Multi-part plastic tub with specific connection region, and household appliance and method for producing a tub

Abstract

One aspect of the invention relates to a tub (5) for a household appliance (1) for washing laundry, comprising a first annular container part (24) made of plastic and a separate second annular container part (25) made of plastic, which is arranged behind the first container part (25) in the direction of a longitudinal axis (A) of the tub (1), wherein the two container parts (24, 25) are firmly connected to one another at a connecting region (26), characterized in that a rear edge region (30) of the first container part (24) is shaped inwardly in the radial direction to the longitudinal axis (A), and a coupling structure (33) is formed on this radially tapered rear edge region (30), which extends laterally outward, and a front edge region (31) of the second container part (25) is shaped inwardly in the radial direction to the longitudinal axis (A).and on this radially tapered front edge region (31) a counter-coupling structure (34) is formed, which extends laterally outwards and is firmly connected to the coupling structure (33).

Description

[0001] One aspect of the invention relates to a suds container for a household appliance for washing laundry. The suds container has a first annular container part made of plastic. In addition, the suds container has a second annular container part that is separate from the first annular container part and is also made of plastic. In the direction of a longitudinal axis of the suds container, the second container part is arranged behind the first container part. The first container part is therefore closer to a loading opening of the suds container than the second container part, viewed in the direction of this longitudinal axis. The two container parts are firmly connected to one another at a connecting region.

[0002] Another aspect of the invention relates to a household appliance for washing laundry with such a tub. Another aspect of the invention relates to a method for producing a tub.

[0003] A multi-part plastic tub is known from EP 0 043 429 A1. The connecting area between the individual parts of the tub is relatively large in this regard and thus protrudes far outwards laterally in the radial direction to the longitudinal axis of the tub. Since a tub, just like a laundry drum, is part of an oscillating system of a household appliance for washing laundry, a relative movement of this tub and the laundry drum occurs during operation of the household appliance relative to a housing of the household appliance in which this system is arranged. To prevent the tub from striking the walls of this housing during this relative movement, it is necessary to set an appropriate horizontal distance which ensures that the tub does not strike a wall, for example a side wall, of the housing even during operation of the household appliance.

[0004] This requirement and the desire to be able to care for more laundry per care cycle with existing and, in particular, standardized external dimensions of a household appliance requires appropriate design.

[0005] In order to save energy during laundry care, it is desirable to be able to care for more laundry per care process.

[0006] It is an object of the present invention to provide a tub and a household appliance and a method for producing a tub, in which a low-wear operation of the household appliance is possible, in particular with regard to the tub and a housing of the household appliance, and in particular also to be able to care for more laundry per laundry care process.

[0007] This object is achieved by a lye container, a household appliance and a method according to the independent claims.

[0008] One aspect of the invention relates to a suds container for a household appliance for washing laundry. The suds container has a first annular container part made of plastic. In addition, the suds container has a second annular container part that is separate from the first annular container part and is also made of plastic. In the direction of a longitudinal axis of the suds container, the second container part is arranged behind the first container part. The first container part is therefore closer to a loading opening of the suds container than the second container part, viewed in the direction of this longitudinal axis. The two container parts are firmly connected to one another at a connecting region.

[0009] A rear edge region of the first and therefore front container part, viewed in the direction of the longitudinal axis of the lye container, is shaped inwards in the radial direction to this longitudinal axis. A coupling structure for coupling or connecting to the other container part is formed on this rear edge region. This coupling structure is therefore intended to be located and constructed in such a way as to be able to form a direct connection with the other container part. This coupling structure extends laterally outwards from the edge region in the radial direction. Furthermore, a front edge region of the second, rear container part, viewed in the direction of the longitudinal axis, is shaped inwards in the radial direction to the longitudinal axis. A counter-coupling structure is formed on this radially tapered front edge region. This is intended to be coupled to the coupling structure.The counter-coupling structure extends laterally outwards from this tapered front edge region. It is firmly connected to the coupling structure. The rear edge region of the first container part and the front edge region of the second container part are arranged facing one another, in particular adjacent to one another. The container parts are mechanically connected by the coupling structure and the counter-coupling structure. Such a concept therefore provides a lye container which only locally has a specifically designed connecting region. Viewed from the connecting region to other parts of the container parts, this connecting region is therefore offset radially inwards. Thus, particularly when viewed inversely, it is provided that container regions of the container parts which adjoin the connecting region axially to the front and rear protrude radially further outwards than this rear edge region and the front edge region.This also means that the lye container is designed to be volume-expanded, since the container areas of the container parts adjoining the connecting area are virtually moved radially outwards and thus the volume of the lye container is increased.

[0010] The proposed concept of the tub makes it possible, on the one hand, to maintain the aforementioned distance, particularly from the inside of the side walls of a household appliance when installed in the housing. This also ensures that, during operation of the household appliance and when the tub moves relative to the side walls, it is prevented from striking these side walls. On the other hand, the tub is larger in volume, particularly compared to conventional tubs, so that a larger laundry drum can be accommodated in the tub.

[0011] This also makes it possible to increase the volume of the suds container and yet still enable low-wear, and in particular wear-free, operation of the household appliance with such a suds container.

[0012] In particular, the clear width of the tub at a radially innermost point of the connection area is between 535 mm and 540 mm.

[0013] Preferably, a clear width, in particular an inner diameter, of the lye container in a container region of the container parts which lies outside the connecting region is between 554 mm and 560 mm.

[0014] Such a tub also allows for more extensive and improved utilization of the available space in the appliance's housing. Furthermore, such a concept also makes it possible to reduce the number of dampers in the appliance's vibration system. In particular, such a damper system can be reduced in size, so that, for example, only three are required instead of four. This also improves the dynamic behavior of this vibration system and enables a reduction in noise and energy consumption of the appliance.

