DE112006003872B4 - Tub for a washing machine - Google Patents

Abstract

Tub for a washing machine with a bearing housing (7) with a flange part (8); - Wherein the trough (2) was injection-molded with the bearing housing (7) inserted into one of its walls, - wherein the wall of the trough (2) has a recess part (120, 220) and a projection part (110, 210) attached to its On the inside or outside along a circumferential direction, - wherein a plurality of circumferential ribs (121, 122, 123, 124; 221, 222, 223, 224) are formed on the recess part (120, 220), and - the plurality of circumferential ribs (121, 122, 123, 124, 221, 222, 223, 224) are spaced radially from the outer end of the flange member (8).

Description

Technical area

The invention relates to a tub for a washing machine, in particular a tub with structurally reinforced rear wall for a washing machine. More specifically, it relates to a tub which is injection-molded with a bearing housing used to support a shaft for rotating a drum.

Background Technique

A washing machine is generally a device that washes laundry by automatically performing a wash, rinse and spin cycle. After the laundry and detergent are filled in a drum, a washing operation is performed by using a frictional force between the laundry and washing water. Washing machines are classified, depending on the washing process, into those of a pulsating type, a stirring type and drum washing machines.

In particular, drum washing machines are classified into those with indirectly driving engine and those with direct driving engine. The driving force of the indirectly driving motor is transmitted to the drum through a belt around a motor pulley and a drum pulley. The driving force of a direct-drive motor is transmitted directly to the drum because the rotor of a BLDC motor is directly connected to it.

With reference to the 1 Now, the construction of a direct-drive-type drum type washing machine will be schematically described as an example of a conventional washing machine.

As it is in the 1 is a tub 2 in a corpus 1 arranged, and in the tub 2 is a drum 3 rotatably mounted.

Also is a motor with a stator 6 and a rotor 5 on a back wall of the tub 2 appropriate. The stator 6 is on the back wall of the tub 2 attached, and the stator 6 surrounding rotor 5 is with a wave 4 connected. The wave 4 runs through the tub 2 and is on the drum 3 attached.

In the back wall of the tub 2 is a bearing housing made of metallic material for supporting the shaft 4 used. The tub 2 is manufactured by an injection molding process, wherein the bearing housing is inserted into the mold.

The 2 shows a conventional tub 2 More specifically, the outside of the back wall where the engine is mounted.

As it is in the 2 is shown in the circumferential direction of the outside of the rear wall of the tub 2 a circumferential rib 11 and 12 formed, and it is also on the outside of the rear wall in the radial direction, a radial rib 21 educated. The further away the radial rib is 21 from the center of the back wall, the lower is their height. Accordingly, for the rear wall of the tub 2 there is a problem in terms of stability and strength. Further, the distance between the radial ribs gradually becomes wider from the center. This is the stability of the back wall of the tub 2 not sufficiently high, and at the part of the rear wall away from the center there is a problem in connection with the structural stability.

Also, the thicknesses are the circumferential rib formed closer to the center of the rear wall 11 and that of the more distant from the center formed circumferential rib 12 equal. As the section closer to the center more due to vibrations of the shaft 4 As the more distant section is affected, the closer section must have much higher stability and strength. However, the conventional washing machine fails to solve the above problem.

In addition, in the conventional washing machine, the circumferential ribs 11 and 12 as well as the radial rib 21 relatively high to the stability of the rear wall of the tub 2 to improve. However, the higher the ribs are, the more flexible they are. Therefore, no stability or strength is achieved, as would be required by design, and this leads to a problem associated with structural stability and high manufacturing costs.

Meanwhile, because the inside (not shown) hangs the back wall of the tub 2 is designed as a smooth surface without ribs, the gain of stability alone from the ribs on the outside. This is one of the reasons why the ribs on the outside are high in the conventional washing machine.

