KR20100079554A - A drum type washing machine - Google Patents

Abstract

PURPOSE: A drum washing machine is provided to improve washing performance by directly supplying fluid to laundry by washing water, steam, and circulating water which is guided from the front to the inside of a drum. CONSTITUTION: A drum washing machine comprises a water supply valve, a drum(30), a tub(20) which comprises an extension part projected to the front in order to form an opening, a water supply part(140) which is formed in the extension part of the tub, an inlet part(130) which is formed in the extension part of the tub, a water supply path which guides washing water from the water supply valve to the water supply part, and an inlet part hose(121) which guides circulating water or steam from a circulating pump or a steam generator to the inlet part.

Description

Drum Washing Machine {A Drum Type Washing Machine}

The present invention relates to a washing machine for washing laundry.

In general, a washing machine includes a pulsator type washing machine and a drum washing machine, and there is also a combined washing machine that can perform drying as well as washing only.

In the drum washing machine, the tub is arranged horizontally, and the drum is also arranged horizontally therein. The laundry is placed inside the drum and tumbled and washed as the drum is pointed.

A water supply valve and a detergent box for storing detergent are connected to external water for supplying the wash water. Between the water supply valve and the detergent box and between the detergent box and the tub are connected to each other by a water supply hose or the like. Thus, the wash water supplied from the water supply valve is supplied into the tub via the detergent box.

The tub is connected to the water hose at the middle portion of the tub to receive the wash water as described above.

In addition, a circulation pump may be included to circulate the wash water contained in the tub. A circulation flow path is formed from the bottom of the tub to the top of the tub for circulation of the wash water as described above. Thus, as the circulation pump operates, the wash water under the tub is drawn out and pumped to the upper tub.

On the other hand, some conventional drum washing machines are equipped with a heater in the tub. The washing power is heated by using the heater and the washing power is improved by using the heated wash water. However, such a conventional washing machine has a drawback in that it takes a lot of energy because it has to heat a large amount of washing water in the tub.

There is a limit in terms of energy in heating the wash water in the tub to raise the laundry or its atmosphere temperature to a desired temperature. It is inefficient from an energy point of view to heat the entire water consumed for washing to raise it to the desired temperature.

Recently, a washing machine having a steam generator has appeared. Such a washing machine supplies steam into a tub or drum. Thus, not only the cleaning power was improved but also the energy efficiency was greatly improved.

One of the important factors with regard to the cleaning power is the laundry or its ambient temperature. Therefore, it is preferable to use a more efficient method among the methods which can raise laundry or the surrounding atmosphere to desired temperature.

In this respect, supplying steam inside the tub or drum is more energy efficient than heating the entire wash water. Rather than heating the entire wash water for washing, a small amount of water is steamed and sprayed directly onto the laundry, saving much energy.

In addition, since the steam is a high temperature there is an advantage that can further increase the temperature of the laundry or the atmosphere around the laundry. Thus, the cleaning power may be further improved.

An object of the present invention is to provide a new washing machine with a water supply structure for supplying wash water and a supply structure for supplying steam or circulating water in relation to the structure of the tub.

By employing a structure for supplying the washing water and steam or circulating water from the tub front portion to perform the washing more effectively.

Washing machine according to the present invention, the water supply valve; A drum in which laundry is located; A tub having the drum rotatably received therein and having an extension protruding forward to form an opening for taking in and out of the laundry; A water supply unit formed at an extension of the tub; An injection unit formed in an extension of the tub; A water supply passage configured to guide wash water from the water supply valve to the water supply unit; And an injection part hose for guiding the circulating water or steam from the circulation pump or the steam generator to the injection part.

The water supply unit is for supplying the wash water supplied from the water supply valve, the injection unit is for supplying steam or circulating water. The water supply valve may be connected to an external water supply source.

The water supply passage may be made to pass through a detergent box containing a detergent. Thus, water introduced from the water supply valve may be introduced into the tub through the water supply unit via a detergent box. A water supply hose may be connected between the water supply valve, the detergent box, and the water supply unit.

The water supply unit and the injection unit may be disposed left / right with respect to the center of the upper drum.

