Bearing-spray arm arrangement, domestic dishwasher and method

Abstract

The invention relates to a bearing-spray arm arrangement (15) for a domestic dishwasher (1), comprising a spray arm (18) and a bearing (17) which supports the spray arm (18) in rotation about a rotational axis (19), wherein a sliding plane (20) is formed between the bearing (17) and the spray arm (18), said sliding plane being arranged perpendicularly to the rotational axis (19), wherein at least one groove (28, 28') is provided which extends tangentially (t) or radially (r) in the sliding plane (20).

Description

[0001] 202402708

[0002] 1 / 21

[0003] Storage spray arm arrangement, household dishwasher and process

[0004] The present invention relates to a bearing-spray arm arrangement, a household dishwasher and a method.

[0005] Standard household dishwashers typically consist of a wash chamber and several racks on which dirty dishes can be placed for cleaning. When the dishwasher is running, a mixture of water and detergent, also known as the wash liquor, is sprayed through nozzles into the wash chamber onto the dirty dishes, usually by a pump. The wash liquor washes away dirt particles from the dirty dishes, thus cleaning them. The dirt particles are then filtered out by the wash liquor, which is then pumped back to the nozzles.

[0006] It is known to use a rotatably mounted spray arm with multiple nozzles for distributing the wash water. The spray arm is mounted, for example, below one of the dish racks on a supply line for the wash water, using a bearing, and rotates during operation of the household dishwasher. The torque that causes the spray arm to rotate is generated by the controlled discharge of the wash water from the nozzles. This allows the wash water to be distributed evenly throughout the wash chamber.

[0007] The spray arm is mounted on a bearing so that it can rotate. A challenge can be ensuring this rotation reliably when the rinsing solution is heavily loaded with dirt particles.

[0008] The publication EP 2556781 B1 discloses a spray arm assembly for a dishwasher, in particular a household dishwasher. The spray arm assembly comprises a spray arm and a retaining element for holding the spray arm. The spray arm is rotatably mounted on the retaining element. At least one bearing section and at least one counter-bearing section are provided for the rotatable mounting. The bearing section has recesses. The spray arm assembly is 202402708

[0009] 2 / 21

[0010] characterized in that the recesses of the bearing section have an expanding shape.

[0011] Against this background, one object of the present invention is to improve the bearing of a spray arm.

[0012] Accordingly, a bearing-spray arm arrangement for a household dishwasher is proposed, comprising a spray arm and a bearing which rotatably supports the spray arm about an axis of rotation, wherein a sliding plane is formed between the bearing and the spray arm, which is arranged perpendicular to the axis of rotation, and wherein at least one groove is provided which extends tangentially or radially in the sliding plane.

[0013] The groove is advantageously designed to form a channel through which the dishwashing liquid flows during operation of the household dishwasher, in order to remove dirt particles located in the sliding plane. In particular, this changes the rotational resistance of the spray arm.

[0014] The bearing-spray arm arrangement is specifically designed to distribute the washing liquor evenly in a washing chamber of the household dishwasher using the spray arm.

[0015] A household dishwasher (hereinafter also referred to as a dishwasher) can include a wash chamber. For example, dishes, especially those to be cleaned, can be placed in the wash chamber. The dishes can be placed on one or more dish racks. For example, the spray arm assembly can be located below and / or above the one or more dish racks. The spray arm assembly can be located on the top and / or bottom of the wash chamber.

[0016] In particular, several bearing-spray arm arrangements can be arranged in the rinsing chamber.

[0017] The spray arm can have two wings, with a receptacle positioned between the two wings. The receptacle can be configured to hold the bearing 202402708.

[0018] 3 / 21

[0019] The spray arm can be designed to direct the wash water to the one or more nozzles within the spray arm. It can also have a cavity. This cavity can be configured to direct the wash water to the nozzles. The wash water then exits the cavity through these nozzles, specifically into the wash chamber of the household dishwasher. The nozzles can be positioned on the spray arm to generate torque as the wash water exits. The spray arm can also have an inlet opening. This inlet opening allows the wash water to enter the cavity and can have a circular cross-section. The spray arm is typically manufactured using an injection molding process.

