KR101053579B1 - Driving part structure of drum 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 plastic tub having a wall for storing the wash water and fastening the drive; 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 installed to support the shaft; Inserted into the rear wall of the tub, the bearing support of the sleeve shape is inserted into the bearing support portion and the stator fastening portion which extends substantially radially outward from the bearing support portion is exposed to the outside of the tub, 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; The drum washing machine is provided with 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.

Drum washing machine, drive part, fastening part

Description

Structure of driving unit of drum-type washing machine

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

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

Figure 6 is a perspective view of the bearing housing of Figure 5

7 is a perspective view of the stator of FIG.

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

9A is a top view of the stator main portion of FIG. 7, and FIG. 9B is a perspective view of the stator main portion of FIG. 7.

10 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.

11 is a perspective view showing another embodiment of a bearing housing according to the present invention;                 

12 is a detailed longitudinal cross-sectional view of a driving unit structure of a drum washing machine according to a second embodiment of the present invention.

Explanation of symbols on the main parts of the drawings

1: cabinet 2: tub

3: drum 4: shaft

5: rotor 6: stator

7: Bearing housing 7a: Bearing support

7b: Stator tightening part 700b: Tightening hole

710b: positioning groove 153: rivet

The present invention relates to a drum washing machine, and more particularly, to a stator of an outer rotor type BLDC motor applied to a direct drum 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.

In addition, 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 according to 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 stator is fastened There are many problems such as breakage occurring on the tub side.

Therefore, in order to prevent breakage, the metal tub supporter is essential in the existing structure, but in this case, the process of fastening the tub supporter on the rear wall side of the tub separately in the assembly line must be accompanied, and thereafter, The disadvantage of lowering will occur.

The present invention is to solve the above-mentioned problems, an object of the present invention, the assembly process is simplified because it does not need to assemble the tub supporter in the assembly line, while maintaining the drum washing machine structure to secure the support for the stator on the rear wall side of the tub In providing.

Still another object of the present invention is to provide a drum washing machine having an outer rotor-type motor having a stator which can reduce the materials and weight required in manufacturing, simplify the manufacturing process, and can be stably mounted on the tub side. There is this.

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 structure of a driving unit of a drum washing machine, which enables a serviceman to maintain a product more easily when repairing or replacing a product.

According to a first 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 installed to support the shaft; Inserted into the rear wall of the tub, the bearing support of the sleeve shape is inserted into the bearing support portion and the stator fastening portion which extends substantially radially outward from the bearing support portion is exposed to the outside of the tub, 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; The drum washing machine is provided with 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 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 installed to support the shaft; A bearing housing supporting the bearing and a stator fastening part extending radially from the bearing support part to the rear wall of the tub, wherein the stator fastening hole formed in the stator fastening part is exposed; A rotor coupled to the shaft rear end and configured to form a motor together with a stator; The drum washing machine is provided with 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 the 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 installed to support the shaft; a bearing support portion inserted into the rear wall portion of the tub, wherein the bearing support portion is inserted into the rear wall portion of the tub and integrally formed with the bearing support portion, and has a radially extending stator coupling portion; A bearing housing exposed to the outside of the tub and having a stator fastening hole formed at an exposed portion of the stator fastening part; A rotor coupled to the shaft rear end and configured to form a motor together with a stator; And, it is configured to include a stator located inside the rotor and fastened to the stator fastening portion of the bearing housing to form a motor together with the rotor,

The stator includes a spiral core, an insulator surrounding the core, a coil wound around the tooth of the core, and a fastening hole formed integrally with the insulator and protruding into the core to fasten the stator to the bearing housing. Provided is a drum washing machine comprising a fastening portion.                     

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 installed to support the shaft; A bearing housing supporting the bearing and a stator fastening part extending radially from the bearing support part to the rear wall of the tub, wherein the stator fastening hole formed in the stator fastening part is exposed; A rotor coupled to the shaft rear end and configured to form a motor together with a stator; And, it is configured to include a stator located inside the rotor and fastened to the stator fastening portion of the bearing housing to form a motor together with the rotor,

The stator includes a spiral core, an insulator surrounding the core, a coil wound around the tooth of the core, and a fastening hole formed integrally with the insulator and protruding into the core to fasten the stator to the bearing housing. Provided is a drum washing machine comprising a fastening portion.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to FIGS. 4 to 12.

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 first embodiment of the present invention to be.                     

