KR101953640B1 - Cleaner - Google Patents

Abstract

The present invention provides a vacuum cleaner comprising: a vacuum cleaner main body having a control unit; A wheel cover mounted on the cleaner main body; A drive module movably coupled to the wheel cover up and down; A drive wheel coupled to the drive module and configured to be rotatable by receiving a drive force from the drive module; A guide bar coupled to the wheel cover and disposed vertically, the guide bar being formed to penetrate the drive module and guiding the up and down movement of the drive module; And an elastic member which is formed to surround the guide bar and is connected to the wheel cover and the driving module, respectively, and absorbs an impact when the driving module is moved up and down.

Description

Cleaner {CLEANER}

The present invention relates to a vacuum cleaner having a driving wheel for moving a cleaner main body.

The cleaner is a device that performs cleaning functions by suctioning dust or foreign matter or cleaning it. Generally, the vacuum cleaner performs a cleaning function on the floor, and the vacuum cleaner includes a wheel for movement.

Generally, the wheel is rolled by an external force applied to the cleaner main body to move the cleaner main body relative to the floor. In recent years, however, a robotic vacuum cleaner has been developed which carries out cleaning while traveling by itself without user's operation, and a vacuum cleaner which moves by itself along a nozzle moved by a user's operation. A wheel is required.

In order for the cleaner to have a stable running performance, the driving wheel must be grounded at the bottom even if the condition or condition of the floor changes, and the shock generated at this time should be buffered. In this connection, in Korean Patent Laid-Open Publication No. 10-2016-0121844 (published on October 21, 2016), a drive wheel is connected to a drive arm which rotates about a rotation axis, and an elastic member is connected to the housing and the drive arm, Of the suspension structure.

There is a problem in that the structure has a difference in suspension performance depending on the rotating direction of the driving wheel. For example, if the driving wheel has a good suspension performance in the clockwise direction, the suspension performance is not ensured when the driving wheel rotates counterclockwise, as long as the driving wheel rotates clockwise.

In addition, a drive motor is connected to one side of the drive arm having the gear portion in the above structure, and a drive wheel is connected to the other side of the drive arm. Accordingly, there is a problem in that the space required for the driving motor, the driving arm, and the driving wheel is required, respectively, so that they occupy a large space in the vacuum cleaner.

Although the drive unit is modularized to a certain degree, a wiring connection process for electrical connection between the drive motor and the power supply unit is required separately from the drive unit mounting process. For example, a cover) may be additionally mounted. Such a complicated assembling structure raises the defect rate and causes a secondary defect in which the other components are broken at the time of disassembly for repair or the like.

In addition, there may be a case where the driving wheel continuously rotates when the cleaner main body is caught by an obstacle and the driving wheel is idled or the cleaner main body is lifted by the user. This can be an obstacle to high-end in terms of stability and user's sensitivity.

Korean Patent Publication No. 10-2016-0121844 (published on October 21, 2016)

A first object of the present invention is to provide a vacuum cleaner capable of exhibiting the same suspension performance regardless of the direction of rotation of the driving wheel.

A second object of the present invention is to provide a vacuum cleaner in which the structure related to the driving of the driving wheels is miniaturized.

A third object of the present invention is to provide a cleaner which can easily be attached to the main body of the cleaner and can be electrically connected to the main body of the cleaner.

A fourth object of the present invention is to provide a vacuum cleaner that physically senses when the drive wheel does not contact the floor surface and controls the rotation of the drive wheel.

According to an aspect of the present invention, there is provided a vacuum cleaner comprising: a vacuum cleaner main body having a control unit; A wheel cover mounted on the cleaner main body; A drive module movably coupled to the wheel cover up and down; A drive wheel coupled to the drive module and configured to be rotatable by receiving a drive force from the drive module; A guide bar coupled to the wheel cover and disposed vertically, the guide bar being formed to penetrate the drive module and guiding the up and down movement of the drive module; And an elastic member that is formed to surround the guide bar and is connected to the wheel cover and the drive module, respectively, to absorb an impact when the drive module moves up and down.

A first object of the present invention is to provide a cleaner main body having a control unit; A drive module including a case coupled to the wheel house of the cleaner body movably up and down, a drive motor mounted to the case, and a planetary gear set for reducing rotation of the drive motor; A driving wheel connected to the planetary gear device and configured to be rotatable; A guide bar coupled to the wheel house and vertically disposed, the guide bar being formed to penetrate the case and guiding the case up and down; And an elastic member which is formed to surround the guide bar and is connected to the wheel house and the case and absorbs an impact when the case is moved up and down.

In order to achieve the second object of the present invention, the vacuum cleaner of the present invention comprises: a vacuum cleaner main body having a control unit; A wheel cover mounted on the cleaner main body; A drive module including a case movably coupled to the wheel cover, a drive motor mounted to the case, and a planetary gear set for reducing rotation of the drive motor; A driving wheel connected to the planetary gear device and configured to be rotatable; And a suspension for guiding up and down movement of the case and absorbing an impact upon up-down movement of the case, wherein the rotation axis of the drive motor and the rotation axis of the drive wheel are on the same axis, A receiving portion for receiving the planetary gear device is formed.

A second object of the present invention is to provide a vacuum cleaner comprising: a cleaner main body having a control unit; A drive module including a case coupled to the wheel house of the cleaner body movably up and down, a drive motor mounted to the case, and a planetary gear set for reducing rotation of the drive motor; A driving wheel connected to the planetary gear device and configured to be rotatable; And a suspension for guiding up and down movement of the case and absorbing an impact upon up-down movement of the case, wherein the rotation axis of the drive motor and the rotation axis of the drive wheel are on the same axis, And can be achieved by a vacuum cleaner in which an accommodating portion for accommodating the planetary gear device is formed.