[0020] For example, the bearing is connected on one side to an inlet, in particular a pipe. For example, the inlet can direct the cleaning solution to the bearing. The bearing can direct the cleaning solution to a second side. In particular, the spray arm's inlet opening is located on the second side.

[0021] In particular, the axis of rotation is located at the center of the spray arm's inlet opening. For example, the bearing directs the cleaning solution parallel or along the axis of rotation. Specifically, the spray arm rotates relative to the bearing in the sliding plane.

[0022] A groove extending radially in the sliding plane is understood to mean that a longitudinal axis, in particular a central axis, of the groove intersects the axis of rotation. A groove extending tangentially in the sliding plane is understood to mean that a longitudinal axis, in particular a central axis, of the groove forms a circle around the axis of rotation and touches the sliding plane at a single point. In particular, the groove can extend exclusively radially or exclusively tangentially in the aforementioned sense; in other embodiments, the groove could also extend section by section radially and section by section tangentially. The groove can extend exclusively linearly, in particular with a constant cross-section. 202402708

[0023] 4 / 21

[0024] The groove is specifically shaped as a recess. For example, the groove has a bottom (base), a first and a second side wall, which may be opposite each other. The groove may have a U-shaped cross-section. In particular, the groove has an open side opposite the bottom. The open side may lie in the sliding plane.

[0025] For example, the groove is designed with a polygonal cross-section. In particular, the groove has a semicircular or semi-elliptical cross-section.

[0026] According to one embodiment, the bearing has a sliding surface on which a corresponding sliding surface of the spray arm is supported, wherein at least one groove is formed in the sliding surface and / or in the corresponding sliding surface.

[0027] Advantageously, by arranging the at least one groove in the sliding surface and / or in the corresponding sliding surface, the amount of lubricant (flushing solution) between the sliding surface and the corresponding sliding surface can be increased, thereby reducing the frictional torque compared to a bearing-spray arm arrangement without the at least one groove.

[0028] For example, the sliding surface and / or the corresponding sliding surface has a circular, in particular annular, cross-section. In particular, the sliding surface and the corresponding sliding surface are arranged parallel to each other. The sliding surface and the corresponding sliding surface can be arranged perpendicular to the axis of rotation.

[0029] According to a further embodiment, the bearing-spray arm arrangement is characterized by a sliding disc which is arranged between a sliding surface of the bearing and a corresponding sliding surface of the spray arm, wherein at least one groove is formed in the sliding surface, in the corresponding sliding surface or in the sliding disc.

[0030] Advantageously, the probability of dirt particle discharge can be increased, particularly with the aid of a freely rotating sliding disc. 202402708

[0031] 5 / 21

[0032] For example, the sliding plane is formed between the sliding surface and the sliding disc and / or between the corresponding sliding surface and the sliding disc.

[0033] According to a further embodiment, the bearing has an axial through-opening which is designed to introduce rinsing liquor into the spray arm, wherein the at least one groove is designed to direct rinsing liquor from the spray arm into a rinsing chamber of the household dishwasher.

[0034] Advantageously, the groove allows for the capture and removal of dirt particles from the bearing-spray arm assembly into the rinsing chamber, thus maintaining a uniform rotational movement of the spray arm. This also makes spray arm-bearing assemblies feasible that exhibit large tolerances between the sliding surface and the corresponding sliding surface.

[0035] In particular, the bearing's through-hole can fluidically connect the inlet and the spray arm's cavity. The through-hole can be cylindrical or circular in cross-section. It can extend parallel to the axis of rotation, or its central axis can be collinear with the axis of rotation. The cleaning solution is guided to the bearing, for example, along the axis of rotation, via the through-hole.

[0036] For example, the spray arm cavity and the rinsing chamber are fluidically connected via the groove. In particular, compared to at least one nozzle, a small amount of rinsing solution is directed into the rinsing chamber via the groove.

