CN111286923B

CN111286923B - Household appliance for articles of care clothing with additional spring element drive pulleys

Info

Publication number: CN111286923B
Application number: CN201911240270.9A
Authority: CN
Inventors: R·比蒂高; R·瓦尔特; T·韦伯
Original assignee: BSH Hausgeraete GmbH
Current assignee: BSH Hausgeraete GmbH
Priority date: 2018-12-07
Filing date: 2019-12-06
Publication date: 2023-08-15
Anticipated expiration: 2039-12-06
Also published as: PL3663453T3; EP3663453B1; EP3663453A1; DE102018221208A1; CN111286923A

Abstract

The application relates to a household appliance for caring for clothing items, comprising a clothing drum comprising a drive shaft (4) and a drive pulley (8), wherein the drive pulley (8) can be rotated about a rotation axis (A) of the drive pulley (8) by means of a drive belt drive of the household appliance. The drive pulley (8) is connected to the drive shaft (4) in a rotationally fixed manner, and the hub (9) of the drive pulley (8) has at least one form-locking element (10), the at least one form-locking element (10) being in engagement with at least one corresponding form-locking element (10) of the drive shaft (4). At least one form-locking element (10) of the hub (9) extends in the direction of the rotational axis (A) as far as into a region (16) of the hub (9), in which region (16) a spring element (15) is arranged on the hub (9).

Description

Household appliance for articles of care clothing with additional spring element drive pulleys

Technical Field

The present application relates to a household appliance for caring for articles of clothing, said household appliance having a laundry drum comprising a drive shaft and a pulley/belt drum (Riemenscheibe). The drive pulley is rotatable about a rotation axis of the drive pulley by means of a drive belt drive of the household appliance. The drive pulley is connected to the drive shaft in a rotationally fixed manner (drehfest). The hub of the drive pulley has at least one form-locking element which cooperates with at least one corresponding form-locking element of the drive shaft.

Background

Such a household appliance is described, for example, in EP 2 557,219 A1. The drive shaft has a toothing, which engages into a corresponding toothing formed in the hub of the drive pulley.

In addition, in a household appliance, for example, configured as a front-loading washing machine, the drive pulley can have an insert in the region of its hub, which insert is made of steel and thus of a harder material than the rest of the drive pulley. By providing such an insert with a hub (or such an insert made of steel), torque is transmitted to the drive shaft by means of the teeth of such a steel insert when driving the drive pulley, i.e. when the drive pulley rotates about its rotational axis.

The disadvantage here is that the provision of an insert made of steel in the drive pulley is accompanied by higher effort and higher costs.

Disclosure of Invention

The object of the present application is therefore to provide a household appliance for caring for clothing items, in which torque can be transmitted from a drive pulley to a drive shaft with particularly little effort.

This object is achieved by a household appliance having the features according to the application. Advantageous embodiments with the targeted development of the application are given in the detailed description.

The household appliance for caring for clothing items according to the application has a laundry drum comprising a drive shaft and a drive pulley which is rotatable about a rotation axis of the drive pulley by means of a drive belt drive of the household appliance. The drive pulley is connected in a rotationally fixed manner to the drive shaft. The hub of the drive pulley has at least one form-locking element which cooperates with at least one corresponding form-locking element of the drive shaft. The at least one form-locking element of the hub extends in the direction of the rotational axis up to such a region of the hub: in this region, the spring element is arranged on the hub. That is to say that the at least one form-locking element of the hub and thus of the drive pulley has a particularly large length in the direction of the axis of rotation. In this way, torque can be transmitted well from the drive pulley driven by the drive belt drive to the drive shaft. The steel insert can also be eliminated. This makes the transmission of torque from the drive pulley to the drive shaft particularly inexpensive.

By providing such a spring element arranged on the hub, a pretensioning of the bearing element for supporting the drive shaft in the bearing housing of the household appliance can be achieved. In particular, a fixed bearing (angestellte Lagerung) of the drive shaft of the laundry drum can be realized. By means of such a roller bearing comprising said spring element, the service life of the bearing as well as the rigidity of the bearing can be increased.

