KR20080113255A - A tub having structurally strengthened rear wall and washing machine with the same therein - Google Patents

Abstract

A tub having a structurally reinforced rear wall injection-molded with a bearing housing inserted is provided to help rotation of a drum by reinforcing structurally thickness of portion near to the center, among circumferential ribs. A washing machine comprises a bearing housing(7), and a tub(2). A bearing housing has a flange. The tub is injection molded with the bearing housing inserted into the side wall. The tub forms a concave part(120) and a convex part(110) along its inner or outer circumference. The concave part forms circumference ribs(121,122,123,124) or radial rib(125).

Description

A TUB HAVING STRUCTURALLY STRENGTHENED REAR WALL AND WASHING MACHINE WITH THE SAME THEREIN}

The present invention relates to a tub and a washing machine including a molded injection molded bearing housing supporting a rotating shaft for rotating the drum in the tub containing the wash water.

In general, a washing machine performs washing strokes, rinsing strokes, and dehydrating strokes by rotating a rotating tub and a pulsator through a driving force of a motor. It is a device that washes using friction of water and a rotating tub. These washing machines are classified into pulsator type, stirring type, drum type, etc. according to the washing method.

In particular, the drum washing machine has an indirect connection method in which the driving force of the motor is indirectly transmitted to the drum through a belt wound around the motor pulley and the drum pulley, and the rotor of the BLDC motor is directly connected to the drum. It is divided into direct delivery.

As an example of a washing machine, a structure of a direct drum washing machine will be briefly described with reference to FIG. 1.

As shown in FIG. 1, a tub 2 is installed inside the cabinet 1, and a drum 3 is rotatably installed in the center of the tub 2.

And, the rear wall of the tub (2) is provided with a motor consisting of a stator (6) and a rotor (5). The stator 6 is fixed to the rear wall of the tub 2, the rotor 5 is arranged surrounding the stator 6 and connected to the shaft, the shaft penetrates the tub 2 to the drum ( 3) is combined.

On the rear wall of the tub 2, a bearing housing made of metal for supporting the shaft is inserted. The tub 2 is manufactured by injection molding with a bearing housing inserted therein.

2 shows a conventional tub 2. In particular, FIG. 2 shows the outer surface of the rear wall of the tub 2 in which the motor is installed.

As shown in Fig. 2, the outer surface of the rear wall of the tub 2 into which the bearing housing 7 is inserted and injection-molded includes circumferential ribs 11 and 12 and radial ribs 21 formed in the radial direction. do. In addition, since the radial rib 21 is inclined so that its height is lowered away from the center, there is a problem in that the strength and rigidity of the rear wall of the tub is weak at this portion. Moreover, the further away from the center, the greater the distance between the radial ribs, the greater the problem of weak strength and rigidity in the part farther from the center of the rear wall of the tub.

Further, the circumferential rib 11 on the inner side near the center and the circumferential rib 12 on the outer side far from the center have the same thickness. The closer to the center, the greater the influence of the vibration by the shaft, but even though the strength and stiffness should be better than the part far from the center, there is a problem.

In addition, the circumferential ribs 11 and 12 and the radial ribs 21 are formed relatively high, which is to increase the rigidity and strength of the rear wall of the tub. However, as the height of the ribs increases, the degree of flexibility increases, so that the strength and rigidity of the ribs may not be secured, resulting in structural weakness and difficulty in material cost or mold manufacturing.

On the other hand, since the inner surface (not shown) of the rear wall of the tub is formed with only a smooth surface without forming ribs, the reinforcement of strength and rigidity by the ribs depends only on the ribs on the outer surface. This is one of the reasons that the height of the ribs on the outer surface can only be increased.

For tubs containing wash water, the volume affects the capacity of the washing machine. Here, the volume of the tub is influenced by the position of the inner surface of the rear wall of the tub.

The conventional tub rear wall as described above has a disadvantage in that the volume of the tub is small because the inner surface is biased toward the drum in spite of the thickness considering the height of the rib.