FIG. 6 is a perspective view of the bearing housing of FIG. 5, FIG. 7 is a perspective view of the stator of FIG. 5, FIG. 8 is a perspective view of the spiral core of FIG. 7, and FIG. 9A is a plan view of the main part of the stator of FIG. 9B is a perspective view of the stator main portion of FIG. 7.

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 drum (4) for transmitting the driving force of the motor to the drum (3), and at least one bearing (600a) (600b) 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 bearing housing 7 capable of serving as a support for the bearings installed at both ends of the shaft 4 and stator engagement is provided. It 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 FIGS. 5 and 6, the bearing housing 7 includes a bearing support 7a having a sleeve shape for supporting the bearing, and a bearing support 7a integrally with the bearing support 7a. ) Is formed of an annular stator fastening portion 7b extending radially from the rear end, wherein the bearing support portion 7a is inserted into the rear wall of the tub 2, and the stator fastening portion 7b is It forms the structure exposed from the rear wall part of the tub (2).

The stator fastening portion 7b of the bearing housing 7 is provided with a stator fastening hole 700b, and around the stator fastening hole 700b, corresponding to the positioning projection formed in the stator 6. Positioning groove 710b is formed.

In addition, on the outer circumferential surface of the sleeve-shaped bearing support 7a, the coupling force between the resin and the bearing support 7a is increased during injection molding of the tub 2, and the separation of the bearing housing 7 is prevented. It is preferable to form the recessed surface 700a.

That is, as can be seen through Figures 5 and 6, on the outer circumferential surface of the bearing support portion 7a of the bearing housing 7 has a recessed surface 700a having an outer diameter smaller than that of other portions, and is placed on the recessed surface 700a. The bearing housing 7 cannot be pulled out in the tub rearward direction by the bonding force with the filled resin.

In addition, although the cross-sectional processing is shown in FIG. have.

In addition, the bearing housing 7 of the metal material is provided with a step for supporting the bearings 600a and 600b respectively installed in front and rear of the inner circumferential surface thereof so that the bearings are supported without being separated from the bearing housing 7. .

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 the sealing member 12 is installed on the outer surface of the bushing 11 to prevent moisture from penetrating into the bearing side. do.

On the other hand, a rotor 5 constituting a direct type motor is fastened to the center of the rear end of the shaft 4, and inside the rotor 5 is fastened to a fastening member 15b such as a bolt on the rear wall of the tub 2. The stator 6 is fastened by the rotor 5 to form a direct motor together with the rotor 5.

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 to be formed therein is formed along the circumferential direction, and in the center of the rear wall surface 13a, a through hole is formed to pass through the fastening member 15a for coupling the rotor 5 to the shaft 4. 131 is formed.

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

In addition, a plurality of cooling fins 133 radially around the central portion of the rotor 5 to blow air into the stator 6 when the rotor 5 rotates to cool the heat generated in the stator 6. It is formed so as to make an amplifier, and 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 surface by a lancing process to form an opening toward the opening of the rotor 5, and a through hole 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, the rotor 16 has a connector 16 coupled to a serration on an outer circumferential surface of the rear end of the shaft 4 exposed to the rear of the rear bearing 600b at the edge of the through hole 131 formed at the center of the rotor 5. A fastening hole 137 for fastening to (5) is formed.

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, 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), as shown in Figure 8, as the winding (winding) while rotating the iron plate consisting of the teeth 151 and the base portion 150 from the bottom layer to the top layer spirally Although the structure is formed, the teeth 151 protrude radially outward from the base portion of the spiral core (SC) in the radial direction, the base portion 150 of the spiral core (SC) in the stress during the winding of the core Concave groove 152 is formed to reduce this.

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.

9A and 9B, the stator 6 of the present invention is integrally formed with an insulator and includes a fastening part 143 protruding at least three places radially inward from the core inner circumferential surface. (SC) The length of each tooth 151 protruding from the outer surface 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 determined. When referred to as "b", the fastening portion 143 is formed so that it can be defined as a ≥ b.

At this time, the fastening portion 143 is so that the height is 20% or more of the total core stack height, more preferably the height of the fastening portion 143 is 20% to 150% of the total core stack height. .

In addition, at least one cavity 143c is provided on the fastening part 143 to cushion vibrations when driving the motor, and a stator fastening part exposed through the rear wall of the tub 2 is provided on the fastening part 143. A positioning protrusion 143b is formed to fit into the positioning groove 710b of 7b).

