Home appliance and method of controlling same

Abstract

This home appliance comprises: a main body having an accommodation space; a door for opening and closing the accommodation space; and a door opening and closing device provided in the main body. The door opening and closing device comprises: a push unit including a push rod provided to push a door to open the door, and an opening gear train connected to the push rod to move the push rod; a link unit including a link configured to be connected to the door to close the door and a closing gear train configured to be connected to the link to move the link; a driving unit including a driving motor and a sun gear connected to the driving motor, wherein the driving motor is configured to generate a driving force for rotating the sun gear; and a clutch unit configured to be connected to the sun gear to rotate together with the sun gear, including a planetary gear movable between an open position connected to the opening gear train and a closed position connected to the closing gear train, and transmitting the driving force of the driving motor to the push unit on the basis of the planetary gear in the open position or transmitting the driving force of the driving motor to the link unit on the basis of the planetary gear in the closed position.

Description

Home appliances and their control methods

[0001] The present disclosure relates to a home appliance and a control method thereof, and more particularly, to a home appliance having a door opening / closing device for opening and closing a door and a control method thereof.

[0002] Home appliances are electronic devices primarily used in the home, including refrigerators, dishwashers, and ovens. These appliances include a main body with a storage space for handling items and a door for opening and closing the storage space.

[0003] Home appliances can be equipped with various convenience features to enhance user convenience. For example, a door opening / closing device can be provided that automatically opens or closes a door using driving force generated from a drive source.

[0004] One aspect of the present disclosure discloses a home appliance having a door opening / closing device capable of opening or closing a door through a single driving source.

[0005] One aspect of the present disclosure discloses a home appliance having a door opening / closing device capable of smoothly and efficiently performing opening and closing operations of a door.

[0006] One aspect of the present disclosure discloses a home appliance capable of automatically opening and closing a door through driving force generated from a driving source and manually opening and closing a door through user operation.

[0007] The technical problems to be achieved in this document are not limited to the technical problems mentioned above, and other technical problems not mentioned can be clearly understood by a person having ordinary skill in the technical field to which the present invention belongs from the description below.

[0008] According to one embodiment of the present disclosure, a home appliance includes a main body having an accommodation space; a door for opening and closing the accommodation space; and a door opening / closing device provided in the main body. The door opening / closing device includes a push portion including a push rod configured to push a door to open the door, and an opening gear train connected to the push rod for moving the push rod; a link portion including a link connected to the door and configured to close the door, and a closing gear train connected to the link and configured to move the link; a drive portion including a drive motor and a sun gear connected to the drive motor, the drive motor being configured to generate a driving force for rotating the sun gear; and a clutch portion including a planetary gear connected to the sun gear and configured to rotate together with the sun gear and movable between an open position connected to the open gear train and a closed position connected to the closed gear train, the clutch portion transmitting a driving force of the drive motor to the push portion based on the planetary gear in the open position or transmitting the driving force of the drive motor to the link portion based on the planetary gear in the closed position.

[0009] The above home appliance may further include an input interface for receiving an open command and a close command; and a control unit for controlling the drive motor to open the door based on the open command received through the input interface, and for controlling the drive motor to close the door based on the close command received through the input interface.

[0010] The control unit can drive the drive motor in a forward direction until it recognizes that the door is opened at a set angle based on the opening command received through the input interface, and can drive the drive motor in a reverse direction until it recognizes that the planetary gear has reached the neutral position based on the recognition that the door is opened at the set angle.

[0011] The control unit can drive the drive motor in the reverse direction until it recognizes that the door is closed based on receiving the closing command through the input interface, and can drive the drive motor in the forward direction until it recognizes that the planetary gear has reached the neutral position based on recognizing that the door is closed.

[0012] The above planetary gear can be configured to mesh with the above sun gear.

[0013] When the planetary gear is between the open position and the closed position, the planetary gear can be capable of revolving around the sun gear between the open position and the closed position in conjunction with the rotation of the sun gear.

[0014] When the planetary gear is in the open position, the planetary gear can rotate in conjunction with the rotation of the sun gear, and the open gear of the open gear train can rotate in conjunction with the rotation of the planetary gear, and when the planetary gear is in the closed position, the planetary gear can rotate in conjunction with the rotation of the sun gear, and the closed gear of the closed gear train can rotate in conjunction with the rotation of the planetary gear.

[0015] The above driving unit may include a sun gear pin provided to penetrate the center of the sun gear to guide rotation of the sun gear.

[0016] The clutch portion includes a carrier plate that is rotatable around the sun gear pin, and the planetary gear can be mounted on the carrier plate.

[0017] The clutch unit may include a friction member that generates frictional force between the planetary gear and the carrier plate so that the planetary gear revolves around the sun gear in conjunction with the rotation of the sun gear.

[0018] The clutch portion may include a planetary gear pin provided in the carrier plate so as to penetrate the center of the planetary gear to guide rotation of the planetary gear.

[0019] The above push rod can be linearly movable between a maximum forward position and a maximum backward position.

