KR20060014967A - Caster roller for vacuum cleaner - Google Patents

Abstract

The present invention relates to a moving wheel of a vacuum cleaner in which an inner wheel and an outer wheel are coupled by molding the outer wheel with the inner wheel inserted into the mold without using a separate coupling member.

The present invention provides an outer ring wheel 410 in contact with the bottom surface when the main body 200 moves in the lower portion of the main body 200 for generating a suction force; An inner wheel wheel 420 provided inside the outer wheel 410 and supporting a load of the main body 200; Movement of the vacuum cleaner including a shaft 430 inserted into and fixed at the center of the inner wheel 420 and the outer wheel 410 to serve as a rotation axis of the inner wheel 420 and the outer wheel 410. In wheels; The shaft 430 has a predetermined depth along the outer circumferential surface is recessed and formed to prevent the separation ring (432) is inserted into the snap ring (S); It has a configuration including a friction portion 434 protrudingly formed with a predetermined length along the other outer peripheral surface of the departure prevention groove (432); The friction part 434 is fixed by the simultaneous restraint of the inner wheel 420 and the outer wheel 410. According to such a configuration, there is an advantage that the sliding between the inner wheel and the outer wheel is prevented, the man-hour and manufacturing cost are reduced.

Vacuum cleaner, moving wheel, inner wheel, outer wheel, shaft

Description

Wheels for vacuum cleaners {Caster roller for vacuum cleaner}

1 is a perspective view showing the appearance of a general vacuum cleaner.

Figure 2 is an enlarged perspective view showing an enlarged appearance of a moving wheel of a general vacuum cleaner.

3 is a cross-sectional view taken along line II ′ of FIG. 2.

Figure 4 is a perspective view showing the appearance of the upright vacuum cleaner employing a preferred embodiment of the present invention.

Figure 5 is an exploded perspective view showing the moving wheel of the vacuum cleaner according to the present invention disassembled from the main body.

Figure 6 is a plan view showing a moving wheel upper surface of the vacuum cleaner according to the present invention.

Figure 7 is a bottom view showing the bottom of the moving wheel of the vacuum cleaner according to the present invention.

8 is a front view showing a shaft provided in the moving wheel of the vacuum cleaner according to the present invention.

Figure 9 is a plan view showing a state before the outer wheel is molded in the moving wheel of the vacuum cleaner of the present invention.

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

Explanation of symbols on the main parts of the drawings                 

100. Suction nozzle body 110. Top nozzle cover

120. Nozzle lower cover 130. Swivel lever

200. Main body 210. Control panel

230. Electric wire stopper 240. Electric wire

250. Suction hose 260. Detachable knob

270. Dust collecting part 280. Dust collecting exhaust seal

290. Discharge part 300. Dust collection unit

310. Dust collector 312. Suction guide

320. Top cover 321. Detachable groove

330. Lower cover 360. Exhaust

400. Wheels 410. Outer wheels

412. Contacts 414. Engagements

416. Central part 418. Anti-rotation protrusion

419. Connections 420. Inner wheels

422. Supporting ribs 424. Anti-rotation groove

426. Resin inlet hole 430. Shaft

432. Breakaway groove 434. Friction

 G. Gate L. lamp

 S. Snap ring

The present invention relates to a vacuum cleaner, and more particularly, to a moving wheel of a vacuum cleaner in which the inner wheel and the outer wheel restrain the shaft at the same time without using a separate coupling member.

First, a description will be given of a conventional vacuum cleaner based on FIG. 1. As shown in the drawing, a general vacuum cleaner includes a main body 20 having a suction means (not shown) for sucking air containing foreign substances from the bottom surface, and a bottom surface by suction force generated inside the main body 20. It consists of a suction nozzle 60 is the air containing the foreign matter of the suction.