The capacity of the tub to receive wash water affects the performance of the washing machine. Here, the capacity of the tub is influenced by the position of the inside of the rear wall. As the conventional back wall of a tub 2 as described above, its inside to the drum 3 has, shows the conventional back wall of the tub 2 the disadvantage that the tub 2 has a small capacity.

Also, it can be assumed that the total thickness of the back wall of the tub 2 with the height of the rib can influence the arrangement of other components in the limited space of the carcass.

From the EP 1 428 924 A1 a tub for a washing machine is known, wherein a plurality of circumferential ribs and a plurality of these radial ribs are provided on the rear wall of the tub, in which a bearing housing is injection molded by injection molding. The radially inner circumferential rib is formed together with a rib provided on the bearing housing in the flange region. The radially outward next circumferential rib is then formed so that it coincides with the edge of the flange portion. Furthermore, two further radially outer circumferential ribs are provided.

Here there is the problem that cracks occur in the rear wall in the region of the radial edge of the flange part of the bearing housing.

From the EP 1 538 252 A1 Another trough for a washing machine is known, in the rear wall of a bearing housing is molded by injection molding. The rear wall is provided with a plurality of radial ribs and circumferential ribs. The bearing housing, which forms a hub, has a flange part, which initially extends radially outward, but is then bent, so that an axial flange is provided, which forms a kind of circumferential rib. The further circumferential ribs are then spaced not only from one another but also from the circumferential rib formed by the axial flange part.

Disclosure of the invention

Accordingly, the embodiment is directed to a constructively reinforced backpan which substantially obviates one or more problems due to limitations or disadvantages in the related art.

The invention has for its object to provide a tub for a washing machine, occur in particular at the location near the outer end of the flange of the bearing housing no problems due to cracks.

This object is achieved by the trough of claim 1. Advantageous embodiments and further developments of the invention are described in the subclaims.

Thus, in the tub of the present invention, no problem is caused due to stress concentration, particularly at the location near the outer end of the flange of the bearing housing.

Further, the ribs are formed on the recess portion to maintain the predetermined total thickness of the rear wall of the tub, so that the arrangement of other components and the capacity of the tub are not affected.

Further, a drum is assisted in smoothly rotating by making the circumferential rib thicker near the center of the rear wall, and the central part, which is most affected by the vibration of the shaft, is structurally reinforced so that the shaft is securely supported becomes.

Recently, there has been a demand for a large-capacity washing machine. Also, the need for a tub with structurally reinforced back wall increased. Thus, this invention was invented to meet the requirements and to provide a back wall of a tub without the problems of the related art in a large capacity washing machine.

The wall of the tub is how it is in the 1 is shown in a front loading type washing machine, the rear wall, while in a Toppladertypmaschine a vertical wall on the left or right side. The wall, regardless of the type of washing machine, is a part into which a bearing housing for supporting a shaft rotating a drum is inserted. Hereinafter, a front loading type washing machine will be exemplified, however, the invention may be applied to any washing machine type within the scope of the invention.

The bearing housing and the tub can be securely connected because the bearing housing is inserted into the rear wall of the tub. In addition, since the bearing housing has the flange part, the stability and the strength of the rear wall of the tub can be increased by the flange part, and the tub and the bearing housing can be securely connected.

Furthermore, the stability and strength of the rear wall can be more improved because the rear wall has the recess part and the projection part. The recess part and the projection part may be formed on the inside or the outside of the back wall. Preferably, the recess part and the projection part are formed both on the inside and on the outside of the rear wall.

Here, a circumferential rib or a radial rib is formed on the recess part in the circumferential direction to reinforce the wall by design. Preferably, both the circumferential rib and the radial rib are formed.

The invention was invented by many experiments and computer-aided techniques. The inventor was motivated to find out something about a cracking problem that occurs when there is a circumferential rib on the same circumference as the circumference of the outer end of the flange portion of the bearing housing. The inventor has found that the strongest reason is the stress concentration at the end of the circumferential rib.