In addition, since the thickness of the rear wall of the tub considering the height of the ribs is thick, it adversely affects the arrangement of other components in a limited space within the cabinet.

Technical challenge

An object of the present invention is to solve the above problems.

Then, recesses and convex portions are formed along the circumferential direction on the rear wall of the tub into which the bearing housing is inserted so as to be structurally strong. At this time, the flange of the bearing housing also forms concave and convex portions corresponding to the shape of the rear wall of the tub so that the rear wall of the tub is structurally stronger.

In addition, a bearing housing having a flange on one side is inserted to provide an injection molded tub, so that there is no problem of excessive stress concetration occurring locally.

Further, by forming a circumferential rib or a radial rib on the rear wall of the tub, the strength and rigidity are further reinforced. In particular, by forming the ribs in the recess, the thickness of the rear wall of the tub can be maintained to a certain degree so that there are no problems with the placement of other parts or the volume of the tub.

In addition, the one closest to the center of the circumferential rib thickens the thickness thereof to have the greatest influence of the shaft vibration, and the part close to the center is structurally strong so that there is no problem in supporting the shaft, thereby helping the drum to rotate smoothly.

In particular, as the capacity of the washing machine is gradually increased, the structure of the tub rear wall is also required to be further strengthened, and the present invention has been derived to meet such demands, and provides a tub rear wall structure without problems even in a large capacity washing machine. do.

Technical solution

Washing machine according to the present invention, the bearing housing having a flange; The bearing housing is inserted into one side wall to be injection molded, and an inner surface or an outer surface of the one side wall is formed with a concave portion and a convex portion in a circumferential direction, and the concave portion has a tub having a circumferential rib or a radial rib; It is configured to include.

The one side wall is a rear wall in the front loading type washing machine that loads the laundry from the front of the washing machine as shown in FIG. 1, and is not shown, but is a vertical wall of the left or right side in the top loading type washing machine that loads the laundry from the upper part of the washing machine. Becomes The one side wall is a part into which a bearing housing for supporting a shaft for rotating the drum is inserted, regardless of the type of washing machine. Hereinafter, the front loading type washing machine will be described as an example, and any type of washing machine can be applied to the object of the present invention and is included in the scope of the present invention.

Since the bearing housing is inserted into the rear wall of the tub and injection molded, the bearing housing and the tub are firmly coupled. Moreover, since the bearing housing has a flange, the flange not only increases the strength and rigidity of the rear wall of the tub, but also makes it more firmly coupled to the tub.

And, since the tub rear wall has a concave portion and a convex portion, strength and rigidity are further enhanced. Such concave portions and convex portions may be formed only on the inner surface of the rear wall or only on the outer surface. Preferably it is formed on both the inner surface and the outer surface.

Here, the recess is formed with a circumferential rib formed in the circumferential direction or a radial rib formed in the radial direction to further strengthen the structure.

Preferably both the circumferential rib and the radial rib are formed.

The present invention has been derived through a lot of experiment and computer aided engineering, the problem that cracks occur when there is a circumferential rib on the same circumference as the part where the outer end of the flange of the bearing housing is located Was found. And, the biggest cause of such problems was found to be due to excessive concentration of stress at the end of the circumferential rib.

Thus, the position of the circumferential rib is preferably spaced from the flange outer end of the bearing housing with respect to the radial direction. That is, it is preferable that the circumferential rib is not positioned on the same circumference as the end of the flange.

In the convex portion, it is preferable to form a circumferential rib or a radial rib on the same circumference as the outer end of the flange.

In particular, when the circumferential rib is located on the same circumference as the outer end of the flange, it is more necessary to form the circumferential rib or the radial rib on the convex portion as described above.

The correlation between the circumferential rib position and the outer end of the flange in relation to the structural strength has been revealed through trial and error and engineering analysis by many tests. Such a solution is the most desirable result among various attempts made by the inventor. To pay.

