EP3574818B1 - Device for the rotatable mounting of a spray arm - Google Patents

Description

The invention relates to a device for the rotatable mounting of a spray arm of a dishwasher.

Dishwashers as such are well known per se from the prior art, so that separate printed evidence is not required at this point.

Dishwashers of the previously known type typically have a rinsing container that provides a rinsing space. This rinsing chamber is accessible to the user via a loading opening which can be closed in a fluid-tight manner by means of a pivotably mounted rinsing chamber door. When used as intended, the washing compartment serves to hold items to be cleaned.

In order to apply washing liquid, the so-called washing liquor, to items to be washed to be cleaned, the dishwasher has a spray device inside the washing compartment. As a rule, this spray device provides rotatably mounted spray arms, with typically two or three such spray arms being provided. In the case of intended use, the items to be cleaned are subjected to washing liquor by means of rotating spray arms.

For the rotatable mounting of a spray arm, plain bearings have become known from the prior art, which have a spray arm-side ring or a spray arm-side disk that provides the sliding surface. The washer on the spray arm thus represents the interface between the spray arm and an inflow pipe provided for supplying the spray arm with dishwashing liquid. Practice has shown that impurities, particles and/or similar dirt in the washing water can become lodged in the slide bearing, which can lead to undesirably high wear of the slide bearing and, in the worst case, to a blockage in the rotary movement of the spray arm. The rinsing result that is desirable to be achieved by carrying out a rinsing program can then, disadvantageously, no longer be achieved.

Furthermore, as an alternative to plain bearings, an axle bearing is known from the prior art. Accordingly, an axle is used for mounting a spray arm, which is fastened via webs in the washing liquor inflow pipe and protrudes through a slide bushing provided by the spray arm. For a secure position of the spray arm on the axis, a knurled nut is provided, which is screwed onto the end of the spray arm projecting axis, which prevents the spray arm from lifting off the axis. Such an axle bearing offers the advantage of low susceptibility to contamination compared to a sliding bearing. The disadvantage, however, is the comparatively high leakage flow, since leakages occur both between the axle and slide bushings and between the feed pipe and spray arm. In addition, due to the knurled nut provided to prevent the spray arm from being lifted off, the axle bearing is relatively high in the vertical direction, which reduces the space in the wash cabinet for items to be washed. In addition, due to the design, the knurled nut prevents the spray nozzle from forming in the middle of the spray arm.

The DE 87 01 488 B1 describes an axial plain bearing seal in which a bearing sleeve is inserted into the outlet port of a liquid supply line and is fastened by means of a nut. In its passage opening, the bearing sleeve has a spider with a bearing pin which is fastened to the spray arm, projecting through it.

The U.S. 2,905,393 A describes an axle bearing with a cap-like closure means which is placed at the end on the axle projecting through the spray arm to prevent the spray arm from being lifted off the axle.

The U.S. 5,924,432 A describes a water distribution device arranged in the area of the spray arm axis, which directs the washing liquor either into the lower spray arm or to the upper spray arm, depending on the direction of rotation of the circulating pump.

Proceeding from the above, it is the object of the invention to propose a device for the rotatable mounting of a spray arm of a dishwasher, which is little or not at all susceptible to soiling, is not very tall in the vertical direction and, moreover, contributes to generating a homogeneous spray pattern over the entire length of a spray arm can.

To solve this problem, a device is proposed with the invention rotatable mounting of a spray arm of a dishwasher with the features of claim 1.

The device according to the invention represents an axle bearing. It has a first sleeve body and a second sleeve body, the two sleeve bodies being arranged such that they can be rotated relative to one another, specifically by means of an axle body which rotatably couples the two sleeve bodies to one another. In a departure from the prior art, the device according to the invention therefore does not propose a plain bearing, but rather an axle bearing, which has the advantage that the spray arm bearing is basically insensitive to dirt, particles and/or similar dirt carried along by the washing liquor is. The device according to the invention thus proves to be low-wear and in particular offers the advantage that spray arm blockages caused by dirt, particles and/or similar dirt carried along by the washing liquor are reliably ruled out.

