Head-up display device for a motor vehicle and method for manufacturing a head-up display device

Description

[0001] The invention relates to a head-up display device for a motor vehicle, comprising a housing part in which an image generation unit of the display device is arranged. The image generation unit is designed to project an image onto a translucent projection surface. A cover element is connected to the housing part, wherein the cover element partially covers the housing part toward the surroundings of the display device. The cover element has a pin element, which is inserted into a corresponding receptacle formed in the housing part. Furthermore, the invention relates to a method for manufacturing such a head-up display device.

[0002] DE 10 2007 010 381 B4 describes a head-up display for a motor vehicle for installation in the area of ​​a dashboard of the motor vehicle. The head-up display comprises a first, lower housing part and a second, upper housing part. A mirror optic with two mirrors and control electronics are arranged in the lower housing part. A cover plate is arranged on the upper housing part, which closes off the head-up display at the top and serves, among other things, to protect the display from dust. The two housing parts are detachably connected to one another, for which purpose fastening means are provided. The fastening means can comprise locking pins on one housing part, which engage in corresponding locking receptacles on the other housing part.

[0003] DE 10 2018 120926 A1 describes a head-up display for a motor vehicle, comprising a cover device and a housing device. The cover device and the housing device are connected by a connecting device. The connecting device has a sleeve element arranged between a fastening element and a damping element that serves to dampen vibrations.

[0004] The object of the present invention is to provide a head-up display device of the type mentioned at the outset, in which a particularly secure positioning of the cover element on the housing part is achieved, and to provide a method for manufacturing such a head-up display device.

[0005] This object is achieved by a head-up display device having the features of patent claim 1 and by a method having the features of patent claim 12. Advantageous embodiments with expedient further developments of the invention are specified in the dependent patent claims and in the following description.

[0006] The head-up display device according to the invention for a motor vehicle comprises a housing part in which an image generation unit of the display device is arranged. The image generation unit is designed to project an image onto a translucent projection surface. The display device comprises a cover element which is connected to the housing part. The cover element partially covers the housing part towards the surroundings of the display device. The cover element has a pin element which is inserted into a corresponding receptacle formed in the housing part. The pin element is widened by means of an expansion body inserted into the pin element, wherein the pin element is fixed in the receptacle due to the widening.

[0007] During manufacture of the display device or during assembly of the display device or head-up display device, the pin element can initially be inserted into the receptacle with sufficient play and thus very easily. The subsequent insertion of the expansion body into the pin element, which is designed like an expansion dowel, then causes the pin element to expand. In other words, the pin element is widened or spread open by means of the expansion body in a similar way to screwing a screw into a dowel. This widening of the pin element or this spreading apart of at least two partial areas of the pin element in turn ensures the firm and resilient fixation of the pin element in the receptacle. The pin element fixed in the receptacle is therefore secured against loosening or moving out of the receptacle.Consequently, the cover element is positioned very securely and precisely on the housing part.

[0008] This is particularly advantageous in that the cover element provides a dust- and / or drip-proof cover for the housing part. Furthermore, such a connection of the cover element to the housing part, in which the expansion body is inserted into the pin element, can be implemented with minimal technical effort and at the same time with process reliability.

[0009] The pin element, which is particularly designed as a dowel-like feature of the cover element, thus preferably functions both as an expandable dowel and as a centering pin or positioning pin. This is advantageous with regard to the precise positioning of the cover element on the housing part.

[0010] The positioning and fixation of the cover element to the housing part achieved by means of the expanded or spread pin element can also be implemented very cost-effectively. Both the expansion body and the pin element itself can be provided and manufactured very cost-effectively.

[0011] In the head-up display device, which for the sake of simplicity is also referred to synonymously as a display device, the image generation unit can project the image onto a translucent projection surface in the form of a windshield of the motor vehicle during operation. Furthermore, it is possible to use the image generation unit or image output device of the display device to project the image onto a translucent and image-reflecting disc, designed as a so-called combiner, which is designed as a separate component from the windshield or front window of the motor vehicle.

[0012] To secure the pin element in the receptacle, the pin element, which is expanded or spread by the expansion body, can form a positive connection with the housing part in the region of the receptacle. For this purpose, at least one projecting region of the expanded pin element can engage behind a material region of the housing part in which the receptacle is formed.