[0015] In one embodiment, the rear edge region is continuously curved inward. In particular, this rear edge region thus has a conical shape in cross-section.

[0016] It is also possible for the front edge region to be continuously curved inward. In one embodiment, this can also be conically shaped. When the container parts are assembled, these two edge regions form a trough in which the coupling structure and the counter-coupling structure are accommodated. This trough shape allows the coupling structure arranged at the edge regions and the counter-coupling structure to be partially recessed into this trough. Last but not least, the coupling structure and the counter-coupling structure are therefore also protected to a certain extent to the front and rear in the axial direction and thus in the direction of the longitudinal axis.This is because the container areas of the container parts adjoining the tapered edge areas extend radially further outwards and thus form a certain shading or protection for this coupling structure and the counter-coupling structure to the front and rear.

[0017] In one embodiment, the coupling structure is arranged laterally projecting from a rear end or a rear edge of the rear edge region. Thus, the coupling structure is essentially molded onto the rearmost point of this rear edge region. This allows it to extend radially to the longitudinal axis to the maximum extent into the trough formed by the edge regions.

[0018] The same applies, in an advantageous embodiment, to the counter-coupling structure. This, too, is formed, in particular, at a front end or a front edge of the front edge region and extends radially outward laterally therefrom.

[0019] In one embodiment, the coupling structure is designed as a radial web. In particular, in the final assembled state of the tub, this web extends at least 50 percent, in particular at least 60 percent, in particular at least 70 percent, in particular at least 80 percent, in particular at least 90 percent, in particular 100 percent, of its radial extent into the radial recess formed by the tapered edge region. In particular, the web is designed to extend completely and thus also uninterruptedly around the longitudinal axis.

[0020] In one embodiment, the coupling structure is designed as a radial web which, in a pre-assembly state of the lye container in which the container parts are not yet firmly connected at the connecting region, extends to a maximum of 40 percent, in particular a maximum of 50 percent, in particular a maximum of 60 percent of its radial extent into the radial recess formed by the tapered edge region. This means in particular that in one embodiment, the coupling structure in a pre-assembly state is even longer in the radial direction or extends further radially outwards from the radial recess than in the final assembled state. This radial pre-assembly extension is particularly advantageous for joining, in particular welding. This is because it allows the required welding pressures or joining pressure to be applied during welding without any disadvantages occurring at the corresponding points.This is particularly advantageous in vibration welding, when frictional heat occurs.

[0021] In one embodiment, this can also be advantageous in that different locations are possible with regard to the orientation of the container parts prior to the permanent connection, resulting in corresponding positioning. To enable different connection positions for the container parts here as well, such a large outward projection of the web in the radial direction is advantageous. This is because the counter-coupling structure can then be positioned radially at various points on the coupling structure in an azimuthal section, or can be positioned directly on it, and only then can the permanent connection be carried out.

[0022] In such an embodiment, it can be provided that, after the coupling structures have been firmly connected to one another, any radial projection of the coupling structure that is no longer required is permanently removed. For example, this projection can be cut off, pinched off, or severed in some other way. Thus, even in such an embodiment, the above-mentioned advantageous embodiment is achieved in the final assembled state, in which the coupling structure is then arranged at least 90 percent of its radial extent in the edge recess formed by the tapered edge region.

[0023] In one embodiment, the counter-coupling structure is designed as a radial web. In the final assembled state of the suds container, the counter-coupling structure extends at least 50 percent, in particular at least 60 percent, in particular at least 70 percent, in particular at least 80 percent, in particular at least 90 percent, in particular 100 percent, of its radial extent into the radial recess formed by the tapered rear edge region. In one embodiment, it can be provided that the counter-coupling structure is designed as a radial web which, in a pre-assembled state of the suds container, in which the container parts are not yet firmly connected to one another at the connecting region, extends a maximum of 60 percent of its radial extent into the radial recess formed by the tapered front edge region.

[0024] The advantages that can be achieved are as mentioned above for the corresponding examples of the coupling structure.

[0025] In one embodiment, the coupling structure is supported by a support part on an outer side of the rear edge region. Thus, the main region of the coupling structure, preferably designed as a radial web, is supported by this support part. Bending or twisting is thus prevented.

[0026] The aforementioned radial web, which in particular forms a contact flange for the counter-coupling structure, can have a radial contact surface for the counter-coupling structure. The counter-coupling structure then rests directly against this surface.

[0027] In one embodiment, the counter-coupling structure is supported by at least one support part on an outer side of the front edge region. The corresponding advantages as mentioned for the embodiment of the support part and the coupling structure also apply here. In one embodiment, the support parts can be axially oriented plate-like elements. It is possible for the radial web, which in one embodiment forms the counter-coupling structure, to have a contact surface for the coupling structure. It is possible for the radial web of the counter-coupling structure and / or the radial web of the coupling structure to have a receptacle into which the other structure can be axially inserted. Such a receptacle can, for example, be groove-like. Thus, viewed in the axial direction, the structures not only lie against one another, but are also designed to engage with one another or overlap in this axial direction.This enables improved positioning and support.

[0028] In one embodiment, the coupling structure and the counter-coupling structure are welded together. This creates a solid connection. It is possible, for example, to energetically process the plastic materials through plastic welding, i.e., through specific thermal action, in such a way that a solid connection is subsequently formed once the material has cooled down again. A solid connection here is, in particular, a positionally fixed connection that remains permanently. In particular, this solid connection is a permanent connection. This means that it cannot be separated without destroying the components.

[0029] In one embodiment, this fixed connection is force-locking and form-locking.

[0030] In one embodiment, a rear edge or a rear end of the rear edge region is the radially innermost point of the tapered rear edge region. In particular, a front edge or a front edge or a front end of the front edge region is the radially innermost point of the tapered front edge region.