Both sleeve bodies each have a throughflow channel, with the two throughflow channels being designed to correspond to one another. When used as intended, the device can therefore be flowed through by rinsing liquid, so that the rinsing liquid fed in from an inflow pipe can flow through the device and reach the spray arm for the purpose of distribution to the items to be cleaned.

The construction according to the invention also provides that the first sleeve body is arranged on one end of the axle body and the second sleeve body is arranged on the other end of the axle body, in such a way that they are each axially fixed relative to the axle body in a direction that points away from the other sleeve body. The first sleeve body is thus fixed axially on the axle body in a direction pointing axially away from the second sleeve body, and the second sleeve body in the opposite direction thereto.

The axial fixing of the sleeve body on the axle body has the advantage that no axle projecting through the spray arm, including a knurled nut provided on the outside of the rinsing arm, is required for a secure arrangement of the spray arm on the device according to the invention. Rather, the axial fixing of the sleeve body on the axle body makes it possible to use the part of the device according to the invention on the spray arm side to be arranged within the interior provided by the spray arm, which ensures a penetration-free arrangement of the device on the spray arm with the advantage that the device according to the invention is comparatively small in height. In addition, in this context, there is also the advantageous fact that, since the spray arm does not penetrate the axle, there is a reduced tendency to leak compared to previously known axle bearings. This is because the rinsing liquid flowing through the device through the flow channels reaches the interior space provided by the spray arm directly, without, in contrast to previously known axle bearings, there being a leakage point as a result of an axle breakthrough.

In the absence of an axis projecting through the spray arm, the device according to the invention also has the advantage that the spray arm can be equipped with a centrally aligned spray nozzle, which contributes to generating a spray pattern that is homogeneous over the entire length of the spray arm.

When used as intended, the spray arm is loaded with washing liquid, which results in the spray arm being pressurized. This pressurization causes the spray arm to expand, in particular in the vertical direction, i.e. to bulge, which must be taken into account in previously known spray arm bearings by selecting an appropriate gap dimension in order to prevent the spray arm from becoming stuck when pressure is applied accordingly. This gap dimension, which is to be provided structurally in the case of previously known bearings, causes a leakage that cannot be avoided. This problem is not inherent in the device according to the invention. Because the full integration of the part of the device according to the invention on the spray arm within the spray arm means that any spray arm expansions due to pressurization are independent of the spray arm bearing, which is why corresponding gap dimensions are not necessary for the purpose of tolerance compensation in the device according to the invention. The leakage that occurs during operation is thus reduced to a minimum with the configuration according to the invention.

In the final assembled state, the first sleeve body is used to arrange the device on the spray arm. The second sleeve body is located on the pivot, which is typically the feed tube for the spray arm. Since both sleeve bodies are rotatable relative to each other thanks to the axle body, there is an overall rotatable arrangement of the spray arm relative to the abutment, ie the feed pipe for the spray arm. The bearing designed in this way is low-wear, comparatively less susceptible to contamination, minimizes leakage and is also designed in such a way that a spray nozzle can be arranged centrally on the spray arm. The device according to the invention thus proves to be advantageous overall compared to previously known slide and/or axle bearings.

According to a further feature of the invention, it is provided that the two sleeve bodies are supported in relation to one another in the axial direction of the axle body.

The two sleeve bodies are each fixed axially relative to the axle body in a direction pointing away from the respective other sleeve body. In a further development of the invention, the two sleeve bodies also support one another in the axial direction, with the result that each sleeve body is secured axially, specifically in both axial directions of the axle body. Each sleeve body is thus supported on the axle body in one of the two axial directions itself and is supported by the adjacent sleeve body with respect to the other axial direction. This ensures that the two sleeve bodies are completely secured axially on the axle body.

As an alternative or in addition to this configuration, it can be provided that the sleeve bodies are each supported on the axle body in both axial directions. Mutual support of the two sleeve bodies is then not required, although such mutual support can nevertheless be provided.

According to a further feature of the invention, it is provided that the axle body has a bolt with a head part arranged thereon at one end, the head part protruding beyond the bolt in the radial direction and providing a bearing surface on the bolt side.

