CAP OF A MOTOR VEHICLE

Description

[0001] The invention relates to a flap of a motor vehicle. The flap has a flap body to which a decorative strip is attached on the outside.

[0002] Motor vehicles typically have multiple hatches through which loading and / or entry into the interior of the vehicle is possible. Examples of such hatches include a tailgate, a hood, or side doors. Each of these hatches typically has a hatch body that is movably mounted on the body of the vehicle. The hatch body is generally designed to be relatively robust and is therefore usually made of metal. To create a visually appealing / attractive appearance and to prevent corrosion, the hatch body is usually painted. If the hatch body hits an obstacle when the hatch is opened, it is possible that the hatch body will be deformed. On the other hand, the paintwork may be at least partially damaged, making corrosion possible. In both cases, repairs are relatively costly.

[0003] To remedy this defect, a decorative strip is usually provided, which is arranged on the outside of the respective flap body. The decorative strip usually protrudes from the respective flap body, so that when the flap encounters an obstacle, it first comes into contact with the decorative strip, thus protecting the flap body. The decorative strip is usually made of a plastic that is relatively elastic. Therefore, even if the flap is brought relatively gently against the obstacle, no damage occurs. Should the flap nevertheless become damaged, only the decorative strip needs to be replaced, which is comparatively inexpensive.

[0004] Increasingly, the vehicle's surroundings are also being monitored for objects using a sensor. This is useful, for example, when maneuvering the vehicle, to prevent it from colliding with an object. The adjustment range of the tailgates is also typically monitored using a corresponding sensor to ensure that there are no obstacles within the vehicle when the tailgate is moved.

[0005] A capacitive sensor, for example, is used as such a sensor. However, its spatial resolution is comparatively low. An alternative to this is monitoring using a camera, although uninterrupted operation requires adequate ambient lighting. Dirt on the camera also significantly disrupts its operation. A preferred variant is therefore the use of a radar sensor, which can detect a corresponding obstacle with comparatively precise spatial resolution, essentially independent of the weather. In this case, the operation of the sensor is also invisible to the user, thus avoiding any inconvenience.

[0006] However, since the radar waves emitted and received by the radar sensor cannot fully penetrate the metal of the flap body, or are at least comparatively significantly attenuated, a cutout is usually provided in the flap body through which the radar waves can enter and exit. To prevent foreign particles from entering the vehicle or excessive air exchange, the cutout is usually sealed with a material that is transparent to radar waves, such as plastic. To ensure this is achieved and to prevent any undesired effects on the radar waves, comparatively low manufacturing tolerances are selected. The flap body assembled in this way is usually fully painted, so that the cutout is not visible to the user. As a result, manufacturing costs are comparatively high.

[0007] US 2019 / 0128040 A1 discloses a detector system and a method for operating the detector system. The detector system comprises a supply unit and at least one sensor for detecting at least one object and one movement. A communication unit is electrically connected to the supply unit for communicating with a number of vehicle system controllers. A microprocessor is operable in a number of modes and is connected to the supply unit, the at least one sensor, and the communication unit.

[0008] DE 20 2020 104648 U1 discloses a vehicle attachment with an integrated sensor module. The sensor module comprises a cover with an outer side and an inner side, wherein the cover is made, at least in sections, of a transparent thermoplastic material. Furthermore, the sensor module comprises a support part arranged on the inner side of the cover, and an indentation in the cover and the support part that is set back from the outer side of the cover.

[0009] The invention is based on the object of providing a particularly suitable flap of a motor vehicle, wherein manufacturing costs are advantageously reduced.

[0010] According to the invention, this object is achieved by the features of claim 1. Advantageous further developments and refinements are the subject of the respective subclaims.

[0011] The flap is a component of a motor vehicle, particularly a land-based one. The motor vehicle is expediently essentially freely positionable on a roadway and thus not rail-guided. For example, the motor vehicle is a commercial vehicle, such as a lorry or bus. However, the motor vehicle is particularly preferably a passenger car.

[0012] The flap has a flap body. The flap body is in particular flat and serves to close an opening in a body of the motor vehicle. The flap body is suitable, in particular provided and configured, for this purpose. In particular, it is possible to move the flap body and thus the flap into an open and also a closed position. For example, the flap body is made from a single component, which is suitably made other than metal, or the flap body comprises several individual components. In the assembled state, the flap body is in particular movably mounted on the body of the motor vehicle, for example pivotably or at least partially transversely displaceable. For this purpose, the flap expediently comprises a corresponding bearing unit, for example a hinge.Such a flap is, in particular, a tailgate, a hood, or, for example, a door that is pivotably mounted. Alternatively, the flap is a sliding door.