In order to achieve the third object of the present invention, the vacuum cleaner of the present invention comprises: a vacuum cleaner main body having a mounting portion formed in a bottom portion thereof to be recessed upward; And a wheel assembly detachably mounted on the mounting portion, wherein a first connector is disposed on the inner surface of the mounting portion facing the opening of the mounting portion so as to face the opening, and the wheel assembly is mounted on the upper portion of the wheel assembly And a second connector connected to the first connector when the connector is accommodated in the mounting portion.

The cleaner may further include a coupling unit coupling the wheel assembly to the cleaner main body while the wheel assembly is housed in the mounting unit.

In order to achieve the fourth object of the present invention, a vacuum cleaner of the present invention comprises: a vacuum cleaner main body having a control unit; A wheel cover mounted on the cleaner main body; A drive module movably coupled to the wheel cover up and down; A drive wheel coupled to the drive module and configured to be rotatable by receiving a drive force from the drive module; A suspension guiding the up and down movement of the drive module and absorbing an impact when the drive module is moved up and down; A link member rotatably installed on the wheel cover and rotated by contacting the projection of the driving module when the driving module is moved downward by a predetermined distance; And a switch that is pressed by the rotation of the link member and transmits a pressing signal to the control unit.

A fourth object of the present invention is to provide a cleaner main body having a control unit; A drive module including a case coupled to the wheel house of the cleaner body movably up and down, a drive motor mounted to the case, and a planetary gear set for reducing rotation of the drive motor; A driving wheel connected to the planetary gear device and configured to be rotatable; A link member rotatably installed on the wheel house and rotated in contact with a projection formed on the case when the case is moved downward by a predetermined distance; And a switch that is pressed by the rotation of the link member and transmits a pressing signal to the control unit.

The above-described inventions can be configured as follows.

The driving module may include a case having a through hole through which the guide bar passes; A drive motor mounted on the case; And a planetary gear device that connects the drive motor and the drive wheel, decelerates the rotation of the drive motor, and transmits the decelerated rotation to the drive wheel.

The planetary gear device includes: a first planetary gear unit interlocked with a rotation shaft of the drive motor; And a second planetary gear unit interlocked with the first planetary gear unit and connected to the drive wheel.

The case includes a main case having the through-hole, the main case being mounted with the driving motor and receiving the first planetary gear unit; A middle case coupled to the main case and disposed to cover the first planetary gear unit, the middle case receiving the second planetary gear unit; And a front case coupled to the middle case and disposed to cover the second planetary gear unit.

The first planetary gear unit includes: a first sun gear coupled to a rotation shaft of the drive motor; A first ring gear formed in the main case and accommodating a first sun gear therein; A plurality of first planetary gears that engage with the first sun gear and the first ring gear and revolve in a direction opposite to the rotation direction of the first sun gear and revolve around the first sun gear in the same direction as the rotation direction of the first sun gear, Gear; And a first cage rotatably supporting a rotation axis of each of the plurality of first planetary gears.

The second planetary gear unit includes: a second sun gear formed on the first cage; A second ring gear formed in the middle case and accommodating a second sun gear therein; And a plurality of second planetary gears engaged with the second sun gear and the second ring gear and revolving in a direction opposite to the rotation direction of the second sun gear and revolving about the second sun gear in the same direction as the rotation direction of the second sun gear, Gear; And a second cage rotatably supporting a rotation axis of each of the plurality of second planetary gears.

The second cage may be formed with a coupling protrusion for engaging the driving wheel with the coupling groove to prevent the driving wheel from being idle.

Wherein the wheel cover or the wheel house includes: a first fixing part to which an upper end of the guide bar is fixed; And a second fixing part formed to face the first fixing part and fixed to a lower end of the guide bar, wherein the case is vertically movable between the first fixing part and the second fixing part by the guide bar And can be configured to be movable.

And the case may be hooked to the second fixing part when the case is moved downward by a certain distance.

The elastic member may be connected to the first fixing part and the case, respectively.

The control unit may be configured to stop driving the driving motor when the switch is pressed.

The link member includes: a first link that is exposed to one side of the wheel cover where the projection is located; And a second link coupled to the first link and exposed to the other side of the wheel cover on which the switch is located.

Effects of the present invention obtained through the above-mentioned solution are as follows.

According to the present invention, the driving module coupled to the driving wheel is configured to be movable up and down along the guide bar, and the elastic member absorbs impact generated when the driving module is moved up and down, Can be exerted uniformly irrespective of the rotating direction of the driving wheel.

Second, a gear device for reducing the rotation of the drive motor and transmitting the drive motor to the drive wheel is constituted by a planetary gear device, so that the rotation axis of the drive motor and the rotation axis of the drive wheel are on the same axis, and the planetary gear device is formed on the inner side By being accommodated in the accommodating portion, the structure related to the driving of the driving wheel can be miniaturized. This may contribute to miniaturization of the vacuum cleaner or to increase the volume of other components (for example, a dust bin).

Third, when the wheel assembly is inserted into the mounting portion formed on the cleaner main body, the first connector provided on the mounting portion is connected to the second connector provided on the wheel assembly, so that mounting and electrical connection of the wheel assembly to the cleaner main body is easy have. In addition, since the wheel assembly can be separated from the main body of the cleaner in the event of a problem of the wheel assembly, it can be inspected, repaired, replaced, and the like.

Fourth, when the drive module moves downward by a predetermined distance, there occurs a situation in which the projection of the drive module rotates the link member, and the drive wheel does not touch the floor surface by the mechanism in which the rotated link member presses the switch The rotation of the drive wheel can be controlled (for example, stopped). According to this, the stability can be improved and the user's satisfaction can be improved.