The main body 20 may include a lower body 22 to which the suction unit (not shown) is fastened and fastened to prevent the parts embedded in the lower body 22 from being exposed to the outside and to control the vacuum cleaner. It is composed of an upper body 24, which is not shown). Thus, the upper body 24 and the lower body 22 forms the appearance of the body 20.

Between the main body 20 and the suction nozzle 60, the suction hose 30 made of a flexible material, the operation unit 40 connected to the end of the suction hose 30, and the operation unit 40 And an extension tube 50 for extending the suction nozzle 60 are sequentially configured.

In addition, the front of the bottom of the main body 20, the caster 10 is provided so that the main body 20 can smoothly move the bottom surface, the moving wheel (R) is fastened to both rear sides.                         

FIG. 2 is an enlarged perspective view showing an enlarged appearance of a moving wheel of a general vacuum cleaner, and FIG. 3 is a cross-sectional view taken along line II ′ of FIG. 2.

As shown in these figures, the moving wheel 26 forms the outer circumferential surface of the moving wheel R, and the outer wheel wheel 70 which contacts the bottom surface when the main body 20 moves, and the outer wheel. An inner wheel 80 supporting the load of the main body 20 in the inner side of the 70 and a shaft inserted into the center of the inner wheel 80 to serve as a pivot center axis of the moving wheel R ( 90).

The outer wheel 70 is accommodated in the inner wheel (80) therein, it is preferable that the main body 20 is formed of a material containing a predetermined elastic force so as not to slide when moving along the bottom surface. In addition, the anti-rotation protrusion 72 is fixed to one side of the inner circumferential surface of the outer wheel 70 so as to prevent the outer wheel 70 and the inner wheel 80 from flowing with each other. It is provided with a plurality.

On the other hand, the outer circumferential surface side of the inner wheel 80 is provided with a rotation preventing groove 82 recessed and molded to insert the anti-rotation projection (72). That is, the anti-rotation protrusion 72 and the anti-rotation groove 82 are provided at corresponding positions, and the anti-rotation protrusion 72 is inserted at the same time as the inner wheel 80 is inserted into the outer wheel 70. It is inserted into the rotation preventing groove (82). As a result, the outer wheel 70 and the inner wheel 80 are not slid or separated from each other with respect to the rotational direction and the up and down directions.

One end of the shaft 90 is fixed to the center of the inner wheel 70, the other end is inserted into an insertion hole (not shown) formed in one of the rear side of the main body 20, the moving wheel (R) ) Rotates inside the insertion hole (not shown) at the time of rotation. In addition, the shaft 90 is preferably formed of a wear-resistant member so that a predetermined friction is generated inside the insertion hole during rotation, so as not to be worn against such friction.

The lower portion of the shaft 90, the friction portion 92 is protruded. The friction part 92 serves to prevent the shaft 90 from slipping inside the inner wheel 70 when the moving wheel R is rotated, and has a predetermined length on the outer circumferential surface of the shaft 90. Is extruded and molded.

The other side of the friction portion 92 of the shaft 90, the separation prevention groove 94 is further provided. The release preventing groove 92 is recessed and formed along the outer circumferential surface with a predetermined width so that the snap ring can be inserted after the shaft 90 is inserted into the insertion hole (not shown) of the main body 20. That is, when the snap ring is inserted into the release preventing groove 94 after the shaft 90 is inserted into the insertion hole (not shown), the movable wheel R is fixed to the main body 20 so as to be rotatable. .

Hereinafter, the operation of the vacuum cleaner having the above configuration will be described.

First, when electricity is applied through a wire (not shown) connected to a power supply unit (not shown) embedded in the main body 20, the vacuum cleaner is in a standby state. At this time, if the user adjusts the suction step by using the button of the operation unit 40, the suction force suitable for each step is generated by the suction means built in the main body 20.