The water supply part may include a water supply port formed in an extension of the tub and into which a water supply hose of the water supply flow path is inserted.

In addition, the water supply may include a water supply guide for guiding the washing water toward the drum.

The injection part may include an injection guide for guiding the circulating water or steam into the drum.

The injection portion and the water supply portion may be located in front of the drum, and the washing water and steam or the circulating water may be guided and supplied into the drum through the water supply guide and the injection guide as described above. In particular, it may be directed to the laundry located under the drum.

In addition, the water supply guide and the injection guide may be shaped so that the supplied fluid is spread as widely as possible.

The water supply guide or the injection guide may include at least one partition plate for partitioning the flow path into two or more.

In addition, the water supply guide may include a laundry guide plate extending below the outlet to guide the laundry so that the laundry is not caught or damaged.

As the drum is rotated, the laundry is rotated, in which case the laundry may interfere with the water supply and be damaged. The laundry guide plate may be shaped to smoothly guide the laundry in the direction of travel while blocking the access of the laundry to such a water supply. In exemplary embodiments, the laundry guide plate may have a triangular shape.

A gasket may be coupled to the extension of the tub. The gasket seals between the tub and the washing machine door to prevent washing water from leaking outside.

The water supply guide may be formed in the gasket.

A water supply port may be formed in the extension part, and the water supply guide may be formed in a portion of the gasket positioned below the extension part.

The water supply guide formed in the gasket may be formed with ribs. The rib supports the sag of the feed guide. Since the gasket is soft, the water guide can be drooped down by the weight of the water and the weight of the water supply guide when water is supplied. The ribs prevent the water guide from sagging. Specifically, the rib may be formed between the portion coupled to the extension of the front gasket and the upper surface of the water supply guide.

The ribs may also have the effect of dispersing the water being fed. That is, the ribs may serve to partition the water to be supplied. That is, it may serve as the partition plate as described above.

In some cases, two or more feed hoses may be connected, and the ribs may be used to separately supply fluid introduced from different feed hoses.

A coupling groove may be formed on an outer surface of the water supply hose so that an edge of the water supply port may be inserted and coupled.

The water supply hose is made of a flexible material and can be stably connected to the tub while the edge of the water inlet is inserted into the coupling groove.

In addition, the water supply hose may further include a branch hose extending to the outside of the tub. The branch hose may be connected to another external fluid supply. For example, the branch hose may be directly connected to the tap water to guide clean water from the tap into the tub.

On the other hand, the injection portion may include a connecting portion connected to the injection portion hose outside the extension of the tub. The connection part may be connected to the injection part hose by inserting into the injection part hose.

In addition, the connection part of the injection part may include a first connection part and a second connection part formed to be spaced apart from each other. The injection hose may include a first hose connected to the first connector and a second hose connected to the second connector.

The first hose may be connected to the circulation pump, and the second hose may be connected to the steam generator. Thus, steam may be supplied into the tub through the second hose through the first hose.

The steam generator may be provided to be controlled and operated directly by the controller of the washing machine. The steam generator may be connected to a water supply valve to receive water. The steam generator may be provided to heat steamed water to generate steam.

The injection part may be coupled to the tub after being made separately from the tub. To this end, an extension portion of the tub may be formed with an injection hole so that the injection portion is inserted and coupled.

In addition, the gasket coupled to the extension portion of the tub may be formed to extend between the inner surface of the extension portion and the injection portion. The injection portion may be coupled to the extension portion with a screw.

The injection part may include an injection guide positioned inside the extension part of the tub, and the injection guide may be screwed to the extension part while the gasket is disposed between the upper surface of the injection guide and the inner surface of the extension part.

In addition, the injection portion may be formed a departure prevention jaw to prevent the injection portion escapes to the inside of the injection hole formed in the extension portion.

On the other hand, the injection portion may be formed integrally with the extension portion. The connection portion of the injection portion may be integrally formed from the outer surface of the extension portion, and the injection guide of the injection portion may be integrally formed from the inner surface of the extension portion.

