided that the

Mounting cover 15 has a central circular passage opening through which the membrane 24 extends therethrough. Here, the front side 25 of the membrane 24 can be flush with the front side 31 of the mounting lid 15. With such a passage opening, which is indicated schematically in Fig. 2 with 40, is the

Sound pressure, the decay time and the directional characteristics of the

Ultrasonic sensor device 1 improved overall.

FIG. 2 shows an exploded view of the ultrasonic sensor device 1 from another viewing direction. The ultrasonic sensor 2 has a diaphragm 24 which is, for example, an aluminum pot having a front part 25. The front part 25 represents a front side of the membrane 24 and has a flat outer surface which comes into abutment with the central surface region 20 and is adhesively bonded. Is this

Transmission element 23 formed with the function of the transmission directivity, the coupling surface of this transmission element 23, for example, oval or rectangular and smaller in area than the surface of the outside of the front part 25th

In addition, it can be seen in the illustration according to FIG. 2 that the base 9 has, on its inner upper side, a groove 26 which serves to receive the

Damping element 16 is formed. This subset 19 also has an opening 27, through which the membrane 24 of the ultrasonic sensor 2 extends, in order to be able to come into abutment with the central surface region 20.

In the exemplary embodiment shown, it is provided that the damping element 16 has a rear side 28 (FIG. 1) which is flat. This comes then in full contact with the bottom of the groove 26th

In addition, the damping element 16 comprises an inclined front side 29 (FIG. 2), which is inclined in particular in the shape of a cone. This means that the front side 29 is oriented such that the damping element 16 is thinner at the edge than in the region of an opening 30.

The front side 29 comes into full surface contact with the complementary thereto inclined contact surface 22 of the receiving area 21st The mounting lid 15 has a front side or outer side 31, which is shaped individually and to the effect that it is preferably designed for full-surface contact with an inner side of a trim part, in particular a bumper of the vehicle.

In Fig. 3, the assembled state of the ultrasonic sensor device 1 is shown. The almost complete recording of the ultrasonic sensor 2 in the receiving shaft 8 can be seen. In particular, the latching arrangement can be seen. In addition, the latching arrangement between the mounting lid 15 and the receiving part 3 is shown.

Now, the interest is directed to the design of the component pair of the damping element 16 on the one hand and the mounting lid 15 on the other. in the

Embodiment is provided that in the manufacture of the

Ultrasonic sensor device 1, first, the damping element 16 is made of ceramic, which is then encapsulated with a PP plastic material, so that the mounting lid 15 is formed by this encapsulation. The PP plastic is stretched around the ceramics without damage by encapsulation. After encapsulation so arise two integrally interconnected parts, as shown separately in FIGS. 4 and 5 from each other. As is apparent from FIGS. 4 and 5, the damping element 16 in addition to the passage opening 30 for the membrane 24 of the ultrasonic sensor 2, a plurality of recesses 32, which as

continuous openings or holes are formed, which are parallel to

Passage opening 30 extend in the axial direction. These recesses 32, of which only one is designated for the sake of clarity, have a significantly smaller diameter than the central passage opening 30.

As further shown in Fig. 4, in the center of the mounting lid 15, the above-mentioned circular through hole 40 may be provided. Through this, the membrane 24 of the sensor 2 can then be inserted through, so that the front side 25 of the membrane 24 is flush with the front side 31 of the mounting lid 15.

With reference to FIG. 7, the continuous recesses 32 have a first length region 33 and a second one adjoining in the axial direction

Length range 34, wherein the first length portion 33 is closer to the ultrasonic sensor 2 and thus the back 28 of the damping element 16 faces. The first axial length region 33 has a slightly larger diameter than the second axial length region 34, namely such that between the two longitudinal regions 33, 34, a step 35 is formed.

The recesses 32 are further around the through hole 30 around

arranged equidistantly and annularly distributed, wherein in the embodiment, a total of twelve such recesses 32 are provided. This number is given by way of example only, and several or even fewer recesses 32 may be provided. The number of recesses 32 may be greater than four, for example.

Now, if the PP plastic molded onto the damping element 16, the plastic material also flows into the recesses 32 and fills selbige. Because that

Damping element 16 rests with its rear side 28 on the injection molding tool, the plastic material flows up to the axial end of the recesses 32. Thus, there are pins 36, which terminate flush with the back 28. These pins 36 then have the shape of the recesses 32 and thus also have a corresponding first axial length region 33 and a second axial length region 34 with different diameters. Because the diameter of the first length region 33 is greater than that of the second length region 34, there is virtually a riveted connection between the damping element 16 and the

Mounting lid 15.

Before injection molding can also be an adhesive layer on the front side 29 of the

Damping element 16 are applied. Then this adhesive layer dissolves during encapsulation and thus connects to the plastic material. Thus, over the entire life of the motor vehicle reliable and reliable connection is reached over the mechanical vibrations can be transmitted effectively.