[0020] The above push portion may include an elastic member that elastically biases the push rod to the maximum rearward position.

[0021] The above home appliance may include a hinge that connects the main body and the door and supports the door so as to be rotatable relative to the main body; a cam coupled to the hinge and having a guide surface; and a lever device coupled to the door and having a lever that is arranged to contact the cam when the door is opened or closed.

[0022] The guide surface includes a first contact surface provided to apply force in a direction in which the lever closes the door when the lever is in contact, a second contact surface provided to transmit force in a direction in which the lever opens the door when the lever is in contact, and a bending point provided between the first contact surface and the second contact surface, and when the push rod is in the maximum forward position, the lever can pass the bending point and contact the second contact surface.

[0023] In another aspect, according to one embodiment of the present disclosure, a home appliance includes a main body having a receiving space; a door for opening and closing the receiving space; and a door opening / closing device provided on the main body for opening and closing the door; wherein the door opening / closing device includes a drive motor capable of rotating in a forward or reverse direction; a sun gear capable of rotating by a driving force of the drive motor; an opening gear train provided for opening the door; a closing gear train provided for closing the door; and a planetary gear meshed with the sun gear so as to transmit a driving force of the drive motor to the opening gear train or the closing gear train, wherein the planetary gear is provided to revolve or rotate depending on whether the planetary gear is connected to the opening gear train or the closing gear train.

[0024] When the above planetary gear is not connected to the above open gear train and the above closed gear train, the above planetary gear can revolve around the sun gear in conjunction with the rotation of the sun gear.

[0025] When the above planetary gear is connected to the above open gear train, the planetary gear can rotate in conjunction with the rotation of the sun gear, and the open gear of the above open gear train can rotate in conjunction with the rotation of the planetary gear.

[0026] When the above planetary gear is connected to the closed gear train, the planetary gear can rotate in conjunction with the rotation of the sun gear, and the closed gear of the closed gear train can rotate in conjunction with the rotation of the planetary gear.

[0027] The door opening / closing device may include a push rod that can move back and forth to open the door in conjunction with the rotation of the opening gear, and a movable link that can close the door in conjunction with the rotation of the closing gear.

[0028] According to one embodiment of the present disclosure, a door opening / closing device can open or close a door through one driving source.

[0029] According to one embodiment of the present disclosure, a door opening / closing device can perform a door opening operation and a door closing operation smoothly and efficiently.

[0030] According to one embodiment of the present disclosure, a door can be automatically opened and closed through driving force generated from a driving source, and the door can be manually opened and closed through a user's operation.

[0031] According to one embodiment of the present disclosure, noise generation can be reduced when a door is automatically closed through a door opening / closing device.

[0032] The effects that can be obtained from the present disclosure are not limited to the effects mentioned above, and other effects that are not mentioned can be clearly understood by a person having ordinary skill in the art to which the present disclosure belongs from the description below.

[0033] FIG. 1 is a drawing illustrating a refrigerator according to one embodiment of the present disclosure.

[0034] FIG. 2 is a drawing illustrating the upper surface of a refrigerator according to one embodiment of the present disclosure.

[0035] FIG. 3 is a drawing illustrating a door opening / closing device according to one embodiment of the present disclosure.

[0036] FIG. 4 is an exploded view of a part of a link portion of a door opening / closing device according to one embodiment of the present disclosure.

[0037] FIG. 5 is a plan view illustrating the internal structure of a door opening / closing device according to one embodiment of the present disclosure.

[0038] FIG. 6 is a perspective view illustrating the internal structure of a door opening / closing device according to one embodiment of the present disclosure.

[0039] Fig. 7 is a drawing showing the sun gear and clutch part separated from the door opening / closing device of Fig. 6.

[0040] FIG. 8 is a perspective view showing the bottom surface of a sun gear according to one embodiment of the present disclosure.

[0041] FIG. 9 is a perspective view illustrating an exploded view of a clutch unit according to one embodiment of the present disclosure.

[0042] FIG. 10 is a diagram illustrating a position sensor according to one embodiment of the present disclosure.

[0043] FIG. 11 is a cross-sectional view illustrating a sun gear and a clutch unit according to one embodiment of the present disclosure.

[0044] Fig. 12 is a drawing showing the push rod and elastic member separated from the door opening / closing device of Fig. 6.

[0045] FIG. 13 is a cross-sectional view illustrating a push rod and an elastic member according to one embodiment of the present disclosure.

[0046] FIG. 14 is a block diagram illustrating a control configuration of a refrigerator according to one embodiment of the present disclosure.

[0047] Figure 15 is a drawing showing the initial state of the door opening / closing device.

[0048] Figure 16 is a drawing showing a state in which the planetary gear moves to an open position by revolving the planetary gear in conjunction with the rotation of the sun gear.

[0049] Figure 17 is a drawing showing a state in which the push rod advances to the maximum forward position by rotating the planetary gear in conjunction with the rotation of the sun gear.

[0050] Fig. 18 is a drawing showing a state in which the push rod returns to the maximum backward position by the elastic force of the elastic member.