This is based on the following recognition: during operation of the laundry drum (e.g. during a wash cycle and/or during a spin cycle and/or during a drying cycle), the laundry items are randomly distributed in the laundry drum. Thereby resulting in an imbalance, which means that: for household appliances and in particular for drum bearing points (i.e. bearing points of laundry drums) a large mechanical load is imposed.

The structural design of the household appliance described in the application, in which the spring element is arranged on the hub, not only reduces the bearing noise that is generally caused by the rotation of the laundry drum about its axis of rotation, which preferably coincides with the axis of rotation of the drive pulley. More precisely, it is also possible to eliminate special bearing noises which may occur, for example, in the form of rattles or the like, only in the presence of certain edge conditions when the laundry drum is rotating.

In particular, by providing the at least one form-locking element formed in the hub of the transmission pulley and thereby eliminating the need for an insert made of steel, for example, costs can be saved and the effort for providing the transmission pulley can be reduced.

It is furthermore possible to arrange the spring element on the hub in a pre-mounted manner. In this way, the drive pulley can be provided as a pre-installed structural unit, for example by a supplier, together with the spring element arranged on the hub. This reduces the effort required for final installation of the household appliance, since the spring element does not need to be installed again in the context of such final installation.

By providing the at least one hub with a form-locking element which is relatively long in the direction of the rotational axis of the drive pulley, the drive pulley can also be attached particularly simply to the drive shaft for a form-locking and rotationally fixed connection of the drive pulley to the drive shaft. Since a good guidance of the drive pulley along the drive shaft is achieved when the hub is plugged onto the drive shaft by the relatively large length of the form-locking element of the hub. In this way, in particular, it can be avoided to a great extent: the pulley is tipped (i.e. oriented at right angles to the drive shaft, offset from the pulley). This also contributes to a good transfer of torque from the drive pulley to the drive shaft.

Finally, since the spring element is mounted on the hub, it is possible to determine whether the spring element is mounted in a particularly simple manner (for example by visual inspection). Since such a spring element arranged on the hub can be detected well, for example, by the installer or by a person who is responsible for visual inspection, in particular at the time of shipment, and/or by an optical detection device, such as a camera.

Preferably, such a region of the hub is configured as a hollow cylindrical shoulder of the drive pulley: in this region, the spring element is arranged. The spring element is arranged on the outside of the hollow-cylindrical shoulder. What can be achieved thereby is: the hub has a particularly long form-locking element in the direction of the axis of rotation, while at the same time the weight of the drive pulley is relatively small. The hollow cylindrical shoulder preferably has a smaller diameter than the region of the hub which engages the shoulder in the direction of the axis of rotation.

It is further advantageous if the at least one form-locking element of the hub is formed over the entire length of the hub in the direction of the rotational axis. In other words, the form-locking element of the hub extends over the entire axial length of the hub. The available axial length of the hub can thereby be used particularly well for transmitting torque from the drive pulley to the drive shaft.

Preferably, the spring element acts on a bearing element with pressure, by means of which the drive shaft is rotatably mounted in a bearing housing of the household appliance about the rotational axis. In the case of a domestic appliance configured as a washing machine or laundry dryer, the bearing housing can be formed, for example, from an lye container of the domestic appliance. The bearing element can be preloaded by pressure loading of the bearing element. As a result of this pretension, axial forces can be better accommodated by the bearing elements which serve to support the drive shaft in the bearing housing. In particular, an O-oriented, fixed support bearing, i.e. a fixed bearing O-arrangement, can be realized through the pressure lines or force lines running through the bearing elements.

Preferably, at least one radial projection is formed in the region of the hub, which prevents the spring element from falling out of the hub. In this way it is ensured that: the spring element mounted on the hub remains on the hub. This reduces the difficulty of handling the drive pulley, since in this way it is not necessary to pay attention to the fact that the spring element is unintentionally detached from the hub during such handling.

The at least one radial projection can be formed in particular on the end-side edge of the hub region, for example by a upsetting of the hub material (austuchen) or by a deformation or shaping of the hub material in the radial direction.