[0013] Preferably, the pin element is clamped to a wall defining the receptacle due to the expansion. A force-locking connection is created between the wall defining the receptacle, provided by the housing part, and an outer side of the pin element, resulting from the pressing of the pin element against the wall. This allows for a particularly secure and precise, particularly play-free, and also highly process-reliable fixation of the pin element in the receptacle. In this way, manufacturing tolerances on the pin element side and / or on the receptacle side can be easily and effectively compensated.

[0014] In particular, if the pin element is fixed in the receptacle with at least a largely play-free effect as a result of the expansion, a very good centering of the pin element in the receptacle can be achieved.

[0015] The receptacle in the housing part can be provided particularly easily if the receptacle is designed as a bore. In particular, such a bore can be designed as a through-opening in a corresponding sub-area or material area of ​​the housing part.

[0016] Preferably, the cover element is connected to the housing part by means of at least one additional fastening means, different from the pin element. This ensures a particularly secure connection between the cover element and the housing part.

[0017] The at least one fastening means can be guided through a through-opening formed in the housing part and secured to another component of the display device. Then, as in a sandwich construction, the cover element serving as a cover is connected to the other component through the housing part. This, in turn, advantageously ensures very precise positioning of the other component of the display device, particularly relative to the housing part.

[0018] Preferably, the additional component has at least one fastening dome into which the additional fastening means is inserted. By means of the at least one fastening dome, precise positioning of the additional component on the housing part can be achieved. Furthermore, the fastening dome advantageously provides a material region of the additional component into which the additional fastening means can be easily inserted.

[0019] Preferably, the additional component is made of a different material than the housing part. This allows the material properties to meet the respective requirements placed on the additional component and the housing part.

[0020] For example, the additional component can advantageously be made of a cost-effective plastic. In contrast, the housing part can be made of metal. This imparts a high degree of robustness to the housing part. This is particularly advantageous with regard to the attachment of a control device of the head-up display device, preferably provided and designed to control the image generation unit, to the housing part and / or with regard to the protected accommodation of the image generation unit in the housing part.

[0021] These advantages are particularly evident when the housing part is formed as a die-cast metal part. Furthermore, this method allows for particularly precise manufacturing of the housing part.

[0022] Preferably, the additional component is designed as a shielding device, by means of which the exposure of at least one component of the image generation unit to stray light can be at least reduced. In this way, the additional component not only connects or couples the cover element to the housing part. Rather, the additional component also advantageously ensures that the output of images by means of the image generation unit or image output device is impaired as little as possible.

[0023] This is because the additional component designed as a shielding device can, on the one hand, at least reduce or prevent as far as possible the incidence of scattered light in the form of sunlight or ambient light on components of the image generation unit.

[0024] Furthermore, the shielding device can largely prevent unwanted reflection of light used to project the image onto the translucent projection surfaces. This is also advantageous.

[0025] For example, the shielding device can be provided on its side facing the corresponding components of the image generation unit with a coating or the like that prevents light reflection as much as possible. Accordingly, such a coating on the shielding device can be matte or non-reflective, for example.

[0026] The expansion body is preferably designed as a screw. This allows for a very precisely controlled expansion of the pin element in the receptacle by progressively screwing the expansion body further into the pin element. Furthermore, an expansion body designed as a screw is very easy to handle, namely using a screwing tool.

[0027] It has proven further advantageous if the at least one additional fastening element is designed as a screw. This allows the screwing tool to be used to insert the expansion body into the pin element as well as to screw in the at least one additional fastening element. This is advantageous with regard to low-effort and simple assembly or production of the display device.

[0028] Preferably, the screw providing the expansion body and / or the at least one additional fastening means is made of a plastic. Such screws are particularly cost-effective compared to screws made of metal, for example.

[0029] It is also advantageous if the plastic screws are self-tapping. This eliminates the need for a laborious, precisely machined thread on the respective counterpart into which the self-tapping plastic screw is inserted. Instead, the self-tapping screw forms its own thread as it is inserted into the respective counterpart. This is also advantageous in terms of reducing the effort required for the production or assembly of the display device.

[0030] It is advantageous if screws of the same design, particularly self-tapping plastic screws of the same design, are used for both the expansion body and the at least one additional fastening means. This eliminates the need to consider which of these screws should be used as the expansion body to expand the pin element and which of these screws should be used as the at least one additional fastening means. This is also advantageous with regard to simple and rapid assembly or production of the display device.