[0051] Figure 19 is a drawing showing a state in which the planetary gear moves to a closed position by revolving around the sun gear in conjunction with the rotation of the sun gear.

[0052] Figure 20 is a drawing showing a state in which the link is folded into a folded position by the planetary gear rotating in conjunction with the rotation of the sun gear.

[0053] Fig. 21 is a drawing showing the cam and lever device when the door of Figs. 15 and 16 is closed.

[0054] Fig. 22 is a drawing showing the cam and lever device when the push rod of Fig. 17 is advanced to the maximum forward position.

[0055] FIG. 23 is a diagram illustrating a control flow when an open command is received according to one embodiment of the present disclosure.

[0056] FIG. 24 is a diagram illustrating a control flow when an open command is received according to one embodiment of the present disclosure.

[0057] FIG. 25 is a diagram illustrating a control flow when an open command is received according to one embodiment of the present disclosure.

[0058] FIG. 26 is a diagram illustrating a control flow when a closure command is received according to one embodiment of the present disclosure.

[0059] FIG. 27 is a diagram illustrating a control flow when a closure command is received according to one embodiment of the present disclosure.

[0060] It should be understood that the various embodiments of the present disclosure and the terminology used therein are not intended to limit the technical features described in the present disclosure to specific embodiments, but rather to encompass various modifications, equivalents, or alternatives of the embodiments.

[0061] In connection with the description of the drawings, similar reference numerals may be used for similar or related components.

[0062] The singular form of a noun corresponding to an item may include one or more of said items, unless the relevant context clearly indicates otherwise.

[0063] In this disclosure, each of the phrases "A or B", "at least one of A and B", "at least one of A or B", "A, B, or C", "at least one of A, B, and C", and "at least one of A, B, or C" may include any one of the items listed together in the corresponding phrase, or all possible combinations thereof.

[0064] The term "and / or" includes any combination of a plurality of related described elements or any one of a plurality of related described elements.

[0065] Terms such as "first," "second," or "first" or "second" may be used simply to distinguish one component from another and do not qualify the components in any other respect (e.g., importance or order).

[0066] In addition, terms such as 'front', 'rear', 'top', 'bottom', 'side', 'left', 'right', 'upper', and 'lower' used in the present disclosure are defined based on the drawings, and the shape and position of each component are not limited by these terms.

[0067] Terms such as "include" or "have" are intended to specify the presence of a feature, number, step, operation, component, part or combination thereof described in the present disclosure, but do not preclude the presence or addition of one or more other features, numbers, steps, operations, components, parts or combinations thereof.

[0068] When a component is said to be “connected,” “coupled,” “supported,” or “in contact with” another component, this includes not only cases where the components are directly connected, coupled, supported, or in contact, but also cases where the components are indirectly connected, coupled, supported, or in contact through a third component.

[0069] When we say that a component is "on" another component, this includes not only cases where the component is in contact with the other component, but also cases where there is another component between the two components.

[0070] A refrigerator according to one embodiment may include a body.

[0071] The "body" may include an inner case, an outer case disposed on the outside of the inner case, and an insulating material provided between the inner case and the outer case.

[0072] The "inner case" may include at least one of a case, a plate, a panel, or a liner forming a storage compartment. The inner case may be formed as a single body, or may be formed by assembling a plurality of plates. The "outer case" may form the outer appearance of the main body, and may be joined to the outer side of the inner case so that insulation is placed between the inner case and the outer case.

[0073] "Insulation" can insulate the interior and exterior of a storage room so that the temperature inside the storage room can be maintained at a set temperature without being affected by the external environment. In one embodiment, the insulation can include foam insulation. The foam insulation can be formed by injecting and foaming urethane foam, a mixture of polyurethane and a foaming agent, between the inner and outer layers.

[0074] In one embodiment, the insulation may include a vacuum insulation material in addition to the foam insulation, or the insulation may consist solely of the vacuum insulation material instead of the foam insulation. The vacuum insulation material may include a core material and an outer shell material that accommodates the core material and seals the interior under a vacuum or near-vacuum pressure. However, the insulation material is not limited to the foam insulation or vacuum insulation material described above, and may include various materials that can be used for insulation.

[0075] A "storage room" may include a space defined by an interior wall. The storage room may further include an interior wall defining a corresponding space. The storage room may store various items, such as food, medicine, and cosmetics, and the storage room may be configured to be open on at least one side for the entry and exit of items.

[0076] A refrigerator may include one or more storage compartments. When a refrigerator includes two or more storage compartments, each compartment may have a different purpose and be maintained at different temperatures. To achieve this, each storage compartment may be separated from the others by a partition wall containing insulation.