In addition, the flange of the bearing housing is preferably made to have a concave portion and a convex portion corresponding to the concave convex shape of the rear wall of the tub. It is preferable that the flange is formed to be concave and convex in correspondence with the concave and convex shape of the tub rear wall as it is.

The radial rib is preferably inclined so that its height increases at least in part from the center. In particular, the inclined portion is preferably such that the flange is an uninserted portion. Since the part where the flange is inserted is already sufficiently strengthened by the flange, the height of the radial rib is formed high to reinforce the strength of the part where the flange is not inserted. That is, the height of the radial rib in the outer side of the flange end relative to the center to increase.

In the part close to the center of the rear wall of the tub, the flange of the bearing housing is inserted, and because the spacing between the radial ribs is small, it is relatively structurally strong, but the part far from the center is not. Therefore, the strength is reinforced by increasing the height of the radial rib.

When both the circumferential rib and the radial rib are formed, it is preferable to cross them. Tests and analyzes confirmed that there is a problem of concentration when another stress does not cross each other. In addition, for the same reason, it is preferable that the heights of the circumferential rib and the radial rib are formed to be substantially the same.

On the other hand, since the inside of the center of the rear wall of the tub is a portion that is greatly affected by the vibration caused by the shaft, it is necessary to be stronger structurally. For this purpose, it is preferable that the one located closest to the center of the columnar ribs is thicker in thickness.

Preferably, the circumferential rib is also formed on the flange of the bearing housing, and more preferably, the circumferential rib of the bearing housing is inserted into the circumferential rib closest to the center. The circumferential ribs are positioned on the same circumference as the boss for fastening the stator of the motor.

Favorable effect

According to the present invention, the conventional problems as described above are solved.

In addition, a concave portion and a convex portion are formed along the circumferential direction of the tub rear wall into which the bearing housing is inserted, thereby further increasing the structural strength of the tub rear wall. At this time, when the flange of the bearing housing also forms the concave portion and the convex portion corresponding to the shape of the tub rear wall, the tub rear wall is further strengthened structurally.

Further, by forming a circumferential rib or a radial rib on the rear wall of the tub, the strength and rigidity are further reinforced. In particular, by forming the ribs in the recess, the thickness of the rear wall of the tub can be maintained to a certain degree so that there are no problems with the placement of other parts or the volume of the tub.

In addition, the correlation between the position of the circumferential rib and the outer end of the flange of the bearing housing in relation to structural strength and rigidity is revealed to obtain a structurally strengthened tub rear wall.

In addition, the one closest to the center of the circumferential ribs thickens the thickness thereof, so that the influence of the shaft vibration is the greatest and further reinforces the portion close to the center structurally. And, thereby, there is no problem in the support of the shaft to help smooth rotation of the drum.

1 shows a conventional drum washing machine.

2 shows a conventional tub in which a bearing housing is inserted and injection molded.

Figure 3 shows the outer surface of the rear wall as a tub according to the present invention.

FIG. 4 shows the inner surface of the rear wall as the tub of FIG.

FIG. 5 is an enlarged perspective view of part of FIG. 3; FIG.

Figure 6 shows a cross-sectional view of the motor mounted on the tub as shown in FIG.

Fig. 7 shows a central part of the outer surface of the rear wall as another tub according to the present invention.

FIG. 8 shows the inner surface of the tub as shown in FIG. 7.

Best Mode for Carrying Out the Invention

First, as shown in Figs. 3 to 6, a bearing housing 7 made of a metal material, especially aluminum, is inserted into the rear wall of the tub 2 according to the present invention. The tub 2 is manufactured by inserting the bearing housing 7 into the tub 2 mold and then injecting a plastic melt into the injection mold.

As shown in the back wall of the tub 2, the recesses 120 and 220 and the convex portions 110 and 210 are formed on the inner and outer surfaces. In the present embodiment, the convex portion 110 of the outer wall of the tub 2 corresponds to the concave portion 220 on the inner surface, and the concave portion 120 of the outer surface corresponds to the convex portion 210 on the inner surface. That is, the rear wall of the tub 2 is formed in a concave convex corrugated form along the circumferential direction. This convex shape allows to secure sufficient strength and rigidity even if the substantial thickness of the rear wall of the tub 2 is small.

