KR20050081917A - Structure of driving unit of drum-type washing machine - Google Patents

Abstract

The present invention reduces the weight of the material required during manufacturing, and the stator structure having a structure that can be stably mounted on the tub side while simplifying the manufacturing and assembly process, and a tub structure that can stably support it when the motor is driven It is to provide. To this end, the present invention is a drum washing machine including a tub for storing the wash water, a motor coupled to one side of the tub and having a stator and a rotor, and a stator fastening portion coupled to the stator of the motor and integrally formed with the tub. To provide.

Description

Structure of driving unit of drum-type washing machine

The present invention relates to a drum washing machine, and more particularly to a drive unit of a direct type washing machine.

In general, the drum washing method is a method in which the laundry is performed using the friction force of the rotating drum and the laundry by receiving the driving force of the motor while the detergent, the washing water, and the laundry are put in the drum. These don't get tangled with each other, and can be washed and pounded.

The conventional 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, depending on the driving method. It is divided into direct type that transmits driving force.

Here, the driving force of the motor is transmitted directly through the belt wound around the motor pulley and the drum pulley, instead of being directly transmitted to the drum, energy loss occurs in the driving force transmission process, and a lot of noise is generated in the power transmission process.

Therefore, in order to solve such problems of the conventional drum washing machine, the use of a direct drum washing machine using a BLDC motor is increasing.

Referring to Figure 1 briefly look at the structure of the conventional direct-type drum washing machine as follows.

1 is a vertical cross-sectional view illustrating a conventional drum washing machine, in which a tub 2 is installed inside a cabinet 1 and a drum 3 is rotatably installed in the center of the tub 2.

In addition, a motor is installed at the rear side of the tub (2). The stator (6) is fixed to the rear wall of the tub, and the rotor (5) is axially connected to the drum (3) through the tub while surrounding the stator (6). It is installed as possible.

In addition, between the tub rear wall and the stator is substantially the same as the outer shape of the rear wall portion of the tub (2) is fixed to the tub rear wall when the stator is fastened to support the load and the concentricity of the stator The metal tub supporter which keeps) is interposed.

Meanwhile, a door 21 is installed in front of the cabinet 1, and a gasket 22 is installed between the door 21 and the tub 2 (Tub).

In addition, a hanging spring 23 for supporting the tub 2 is installed between the inside of the upper surface of the cabinet 1 and the upper side of the outer peripheral surface of the tub 2, and the inside of the lower surface of the cabinet 1 and the tub. (2) A friction damper 24 is provided between the lower side of the outer circumferential surface to damp the vibration of the tub 2 generated during dehydration.

On the other hand, Figure 2 is a perspective view of the stator appearance of Figure 1, Figure 3 is a perspective view showing a split core (DC) to be applied to the stator of Figure 2, the conventional stator core manufacturing method by pressing a metal iron plate teeth (151) And the base 150 and at the same side of the tooth 151 on the opposite side of the manufacturing unit cores having a protrusion 500 for forming the fastening hole (500a), and then laminated them to make an assembly, again in the circumferential direction The interconnects complete the stator cores, called split cores.

At this time, the protrusion provides a fastening hole 500a necessary for fastening the stator 6 to the rear wall of the tub and serves to withstand the fastening force of the bolt.

However, the manufacturing method of the stator 6 by such a split core DC is not only complicated in process but also causes a lot of material loss.

Therefore, in order to reduce the loss of materials and simplify the manufacturing process, a so-called spiral core that spirally rotates the iron plate composed of the teeth 151 and the base 150 is useful, but the spiral core (SC) is useful. Since the iron plate punched out in the form of a strip should be bent in a spiral shape when manufacturing the, there is a disadvantage in that it is impossible to form a protrusion for coupling the stator to the tub inside the core.

This is because, when the spiral core (SC) is manufactured, if the protrusion 500 is formed inside the core, the core width becomes too large at the portion where the protrusion exists, making it impossible to bend the core.

Therefore, there is a need for a stator structure to which the spiral core SC can be applied by performing the same role as the protrusion of the split core DC instead of performing the same role in the core itself.

For reference, it is important that the rigidity of the protrusion part having the fastening hole for fastening the stator to the tub side is sufficiently secured as follows.

In the washing machine that directly rotates the drum using a BLDC motor, the stator is directly mounted on the fixed side behind the tub. However, in a large drum washing machine motor having a stator weight of more than 1.5 kg and having a dewatering rotation speed of about 600 to 2,000 RPM, the stator is stably due to the stator weight, vibration during high-speed rotation, and shaking and deformation of the rotor 5. The fastening part of (6) is broken.