According to this embodiment, the axle body has a bolt. This bolt protrudes through the two sleeve bodies. At one end, the bolt is equipped with a head part, the head part projecting beyond the bolt in the radial direction, which provides a stop. One of the two sleeve bodies rests against this stop, which means that the sleeve body is fixed axially in the direction of the head part.

According to a further feature of the invention, the first sleeve body has a Guide sleeve, which serves to accommodate the bolt of the axle body. The edge of the guide sleeve facing the head part is assigned to the contact surface provided by the head part. In the final assembled state, the sleeve body is in contact with the edge of its guide sleeve against the contact surface of the head part, which means that the sleeve body is supported in the direction of the head part and thus that the sleeve body is axially secured relative to the axle body in the direction of the head part.

According to a further feature of the invention, it is provided that the axle body has a bolt with an annular groove formed on the other end. This annular groove serves to axially support the second sleeve body. For this purpose it is provided that the second sleeve body has a guide sleeve for receiving the bolt, the guide sleeve providing a latching device which interacts with the annular groove. In the final assembled state, this latching device engages in the annular groove of the axle body, which means that the second sleeve body is fixed axially relative to the axle body.

According to a further feature of the invention, it is provided that the locking device has resiliently pivotable locking arms, each with a locking cam on the ring groove side. Accordingly, the latching device has a plurality of latching arms which are arranged in a resiliently pivotable manner on the guide sleeve of the second sleeve body. Remote from the sleeve body, each latch arm provides a latch cam. This acts together with the annular groove on the side of the axle body and engages in this in the final assembled state, whereby the axial securing of the second sleeve body relative to the axle body is provided.

According to a further feature of the invention, it is provided that the bolt has a radial shoulder, which creates a first and a second section in the axial direction, with the first section being assigned to the guide sleeve of the first sleeve body and the second section being assigned to the guide sleeve of the second sleeve body .

The optionally provided radial section serves to additionally fix the position of the sleeve body in the axial direction. It can be provided, in particular, that the second sleeve body bears against the radial shoulder, and this with the simultaneous action of the latching device on the annular groove on the side of the axle body. The radial section also serves as an assembly aid. The second sleeve body can thus rest against the radial shoulder are brought up and slipped over the axle body. In this end position, the latching device then latches with the annular groove on the side of the axle body, so that the sleeve body is secured axially relative to the axle body. Before mounting the second sleeve body, the first sleeve body is to be applied to the axle body, so that after the second sleeve body has reached the end position, the first sleeve body is also fixed in a secure position on the axle body.

According to a further feature of the invention, it is provided that the first sleeve body and the second sleeve body each have an annular part surrounding the respective guide sleeve. In this case, a guide sleeve and the associated ring part are coupled to one another by means of webs, which webs provide the flow channels for the rinsing liquid between them.

The ring parts have sides facing one another, which in the final assembled state engage one another in a form-fitting manner, for which purpose the sides of the ring parts facing one another have corresponding counter-contours. In this case, it is provided that the counter-contours, which engage in one another in a form-fitting manner, form a radially running through-flow channel for flushing liquid between them. When used as intended, the two ring parts of the sleeve body rotate against each other. In this respect, a flow gap for rinsing liquid cannot be avoided. According to the invention, it is now provided that the ring parts have counter-contours which engage in one another in a form-fitting manner. This creates a labyrinth guide that minimizes unavoidable leakage. It is preferred that the flow channel tapers in the radial direction towards the axle body. As a result, blockages of the flow channel caused by particles, dirt and/or similar dirt can be avoided. Because the configuration of the flow channel that tapers in the direction of the flow body ensures that particles, dirt and/or similar impurities that get into the flow channel also pass through the flow channel and can flow out of it again on the outlet side.

According to a further feature of the invention, it is provided that the first sleeve body provides means for arrangement on the spray arm. This means is preferably a thread provided on the outside of the sleeve body, which engages in a counter-thread provided by the spray arm in the final assembled state. It is therefore given in the final assembled state a screw connection between the first sleeve body of the device according to the invention and the spray arm.