[0031] In particular, the use of self-tapping plastic screws for both the expansion body and the at least one further fastening means is advantageous in terms of process reliability and costs.

[0032] Preferably, the pin element and the at least one additional fastening means are arranged in respective corner regions of the cover element. This ensures that both the pin element and the additional fastening means are easily accessible.

[0033] It has also proven advantageous if the pin element is formed integrally with a base body of the cover element. This allows for the pin element to be provided with particularly little effort. For example, the cover element can be made of a plastic and have the pin element formed from this plastic.

[0034] Preferably, a recess is formed in a side wall of the cover element, through which an electrical connection device of the display device is accessible from the surroundings of the display device. In this way, components of the display device, in particular a control device of the display device and / or the image generation unit designed to control the image generation unit, can be easily supplied with electrical energy, for example by inserting a connector plug or similar plug element into the electrical connection device of the display device.

[0035] In addition, the recess formed in the cover element provides an anti-twist lock for attaching the cover element to the housing part. Particularly in conjunction with the pin element that is inserted into the receptacle, this allows for very precise alignment of the cover element to the housing part during the manufacture or assembly of the display device.

[0036] Preferably, the side wall is sealed in the area of ​​the recess relative to the electrical connection device by means of a sealing element. This ensures that, despite the provision of the recess in the cover element, no contaminants, such as dust and / or water, in particular dripping water, can enter the housing part via the recess.

[0037] Preferably, the side wall has a retaining groove in the area of ​​the recess, which partially surrounds the sealing element. This also ensures precise positioning of the sealing element.

[0038] In particular, the sealing element can be formed from an elastic foam material. By means of such a foam collar, which partially encompasses or partially encircles the electrical connection device, it is possible to ensure a very simple yet effective sealing of the interior of the display device from the surroundings of the display device.

[0039] In the method according to the invention for manufacturing a head-up display device for a motor vehicle, a housing part of the display device is connected to a cover element of the display device. An image generation unit of the display device is arranged in the housing part. The image generation unit is designed to project an image onto a translucent projection surface. The cover element partially covers the housing part towards the surroundings of the display device and has a pin element. The pin element is inserted into a corresponding receptacle formed in the housing part. The pin element is then expanded by means of an expansion body inserted into the pin element, wherein the pin element is fixed in the receptacle due to the expansion.

[0040] By securing the pin element in the receptacle, the pin element is held securely in position. This ensures particularly secure and precise positioning of the cover element on the housing part.

[0041] The advantages and preferred embodiments described for the display device according to the invention also apply to the method according to the invention and vice versa.

[0042] 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, can be used not only in the respective combination specified, but also in other combinations without departing from the scope of the invention. Thus, embodiments are also to be considered encompassed and disclosed by the invention that are not explicitly shown and explained in the figures, but which emerge and can be produced by separate feature combinations from the explained embodiments. Embodiments and feature combinations are also to be considered disclosed that therefore do not have all the features of an originally formulated independent claim.Furthermore, embodiments and combinations of features are to be regarded as disclosed, in particular by the embodiments set out above, which go beyond or deviate from the combinations of features set out in the reliances of the claims.

[0043] Further features of the invention emerge from the claims, the figures, and the description of the figures. These show: Fig. 1 is a perspective view of a display device designed as a head-up display for a motor vehicle, wherein the display device is shown in its installed position in the motor vehicle; Fig. 2 is a further perspective view of the display device according to Fig. 1 , wherein a cover element attached to an underside of the display device is more circumferential than in Fig. 1 can be seen; Fig. 3 an exploded view of components of the display device or the head-up display in perspective according to Fig. 2 ; Fig. 4 in an enlarged perspective view a further exploded view of individual components of the display device; Fig. 5 in an enlarged detailed view a section of a housing part of the display device designed as a die-cast housing; Fig. 6 the cover element of the display device in a perspective view of an inner side, wherein the inner side in the assembled state of the cover element (compare Fig. 2 ) facing the die-cast housing; Fig. 7 shows a further perspective view of the display device; Fig. 8 shows a partially sectioned view of the display device, wherein the cover element is fixed to the die-cast housing; and Fig. 9 shows an enlarged detailed view of a sealing element designed in the manner of a foam collar, by means of which an electrical connection device of the display device is sealed.