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 under the control of a motor driving controller (not shown) attached to the panel unit, 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 addition, the stator 6 constituting the motor together with the rotor 5 has a recessed groove 152 (see FIG. 8) formed in the base portion 150 of the spiral core SC, thereby reducing stress during winding of the core. This allows the winding to be done easily with less force.

In particular, in the stator 6 having a fastening portion 143 protruding three or more radially from the core inner circumferential surface integrally with the insulator as shown in Fig. 9A, 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 9b, the fastening portion 143 is formed so that the height is 20% or more of the total core stacking height, which is when the height of the fastening portion 143 is 20% or less 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 most preferably formed to be the total core stack height, but may be a height higher than that.

However, since the fastening part 143 is too large, the overall width of the washing machine driving part is increased to reduce the washing capacity of the washing machine. Therefore, the height of the fastening part 143 does not exceed 150% of the total core stacking height. It will be appropriate to avoid.

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 protrusion 143b formed on the fastening part 143 is joined to the positioning groove 710b formed at a position separate from the stator fastening hole 700b formed on the stator fastening part 7b. 6) will help make the fastening easier.

In particular, the bearing housing 7 according to the present invention, the annular stator fastening portion (7) and the stator 6 to which the bearing support portion 7a, which is a sleeve type, which supports the bearings 600a and 600b installed therein, is fastened ( Since 7b) is integrally formed, the existing tub supporter, which serves to support the stator 6 while protecting the rear wall of the tub 2, can be omitted.

In addition, the bearing support 7a of the bearing housing 7 has a recessed surface 700a formed on an outer circumferential surface thereof, thereby increasing the bonding force with the resin during injection molding of the tub 2.

On the other hand, in the present invention, since the stator fastening hole 700b is provided in the stator fastening part 7b of the bearing housing 7, the work of forming a fastening hole having a screw thread in the tub 2 can be eliminated.

That is, according to the structure of the present invention, the stator 6 is bolted and fixed to the stator fastening hole 700b formed in the stator fastening portion 7b exposed through the rear wall 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.

If the positioning groove is formed in the insulator of the stator 6, the 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 is formed along the circumferential direction on the sidewall surface 13b extending forward from the edge, and the magnet M is attached to the inner surface of the rotor 5 when the magnet M is attached to the inner surface of the rotor 5. Since the support is made, the rotor can be easily manufactured.

In addition, a hub portion having a through hole 131 is formed at the center of the rear wall surface 13a of the rotor 5, and a fastening member 15a such as a bolt for coupling the rotor 5 to the shaft 4 is provided. A plurality of cooling fins 133 are radially formed and have a predetermined length in a radial direction around the hub portion of the rotor 5 so that the cooling fins 133 are rotated when the rotor 5 is rotated. ) 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 (not shown) 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.

In addition, the connector 16 is injection-molded as a resin material, and the vibration mode 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 10 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.

Referring to FIG. 10, 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 side of the stator fastening portion 7b of the bearing housing 7 around the fastening hole 143a of the fastening portion 143, the positioning groove 143g for fitting during stator assembly is formed. Is formed.

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, unlike the structure of the stator fastening portion 7b which forms the annular shape of the bearing housing 7 shown in the above-described first embodiment, as shown in FIG. 11, the stator fastening portion of the bearing housing 7 ( 7b) may be formed to extend radially outwardly of the bearing support 7a in the form of a sleeve, and may be formed in a plurality of radially divided structures by being spaced apart at regular intervals along the circumferential direction.

And, Figure 11 is a longitudinal sectional view showing the structure of the drive unit of the drum washing machine according to a second embodiment of the present invention, the configuration different from the above-described first embodiment is the same and only a few different.

First, the stator coupling portion 7b of the bearing housing 7 is also inserted into the tub rear wall portion, but the stator coupling hole 700b and the positioning groove 710b of the stator coupling portion are exposed.

In addition, around the stator fastening hole 700b of the tub 2, the stator fastening portion 7b and the stator 6 are not damaged by the bolt fastening force at the time of stator mounting so that the insulator 144 of the stator 6 is not damaged. The protrusion boss 200 which prevents direct contact is formed.

That is, in the first embodiment, only the bearing support portion 7a is inserted into the tub rear wall portion, but in the driving unit structure according to the present embodiment, not only the bearing support portion 7a but also the stator coupling portion 7b is inserted. The stator fastening hole 700b and the positioning groove 710b provided in the stator fastening part 7b are exposed to the outside of the resin to allow the stator 6 to be coupled to each other, and a protruding boss around the stator fastening hole 700b. 200) is formed.