According to a further feature of the invention, it is provided that the first sleeve body is formed from PVDF (polyvinylidene fluoride). Such a plastic material is comparatively inexpensive, but at the same time thermally and chemically stable, which is advantageous for use within the washing chamber of a dishwasher.

According to a further feature of the invention, it is provided that the second sleeve body has means for arrangement on an abutment. Such a means can preferably be a bayonet ring which is rotatably arranged on the second sleeve body. A bayonet lock is provided on the abutment side, by means of which the bayonet ring can be detachably arranged on the abutment. PEEK (polyetheretherketone) is particularly suitable as the material for the second sleeve body. This plastic is a high-temperature-resistant plastic that is unbreakable and, in particular, resistant to chemical stress.

With the device according to the invention, an axle bearing is proposed overall, which is integrated into the spray arm without penetrating it and protrudes into the interior space provided by the spray arm. This reduces leakage by eliminating a continuous axis. In addition, a central, i.e. near-axis nozzle placement is possible, which allows an overall homogeneous spray pattern. Leeches on the outer edge of the bearing are reduced by a labyrinth guide. The gap in the labyrinth guide increases from the inside to the outside to ensure that penetrating particles can be flushed out again. The guide sleeves and ring parts provided by the respective sleeve bodies are each formed in one piece, so that overall smaller gap dimensions can be realized. Furthermore, by integrating the bearing into the spray arm, a minimized overall height is achieved, so that the height that can be used for the items to be washed is maximized.

Fig. 1

in rein schematischer Darstellung eine Geschirrspülmaschine;

Fig. 2

in schematisch perspektivischer Ansicht eine erfindungsgemäße Vorrichtung;

Fig. 3

in schematisch perspektivischer Schnittdarstellung eine erfindungsgemäße Vorrichtung;

Fig. 4

ausschnittsweise in geschnittener Darstellung eine an einem Sprüharm angeordnete erfindungsgernäße Vorrichtung;

Fig 5

in schematischer Schnittdarstellung eine erfindungsgemäße Vorrichtung;

Fig. 6

in schematischer Perspektivdarstellung eine an einem Sprüharm angeordnete erfindungsgemäße Vorrichtung gemäß einer ersten Ausführungsform und

Fig. 7

in schematischer Perspektivdarstellung eine an einem Sprühärm angeordnete erfindungsgemäße Vorrichtung gemäß einer zweiten Ausführungsform.

Further features and advantages of the invention result from the following description based on the figures. show it

1

a dishwasher in a purely schematic representation;

2

a schematic perspective view of a device according to the invention;

3

a schematic perspective sectional view of a device according to the invention;

4

a fragmentary sectional view of a device according to the invention arranged on a spray arm;

figure 5

a schematic sectional view of a device according to the invention;

6

a schematic perspective view of a spray arm arranged on a device according to the invention according to a first embodiment and

7

a schematic perspective view of a device according to the invention arranged on a spray arm according to a second embodiment.

1 shows, in a purely schematic representation, a dishwasher 1 known per se from the prior art, which can be embodied as a domestic dishwasher or as a cleaning and/or disinfecting machine for industrial purposes.

In a manner known per se, the dishwasher 1 has a housing 2 which accommodates a washing container 3 . The rinsing compartment 3 in turn provides a rinsing space 4 which is used to accommodate items to be washed that are to be cleaned. The washing compartment 3 has a loading opening 5 for loading the washing compartment 4 with items to be washed.
In the intended use case, the items to be cleaned are treated with washing liquor, for which purpose the dishwasher 1 has a spray device. In the exemplary embodiment shown, the spray device includes an upper spray arm 7 and a lower spray arm 8. The spray arms 7 and 8 are each rotatably mounted, with the upper spray arm 7 being able to rotate about the axis of rotation 9 and the lower spray arm 8 about the axis of rotation 10.

For the rotatable mounting of the spray arms 7 and 8 is used in each case a device 11 according to the invention, as in the following Figures 2 to 7 is shown in different views.