1 is a perspective view showing an example of a vacuum cleaner according to the present invention.
2 is a side view of the vacuum cleaner shown in Fig.
Figs. 3 and 4 are perspective views of the wheel assembly of Fig. 2 viewed from different directions. Fig.
FIGS. 5 and 6 are conceptual views showing that the wheel assembly is detachably coupled to the bottom of the cleaner body shown in FIG. 2. FIG.
Figures 7 and 8 are exploded perspective views of the wheel assembly of Figure 3 viewed from different directions.
Figure 9 is a cross-sectional view of the wheel assembly of Figure 3 taken along line AA;
FIG. 10 and FIG. 11 are conceptual views showing a state in which the driving wheel is moved upward and the wheel is moved downward in the wheel assembly of FIG. 3;
12 is an exploded perspective view of the drive module shown in Fig.
Figure 13 is a cross-sectional view of the wheel assembly of Figure 3 taken along line BB;
FIG. 14 is a conceptual view showing a state in which the drive module is moved upward in the wheel assembly of FIG. 3, in front view (a) and rear view (b), respectively.
FIG. 15 is a conceptual view showing a state in which the drive module is moved downward in the wheel assembly of FIG. 3, in a front view (a) and a rear view (b), respectively.
16 is a conceptual view showing the link member shown in Fig.

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, a cleaning machine according to the present invention will be described in detail with reference to the drawings.

The singular expressions include plural expressions unless the context clearly dictates otherwise.

In the following description of the embodiments of the present invention, a detailed description of related arts will be omitted when it is determined that the gist of the embodiments disclosed herein may be obscured.

It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory and are intended to provide further explanation of the invention as claimed. It should be understood that it includes water and alternatives.

FIG. 1 is a perspective view showing an example of a vacuum cleaner 100 according to the present invention, and FIG. 2 is a side view of the vacuum cleaner 100 shown in FIG.

1 and 2 illustrate a robot cleaner 100 that performs a function of cleaning a floor while traveling in a certain area by itself. Cleaning of the floor mentioned here includes suction of dust and foreign matter on the floor or mopping the floor.

The cleaner 100 includes a cleaner main body 110 and a drive wheel 123.

The cleaner main body 110 forms the appearance of the vacuum cleaner 100. The vacuum cleaner main body 110 includes various components including a control unit (not shown) for controlling the vacuum cleaner 100.

The cleaner main body 110 is provided with a driving wheel 123 for traveling. The driving wheel 123 is configured to be rotatable by receiving a driving force from the driving motor 122b. The rotational direction of the driving motor 122b can be controlled by the control unit, and thus the driving wheel 123 can be configured to be rotatable in one direction or another direction.

The driving wheels 123 may be provided on both left and right sides of the cleaner main body 110, respectively. The cleaner main body 110 can be moved forward or backward and leftward or rightward by the drive wheel 123. Each of the driving wheels 123 can be configured to be drivable independently of each other. To this end, each drive wheel 123 may be driven by a different drive motor 122b.

The vacuum cleaner 100 may further include an auxiliary wheel 140. The auxiliary wheel 140 supports the cleaner main body 110 together with the driving wheel 123 and assists the traveling of the cleaner 100 by the driving wheel 123.

The cleaner 100 may include at least one of a suction unit 150 and a mop unit (not shown) according to a cleaning function.

When the vacuum cleaner 100 is configured to suck dust and foreign substances on the floor, the vacuum cleaner 100 may have a suction unit 150. The suction unit 150 is configured to suck air containing dust and foreign matter by using a suction force generated by a motor (not shown) and a fan (not shown). The suction unit 150 may be disposed on the bottom of the cleaner main body 110, or may protrude from the cleaner main body 110 as shown in FIG.

The suction unit 150 may include an opening (not shown) for sucking air containing dust and foreign matter. The opening may be formed to face the bottom. The brush unit 151 configured to sweep the dust on the floor by rotary driving can be detachably mounted on the opening. The auxiliary wheel 140 may also be provided in the suction unit 150.

Dust and foreign substances in the air sucked through the suction unit 150 are filtered and collected in the dust container 160 and air in which dust and foreign matter are separated is discharged to the outside of the cleaner 100. The cleaner main body 110 is provided with an intake passage (not shown) for guiding the flow of the air from the suction portion 150 to the dust container 160 and a flow passage for guiding the flow of air from the dust container 160 to the outside of the cleaner 100 An exhaust passage (not shown) for guiding can be formed. The dust container 160 may include at least one of a filter and a cyclone for filtering dust and foreign matter in the air.

The cleaner 100 may include a dust container case 170 covering the dust container 160. The dust container 160 can be prevented from being separated from the cleaner main body 110 by the dust container case 170 when the dust container case 170 is disposed to cover the upper surface of the dust container 160. [

In the figure, the dust container case 170 is hinged to the cleaner main body 110 to be rotatable. The dust container cover 170 may be fixed to the dust container 160 or the cleaner body 110 to cover the upper surface of the dust container 160.

When the vacuum cleaner 100 is configured to wipe the floor, the vacuum cleaner 100 may have a mop. The mop can be detachably mounted on the bottom of the cleaner main body 110.

The mop part can be mounted on the cleaner main body 110 in place of the suction part 150. Alternatively, the mop part can be attached to the opening of the suction part 150 in place of the brush unit 151. [ Accordingly, the user can selectively mount the suction unit 150 or the mop according to the purpose of cleaning.

The cleaner main body 110 may be provided with a sensing unit 180 for sensing the circumstance of the cleaner main body 110. The control unit can sense an obstacle, detect a land feature, or generate a map of a driving area through the sensing unit 180. [

Hereinafter, the driving wheel 123 provided in the vacuum cleaner 100 will be described in more detail.