In particular, in the case of a drum washing machine which fastens the stator 6 to the tub rear wall while using a BLDC motor, since the radial direction of the stator 6 is substantially parallel to the ground, the stator 6 may be caused by vibration generated during the washing machine operation. ), Damage to the fastening portion with the rear wall of the tub is more severe.

Therefore, it is very important that the rigidity of the protrusion part having the fastening hole for fastening the stator 6 to the tub side should be sufficiently secured.

On the other hand, the existing drum washing machine is a trend to increase the capacity, when looking at the side of the tub in the structure in which the radial direction of the stator is mounted toward the ground, such as drum washing machine, when the weight of the stator is more than 1.5kg, the tub is fastened There are many problems such as breakage occurring on the side.

Therefore, in order to prevent damage to the existing structure, a metal tub supporter is essential, but in this case, the disadvantage of lowering productivity due to the process of fastening the tub supporter on the rear wall side of the tub separately in the assembly line must be accompanied. do.

The present invention is to solve the above-mentioned problems, to reduce the material and weight required during manufacturing, simplifying the manufacturing process, drum washing machine having an outer rotor type motor having a stator that can be stably mounted on the tub side The purpose is to provide.

Another object of the present invention, when the weight of the stator is 1.5kg or more, and when directly attaching the washing machine BLDC motor for controlling the rotation of the drum while the rotation speed is variable to a speed of 0 ~ 2,000 RPM or more directly on the tub wall In the tub side to provide a drum washing machine structure that can withstand the weight and vibration of the motor.

Still another object of the present invention is to provide a drum washing machine structure in which a support force for the stator on the rear wall side of the tub is secured while the assembly process is not required because the tub supporter is not assembled in the assembly line.

Still another object of the present invention is to provide a structure of a driving unit of a drum washing machine, which enables a serviceman to easily maintain a product when repairing or replacing a product.

In order to achieve the above object, the present invention and the tub for storing the wash water; A motor coupled to one side of the tub and having a stator and a rotor; The stator of the motor is coupled, and provides a drum washing machine including a stator fastening portion formed integrally with the tub.

Preferably, the stator fastening part is injection molded to the tub, and the tub is preferably made of plastic and the stator fastening part is made of metal.

On the other hand, the present invention and the tub for storing the wash water; A motor coupled to one side of the tub and having a stator and a rotor; A bearing for supporting rotation of a shaft coupled to the rotor is installed and provides a drum washing machine including a bearing housing integrally formed with the tub.

The bearing housing is preferably injection molded into the tub. The bearing housing may further include a stator fastening portion to which the stator is coupled. In addition, the tub is preferably made of plastic, and the bearing housing is preferably made of metal.

Hereinafter, various embodiments of the present invention for achieving the above object will be described.

According to a first aspect of the present invention, there is provided a plastic tub having a wall for storing wash water and fastening a drive unit; A drum rotatably installed inside the tub; A shaft axially connected to the drum inside the tub through the tub to transmit a driving force of the motor to the drum; At least one bearing supporting the shaft; A bearing housing supporting the bearing and a bearing housing in which a stator coupling portion radially extending from the bearing support portion is inserted into the rear wall of the tub, and the stator coupling hole formed in the stator coupling portion is exposed; A rotor coupled to the shaft rear end and configured to form a motor together with a stator; Located in the rotor and configured to include a stator fastened to the stator fastening portion of the bearing housing to form a motor with the rotor,

The stator includes an annular spiral core forming a multi-layer structure while spirally rotating an iron plate composed of a tooth and a base part from a bottom layer to a top layer, an insulator surrounding the core, a coil wound around the tooth of the core, The drum washing machine is formed integrally with the insulator and is provided with a fastening part having a fastening hole protruding into the core to fasten the stator to the bearing housing.

On the other hand, according to a second aspect of the present invention for achieving the above object, a plastic tub having a wall for storing the wash water and fastening the drive unit; A drum rotatably installed inside the tub; A shaft axially connected to the drum inside the tub through the tub to transmit a driving force of the motor to the drum; At least one bearing supporting the shaft; A bearing housing supporting the bearing and a bearing housing in which a stator coupling portion radially extending from the bearing support portion is inserted into the rear wall of the tub, and the stator coupling hole formed in the stator coupling portion is exposed; A rotor coupled to the shaft rear end and configured to form a motor together with a stator; Located in the rotor and configured to include a stator fastened to the stator fastening portion of the bearing housing to form a motor with the rotor,

The stator includes an annular spiral core forming a multi-layer structure while spirally rotating an iron plate composed of a tooth and a base part from a bottom layer to a top layer, an insulator surrounding the core, a coil wound around the tooth of the core, The drum washing machine is formed integrally with the insulator and is provided with a fastening part having a fastening hole for protruding at least three places into the core to fasten the stator to the bearing housing.