The suction force generated through the suction means is transmitted to the suction nozzle 60 through the suction hose 30 and the extension pipe 50. The air containing the foreign matter such as dust or lint is sucked by the suction force transmitted to the suction nozzle 60, and the sucked air is separated from the fine dust in the dust collector (not shown), and then the clean air is discharged ( Through the process of discharging to the outside of the main body 20 through the cleaning is performed.

Then, when the user grabs the cleaner operation unit 40 and moves to the cleaning area during the cleaning, the tension force acts through the suction hose 30, and thus the main body 20 moves. This movement is mainly made by the moving wheel (R), the direction is easily made by the caster (10).

However, the moving wheel of the vacuum cleaner according to the prior art as described above has the following problems.

That is, the anti-rotation groove 82 and the anti-rotation protrusion 72 which allow the inner wheel 80 and the outer wheel 70 to be fixed to each other are weakly bound so that the anti-rotation protrusion 72 may be used when the cleaner is used for a long time. There is a problem of wear or breakage.

In addition, when the restraint of the inner wheel 80 and the outer wheel 70 is terminated due to abrasion and damage of the anti-rotation protrusion 72, the moving wheel R is idle, so that the main body 20 is cleaned. There is a problem that is not easy to move.

In addition, the shaft 90 is constrained only by the inner wheel 80, the inner wheel 80 by a large impact transmitted to the moving wheel (R) when the main body 20 crosses an obstacle such as a threshold. It is not desirable because the center of it is easily broken.

An object of the present invention for solving the problems in the prior art as described above, the outer wheel wheels 2 in the state in which the inner wheel wheel is inserted into the mold by inserting the shaft by primary molding without using a separate coupling member By forming the vehicle, the inner wheel and the outer wheel provide a moving wheel of the vacuum cleaner which simultaneously restrains the shaft.

According to a feature of the present invention for achieving the above object, the present invention, An outer ring wheel that contacts the bottom surface when the main body moves under the main body generating suction force; An inner wheel wheel provided inside the outer wheel and supporting the load of the main body; In the moving wheel of the vacuum cleaner is fixed to the center of the inner wheel and the outer wheel, comprising a shaft that serves as a rotation axis of the inner wheel and the outer wheel;

The shaft is recessed and molded to have a predetermined depth along the outer circumferential surface and the separation prevention groove is inserted into the snap ring; It has a configuration including a friction portion protruding molded to have a predetermined length along the other outer peripheral surface of the separation prevention groove; The friction part is characterized by being fixed by the simultaneous restraint of the inner wheel and the outer wheel.

The inner wheel wheel is a plurality of radially formed from the center of the inner wheel wheel, the support rib for supporting the load of the main body; An anti-rotation groove recessed and molded to a predetermined depth between the support ribs and coupled to one side of the outer wheel; It is characterized in that it comprises a resin inlet hole that is formed through the outer surface of the upper wheel of the inner wheel to allow the resin to flow in forming the outer wheel.

The outer wheel includes a contact portion forming an outer circumferential surface and in contact with the bottom surface; A latching portion bent perpendicularly to an end portion of the contact portion to restrain the inner wheel from being separated from the lower portion of the outer wheel; A central portion forming a part of the upper surface of the moving wheel at the center of the moving wheel and contacting the outer circumferential surface of the friction part; A anti-rotation protrusion which is protruded and formed in the lower portion of the center and is inserted into the anti-rotation groove; It characterized in that it comprises a connecting portion for connecting the anti-rotation protrusion and the contact portion to each other at the bottom of the inner wheel.

The anti-rotation protrusion is characterized in that it is formed larger in one side than the size of the anti-rotation groove.

The anti-rotation protrusion is characterized in that at the same time restrains the rotational direction and the central axis direction of the inner wheel and the outer wheel.

The outer wheel is injection molded and characterized in that coupled with the inner wheel.

The inner wheel and the outer wheel is characterized in that coupled without the use of a separate coupling member.

According to such a configuration, the inner wheel and the outer wheel have the advantage of preventing the breakage of the movable wheel by simultaneously restraining the shaft by injection molding alone without a separate fastening means.