[0031] In one embodiment, a main region of the jacket wall of the front container part adjoining the rear edge region towards the front is arranged in the same radial position as a main region of the jacket wall of the rear container part adjoining the front edge region towards the rear. These main regions are in particular the container regions that extend radially further outwards than the connecting region. In particular, these main regions directly adjoin the respectively mentioned edge regions. The jacket wall or the lye jacket wall is in particular the tubular or annular cylindrical wall of the lye container. The lye container can also have a rear wall which is closed off at the rear. The lye container has a loading opening at the front.

[0032] A further aspect of the invention relates to a household appliance for washing laundry items. The household appliance comprises a tub according to the above-mentioned aspect or an advantageous embodiment thereof. In particular, the household appliance also comprises a laundry drum accommodated in the tub. The tub and the laundry drum also form a system. The system is, in particular, designed to be volume-expanded. This allows a larger number of laundry items to be washed during one laundry-care cycle.

[0033] The household appliance is preferably a washing machine or a washer-dryer.

[0034] A further aspect of the invention relates to a method for producing a tub, in particular according to the above-mentioned aspect or an advantageous embodiment thereof. The method preferably comprises the following steps: Providing a first annular container part made of plastic; providing a separate second annular container part made of plastic, in the direction of a longitudinal axis of the lye container. Arranging the second container part behind the first container part, wherein an axially rear edge region of the first container part is shaped inwards in the radial direction to the longitudinal axis, and a coupling structure is formed on this radially tapered edge region, which extends laterally outwards, and an axially front edge region of the second container part is shaped inwards in the radial direction to the longitudinal axis, and a counter-coupling structure is formed on this radially tapered edge region, which extends laterally outwards, and the coupling structure and the counter-coupling structure are firmly connected to one another to create a connection region.

[0035] Such a process also enables the simple yet highly precise production of a lye container. In particular, the degree of automation in production is particularly high. This also makes it possible to provide a lye container with increased volume, while still maintaining a highly stable, locally specific connection area and thus withstanding corresponding mechanical stresses.

[0036] It is also possible that the fixed connection of the container parts at the connecting area is not characterized by a permanent connection, but rather by a detachable connection, for example. Such a fixed detachable connection can be, for example, a screw connection or a snap connection.

[0037] In particular, the household appliance comprises a housing. The tub is accommodated in the housing. The housing preferably has a standard external width dimension. In particular, the width can be between 58 cm and 61 cm, especially between 59 cm and 60 cm.

[0038] Preferably, a width-direction distance between the tub and an inner side of an adjacent side wall of the housing is between 9 mm and 21 mm. Preferably, the distance can be between 10 mm and 13 mm or between 16 mm and 20 mm. Depending on the configuration of the household appliance, for example depending on a spring / damper configuration and / or the spin speed to be achieved, corresponding values ​​can be specifically advantageous. This distance is measured in the idle state of the tub to the side wall. Preferably, this distance is measured in the connection area to this inner side of the side wall. In particular, it is measured from the coupling structure and / or the counter-coupling structure to the inner side of the side wall.In particular, it is provided that a radially outer end of the coupling structure and / or a radially outer end of the counter-coupling structure is the radially outermost point of the entire tub.

[0039] It may be provided that such a radially inward displacement of the connecting region, particularly compared to the axially adjacent container regions of the container parts, is not formed over the entire azimuthal circumference around the longitudinal axis. It is therefore possible that this radial recess is formed in the connecting region only in local azimuthal sections.

[0040] For example, this is preferably formed in the 3 o'clock position and in the 9 o'clock position when viewed from the front of the tub. In particular, this specific connection region is formed locally only at the 3 o'clock position and only at the 9 o'clock position. Since, in particular, only at these points is there a correspondingly smaller distance to walls, in particular the side walls, of the housing and therefore, with regard to the other positioning of the tub in the housing and the relative movement of the tub to the housing during operation, a potentially critical approach of the tub to the inner sides of the walls of the housing occurs, it can be provided in one embodiment to form this specific geometric and functional connection region only at these points.At other azimuthal positions, this tapered configuration of the front edge region and / or the rear edge region may therefore not be formed or may be less formed than is the case in this 3 o'clock position or the 9 o'clock position.

[0041] One aspect of the invention relates to a laundry drum for a household appliance for washing laundry. The laundry drum has a shell wall. This shell wall is a hollow cylindrical drum shell. It is thus ring-shaped. In particular, the laundry drum can also have a rear wall, so that the laundry drum is closed at the rear when viewed along its longitudinal axis.

[0042] The drum shell has at least one annular strip. This annular strip has a first radius. The drum shell has a first expansion ring region which adjoins the annular strip towards the front as viewed in the direction of the longitudinal axis of the laundry drum. This has a larger radius than the first radius. The drum shell also has a second expansion ring region which adjoins the annular strip towards the rear as viewed in the direction of the longitudinal axis of the laundry drum. This has a larger radius than the first radius. This creates a laundry drum which, thanks to its very specific shape and geometry, has an increase in volume. In particular, it is possible for only the annular strip, which is groove-like in relation to the expansion ring regions, to have a radius as is the case with conventional volumes of laundry drums.By expanding the multiple expansion ring regions, which are very specific in this case, radially outward, an increase in volume is achieved for the entire laundry drum. This is manifested in particular by the radial volumes created by the expansion ring regions, which have radii extending beyond the first radius. It is precisely this number and arrangement of the expansion ring regions and the annular strips located between them in the axial direction that create a high level of mechanical stability, particularly of the drum shell, while still maintaining an increased volume in the laundry drum. The formation of the annular strip stabilizes the drum shell and also makes it torsionally rigid.