The tub may be plastic injection molded, and in this case, the injection portion may be integrally injection molded together and provided in the tub.

On the other hand, the washing machine according to the present invention, the rear opening is formed in the rear portion of the tub, the rotating shaft connected to the drum rear; Tub back wall through which the rotating shaft rotatably penetrates; A bearing housing including a bearing for rotationally supporting the rotating shaft; A rear gasket sealing between the rear opening of the tub and the tub back wall, the rear gasket having a corrugation portion to allow the tub back wall to move relative to the rear opening of the tub; A cushioning member for buffering the bearing housing; And the like may further be included.

Here, the tub may be fixedly installed in the washing machine. Unlike the prior art, the vibration of the drum is not buffered and supported by the tub, but is transmitted to the bearing housing through the rotating shaft to be supported by the shock absorbing member.

Since there is the rear gasket between the tub back wall and the rear opening of the tub, the vibration of the drum is not transmitted to the tub.

The present invention provides a washing machine of a new structure in which a water supply part and an injection part are formed in an extension of a tub extending to the full length for taking in and out of laundry.

For example, when the wash water and steam or the circulating water is guided to the drum from the front side, the fluid is directly supplied to the laundry to obtain a good result in a small amount.

1 is a partial exploded perspective view of a washing machine according to an embodiment of the present invention.

The cabinet 10 including the front panel (not shown), the left panel 11, the right panel 12, the rear panel 13, and the bottom panel 14 forms the appearance of the washing machine.

A tub 20 is installed in the cabinet 10, and a drum 30 is rotatably installed in the tub 20.

The tub 20 accommodates the wash water and is introduced into the drum 30 through a plurality of through holes formed in the drum 30.

The tub 20 includes a cylindrical outer tub 21 and a tub cover 23 coupled to the front of the outer tub 21. The rear opening 21a is formed at the rear surface of the outer tub 21.

In addition, the tub cover 23 includes an extension part 23a to a rim which protrudes forward and forms a front opening part for taking in and out of the laundry.

The extension part 23a is provided with a front gasket 150 for sealing between the tub 20 and a door (not shown).

The door is hinged to the front panel of the cabinet 10 to open and close the front opening formed in the extension 23a of the tub cover 23. Withdrawal of the laundry is made by opening and closing the door.

The drum 30 includes a cylindrical drum center 31, a drum front 34 coupled to the front of the drum center 31, and a drum bag 32 coupled to the rear of the drum center 31.

The drum 30 is a place where laundry is placed inside the laundry.

A plurality of lifts (not shown) are installed on the inner wall of the drum 30 to lift and drop the laundry.

The drum bag 32 is coupled to the spider 33 is connected to the rotary shaft 40. Thus, the drum 30 rotates together with the rotation of the rotation shaft 40.

The rotating shaft 40 is rotatably supported by the bearing housing 71 through the tub back wall 50. A bearing is installed inside the bearing housing 71 to support the rotating shaft 40.

In addition, a rear side of the bearing housing 71 is equipped with a motor (not shown), the rotary shaft 40 is directly connected to the motor.

The tub back wall 50 is installed in the rear opening 21a of the outer tub 21.

In addition, a rear gasket 60 is installed between the edge of the rear opening 21a and the tub back wall 50. The rear gasket 60 has a pleat in the middle, and the edge of the rear opening 21a and the outer circumference of the wing tub back wall 50 are maintained at sufficient intervals.

Thus, the movement of the tub back wall 50 is not transmitted to the outer tub 21.

The rear gasket 60 seals between the rear gasket 60 and the tub back wall 50 of the outer tub 21, and serves to enable the tub back wall 50 to be relatively movable with respect to the outer tub 21. .

The bearing housing 71 is connected to the left support bracket 72 and the right support bracket 73 which extend radially in both the left and right sides and then extend forward.

The left support bracket 72 and the right support bracket 73 extend forwardly under the tub 20 and are connected to the left elastic support member 82 and the right elastic support member 83, respectively.

The left elastic support member 82 and the right elastic support member 83 may be a cylindrical suspension having a spring installed therein in the form of a cylinder.