4 is a perspective view showing the external configuration of an upright vacuum cleaner employing a preferred embodiment of the present invention.

As shown in the figure, the upright vacuum cleaner suctions the air containing the foreign matter through the suction nozzle body 100 which sucks the air containing the foreign matter while moving along the bottom surface, and the suction nozzle body 100. Means for generating a suction force for the built-in body 200, and is installed on the upper portion of the main body 200 has a configuration including a control unit 210 for holding the user when using the cleaner.

The suction nozzle body 100 is a portion that sucks air through a suction port (not shown) formed on the bottom surface. That is, the external appearance of the suction nozzle body 100 is composed of a nozzle upper cover 110 provided at the upper side and a nozzle lower cover 120 provided at the lower side, and a suction passage of external air in the nozzle lower cover 120. It is preferable that a suction port to be formed.

The main body 200 is configured to be rotatable within a predetermined angle range with respect to the suction nozzle body (100). That is, the main body 200 is coupled to be rotatable in a range of a predetermined inclination angle to the rear with respect to the suction nozzle body 100, in order to control the rotation of the main body 200 of the suction nozzle body 100 The pivoting lever 130 is further provided at the rear end of the upper surface.

Therefore, when the user grasps the operation unit 210 by hand and pulls the main body 200 backward while the user presses the pivot lever 130 with the foot, the main body 200 is inclined backward. This allows the user to clean the bottom surface while adjusting the main body 200 to the desired angle to suit the height of their own.

On the other hand, the rear of the main body 200, the wire fixing sphere 230 is formed. The wire fastener 230 is preferably formed in pairs symmetrically with respect to the upper and lower ends of the back of the main body 200, the wire 240 for applying power to the pair of wire fastener 230 is wound and stored.

The front surface of the main body 200 is equipped with a dust collecting unit 300 to filter the foreign matter sucked from the suction nozzle body (100). The dust collecting unit 300 generally filters foreign matters by a cyclone method, filters foreign matters through a separate filter, or simultaneously collects foreign matters by performing a cyclone method and a filter method. It is composed.

In addition, the dust collecting unit 300 is composed of a large cylindrical dust collecting cylinder 310, the upper cover 320 and the lower cover 330 to form the upper and lower surfaces of the dust collecting container 310, the upper cover The center of the 320 is provided with a removable groove 321 that is constrained by the removable knob 260 to be described below. In addition, the suction guide 312 is formed to protrude from the upper end of one side of the dust collector (310).

A motor (not shown) generating a suction force is embedded in the main body 200 to allow external air and foreign matter to be sucked through the suction nozzle body 100. In addition, a suction hose 250 formed of a flexible material is provided at a central portion of the main body 200 to allow foreign substances sucked through the suction nozzle body 100 to flow into the dust collecting unit 300.

 In addition, a front surface of the main body 200 has a detachable knob 260 used to separate the dust collecting unit 300 to the outside of the main body 200, and the main body 200 from the lower side of the detachable knob 260. The dust collector mounting portion 270 recessed to a part of the rear portion is formed. That is, the dust collecting unit 300 is inserted into the dust collecting and mounting unit 270 to be selectively detachable.

Inside the dust collecting installation part 270 is provided a dust collecting exhaust seal 280 that is a passage through which air is introduced. The dust collecting tube exhaust seal 280 is provided with a plurality of ventilation holes (not shown) to allow the air purified by the dust collecting unit 300 to flow into the motor.

The front edge of the dust collecting tube exhaust seal 280 is in surface contact with one side of the dust collecting unit, and serves to prevent air from leaking between the dust collecting unit 300 and the motor. Therefore, the dust collecting exhaust seal 280 is preferably formed of a material having a predetermined elasticity. For example, it may be molded from a rubber containing a predetermined elastic force.