[0044] In the figures, identical or functionally equivalent elements are provided with identical reference symbols.

[0045] Fig. 1 shows a perspective view of a display device 10 for a motor vehicle designed as a head-up display (and thus as a "head-up display"), which is referred to here either as a head-up display device 10 or (for reasons of simplicity) simply as a display device 10. The display device 10 is in Fig. 1 shown in its installed position in the motor vehicle. Accordingly, an image can be projected onto a windshield or windscreen of the motor vehicle (not shown) through a top-side, transparent cover 12, which can be designed as a transparent film or the like. The contents of the image are thus visible in the field of vision of a driver of the motor vehicle looking through the windshield.

[0046] An image generation unit 14 of the display device 10 designed to provide and project the image is shown in Fig. 2 schematically, whereby the image generation unit 14 is not realistically represented either with regard to its arrangement in a housing part 16 of the display device, which is here designed as a die-cast housing, or with regard to the associated components. Fig. 1 However, for example, a mirror 18 of the image generation unit 14 can be seen. Via this mirror 18, the image is projected through the transparent cover 12 onto the windshield or front window of the motor vehicle (not shown).

[0047] A control device 20 (see Fig. 3 ) for controlling the image generation unit 14 is provided by electronic components not specified in more detail here, which are arranged on a printed circuit board 22 in the embodiment of the display device 10 shown in the figures. The printed circuit board 22 (and thus also the control device 20) is arranged or held on the housing part 16, which is designed as a metallic die-cast housing (see Fig. 3 ).

[0048] In order to protect the electronic components arranged on the circuit board 22 from exposure to dust and dripping water, a cover element 24 is attached to the housing part 16 designed as the die-cast housing. As can be seen in particular from Fig. 1 combined with Fig. 2 As can be seen, the cover element 24 covers the housing part 16 in the installed position of the display device 10 (see Fig. 1 ) on the underside towards an area surrounding the display device 10.

[0049] The manner in which the cover element 24 or cover is fixed to the housing part 16, in the present case in the form of the metallic die-cast housing, will be explained in more detail below.

[0050] In the present case, a plurality of screws 26 (see Fig. 3 ), which are preferably designed as self-tapping plastic screws. A part of the screws 26 is screwed through the cover element 24 and the housing part 16 into a further component 28, which in the exploded view is shown in Fig. 3 shown in perspective. This further component 28 is designed in the present case as an optical chamber or shielding device, the purpose of which is, in particular, to prevent the incidence of disruptive scattered light on components of the image generation unit 14 as far as possible.

[0051] In the Fig. 1 und Fig. 2 In the perspective view of the display device 10 shown, this further component 28 is partially covered by the (in Fig. 1 lower) housing part 16 and partially by a Fig. 1 upper housing part 30 of the display device 10 is covered, wherein the transparent cover 12 is arranged on the upper housing part 30 (see Fig. 1 ).

[0052] Not only the cover element 24, but also the upper housing part 30 is connected to the housing part 16, which is here designed as a die-cast housing. In particular, the upper housing part 30 can be screwed to the die-cast housing or secured to the die-cast housing in another suitable manner, whereby the method of securing does not need to be explained in detail here.

[0053] According to the Fig. 3 As can be seen from the structure of the display device 10, the housing part 16 designed as a die-cast housing is arranged like a sandwich between the further component 28 in the form of the optical chamber and the cover element 24.

[0054] The further component 28 is made of plastic. Furthermore, fastening domes 32 are formed on the further component 28, wherein in the Fig. 3 In the exemplary embodiment of the display device 10, three such fastening domes 32 are provided by the further component 28. Three of the fastening domes 32 are also Fig. 3 shown screws 26 are inserted when the screws 26 connect the cover element 24 serving as a cover through the housing part 16 with the underlying plastic part in the form of the further component 28 (see Fig. 2 ).

[0055] From a summary in particular of Fig. 4 with Fig. 6 It can be seen that in the cover element 24, respective through-openings 34 are formed for these three screws 26, which are arranged in respective corner regions of the cover element 24. According to Fig. 5 und Fig. 6 These through-openings 34 formed in the cover element 24 are aligned with further through-openings 36 which are formed in the housing part 16 provided in this case by the die-cast housing.