Preferably, the spring element is configured as a wave spring (Wellenfeder) having at least one peak and at least one trough in the circumferential direction. By means of such a (in particular annular) wave spring, a pretensioning of at least one bearing element for supporting the drive shaft can be achieved functionally reliably even in the case of a relatively small available construction space.

Preferably, the at least one radial projection is arranged in the region of the at least one trough in the circumferential direction of the wave spring. As it is thus possible to simply construct the at least one radial projection with the wave spring fastened to the hub, without this being damaged by the wave spring. This reduces the difficulty of the installation of the spring element on the hub in a loss-proof manner.

It is further advantageous if the spring element has at least one first structural element which cooperates with at least one second structural element formed on the hub. By means of this interaction of the structural elements, the azimuthal orientation of the spring element on the hub can be predefined very simply. On the one hand, this reduces the difficulty of mounting (or placing) the spring element on the hub. On the other hand, it is thereby ensured in a simple manner that: by means of the reshaping (or upsetting) of the hub material in these areas which are not damaged by the spring element, the spring element can be arranged on the hub in a loss-proof manner.

One of these structural elements can be embodied in a very simple and cost-effective manner as a radial projection, while the other of these structural elements is embodied as a depression (for example in the form of a groove).

Preferably, the assembly position of the spring element is predefined by the structural elements, in which assembly position the spring element is arranged on the hub. In this way it is ensured that according to the principle of error protection (Poka Yoke-Prinzip): the spring element can only be placed on the hub in a precisely predetermined manner. This makes the mounting process of the spring element particularly reliable and simple.

Preferably, at least the hub of the pulley is composed of an aluminum alloy. This is on the one hand inexpensive and on the other hand advantageous in terms of the weight of the drive pulley. This applies in particular when not only the hub but also the entire drive pulley is made of aluminum alloy.

Preferably, the mutually corresponding form-locking elements of the hub and of the drive shaft are configured to match the teeth of a toothing (Passverzahnung). This is also advantageous for a good transmission of torque from the drive pulley to the drive shaft, in particular when such mating teeth are configured as serrations (kerb verzahnung).

In the present application, the expressions "upper", "lower", "front", "rear", "horizontal", "vertical", "depth", "width", "height" and the like relate to: the home appliance is given a position and orientation according to the intended use and according to the intended arrangement and in particular to an observer standing in front of the home appliance and looking in the direction of the home appliance.

The features and feature combinations mentioned in the foregoing description and the features and feature combinations mentioned in the following description of the drawings and/or individually shown in the drawings can be used not only in the respectively given combination but also in other combinations or alone without departing from the framework of the application. Thus, embodiments that are not explicitly shown or illustrated in the drawings, but which result from and can be produced by the illustrated embodiments by distinguishing combinations of features, are also to be considered encompassed and disclosed by the present application. Thus, embodiments and combinations of features that do not have all of the features of the independent claims originally written are also contemplated as disclosures. Furthermore, embodiments and combinations of features which deviate from or deviate from the combinations of features given in the reference section of the claims should also be regarded as being disclosed in particular by the embodiments given above.

Drawings

Other advantages, features and details of the application will be apparent from the following description of the preferred embodiments and from the drawings. The drawings show:

fig. 1: a household appliance for caring for items of clothing is shown in a highly schematic and vertical sectional view, in which torque can be transmitted to a drive shaft of a laundry drum via a drive pulley;

fig. 2: the subregions of the drive pulley and the drive shaft are shown in section and in a sectional view;

fig. 3: the drive pulley according to fig. 2 is shown in perspective view in section;

fig. 4: the drive pulley according to fig. 2 is shown in another perspective view in sections; and

fig. 5: the pulley according to fig. 2 is shown in an enlarged detail view in a section in the hub region thereof.

Detailed Description

Fig. 1 shows a household appliance 1 in a schematic view, the household appliance 1 being configured for caring for clothing items. The household appliance 1 can be configured, for example, as a washing machine, dryer or laundry dryer. The household appliance 1 comprises an outer casing 2, in which outer casing 2 a laundry drum 3 is rotatably supported about an axis of rotation a. For example, for this purpose, the drive shaft 4 or drum shaft of the laundry drum 3 can be supported in a bearing housing of an lye container (not shown) of the household appliance 1.