[0013] The flap further comprises a decorative strip, such as one that is attached to the outside of the flap body. In other words, the decorative strip is located on the side of the flap body facing away from the other components of the motor vehicle and at least does not protrude into the interior of the motor vehicle when the flap is closed. Thus, the decorative strip preferably forms at least partially an outer boundary of the motor vehicle. The decorative strip is expediently made of a plastic and, for example, painted in the same color as the flap body. In particular, the decorative strip is detachably attached to the flap body, for example by means of clips.

[0014] The decorative strip accommodates a radar sensor unit, which includes a housing. Thus, the radar sensor unit is provided as a single unit, with the radar sensor unit being mounted by assembling the housing. The housing is completely accommodated by the decorative strip and thus enclosed by the decorative strip. As a result, the radar sensor unit is protected by the decorative strip, eliminating the need for a comparatively robust design for the radar sensor unit's housing. This reduces manufacturing costs.

[0015] Since the radar sensor unit is also housed in the trim strip, it is not visually perceptible from outside the vehicle, thus improving its visual appearance. Furthermore, the radar sensor unit is located outside the vehicle, so the radar waves emitted and received by the radar sensor unit are not affected or distorted by the flap body. This simplifies operation of the radar sensor unit, and it can be operated with comparatively low power. The accuracy of object detection by the radar sensor unit is also improved. This eliminates the need to adapt the flap body accordingly, thus reducing manufacturing costs.

[0016] Since the radar sensor unit is positioned relatively far outward due to the position of the trim strip, i.e., outside the interior of the vehicle and protruding beyond the flap body and other body components made of metal, the potential monitoring area is also increased. As a result, it is possible to monitor a relatively large area with a single radar sensor unit, eliminating the need for multiple such radar sensor units. This further reduces manufacturing costs.

[0017] The radar sensor unit, for example, operates at a frequency of essentially 18 GHz. Thus, during operation, radar waves are emitted at a frequency of essentially 18 GHz. However, the radar sensor unit is particularly preferably operated at a frequency between 78 GHz and 81 GHz. Consequently, during operation, radar waves are emitted / received at a frequency between 78 GHz and 81 GHz. Due to the increased frequency, both the bandwidth and the range resolution are increased. In a further development, several radar sensor units are accommodated in the decorative strip, thus improving spatial resolution. For example, the radar sensor unit is thermally contacted with the flap body. This means that the radar sensor unit is cooled via the flap body, which increases operational safety and reliability.

[0018] In one embodiment, the radar sensor unit serves as anti-pinch protection. Alternatively, the radar sensor unit serves to monitor an adjustment range of the flap during operation. Preferably, the radar sensor unit monitors during operation whether the flap, in particular the flap body and / or the trim strip, is pivoted against a curb or other obstacle. If a curb or the like is identified, a warning is issued. If the flap is adjusted by an electric motor, the electric motor is preferably stopped in this case, thus ending the adjustment. The radar sensor unit thus serves as collision protection. Alternatively, a gesture or the like performed by a user of the motor vehicle is detected during operation by the radar sensor unit.In particular, depending on the detected gesture during operation, an assistance system of the motor vehicle is activated, for example the electric motor if present, so that the flap body is subsequently pivoted. In a further alternative, the radar sensor unit is used to monitor the surroundings of the motor vehicle so that the motor vehicle is not moved into an obstacle detected by the radar sensor unit when maneuvering. In summary, the radar sensor unit thus serves either to detect the surroundings or to avoid collisions, particularly in the case of automatically driven flaps such as hinged doors (side doors, tailgates, frunk flaps) or sliding doors. Preferably, the radar sensor unit is provided and configured to monitor an area extending between 1 m and up to 0 m from the motor vehicle. In particular, the output power is adjusted accordingly. This reduces energy consumption on the one hand.On the other hand, excessive radiation exposure is avoided.