In addition, a rear elastic support member 81 is connected to a lower portion of the bearing housing 71. The rear elastic support member 81 may also be a cylindrical suspension.

The cylindrical suspension may include a cylinder and a piston sliding within the cylinder and a spring connected between the piston and the cylinder to cushion the movement of the piston. The cylinder may be made to slide with frictional resistance inside the cylinder. This will also have a damping function against vibrations.

The rear elastic support member 81, the left elastic support member 82, and the right elastic support member 83 form a triangle and are connected to the bottom panel 14 of the cabinet 10 to prevent vibration of the drum 30. Will be fully supported.

When the left elastic support member 82 and the right elastic support member 83 are symmetrically disposed with respect to the rotation shaft 40, the elastic support members 81, 82, and 83 are all installed vertically. Can be.

The elastic support members 81, 82, and 83 may be connected via a rubber bushing (not shown) when connected to the bearing housing 71 or the bottom panel 14. Thus, it may be allowed to move the upper portion to some extent relative to the bottom panel 14. By the rubber bushing as described above, the movement of the drum in the front-back direction and the left-right direction may be buffered.

The elastic support members 81, 82, and 83 are hingedly connected to the left support bracket 72, the right support bracket 73, and the bearing housing 71. And, the bottom panel 14 of the cabinet may be connected via a rubber bushing or the like. That is, the elastic support members 81, 82, 83 may be fixedly connected to the rubber bushings, respectively, and the rubber bushings may be fixedly connected to the bottom panel 14 again. The rubber bushing allows to some extent the elastic support members 81, 82, 83 being rotated relative to the bottom panel 14 by its elastic deformation. Thus, the upper end of the elastic support members is allowed to be repositioned. The rubber bushing is buffered against the rotation or bending of the elastic support members 81, 82, 83.

In addition, a left damper 91 and a right damper 92 are installed between the support brackets 72 and 73 and the bottom panel 14, respectively.

The left damper 91 and the right damper 92 are inclined with respect to the front-rear direction. The inclined direction is tilted forward in the drawing, but may be installed to tilt backward.

The left damper 91 and the right damper 92 are cylindrical dampers. The piston receives frictional resistance inside the cylinder and performs a damping function by sliding the cylinder inner wall.

Meanwhile, the water supply part 140 and the injection part 130 are formed in the extension part 23a of the tub cover 23.

The water supply unit 140 and the injection unit 130 is located in front of the drum (30). Thus, it is possible to supply water and steam or circulating water toward the inside of the drum 30 from top to bottom and from front to back. This supply direction helps to smoothly supply the fluid supplied to the inside of the drum (30).

2 to 6 will be described an embodiment of the injection unit 130.

An injection hole is formed in the extension part 23a of the tub cover 23, and the injection part 130 is inserted into and coupled to the injection hole. In FIG. 2, two injection holes are formed, and the injection unit 130 shown in FIGS. 3 to 4 is inserted into the injection hole.

The injection part 130 includes a connection part 132 and 133 and an injection guide 135. The connection parts 132 and 133 are exposed out of the extension part 23a, and the injection guide 135 is located inside the extension part 23a.

The connection parts 132 and 133 include a first connection part 133 and a second connection part 132 and are integrally formed with the injection guide 135.

The first connector 133 is connected to the circulation pump 110 through the first hose 111. Thus, water in the tub 20 pumped by the circulation pump 110 is supplied back into the tub 20 through the first hose 111 and the first connection portion 133 (see FIG. 1).

The second connector 132 is connected to the steam generator 100 through a second hose 101. The steam generated by the steam generator 100 is supplied into the tub 20 through the second hose 101 and the second connector 132 (see FIG. 1).

The injection unit 130 is made in the form as shown in FIGS. The first connector 133 and the second connector 132 are formed at the upper portion, and the injection guide 135 is formed at the lower portion so that the steam and the circulating water are directed into the drum 30.

The injection guide 135 is formed with a partition plate 136 to separate the steam and the circulating water. Thus, even if circulating water and steam are supplied at the same time, they can be supplied without mixing with each other.