On the other hand, the front lower portion of the main body 200 is provided with a lamp (L) is provided to be selectively lit by the user to light the front of the cleaner. Therefore, the lamp (L) serves to enable easy cleaning when cleaning the dark place, such as under the table or corners.

The right side of the lamp (L) is provided with a discharge unit 290 for discharging the air filtered by the dust collecting unit 300 to the outside of the main body 200 via the dust collecting exhaust seal 280. Although not shown, an exhaust filter is provided inside the discharge unit 290. The exhaust filter filters foreign matters of the air discharged to the outside (indoor space) to discharge more comfortable air to the indoor space.

On the other hand, the rear lower portion of the main body 200 is provided with a moving wheel 400 to easily move the main body 200 when performing the cleaning.

FIG. 5 is an exploded perspective view showing the moving wheel of the vacuum cleaner according to the present invention from the main body, and FIGS. 6 and 7 illustrate the top and bottom surfaces of the moving wheel of the vacuum cleaner according to the present invention. The front view showing the shaft provided in the moving wheel of the vacuum cleaner according to the present invention is shown.

As shown in these drawings, the moving wheel 400 is inserted into the insertion hole H, which is drilled in the rear lower portion of the main body 200, and rotates, and is rotated from the main body 200 by a snap ring S. Constrained so as not to deviate Therefore, the inner diameter of the insertion hole (H) is preferably drilled slightly larger than the outer diameter of the shaft 430 to be described below.

The moving wheel 400 includes an outer wheel 410 which is in contact with the bottom surface when the main body 200 moves in contact with the bottom surface, and an inner wheel that supports the load of the main body 200 and is provided inside the outer wheel 410. 420 and a shaft 430 inserted into and fixed to the center of the inner wheel 420 and the outer wheel 410 to serve as a rotation axis of the inner wheel 420 and the outer wheel 410. .

The shaft 430 has a predetermined length along the outer circumferential surface is recessed and molded to have a predetermined length along the outer circumferential surface of the other side of the separation preventing groove 432 and the release preventing groove 432. It has a configuration including a protruding molded friction portion 434, the friction portion 434 is simultaneously constrained by the center of the inner wheel 420 and the outer wheel 410.

 The shaft S is inserted into the insertion hole H and rotates to support the load of the moving wheel 400, and thus has a predetermined strength so as not to be deformed or damaged by friction or load. Molded is preferred.

9 is a plan view showing the appearance before the outer wheel is molded in the moving wheel of the vacuum cleaner of the present invention, Figure 10 is a cross-sectional view II-II 'of FIG.

As shown in these figures, a plurality of inner wheels 420 are formed radially from the center, between the support ribs 422 for supporting the load of the main body 200, and the support ribs 422. Recessed molded to a predetermined depth, the anti-rotation groove 424 coupled to one side of the outer wheel 410 and through-molded outside the upper surface of the inner wheel 420 when forming the outer wheel 410 It is configured to include a resin inlet hole 426 to allow the resin to flow.

On the other hand, an outer circumferential surface is formed outside the outer wheel 410, the contact portion 412 in contact with the bottom surface, and bent vertically to the end of the contact portion 412 so that the inner wheel wheel 420 is the outer wheel 410 A locking portion 414 is provided to restrain the lower portion of the lower portion from being separated. The locking portion 414 serves to prevent the inner wheel wheel 420 from escaping above the outer wheel 410 by restraining an upper end portion (as shown in FIG. 10) of the inner wheel 420.

In addition, a central portion 416 is formed at the center of the outer wheel 410 to form part of the outer surface of the moving wheel 400 at the center of the moving wheel 400 and to contact the outer circumferential surface of the friction portion 434; The anti-rotation protrusion 418 is protruded and formed in the lower portion of the central portion 416 and inserted into the anti-rotation groove 424. That is, the central portion 416 forms a central appearance of the moving wheel 400, and the inner side of the central portion 416 restrains the end of the shaft 430 so that the shaft 430 is not separated. .                     