How in particular a synopsis of Figures 2, 3 and 5 can be seen, the device 11 according to the invention for the rotatable mounting of a spray arm 7 or 8 has a first sleeve body 12 and a second sleeve body 13. The two sleeve bodies 12 and 13 each provide a flow channel, namely the first sleeve body 12 the flow channel 14 and the second sleeve body 13 the flow channel 15. The two flow channels 14 and 15 are designed to correspond to one another, so that when used as intended, rinsing liquid discharged from an inflow pipe can flow through the flow channels 14 and 15 in the direction of the spray arm 7 or 8 connected to the device 11 according to the invention , like this a synopsis of figures 6 and 7 reveals.

The device 11 according to the invention also has an axle body 16. This couples the two sleeve bodies 12 and 13 to one another in such a way that the two sleeve bodies 12 and 13 can be rotated relative to one another, specifically about an axis of rotation defined by the axle body 16

According to the invention, the first sleeve body 12 is arranged on one end of the axle body 16 and the second sleeve body 13 is arranged on the other end of the axle body 16, as shown in particular in FIG figure 5 reveals. The two sleeve bodies 12 and 13 are each fixed axially relative to the axle body 16 in a direction 18 or 19 pointing away from the respective other sleeve body 12 or 13 .

The axle body 16 has a bolt 20 with a head part 21 arranged thereon at one end, the head part 21 protruding beyond the bolt 20 in the radial direction and providing a bearing surface 22 on the bolt side, as can be seen in particular from the Figures 3 and 5 reveals. At the other end, the bolt 20 is formed with a circumferential annular groove 23, which is also particularly evident from a synopsis of the Figures 3 and 5 results.

The sleeve bodies 12 and 13 each have a guide sleeve for receiving the bolt 20, the first sleeve body 12 having the guide sleeve 24 and the second Sleeve body 13 has the guide sleeve 26 . In the final assembled state, the axle body 16 protrudes through the two sleeve bodies 12 and 13, with the bolt 20 of the axle body 16 being guided through the guide sleeves 24 and 26, as is shown in the sectional view figure 5 shows.

As can be seen from this in particular figure 5 results, the guide sleeve 24 rests with its head part-side edge 25 in the final assembled state on the contact surface 22 of the head part 21. The first sleeve body 12 is thus fixed axially in the direction of the arrow 18 relative to the axle body 16 .

The second sleeve body 13 has a guide sleeve 26 which has a latching device 27 which interacts with the annular groove 23 of the axle body 16 . For this purpose, the latching device 27 has latching arms 28 which, in the final assembled state, engage in the annular groove 23 with latching cams 29 arranged thereon. In this way, the second sleeve part 13 is fixed axially relative to the axle body 16, both in the direction of arrow 19 and in the direction of arrow 18. The second sleeve body 13 is thus fixed overall in the axial direction 17 in relation to the axle body 16 on the latter.

The two sleeve bodies 12 and 13 are supported in the axial direction 17 of the axle body 16 with respect to one another. This results in an overall axial securing in the axial direction 17 of both sleeve bodies 12 and 13 in relation to the axle body 16.

According to the exemplary embodiment shown, the axle body 16 has a radial shoulder 30. A first section 31 and a second section 32 of the bolt 20 are thus provided. The length of the first section 31 in the axial direction 17 corresponds to the length of the guide sleeve 24 of the first sleeve body 12 in the axial direction 17, which factual relationship is evident in particular from the illustration figure 5 results.

For the purpose of assembling the device 11 according to the invention, the first sleeve body 12 must first be placed on the axle body 16 in the axial direction 18, to the extent that the edge 25 provided by the guide sleeve 24 comes to rest on the contact surface 22 of the head part 21. Then the second sleeve body 13 is to be placed on the axle body 16, to be precise in the axial direction 18 so far that it comes to rest against the shoulder 30 in abutment. In this position of the sleeve body 13, the rest of the locking arms 28 carried latching cam 29 in the corresponding provided by the axle body 16 annular groove 23, whereby the above-described axial fixing of the two sleeve bodies 12 and 13 relative to the axle body 16 is given.