The partition plate 136 is formed such that the portion of the injection guide 135 in which the circulating water is guided has a larger area than the portion in which the steam is guided. The circulating water is dispersed as widely as possible and can be dropped, and the steam can be supplied to the inside of the drum 30 by maintaining the discharged pressure as much as possible. The drum 30 may be rotated when the circulating water or the steam is supplied, and air may flow in the drum 30 by the rotation.

The air flow inside the drum 30 does not affect the circulating water, but because the steam is light, the air flow may be disturbed to be supplied to the inside of the drum 30. Therefore, the area of the portion where the steam is guided in the injection guide 135 is narrower.

Three injection grooves 134 are formed in the injection part 130 corresponding to the inner surface of the extension part 23a of the tub cover 23. This is for screw fastening. The fastening groove 134 is formed to protrude. The corresponding fastening groove formed in the extension part 23a of the tub cover 23 shown in FIG. 2 passes through the corresponding fastening groove 153 of the front gasket 150 shown in FIG. It is located to correspond to the groove 23b. A screw (not shown) is fastened toward the injection portion 130 from the extension portion 23a of the tub cover 23.

On the outer circumferences of the first connecting portion 133 and the second connecting portion 132, the separation prevention jaw (132a, 133a) are formed so as not to escape from the inside of the injection port formed in the extension portion (23a).

The separation prevention jaw 132a and 133a makes it easier to screw the injection portion 130 into the extension portion 23a of the tub cover 23.

5 illustrates a state in which the injection part 130 as described above is coupled to the extension part 23a of the tub cover 23.

The front gasket 150 is installed at the extension part 23a of the tub cover 23, and the front gasket 150 is extended to be disposed between the injection part 130 and the extension part 23a. have.

The front gasket 150 is disposed between the extension part 23a and the injection part 130 to serve as a bushing. Thus, the injection portion 130 helps to remain firmly coupled to the extension (23a).

The front gasket 150 is extended to surround the injection guide 135 as shown in FIG.

On the other hand, as shown in Figure 5 the lower surface of the injection guide 135 is inclined downward toward the rear. This is to guide steam or circulating water into the drum 30.

7 to 9 illustrate another embodiment of the injection unit 130. FIG. 7 is a view of the tub cover 23 from the outside, FIG. 8 is a sectional view, and FIG. 9 is a view of the tub 20 toward the injection unit 130.

In this embodiment, the injection part 130 is formed integrally with the extension part 23a of the tub cover 23.

That is, the injection part 130 is formed together when the injection molding the tub cover 23 as a part of the tub cover 23.

As shown in FIG. 7, the first connection part 23d and the second connection part 23c of the injection part 130 protrude from the outer surface of the extension part 23a of the tub cover 23. The first connector 23d and the second connector 23c are hollow.

As in the case of the previous embodiment, the first connecting portion 23d is connected to the circulation pump 110 through the first hose 111. In addition, the second connecting portion 23c is connected to the steam generator 100 through the second hose 101.

The injection guide 23e extends inwardly of the tub cover 23 extension 23a as shown in FIGS. 8 and 9. The injection guide 23e also has a partition plate 23f.

The front gasket 160 is coupled to the extension portion 23a and includes a portion 164 extending to surround the bottom surface of the injection guide 23e. A more detailed shape of the front gasket 160 is shown in FIG.

An end portion of the extension part 23a is inserted into the front gasket 160 so that the front gasket 160 and the extension part 23a are coupled to each other. This combination is the same in the previous embodiment of FIGS. 2 to 6.

Meanwhile, the water supply unit 140 will be described with reference to FIGS. 10 to 14. For convenience, the embodiment of the injection unit 130 of FIGS. 7 to 9 is shown together, but the water supply unit 140 may be applied to the embodiment of the injection unit 130 of FIGS. 2 to 6 as it is.

First, FIG. 10 illustrates a state in which the water supply hose 121 is connected to the water supply unit 140. 11 shows the tub cover 23 in a state where the water supply hose 121 is removed.

A water supply port 23g is formed in the extension portion 23a of the tub cover 23. The water supply hose 121 is inserted and installed into the water supply port 23g as shown in FIG.