The bearing housing 7 inserted into the rear wall of the tub 2 has a flange 8, which is also formed in a convex convex shape corresponding to the concave convex shape of the rear wall of the tub 2.

In addition, circumferential ribs 121, 122, 123, and 124 and radial ribs 125 are formed to intersect in the recess 120 of the outer wall of the rear wall of the tub 2. Similarly, the recess of the inner wall of the rear wall of the tub 2 is similarly formed. The circumferential ribs 221, 222, 223, and 224 and the radial ribs 225 intersect with the portion 220.

Of the columnar ribs formed on the rear wall of the tub 2, the one closest to the center (121, 221) is thicker than the others.

Here, the circumferential ribs 81 are formed in the recesses of the flanges 8 of the bearing housing 7 to correspond to the circumferential ribs 121 to 124 and 221 to 224 of the tub. The formed cylindrical ribs 81 are inserted into the ones 121 and 221 closest to the center of the cylindrical ribs 121 to 124 and 221 to 224 formed on the tub 2.

In addition, a boss 131 for bolting the stator 6 of the motor is formed on the rear wall of the tub 2. The boss 131 is located on the circumferential rib 81 formed in the flange 8, and a hole of the boss 131 is exposed to the convex portion 110 of the outer surface of the rear wall of the tub 2.

The ones 121 and 221 closest to the center of the column ribs 121 to 124 and 221 to 224 formed on the tub 2 are disposed on the same circumference as the boss 131 and fastened to the boss 131. We strengthen support of (6).

In addition, the circumferential ribs 121 to 124 and 221 to 224 formed in the recess 120 of the rear wall of the tub 2 are spaced apart from the outer end of the flange 8 with respect to the radial direction. 3 to 4, the circumference indicated by the dashed line 'A' is a portion where the outer end of the flange 8 of the bearing housing 7 is located, and the circumferential ribs 121 to 124 and 221 to 224 are the circumference. Not in phase but spaced apart. As such, since the circumferential ribs 121 to 124 and 221 to 224 are not positioned to coincide with the circumference of the outer end of the flange 8, there is no problem that local stress is concentrated and cracks may occur.

On the other hand, the radial rib 125 has an inclined portion at least in part as shown in the portion denoted by B in Fig. 5, the inclined so that the height of the rib increases as the distance from the center. And, as shown in Figure 5, the inclined portion is preferably started from the portion with a dotted line 'A'. As the distance away from the center of the rear wall of the tub 2, in particular, the portion where the flange 8 is not inserted, the strength and rigidity may be weak, thereby increasing the height of the rib to reinforce it.

In addition, the heights of the circumferential ribs 121 to 124 and 221 to 224 and the radial ribs 125 and 225 are formed to be substantially the same, which prevents a problem that stress can be locally concentrated through a uniform shape. To do this.

Fig. 6 shows a cross-sectional view in which the motor is installed on the rear wall of the tub 2. The stator of the motor is fixed to the boss 131 of the rear wall of the tub 2 via bolts, and the rotor 5 is a shaft. It is connected with (4), and the shaft 4 is connected with the drum (3).

When power is applied to the motor, the shaft 4 rotates while the rotor 5 rotates, thereby rotating the drum 3. Since the drum 3 vibrates while rotating, the vibration is transmitted via the shaft 4 via the bearing housing 7 to the rear wall of the tub 2.

In the case where the capacity of the washing machine is small and the rotational speed of the motor is small, the vibration degree of the drum 3 is also small. Thus, the conventional tub 2 rear wall structure as shown in FIG. As the vibration level of the drum 3 increases as the height increases, the rear wall of the tub 2 having a structurally strengthened structure is required.

Tub 2 rear wall according to the present invention is derived through a lot of trial and error through a number of tests and analysis so that there is no structural problem even in the capacity of the washing machine is increased.