For driving the drive shaft 4 (that is to say for rotating the drive shaft 4 and the laundry drum 3 about the axis of rotation a by means of the drive shaft 4), the household appliance 1 has a belt drive 5, the belt drive 5 comprising a motor 6 and a belt 7. When the motor 6 is running, the drive belt 7 moves the drive pulley 8 in rotation about the axis of rotation a. A hub 9 is formed in one piece with the drive pulley 8, the hub 9 being connected to the drive shaft 4 in a form-locking and rotationally fixed manner.

For this purpose, the mutually corresponding form-locking elements of the hub 9 on the one hand and of the drive shaft 4 on the other hand can be embodied, for example, as teeth 10 of a serration 11, which is schematically shown in fig. 2. The teeth 10 of the hub 9 can be better seen, for example, in fig. 3 and 4, wherein only a few teeth 10 have the reference numerals.

Fig. 2 shows the drive shaft 4, wherein the rear wall 12 of the laundry drum 3 shown in fig. 1 is omitted, and the laundry drum 3 is connected to the drive shaft 4 in a rotationally fixed manner. In contrast, fig. 2 shows a bearing arrangement by means of which the drive shaft 4 is rotatably supported about the axis of rotation a, which bearing arrangement comprises a first bearing element (in the present exemplary embodiment, configured as a rolling bearing 13) and a second bearing element (in the present exemplary embodiment, also configured as a rolling bearing 14). The two rolling bearings 13,14 are preferably fixed support bearings for the drive shaft 4, wherein in particular an O-ring arrangement of the two fixed rolling bearings 13,14 is possible.

For pre-abutment against that rolling bearing 13 of the drive pulley 8, a spring element 15 is then provided, which spring element 15 is shown schematically in fig. 2. As can be seen in particular from the views of fig. 3 and 4, the spring element 15 can be configured in the present exemplary embodiment as a wave spring, for example.

The spring element 15 is currently arranged on the hub 9. It can also be seen from fig. 2 that the teeth 10 of the serrations 11 of the hub 9 extend up to such an area of the hub 9: in this region, the spring element 15 is arranged on the hub 9. As can be seen in particular in connection with fig. 2 and 3, this region of the hub 9 is configured as a hollow cylindrical shoulder 16 of the drive pulley 8, the spring element 15 being arranged on the outside of this shoulder 16. On this shoulder 16, in the direction of the axis of rotation a, a likewise hollow cylindrical section 27 of the hub 9 is connected, the outer diameter of this hollow cylindrical section 27 being greater than the diameter of the shoulder 16. A strut 28 of the drive pulley 8, which is currently formed in one piece with the section 27, extends from the hollow-cylindrical section 27 in the radial direction (see in particular fig. 4).

Thereby, the serrations 11 of the hub 9 extend over a relatively large length of the hub 9 in the direction of the rotational axis a. The serration 11 of the hub 9 extends in particular up to a first step 17 formed in the drive shaft 4. In the region between this first step 17 and the other or second step 18 of the drive shaft 4, the outer diameter of the drive shaft 4 is greater than the region in which the serrations 11 of the drive shaft 4 are formed. Furthermore, a first rolling bearing 13 is arranged in the region between the first step 17 and the second step 18. The hollow cylindrical shoulder 16 formed on the drive pulley 8 preferably rests on the first stepped portion 17. Furthermore, the outer side of the shoulder 16 preferably ends flush with the longitudinal section of the drive shaft 4 formed between the first step 17 and the second step 18.

In the present embodiment, when the drive pulley 8 is connected to the drive shaft 4, the spring element 15 then acts on the inner ring 19 of the first rolling bearing 13 with a pressure acting in the direction of the axis of rotation a. Thereby pre-stressing the first rolling bearing 13.

By the elongated configuration of the serrations 11 in the direction of the axis of rotation a, a good transmission of torque from the drive pulley 8 to the drive shaft 4 is ensured without the need to arrange an insert (or insert) made of steel with matching teeth, in particular serrations, in the drive pulley 8. In this way, the structure of the drive pulley 8 is made particularly simple. Both the drive pulley 8 and the hub 9, which is constructed in one piece with the drive pulley 8, are in the present embodiment composed of an aluminum alloy.