The other driving unit structure is the same as in the above-described first embodiment, and its operation is also the same as in the above-described embodiment, and thus, further description will be omitted to avoid duplication of description.

On the other hand, also in this embodiment, when the positioning groove is formed in the insulator 144 like the stator 6 of FIG. 10, the positioning projection 7b of the bearing housing 7 is provided with the positioning projection. Will be.

The present invention is not limited to the above-described embodiments, and changes of dimensions, shapes, and materials are of course possible without departing from the scope of the technical idea of the present invention.

For example, a rib (not shown) or a through hole (not shown) may be formed on the surface of the stator fastening portion 7b to help increase the bonding force with the resin during insert injection molding of the bearing housing 7. .

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 particular, the present invention is only the weight of the stator is more than 1.5kg, the rotational speed is variable from 0 to 2,000 RPM or more, while at the tub side when directly attaching the BLDC motor for the washing machine to control the rotation of the drum directly on the tub wall It provides a structure that can withstand the weight and vibration of the motor.

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 the rear wall portion of the tub by the stator fastening portion radially unfolded from the bearing support of the bearing housing. The stator is firmly supported by the stator without damage, and the concentricity of the stator is effectively performed.

The present invention allows the serviceman to more easily maintain the product during repair and replacement of the product.

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 a very useful invention that can improve the productivity, and improve the manufacturability of the components constituting the drive unit to increase the productivity.

Claims (29)