In Fig. 6, the damping element 16 is shown in more detail after the encapsulation of its rear side 28. In this embodiment, the mounting lid 15 comprises a plurality of said locking elements 13, which are arranged distributed on the circumferential web 19 in the circumferential direction. In the through hole 30, the cup-shaped membrane 24 can now be inserted through, so that the front surface 25 of the membrane 24 comes into contact with the central surface region 20 on the back 17 of the mounting lid 15. FIG. 8 shows a schematic sectional view of a first exemplary embodiment of an arrangement 37. In this case, the ultrasonic sensor device 1 is fastened to a rear side 38 of a trim part designed as a bumper 39. As can be seen, the back 38 is flat, so that a front side or

Outside 31 of the mounting lid 15 is also flat. The

Ultrasonic sensor device 1 is shown here only with the mounting lid 15 and the damping element 16.

FIG. 9 shows a further exemplary embodiment of an arrangement 37. Here, in contrast to the embodiment according to FIG. 8, the bumper 39 is curved or curved at its rear side 38. As can be seen in the sectional view, in this case the front side 31 of the mounting lid 15 is shaped to be complementary and curved in a corresponding manner, so that the front side 31 bears against the rear side 38 over its entire surface and is glued correspondingly. In particular, in such a configuration is then provided that the contact surface 22 of the receptacle 21 of the mounting lid 15 is also inclined and the inclination is adapted to the shape of the back 38. In particular, the front side 29 of the damping element 16 is then also inclined in a complementary manner, so that again this is possible as far as possible over a whole area of the damping element 16

Front side 29 is guaranteed at the contact surface 22.

Claims

claims

1 . Ultrasonic sensor device (1) for a motor vehicle, comprising an ultrasonic sensor (2) having a membrane (24) for emitting and / or receiving

Having ultrasound signals, with a front of the ultrasound sensor (2) subsequently arranged mounting lid (15), via which the

Ultrasonic sensor device (1) on a cowling part (39) of the motor vehicle can be fastened, and with a damping element (16) having a

Through opening (30) for the membrane (24),

characterized in that

the mounting lid (15) is formed from a plastic material, which is molded onto the damping element (16).

2. ultrasonic sensor device (1) according to claim 1,

characterized in that

the plastic material is polypropylene plastic.

3. ultrasonic sensor device (1) according to claim 1 or 2,

characterized in that

the damping element (16) is formed of ceramic.

4. Ultrasonic sensor device (1) according to one of the preceding claims, characterized in that

in the damping element (16) at least one recess (32), in particular a plurality of recesses (32), is formed, and the mounting lid (15) has at least one pin (36), which in the associated recess (32) the damping element (16) engages, wherein the at least one pin (36) is formed by the injection molding of the plastic material.

5. ultrasonic sensor device (1) according to claim 4,

characterized in that

the plurality of recesses (32) are distributed around the passage opening (30), in particular annularly and equidistantly.

6. ultrasonic sensor device (1) according to claim 4 or 5,

characterized in that

the at least one pin (36) is formed in a first length region (33) with a greater width than in a second longitudinal region (34), wherein the first longitudinal region (33) lies closer to the ultrasonic sensor (2) than the second longitudinal region (34) ,

7. An ultrasonic sensor device (1) according to claim 6,

characterized in that

between the first and the second longitudinal region (33, 34) a step (35) is formed.

8. Ultrasonic sensor device (1) according to one of claims 4 to 7,

characterized in that

the at least one recess (32) as a continuous opening in the

Damping element (16) is formed and the associated pin (36) facing away from the mounting lid (15) and the ultrasonic sensor (2) facing the rear side (28) of the damping element (16) flush.

9. ultrasonic sensor device (1) according to one of the preceding claims,

characterized in that

between the mounting lid (15) and the damping element (16) a

Adhesive layer is arranged.

10. Ultrasonic sensor device (1) according to one of the preceding claims,

characterized in that

the mounting lid (15) is formed integrally with the damping element (16).

1 1. Arrangement (37) with an ultrasonic sensor device (1) according to one of the preceding claims, and with a covering part (39), on the rear side (38) of the mounting lid (15) with its front side (31) is attached.

12. Arrangement (37) according to claim 1 1,

characterized in that

the front side (31) of the mounting cover (15) is adapted to the shape of the rear side (38) of the trim part (39), in particular the front side (31) bears against the rear side (38) over its entire surface.

13. A method for producing an ultrasonic sensor device (1) for a

Motor vehicle by:

Providing an ultrasound sensor (2) having a membrane (24) for emitting and / or receiving ultrasound signals,

- Providing a damping element (16) having a passage opening (30) through which the membrane (24) is inserted through, and

Providing a mounting cover (15) for fastening the ultrasonic sensor (2) to a trim part (39) of the motor vehicle,

characterized in that

14. The method according to claim 13,

characterized in that

in the damping element (16) at least one recess (32), in particular a plurality of recesses (32) is formed, and the mounting lid (15) with at least one pin (36) is formed, which in the associated

Recess (32) of the damping element (16) engages, wherein the at least one pin (36) is formed by the injection molding of the plastic material.

15. The method according to claim 13 or 14,

characterized in that

an adhesive layer is applied to the damping element (16) prior to injection molding.