The water supply hose 121 is connected to the detergent box 120 as shown in FIG. Thus, water is supplied to the water supply unit 140 via the detergent box 120.

Although not shown, the detergent box 120 is connected to the water supply valve connected to the water. Thus, water from the tap water flows into the detergent box 120 through a water supply valve. The water from the detergent box 120 is introduced into the tub 20 via the water supply part 140 through the water supply hose 121.

In addition, a coupling groove 121a is formed at an outer circumference of the water supply hose 121 so that an edge of the water supply port 23g can be inserted. So, the water supply hose 121 is coupled to the water supply port (23g) to help maintain its position stably.

A water supply guide 161 is formed at a position corresponding to the water supply port 23g at the front gasket 160 coupled to the extension part 23a. The water supply guide 161 guides the water discharged from the water supply hose 121 to the drum 30. Specifically, the water supply guide 161 is formed to be concave down.

A branch hose 122 may be formed in the water supply hose 121. The branch hose 122 may be used to supply another fluid to the tub 20. In addition to detergents, it can be used to supply fluids that can be added to laundry. For example, it can be used to supply perfume. Alternatively, it may be used to supply water that is not directly connected to the water supply via the detergent box 120.

FIG. 13 illustrates a view of the water supply unit 140 from the inside of the tub 20.

The water supply guide 161 formed in the front gasket 160 has ribs 163 formed therein. The rib 163 supports the water supply guide 161. When water is watered, the water supply guide 161 may be drooped down by the load of the water and the weight of the water supply guide 161, and the ribs 163 support the water supply guide 161 to prevent it. Specifically, the rib 163 is formed between a portion coupled to the extension portion 23a of the front gasket 160 and an upper surface of the water supply guide 161.

Water supplied due to the ribs 163 formed on the water supply guide 161 may have an effect of being dispersed. That is, the ribs 163 may serve to partition the water to be supplied.

In some cases, two or more water supply hoses 121 may be connected, and the ribs 163 may be used to separate and supply fluid introduced from different water supply hoses 121.

A guide plate 162 is formed below the water supply guide 161 to guide the movement of the laundry. The guide plate 162 is formed in a triangular shape at the bottom of the water supply guide 161 as shown in FIGS.

When the drum 30 is rotated, the laundry in the drum 30 may flow and approach the water supply unit 140. In this case, the laundry guide plate 162 serves to block the access. Then, the laundry continues to flow in a smoothly flowing direction.

The foregoing embodiments are merely examples of the present invention and should not be construed to limit the claims thereof. Naturally, the present invention can be implemented in other forms as long as it falls within the scope.

1 is a partial exploded perspective view of a washing machine according to an embodiment of the present invention.

2 is a view of an embodiment of the injection unit from the outside of the tub.

3 is a perspective view of the injection unit of FIG.

4 is a front view of the injection unit of FIG.

5 is a cross-sectional view in which the injection unit of FIG. 2 is installed.

6 is a perspective view of the front gasket shown in FIG.

7 is a view of another embodiment of the injection unit from the outside of the tub.

8 is a cross-sectional view of the injection unit of FIG.

FIG. 9 is a view of the injection part of FIG. 7 seen from the inside of the tub. FIG.

10 is a partial perspective view of the water supply of FIG.

FIG. 11 is a view illustrating a water supply hose removed from FIG. 10. FIG.

12 is a view of the water supply from the inside of the tub.

13 is a cross-sectional view of the water supply part.

Fig. 14 is a partial perspective view of the front gasket shown in Figs. 8 to 13;

* Description of the main parts of the drawing *

10 cabinet 20 tub

30: drum 40: rotating shaft

50: tub back wall 60: rear gasket

70: bearing housing assembly 80: elastic support member

90: damper 100: steam generator

110: circulation pump 120: detergent box

130: injection portion 140: water supply portion

150, 160: front gasket

Claims (21)