In the case of the transmission pulley 8 being mounted on the drive shaft 4, the drive shaft 4 is arranged vertically such that the rotation axis a runs vertically. The pulley 8 is then fitted from above onto the vertically standing drive shaft 4, and the pulley 8 is finally fastened in its own position (for example by means of the bolts 20 shown in fig. 2). For this purpose, the screw 20 is currently screwed into a bore formed in the drive shaft 4. Although the spring element 15 can be placed on that end region of the drive shaft 4 which has the serrations 11 when the drive pulley 8 is mounted on the drive shaft 4. However, for a reliable process of mounting the spring element 15, it is advantageous to pre-mount the spring element 15 on the pulley 8.

For this purpose, the spring element 15 can be arranged on the outer side of a shoulder 16 configured according to the hollow-cylindrical bulge type and is prevented from being lost or coming off from the hub 9. For example, the end edge 21 of the shoulder 16 can be deformed in at least one location. In this way, at least one radial projection 22 is formed in the shoulder 16.

Two such radial projections 22 are exemplarily shown in the present embodiment. However, the spring element 15 can also be prevented from falling out of the hub 9 over the entire circumference of the shoulder 16 (for example by upsetting the material of the shoulder 16). More than the two radial projections 22 shown in the present example can also be provided, these radial projections 22 preferably being spaced apart from one another uniformly in the circumferential direction. Such deformation of the shoulder 16 (or such upsetting of the material), in particular in the region of the edge 21 of the shoulder 16, can be effected, for example, by means of a press or the like.

In the present exemplary embodiment, on the one hand, the spring element 15 and, on the other hand, the shoulder 16 of the transmission pulley 8 are also formed with mutually cooperating form elements (or structural elements). For example, such structural elements configured on the hub 9 can be configured as recesses or grooves 23 (see in particular fig. 3 and 5). It is then preferred that such structural elements arranged on the sides of the spring element 15 are configured as projections 24, which projections 24 fit into the grooves 23.

In the present embodiment, it is exemplarily shown that: two such mutually corresponding structural elements are formed on opposite sides of the shoulder 16 with reference to the axis of rotation a. By means of such structural or shape elements it is ensured that: the spring element 15 or spring disc or wave spring is arranged on the hub 9 in a predetermined azimuthal orientation. In this way, it is ensured, in particular, according to the principle of protection against errors: the spring element 15 can only be arranged on the hub 9 in exactly that predetermined azimuth orientation or assembly position.

The spring element 15, which is currently constructed as a wave spring, has a plurality of peaks 25 and valleys 26, which are only denoted by a few reference numerals in the figures. For example, in a spring element 15 in the form of a wave spring having four peaks 25 and four troughs 26, the troughs 26 of the spring element 15 can be located in the region of the radial projections 22 of the shoulders 16. By this configuration of the projections 22, the spring element 15 can thereby be prevented from falling off the hub 9 in a particularly simple manner. More or less than the number of peaks 25 and troughs 26 currently exemplarily shown may be provided. The projections 24 of the spring element 15 corresponding to the grooves 23 can also be formed in the region of the respective trough 26.

As can be seen particularly well from fig. 4, the teeth 10 of the serrations 11 extend over the entire axial length of the hub 9 in the direction of the axis of rotation a.

In contrast, it is better from fig. 5 how the structural element in the form of the radial projection 24 engages into the structural element in the form of the groove 23 formed in the shoulder 16 of the hub 9.

In general, these examples show: how well the drive pulley 8, which consists of an aluminum alloy, with the additional spring ring (or spring element 15) can support the laundry drum 3.