FIGS. 3 and 4 are perspective views of the wheel assembly 120 of FIG. 2 viewed from different directions. FIG. 5 and FIG. 6 are views showing a state where the wheel assembly 120 is detachably attached to the bottom of the cleaner body 110 shown in FIG. Are combined.

3 to 6, the wheel assembly 120 includes a driving module 122 for generating a driving force, a driving wheel 123 configured to be rotatable by receiving a driving force from the driving module 122, And a wheel cover 121 disposed to cover the upper portion of the driving wheel 123 and the driving wheel 123. The wheel assembly 120 may be detachably coupled to the cleaner body 110.

To this end, a mounting portion 110a for receiving the wheel assembly 120 is formed on the cleaner main body 110. [ In this figure, the mounting portion 110a is formed to be recessed toward the upper portion of the bottom of the cleaner main body 110.

The first connector 130 is disposed on the inner surface of the mounting portion 110a. The first connector 130 may be disposed to face the opening 110a 'on the inner surface of the mounting portion 110a facing the opening 110a' of the mounting portion 110a. The first connector 130 is electrically connected to the control unit.

The wheel assembly 120 is provided with a second connector 127. The second connector 127 is electrically connected to the electronic component of the wheel assembly 120. For example, the second connector 127 may be electrically connected to the drive module 122. An electric wire (not shown) may be used for electrical connection between the wheel assembly 120 and the electronic component. The electric wire may be exposed to the outside of the wheel cover 121.

The second connector 127 is configured to be connected to the first connector 130 when the wheel assembly 120 is received in the mounting portion 110a. The second connector 127 corresponding to the first connector 130 is provided on the upper portion of the wheel assembly 120 facing the inner surface when the mounting portion 110a is accommodated.

The connection direction of the first connector 130 and the second connector 127 corresponds to the direction in which the wheel assembly 120 is received in the mounting portion 110a. The mounting portion 110a guides the reception of the wheel assembly 120 so that the first connector 130 and the second connector 127 can be connected at the correct positions.

When the wheel assembly 120 is inserted into the mounting portion 110a formed in the cleaner main body 110 according to the above-described structure, the first connector 130 provided in the mounting portion 110a is inserted into the second And is configured to be connected to the connector 127. Therefore, mounting and electrical connection of the wheel assembly 120 to the cleaner main body 110 can be easily performed. In addition, since the wheel assembly 120 can be separated from the cleaner main body 110 only when the wheel assembly 120 is in trouble, it can be inspected, repaired, replaced, and the like.

The wheel assembly 120 is firmly fixed to the cleaner main body 110 by the fastening portion in a state where the wheel assembly 120 is received in the mount portion 110a and the first and second connectors 130 and 127 are interconnected . The fastening part may include a hook coupling structure between the wheel assembly 120 and the mounting part 110a, a screw fastening structure, or the like. In this figure, the fastening portion is composed of a fastening hole 121d formed in the wheel cover 121 and a fastening member 111 screwed to the cleaner body 110 through the fastening hole 121d.

The second connector 127 can be electrically connected to the switch 126, the cliff sensor 129, and the like as well as the driving module 122 described above.

The switch 126 senses a downward movement of the driving wheel 123 due to sagging and is electrically connected to the control unit to transmit the sensing signal. This will be described in detail later.

The cliff sensor 129 includes a light emitting portion and a light receiving portion, and measures the time at which the light emitted from the light emitting portion to the bottom is received by the light receiving portion, thereby measuring the distance between the cliff sensor 129 and the floor. Therefore, in the case where there is a sudden lowering step in the forward direction, the received time rapidly increases. When there is a cliff in front, light is not received by the light receiving unit.

Therefore, the terrain on the lower side of the wheel assembly 120 can be detected by the cliff sensor 129. The control unit is configured to control driving of the driving module 122 when it is detected that the downward terrain is lowered to a certain level or more through the cliff sensor 129. For example, the control unit may apply a driving signal in the opposite direction to the driving module 122 so that the vacuum cleaner 100 travels in the opposite direction. Alternatively, the controller may apply a driving signal to the driving module 122 of one of the wheel assemblies 120 or apply different driving signals to the left and right wheel assemblies 120 so that the vacuum cleaner 100 rotates.

Meanwhile, the structure in which the above-described electrical connection is simultaneously performed is not limited to the mounting structure of the wheel assembly 120 with respect to the cleaner main body 110. The above structure can be applied to any electronic component mounted on the cleaner body 110. [

For example, a battery 190 for supplying power to the vacuum cleaner 100 is mounted on the cleaner main body 110. The battery 190 is configured to be chargeable and detachable from the battery accommodating portion formed at the bottom of the cleaner main body 110.

The battery receiving portion is formed in a shape corresponding to the battery 190, and a third connector (not shown) is disposed on the inner surface facing the opening. A fourth connector (not shown) corresponding to the third connector is disposed on the upper surface of the battery 190 facing the inner surface when the battery is housed in the battery accommodating portion. With this structure, when the battery 190 is received in the battery accommodating portion, the third connector and the fourth connector can be interconnected.

FIGS. 7 and 8 are exploded perspective views of the wheel assembly 120 of FIG. 3 viewed from different directions, and FIG. 9 is a cross-sectional view of the wheel assembly 120 of FIG. 3 taken along line A-A.

7 to 9, the wheel assembly 120 includes a wheel cover 121, a driving module 122, a driving wheel 123, and a suspension 124.

The wheel cover 121 is disposed to cover the upper portion of the driving wheel 123 and the driving module 122 and is detachably coupled to the cleaner body 110. A second connector 127 connected to the first connector 130 is provided on the upper portion of the wheel cover 121 and a fastening member 111 for fixing the cleaner body 110 to the lower portion of the wheel cover 121 A fastening hole 121d can be formed.