[0077] The storage room may be designed to maintain an appropriate temperature range depending on its intended use, and may include a "refrigerator," a "freezer," or a "variable temperature room," which are distinguished by their intended use and / or temperature range. A refrigerator may be maintained at a temperature appropriate for refrigerating items, and a freezer may be maintained at a temperature appropriate for freezing items. "Refrigeration" may mean cooling items to a temperature that does not freeze them, and for example, a refrigerator may be maintained at a temperature ranging from 0 degrees Celsius to +7 degrees Celsius. "Freezing" may mean cooling items to freeze them or keep them frozen, and for example, a freezer may be maintained at a temperature ranging from -20 degrees Celsius to -1 degree Celsius. A variable temperature room may be used as either a refrigerator or a freezer, at the user's option or not.

[0078] In addition to names such as "refrigerator," "freezer," and "variable temperature room," a storage room may also be called by various other names such as "vegetable room," "fresh room," "cooling room," and "ice room." The terms "refrigerator," "freezer," and "variable temperature room" used hereinafter should be understood to encompass storage rooms having corresponding uses and temperature ranges.

[0079] In one embodiment, the refrigerator may include at least one door configured to open and close an open side of a storage compartment. The door may be configured to open and close one or more storage compartments, or a single door may be configured to open and close multiple storage compartments. The door may be installed on the front of the main body in a pivotal or sliding manner.

[0080] The "door" may be configured to seal the storage compartment when the door is closed. The door may include insulation, similar to the body, to insulate the storage compartment when the door is closed.

[0081] According to one embodiment, the door may include a door outer panel forming the front of the door, a door inner panel forming the back of the door and facing the storage compartment, an upper cap, a lower cap, and door insulation provided on the interior of these.

[0082] The door inner panel may be provided with a gasket that seals the storage compartment by contacting the front of the body when the door is closed. The door inner panel may include a dyke that protrudes rearward to accommodate a door basket for storing items.

[0083] In one embodiment, the door may include a door body and a front panel detachably coupled to the front side of the door body and forming the front of the door. The door body may include a door outer panel forming the front of the door body, a door inner panel forming the rear of the door body and facing the storage compartment, an upper cap, a lower cap, and door insulation provided inside these.

[0084] Depending on the arrangement of the door and storage compartment, refrigerators can be classified into French door type, side-by-side type, bottom mounted freezer (BMF), top mounted freezer (TMF), or single-door refrigerator.

[0085] According to one embodiment, the refrigerator may include a cold air supply device configured to supply cold air to the storage compartment.

[0086] A "cold air supply device" may include a system of machines, devices, electronic devices and / or combinations thereof that can generate cold air and guide the cold air to cool a storage room.

[0087] In one embodiment, the cold air supply device can generate cold air through a refrigeration cycle that includes the processes of compression, condensation, expansion, and evaporation of a refrigerant. To this end, the cold air supply device can include a refrigeration cycle device having a compressor, a condenser, an expansion device, and an evaporator capable of driving the refrigeration cycle. In one embodiment, the cold air supply device can include a semiconductor, such as a thermoelectric element. The thermoelectric element can cool a storage compartment by generating heat and cooling through the Peltier effect.

[0088] According to one embodiment, the refrigerator may include a machine room in which at least some components belonging to the cold air supply device are arranged.

[0089] The "machine room" may be designed to be partitioned and insulated from the storage room to prevent heat generated by components placed within the machine room from being transferred to the storage room. The interior of the machine room may be configured to be in communication with the exterior of the main body to dissipate heat from components placed within the machine room.

[0090] In one embodiment, the refrigerator may include a dispenser provided on the door to provide water and / or ice. The dispenser may be provided on the door so that it is accessible to a user without having to open the door.

[0091] In one embodiment, a refrigerator may include an ice-making device configured to produce ice. The ice-making device may include an ice-making tray configured to store water, an ice-separating device configured to separate ice from the ice-making tray, and an ice bucket configured to store ice produced in the ice-making tray.

[0092] According to one embodiment, the refrigerator may include a control unit for controlling the refrigerator.

[0093] The "control unit" may include a memory that stores or memorizes a program and / or data for controlling the refrigerator, and a processor that outputs a control signal for controlling a cold air supply device, etc. according to the program and / or data memorized in the memory.

[0094] Memory stores or records various information, data, commands, programs, etc. necessary for the operation of the refrigerator. Memory can store temporary data generated during the generation of control signals for controlling components within the refrigerator. Memory may include at least one of volatile memory and non-volatile memory, or a combination thereof.

[0095] The processor controls the overall operation of the refrigerator. The processor can control the components of the refrigerator by executing programs stored in memory. The processor may include a separate NPU that performs the operations of an artificial intelligence model. The processor may also include a central processing unit (CPU), a graphics processing unit (GPU), or the like. The processor may generate control signals to control the operation of the cooling system. For example, the processor may receive temperature information about the storage compartment from a temperature sensor and generate a cooling control signal to control the operation of the cooling system based on the temperature information.

[0096] Additionally, the processor may process user input of the user interface and control the operation of the user interface based on programs and / or data stored / stored in the memory. The user interface may be provided using an input interface and an output interface. The processor may receive user input from the user interface. Additionally, the processor may transmit display control signals and image data to the user interface for displaying an image on the user interface in response to the user input.