On the other hand, according to a third aspect of the present invention for achieving the above object, a plastic tub having a wall for storing the wash water and fastening the drive unit; A drum rotatably installed inside the tub; A shaft axially connected to the drum inside the tub through the tub to transmit a driving force of the motor to the drum; At least one bearing supporting the shaft; The bearing support portion inserted into the rear wall portion of the tub, the sleeve support portion is inserted into the tub rear wall portion and integrally formed with the bearing support portion, the stator coupling portion extending therefrom is exposed to the outside of the tub, and the exposed portion of the stator coupling portion A bearing housing in which a stator fastening hole is formed; A rotor coupled to the shaft rear end and configured to form a motor together with a stator; Located in the rotor and configured to include a stator fastened to the stator fastening portion of the bearing housing to form a motor with the rotor,

The stator includes an annular spiral core forming a multi-layer structure while spirally rotating an iron plate composed of a tooth and a base part from a bottom layer to a top layer, an insulator surrounding the core, a coil wound around the tooth of the core, The drum washing machine is formed integrally with the insulator and is provided with a fastening part having a fastening hole protruding into the core to fasten the stator to the bearing housing.

On the other hand, according to a fourth aspect of the present invention for achieving the above object, a plastic tub having a wall for storing the wash water and fastening the drive unit; A drum rotatably installed inside the tub; A shaft axially connected to the drum inside the tub through the tub to transmit a driving force of the motor to the drum; At least one bearing supporting the shaft; Inserted into the rear wall of the tub, the bearing support is a sleeve-shaped insert is inserted into the rear wall of the tub and formed integrally with the bearing support, the radially extending stator fastening portion is exposed to the outside of the tub, the stator fastening portion exposed A bearing housing in which a stator coupling hole is formed; A rotor coupled to the shaft rear end and configured to form a motor together with a stator; Located in the rotor and configured to include a stator fastened to the stator fastening portion of the bearing housing to form a motor with the rotor,

The stator includes an annular spiral core forming a multi-layer structure while spirally rotating an iron plate composed of a tooth and a base part from a bottom layer to a top layer, an insulator surrounding the core, a coil wound around the tooth of the core, The drum washing machine is formed integrally with the insulator and is provided with a fastening part having a fastening hole for protruding at least three places into the core to fasten the stator to the bearing housing.

On the other hand, according to the fifth aspect of the present invention for achieving the above object, a plastic tub having a wall for storing the wash water and fastening the drive unit; A drum rotatably installed inside the tub; A shaft axially connected to the drum inside the tub through the tub to transmit a driving force of the motor to the drum; At least one bearing supporting the shaft; A bearing housing supporting the bearing and a bearing housing in which a stator coupling portion radially extending from the bearing support portion is inserted into the rear wall of the tub, and the stator coupling hole formed in the stator coupling portion is exposed; A rotor coupled to the shaft rear end and configured to form a motor together with a stator; A drum washing machine is provided that includes a stator positioned inside the rotor and fastened to a stator fastening portion of the bearing housing to form a motor together with the rotor.

On the other hand, according to a sixth aspect of the present invention for achieving the above object, a plastic tub having a wall for storing the wash water and fastening the drive unit; A drum rotatably installed inside the tub; A shaft axially connected to the drum inside the tub through the tub to transmit a driving force of the motor to the drum; At least one bearing supporting the shaft; Inserted into the rear wall portion of the tub, the bearing support of the sleeve shape is inserted into the bearing support and integrally formed and extends radially outward from the stator fastening portion exposed to the outside of the tub, the stator fastening hole is formed in the exposed portion Bearing housings; A rotor coupled to the shaft rear end and configured to form a motor together with a stator; A drum washing machine is provided that includes a stator positioned inside the rotor and fastened to a stator fastening portion of the bearing housing to form a motor together with the rotor.

Hereinafter, an embodiment of the present invention will be described in detail with reference to FIGS. 4 to 13.

Figure 4 is a longitudinal sectional view schematically showing the configuration of a direct drum washing machine according to the present invention, Figure 5 is an enlarged view of a portion A of Figure 4, a longitudinal sectional view showing the drive unit structure of the drum washing machine according to the present invention.

FIG. 6 is a partially cutaway perspective view illustrating a tub rear wall structure, FIG. 7 is a perspective view of the integrated bracket housing of FIG. 5, FIG. 8 is a rear perspective view of FIG. 7, and FIG. 9 is a cross-sectional view taken along line II of FIG. 7. to be.