The driving module 122 is configured to generate a driving force to transmit a driving force to the driving wheel 123, and is coupled to the wheel cover 121 so as to be movable up and down. Up and down movement of the drive module 122 can be guided by the guide bar 124a of the suspension 124. [ The detailed configuration of the driving module 122 will be described later in detail.

The driving wheel 123 is coupled to the driving module 122 and configured to be rotatable by receiving a driving force from the driving module 122. The driving wheel 123 is configured to be movable up and down with the top covered by the wheel cover 121 together with the driving module 122.

The suspension 124 guides the up and down movement of the drive module 122 and absorbs the impact when the drive module 122 moves up and down. By providing the suspension 124, an impact applied to the cleaner main body 110 when the drive wheel 123 passes over a rugged portion or a jaw can be reduced.

The suspension 124 includes a guide bar 124a and an elastic member 124b.

The guide bar 124a is configured to guide the vertical movement of the drive module 122. [ The guide bar 124a is formed to extend in one direction and is disposed above and below the wheel cover 121 through the drive module 122. [ In this figure, the guide bars 124a are formed to pass through the left and right sides of the drive module 122, respectively.

The upper and lower ends of the guide bar 124a are fixed to the wheel cover 121. The upper end of the guide bar 124a is fixed to the first fixing portion 121a formed on the upper portion of the wheel cover 121 and the lower end of the guide bar 124a is formed on the lower portion of the wheel cover 121 And is fixed to the second fixing portion 121b. The first fixing portion 121a and the second fixing portion 121b are formed to face each other in the vertical direction of the wheel cover 121. [

The driving module 122 is configured to be movable up and down by a guide bar 124a between the first fixing portion 121a and the second fixing portion 121b.

The elastic member 124b is configured to absorb an impact when the drive module 122 is moved up and down. The elastic member 124b may be connected to the wheel cover 121 and the driving module 122, respectively. The elastic member 124b is formed of a coil spring that surrounds the guide bar 124a and is connected to the first fixing portion 121a of the wheel cover 121 and the upper portion of the drive module 122 .

A separate elastic member may be additionally provided separately from the elastic member 124b and connected to the second fixing portion 121b of the wheel cover 121 and the lower portion of the driving module 122, It is possible.

10 and 11 are conceptual diagrams showing the state in which the driving wheel 123 is moved upward and the wheel is moved downward in the wheel assembly 120 of FIG.

10 and 11, the driving module 122 is configured to be movable up and down with respect to the wheel cover 121 along the guide bar 124a of the suspension 124. As shown in FIG. The drive wheel 123 is coupled to the drive module 122 and therefore moves with the drive module 122. That is, the driving wheel 123 is configured so as to be movable up and down with the top covered by the wheel cover 121 together with the driving module 122.

Up and down movement of the drive module 122 and the drive wheel 123 is closely related to the state where the drive wheel 123 is grounded on the floor.

10 shows a first state in which the driving wheel 123 is grounded on the floor and supports the cleaner main body 110. Fig. That is, the weight of the cleaner main body 110 is loaded on the driving wheel 123 and the driving wheel 123 is lifted up.

In the first state, the drive wheel 123 is accommodated in the wheel cover 121 at the maximum. As shown, the center of the driving wheel 123 may be located in the wheel cover 121. [

Figure 11 shows a second state in which drive wheel 123 loses ground to the floor. That is, the driving wheel 123 does not touch the floor, and the driving wheel 123 is in a downward position. This can be understood as a case in which the driving wheel 123 rotates when the cleaner main body 110 is caught by an obstacle or when the cleaner main body 110 is lifted by the user.

In the second state, the drive wheel 123 is received in the wheel cover 121 at a minimum. As shown, the center of the drive wheel 123 may be located below the wheel cover 121. [

The ground state of the driving wheel 123 with respect to the floor may vary depending on the condition or condition of the floor while the cleaner main body 110 travels. The driving wheel 123 moves up and down between the first state shown in Fig. 10 and the second state shown in Fig. 11 depending on the grounding state with respect to the floor in the running process, 123 and the driving module 122 connected thereto.

According to the above structure, the grounding function and the shock buffering function can be exerted uniformly irrespective of the rotating direction of the driving wheel 123. Therefore, the running stability of the vacuum cleaner 100 can be improved.

Fig. 12 is an exploded perspective view of the drive module 122 shown in Fig. 7, and Fig. 13 is a cross-sectional view taken along line B-B of the wheel assembly 120 of Fig.

12 and 13, the drive module 122 includes a case 122a, a drive motor 122b, and a planetary gear device.

A through hole 122a1a through which the guide bar 124a passes is formed in the case 122a. The through holes 122a1a may be formed on both the left and right sides of the case 122a. The case 122a is configured to be movable up and down along the guide bar 124a.

A drive motor 122b is mounted on one side of the case 122a. And the driving motor 122b is electrically connected to the second connector 127. [

The planetary gear device 122c connects the drive motor 122b and the drive wheel 123 and decelerates the rotation of the drive motor 122b and transmits the decelerated rotation to the drive wheel 123b. The planetary gear device 122c is provided on the other side of the case 122a.

The planetary gear device 122c may be configured in one or more stages. In the figure, it is shown that the planetary gear device 122c is composed of two stages.

A sun gear is mounted on a rotation shaft of the drive motor 122b, and a drive wheel 123 is mounted on a cage which rotatably supports the rotation axis of each of the plurality of planetary gears. With this structure, the rotation axis of the drive motor 122b and the rotation axis of the drive wheel 123 are on the same axis.

6 and 8, a receiving portion 123a for receiving at least a part of the driving module 122 is formed on the inside of the driving wheel 123. As shown in FIG. The planetary gear device 122c is completely accommodated in the accommodating portion 123a so that the periphery of the planetary gear device 122c may be surrounded by the drive wheels 123. [ Therefore, the planetary gear device 122c is not visible outside.