The two sleeve bodies 12 and 13 each have a ring part 33 and 34 , the first sleeve body 12 having the ring part 33 and the second sleeve body 13 having the ring part 34 . The ring parts 33 and 34 are connected to the associated guide sleeves 24 and 26 via webs 35 and 36, respectively. The first sleeve body 12 therefore has a guide sleeve 24 and a ring part 33, the guide sleeve 24 and the ring part 33 being connected to one another with the interposition of the webs 35. The second sleeve body 13 is designed in a corresponding manner, which has the guide sleeve 26 and the ring part 34 which are connected to one another with the interposition of the webs 36 . The space between the webs 35 and 36 defines the flow channels 14 and 15.

The opposing ring part sides 37 and 38 of the ring parts 33 and 34 are each formed with a counter-contour 39 or 40, which are formed to correspond to one another, so that in the final assembled state of the device 11 there is a labyrinth guide 41, as can best be seen from FIG representation after figure 5 results. This labyrinth guide 41 extends in the radial direction and represents a flow channel 42 which extends outwards starting from the axle body 16 . The flow channel 42 tapers in the direction of the axle body 16, as is also shown in the drawing figure 5 best seen.

For arranging the device 11 on a spray arm 7 or 8, the first sleeve body 12 has appropriate means 43, which are a thread in the exemplary embodiment shown. For example, the figures 4 and 6 recognize.

The figures 4 and 6 show the arrangement of the device 11 according to the invention on an upper spray arm 7. In a manner known per se, the spray arm 7 has an upper half-shell 47 and a lower half-shell 48, which define an interior space 46 in the fully assembled state. The upper half-shell 47 is equipped with a threaded opening 45, as is shown, for example, in FIG 4 reveals. The first sleeve body 12 of the device 11 according to the invention is inserted into this threaded opening 45 used and fixed in position by means of its thread 43. In the final assembled state, the first sleeve body 12 is therefore arranged on the spray arm 7 in a rotationally fixed manner.

To fix the device 11 according to the invention on an abutment 49, for example on an inflow pipe, as shown in the illustration 6 can be seen, the second sleeve body 13 is equipped with means 44, which is a bayonet ring 44 in the illustrated embodiment. The abutment 49 is equipped with a corresponding counter-contour, which allows the bayonet ring 44 to be fixed. The bayonet ring 44 can be arranged on the abutment 49 with the interposition of a seal. In the final assembled state, the second sleeve body 13 is preferably arranged on the abutment 49 in a rotationally fixed manner.

Since the two sleeve bodies 12 and 13 are rotatable relative to one another due to their arrangement on the axle body 16 , a twisting movement of the spray arm 7 in relation to the abutment 49 can take place when used as intended. The axial securing of the two sleeve bodies 12 and 13 on the axle body 16 according to the invention ensures that the device 11 according to the invention is comparatively small in the height direction, i.e. in the axial direction 17, which allows the part of the device 11 on the spray arm to be accommodated by the interior 46 of the spray arm. the axle body 16 therefore does not protrude through the spray arm 7, in contrast to the prior art.

When used as intended, the spray arm 7 is fed with washing liquor via the inflow pipe. The washing water flows through the flow channels 14 and 15 provided by the device 11 and thus reaches the interior space 46 provided by the spray arm 7 which there is a leakage of flushing liquid. Due to the axial fixing of the sleeve bodies 12 and 13 on the axle body 16, the gap in the flow channel 42 is minimized, which also minimizes the leakage flow. Since the flow channel 42 widens outwards in the radial direction, it is also ensured that unwanted blockages of the flow channel 42 are avoided. This is because particles, dirt and/or similar contaminants that get into the flow channel 42 on the inlet side can safely leave the flow channel 42 again due to the widening of the flow channel 42 in the radial outward direction.

7 shows the rotatable arrangement of the lower spray arm 8 on an abutment 49. For this purpose, an identical configuration follows 6 Device 11 used is used, only the connecting pipe serving as an abutment 49 for supplying the spray arm 8 with rinsing liquid is designed differently. However, the bayonet ring 44 provided by the device 11 is used in the same way for arrangement on this connection pipe.