Therefore, it is preferable that the circumferential rib is spaced in the radial direction from the outer end of the flange part. That is, it is preferable that the circumferential rib is not on the same circumference as that of the outer end of the flange part.

In connection with the design stability, many experiments and an empirical process revealed the correlation between the portion of the circumferential rib and the outer end of the flange part, and the above technical solution shows the most preferable result among the various experiments.

In addition, preferably, the flange portion of the bearing housing has a recess portion and a projection portion corresponding to the recess portion and the projection portion of the wall, respectively. It is more preferable that the flange part, concerning the recess part and the projection part, has a stamping appearance corresponding to that of the back wall.

At least part of the radial rib formed on the recess part of the wall is inclined upwards from the center of the wall. In particular, as far as the stability is concerned, it is preferable that the inclined part is a part of the rear wall where the flange part is not inserted because the part where the flange part is inserted is sufficiently reinforced by this. That is, the farther outward it is from the outer end of the flange portion, the higher the radial rib is.

Since the flange part is inserted from the center into the near portion of the rear wall and the distance between the radial ribs is narrow, the central part of the rear wall is naturally reinforced. On the other hand, other parts are not sufficiently reinforced. Thus, the stability is enhanced by increasing the radial rib.

Preferably, the circumferential rib and the radial rib formed on the recess part of the wall of the tub intersect each other. The inventor has found through experiments and computer assisted techniques that the stresses concentrate when they do not intersect. Also, preferably for the same reason, the height of the circumferential rib and that of the radial rib are the same.

Since the inner, central part of the rear wall of the tub is strongly influenced by the vibration of the shaft, it should be structurally reinforced. For this reason, a plurality of circumferential ribs formed on the recessed portion of the wall of the tub are present, and the circumferential rib closest to the center is thicker than the other circumferential ribs.

The circumferential rib closest to the center is formed on the same circumference as that of a bead to which a stator can be fixed.

Preferably, the flange part has a peripheral rib, and more preferably, the circumferential rib of the flange part is inserted into the circumferential rib of the tub that is closest to the center.

It should be noted that both the foregoing general description and the following detailed description of the invention are exemplary and explanatory and are intended to provide further explanation of the claimed invention.

Advantageous effects

Therefore, the invention solves the problems that can occur in the relevant art.

Also, the back wall of the tub, which is injection-molded with the bearing housing inserted therein, structurally reinforced because the recess part and the protrusion part are formed along a circumferential direction of the rear wall of the tub. Here, the flange part of the bearing housing has the recess part and the projection part corresponding to the recess part and the projection part of the back wall, so that the back wall of the tub can be better reinforced in design.

Further, the stability and strength of the rear wall can be increased by the circumferential rib and the radial rib formed on the rear wall of the tub. In particular, the ribs are formed on the recess part. Thus, the thickness of the rear wall can be maintained, and There are no problems associated with attaching the other components and the capacity of the tub. Also, the back wall of the tub can be obtained because the inventor has detected the correlation between the position and the circumferential rib and the outer end of the flange portion of the bearing housing.

The central part of the rear wall, which is affected by the vibration of the shaft, can be structurally reinforced because the one circumferential rib closest to the center of the rear wall is thicker than the other circumferential ribs, thereby securely supporting the shaft around the drum to turn evenly.

Brief description of the drawings

The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate at least one embodiment of the invention and together with the description, serve to explain the principle of the invention explain. The drawings show the following:

1 Fig. 16 is a diagram showing a conventional drum type washing machine according to the related art.

2 Fig. 10 is a diagram showing a conventional tub injection-molded with a bearing housing inserted therein.

3 is a diagram showing the outside of the rear wall of a tub according to the invention.

4 is a diagram showing the inside of the back wall of the tub in the 3 according to the invention shows.

5 is a perspective view, the enlarged key parts in the 3 shows.

6 is a sectional view showing that in the tub of the 3 a motor is mounted.