10 is a perspective view showing the stator of FIG. 5, FIG. 11 is a perspective view showing the spiral core of FIG. 10, FIG. 12A is a top view of the stator main portion of FIG. 10, and FIG. 12B is a perspective view of the stator main portion of FIG. 10.

The present invention is installed inside the cabinet (1) and has a tub (2) having a wall for storing the wash water and fastening the drive unit, the drum (3) installed inside the tub (2), the drum (3) A drum washing machine having a shaft (4) axially connected to the shaft (4) for transmitting the driving force of the motor to the drum (3), and a bearing installed to support the shaft (4); The tub 2 is made of a plastic material, and in the center of the rear wall portion of the tub 2, a metal material capable of serving as a support for the bearings installed on the outer circumferential surfaces of both ends of the shaft 4 and fastening the stator 6, respectively. The bearing housing 7 is provided.

At this time, the bearing housing 7 is made of an aluminum alloy or the like, and when injection molding of the tub (2) made of plastic, it is configured to be integral with the tub rear wall portion.

Meanwhile, referring to FIG. 5, the bearing housing 7 includes a bearing support 7a having a sleeve shape for supporting the bearing, and a rear end of the bearing support 7a while being integral with the bearing support 7a. The stator fastening portion 7b extending radially from is inserted into the rear wall portion of the tub 2, and forms a structure in which only the stator fastening hole 700b formed in the stator fastening portion 7b is exposed.

7 and 8, the stator fastening portion 7b of the bearing housing 7 extends radially outward from the bearing support portion 7a having a sleeve shape, and has a radial direction. Along with the stepped out region 70b-1 at least once.

In addition, the stator engaging portion 7b of the bearing housing 7 includes a planar region 70b-2 provided between the stepped region 70b-1.

In addition, the stepped region 70b-1 and the planar region 70b-2 of the stator fastening portion 7b of the bearing housing 7 may be connected to each other.

That is, the stator fastening portion 7b of the bearing housing 7 is provided between the region 70b-1 taking the stepped structure while radially outward and the stepped area 70b-1 and forming a plane. The area 70b-1, which is composed of an area 70b-2 and extends outward in the radial direction outward from the upper end of the bearing support 7a in the stator fastening part 7b, has a predetermined distance in the radial direction outward. Each of the stator fastening portions 7b has a structure that is bent downward, and the region 70b-1 connected to the lower end side of the bearing housing 7 has a planar structure.

In addition, a resin filling groove 750a is provided around the upper end of the bearing housing 7 to improve a bonding force with the tub 2 during insert injection molding.

6 and 7, positioning grooves 710b corresponding to the positioning projections formed on the stator 6 are formed around the stator fastening hole 700b of the stator fastening part 7b. do.

6, the stator 6 is attached to a portion corresponding to the periphery of the fastening hole 700b provided in the stator fastening portion 7b of the rear wall portion of the tub 2 by the fastening force applied when the stator 6 is fastened. The protruding boss 200 is formed to prevent direct contact between the stator fastening portion 7b and the stator 6 so that the insulator does not break.

In addition, the rib 720b is formed on the stator fastening portion 7b along a circumferential direction at a position spaced a predetermined distance from the center of the bearing support portion 7a so as to increase the bonding force with the resin during the injection molding of the tub 2. Preferably, although the fastening boss 70b having the stator fastening hole 700b is provided on the rib 720b, the fastening hole 700b is not necessarily formed on the rib 720b.

In addition, the reinforcing rib 201 for reinforcing the strength of the rear wall portion of the tub is formed in the circumferential direction and the radial direction in the region other than the bearing housing step region of the rear wall portion of the tub 2.

On the other hand, unlike the structure of the stator fastening portion 7b of the bearing housing 7 shown in the above embodiment, the radius of the bearing support portion 7a in which the stator fastening portion 7b of the bearing housing 7 is sleeve-shaped It extends outward in the direction, but may be formed so as to form a plurality of radial structure by being spaced apart at regular intervals along the circumferential direction.

5 and 6, the metal bearing housing 7 supports the bearings 600a respectively installed on the inner circumferential surface thereof so that the bearings are supported without being separated from the bearing housing 7. 8a) is formed.

The front end of the shaft 4 is coupled to a spider 10 provided on the rear wall of the drum 3, and the front bearing 600a is exposed from the portion exposed behind the spider 10 of the shaft 4. Brass bushing 11 is press-fitted in the area up to the shaft 4 to prevent rust, and a sealing member 12 is installed on the outer surface of the bushing 11 to prevent moisture ingress into the bearing side. do.

Meanwhile, a rotor 5 constituting a direct type motor is fastened to a center of the rear end of the shaft 4, and the rotor 5 is fastened and fixed to a rear wall of the tub 2 inside the rotor 5. In addition, the stator 14 constituting the direct type motor is positioned.