[0056] In a corner area 38 of the further component 28 (compare Fig. 3 ), however, the further component 28 is too far away from the cover element 24 to allow a connection of the cover element 24 to the further component 28 by means of the Fig. 3 shown fourth screw 26. As can be seen particularly from a summary of Fig. 4 with Fig. 6 As can be seen, the cover element 24 has a pin element 40 in this corner region 38 instead of the through openings 34.

[0057] The pin element 40, which is designed in the manner of a dowel or expansion dowel, is introduced into a receptacle 42, which is designed as a bore, in the housing part 16 during the manufacture of the display device 10, specifically during the assembly of the cover element 24 to the housing part 16 (see in particular Fig. 5 ).

[0058] After the pin element 40 has been inserted with play into the receptacle 42, which in the exemplary embodiment is designed as a bore, the fourth screw 26 is screwed into the pin element 40 from an outer side of the cover element 24 facing the surroundings of the display device 10. In contrast, in Fig. 6 the cover element 24 is shown in a view of its inside, wherein the inside of the cover element 24 in the assembled state of the display device 10 (see Fig. 1 ) faces the housing part 16.

[0059] The (fourth) screw 26 acts as an expansion body when screwed into the pin element 40 and leads to an expansion of the pin element 40. In particular, two partial areas of the pin element 40, which are separated from each other at least in part by a slot, are moved away from each other. This in turn causes the pin element 40 to be clamped to a wall 44, which delimits the receptacle 42 in the circumferential direction (see Fig. 5 ). In Fig. 6 It can be seen that in the not yet spread state of the pin element 40, the partial areas or parts of the pin element 40 can still be connected to one another at a free end 56 of the pin element 40.

[0060] Due to the expansion of the pin element 40, the pin element 40 is fixed in the receptacle 42 in the present case. Preferably, the pin element 40 is received in the receptacle 42 without play due to the insertion of the screw 26, which acts as an expansion body, into the pin element 40.

[0061] Advantageously, the screws 26, which are designed as identical parts in the present case, can be used in the form of self-tapping plastic screws for cost-effectively fixing the cover element 24 serving as a cover to the housing part 16. To secure the cover element 24 to the housing part 16 or to connect the cover element 24 to the housing part 16, some of the screws 26, in this case three, are screwed through the housing part 16 or die-cast housing into the optical chamber in the form of the further component 28. And the fourth screw 26, in this case, is used as the expansion body.

[0062] Furthermore, the pin element 40 provides a precise geometry for aligning the cover element 24 relative to the die-cast housing or housing part 16. The pin element 40 therefore serves as a centering pin and simultaneously as a dowel or expansion dowel for precise positioning and fixing of the cover element 24 to the housing part 16.

[0063] Preferably, during the manufacture of the display device 10 or during the assembly of the display device 10, the pin element 40 is first inserted into the receptacle 42 with a clearance fit. When the screw 26 serving as an expansion body is then inserted or screwed into the pin element 40 from the surroundings of the display device 10, the resulting widening of the pin element 40 leads to a centering of the pin element 40 in the receptacle 42, preferably without clearance. Subsequently, the further screws 26 are screwed into the associated fastening domes 32, which are provided on the further component 28 (cf. Fig. 3 ).

[0064] Out of Fig. 1 It can be seen that in the mounted state of the display device 10, a plug 46 of the display device 10 serving as an electrical connection device is accessible from the surroundings of the display device 10.

[0065] As can be seen particularly from a review of Fig. 1 with Fig. 6 As can be seen, this plug 46 is located in the region of a U-shaped recess 48 formed in a side wall 50 of the presently hood-shaped cover element 24. By arranging the plug 46 in the region of this recess 48 during assembly of the cover element 24, a rotationally secure alignment of the cover element 24 with respect to the housing part 16 is ensured when the pin element 40 is inserted or introduced into the receptacle 42.

[0066] In Fig. 7 The display device 10 is shown in a further view of its underside, where the cover element 24 is connected to the housing part 16. Here, both the screw 26 can be seen, which was screwed in to widen the pin element 40 in the area of ​​the receptacle 42, as well as the other three screws 26, which are screwed into the fastening domes 32 of the further component 28 (see Fig. 3 ) are screwed in.