The size of the anti-rotation protrusion 418 is formed larger in one side than the size of the anti-rotation groove 424 to simultaneously constrain the rotational direction and the central axis direction of the inner wheel 420 and the outer wheel 410, the inner ring The wheel 420 and the outer wheel 410 is restrained from being separated from each other.

In addition, the bottom surface of the outer wheel 410 is further provided with a connection portion 419 for connecting the anti-rotation protrusion 418 and the contact portion 412 to each other. The connecting portion 419 serves as a flow path so that the resin introduced into the resin inlet hole 426 may form the central portion 416 when the outer wheel wheel 410 is molded, and the central portion 416 is molded. When this is completed, the connecting portion 419 is fixed to the bottom surface of the inner wheel 420 to perform the role of constraining the inner wheel 420 and the outer wheel 410 at the same time.

Hereinafter, the operation of the vacuum cleaner and the moving wheel having the configuration as described above will be described.

First, when the vacuum cleaner is operated, suction power is generated by a motor (not shown) built in the main body 200. When the suction force is generated in this way, the air including the foreign matter is sucked by the suction nozzle body 100, and the air including the sucked foreign matter passes through the suction hose 250 to suction guide 312 of the dust collecting unit 300. Through the dust collector 310 is introduced into.

In addition, the air including the foreign matter introduced into the dust collecting container 310 is filtered in a predetermined manner, and the filtered purified air is discharged to the outside of the dust collecting unit 300 via the discharge guide pipe 316. . The air discharged to the outside of the dust collecting unit 300 passes through a dust collecting exhaust seal 280 formed in the dust collecting unit 270 via a motor (not shown) and then mounted on an outer surface of the main body 200. The cleaning is performed while being discharged to the outside of the cleaner through the discharge unit 290.

On the other hand, while the cleaning is performed, the moving wheel 400 serves to easily move the main body 200 in the direction in which the user is led.

Hereinafter, a process of forming and assembling the mobile wheel will be described with reference to FIGS. 8, 9, and 10.

First, as shown in FIG. 8, the primary molding is performed in a state in which the shaft 430 provided with the release preventing groove 432 and the friction part 434 are fixed in the mold. At this time, the escape preventing groove 432 is fixed to one side of the mold, the friction portion 434 is placed in the space state. When the shaft 430 is fixed, the injection resin is injected into the mold to be molded.

After the primary molding is completed in the state in which the shaft 430 is inserted into the mold, the friction part 434 of the shaft 430 penetrates the center of the inner wheel 420 as shown in FIG. 9. It becomes the state which protruded by predetermined height. In this state, secondary molding is performed again. In addition, the secondary molding proceeds in a state in which the separation preventing groove 432 of the shaft 430 is fixed in the mold, similarly to the primary molding.

When the primary molded product is fixed in the mold, resin is injected into the gate G of FIG. 10. When the resin is injected through the gate G, first, the contact portion 412 and the locking portion 414 are filled, and when the filling of the contact portion 412 and the locking portion 414 is completed, the resin is introduced into the resin. A central portion 416 is formed through the hole 426 and the connection portion 419.                     

When the resin flows into the central portion 416, the outer circumferential surface of the friction portion 434 of the shaft 430 protruding by a predetermined length is wrapped by the introduced resin, and the lower portion of the central portion 416 is moved. The center of the outer surface of the wheel 400 is molded by the filling of the resin.

When the resin is solidified after the filling of the resin is completed, the shaft 430 on which one side of the friction part 434 is fixed by the inner wheel 420 is also restrained by the outer wheel 410, thereby increasing the restraining force. As a result, the inner wheel 420 and the outer wheel 410 accommodating the shaft 430 are completely coupled to each other so as not to be disassembled and integrated, thereby forming the movable wheel 400.