[0037] According to another embodiment, the bearing has a flange which includes the sliding surface, wherein the at least one groove at one end breaks through an outer circumference of the flange.

[0038] Advantageously, this allows an initial opening of the groove to be formed leading to the cavity in the spray arm. 202402708

[0039] 6 / 21

[0040] For example, the flange is formed at one end of the bearing. The flange is, for example, arranged perpendicular to the axis of rotation. For example, the flange has a circular, in particular annular, cross-section.

[0041] According to another embodiment, the bearing has a bearing journal connected to the flange, wherein the bearing journal has a further groove into which the groove at its other end opens.

[0042] Advantageously, the removal of dirt particles from the sliding plane can be further improved with the help of the additional groove.

[0043] For example, the bearing journal is designed as a cylinder with a circular, in particular annular, cross-section. Specifically, the bearing journal has an outer surface and / or an inner surface. For example, the through-hole is bounded by the inner surface. The bearing journal can be connected to the inlet at one end. For example, the bearing journal has fastening means for connecting it to the inlet. In particular, the fastening means can include a thread, one or more openings, and / or one or more projections. The bearing journal and the flange can be formed in one piece. The bearing can be manufactured by injection molding.

[0044] The further groove can be encompassed by the outer surface of the bearing journal.

[0045] In particular, the groove and the subsequent groove form a channel with an L-shaped cross-section.

[0046] According to another embodiment, the additional groove extends parallel to the axis of rotation and / or the additional groove is designed as an annular groove coaxial to the axis of rotation.

[0047] Advantageously, the discharge of dirt particles can be further improved by the arrangement and design of the additional groove.

[0048] For example, the additional groove can be shaped as a blind hole. 202402708

[0049] 7 / 21

[0050] According to a further embodiment, the at least one groove extending in the sliding surface, the corresponding sliding surface or the sliding disc is closed off at least partially on its circumference by the other sliding surface or the sliding disc.

[0051] For example, the open side of the groove is at least partially closed by the other sliding surface. In particular, a channel with a cylindrical cross-section can be formed by this partial closure. For example, the cylindrical cross-section comprises a partially continuous lateral surface, wherein the lateral surface includes the underside, the first and second side walls, and at least a section of the other sliding surface.

[0052] According to another embodiment, the spray arm surrounds the flange of the bearing.

[0053] The bearing pin can be encompassed by the spray arm's inlet opening. Furthermore, the bearing pin can extend into the inlet opening.

[0054] The sliding surface can be located on a first side of the flange.

[0055] For example, the sliding surface is arranged at least in one section between an outer circumference of the flange and the outer surface of the bearing journal.

[0056] The additional sliding surface can be located on a first side of the spray arm.

[0057] According to a further embodiment, the at least one groove, which extends tangentially, is tilted relative to a radius on the axis of rotation in such a way that an opening of the at least one groove points towards the direction of rotation of the spray arm during operation of the household dishwasher.

[0058] Advantageously, this improves the flow of cleaning solution during the rotation of the spray arm, thereby increasing the likelihood of dirt particles being flushed out of the sliding plane. 202402708

[0059] 8 / 21

[0060] In particular, the opening of the at least one groove that points in the direction of rotation is the opening that breaks through the outer circumference of the bearing flange.

[0061] In particular, the radius is arranged perpendicular to the axis of rotation. For example, the radius extends along the radial extent of the at least one groove on the axis of rotation.

[0062] In particular, the direction of rotation of the spray arm is executed along a circumferential direction around the axis of rotation.

[0063] According to another embodiment, the at least one groove, which extends tangentially, has an angle of at least 30 degrees, preferably at least 60 degrees, with a radius to the axis of rotation.

[0064] In one embodiment, the at least one groove, which extends tangentially, has an angle between 30 and 60 degrees with a radius on the axis of rotation. The groove can have a central axis along which it extends lengthwise. The central axis can divide the groove into at least two symmetrical halves. For example, the central axis is at an angle to the radius. If the first and / or second side wall of the groove runs parallel to the central axis, the angle between the first and / or second side wall and the radius is [insert angle here]. Furthermore, another angle between 120 and 150 degrees can occur between the radius on the axis of rotation and the groove. In particular, the angle is 45 degrees, with the further angle being 135 degrees.