[0019] The shape of the housing is preferably similar to the shape of the decorative strip, so that the housing can be accommodated by the decorative strip. In particular, the housing has a comparatively elongated shape. The housing is expediently designed to be comparatively flat and elongated, which simplifies assembly. For example, the horizontal dimension of the housing, which is directed away from a motor vehicle, is preferably comparatively small, for example less than 1 cm or 0.5 cm. In the other horizontal direction, which is perpendicular to this, the dimension is comparatively large, for example greater than 2 cm, 5 cm or 10 cm. This means that, on the one hand, sufficient volume is provided within the housing for the individual components of the radar sensor unit. On the other hand, this means that modification of existing decorative strips or at least their external dimensions is not necessary.

[0020] The decorative strip preferably has a receptacle that is provided and configured for the radar sensor unit, in particular the housing. The receptacle is preferably designed as a recess and, for example, is closed on the periphery. However, the recess is particularly preferably cup-shaped, thus simplifying installation of the housing on the decorative strip. This makes it possible to insert the radar sensor unit into the recess after the decorative strip has been manufactured.

[0021] In one variant, the radar sensor unit is attached to the flap body, preferably by means of a support structure. The radar sensor unit is concealed by the decorative strip. For this purpose, the radar sensor unit lies in the receptacle and is thus held by the decorative strip. The radar sensor unit is arranged loosely in the receptacle, for example. In other words, the radar sensor unit is not directly attached to the decorative strip.

[0022] For example, the radar sensor unit is detachably attached to the trim strip, either by screwing or clipping. This allows a faulty radar sensor unit or a damaged trim strip to be replaced separately without having to replace the other part as well.

[0023] Alternatively, the housing can be encapsulated with the trim strip. This prevents the penetration of dirt particles or liquids into the housing, which could otherwise compromise functional reliability. Furthermore, the combination of the trim strip and the radar sensor unit is designed to be comparatively robust. In this case, the trim strip stabilizes the housing, allowing the housing itself to be designed to be comparatively delicate, thus reducing weight and manufacturing costs. Alternatively, the housing can be glued to the trim strip, for example. This simplifies manufacturing, although stability is slightly reduced compared to encapsulation.

[0024] For example, the housing has the same orientation as the decorative strip or the flap body in the area where the decorative strip is connected. However, the housing is particularly preferably inclined with respect to the flap body, which the latter has in the area of ​​the decorative strip. In other words, the housing and the flap body form an angle with one another. In this case, it is possible for the flap body to have different orientations and, for example, to be curved. It is therefore possible for the housing and the flap body to be arranged parallel to one another, but at a distance from the decorative strip. Due to the inclination of the housing with respect to the flap body, there is improved monitoring of the vehicle's surroundings, and it is not necessary to coordinate the mounting location of the decorative strip with the housing and thus the radar sensor unit.Due to the inclined housing, the radar sensor unit's radiation and reception directions are adjustable and preferably aligned essentially horizontally, so that any so-called main lobe is essentially horizontal. Alternatively, the main lobe, i.e., the area of ​​increased radiation intensity / sensitivity, is tilted upwards relative to the horizontal, so that the decorative strip can also be installed in a relatively low area of ​​the flap body. Thus, the decorative strip can be used to prevent the flap body from colliding with a relatively low obstacle.

[0025] For example, the housing is made of a plastic and is, for example, an injection-molded part. In one embodiment, the thickness of the housing walls is the same everywhere. However, it is particularly preferred that the housing be formed from a film on the side facing away from the flap body. The thickness of this wall is thus comparatively small and less than 0.1 mm or 0.05 mm. Due to the comparatively small thickness, penetration by the radar waves is essentially unimpaired, which simplifies operation of the radar sensor unit. In this way, the extension of the radar sensor unit directed away from the flap body is also comparatively small, so that the thickness of the decorative strip, i.e. the projection of the decorative strip beyond the flap body, can be selected to be comparatively small. Consequently, air resistance is reduced on the one hand. And an attractive exterior is achieved on the other.However, the film prevents foreign particles from entering the housing before assembly, thus increasing safety. In particular, with the exception of the film, the housing is comparatively robust and is preferably made of plastic.

[0026] A circuit board, made of a glass-fiber-reinforced epoxy resin, is arranged in the housing. The circuit board stabilizes some, preferably any, electrical / electronic components of the radar sensor unit relative to each other, which increases robustness. In other words, the circuit board provides a circuit by means of which the function of the radar sensor unit is realized.

[0027] The radar sensor unit comprises a radar antenna that transmits and / or receives radar waves. For example, two radar antennas are provided, one for transmitting and the other for receiving radar waves. Alternatively, only a single radar antenna is provided, which is operated alternately for either receiving or transmitting radar waves. In a further alternative, multiple radar antennas are provided, at least some of which are used alternately for both transmitting and receiving radar waves.