[0097] The processor and memory may be provided as a single unit or separately. The processor may include one or more processors. For example, the processor may include a main processor and at least one subprocessor. The memory may include one or more memories.

[0098] In one embodiment, a refrigerator may include a processor and memory that control all components within the refrigerator, and may include multiple processors and multiple memories that individually control the components within the refrigerator. For example, the refrigerator may include a processor and memory that control the operation of a cooling device based on the output of a temperature sensor. Additionally, the refrigerator may separately include a processor and memory that control the operation of a user interface based on user input.

[0099] The communication module can communicate with external devices, such as servers, mobile devices, and other home appliances, via a nearby access point (AP). The AP can connect the local area network (LAN) to which the refrigerator or user device is connected to the wide area network (WAN) to which the server is connected. The refrigerator or user device can then connect to the server via the WAN.

[0100] The input interface may include keys, a touchscreen, a microphone, etc. The input interface may receive user input and transmit it to the processor.

[0101] The output interface may include a display, a speaker, etc. The output interface may output various notifications, messages, information, etc. generated by the processor.

[0102] Hereinafter, refrigerators according to various embodiments will be specifically described with reference to the attached drawings.

[0103] FIG. 1 is a drawing illustrating a refrigerator according to one embodiment of the present disclosure. FIG. 2 is a drawing illustrating an upper surface of a refrigerator according to one embodiment of the present disclosure.

[0104] In FIGS. 1 and 2, the X direction, Y direction, and Z direction refer to the left-right direction, up-down direction, and front-back direction of the refrigerator (1), respectively.

[0105] A refrigerator (1) may include a main body (10), storage chambers (21, 22, 23) formed inside the main body (10), and doors (31, 32, 33, 34) provided to open and close the storage chambers (21, 22, 23).

[0106] The main body (10) may include an inner case (11), an outer case (12) coupled to the outer side of the inner case (11), and an insulating material provided between the inner case (11) and the outer case (12). The inner case (11) may form a storage chamber (21, 22, 23), and the outer case (12) may form the outer appearance of the main body (10).

[0107] The storage rooms (21, 22, 23) may be referred to as storage spaces. The storage rooms (21, 22, 23) can store items in a refrigerated or frozen state. The storage rooms (21, 22, 23) may be formed with an open front side so that items can be inserted or removed. The storage rooms (21, 22, 23) may be provided with shelves (24) for supporting items or containers (26) for accommodating items.

[0108] The main body (10) may include a horizontal partition wall (17) that divides the storage rooms (21, 22, 23) into an upper first storage room (21) and lower storage rooms (22, 23), and a vertical partition wall (18) that divides the lower storage rooms (22, 23) into a second storage room (22) and a third storage room (23). The first storage room (21) may be a refrigerator, the second storage room (22) may be a freezer, and the third storage room (23) may be a variable temperature room.

[0109] Doors (31, 32, 33, 34) can open and close storage rooms (21, 22, 23). The first door (31) and the second door (32) can open and close the first storage room (21), the third door (33) can open and close the second storage room (22), and the fourth door (34) can open and close the third storage room (23). The doors (31, 32, 33, 34) can be rotatably coupled to the main body (10).

[0110] The doors (31, 32, 33, 34) can be rotatably connected to the main body (10) by hinges (41, 42, 43). The first door (31) and the second door (32) can be rotatably connected to the main body (10) by an upper hinge (41) provided at the upper portion of the main body (10) and a middle hinge (42) provided at the middle portion of the main body (10), respectively. The third door (33) and the fourth door (34) can be rotatably connected to the main body (10) by an middle hinge (42) provided at the middle portion of the main body (10) and a lower hinge (43) provided at the lower portion of the main body (10).

[0111] The doors (31, 32, 33, 34) can rotate around the door rotation axis (35).

[0112] A rotating bar (50) may be provided on either the first door (31) or the second door (32) to cover the gap formed between the first door (31) and the second door (32) when the first door (31) and the second door (32) are closed. The rotating bar (50) may be provided to be rotatable on either the first door (31) or the second door (32).

[0113] Each of the doors (31, 32, 33, 34) may include a gasket (39). The gasket (39) may be provided on the back surface of each of the doors (31, 32, 33, 34). The gasket (39) may be brought into close contact with the front surface of the main body (10) when each of the doors (31, 32, 33, 34) is closed. Each of the doors (31, 32, 33, 34) may include a ditch protruding rearward. The ditch may be equipped with a door shelf (38) capable of storing items.

[0114] Although the number and arrangement of storage compartments and the number and arrangement of doors have been described above, there are no limitations on the number and arrangement of storage compartments and the number and arrangement of doors of a refrigerator according to one embodiment of the present disclosure. For example, the refrigerator may include multiple storage compartments arranged left and right, or may include only one storage compartment.