[0043] Viewed in the axial direction, the annular strip is smaller than the first expansion ring region and / or the second expansion ring region. Thus, these two expansion ring regions are longer in the axial direction, in particular many times longer than the annular strip. This maximizes the volume increase of the laundry drum while still taking into account the high stability of the drum shell. With such a laundry drum, a volume increase of up to 5% can be achieved compared to a cylindrical laundry drum with otherwise identical dimensions, since the radius of the drum shell of the cylindrical laundry drum can only correspond to the first radius of the annular strip in order to maintain the required distance from the inner wall of a tub in which the laundry drum is mounted so as to rotate and which has an inwardly directed constriction.

[0044] In one embodiment, the drum shell has local carrier troughs. These are, in particular, integrated into the drum shell and thus formed integrally therewith. The bases of the carrier troughs are arranged further inward than the expansion ring regions, viewed radially relative to the longitudinal axis. Therefore, any carriers arranged on these carrier troughs do not penetrate into the expansion ring regions and are therefore preferably not even partially projecting into the expansion ring region. Thus, viewed radially, the carriers project inward with their entire radial height, exposed beyond the expansion ring regions, and can thus be fully utilized for conveying the laundry items introduced.

[0045] In one embodiment, the expansion ring regions are embossed regions. They can therefore be formed by embossing into the drum shell. In particular, a driver recess and / or the ring strip can also be formed as embossed regions in the drum shell.

[0046] In one embodiment, a carrier trough has a base that is, at least in some regions, toroidal, cylindrical, or conical in shape. Thus, the base is not completely flat, but rather specifically curved. This improves both the assembly and the overall positioning of a carrier. In particular, improved transitions can then be formed between such a base of a carrier trough and an adjoining annular strip and / or an adjoining expansion ring area. Undesired snagging or even damage to laundry items at these specific localized locations can thus be avoided.

[0047] In one embodiment, a driver trough has a bottom which is cylindrical or conical in shape, at least in some areas, in particular completely.

[0048] In one embodiment, a driver recess has a base that is curved around the longitudinal axis in the circumferential direction. Thus, the shape of the base adapts to the curvature of the ring strip and / or an adjacent expansion ring region.

[0049] In one embodiment, a driver recess has a base that is curved in the circumferential direction around an axis perpendicular to the longitudinal axis. In particular, an inward curvature, thus directed toward the longitudinal axis, can be formed here. Thus, viewed in the axial direction, the base in a sectional plane in which the longitudinal axis also runs entirely is not rectilinear, but rather shaped accordingly, in particular concave. This can further enhance the aforementioned advantages.

[0050] In one embodiment, the radially outwardly open annular strip is intended as a receiving channel, in particular for a radially inwardly extending connecting area of ​​a suds container. The annular strip is therefore both locally formed on the drum shell and geometrically designed for this stated function. This makes it possible for the laundry drum and the suds container to overlap, viewed horizontally. This creates a system between a suds container and a laundry drum, both of which are designed with increased volume and yet still maintain their full functionality, even with regard to the movements required during operation of the household appliance.

[0051] In one embodiment, the first expansion ring region is conical. Additionally or instead, the second expansion ring region can be conical. This means that, in a sectional plane in which the longitudinal axis of the laundry drum runs in a straight line, an expansion ring region decreases in diameter from the annular strip to an end facing away from the annular strip or toward an edge region. Therefore, in one embodiment, the drum shell has its largest inner diameter at the location of the annular strip.

[0052] In another embodiment, the first expansion ring region is cylindrical and / or the second expansion ring region is cylindrical. A conical shape of the expansion ring regions is not provided in this case.

[0053] In one exemplary embodiment, the drum shell has a radial taper at a front edge region, viewed in the direction of the longitudinal axis, compared to the expansion ring regions. In addition, or instead of this, the drum shell has a radially tapered shape at a rear edge region, viewed in the direction of the longitudinal axis of the laundry drum, compared to the expansion ring regions. Thus, the expansion ring regions do not extend all the way to the front and rear ends of the drum shell, viewed in the axial direction, but rather end set back in relation to them. This also creates a high level of rigidity, especially at these local points in the region of the ends of the drum shell.

[0054] A further aspect of the invention relates to a system comprising a laundry drum according to the above-mentioned aspect or an advantageous embodiment and a tub. The laundry drum is accommodated in a separate tub. The tub surrounds at least the drum wall of the laundry drum.

[0055] A further aspect of the invention relates to a household appliance for washing laundry. The household appliance comprises a laundry drum according to the above-mentioned aspect or an advantageous embodiment thereof. In particular, the household appliance may also comprise a tub. The laundry drum is arranged in this tub. The household appliance may comprise a housing in which the laundry drum, in particular also the tub, is accommodated.

[0056] In one embodiment, a connecting region, at which two separate, annular container parts of the tub are connected, is arranged radially engaging with the annular strip. This is particularly the case when the tub and the laundry drum are at rest, so that they are arranged radially overlapping at this specific local location.

[0057] A further aspect of the invention relates to a method for manufacturing a laundry drum, in particular according to the above-mentioned aspect or an advantageous embodiment thereof. The method preferably comprises the following steps: Providing an annular drum wall or an annular drum shell; locally radially expanding the drum wall so that at least two expansion ring regions separated by at least one groove-like annular strip are formed. The annular strip runs circumferentially around a longitudinal axis of the laundry drum. It is formed in the same axial position in each azimuthal section. The groove-like annular strip is therefore not wavy, viewed in the circumferential direction of the longitudinal axis, but rather straight. The expansion ring regions are preferably formed identically. This means that they have the same radius in the radial direction and / or the same axial length in the axial direction. In the axial direction, the expansion ring regions are formed many times larger than the annular strip.In particular, it is intended that the drum shell be expanded from the inside, i.e., the expansion ring areas are created from the inside in a geometrically and locally defined manner. It is possible to provide a tool from the outside, particularly as a punch, which has the specific negative geometry to form the ring strip and / or driver recesses, or to prevent these local areas from being radially expanded.