[0028] The radar antenna is connected, specifically soldered, to the circuit board on the side opposite the flap body. This way, the circuit board itself does not interfere with the transmission / reception of radar waves, thus improving operation. It is also possible to appropriately direct the radar waves using the circuit board, specifically one or more of its tracks, to improve transmission.

[0029] The radar antenna is a component of a radar sensor chip, which thus has a circuit and is particularly designed as an integrated circuit. Thus, the radar sensor chip is located on the same side of the circuit board as the radar antenna, i.e., on the side opposite the flap body. Preferably, the antenna forms the end of the radar sensor chip opposite the circuit board. During operation, the radar sensor chip controls the radar antenna and / or evaluates the radar waves detected by the radar antenna. In other words, the radar antenna is designed as a so-called "antenna-on-package." Thus, the radar sensor chip essentially provides the main function of the radar sensor unit, which simplifies assembly. It is also possible to construct the radar sensor unit in a comparatively space-saving manner. Furthermore, the number of individual components is reduced, simplifying storage.The radar sensor chip is preferably mounted to the circuit board using surface mount technology (SMT) and, for example, features a so-called BGA ("ball grid array"). This further simplifies assembly.

[0030] For example, additional components are connected to the circuit board, preferably soldered. The additional components are in particular electrical and / or electronic components and serve to operate the radar sensor unit, for example, the power supply and / or communication. For example, the additional components are arranged on the same side of the circuit board as the radar sensor chips. This makes it possible to populate the circuit board only on one side, which simplifies manufacturing. Alternatively, the additional components are arranged randomly on both sides of the circuit board. This makes it possible to select a circuit board with comparatively small dimensions.

[0031] However, the additional components are particularly preferably arranged on the side of the circuit board facing the flap body. Thus, operation of the radar sensor chip and the radar antenna is not impaired by these additional components. On the radar antenna side, only additional components that are less tall than the radar sensor chip, i.e., have a smaller extension perpendicular to the circuit board than the radar sensor chip, are connected to the circuit board. Consequently, the radar sensor chip is the tallest component connected on this side of the circuit board. As a result, during operation, the radar waves transmitted and received by the radar sensor chip are essentially unaffected by the additional components, since they monitor an area directed away from the circuit board.Furthermore, the components are not affected by radar waves, so no absorber is required between them and the radar antenna to protect them from radar waves. This reduces space requirements and reduces manufacturing costs.

[0032] In the following, exemplary embodiments of the invention are explained in more detail with reference to a drawing. In the drawings: Fig. 1 schematically shows a motor vehicle with a flap having a flap body and a decorative strip, Fig. 2 in a sectional view the flap with the decorative strip, which accommodates a radar sensor unit, Fig. 3 in a sectional view the radar sensor unit, and Fig. 4 according to Fig. 3 an alternative embodiment of the radar sensor unit.

[0033] Corresponding parts are provided with the same reference numerals in all figures.

[0034] In Figure 1A simplified schematic representation of a motor vehicle 2 in the form of a passenger car (car) is shown. The motor vehicle 2 has a body 4, which is connected to four wheels 6 by means of a chassis (not shown in detail), two of which are shown. The wheels 6 make contact with a road surface (not shown in detail). The body 4 is made of metal and has several openings (not shown). The openings are each closed by a flap 8, which is movably mounted on the body 4 by means of corresponding bearings 10, here in the form of hinges. This makes it possible to pivot the respective flap 8 relative to the body 4 and thus to open or close the opening in the body 4. The flap 8 shown here is a side door of the motor vehicle 2.

[0035] The flap 8 comprises a flap body 12, which is pivotally attached to the body 4 by means of the bearing 10. In this case, the flap body 12 is made partly of metal and at least partly formed by a window pane (not shown in detail). A decorative strip 14 made of an elastic plastic is attached to the outside of the flap body 12 and detachably fastened there by clips. This allows the decorative strip 14 to be replaced. The decorative strip 14 and the flap body 12 are painted in the same color, so there is no color difference between them.

[0036] The decorative strip 14, which can also be designed as a door panel, serves to prevent the flap body 12 from contacting an obstacle, such as a post, when the flap body 12 is pivoted relative to the body 4 and the obstacle is located within the pivoting range of the flap body 12. Since the decorative strip 14 is made of a plastic, it is elastic, which means that no or only comparatively minor damage occurs. However, corrosion of the flap body 12 and thus subsequent damage are prevented.