[0115] The refrigerator (1) may include a top cover (60) that is coupled to the front portion of the upper surface of the main body (10) to cover the upper hinge (41). The refrigerator (1) may include a door opening / closing device (100) that automatically opens and closes the door using a driving force generated from a driving source. The door opening / closing device (100) is coupled to the front portion of the upper surface of the main body (10) and may be covered by the top cover (60). Therefore, the door opening / closing device (100) may not be exposed to the outside.

[0116] The door opening / closing device (100) may be provided in multiple units. For example, the door opening / closing device (100) may include a first door opening / closing device (101) for opening / closing a first door (31) and a second door opening / closing device (102) for opening / closing a second door (32).

[0117] The door opening / closing device (100) may include a push rod (330, FIG. 5) that moves forward and backward to open the door. A through hole (70) may be formed on the front of the top cover (60) to allow the push rod (330) of the door opening / closing device (100) to pass through. A plurality of through holes (70) may be provided to correspond to the number of push rods (330).

[0118] The door opening device (100) may include a link (450) connected to the door to close the door.

[0119] The specific configuration of the door opening / closing device (100) is described below.

[0120] FIG. 3 is a drawing illustrating a door opening / closing device according to an embodiment of the present disclosure. FIG. 4 is an exploded view illustrating a portion of a link portion of a door opening / closing device according to an embodiment of the present disclosure. FIG. 5 is a plan view illustrating the internal structure of a door opening / closing device according to an embodiment of the present disclosure. FIG. 6 is a perspective view illustrating the internal structure of a door opening / closing device according to an embodiment of the present disclosure. FIG. 7 is a drawing illustrating the sun gear and the clutch unit in the door opening / closing device of FIG. 6, separated from each other. FIG. 8 is a perspective view illustrating the bottom surface of the sun gear according to an embodiment of the present disclosure. FIG. 9 is an exploded perspective view illustrating the clutch unit according to an embodiment of the present disclosure. FIG. 10 is a drawing illustrating a position sensor according to an embodiment of the present disclosure. FIG. 11 is a cross-sectional view illustrating the sun gear and the clutch unit according to an embodiment of the present disclosure. FIG. 12 is a drawing illustrating the push rod and the elastic member in the door opening / closing device of FIG. 6, separated from each other. FIG. 13 is a cross-sectional view illustrating a push rod and an elastic member according to one embodiment of the present disclosure.

[0121] Referring to FIGS. 3 to 13, a door opening / closing device (100) according to one embodiment of the present disclosure will be described. Since the configurations of the door opening / closing devices on the left and right sides of the drawings correspond to each other, the configuration of the door opening / closing device on the left side will be described, and a description of the configuration of the door opening / closing device on the right side will be omitted.

[0122] The door opening / closing device (100) is configured to automatically open or close the door (31) using driving force generated from a driving source.

[0123] The door opening / closing device (100) includes a housing (110, 140), a driving unit (200) that generates driving force, a push unit (300) for opening the door (31), a link unit (400) for closing the door (31), and a clutch unit (500) that transmits the power generated in the driving unit (200) to the push unit (300) or the link unit (400).

[0124] The housing (110, 140) may include an upper housing (110) and a lower housing (140) coupled to the lower portion of the upper housing (110). Various gears of the door opening / closing device (100) may be accommodated inside the housing (110, 140).

[0125] The driving unit (200) may include a driving motor (210) as a driving source. The driving motor (210) may convert electrical energy into mechanical rotational force. The driving motor (210) may be driven in both forward and reverse directions.

[0126] The driving unit (200) may include a driving gear train (220) for transmitting driving force generated from the driving motor (210). The driving gear train (220) may include at least one driving gear. For example, the driving gear train (220) may include a first driving gear (230) engaged with a motor shaft of the driving motor (210) and a second driving gear (240) engaged with the first driving gear (230).

[0127] The driving unit (200) may include a sun gear (250) connected to a driving motor (210) via a driving gear train (220). The sun gear (250) may rotate in one direction depending on the driving direction of the driving motor (210). For example, when the driving motor (210) is driven in a forward direction, the sun gear (250) may rotate in a first direction (S1, FIG. 16), and when the driving motor (210) is driven in a reverse direction, the sun gear (250) may rotate in a second direction (S2, FIG. 18) opposite to the first direction.

[0128] In this specification, the first direction is clockwise when viewed from above, and the second direction is counterclockwise when viewed from above, but is not limited thereto and may be opposite.

[0129] According to one embodiment of the present disclosure, the sun gear (250) may have the form of a two-stage spur gear in which two spur gears are coupled to one shaft. That is, the sun gear (250) may include an upper sun gear (251) and a lower sun gear (252) having a smaller radius than the upper sun gear (251). According to one embodiment of the present disclosure, the upper sun gear (251) may mesh with the second drive gear (240) and the lower sun gear (252) may mesh with the planetary gear (510).

[0130] The driving unit (200) may include a sun gear pin (290) provided to penetrate the center of the sun gear (250) to guide the rotation of the sun gear (250). That is, the sun gear pin (290) may form an axis of rotation of the sun gear (250). In addition, the sun gear pin (290) may form an axis of revolution of a planetary gear (510) described below.