[0065] According to another embodiment, at least three, preferably at least or exactly four grooves are provided.

[0066] Advantageously, this can increase the removal of dirt particles from the sliding plane.

[0067] For example, the at least three grooves, or the at least or exactly four surfaces, are evenly spaced apart along the circumference. 202402708

[0068] 9 / 21

[0069] According to another aspect, a household dishwasher with a bearing-spray arm arrangement according to the first aspect or an embodiment of the first aspect is proposed.

[0070] According to another aspect, a method for flushing dirt particles from a sliding plane between a bearing and a spray arm in a household dishwasher is proposed. The spray arm is rotatably mounted on the bearing about an axis of rotation. The method comprises the steps: a) rotating the spray arm about the axis of rotation, wherein the sliding plane is arranged perpendicular to the axis of rotation; and b) flushing at least one groove, which extends tangentially or radially in the sliding plane with respect to the axis of rotation, with cleaning solution in the tangential or radial direction during step a).

[0071] The embodiments and features described for the proposed bearing-spray arm arrangement apply accordingly to the proposed household dishwasher and the proposed method.

[0072] Other possible implementations of the invention also include combinations of features or embodiments described previously or subsequently with regard to the exemplary embodiments, even if not explicitly mentioned. In such cases, the person skilled in the art will also add individual aspects as improvements or additions to the respective basic form of the invention.

[0073] Further advantageous embodiments and aspects of the invention are the subject of the dependent claims and the exemplary embodiments of the invention described below. The invention will be explained in more detail below with reference to preferred embodiments and the accompanying figures.

[0074] Fig. 1 shows a schematic perspective view of an embodiment of a household dishwasher;

[0075] Fig. 2 shows a first embodiment of a bearing-spray arm arrangement arranged in the rinsing chamber from Fig. 1;202402708

[0076] 10 / 21

[0077] Fig. 3 shows a top view of an embodiment of a bearing;

[0078] Fig. 4 shows a section of an embodiment of a spray arm in cross-section from a bottom view;

[0079] Fig. 5 shows a second embodiment of a bearing-spray arm arrangement;

[0080] Fig. 6 shows a third embodiment of a bearing-spray arm arrangement;

[0081] Fig. 7 shows a fourth embodiment of a bearing spray arm arrangement; and

[0082] Fig. 8 shows steps of a method for flushing dirt particles out of a bearing spray arm arrangement.

[0083] In the figures, identical or functionally equivalent elements have been given the same reference symbols, unless otherwise indicated.

[0084] Fig. 1 shows a schematic perspective view of an embodiment of a household dishwasher 1. The household dishwasher 1 comprises a wash tub 2, which can be closed by a door 3, in particular a watertight seal. For this purpose, a sealing device can be provided between the door 3 and the wash tub 2. The wash tub 2 is preferably cuboid in shape. The wash tub 2 can be arranged in a housing of the household dishwasher 1. The wash tub 2 and the door 3 can form a wash chamber 4 for washing dishes.

[0085] The door 3 is shown in its open position in Fig. 1. The door 3 can be opened or closed by pivoting it about a pivot axis 5 provided at one lower end of the door 3. The door 3 can be used to open or close a loading opening 6 of the wash tank 2. The wash tank 2 has a base 7, a ceiling 8 opposite the base 7, a rear wall 9 opposite the closed door 3, and two opposing side walls 10, 11. The base 7, the ceiling 8, the rear wall 9, and the side walls 10, 11 can, for example, be made of a [202402708]

[0086] 11 / 21

[0087] It may be made of stainless steel sheet. Alternatively, for example, the base 7 could be made of a plastic material.