Reference sign

1

dishwasher

2

Housing

3

flush tank

4

dishwashing room

5

loading opening

6

scullery door

7

upper spray arm

8th

lower spray arm

9

axis of rotation

10

axis of rotation

11

contraption

12

first sleeve body

13

second sleeve body

14

flow channel

15

flow channel

16

axle body

17

axial direction

18

Arrow

19

Arrow

20

bolt

21

headboard

22

contact surface

23

ring groove

24

guide sleeve

25

border edge

26

guide sleeve

27

locking device

28

locking arm

29

locking cam

30

Unit volume

31

first section

32

second part

33

ring part

34

ring part

35

web

36

web

37

ring part side

38

ring part side

39

counter contour

40

counter contour

41

maze guide

42

flow channel

43

medium (thread)

44

medium (bayonet ring)

45

threaded opening

46

inner space

47

upper half shell

48

lower half shell

49

abutment

Claims (15)

1. Device for rotatably mounting a spray arm (7, 8) of a dishwasher, the device comprising a first sleeve body (12) and a second sleeve body (13), wherein the first sleeve body (12) provides means for arranging the device on the spray arm (7, 8), and the second sleeve body (13) provides means for arranging the device on an abutment (49), specifically the feed pipe for the spray arm (7, 8), wherein the first and second sleeve bodies (12, 13) provide mutually corresponding through-flow channels (14, 15) for rinsing fluid, and comprising an axle body (16), which twistably couples the two sleeve bodies (12, 13) to one another to form an axle bearing of the spray arm (7, 8) without passing through the spray arm (7, 8), wherein, in each case on the axle body (16), the first sleeve body (12) is supported on one end of the axle body (16) and the second sleeve body (13) is supported on the other end of the axle body (16) and, as a result, are each axially fixed with respect to the axle body (16) in a direction pointing away from the respective other sleeve body (12, 13).
2. Device according to claim 1,
   characterised in that
   the two sleeve bodies (12, 13) are supported against one another in the axial direction (17) of the axle body (16).
3. Device according to either claim 1 or claim 2,
   characterised in that
   the axle body (16) comprises a pin (20) that has a head part (21) arranged on an end thereof, the head part (21) protruding beyond the pin (20) in the radial direction and providing a pin-side contact surface (22).
4. Device according to claim 3,
   characterised in that
   the first sleeve body (12) has a guide sleeve (24) for receiving the pin (20), the peripheral edge (25) of the guide sleeve (24) facing the head part (21) being associated with the contact surface (22) provided by the head part (21).
5. Device according to claim 4,
   characterised in that
   the axle body (16) has a pin (20) that has an annular groove (23) formed at the other end.
6. Device according to claim 5,
   characterised in that
   the second sleeve body (13) has a guide sleeve (26) for receiving the pin (20), the guide sleeve (26) providing a latching means (27) which interacts with the annular groove (23).
7. Device according to claim 6,
   characterised in that
   the latching device (27) has resiliently pivotable latching arms (28) which each have a latching cam (29) on the annular groove side.
8. Device according to any of the preceding claims 6 to 7,
   characterised in that
   the pin (20) has a radial shoulder (30), whereby a first and a second portion (31, 32) are provided in the axial direction, the first portion (31) being associated with the guide sleeve (24) of the first sleeve body (12) and the second portion (32) being associated with the guide sleeve (26) of the second sleeve body (13).
9. Device according to any of the preceding claims 6 to 8,
   characterised in that
   the first sleeve body (12) and the second sleeve body (13) each have an annular part (33, 34) surrounding the respective guide sleeve (24, 26).
10. Device according to claim 9,
    characterised in that
    the mutually facing sides (37, 38) of the annular parts (33, 34) provide interlockingly engaging mating contours (39, 40).
11. Device according to claim 10,
    characterised in that
    the interlockingly engaging mating contours (39, 40) form between them a radially extending through-flow channel (42) for rinsing fluid.
12. Device according to claim 11,
    characterised in that
    the through-flow channel (42) tapers in the radial direction towards the axle body.
13. Device according to any of the preceding claims,
    characterised in that
    the first sleeve body (12) is formed from PVDF.
14. Device according to any of the preceding claims,
    characterised in that
    the means for arrangement on an abutment (49) is a bayonet ring (44) arranged on the second sleeve body (13).
15. Device according to any of the preceding claims,
    characterised in that
    the second sleeve body (13) is formed from PEEK.

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