[0037] As in the Figure 2As shown in a partial sectional view of the flap 8, the decorative strip 14 has a cup-shaped recess 16 directed towards the flap body 12. The recess 16 is not visible in the assembled state. A radar sensor unit 18 is accommodated within the recess 16, which has a housing 20 that represents the outer boundary of the radar sensor unit 18. The housing 20 is inclined relative to the flap body 12 in the region of the decorative strip 14. In other words, the housing 20 and the region of the flap body 12 to which the decorative strip 14 is attached form an angle that is different from 0° and in particular greater than 10°.

[0038] To stabilize the housing 20 in the recess 16, the recess is filled with a plastic potting compound 22 after the housing 20 has been inserted. Thus, the housing 20 is potted with the decorative strip 14, and the radar sensor unit 18 is received by the decorative strip 14. In an alternative, the housing 20 is clipped to the decorative strip 14. For this purpose, the recess 16 and the housing 20 have corresponding clips (not shown).

[0039] The radar sensor unit 18 is used to monitor the area around the motor vehicle 2 for any obstacles. During operation, the radar sensor unit 18 emits radar waves that are reflected and / or scattered by any obstacle. The radar waves deflected in this way partially rebound onto the radar sensor unit 18, allowing them to be detected by the radar sensor unit 18. The distance and / or position of the obstacle is determined based on the required propagation time and / or a change in the signal shape.

[0040] Here, radar waves are emitted into a monitored area 24 by means of the radar sensor unit 18, and radar waves can be received when they hit the radar sensor unit 18 from the monitored area 24. The main lobe 26, in which the maximum intensity of the emitted radar waves lies, is located in the center of the monitored area 24. Since the housing 20 is inclined with respect to the flap body 12 and the main lobe 26 is arranged perpendicular to the side of the essentially rectangular housing 20 facing away from the flap body 12, the main lobe 26 is tilted vertically upward with respect to a horizontal 24, so that not only the ground around the motor vehicle 2 is monitored by the radar sensor unit 18.In the variant shown here, the area 26 monitored by the radar sensor unit 18 has a solid angle of more than 90°, wherein the main lobe 26 forms an angle of substantially 10° with respect to the horizontal 24.

[0041] In Figure 3A first variant of the radar sensor unit 18 is shown in cross-section. The housing 20 has a shell-shaped base body 30 made of a plastic. The base body 30 is covered on the remaining side by a film 32, so that this side of the housing 20 is formed by the film 32. In the assembled state, the housing 20 is positioned such that the film 32 is located on the side facing away from the flap body 12. The film 32 is aligned perpendicular to the main lobe 26. Thus, during operation, the radar waves emitted by the radar sensor unit 18 do not pass through the base body 30, but only through the film 32, so that there is essentially no attenuation or interaction of the housing 20 with the radar waves.

[0042] Due to the film 32, the outer dimensions of the housing 20 are comparatively small, while still preventing particles from penetrating the housing 20 prior to installation in the trim strip 14. Once the housing 20 is installed in the recess 16, it is subsequently sealed using the potting compound 22, so that the components of the radar sensor unit 18 arranged in the housing 20 are also protected from excessive mechanical stress.

[0043] Arranged within the housing 20 is a circuit board 34 made of a glass-fiber-reinforced epoxy resin. The circuit board 34 is arranged parallel to the film 32, and on the side of the circuit board facing the film 32, a radar sensor chip 36 is mounted. The housing is a BGA ("Ball Grid Array"). The radar sensor chip 36 comprises an integrated circuit 38 and a radar antenna 40, with the integrated circuit 38 located between the radar antenna 40 and the circuit board 34. The integrated circuit 40 serves to control the radar antenna 40 so that the radar waves are emitted. The radar waves detected by the radar antenna 40 are also evaluated by the integrated circuit 38. In a preferred embodiment, the integrated circuit 38 also performs an evaluation of the received radar waves, so that the position and / or distance of any obstacle can be determined by means of these.

[0044] In summary, the radar antenna 40 is a component of the radar sensor chip 36, and the radar antenna 36 is arranged on the side of the circuit board 34 opposite the flap body 12. In particular, an absorber (not shown in detail) is arranged between the integrated circuit 38 and the radar antenna 40, or the radar antenna 40 is designed such that no or only a comparatively small amount of the radar waves emitted by the radar antenna 40 penetrates the integrated circuit 38. This increases operational reliability.