[0088] The household dishwasher 1 further comprises at least one dishware holder 12 to 14. Preferably, several, for example three, dishware holders 12 to 14 can be provided, wherein dishware holder 12 can be a lower dishware holder or a lower basket, dishware holder 13 an upper dishware holder or an upper basket, and dishware holder 14 a cutlery drawer. As further shown in Fig. 1, the dishware holders 12 to 14 are arranged one above the other in the wash tub 2. Each dishware holder 12 to 14 can be selectively moved into or out of the wash tub 2. In particular, each dishware holder 12 to 14 can be pushed or moved into the wash tub 2 in an insertion direction E and pulled or moved out of the wash tub 2 in an extension direction A opposite to the insertion direction E.

[0089] Furthermore, at least one bearing-spray arm assembly 15, as shown in Fig. 2, is provided in the washing chamber 4. Preferably, the bearing-spray arm assembly 15 is attached to one of the dishware holders 12 to 14 (in particular to the underside of the upper basket 14) and / or to the ceiling 8.

[0090] The bearing-spray arm arrangement 15 is, for example, attached to one end of an inlet 16, in particular positively connected to the end of the inlet 16.

[0091] The bearing-spray arm assembly 15 further comprises a bearing 17 and a spray arm 18. The spray arm 18 is rotatably mounted relative to the bearing 17 about an axis of rotation 19 by means of the bearing 17. When the spray arm 18 rotates about the axis of rotation 19, the bearing 17 and the spray arm 18 form a common sliding plane 20. The bearing 17 and the spray arm 18 can be made of plastic material or each manufactured by means of an injection molding process.

[0092] The spray arm 18 can have nozzles 21. The nozzles 21 can be configured to distribute the wash liquor 22 in the wash chamber 4 of the household dishwasher 1, with one flow direction of the wash liquor 22 being shown as arrows in Fig. 2. The wash liquor 22 is directed, for example, to the bearing-spray arm assembly 15 by means of the inlet 16. A through-opening 23 (see Fig. 3) in the bearing 17 allows the 202402708

[0093] 12 / 21

[0094] The cleaning solution 22 is directed into a cavity 24 of the spray arm 18 and to the nozzles 21. The nozzles 21 are specifically oriented such that a recoil force is generated when the cleaning solution 22 is discharged into the cleaning chamber 4. This recoil force can produce a torque that acts on the spray arm 18 and generates a rotational movement 25 (see Fig. 3) of the spray arm 18 about the axis of rotation 19. Furthermore, a smaller portion of the cleaning solution 22, compared to the amount exiting the nozzles 21, can escape from the cavity 24 into the cleaning chamber 4 through the sliding plane 20 at a connection point between the bearing 17 and the spray arm 18.

[0095] Figure 3 shows a top view of an embodiment of the bearing 17. The bearing 17 comprises a bearing journal 26 and a flange 27. The bearing journal 26 can be designed as a hollow cylinder, in particular with an annular cross-section.

[0096] Preferably, the axis of rotation 19 is arranged centrally in the hollow cylinder. The bearing journal 26 encompasses the through-opening 23, which is bounded by an inner surface of the hollow cylinder.

[0097] The flange 27 can be configured as a cylinder with a first and second end face. Grooves 28 are provided on the first end face of the flange 27. For example, as shown in the embodiment in Fig. 3, four grooves 28 are arranged on the first end face of the flange 27. The spray arm 18 rests on the first end face of the flange 27 with the grooves 28, with its underside as shown in Fig. 4. When the bearing 17 and the spray arm 18 form the bearing-spray arm assembly 15, the first end face of the flange 27 and the underside of the spray arm 18 are in contact with each other. A first sliding surface 29 of the bearing 17 and a corresponding second sliding surface 30 (see Fig. 4) of the spray arm 18 form the sliding plane 20.

[0098] For example, the first and second sliding surfaces 29, 30 are circular, in particular annular.