Best way to carry out the invention

Reference will now be made in detail to the preferred embodiments of the invention, examples of which are illustrated in the accompanying drawings. Wherever possible, the same reference numbers are used throughout the drawings to refer to the same or like parts.

According to the 3 to 6 is a bearing housing 7 made of metallic material used in the rear wall of a tub according to the invention. The tub 2 is by injecting a plastic melt after inserting the bearing housing 7 injected into it.

On the inside or outside of the back wall of the tub 2 are a deepening part 120 and 220 and a projection part 110 and 210 educated. According to this embodiment of the invention, the projection part corresponds 110 on the outside of the tub the recess part 220 on the inside thereof, whereas the recess part 120 on the outside thereof the projection part 210 on the inside of the same corresponds. D. h., That the rear wall of the tub 2 has a embossed appearance formed along a circumferential direction. The above stamping appearance may allow the back wall of the tub 2 provides adequate stability and strength, although not too thick.

That in the back wall of the tub 2 used bearing housing 7 has a flange part 8th , The flange part 8th is also used in an inserted manner with a stamping appearance, which is the embossing appearance of the rear wall of the tub 2 equivalent.

The circumferential ribs 121 . 122 . 123 and 124 and a radial rib 125 cut each other at the recess part 120 the outside of the back wall of the tub. Also, the circumferential ribs cut 221 . 222 . 223 and 224 and the radial rib 225 each other on the recess part 220 the inside of the back wall.

Those circumferential ribs 121 and 221 which is the center of the back wall of the tub 2 are closest to each other, are thicker than the other circumferential ribs.

This is the recess part of the flange 8th of the bearing housing 7 a circumferential rib 81 formed, which the circumferential ribs 121 ~ 124 and 221 ~ 224 the tub 2 equivalent. The circumferential rib 81 of the flange part 8th is in the circumferential rib 121 and 221 used that the center of the tub 2 is closest.

In addition, on the back wall of the tub 2 a bead 131 for fixing a stator 6 a motor formed. The bead 131 is in the circumferential rib 81 of the flange part 8th present, and a hole in the bead 131 lies to the projection part 101 on the outside of the back wall free.

The circumferential rib 121 and 221 that under the circumferential ribs 121 ~ 124 and 221 ~ 224 closest to the center is on the same circumference as that of the ridge 131 present, so that at the bead 131 attached stator 6 is held securely.

The circumferential ribs 121 ~ 124 and 221 ~ 224 of the depression part 120 the back wall are from the outer end of the flange part 8th spaced in the radial direction. One in the 3 and 4 The circumference designated by dashed line A is the part in which the outer end of the flange part 8th of the bearing housing 7 is positioned, and the circumferential ribs 121 ~ 124 and 221 ~ 224 are not on this circumference, but they are spaced from the outer end of the flange. This prevents stresses from concentrating alone in one part, resulting in cracks as the circumferential ribs 121 ~ 124 and 221 ~ 224 not at the same position as the circumference of the outer end of the flange part 8th available.

However, as it is by B in the 5 is shown, at least part of the radial rib 125 inclined. The farther the radial rib is from the center, the higher it is inclined. As it is in the 5 is shown, it is preferable that the inclined part begins at the dashed section A. As the part in which the flange part 8th is not used, in particular, the more distant from the center of the rear wall portion, lower stability and strength, the stability and the strength of the rear wall can be enhanced by the fact that the rib is formed higher.

The height of each of the circumferential ribs 121 ~ 124 and 221 ~ 224 as well as the height of each radial rib 125 and 225 are the same in most sections to prevent stress from concentrating alone in a part of the back wall.

The 6 shows a sectional view of the location where the engine in the rear wall of the tub 2 is appropriate. The stator of the motor is by a screw on the bead 131 the back wall of the tub 2 attached, and a rotor 5 is with a wave 4 connected to the drum 3 connected is.