The rotor 5 is made of a steel plate, and as shown in FIG. 5, on the sidewall surface 13b extending forward from the edge of the rear wall surface 13a, the rotor M may support the magnet M mounted in front of the inner surface thereof. A bent portion having a seating surface 130 to be formed is formed along the circumferential direction, and a fastening member 15a such as a bolt for coupling the rotor 5 to the shaft 4 at the center of the rear wall surface 13a. The hub portion 132 is formed so that the through hole 131 is formed therethrough.

Here, the overall shape of the rotor 5 is preferably formed by press working.

And, around the hub portion 132 of the rotor (5) a plurality of cooling fins that acts to cool the heat generated in the stator 6 by blowing air to the stator (6) when the rotor 5 rotates ( 133 is formed to form a radial (amplifier), wherein the individual cooling fins 133 are formed to have a predetermined length in the radial direction.

The cooling fin 133 is bent at an angle of 90 ° with respect to the rear wall by a lancing process to form an opening toward the opening of the rotor 5, and the through hole 134 formed by the lancing process. Will act as a vent.

In addition, an embossing portion 135 for strengthening the strength of the rotor 5 is formed in the region between each cooling fin 133 of the rotor 5 rear wall surface 13a and the adjacent cooling fins, and the embossing On the part 135, a drain hole 136 for discharging moisture is formed.

Meanwhile, a connector 16 coupled to the edge of the through hole 131 formed in the hub portion 132 of the rotor 5 on the outer circumferential surface of the rear end portion of the shaft 4 exposed to the rear of the rear bearing 600b is connected to the connector 16. ) And a fastening hole 137 for fastening the rotor 5 to the rotor 5 and a positioning hole 138 for determining an assembly position of the connector 16 are formed at a predetermined interval.

The connector 16 is made of a resin material having a different vibration mode from the rotor 5, which is a steel plate, and serves as a bushing for the rotor.

In addition, a serration 164 is formed on the inner circumferential surface of the connector 16 to match the serration 400 formed at the rear end of the shaft 4.

On the other hand, on the rear wall portion of the tub 2 is provided with a hub portion in which the bearing support portion 7a of the bearing housing 7 is inserted therein during injection molding of the tub.

Accordingly, in the present invention, it is possible to omit the tub supporter, which was previously necessary, thereby reducing the number of assembly operations in the assembly line, thereby improving productivity.

That is, in the present invention, the outer shape of the tub 2 is substantially the same as the outer shape, and when the stator 6 is fastened, it is fixed to the tub rear wall to support the stator 6 and at the same time the concentricity of the stator 6. It is possible to omit the tub supporter, which is a separate assembly part to be maintained.

On the other hand, as shown in FIG. 10, the stator 6 constituting the motor together with the rotor 5 includes a spiral core SC, an insulator 144 surrounding the spiral core SC, and the spiral core ( And a coil 142 wound around the teeth 151 of the SC and a fastening part 143 integrally formed with the insulator 144 and protruding at least three places into the core, thereby increasing the capacity of the drum washing machine. Depending on the weight will achieve more than 1.5kg.

In addition, the spiral core (SC) is a multi-layer structure as the winding (winding) while rotating the iron plate consisting of a tooth and the base portion from the bottom layer to the top layer spirally, the base portion of the spiral core (SC) The teeth 151 protrude radially outward from the radial direction, and the base portion 150 of the spiral core SC is formed with a concave groove 152 to reduce the stress when the core is wound.

In addition, the spiral core (SC) is coupled by riveting by a rivet 153 penetrating the through-hole formed in the base portion 150.

 In addition, the winding start portion and the winding end portion of the spiral core SC may be welded to and bonded to a predetermined portion of the base portion 150 in contact with each other.

On the other hand, the recess groove 152 formed in the base portion 150 of the spiral core (SC) may be formed to form a square or trapezoidal, it may be formed to form an arc.

12A and 12B, in the stator 6 having a structure in which at least three fastening portions 143 protrude radially inward from the core inner circumferential surface integrally with the insulator, from the outer surface of the spiral core SC. When the length of each protruding tooth 151 is referred to as "a", and the distance from the inner surface of the spiral core SC to the center of the fastening hole 143a formed in the fastening portion 143 is referred to as "b". The fastening part 143 is formed so that it may be defined as a≥b.

At this time, the fastening portion 143 is formed so that the height is 20% or more of the total core stack height, more preferably the height of the fastening portion 143 is formed to be the total core stack height.

In addition, at least one cavity 143c is provided on the fastening part 143 to cushion vibrations when the motor is driven, and the fastening part 143 is exposed to the rear wall of the tub 2. A positioning protrusion 143b is formed to fit into the positioning groove 710b of the stator fastening portion.