[0131] The sun gear pin (290) can be supported by an axis support member (150, Fig. 11) formed in the lower housing (140). The sun gear pin (290) can be supported by being inserted into an axis support member (150) formed in the lower housing (140).

[0132] The sun gear (250) may include an axial hole (260) formed in the center of the sun gear (250) so that a sun gear pin (290) is inserted.

[0133] The push unit (300) may include a push rod (330) configured to push the door (31) to open the door (31), and an opening gear train (310) connected to the push rod (330) to move the push rod (330).

[0134] The push rod (330) can be accommodated in a push rod receiving portion (160) provided in the housing (110, 140). The push rod receiving portion (160) can be provided in a sunken form in the upper housing (110) or the lower housing (140).

[0135] The push rod (330) may have a rod shape. A pressing portion (340) may be provided at one end of the longitudinal direction of the push rod (330) to contact the door (31) and pressurize the door (31). The pressing portion (340) may include a roller to alleviate impact and friction generated when pressing the door (31).

[0136] A straight rack gear portion (350) that meshes with an open gear (320) of an open gear train (310) may be provided on one longitudinal side of the push rod (330). When the open gear (320) rotates, the rack gear portion (350) can move in a straight direction. Accordingly, the push rod (330) can move forward toward the door (31) or backward in the opposite direction, depending on the rotational direction of the open gear (320).

[0137] The open gear train (310) may include at least one open gear. According to one embodiment of the present disclosure, the open gear train (310) may be composed of only one open gear (320). However, this is not limited to the open gear train, and the open gear train (310) may also be composed of a plurality of open gears.

[0138] The push rod (330) can move linearly between a maximum forward position and a maximum backward position. Hereinafter, reference numeral 330(F) may refer to a push rod in a maximum forward position or a maximum forward position. Additionally, reference numeral 330(B) may refer to a push rod in a maximum backward position or a maximum backward position.

[0139] As illustrated in FIG. 12, the push unit (300) may include an elastic member (370) that elastically biases the push rod (330) to the maximum rearward position (330(B)).

[0140] The elastic member (370) may include a tension spring. One end (371) of the elastic member may be fixed to the housing (110, 140). An elastic member fixing portion (170) to which one end (371) of the elastic member is fixed may be formed in the upper housing (110) or the lower housing (140). The other end (372) of the elastic member may be fixed to the push rod (330). For this purpose, an elastic member fixing portion (360) to which the other end (372) of the elastic member is fixed may be provided in the push rod (330).

[0141] The link unit (400) may include a link (450) connected to the door (31) to close the door (31), and a closing gear train (410) connected to the link (450) to move the link (450).

[0142] A link (450) may include a plurality of link bars connected to each other. For example, the link (450) may include a first link bar (460) and a second link bar (470) connected to the first link bar (460).

[0143] Specifically, one end of the first link bar (460) may be coupled to the door (31), and one end of the second link bar (470) may be coupled to one closing gear (440) of the closing gear train (410). The other end of the first link bar (460) and the other end of the second link bar (470) may be rotatably coupled to each other.

[0144] The first link bar (460) may include a door engaging portion (461) formed at one end of the first link bar (460). The door engaging portion (461) may have a hole shape, and the door (31) may be provided with an engaging protrusion that is inserted into and engaged with the door engaging portion (461).

[0145] The second link rod (470) may include a gear coupling portion (471) formed at one end of the second link rod (470) to be coupled to the closed gear (440). The gear coupling portion (471) may have a disc shape. The central portion of the gear coupling portion (471) may be opened for coupling of a disengagement prevention cap (491) described later. The gear coupling portion (471) may be coupled to the closed gear (440) through a fastening member (SC1) such as a screw, a nail, a rivet, a pin, or the like. With this structure, the closed gear (440) and the second link rod (470) may rotate together.

[0146] Specifically, when the closed gear (440) rotates around the rotational axis of the closed gear (440), the second link rod (470) can also rotate around the rotational axis of the closed gear (440). Conversely, when the second link rod (470) rotates around the rotational axis of the closed gear (440), the closed gear (440) can also rotate around the rotational axis of the closed gear (440).

[0147] The gear coupling portion (471) may be coupled to the upper side of the closed gear (440). An opening (120) may be formed in the upper housing (110) for coupling the gear coupling portion (471) and the closed gear (440). An opening cover (490) for covering the opening (120) may be coupled between the gear coupling portion (471) and the closed gear (440). A separation prevention cap (491) may be provided on the upper side of the gear coupling portion (471) to prevent the second link rod (470) from being detached. The separation prevention cap (491) may be coupled to the lower housing (140) by a fastening member (SC2).

[0148] The link (450) may include a connecting pin (480) that rotatably connects the first link rod (460) and the second link rod (470). The connecting pin (480) may pass through a connecting hole formed in the other end of the first link rod (460) and a connecting hole formed in the other end of the second link rod (470). A washer (481) may be interposed between the other end of the first link rod (460) and the other end of the second link rod (470). The washer (481) may prevent friction and wear by preventing direct contact between the other end of the first link rod (460) and the other end of the second link rod (470). A separation prevention disk (482) may be coupled to the upper end of the connecting pin (480) to prevent separation of the first link rod (460) and the second link rod (470).