[0058] The toroidal design of the base surface of a driver trough enables the driver to be mounted with a smaller rotational movement over a large radius of the surface. This creates a particularly advantageous assembly concept for a driver. Furthermore, this design of the base of the driver trough also reduces stresses in the drum shell compared to embossing a flat surface, especially compared to a cylindrical surface.

[0059] In particular, the drum shell is constructed in one piece. It is made of metal, particularly steel, such as stainless steel.

[0060] Embodiments of the invention are explained in more detail below with reference to schematic drawings. They show: Fig. 1 is a schematic representation of an embodiment of a household appliance according to the invention for the care of laundry items with a schematic representation of an embodiment of a tub according to the invention and / or an embodiment of a laundry drum according to the invention; Fig. 2 is a perspective representation of an embodiment of a drum shell of a laundry drum according to an embodiment of the invention; Fig. 3 is a sectional representation through an embodiment of a laundry drum according to the invention with a drum shell according to Fig. 2 and a mounted carrier in a carrier recess of the drum shell; Fig. 4 a sectional view through an embodiment of a system with a laundry drum according to Fig. 3 and an embodiment of a tub according to the invention; Fig. 5 shows a schematic sectional view through an embodiment of a household appliance with an embodiment of a tub according to the invention and / or an embodiment of a laundry drum according to the invention; Fig. 6 shows an enlarged view of a partial area of ​​a tub and a partial area of ​​a laundry drum; Fig. 7 shows a view according to Fig. 6 , wherein a distance between the tub and an inner side of a side wall of the housing of the household appliance is shown; Fig. 8 a representation according to Fig. 6 and Fig. 7 with an alternative embodiment of a connecting region of the suds container; and Fig. 9 shows a schematic sectional view through subcomponents of an embodiment of a household appliance according to the invention with an explanation of manufacturing scenarios for a suds container.

[0061] In the figures, identical or functionally identical elements are provided with the same reference symbols.

[0062] In Fig. 1 A household appliance 1 is shown in a schematic perspective view. The household appliance 1 is designed for washing laundry. It can be, for example, a washing machine or a washer-dryer. The household appliance 1 has a housing 2. This can also be referred to as an outer casing. This housing 2 has at least two vertical side walls 3 and 4.

[0063] The household appliance 1 also has a tub 5. Furthermore, the household appliance 1 has a laundry drum 6. The tub 5 and the laundry drum 6 form a system 7. This system 7 can be part of an oscillation system 8 of the household appliance 1. The oscillation system 8 can, for example, have several dampers and springs (not shown). With these, the tub 5 and the laundry drum 6 are movably mounted in the housing 2. As already described in Fig. 1 As shown schematically, the laundry drum 6 is accommodated in the tub 5. The household appliance 1 also has a care product dispensing device 9. This can, for example, have a dispenser tray. Furthermore, the household appliance 1 has an operating and / or display device 10. In particular, a control unit (not shown) is also provided, which is a component of the household appliance 1.

[0064] In Fig. 2 A perspective view of a drum shell 11 of the laundry drum 6 is shown. The drum shell 11 is designed here as a cylinder or a ring. In addition to this drum shell 11, the laundry drum 6 preferably has a Fig. 2 not shown rear wall 12 ( Fig. 1 ) on.

[0065] The drum shell 11 is preferably made of metal, in particular stainless steel. The laundry drum 6 has a longitudinal axis A. This is also the axis of rotation about which the laundry drum 6 is rotatably mounted during a laundry care process. The drum shell 11 has a groove-like annular strip 13. In this exemplary embodiment, the annular strip 13 is formed in the drum shell 11, completely encircling the longitudinal axis A without interruption. The annular strip 13 is formed in the same axial position over its entire azimuthal extent.

[0066] The ring strip 13 has a radius r1, which is a first radius.

[0067] As furthermore in Fig. 2 As can also be seen, the drum shell 11 has a first expansion ring region 14. This adjoins the annular strip 13 directly towards the front when viewed in the direction of the longitudinal axis A, which is oriented in the depth direction (z-direction) of the household appliance 1. In addition, the drum shell 11 has a second expansion region 15, which is different from the first expansion region 14. This adjoins the annular strip 13 towards the rear when viewed in the direction of the longitudinal axis A, in particular directly onto it. The expansion regions 14 and 15 each have a radius which is greater than the first radius r1. In particular, the two expansion regions 14 and 15 have the same second radius r2, which is greater than the first radius r1. The annular strip 13 is therefore radially smaller than the expansion ring regions 14, 15.

[0068] As can also be seen, the expansion ring regions 14 and 15 have a larger dimension in the axial direction and thus in the direction of the longitudinal axis A than the annular strip 13. In particular, this axial extension of the expansion regions 14 and 15 in the axial direction is many times, in particular at least three times, in particular at least four times, larger than the axial extension of the annular strip 13.

[0069] In particular, it is provided that only one such ring strip 13 is formed between the expansion regions 14 and 15.

[0070] In one embodiment, viewed in the axial direction, the first expansion ring region 14 ends in front of a front end or a front edge 16 of the drum shell 11. Thus, a front end 14a of the first expansion ring region 14 is set back from the front edge 16. In particular, an edge region 17, which extends between the front end 14a and the front edge 16, is formed with a smaller radius than the radius r2. This edge region 17 can also be conical, for example.

[0071] In one exemplary embodiment, the drum shell 11 has a rear end or a rear edge 18. In particular, a rear end 15a of the second expansion ring region 15 is set back from this rear edge 18. In particular, an edge region 19 between the rear edge 18 and the rear end 15a is formed with a smaller radius than the second radius r2. Here, too, a conical shape of the edge region 19 can be provided, at least in some regions.