The driving unit operation process of the drum washing machine of the present invention configured as described above is as follows.

When a current flows sequentially through the coil 142 of the stator 6 by the control of a motor driving controller (not shown) attached to the panel part, the rotation of the rotor 5 occurs, which is coupled to the rotor 5. The shaft 16 coupled to the connector 16 and the serration are rotated, so that power is transmitted to the drum 3 through the shaft 4 so that the drum 3 rotates.

On the other hand, the drum washing machine action applied drive structure of the present invention is as follows.

First, since the tub washing machine of the present invention is made of a plastic material having excellent heat resistance, the tub washing machine is light and injection-molded, so that the productivity is improved.

In addition, the drum washing machine of the present invention can be applied to a drum washing machine having a drying stroke because there is no thermal deformation at a high temperature because the bearing housing 7 which is a bearing support means is made of metal such as aluminum alloy.

In the present invention, when the metal bearing housing 7 is injection molded of the tub 2 made of plastic, the bearing housing is insert-injected into the hub of the rear wall of the tub 2 so as to be integral with the tub 2. Due to the configuration, the process of assembling the bearing housing 7 separately from the rear wall of the tub 2 is omitted, thereby simplifying the assembly process and reducing the number of assembly operations.

In the stator 6 constituting the motor together with the rotor 5, as shown in FIG. 11, the recessed groove 152 of the core is formed in the base 150 of the spiral core SC, and the core is wound. By reducing the stress during the winding, the winding operation can be easily done with less force.

In particular, in the stator 6 having a fastening portion 143 protruding three or more radially from the inner circumferential surface of the core integrally with the insulator as shown in FIG. 12A, the protruded from the outer surface of the spiral core SC. When the length of each tooth 151 is called "a" and the distance from the inner surface of the spiral core SC to the center of the fastening hole 143a formed in the fastening part 143 is "b", a It is formed to be ≥ b.

This is advantageous in that the torque acting is smaller as the position of the fastening hole 143a is closer to the point where the load is applied, but if it is too close, the diameter of the bolt inevitably becomes smaller to support the entire stator 6. Too many bolts must be tightened in order to determine this.

In addition, referring to Figure 12b, the fastening portion 143 is formed so that its height is more than 20% of the total core stacking height, which is when the height of the fastening portion 143 is less than 20% of the total core stacking height This is because the fastening part 143 may be damaged by vibration generated when the motor is driven.

In particular, the height of the fastening part 143 is preferably formed to be the entire core stack height, but may be a height higher than that.

However, since the fastening part 143 becomes too large, the overall width of the washing machine driving part is increased, resulting in a reduction in the washing capacity of the washing machine. Therefore, the height of the fastening part 143 is not more than twice the height of the entire core stack. Do not

In addition, the cavity 143c formed on the fastening part 143 performs a buffering and attenuation effect on vibration generated when the motor is driven to improve the mechanical reliability of the stator 6.

In addition, the positioning protrusions 143 b formed on the fastening part 143 are joined to the positioning grooves 710 b of the tub 2 to facilitate the fastening of the stator 6.

In particular, the bearing housing 7 according to the present invention is integrally formed with a bearing support portion 7a in the form of a sleeve for supporting a bearing installed inside and a stator coupling portion 7b to which the stator 6 is fastened. It is possible to omit the existing tub supporter, which serves to support the stator 6 while protecting the rear wall of the tub 2.

At this time, only the stator fastening hole 700b formed in the stator fastening part 7b is exposed to the outside of the resin material without being buried in the tub 2, and around the fastening hole 700b provided in the stator fastening part 7b. The protruding boss 200 is formed on the rear wall of the tub 2 corresponding to the tub 2 to prevent direct contact between the stator fastening portion 7b and the stator 6 when the stator 6 is fastened to the fastening force applied to the fastening member. This protects the insulator portion of the stator 6 from being damaged.

In addition, the stator fastening portion 7b of the bearing housing 7 extends radially outward of the cylindrical bearing support portion 7a, and is formed to have a step at every predetermined distance while going outward along the radial direction and at the same time circumferentially. It is formed to have a structure that is bent repeatedly to have an upper surface and a lower surface along the direction, the bonding force with the tub is improved when the tub (2) injection molding.

In addition, the rib 720b formed along the circumferential direction at a position spaced a predetermined distance from the center of the bearing housing 7 of the stator fastening portion 7b also helps to increase the bonding force with the resin during the injection molding of the tub 2. Done.

In addition, the through holes 730b formed on the stator fastening portion 7b also help to increase the bonding force with the resin in the insert injection molding of the bearing housing 7.