[0099] The features of the grooves 28 are explained using an example of a groove 28. The groove 28 is formed as a recess in the first sliding surface 29. The groove 28 is designed such that it has an open side facing the first sliding surface 29. If the bearing 17 and the spray arm 18 are formed as part of the bearing-spray arm assembly 15, the second sliding surface 30 covers the open side, thus creating, for example, a channel comprising the open side, a bottom surface, and two opposing surfaces.

[0100] 13 / 21

[0101] The groove 28 forms wall sides. With the aid of the channel, the washing liquid 22 can flow into and through the sliding plane 20 in the operation of a household dishwasher. Furthermore, the groove 28 includes a longitudinal or central axis 31. The central axis 31 is, for example, located centrally within the groove 28 when viewed from above.

[0102] The groove 28 in Fig. 3 is arranged such that it has a tangential extent t. The central axis 31 of the groove 28 intersects the inner surface, which is formed as a circle coaxial with the axis of rotation 19, at exactly one point. The tangential extent t is achieved, in particular, by tilting the groove 28 by an angle α relative to a radius R. Specifically, the angle α can be measured between the radius R and the central axis 31. The angle α has values ​​between 30 and 60 degrees. Preferably, the angle α has a value of 45 degrees.

[0103] In Fig. 3, a groove 28' is also shown as a dashed line. The groove 28' has, for example, a radial extent r, with a central axis 31' of the groove 28' intersecting the axis of rotation 19.

[0104] In another embodiment, not shown in Fig. 3, the groove 28, 28' can have a radial and tangential extent r, t, wherein a central axis 31, 31' of the groove 28, 28' is arranged parallel to the radial and tangential extent r and t respectively.

[0105] Furthermore, the groove 28 includes an opening 32. The opening 32 is arranged such that it penetrates an outer circumference U of the first sliding surface 29 or of the flange 27. In addition, the opening 32 points in the direction of the rotational movement 25 of the spray arm 18 during operation of the household dishwasher 1.

[0106] Figure 4 shows a section of an embodiment of the spray arm 18 in a cross-sectional view from below. The spray arm 18 includes, for example, the second sliding surface 30 on its underside. The second sliding surface 30 can be directed inwards into the cavity 24.

[0107] Furthermore, the spray arm 18 can have an inlet opening 33. The inlet opening 33 has, for example, a circular cross-section. For example, the axis of rotation 19 is arranged centrally in the inlet opening 33. Are the spray arm 18 and the bearing 17202402708

[0108] 14 / 21

[0109] Designed for the bearing-spray arm arrangement 15, the spray arm 18 encompasses the flange 27 of the bearing 17. The flange 27 is then arranged in particular in the cavity 24, thereby forming, for example, a positive-locking connection between the bearing 17 and the spray arm 18.

[0110] Figs. 5, 6 and 7 show a second, third and fourth embodiment of the bearing-spray arm arrangement 15 from Fig. 2. The differences between the embodiments compared to the embodiment from Fig. 2 are discussed below.

[0111] Figure 5 shows the second embodiment of the bearing-spray arm arrangement 15. For example, a sliding disc 34 is arranged between the bearing 17 and the spray arm 18. During operation of the household dishwasher 1, sliding can occur between the sliding disc 34 and the first and / or between the sliding disc 34 and the second sliding surface 29, 30 (see Figures 3 and 4) during the rotational movement 25 of the spray arm 18. For example, the sliding plane 20 can then form between the sliding disc 34 and the first sliding surface 29 and / or between the sliding disc 34 and the second sliding surface 30. Furthermore, grooves 28 (see Figure 3) can be arranged in the sliding disc 34. Advantageously, the sliding disc 34 allows for better adjustment of the frictional torque between the bearing 17 and the spray arm 18. The freely rotating sliding disc 34 can further increase the probability of dirt particle discharge from the sliding plane 20.

[0112] Figure 6 shows the third embodiment of the bearing-spray arm arrangement 15. For example, an annular groove 35 is formed on the bearing journal 26 of the bearing 17. The annular groove 35 can be formed in an outer circumferential surface of the bearing journal 26. Furthermore, the annular groove 35 can be connected to the groove 28, particularly fluidically, so that the flushing solution 22 can be guided from the cavity 24 into the flushing chamber 4 by means of the groove 28 and the annular groove 35. The annular groove 35 extends along a circumference in the outer circumferential surface of the bearing journal 26.