[0072] As in Fig. 2 As can be seen, the drum shell 11 also has several driver recesses 20 and 21. In particular, three such driver recesses 20, 21 are provided. They are designed equidistant from each other in the direction of rotation around the longitudinal axis A. As shown in Fig. 2 As can be seen, these carrier troughs 20, 21 are intended to accommodate carriers (not shown) for carrying laundry items while the laundry drum 6 rotates. The carrier trough 21 preferably has a base 22. This base can preferably be toroidal, cylindrical, or conical in shape. In particular, this base 22 has a curvature when viewed in the direction of rotation around the longitudinal axis A, in particular a curvature that bulges away from the longitudinal axis A.

[0073] In particular, it is provided that this base 22 is curved in the circumferential direction about an axis perpendicular to the longitudinal axis A. This means that in a cross-section of the drum shell 11 in which the cutting plane has the longitudinal axis A or the longitudinal axis A is arranged running entirely therein, a non-rectilinear cutting edge of the base 22 is present. With such a curved shape of the base 22 in this explained cutting plane, the cutting surface of the base 22 is curved, in particular concavely curved. This means that the ends of this curved base 22, viewed in the axial direction, are further away from the longitudinal axis A than an intermediate curvature maximum, which then has the smallest radial distance from the longitudinal axis A.

[0074] As in Fig. 2 As can also be seen, the annular strip 13 merges directly into the driving recesses 20 and 21. Viewed in the axial direction, the annular strip 13 ends in a middle axial third of the length of a driving recess 20, 21, in particular completely centrally on a driving recess 20, 21.

[0075] A driver recess 20, 21 has a smaller distance from the longitudinal axis A than the expansion ring regions 14 and 15 with their second radii r2. Therefore, in one exemplary embodiment, a driver recess 20, 21 is raised relative to the expansion ring regions 14 and 15 with respect to the longitudinal axis A. When viewed from an expansion ring region 14, 15, a driver recess 20, 21 can therefore also be referred to as a driver elevation.

[0076] As can also be seen, the driver recesses 20, 21 do not extend in the axial direction beyond the axial dimensions of the expansion ring areas 14 and 15, in particular they are shorter in this respect.

[0077] In addition, fastening structures are formed in the driver recesses 20, 21, which are to be understood merely as examples, in order to be able to fasten a driver thereto.

[0078] This structure in the drum shell 11, which comprises the expansion ring regions 14 and 15 as well as the ring strip 13 and preferably also the driver recesses 20, 21, can be created by embossing. For this purpose, an embossing die can be arranged on the outside of the still undeformed material blank of the then already ring-shaped drum shell 11, which has the negative pattern of the described structure. The regions forming the expansion ring regions 14 and 15 are then pressed outward by corresponding expansion elements arranged inside the drum shell 11.

[0079] In one exemplary embodiment, the annular strip 13 then continues to have the first radius r1 that the drum shell 11 has prior to this expanding embossing. Accordingly, in one exemplary embodiment, the stamp can also have a corresponding negative structure or negative mask for creating the driver recesses 20, 21. Here, too, the above-mentioned exemplary shapes can be created by applying appropriate pressure from the interior of the drum shell 11.

[0080] The annular strip 13 is designed both locally and geometrically as a receiving groove for a radially inwardly formed connecting area of ​​the lye container 5.

[0081] In the exemplary embodiment, the expansion ring areas 14 and 15 are cylindrical. In another exemplary embodiment, as will be Fig. 5 As explained, the expansion ring areas 14 and 15 can also be conical.

[0082] In Fig. 3 The laundry drum 6 is shown in a longitudinal section. In Fig. 3 The inside of the drum shell 11 can therefore also be seen. A carrier 23 is mounted in the carrier recess 20, for example. Furthermore, a front attachment 6a of the laundry drum 6 can also be seen, which in one embodiment is arranged on the front edge region 17.

[0083] As in Fig. 2 and Fig. 3 As can be seen, the transitions between a bottom of the ring strip 13 and the expansion ring regions 14 and 15 are inclined and / or rounded in the example. The same is preferably provided for the transitions between the bottom of the driver recess 20 and the expansion ring regions 14 and 15.

[0084] In Fig. 4 The laundry drum 6 and an embodiment of a tub 5 are shown in a longitudinal section. Therefore, an embodiment of a system 7 is shown. The laundry drum 6 is preferably according to the embodiment in Fig. 2 and Fig. 3 trained.

[0085] In particular, the drum shell 11 is formed in one piece or from a one-piece blank.

[0086] In contrast, the lye container 5 is constructed in several parts. It preferably has a first annular container part 24. This is made of plastic, in particular completely of plastic. It can, for example, be an injection-molded component. In addition, the lye container 5 has a second container part 25 separate from the first container part 24. This is also made of plastic. It can also be an injection-molded component. The two separate container parts 24 and 25 are firmly connected to one another at a connecting area 26. As already described in Fig. 4 As can be seen, this connecting region 26 is located further inwards in the radial direction than the main regions or expanded container regions 27 and 28 of the container parts 24 and 25 which adjoin the connecting region 26 in the axial direction to the front and rear. It can also be seen that this connecting region 26 engages in the annular strip 13 of the drum shell 11 or extends into it, as viewed perpendicular to the longitudinal axis A. Therefore, in this assembled final state of the system 7, as viewed perpendicular to the longitudinal axis A, an overlapping arrangement is formed between the suds container 5 and the laundry drum 6 at this specific local location. A rear wall 29 of the suds container 5 is also shown.

[0087] In Fig. 5 A further embodiment of the system 7 is shown in a schematic sectional view. This sketchy representation shows that the laundry drum 6, particularly in the expansion regions 14 and 15, does not have coaxial wall sections with respect to the longitudinal axis A, but rather, a conical orientation of the expansion regions 14 and 15 is formed. Therefore, in this example, the container sub-regions 27 and 28 are also conical.