On the other hand, since the present invention is provided with a fastening boss 70b having a stator fastening hole 700b in the bearing housing 7, it is unnecessary to form a fastening hole in the tub 2 separately.

That is, according to the structure of the present invention, the stator 6 is bolted and fixed to the stator fastening hole 700b of the fastening boss 70b formed in the stator fastening portion 7b buried in the rear wall portion of the tub 2.

Since the positioning groove 710b is formed around the stator fastening hole 700b of the stator fastening part 7b in correspondence with the positioning projection formed on the insulator of the stator 6, the tub 2 Workability is improved when the stator 6 is fastened to the rear wall side.

The positioning groove 710b formed in the stator fastening portion 7b of the bearing housing 7 is formed to be exposed without being covered with resin, and the positioning groove is formed in the insulator of the stator 6. In this case, a positioning projection will be formed in the stator fastening portion 7b of the bearing housing 7.

On the other hand, the front end portion of the shaft 4 is coupled to the spider 10 provided on the rear wall of the drum 3, and from the portion exposed to the outside of the spider 10 of the shaft 4 to the front bearing 600a Since the bushing 11 of the brass material is forcedly installed in the region, it is possible to prevent the rusting of the shaft 4.

In addition, since the sealing member 12 is installed on the outer surface of the bushing 11, water penetration into the bearing side is prevented.

Meanwhile, the rotor 5 constituting the direct type motor is coupled to the center of the rear end of the shaft 4, and the stator 6 is positioned inside the rotor 5, and the rear wall surface of the rotor 5 ( 13a) A bent portion having a magnet seating surface 130 is formed along the circumferential direction on the sidewall surface 13b extending forward from the edge, so that the mounting surface 130 when the magnet M is attached to the inner surface of the rotor 5. By the support of the magnet (M) is made, it is easy to manufacture the rotor.

In addition, a hub portion 132 having a through hole 131 is formed at the center of the rear wall surface 13a of the rotor 5, and a fastening member such as a bolt for coupling the rotor 5 to the shaft 4. 15b can pass therethrough, and a plurality of cooling fins 133 are formed radially and have a predetermined length in a radial direction around the hub portion 132 of the rotor 5, so that the rotor 5 In the rotation, the cooling fin 133 blows air toward the stator 6 to cool the heat generated by the stator 6.

At this time, the cooling fin 133 is formed to face the opening side of the rotor 5 by the lancing process, the through-hole 134 formed by the lancing process serves as a vent.

Here, since the rotor 5 is formed of a steel sheet and is formed by press working, the time required for manufacturing the rotor becomes very short, thereby improving productivity in manufacturing the rotor.

In addition, an embossed portion 135 is formed in an area between the cooling fins 133 and the cooling fins of the rear wall surface 13a of the rotor 5 to improve the overall strength of the rotor 5 and to increase the embossed portion ( The drain hole 136 is formed on the 135, and the water is discharged through the drain hole.

The connector 16 is injection molded as a resin material, and the vibration mode of the connector 16 is different from that of the iron plate 5, so that the vibration of the rotor 5 is attenuated and transmitted to the shaft 4.

In addition, a serration 164 is formed on the inner circumferential surface of the hub of the connector 16 so that the rotor 5 of the rotor 5 is connected to the serration 400 formed at the rear end of the shaft 4. Rotational force is transmitted to the shaft 4 as it is.

On the other hand, Figure 13 is a longitudinal cross-sectional view showing another embodiment of the stator constituting the drive unit of the drum washing machine according to the present invention.

Referring to FIG. 13, the stator 6 according to the present embodiment includes a spiral core SC, an insulator 144 surrounding the spiral core SC, and a tooth 151 of the spiral core SC. The coil 142 is wound and a fastening part 143 is formed integrally with the insulator 144 and protrudes into the core.

In other words, the stator 6 according to the present embodiment has a structure in which the fastening portion extends radially inward while forming one as a whole, not a structure in which the fastening portion protrudes three or more radially inwards.

At this time, the spiral core (SC), as in the above-described embodiment, while winding spirally from the bottom layer to the top layer to form a multi-layer structure, the base portion 150 of the spiral core (SC) A plurality of teeth 151 protrude radially outward from the radial direction, the base portion 150 of the spiral core (SC) is formed in the recessed groove 152 to reduce the stress when winding the core It is characterized by.

Then, when the positioning projection is formed on the rear wall portion of the tub around the fastening hole 143a of the fastening portion 143, a positioning groove 143g is formed to be matched when the stator is assembled.

On the other hand, the positioning projection is formed around the fastening hole (143a) of the fastening portion 143, the positioning groove may be formed on the rear wall portion of the tub, of course.