Embodiment for Invention

7 and 8 show another embodiment of the present invention. Only portions different from those of the embodiment of FIG. 3 described above will be described herein.

First, FIG. 7 shows the outer surface of the rear wall of the tub 2, and FIG. 8 shows the inside of the tub 2 including the inner surface of the rear wall of the tub 2.

In this embodiment, as shown in the figure, the circumferential ribs 111 and 211 and the radial ribs 112 and 212 are formed to intersect with each other in the convex portions 110 and 210. The ribs are then located on the circumference A where the outer end of the flange 8 of the bearing housing 7 is located. This reinforces the strength of the portion where the outer end of the flange 8 of the bearing housing 7 is located.

When the circumferential ribs 111 and 211 and the radial ribs 112 and 212 are formed in the convex portions 110 and 210 as described above, unlike the above-described embodiment, the recesses 120 and 220 of the rear wall of the tub 2 are different. Even if the circumferential ribs 121 to 124 and 221 to 224 formed on the circumferential ribs are positioned on the circumference A, the required strength can be secured.

The present invention relates to a tub and a washing machine including a molded injection molded bearing housing supporting a rotating shaft for rotating the drum in the tub containing the wash water.

According to the present invention, the conventional problems as described above are solved.

In addition, a concave portion and a convex portion are formed along the circumferential direction of the tub rear wall into which the bearing housing is inserted, thereby further increasing the structural strength of the tub rear wall. At this time, when the flange of the bearing housing also forms the concave portion and the convex portion corresponding to the shape of the tub rear wall, the tub rear wall is further strengthened structurally.

Further, by forming a circumferential rib or a radial rib on the rear wall of the tub, the strength and rigidity are further reinforced. In particular, by forming the ribs in the recess, the thickness of the rear wall of the tub can be maintained to a certain degree so that there are no problems with the placement of other parts or the volume of the tub.

In addition, the correlation between the position of the circumferential rib and the outer end of the flange of the bearing housing in relation to structural strength and rigidity is revealed to obtain a structurally strengthened tub rear wall.

In addition, the one closest to the center of the circumferential ribs thickens the thickness thereof, so that the influence of the shaft vibration is the greatest and further reinforces the portion close to the center structurally. And, thereby, there is no problem in the support of the shaft to help smooth rotation of the drum.

Claims (10)

A bearing housing having a flange; The bearing housing is inserted into one side wall to be injection molded, and an inner surface or an outer surface of the one side wall is formed with a concave portion and a convex portion in a circumferential direction, and the concave portion has a tub having a circumferential rib or a radial rib; Washing machine comprising a. The washing machine according to claim 1, wherein the circumferential rib is spaced apart from the outer end of the flange of the bearing housing in a radial direction. The washing machine according to claim 1, wherein the convex portion is formed with a circumferential rib or a radial rib, wherein the rib is on the same circumference as the outer end of the flange. The washing machine according to claim 2 or 3, wherein the flange of the bearing housing has a recess and a convex portion corresponding to the recess and the convex portion, respectively. The washing machine according to claim 4, wherein at least a portion of the radial rib formed in the recess of the one side wall of the tub is inclined so as to be farther from the center of the one side wall. The washing machine according to claim 4, wherein the circumferential rib and the radial rib formed in the recess of the one side wall of the tub intersect with each other. The washing machine according to claim 6, wherein the circumferential rib and the radial rib have the same height. The washing machine according to claim 4, wherein a plurality of circumferential ribs formed in the recess of one side wall of the tub is provided in a plurality with respect to the radial direction, and the one closest to the center is thicker than the other. 9. The washing machine according to claim 8, wherein the circumferential rib closest to the center is co-circumferential with the boss for fastening the stator. A concave portion and a convex portion formed on an inner surface or an outer surface thereof in a circumferential direction, the one side wall having a circumferential rib or a radial rib formed on the concave portion; A bearing housing having a flange portion and inserted into the one side wall during injection molding; Washing machine tub configured including.

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