[0088] In Fig. 6 An enlarged view of an embodiment of the lye container 5 is shown in the connecting region 26. As can be seen here, an axially rear edge region 30 of the first front annular container part 24 is designed to taper continuously radially inward. Furthermore, in one embodiment, a front edge region 31 of the rear second annular container part 25, viewed in the direction of the longitudinal axis A, is designed to taper continuously radially.

[0089] Thus, a radial recess 32 is formed in relation to the radial positions of these edge regions 30 and 31 as well as the container regions 27 and 28. A coupling structure 33 and a counter-coupling structure 34 extend into this radial recess 32. The coupling structure 33 is formed integrally on the rear edge region 30. It can have a radial web 35. In particular, this radial web 35, which extends in Fig. 6 is shown only schematically and symbolically, from a front end or a rear edge 36 of this rear edge region 30. Furthermore, in one embodiment, it can be provided that the front edge region 34 has a radially oriented web 37. In one embodiment, this web can extend radially outward from a front end or a front edge 38 of this front edge region 31.

[0090] It is possible for the coupling structure 33 and / or the counter-coupling structure 34 to merely have contact surfaces on which these two structures abut one another. However, at least one of the two structures, i.e. the coupling structure 33 and / or the counter-coupling structure 34, can also have axial receptacles into which the other structure can then axially engage. This can also create a connecting region 20 in which the structures 33 and 34 are designed to engage axially. Furthermore, this axial engagement can also form a radial stop, so that the position of the container parts 24 and 25 can be varied perpendicular to the longitudinal axis A, but is limited by these stops.

[0091] As in Fig. 6 As can be seen, the coupling structure 33 and the counter-coupling structure 34 extend with their dimensions viewed perpendicular to the longitudinal axis A at least 90 percent within the radial recess 32. In this regard, a schematic representation in Fig. 6 an assembled final state of the lye container 5 is shown.

[0092] Expressed inversely, the lye container 5 has expanded radially outside the connecting region 26. The container regions 27 and 28 are thus widened radially.

[0093] A distance b, as in Fig. 6 perpendicular to the longitudinal axis A and is measured between the radial minimum of the connecting region 26 and the bottom of the annular strip 13, is in one example preferably between 10 mm and 12 mm.

[0094] In Fig. 7 is a representation according to Fig. 6 Here, a distance a, which is measured perpendicular to the longitudinal axis A, is shown between a radially outer point of the connecting region 26 and an inner side of a side wall, shown here as an example of the side wall 4. This distance a is preferably between 9 mm and 21 mm and particularly preferably between 9 mm and 13 mm or between 16 mm and 20 mm.

[0095] In Fig. 8 is a corresponding representation as in Fig. 6 and Fig. 7 However, in contrast to Fig. 6 and Fig. 7 , in which assembled final states are shown, a pre-assembly state of the tub 5 is shown. The coupling structure 33 and / or the counter-coupling structure 34 are formed here in the radial direction to the longitudinal axis A with an extent that projects significantly further laterally beyond the radial recess 32 than in the manufactured final states according to Fig. 6 and Fig. 7 is the case. In particular, the radial webs 35 and 37 have radial projections. These are preferably provided so that during production and before the connection of the container parts 24 and 25, the position perpendicular to the longitudinal axis A can be variably adjusted. In order to avoid that in an azimuthal position in the direction of rotation around the longitudinal axis A, viewed radially, there would no longer be any contact between the coupling structure 33 and the counter-coupling structure 34, this extension is provided here. Once the desired end position between the container parts 24 and 25 has been set, and then the fixed connection between the coupling structures 33 and the counter-coupling structure 34 has been set, for example by welding, screwing, or snapping, the no longer required radial projection of the webs 35 and / or 37 can be removed in a further production step. This then creates a corresponding configuration, as shown in Fig. 6 and Fig. 7 is shown schematically. Even then, in the final manufactured state, a distance a is realized, which is maintained when the system 7 is at rest and thus the household appliance 1 is not in operation.

[0096] As in Fig. 8 can also be seen, and can also be present in all other exemplary embodiments, the connecting region 26 has at least one support part 40. This is formed on the coupling web 35 and ends on the outside of the tapered edge region 30 and / or optionally also beyond that on an outside of the container region 27. In one exemplary embodiment, it is possible for at least one further support part 39 to be provided. This is formed on the web 37 and ends on an outside of the edge region 31. If necessary, it can also extend axially so far that it ends on an outside of the container region 28. The support parts 39 and 40 can, for example, be plate-like. In particular, they are formed integrally with the respective container parts 24 and 25.

[0097] Especially when the container parts 24 and 25 are made of plastic, tools are provided which also allow corresponding undercuts. These can be demolded using so-called sliders. It is possible that vibration welding can be used when connecting the container parts 24 and 25, for example by welding. For example, a welding tool with a holding device is then provided. It is then possible that one of the two container parts 24, 25 is fastened to the holding device. In a subsequent step, the laundry drum 6 is then inserted into this container part. Subsequently, the other container part of the suds container 5 is positioned from above over the laundry drum 6. This attached further container part of the suds container 5 is then, as shown in Fig. 9 shown, is moved in a vibration direction V, which is oriented perpendicular to the longitudinal axis A, with a specific amplitude and at the same time is moved translationally in the direction Y, i.e. in the direction of the longitudinal axis A. In this case, pressure is exerted on the flange, which is formed by the coupling structure 33 and the counter-coupling structure 34.

[0098] It is possible that the radial extent of the preferably fully circumferential coupling webs 33 and / or the counter-coupling structure 34 differs in azimuthal sections. For example, this radial extent may be smaller at the 3 o'clock position and the 9 o'clock position than in other azimuthal sections. Therefore, in particular, the scenario according to Fig. 8 It is provided that a temporary overhang is also formed at the 3 o'clock position and the 9 o'clock position, which is then removed after the permanent connection has been created, so that the dimension or distance a is also set at this 3 o'clock position and the 9 o'clock position. This makes it possible to create a stable and tight design of the connection area 26 precisely at this point, which is narrower than other azimuthal positions, between the lye container 5 and a side wall 3, 4. Once this permanent connection has been formed, the overhang that is no longer required can subsequently be cut off, in particular at the 3 o'clock position and the 9 o'clock position. For example, an ultrasonic cutting process can be used here.