When the molding of the moving wheel 400 is completed as described above, after the shaft 430 is inserted into the insertion hole H formed in the back of the suction nozzle body 100, the insertion hole 430 By fastening the snap ring S to the release preventing groove 432 protruding to the opposite side, the moving wheel 400 is firmly fixed to the insertion hole (H) so as not to be separated, so as to be rotatable inside the insertion hole (H). do.

The scope of the present invention is not limited to the above-exemplified embodiments, and many other modifications based on the present invention will be possible to those skilled in the art within the above technical scope.

The moving wheel of the vacuum cleaner according to the present invention as described above has the advantage that the restraint force is improved by the shaft being simultaneously constrained by the inner wheel and the outer wheel.                     

In addition, even if a large impact is caused by an obstacle such as a threshold while performing cleaning due to the improvement of the restraint force, there is an advantage that the inner wheel and the center of the outer wheel that surround the friction part of the shaft are not easily damaged.

In addition, since the outer wheel restrains the inner and outer sides of the inner wheel simultaneously, there is an advantage that the outer wheel is firmly fixed without being separated or sliding from the inner wheel.

In addition, there is an advantage that the productivity is improved, the manufacturing cost is reduced by fixing the inner wheel and the outer wheel without using a separate coupling member.

Claims (7)

An outer ring wheel 410 in contact with the bottom surface when the main body 200 moves under the main body 200 generating suction force; An inner wheel wheel 420 provided inside the outer wheel 410 and supporting a load of the main body 200; Movement of the vacuum cleaner including a shaft 430 inserted into and fixed at the center of the inner wheel 420 and the outer wheel 410 to serve as a rotation axis of the inner wheel 420 and the outer wheel 410. In wheels; The shaft 430 is, A separation prevention groove 432 having a predetermined depth along the outer circumferential surface and into which the snap ring S is inserted; It has a configuration including a friction portion 434 protrudingly formed with a predetermined length along the other outer peripheral surface of the departure prevention groove (432); The friction part 434 is a moving wheel of the vacuum cleaner, characterized in that fixed by the simultaneous restraint of the inner wheel 420 and the outer wheel 410. The method of claim 1, wherein the inner wheel 420, A plurality of support ribs 422 formed radially from the center of the inner wheel 420 to support the load of the main body 200; An anti-rotation groove 424 recessed and molded to a predetermined depth between the support ribs 422 and coupled to one side of the outer wheel 410; Moving wheel of the vacuum cleaner, characterized in that it comprises a resin inlet hole 426 through-molded outside the upper surface of the inner wheel wheel 420 so that the resin flows in forming the outer wheel wheel (410). The method of claim 1, wherein the outer wheel 410, A contact portion 412 forming an outer circumferential surface and contacting the bottom surface; A catching part 414 vertically bent at an end of the contact part 412 to restrain the inner wheel 420 from being separated from the lower part of the outer wheel 410; A central portion 416 which forms a part of the upper surface of the moving wheel 400 at the center of the moving wheel 400 and contacts the outer circumferential surface of the friction part 434; A anti-rotation protrusion 418 protruded and formed in the lower portion of the central portion 416 and inserted into the anti-rotation groove 424;  The wheel of the vacuum cleaner, characterized in that it comprises a connecting portion (419) for connecting the anti-rotation protrusion (418) and the contact portion (412) on the bottom surface of the inner wheel (420). The wheel of claim 3, wherein the anti-rotation protrusion (418) is formed to be larger in one side than the size of the anti-rotation groove (424). 5. The moving wheel of claim 4, wherein the anti-rotation protrusion (418) simultaneously constrains the rotational direction and the central axis direction of the inner wheel 420 and the outer wheel 410. 4. The moving wheel of claim 1 or 3, wherein the outer wheel (410) is injection molded and coupled to the inner wheel (420). The wheel of claim 1, wherein the inner wheel 420 and the outer wheel 410 are coupled without the use of a separate coupling member.

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