The gear device for transmitting the rotation to the drive wheel 123 by the rotation of the drive motor 122b is configured by the planetary gear device 122c so that the rotation axis of the drive motor 122b and the rotation axis of the drive wheel 123 are on the same axis And the planetary gear device 122c is accommodated in the accommodating portion 123a formed inside the driving wheel 123 so that the structure related to the driving of the driving wheel 123 can be miniaturized. This can contribute to miniaturization of the vacuum cleaner 100 or to increase the volume of another structure (for example, the dust container 160).

In order to obtain an appropriate reduction ratio, the planetary gear set 122c may be composed of a combination of the first planetary gear unit 122c1 and the second planetary gear unit 122c2, i.e., two stages. The first planetary gear unit 122c1 is interlocked with the rotation shaft of the drive motor 122b. The second planetary gear unit 122c2 is interlocked with the first planetary gear unit 122c1 and connected to the driving wheel 123. [

Specifically, the case 122a includes a main case 122a1, a middle case 122a2, and a front case 122a3.

The main case 122a1 has a through hole 122a1a through which the guide bar 124a passes. A drive motor 122b is mounted on one side of the main case 122a1 and a first planetary gear portion 122c1 is accommodated on the other side of the main case 122a1. The rotation axis of the drive motor 122b is formed to penetrate the main case 122a1. The cover 122d may be disposed so as to cover the drive motor 122b and be coupled to the main case 122a1.

The first planetary gear unit 122c1 includes a first sun gear 122c1a, a first ring gear 122c1b, a plurality of first planetary gears 122c1c, and a first cage 122c1d.

The first sun gear 122c1a is coupled to the rotation shaft of the driving motor 122b and is exposed to the other side of the main case 122a1 through the hole 122a1 '. The first sun gear 122c1a may be configured to be rotatable in both directions according to a driving signal applied from the control unit.

The first ring gear 122c1b is formed so as to surround the first sun gear 122c1a on the other side of the main case 122a1. The first sun gear 122c1a is disposed at the center of the first ring gear 122c1b. As shown, the first ring gear 122c1b may be formed in the main case 122a1 itself.

The plurality of first planetary gears 122c1c engage with the first sun gear 122c1a and the first ring gear 122c1b and are configured to revolve about the first sun gear 122c1a at the same time as the second sun gear 122c1a. In this structure in which the first ring gear 122c1b is fixed, the rotational direction of each of the plurality of first planetary gears 122c1c is opposite to the rotational direction of the first sun gear 122c1a, and the idle direction is the first sun gear 122c1a.

The first cage 122c1d rotatably supports the rotation axis of each of the plurality of first planetary gears 122c1c. The first cage 122c1d is arranged to cover a part of each of the plurality of first planetary gears 122c1c. The first cage 122c1d may be arranged to cover the first sun gear 122c1a, in which case it may be configured to rotatably support the rotation axis of the first sun gear 122c1a.

The middle case 122a2 is coupled to the main case 122a1. One side of the middle case 122a2 is arranged to cover the first planetary gear unit 122c1 and a second planetary gear unit 122c2 is accommodated on the other side of the middle case 122a2. A hole 122a2 'for connection between the first planetary gear unit 122c1 and the second planetary gear unit 122c2 is formed in the middle case 122a2.

The second planetary gear unit 122c2 includes a second sun gear 122c2a, a second ring gear 122c2b, a plurality of second planetary gears 122c2c, and a second cage 122c2d.

The second sun gear 122c2a is protruded from the first cage 122c1d and exposed to the other side of the middle case 122a2 through the hole 122a2 '.

The second ring gear 122c2b is formed on the other side of the middle case 122a2 so as to surround the second sun gear 122c2a. And the second sun gear 122c2a is disposed at the center of the second ring gear 122c2b. As shown, the second ring gear 122c2b may be formed in the middle case 122a2 itself.

The plurality of second planetary gears 122c2c engage with the second sun gear 122c2a and the second ring gear 122c2b and are configured to revolve about the second sun gear 122c2a at the same time as the second sun gear 122c2a. In the present structure in which the second ring gear 122c2b is fixed, the rotational direction of each of the plurality of second planetary gears 122c2c is opposite to the rotational direction of the second sun gear 122c2a, and the idle direction is the second sun gear 122c2a.

The second cage 122c2d rotatably supports the rotation axis of each of the plurality of second planetary gears 122c2c. The second cage 122c2d is arranged to cover a part of each of the plurality of second planetary gears 122c2c. The second cage 122c2d may be arranged to cover the second sun gear 122c2a, and in this case, be configured to rotatably support the rotation axis of the second sun gear 122c2a.

The front case 122a3 is coupled to the middle case 122a2 and is disposed so as to cover the second planetary gear portion 122c2. A hole 122a3 'for connection between the second planetary gear unit 122c2 and the driving wheel 123 is formed in the front case 122a3.

The second cage 122c2d is formed with a protrusion to be inserted into the hole 122a3 'and a coupling protrusion 122c2d' for engaging with the coupling groove 123b of the driving wheel 123 is formed in the protrusion. The engaging projections 122c2d 'are engaged with the engaging grooves 123b so as to prevent the driving wheels 123 from being idle during rotation by receiving the driving force through the planetary gear set 122c.

The engaging member 128 is fastened to the second cage 122c2d through the driving wheel 123 so that the driving wheel 123 can be firmly fixed to the planetary gear device 122c.

FIG. 14 is a conceptual view showing a state in which the drive module 122 is moved upward in the wheel assembly 120 of FIG. 3, and FIG. 15 is a schematic view of the wheel assembly 120 And FIG. 16 is a conceptual view showing the link member 125 shown in FIG. 14. In FIG. 16, the drive module 122 is moved downward in FIG.