In addition, other components mentioned in the above-described embodiment, which are not mentioned here, are applied in the same manner as in the above-described embodiment, and the operation thereof is the same as in the above-described embodiment, so that further description will be made in order to avoid duplication of description. Will be omitted.

On the other hand, the present invention is not limited to the above-described embodiments, it is a matter of course that changes in dimensions, shapes, materials can be made without departing from the scope of the technical idea of the present invention.

For example, the stator fastening portion 7b of the bearing housing 7 extends radially outward of the cylindrical bearing support portion 7a, but has a stepped area 70b-1 stepped at a predetermined distance along the radial direction. It may be made of a structure.

In addition, while extending radially outward of the cylindrical bearing support 7a, it may take a planar structure with no step difference in the radial direction, and may have a structure having an upper surface and a lower surface repeatedly along the circumferential direction.

The effects of the present invention configured as described above are as follows.

First, the drum washing machine of the present invention is directly connected to the motor structure, noise, failure, power loss is reduced, and since the bearing housing is made of metal, it can be applied to a product having a drying function without thermal deformation.

In the drum washing machine of the present invention, the rotor has a steel plate structure and can be manufactured by press molding, so that the moldability is excellent and the time required for manufacturing is very short, thereby improving productivity.

In addition, in the drum washing machine of the present invention, by adopting a spiral core (SC) having an easy winding structure, waste of the base material is prevented and manufacturing is easy, and the mechanical reliability is improved by reducing the noise and vibration by increasing the rigidity of the stay of the stay. It is possible to improve and extend the lifespan.

In addition, the drum washing machine of the present invention is provided with a connector having a different vibration mode from the rotor to reduce the vibration transmitted from the rotor to the shaft, and by the stator fastening portion 7b extended radially from the housing support of the bearing housing, the tub The stator 6 is firmly supported by the stator without damaging the rear wall of (2), and the concentricity of the stator 6 is effectively maintained.

As described above, the present invention improves the structure of the driving unit of the drum washing machine, thereby reducing the noise and failure by allowing the driving force of the motor to be directly transmitted to the drum to improve the washing power by reducing the power loss and reliability of the product It is possible to improve, and the manufacturability of the parts constituting the drive unit is improved it is possible to improve the productivity during production.

1 is a longitudinal sectional view schematically showing the structure of a conventional direct type washing machine;

2 is a perspective view showing a conventional stator structure

3 is a perspective view illustrating a split core of FIG. 2;

Figure 4 is a longitudinal sectional view schematically showing the structure of a direct drum washing machine according to the present invention

FIG. 5 is an enlarged view of a portion A of FIG. 4, and is a vertical cross-sectional view showing a structure of a driving unit of a drum washing machine according to the present invention.

Figure 6 is a partially cut perspective view showing the tub rear wall structure

7 is a perspective view of the bracket-integrated bearing housing of FIG.

8 is a rear perspective view of FIG.

FIG. 9 is a cross-sectional view taken along line II of FIG. 7. FIG.

10 is a perspective view of the stator of FIG. 5

11 is a perspective view of the spiral core of FIG.

12A is a top view of the stator main portion of FIG. 10, and FIG. 12B is a perspective view of the stator main portion of FIG. 10.

Figure 13 is a longitudinal sectional view showing another embodiment of the stator constituting the drive unit of the drum washing machine according to the present invention.

Explanation of symbols on main parts of drawing

1: cabinet 2: tub

3: drum 4: shaft

5: rotor 6: stator

7: Bearing housing 7a: Bearing support

7b: Stator connection part 70b-1: Step area

70b-2: Non-stepping area 70b: Fastening boss

700b: fastener 710b: positioning groove

720b: Rib 730b: Through hole

750a: Resin filling groove 153: Rivet

Claims (7)

A tub for storing wash water; A motor coupled to one side of the tub and having a stator and a rotor; The stator of the motor is coupled, the drum washing machine including a stator fastening portion formed integrally with the tub. The drum washing machine according to claim 1, wherein the stator fastening part is injection molded to the tub. The drum washing machine according to claim 1 or 2, wherein the tub is made of plastic and the stator fastening part is made of metal. A tub for storing wash water; A motor coupled to one side of the tub and having a stator and a rotor; A bearing for supporting the rotation of the shaft coupled to the rotor is installed, the drum washing machine comprising a bearing housing integrally formed with the tub. The drum washing machine according to claim 4, wherein the bearing housing is injection molded to the tub. The drum washing machine according to claim 5, wherein the bearing housing further comprises a stator fastening portion to which the stator is coupled. The drum washing machine according to claim 4 or 5, wherein the tub is made of plastic and the bearing housing is made of metal.