Tub of plastic material 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 installed to support the shaft; Inserted into the rear wall of the tub, the bearing support of the sleeve shape is inserted into the bearing support and the stator fastening portion extending radially outward from the bearing support is exposed to the outside of the tub, the stator is exposed A bearing housing in which a fastening hole is formed; A rotor coupled to the shaft rear end and configured to form a motor together with a stator; And, And 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. The method of claim 1, The stator fastening portion of the bearing housing, Extending radially outward from the cylindrical bearing support, Drum washing machine characterized in that to form an annular structure. The method of claim 1, The stator fastening portion of the bearing housing, Extends radially outwardly of the cylindrical bearing support, A drum washing machine, characterized by being divided into a plurality of to form a radial structure. The method of claim 1, And a positioning protrusion corresponding to the positioning groove provided in the tub is formed around the stator coupling hole of the stator coupling portion. Tub of plastic material 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 installed to support the shaft; A bearing housing supporting the bearing and a stator fastening part radially extending from the bearing support part is inserted into the rear wall of the tub, wherein the stator fastening hole formed in the stator fastening part is exposed; A rotor coupled to the shaft rear end and configured to form a motor together with a stator; And, And 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. The method of claim 5, The stator fastening portion of the bearing housing, Extending radially outward from the cylindrical bearing support, Drum washing machine characterized in that to form an annular structure. The method of claim 5, The stator fastening portion of the bearing housing, Extends radially outwardly of the cylindrical bearing support, A drum washing machine, characterized by being divided into a plurality of to form a radial structure. The method according to any one of claims 5 to 7, And a positioning protrusion corresponding to a positioning groove formed in the stator is formed around the stator coupling hole of the stator coupling portion. The method according to any one of claims 5 to 7, Around the stator fastening hole of the tub, A drum washing machine, characterized in that a protrusion boss is formed to prevent direct contact between the stator fastening portion and the stator so that the insulator of the stator is not damaged by the fastening force applied when the stator is fastened. The method according to claim 1 or 5, The stator is, core; An insulator surrounding the core; A coil wound around the tooth of the core; And, And a fastening part formed integrally with the insulator and extending into the core and having a fastening hole for fastening the stator to the bearing housing. The method according to claim 1 or 5, The stator is, A spiral core wound and stacked in a spiral structure; An insulator made of an insulating material surrounding the core; A coil wound around the tooth of the spiral core; And, Drum washing machine characterized in that it is formed integrally with the insulator and comprises a fastening portion protruding three or more into the core. The method of claim 11, Spiral core, From the bottom layer to the top layer spirally wound to form a multi-layer structure, A plurality of teeth protrude radially outward from the base portion of the spiral core, Drum base washing machine, characterized in that the base portion of the spiral core is provided with a recess groove to reduce the stress during the winding of the core. 13. The method of claim 12, The spiral core is a drum washing machine, characterized in that the rivets are coupled by a rivet penetrating through the through-hole formed in the base portion. 13. The method of claim 12, And a winding start portion and a winding end portion of the spiral core are welded and bonded to predetermined portions of the base in contact with each other. 13. The method of claim 12, The washing groove is a drum washing machine, characterized in that the rectangular or trapezoidal. Tub of plastic material 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 installed to support 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 fastening hole is formed; A rotor coupled to the shaft rear end and configured to form a motor together with a stator; And, 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 a spiral core, an insulator surrounding the core, a coil wound around the tooth of the core, a fastening part integrally formed with the insulator and protruding into the core and provided with a fastening hole. Drum washing machine. The method of claim 16, And a fastening portion provided with a fastening hole for fastening the stator to the bearing housing, wherein at least three fastening portions are protruded into the core. The method of claim 16, Drum fastening machine characterized in that the pin is installed in the fastening hole of the fastening portion. The method according to any one of claims 16 to 18, The height of the fastening portion drum washing machine, characterized in that more than 20% of the total stack height. The method according to any one of claims 16 to 18, When the length of the teeth protruding from the stator core outer surface is "a", and the distance from the inner surface of the stator core to the center of the fastening hole formed in the fastening portion is "b", a≥b is Drum washing machine, characterized in that. Tub of plastic material 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 installed to support the shaft; A bearing housing supporting the bearing and a stator fastening part extending radially from the bearing support part to the rear wall of the tub, wherein the stator fastening hole formed in the stator fastening part is exposed; A rotor coupled to the shaft rear end and configured to form a motor together with a stator; And, 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 a spiral core, an insulator surrounding the core, a coil wound around the tooth of the core, a fastening part integrally formed with the insulator and protruding into the core and provided with a fastening hole. Drum washing machine. The method of claim 21, And a fastening portion provided with a fastening hole for fastening the stator to the bearing housing, wherein at least three fastening portions are protruded into the core. The method of claim 21, Drum fastening machine characterized in that the pin is installed in the fastening hole of the fastening portion. The method according to any one of claims 21 to 23, wherein The height of the fastening portion drum washing machine, characterized in that more than 20% of the total stack height. The method according to any one of claims 21 to 23, wherein When the length of the teeth protruding from the stator core outer surface is "a", and the distance from the inner surface of the stator core to the center of the fastening hole formed in the fastening portion is "b", a≥b is Drum washing machine, characterized in that. Tub of plastic material 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 installed to support the shaft; Inserted into the rear wall of the tub, the bearing support of the sleeve shape is inserted into the bearing support, the stator fastening portion extending radially outward from the bearing support is exposed to the outside of the tub, the stator A bearing housing in which a fastening hole is formed; A rotor coupled to the shaft rear end and configured to form a motor together with a stator; And, And a stator having a weight of 1.5 kg or more positioned inside the rotor and fastened to a stator fastening portion of the bearing housing to form a motor together with the rotor. Tub of plastic material 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 installed to support the shaft; A bearing housing supporting the bearing and a stator coupling portion radially extending from the bearing support portion is inserted into the rear wall of the tub, wherein 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; And, And a stator having a weight of 1.5 kg or more positioned inside the rotor and fastened to a stator fastening portion of the bearing housing to form a motor together with the rotor. Tub of plastic material 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 installed to support 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 fastening hole is formed; A rotor coupled to the shaft rear end and configured to form a motor together with a stator; And, Located in the rotor and configured to include a stator with a weight of 1.5kg or more fastened to the stator fastening portion of the bearing housing to form a motor together with the rotor, The stator includes a spiral core, an insulator surrounding the core, a coil wound around the tooth of the core, a fastening part integrally formed with the insulator and protruding into the core and provided with a fastening hole. Drum washing machine. Tub of plastic material 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 installed to support the shaft; A bearing housing supporting the bearing and a stator fastening part extending radially from the bearing support part to the rear wall of the tub, wherein the stator fastening hole formed in the stator fastening part is exposed; A rotor coupled to the shaft rear end and configured to form a motor together with a stator; And, Located in the rotor and configured to include a stator with a weight of more than 1.5kg fastened to the stator fastening portion of the bearing housing to form a motor together with the rotor, The stator includes a spiral core, an insulator surrounding the core, a coil wound around the tooth of the core, a fastening part integrally formed with the insulator and protruding into the core and provided with a fastening hole. Drum washing machine.

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