[0067] From the Fig. 8 In the partially sectioned illustration of the cover element 24 with the printed circuit board 22 located underneath, the arrangement of the cover element 24 relative to the connector 46, which is arranged on the printed circuit board 22, can be clearly seen. Accordingly, a retaining groove 52 is formed on the cover element 24 in the region of the recess 48, which partially surrounds a sealing element 54. In other words, the sealing element 54 is partially received in the retaining groove 52, which is formed integrally with the side wall 50 of the cover element 24 (cf. Fig. 6 ).

[0068] In Fig. 9The sealing element 54 is shown in perspective, encompassing the plug 46 in a U-shape. For example, the sealing element 54 can be formed in the manner of a foam collar made of an elastic foam material. In this way, dust-tightness of the display device 10, which is designed here as a head-up display, is ensured, in particular, even in the area of ​​the plug 46 when the cover element 24 is connected to the housing part 16.

Claims

1. Head-up display device (10) for a motor vehicle, having a housing part (16), in which an image-generating unit (14) of the display device (10) is arranged, wherein the image-generating unit (14) is designed to project an image onto a light-permeable projection surface, and having a cover element (24), which is connected to the housing part (16) and covers regions of the housing part (16) with respect to the surroundings of the display device (10), wherein the cover element (24) has a peg element (40), which is inserted into a corresponding receptacle (42) formed in the housing part (16), characterized in that the peg element (40) is expanded by means of a spreading piece (26) inserted into the peg element (40), wherein the peg element (40) is fixed in the receptacle (42) as a result of the expansion.

2. Head-up display device according to Claim 1, characterized in that as a result of the expansion, the peg element (40) is braced against a wall (44) that delimits the receptacle (42), which is in particular designed as a drilled hole.

3. Head-up display device according to Claim 1 or 2, characterized in that the cover element (24) is connected to the housing part (16) by means of at least one further fastening means (26), which is different from the peg element (40).

4. Head-up display device according to Claim 3, characterized in that the at least one further fastening means (26) is fed through a through-opening (36) formed in the housing part (16) and is fixed to a further component part (28) of the display device (10).

5. Head-up display device according to Claim 4, characterized in that the further component part (28) has at least one fastening dome (32), into which the further fastening means (26) is inserted.

6. Head-up display device according to Claim 4 or 5, characterized in that the further component part (28) is formed from a different material, in particular a plastic, than the housing part (16), which is in particular formed from metal.

7. Head-up display device according to one of Claims 4 to 6, characterized in that the further component part (28) is designed as a shielding device, by means of which an exposure of at least one component of the image-generating unit (14) to scattered light can be at least reduced.

8. Head-up display device according to one of Claims 3 to 7, characterized in that the spreading piece and / or the at least one further fastening means is designed as a screw (26), in particular as a screw (26) that is formed from a plastic and / or is self-cutting.

9. Head-up display device according to one of Claims 3 to 8, characterized in that the peg element (40), which is in particular formed integrally with a main body of the cover element (24), and the at least one further fastening means (26) are arranged in respective corner regions of the cover element (24).

10. Head-up display device according to one of Claims 1 to 9, characterized in that a cut-out (48) is formed in a side wall (50) of the cover element (24), via which cut-out an electrical connection device (46) of the display device (10) is accessible from the surroundings of the display device (10), wherein the side wall (50) is sealed off from the electrical connection device (46) in the region of the cut-out (48) by means of a sealing element (54).

11. Head-up display device according to Claim 10, characterized in that the side wall (50) has, in the region of the cut-out (48), a retaining groove (52), which fits around regions of the sealing element (54), which is in particular formed from an elastic foam material.

12. Method for producing a head-up display device (10) for a motor vehicle, in which method a housing part (16), in which an image-generating unit (14) of the display device (10) is arranged, the image-generating unit being designed to project an image onto a light-permeable projection surface, is connected to a cover element (24) of the display device (10), the cover element covering regions of the housing part (16) with respect to the surroundings of the display device (10), wherein the cover element (24) has a peg element (40), which is inserted into a corresponding receptacle (42) formed in the housing part (16), characterized in that the peg element (40) is expanded by means of a spreading piece (26) inserted into the peg element (40), wherein the peg element (40) is fixed in the receptacle (42) as a result of the expansion.