Once voltage is applied to the motor, the rotor rotates 5 to the shaft 4 to turn. Accordingly, the drum rotates 3 , As the drum vibrates during rotation, this vibration is transmitted through the shaft 4 and the bearing housing 7 transferred to the rear wall of the tub.

When the rotor speed is small due to a small capacity of the washing machine, the vibration of the drum is also 3 small. As a result, the conventional back wall of the tub is sufficient for the vibration. However, as the capacity of washing machines has recently increased, the engine speed is higher. So there was a need for a tub 2 with structurally reinforced rear wall.

The back wall of the tub 2 was invented by an empirical process so as not to cause any problems when the capacity of the washing machine is larger.

Industrial applicability

The invention relates to a trough with structurally reinforced rear wall and a trough with this inside, more specifically, a trough, which was prepared by injection molding with an inserted bearing housing for supporting a shaft for rotating a drum.

Therefore, according to the invention, the problems to which the pertinent art can lead are solved.

Also, the back wall of the tub made by injection molding with the bearing housing used is structurally reinforced because the recess part and the protrusion part are formed along a circumferential direction on the back wall of the tub. Here, the flange portion of the bearing housing has a recess portion and a projection portion corresponding to the recess portion and the projection portion of the rear wall, so that the rear wall of the tub can be better reinforced in design.

Further, the stability and strength of the rear wall can be increased by the circumferential rib and the radial rib formed on the rear wall of the tub. In particular, the ribs are formed on the recess part. Thus, the thickness of the back wall can be maintained, and there are no problems associated with the attachment of other components and the capacity of the tub. Also, the back wall of the tub can be obtained because the inventor has detected the correlation between the position of the circumferential rib and the outer end of the flange portion of the bearing housing.

The central part of the rear wall, which is affected by the vibration of the shaft, can be structurally reinforced because the circumferential ribs closest to the center of the rear wall are thicker than the other circumferential ribs, whereby the shaft is securely supported to rotate the drum uniformly ,

Claims (8)

Tray for a washing machine with a bearing housing ( 7 ) with a flange part ( 8th ); - where the tub ( 2 ) with the bearing housing inserted in one of its walls ( 7 ) was injection-molded, - where the wall of the tub ( 2 ) a deepening part ( 120 . 220 ) and a projection part ( 110 . 210 ) formed on its inside or outside along a circumferential direction, - wherein at the recess part ( 120 . 220 ) a plurality of circumferential ribs ( 121 . 122 . 123 . 124 ; 221 . 222 . 223 . 224 ), and - wherein the plurality of circumferential ribs ( 121 . 122 . 123 . 124 ; 221 . 222 . 223 . 224 ) in the radial direction from the outer end of the flange ( 8th ) are spaced. Tub according to claim 1, wherein at the recess part ( 120 . 220 ) a plurality of radial ribs 125 . 225 are formed. Tub according to claim 1 or 2, wherein the flange part of the bearing housing has a recess part and a projection part, which the recess part ( 120 . 220 ) or the projection part ( 110 . 210 ) corresponds to the wall. Tub according to claim 3, wherein at least a part of the at the recessed part ( 120 . 220 ) of the wall formed radial ribs ( 125 . 225 ) is inclined starting from the center of the wall upwards. Tub according to claim 3, wherein the peripheral ribs ( 121 ~ 124 ; 221 ~ 224 ) and the radial ribs ( 125 ), which at the deepening part ( 120 . 220 ) of the wall of the tub ( 2 ) are formed, intersect each other. Tub according to Claim 5, in which the height of the peripheral ribs ( 121 ~ 124 ) and that of the radial ribs ( 125 . 225 ) are the same. A tub as claimed in any one of the preceding claims, wherein the circumferential rib (17) closest to the center ( 121 ) thicker than the other circumferential ribs ( 122 ~ 124 ). Tub according to claim 7, in which the circumferential rib (17) closest to the center ( 121 ) on the same circumference as that of a bead ( 131 ), to which a stator ( 6 ), is formed.

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