Fig. 14 corresponds to the first state shown in Fig. 10, and Fig. 15 corresponds to the second state shown in Fig. For reference, in FIGS. 14A and 15A, the driving wheel 123 is omitted for convenience of explanation.

14 to 16, the driving module 122 is configured to be movable up and down along the guide bar 124a of the suspension 124. [ The drive wheel 123 is coupled to the drive module 122 and therefore moves with the drive module 122.

14 shows the first state in which the driving module 122 is moved to the maximum position. This shows a state in which the driving wheel 123 is grounded to support the cleaner main body 110.

In the first state, the planetary gear device 122c is accommodated in the wheel cover 121 at the maximum. As shown in the figure, the center of the planetary gear device 122c may be located in the wheel cover 121.

In the first state, the upper end of the case 122a of the driving module 122 is placed at a maximum distance from the second fixing portion 121b. The upper end of the case 122a may be disposed adjacent to the first fixing portion 121a.

In the first state, the elastic members 124b connected to the first fixing portions 121a and the case 122a, respectively, are compressed to the maximum.

15 shows a second state in which the driving module 122 is moved to the maximum position downward. This indicates that the driving wheel 123 has lost ground to the floor.

In the second state, the planetary gear device 122c is accommodated in the wheel cover 121 at a minimum. As shown in the figure, the center of the planetary gear device 122c may be located under the wheel cover 121.

In the second state, the case 122a of the drive module 122 is engaged with the second fixing portion 121b. That is, the case 122a is caught by the second fixing portion 121b, so that the downward movement of the driving module 122 is restricted. The upper end of the case 122a is placed at the maximum distance from the first fixing portion 121a.

In the second state, the elastic member 124b connected to the first fixing portion 121a and the case 122a is pulled to the maximum.

The case 122a of the driving module 122 includes a first fixing part 121a to which an upper end of the guide bar 124a is fixed and a second fixing part 121b to which a lower end of the guide bar 124a is fixed. And is vertically movable by a guide bar 124a. The upward movement of the case 122a is limited by the maximum compression of the elastic member 124b and the downward movement of the case 122a is limited by the case 122a being caught by the second fixing portion 121b .

The cleaner 100 physically detects the driving wheel 123 when the driving wheel 123 is not in contact with the bottom surface, and the rotation of the driving wheel 123 is controlled.

Specifically, a link member 125 is rotatably mounted on the wheel cover 121. [ In this figure, it is shown that the link member 125 is rotatably mounted on a mounting portion 121c connecting the first fixing portion 121a and the second fixing portion 121b.

The link member 125 includes a first link 125a and a second link 125b which are coupled to each other. The first link 125a is disposed on one side of the mounting portion 121c and the second link 125b is disposed on the other side of the mounting portion 121c.

The first and second links 125a and 125b are coupled to each other and rotate together. The coupling part is protruded from one of the first and second links 125a and 125b and the other one of the first and second links 125a and 125b has a coupling hole 125b ' May be formed.

It is preferable that the engaging hole 125b 'is non-circularly formed so as to prevent the engaging portion from being loosened when it is inserted. The engaging portion protrudes in a shape corresponding to the engaging hole 125b 'and is engaged with the engaging hole 125b'. The engaging portion 125b 'protrudes from the engaging hole 125b' And an elastic pin 125a "for preventing the elastic pin 125a "

The link member 125 is configured to be rotated in the opposite direction by an elastic member (not shown) to return to the home position when the pressurization is released, in a state in which the link member 125 is rotated under pressure.

A rotation guide 121e that defines a rotation range of the first link 125a may be formed on one surface of the mounting portion 121c to cover a part of the first link 125a. That is, the first link 125a is caught by the rotation guide 121e, and its rotation range can be limited.

The first link 125a is configured so that the case 122a of the driving module 122 is rotated in contact with the protrusion 122a1b formed in the case 122a when the case 122a moves downward by a predetermined distance. The protrusion 122a1b protrudes from the side of the case 122a of the drive module 122 and can be formed so as to be inclined so as to smoothly press the first link 125a.

As shown in Fig. 14, in a state in which the upper end of the case 122a is spaced apart from the second fixing portion 121b by a predetermined distance, the protrusion 122a1b and the first link 125a are placed apart from each other.

As the case 122a is gradually moved downward, the protrusion 122a1b and the first link 125a gradually come close to each other. When the protrusion 122a1b and the first link 125a are in contact with each other and the case 122a moves further downward, the protrusion 122a1b presses and rotates the first link 125a.

The rotation continues until the case 122a is engaged with the second fixing portion 121b as shown in Fig. As described above, the state in which the case 122a is engaged with the second fixing portion 121b is a state in which the driving wheel 123 loses grounding to the floor, that is, the driving wheel 123 does not touch the floor, 123) is in a downward position.

A switch 126 is provided on the other surface of the mounting portion 121c where the second link 125b is located, which is pressed by the rotation of the second link 125b. The switch 126 is mounted on the wheel cover 121 and can be electrically connected to the second connector 127.

The second link 125b connected to the first link 125a presses the switch 126 while the case 122a is engaged with the second fixing portion 121b, As shown in FIG.

When the switch 126 is pressed, the control unit can control the driving of the driving motor 122b.

For example, when the switch 126 is pressed, the control unit stops the driving of the driving motor 122b so that the driving wheel 123 is not rotated. The control may be performed when both the switches 126 provided on the left and right driving wheels 123 of the cleaner main body 110 are all pressed. This can be understood as a control for stopping the rotating driving wheel 123 when the cleaner main body 110 is lifted by the user.