[0045] Further electrical and / or electronic components 42 are connected to the circuit board 34. The components 42 are, for example, capacitors, resistors, or chips. On the side of the radar sensor chip 36, only those components 42 are located that have a lower height than the radar sensor chip 30, i.e., whose maximum distance from the circuit board 34 is less than the distance between the radar antenna 40 and the circuit board 34. Thus, these (further) components 42 are not irradiated by the radar waves emitted by the radar antenna 40, which is why no absorber is required between them and the radar sensor chip 36 to ensure the functional reliability of the components 42. As a result, the weight and size of the radar sensor unit 18 are reduced.

[0046] The components 42, which have a greater height, are located on the side opposite the radar sensor chip 36, i.e., on the side facing the flap body 12. A U-shaped heat sink 46, made of metal, is also bonded to this side via a thermally conductive paste 44. The base body 32 has a pedestal 48 on the inside, on which the heat sink 46 rests. By means of this pedestal, the heat sink 46 is pressed against the circuit board 34, thus ensuring secure thermal contact.

[0047] In Figure 4A modification of the radar sensor unit 18 is shown. Here, the housing 20 with the base body 30 and the film 32, as well as the pedestal 48, remains unchanged. The circuit board 34, which is arranged parallel to the film 32, is also present. However, instead of the radar sensor chip 36, the radar antenna 40 is created using a separate component, such as a conductor track of the circuit board 34. The radar antenna 40 is again located on the side of the circuit board 34 facing the film 32 and thus facing away from the flap body 12.

[0048] The radar antenna 40 is operated by means of a control chip 50, which again has a BGA design and performs the same tasks as the integrated circuit 38 from the previous embodiment. However, the control chip 50 and the radar antenna 40 are structurally separate from one another, and the control chip 50 is located on the side of the circuit board 34 facing the flap body 12, so that the circuit board 34 is arranged between the radar antenna 40 and the control chip 50. The radar antenna 40 and the control chip 50 are signal- and electrically connected to one another by means of a via 52. The projections of the radar antenna 40 and the control chip 50 onto the circuit board overlap one another, so that the signal connection between them is comparatively short.

[0049] The control chip 50 is thermally connected to the heat sink 46 via the thermal paste 44, which in turn is stabilized by the pedestal 48. The radar sensor unit 18, in turn, has the additional components 42, with all components 42 located on the side of the control chip 50 relative to the circuit board 34. Thus, any influence on the circuit board by the radar waves is essentially eliminated or at least reduced by the circuit board 34.

[0050] The invention is not limited to the embodiments described above. Rather, other variants of the invention may be derived therefrom by those skilled in the art without departing from the scope of the invention. The scope of the invention is determined by the claims. List of reference symbols

[0051] 2Motor vehicle 4Body 6Wheel 8Flap 10Mounting 12Flap body 14Trim 16Recess 18Radar sensor unit 20Housing 22Potting compound 24Monitored area 26Main lobe 28Horizontal 30Base body 32Foil 34Printed circuit board 36Radar sensor chip 38Integrated circuit 40Radar antenna 42Component 44Thermal paste 46Heat sink 48Pedestal 50Control chip 52Through-hole plating

Claims

1. Flap (8) of a motor vehicle (2), having a flap body (12) to which a trim strip (14) is attached at the outer side, wherein a radar-sensor unit (18) with a housing (20) is accommodated by the trim strip (14), wherein a printed circuit board (34) is arranged in the housing (20), wherein a radar antenna (40) is attached to that side of the printed circuit board (34) which is situated opposite the flap body (12), and wherein the radar antenna (40) is a constituent part of a radar-sensor chip (36), characterized in that, on the side of the radar antenna (40), only components (42) having a smaller height than the radar-sensor chip (36) are attached to the printed circuit board (34).

2. Flap (8) according to Claim 1, characterized in that the housing (20) is clipped to the trim strip (14).

3. Flap (8) according to Claim 1, characterized in that the housing (20) is moulded to the trim strip (14).

4. Flap (8) according to one of Claims 1 to 3, characterized in that the housing (20) is inclined in the region of the trim strip (14) in relation to the flap body (12).

5. Flap (8) according to one of Claims 1 to 4, characterized in that, on the side facing away from the flap body (12), the housing (20) is formed by means of a film (32).