[0113] Fig. 7 shows the fourth embodiment of the bearing-spray arm arrangement 15. The bearing journal 26 can include a further groove 36. The further groove 36 is, for example, arranged in the outer cylindrical surface of the bearing journal 26. The groove 28 and the further groove 36 can form a fluidic connection between the cavity 26 and the 202402708

[0114] 15 / 21

[0115] The rinsing chamber 4 is formed. The rinsing solution 22 can be directed from the cavity 24 into the rinsing chamber 4 by means of the groove 28 and the further groove 36. The further groove 36 extends, for example, along the axis of rotation 19.

[0116] Fig. 8 shows steps of a method for flushing dirt particles out of the sliding plane 20.

[0117] By directing the washing liquid 22 through the nozzle 21 during the operation of the household dishwasher 1, the spray arm 18 rotates in a first step S1 about the axis of rotation 19. In this process, it slides in the sliding plane 20 which is arranged perpendicular to the axis of rotation 19.

[0118] When the wash water 22 is directed into the wash chamber 4 by means of the nozzle 21, dishes soiled with dirt particles, for example, which are arranged on one of the dish holders 12 to 14, can be cleaned. The wash water 22 can pick up the dirt particles. A pump in the household dishwasher 1 can direct the wash water 22 with the dirt particles via the inlet 16 into the cavity 24. If the dirt particles are deposited in the sliding plane 20, they can generate a frictional torque and thus prevent or impede the rotation of the spray arm 18.

[0119] With the help of the flushing solution 22, in a second step S2, while the spray arm 18 rotates in the first step S1, the at least one groove 28, which extends tangentially t or radially r in the sliding plane 20 with respect to the axis of rotation 19, is flushed.

[0120] This allows, for example, dirt particles from the sliding plane 20 to be flushed out of the sliding plane 20 into the rinsing chamber 4 with the help of the groove 28, thereby reducing the frictional torque caused by the dirt particles and enabling a constant rotation of the spray arm 18.

[0121] Although the present invention has been described using exemplary embodiments, it can be modified in many ways. 202402708

[0122] 16 / 21

[0123] Reference symbols used:

[0124] 1 household dishwasher, 2 wash tubs

[0125] 3 Door

[0126] 4 wash chambers

[0127] 5 swivel axes

[0128] 6 Feed opening

[0129] 7 Floor

[0130] 8 ceiling

[0131] 9 Back panel

[0132] 10 side wall

[0133] 11 Side wall

[0134] 12-14 dish capacity

[0135] 15 Bearing-spray arm arrangement 16 Inlet

[0136] 17 warehouses

[0137] 18 spray arm

[0138] 19 axis of rotation

[0139] 20 Slip plane

[0140] 21 nozzle

[0141] 22 flushing solution

[0142] 23 Passage opening

[0143] 24 Cavity

[0144] 25 Rotational movement

[0145] 26 bearing journals

[0146] 27 flange

[0147] 28, 28' Nut

[0148] 29 first sliding surface

[0149] 30 second sliding surface

[0150] 31, 31' center axis

[0151] 32 Opening

[0152] 33 Entrance opening

[0153] 34 Sliding disc 202402708

[0154] 17 / 21

[0155] 35 Ring groove

[0156] 36 more grooves

[0157] A Extraction direction

[0158] E Insertion direction

[0159] r radial direction

[0160] R radius

[0161] 51 Rotate the spray arm around the axis of rotation. 52 Flush at least one groove with rinsing solution in a tangential direction.

[0162] U Scope

[0163] a angle

Claims

202402708 18 / 21 PATENT CLAIMS 1. Bearing-spray arm arrangement (15) for a household dishwasher (1), comprising a spray arm (18) and a bearing (17) which rotatably supports the spray arm (18) about an axis of rotation (19), wherein a sliding plane (20) is formed between the bearing (17) and the spray arm (18), which is arranged perpendicular to the axis of rotation (19), wherein at least one groove (28, 28') is provided which extends tangentially (t) or radially (r) in the sliding plane (20).