[0099] In this context, the holding tool or the holding device, as already mentioned above, moves from the radial direction toward the outside of the container part that is first provided and into which the laundry drum 6 is then inserted. In particular, this slide then moves from the radial direction toward the outside of the edge area of ​​the container part that is first provided.

[0100] This pre-assembly module is thereby held in place with the provided container part and the laundry drum 6 inserted therein. Subsequently, in this held state, the previously mentioned welding tool is used to create the fixed connection at the connecting area 26 between the then two existing container parts 24 and 25.

[0101] This firm connection, in particular welding, takes place when, according to the explanation to Fig. 9 the desired position between the container parts 24 and 25 is reached. Bezugszeichenliste

[0102] 1Household appliance 2Housing 3Side wall 4Side wall 5Soap container 6Washing drum 6aAttachment 7System 8Oscillating system 9Detergent dispenser 10Display device 11Drum shell 12Rear wall 13Ring strip 14Expansion ring area 15Expansion ring area 16Edge 17Edge 18Edge 19Edge 20Driver recess 21Driver recess 22Base 23Driver 24Container part 25Container part 26Connecting area 27Container area 28Container area 29Rear wall 30Edge 31Edge 32Radial recess 33Coupling structure 34Counter-coupling structure 35Coupling web 36Edge 37Web 38Edge 39Support part 40Support part

Claims

1. A tub (5) for a household appliance (1) for washing laundry, comprising a first annular container part (24) made of plastic and a separate second annular container part (25) made of plastic, which is arranged behind the first container part (25) in the direction of a longitudinal axis (A) of the tub (1), wherein the two container parts (24, 25) are firmly connected to one another at a connecting region (26), characterized in thata rear edge region (30) of the first container part (24) is shaped inwards in the radial direction to the longitudinal axis (A), and on this radially tapered rear edge region (30) a coupling structure (33) is formed which extends laterally outwards, and a front edge region (31) of the second container part (25) is shaped inwards in the radial direction to the longitudinal axis (A), and on this radially tapered front edge region (31) a counter-coupling structure (34) is formed which extends laterally outwards and is firmly connected to the coupling structure (33).

2. Lye container (5) according to claim 1, characterized in that the rear edge region (30) is continuously bent inwards.

3. Lye container (5) according to claim 1 or 2, characterized in that the front edge region (31) is continuously bent inwards.

4. Lye container (5) according to one of the preceding claims, characterized in thatthe coupling structure (33) is formed with a radial web (35) which, in the assembled final state of the lye container (5), extends at least to 90% of its radial extent in the radial recess (32) formed by the tapered edge region (30).

5. Lye container (5) according to one of the preceding claims, characterized in that the coupling structure (33) is formed with a radial web (35) which, in a pre-assembled state of the lye container (5), in which the container parts (24, 25) are not yet firmly connected at the connecting region (26), extends to a maximum of 60% of its radial extent in the radial recess (32) formed by the tapered rear edge region (30).

6. Lye container (5) according to one of the preceding claims, characterized in thatthe counter-coupling structure (34) is formed with a radial web (37) which, in the assembled final state of the tub (5), extends at least to 90% of its radial extent in the radial recess (32) formed by the tapered front edge region (31).

7. Lye container (5) according to one of the preceding claims, characterized in that the counter-coupling structure (34) is formed with a radial web (37) which, in a pre-assembled state of the lye container (5), in which the container parts (24, 25) are not yet firmly connected at the connecting region (26), extends to a maximum of 60% of its radial extent in the radial recess (32) formed by the tapered front edge region (31).

8. Lye container (5) according to one of the preceding claims, characterized in that the coupling structure (33) is supported by a support part (40) on an outer side of the rear edge region (30).

9. Lye container (5) according to one of the preceding claims, characterized in that the counter-coupling structure (34) is supported by a support part (39) on an outer side of the front edge region (31).

10. Lye container (5) according to one of the preceding claims, characterized in that the coupling structure (33) and the counter-coupling structure (34) are welded.

11. Lye container (5) according to one of the preceding claims, characterized in that a rear edge (36) of the rear edge region (30) is the radially innermost point of the tapered rear edge region (30).

12. Lye container (5) according to one of the preceding claims, characterized in that a front edge (38) of the front edge region (31) is the radially innermost point of the tapered front edge region (31).

13. Lye container (5) according to one of the preceding claims, characterized in thata main region (27) of the jacket wall of the front container part (24) adjoining the rear edge region (30) to the front is arranged in the same radial position as a main region (28) of the jacket wall of the rear container part (25) adjoining the front edge region (31) to the rear.

14. Household appliance (1) for the care of laundry items, with a tub (5) according to one of the preceding claims.

15. A method for producing a lye container (5), in particular according to one of the preceding claims, comprising the following steps: - providing a first annular container part (24) made of plastic; - providing a separate second annular container part (25) made of plastic;- in the direction of a longitudinal axis (A) of the lye container (5), arranging the second container part (25) behind the first container part (24), wherein - a rear edge region (30) of the first container part (24) is shaped inwards in the radial direction to the longitudinal axis (A), and a coupling structure (33) is formed on this radially tapered edge region (30) which extends laterally outwards, and a front edge region (31) of the second container part (25) is shaped inwards in the radial direction to the longitudinal axis (A), and a counter-coupling structure (34) is formed on this radially tapered edge region (31), which counter-coupling structure extends laterally outwards, and - the coupling structure (33) and the counter-coupling structure (34) are firmly connected to one another to produce a connecting region (26);

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