Water supply valve; A drum in which laundry is located; A tub having the drum rotatably received therein and having an extension protruding forward to form an opening for taking in and out of the laundry; A water supply unit formed at an extension of the tub; An injection unit formed in an extension of the tub; A water supply passage configured to guide wash water from the water supply valve to the water supply unit; An injection unit hose guiding circulating water or steam from the circulation pump or the steam generator to the injection unit; Drum washing machine comprising a. The drum washing machine according to claim 1, wherein the water supply unit and the injection unit are respectively disposed left and right above an opening center point of the drum. The drum washing machine according to claim 1, wherein the water supply unit includes a water supply port formed in the tub extension and into which a water supply hose into the water supply passage is inserted. The water supply unit of claim 1, wherein the water supply unit includes a water supply guide for guiding the introduced water into the drum, and the injection unit includes an injection guide for guiding the circulating water or steam into the drum. Drum washing machine. The drum washing machine according to claim 4, wherein at least one rib is formed on an upper surface of the feed water guide to prevent sagging of the feed water guide, and the injection guide comprises at least one partition plate for dividing the flow path into two or more. The drum washing machine according to claim 4, wherein the water supply guide further comprises a laundry guide plate extending below the outlet. The drum washing machine according to claim 1, wherein the water supply passage is via a detergent box containing a detergent. The drum washing machine according to claim 4, further comprising a gasket coupled to an extension of the tub, wherein the feed guide is formed in the gasket. The drum washing machine according to claim 3, wherein a coupling groove is formed on an outer surface of the water supply hose so that an edge of the water supply port is inserted and coupled thereto. The drum washing machine according to claim 1, further comprising a branch hose branched from the water supply passage and extending out of the tub. The drum washing machine according to claim 4, wherein the injection unit includes a connection part inserted into and connected to the injection part hose outside the extension part. 12. The method of claim 11, wherein the connecting portion is spaced apart from each other, the first connection portion and the second connection portion formed independently, the injection hose is a first hose connected to the first connection portion and a second hose connected to the second connection portion Drum washing machine comprising a. The drum washing machine according to claim 11, wherein the extension portion of the tub has an injection hole, and the injection part is inserted into and coupled to the injection hole. 15. The method of claim 13, further comprising a gasket coupled to the extension, wherein the gasket is formed to extend between the injection guide and the inner surface of the extension, the injection guide is screwed to the extension Drum washing machine characterized in that. The drum washing machine according to claim 13, wherein the injection part has a release prevention jaw that prevents the injection part from falling out of the injection hole. The drum washing machine according to claim 11, wherein the connection part and the injection guide are integrally formed with the extension part. The drum washing machine according to claim 16, further comprising a gasket coupled to the extension, wherein the gasket extends to surround the lower surface of the injection guide. The method of claim 12, The drum washing machine further includes a pump for extracting and pumping the washing water in the tub, generating a circulation pump and steam connected to the first hose, and a steam generator connected to the second hose. The tub of claim 1, wherein the tub has a rear opening at a rear portion thereof. A rotating shaft connected to the rear of the drum; Tub back wall through which the rotating shaft rotatably penetrates; A bearing housing including a bearing for rotationally supporting the rotating shaft; A rear gasket sealing between the rear opening of the tub and the tub back wall, the rear gasket having a corrugation portion to allow the tub back wall to move relative to the rear opening of the tub; A cushioning member for buffering the bearing housing; Drum washing machine further comprising. A cabinet comprising a door and forming an appearance; Water supply valve; A detergent box communicating with the water supply valve; A drum in which laundry is located; An extension that protrudes forward to form an opening for taking in and out of the laundry, the extension having a water supply port; Tub formed integrally with; A water supply hose connected to the detergent box and having a coupling groove so that an edge of the water supply port is inserted and coupled to an outer surface thereof; One end is connected to the steam generator or the circulation pump, the other end is connected to the injection portion hose;  A gasket coupled to the extension part to seal between the door and the tub and having a water supply guide bent backward downward in a position corresponding to the water inlet; Drum washing machine comprising a. 21. The method of claim 20, wherein the injection portion hose includes a first hose connected to the circulation pump and a second hose connected to the steam generator, the connection portion is a first connection portion and the second hose connected to the first hose Drum washing machine comprising a second connecting portion connected to the hose.

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