List of reference numerals

1. Household appliance

2. Outer casing

3. Clothes drum

4. Driving shaft

5. Drive belt drive

6. Motor with a motor housing

7. Transmission belt

8. Driving belt wheel

9. Hub

10. Teeth

11. Serration part

12. Rear wall

13. Rolling bearing

14. Rolling bearing

15. Spring element

16. Shoulder

17. Ladder part

18. Ladder part

19. Inner ring

20. Bolt

21. Edge of the sheet

22. Raised portion

23. Groove(s)

24. Raised portion

25. Wave crest

26. Trough of wave

27. Segment(s)

28. Stay bar

Arotation axis

Claims

1. A household appliance (1) for caring for clothing items, having a laundry drum (3) comprising a drive shaft (4) and a drive pulley (8) which can be rotated about a rotation axis (A) of the drive pulley (8) by means of a drive belt drive (5) of the household appliance (1),

wherein the drive pulley (8) is connected in a rotationally fixed manner to the drive shaft (4) and the hub (9) of the drive pulley (8) has at least one form-locking element (10) which cooperates with at least one corresponding form-locking element (10) of the drive shaft (4),

it is characterized in that the method comprises the steps of,

the at least one form-locking element (10) of the hub (9) extends in the direction of the rotational axis (a) as far as in the following region of the hub (9): in this region, a spring element (15) is arranged on the hub (9), wherein the length of the at least one form-locking element (10) of the hub (9) is such that the drive pulley (8) can be guided along the drive shaft (4) when the hub (9) is mounted on the drive shaft (4).

2. The household appliance according to claim 1,

it is characterized in that the method comprises the steps of,

the region of the hub (9) is configured as a hollow cylindrical shoulder (16) of the drive pulley (8), and the spring element (15) is arranged on the outside of the shoulder.

3. The household appliance according to claim 1 or 2,

it is characterized in that the method comprises the steps of,

the at least one form-locking element (10) of the hub (9) is embodied over the entire length of the hub in the direction of the rotational axis (A).

4. The household appliance according to claim 1 or 2,

it is characterized in that the method comprises the steps of,

the spring element (15) is pressed against a bearing element (13) by means of which the drive shaft (4) can be rotatably mounted in a bearing housing of the household appliance (1) about the axis of rotation (A).

5. The household appliance according to claim 1 or 2,

it is characterized in that the method comprises the steps of,

in the region of the hub (9), at least one radial projection (22) is formed, which prevents the spring element (15) from falling out of the hub (9).

6. The household appliance according to claim 5,

it is characterized in that the method comprises the steps of,

the at least one radial projection (22) is formed on the end edge (21) of the region.

7. The household appliance of any one of claim 1, 2, 6,

it is characterized in that the method comprises the steps of,

the spring element (15) is designed as a wave spring having at least one peak (25) and at least one trough (26) in the circumferential direction.

8. The home appliance according to claim 7,

it is characterized in that the method comprises the steps of,

the at least one radial projection (22) is arranged in the region of the at least one trough (26) in the circumferential direction of the wave spring.

9. The household appliance of any one of claim 1, 2, 6, 8,

it is characterized in that the method comprises the steps of,

the spring element (15) has at least one first structural element (24) which cooperates with at least one second structural element (23) formed on the hub (9).

10. The household appliance according to claim 9,

it is characterized in that the method comprises the steps of,

one of the at least one first structural element and the at least one second structural element is configured as a radial projection and the other structural element is configured as a recess.

11. The household appliance according to claim 9,

it is characterized in that the method comprises the steps of,

the assembly position of the spring element (15) is predefined by the at least one first and the at least one second structural element, in which assembly position the spring element (15) is arranged on the hub (9).

12. The household appliance of any one of claim 1, 2, 6, 8, 10, 11,

it is characterized in that the method comprises the steps of,

at least the hub (9) of the drive pulley (8) is made of an aluminum alloy.

13. The household appliance of any one of claim 1, 2, 6, 8, 10, 11,

it is characterized in that the method comprises the steps of,

the whole driving belt wheel (8) is made of aluminum alloy.

14. The household appliance of any one of claim 1, 2, 6, 8, 10, 11,

it is characterized in that the method comprises the steps of,

the mutually corresponding form-locking elements of the hub (9) and of the drive shaft (4) are designed to match the teeth of the toothing.

15. The household appliance according to claim 14,

it is characterized in that the method comprises the steps of,

the mutually corresponding form-locking elements of the hub (9) and of the drive shaft (4) are designed to match the teeth of the serrations.