When the switch 126 provided on one of the left and right drive wheels 123 of the cleaner main body 110 is pressed, the control unit drives the drive motor 122b in the opposite direction So that the driving wheel 123 is rotated in the opposite direction. This can be understood as a control for escaping the obstacle when the cleaner body 110 is caught by an obstacle and one driving wheel 123 is idle.

The protrusion of the drive module 122 rotates the link member 125 and the rotated link member 125 moves the switch 126 in a downward direction The rotation of the driving wheel 123 can be controlled (for example, stopped) when a situation occurs in which the driving wheel 123 does not touch the bottom surface due to the pressing mechanism. According to this, the stability can be improved and the user's satisfaction can be improved.

The detailed structure of the wheel assembly 120 has been described based on a structure in which the wheel assembly 120 is detachably coupled to the cleaner body 110. However, the drive module 122, the suspension 124, the link member 125, the switch 126, and the cliff sensor 129 may be mounted on the cleaner body 110 without forming one assembly.

In this case, the function of the wheel cover 121 described above can be replaced by the wheel house of the cleaner main body 110. [ The wheel house is formed to surround the upper portion of the driving wheel 123.

The wheel house may have first and second fixing portions 121a and 121b on which the guide bar 124a is mounted. The link member 125 can be rotatably mounted on the wheel house mounting portion 121c and the switch 126 can be mounted on the wheel house mounting portion 121c. The cliff sensor 129 may be disposed at the bottom of the wheel house or adjacent to the cleaner body 110.

In the above, the robot cleaner to which the present invention is applied has been described as an example. The robot cleaner is only intended to facilitate understanding of the application of the present invention, and should not be construed as limiting the present invention to the robot cleaner.

That is, the above-described structure can be applied to any structure having a driving wheel 123 rotated by a driving force in all the cleaners such as a canister type and an upright type.

Claims (15)

A cleaner main body having a control unit;
A wheel cover mounted on the cleaner main body;
A drive module movably coupled to the wheel cover up and down;
A drive wheel coupled to the drive module and configured to be rotatable by receiving a drive force from the drive module;
A guide bar coupled to the wheel cover and disposed vertically, the guide bar being formed to penetrate the drive module and guiding the up and down movement of the drive module;
An elastic member which is formed to surround the guide bar and connected to the wheel cover and the drive module to absorb an impact when the drive module is moved up and down;
A link member rotatably installed on the wheel cover and rotated by contacting the protrusion formed on the driving module when the driving module moves downward by a predetermined distance; And
And a switch that is pressed by the rotation of the link member and transmits a pressing signal to the control unit,
The wheel cover
A first fixing part to which an upper end of the guide bar is fixed; And
And a second fixing part formed to face the first fixing part and to which the lower end of the guide bar is fixed,
Wherein the drive module is vertically movable between the first fixing portion and the second fixing portion by the guide bar. The method according to claim 1,
The driving module includes:
A case having a through hole through which the guide bar passes and a projection;
A drive motor mounted on the case; And
And a planetary gear device that connects the drive motor and the drive wheel and transmits the rotation to the drive wheel by reducing the rotation of the drive motor. 3. The method of claim 2,
And the case is hooked to the second fixing part when the case is moved downward by a certain distance. 3. The method of claim 2,
Wherein the elastic member is connected to the first fixing part and the case, respectively. delete 3. The method of claim 2,
Wherein the control unit stops driving the drive motor when the switch is pressed. The method according to claim 1,
The link member
A first link that is exposed to one side of the wheel cover where the projection is located; And
And a second link coupled to the first link and exposed to the other side of the wheel cover on which the switch is located. 3. The method of claim 2,
Wherein the rotation axis of the driving motor and the rotation axis of the driving wheel are on the same axis. 3. The method of claim 2,
The planetary gear set includes:
A first planetary gear unit interlocked with a rotation axis of the driving motor; And
And a second planetary gear unit interlocked with the first planetary gear unit and connected to the driving wheel. 10. The method of claim 9,
In this case,
A main case having the through hole and to which the driving motor is mounted, the main case accommodating the first planetary gear unit;
A middle case coupled to the main case and disposed to cover the first planetary gear unit, the middle case receiving the second planetary gear unit; And
And a front case coupled to the middle case and disposed to cover the second planetary gear unit. 11. The method of claim 10,
The first planetary gear unit includes:
A first sun gear coupled to a rotation axis of the drive motor;
A first ring gear formed in the main case and accommodating a first sun gear therein;
A plurality of first planetary gears that engage with the first sun gear and the first ring gear and revolve in a direction opposite to the rotation direction of the first sun gear and revolve around the first sun gear in the same direction as the rotation direction of the first sun gear, Gear; And
And a first cage rotatably supporting a rotation axis of each of the plurality of first planetary gears. 12. The method of claim 11,
Wherein the second planetary gear unit comprises:
A second sun gear formed on the first cage;
A second ring gear formed in the middle case and accommodating a second sun gear therein;
And a plurality of second planetary gears engaged with the second sun gear and the second ring gear and revolving in a direction opposite to the rotation direction of the second sun gear and revolving about the second sun gear in the same direction as the rotation direction of the second sun gear, Gear; And
And a second cage rotatably supporting a rotation axis of each of the plurality of second planetary gears. 13. The method of claim 12,
And the second cage is formed with a coupling protrusion engaging with the coupling groove of the driving wheel to prevent the driving wheel from being loosened. The method according to claim 1,
A mounting portion is formed on a bottom portion of the cleaner body to be recessed toward the upper portion,
A first connector, which is electrically connected to the control unit, is disposed on an inner surface of the mounting portion facing the opening of the mounting portion so as to face the opening,
And a second connector electrically connected to the drive module and connected to the first connector when the wheel cover is housed in the mounting portion. The method according to claim 1,
And a receiving portion for receiving at least a part of the driving module is formed inside the driving wheel.

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