2. Bearing-spray arm arrangement (15) according to claim 1, characterized in that the bearing (17) has a sliding surface (29) on which a corresponding sliding surface (30) of the spray arm (18) is supported, wherein the at least one groove (28, 28') is formed in the sliding surface (29) and / or in the corresponding sliding surface (30).

3. Bearing-spray arm arrangement (15) according to claim 1, characterized by a sliding disc (34) which is arranged between a sliding surface (29) of the bearing (17) and a corresponding sliding surface (30) of the spray arm (18), wherein the at least one groove (28, 28') is formed in the sliding surface (29), in the corresponding sliding surface (30) or in the sliding disc (34).

4. Bearing-spray arm arrangement (15) according to one of claims 1 to 3, characterized in that the bearing (17) has an axial through-opening (23) which is configured to introduce rinsing liquor (22) into the spray arm (18), and which has at least one groove (28, 28') configured to direct rinsing liquor (22) from the spray arm (18) into a rinsing chamber (4) of the household dishwasher (1).

5. Bearing-spray arm arrangement (15) according to one of claims 2 to 4, characterized in that the bearing (17) has a flange (27) which comprises the sliding surface (29), wherein the at least one groove (28, 28') extends at one end through an outer circumference (U) of the flange (27). 19 / 21 6. Bearing-spray arm arrangement (15) according to claim 5, characterized in that the bearing (17) has a bearing journal (26) connected to the flange (27), wherein the bearing journal (26) has a further groove (35, 36) into which the groove (28, 28') opens at its other end.

7. Bearing-spray arm arrangement (15) according to claim 6, characterized in that the further groove (36) extends parallel to the axis of rotation (19) and / or the further groove (36) is designed as an annular groove coaxial to the axis of rotation (19).

8. Bearing-spray arm arrangement (15) according to one of claims 2 to 7, characterized in that the at least one groove (28, 28') extending in the sliding surface (29), the corresponding sliding surface (30) or the sliding disc (34) is closed at least sectionally on its circumference by the respective other sliding surface (29, 30) or the sliding disc (34).

9. Bearing-spray arm arrangement (15) according to one of claims 5 to 8, characterized in that the spray arm (18) surrounds the flange (27) of the bearing (17).

10. Bearing-spray arm arrangement (15) according to one of claims 1 to 9, characterized in that the at least one groove (28, 28') which extends tangentially (t) is tilted relative to a radius (R) on the axis of rotation (19) such that an opening (32) of the at least one groove (28, 28') points towards the direction of rotation (25) of the spray arm (18) during operation of the household dishwasher (1).

11. Bearing-spray arm arrangement (15) according to claim 10, characterized in that the at least one groove (28, 28') which extends tangentially (t) has an angle (a) of at least 30 degrees, preferably at least 60 degrees, with the radius (R) to the axis of rotation (19).

12. Bearing-spray arm arrangement (15) according to one of claims 1-11, characterized in that at least three, preferably at least or exactly four grooves (28, 28') are provided. 202402708 20 / 21 13. Household dishwasher (1) with a bearing-spray arm arrangement (15) according to one of claims 1 - 12.

14. Method for rinsing dirt particles from a sliding plane (20) between a bearing (17) and a spray arm (18) in a household dishwasher (1), wherein the spray arm (18) is rotatably mounted on the bearing (17) about an axis of rotation (19), comprising the steps: a) Rotating (S1) the spray arm (18) about the axis of rotation (19), wherein the sliding plane (20) is arranged perpendicular to the axis of rotation (19); and b) Flushing (S2) at least one groove (28, 28') which extends tangentially (t) or radially (r) in the sliding plane (20) with respect to the axis of rotation (19) with flushing fluid (22) in the tangential or radial direction (t, r) during step a).

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