[0149] The link (450) can move between a folded position and a fully expanded position. Hereinafter, reference numeral 450(F) may refer to a link in a folded position or a folded position. In addition, reference numeral 450(E) may refer to a link in a fully expanded position or a fully expanded position. In addition, reference numeral 450(P) may refer to a link in a partially expanded position or a partially expanded position.

[0150] As illustrated in FIG. 15, when the door (31) is closed, the link (450) may be in a folded position (450(F)). When the link (450) is in the folded position (450(F)), the straight-line distance (L1) between the door engaging portion (461) of the first link bar (460) and the gear engaging portion (471) of the second link bar (470) may be minimized.

[0151] As illustrated in Fig. 17, when the door (31) is partially open, the link (450) may be in a partially unfolded position (450(P)). When the link (450) is in a partially unfolded position (450(P)), the straight-line distance (L2) between the door engaging portion (461) of the first link bar (460) and the gear engaging portion (471) of the second link bar (470) may be an intermediate distance between the minimum distance and the maximum distance.

[0152] As illustrated in FIG. 18, when the door (31) is in the maximum open state, the link (450) can be in the maximum unfolded position (450(E)). When the link (450) is in the maximum unfolded position (450(E)), the straight-line distance (L3) between the door engaging portion (461) of the first link bar (460) and the gear engaging portion (471) of the second link bar (470) can be at a maximum.

[0153] The closed gear train (410) may include at least one closed gear. For example, the closed gear train (410) may include a first closed gear (420) that can mesh with the planetary gear (510), a second closed gear (430) that meshes with the first closed gear (420), and a third closed gear (440) that meshes with the second closed gear (430). The first link rod (470) described above may be coupled to the third closed gear (440).

[0154] The clutch unit (500) can transmit the driving force generated from the driving motor (210) to the push unit (300) or the link unit (400). To this end, the clutch unit (500) can include a planetary gear (510) that can move between an open position connected to an open gear train (310) and a closed position connected to a closed gear train (410).

[0155] Hereinafter, reference numeral 510(O) may refer to a planetary gear (510) in an open position or an open position. In addition, reference numeral 510(C) may refer to a planetary gear (510) in a closed position or a closed position. In addition, reference numeral 510(N) may refer to a planetary gear in a neutral position between the open position and the closed position or a neutral position.

[0156] The planetary gear (510) can be arranged to mesh with the sun gear (250) regardless of its position. Accordingly, when the planetary gear (510) is in the open position (510(O)), the driving force of the drive motor (210) can be transmitted to the open gear train (310) via the sun gear (250) and the planetary gear (510), and when the planetary gear (510) is in the closed position (510(C)), the driving force of the drive motor (210) can be transmitted to the closed gear train (410) via the sun gear (250) and the planetary gear (510).

[0157] As illustrated in FIG. 15, when the sun gear (250) rotates while the planetary gear (510) is in a neutral position (510(N)) between the open position (510(O)) and the closed position (510(C)), the planetary gear (510) can revolve around the sun gear (250) in conjunction with the rotation of the sun gear (250).

[0158] In this specification, the term "revolution" refers to the rotation of the planetary gear (510) around another component (e.g., a sun gear), and the term "rotation on its axis" refers to the rotation of the planetary gear (510) around its central axis, the planetary gear pin (540). In addition, the term "rotation" is the same as the term "rotation." However, in this specification, the planetary gear (510) performs both revolution and rotation, so in order to distinguish them, the terms revolution and rotation are used for the planetary gear (510), and the term rotation is used for the remaining components.

[0159] As illustrated in FIG. 17, when the sun gear (250) rotates while the planetary gear (510) is in the open position (510(O)), the planetary gear (510) can rotate in conjunction with the rotation of the sun gear (250). At least one open gear (320) can rotate in conjunction with the rotation of the planetary gear (510). The push rod (330) can move linearly in conjunction with the rotation of at least one open gear (320).

[0160] That is, when the planetary gear (510) is in the open position (510(O)), the planetary gear (510) transmits the rotational force of the sun gear (250) to at least one open gear (320), and the push rod (330) can move linearly through the rotational force transmitted to at least one open gear (320).

[0161] As illustrated in FIG. 20, when the sun gear (250) rotates while the planetary gear (510) is in the closed position (510(C)), the planetary gear (510) can rotate in conjunction with the rotation of the sun gear (250). At least one closed gear (420, 430, 440) can rotate in conjunction with the rotation of the planetary gear (510). The link (450) can move in conjunction with the rotation of at least one closed gear (420, 430, 440).

[0162] That is, when the planetary gear (510) is in the closed position (510(C)), the planetary gear (510) transmits the rotational force of the sun gear (250) to at least one closed gear (420, 430, 440), and the link (450) can move by the rotational force transmitted to at least one closed gear (420, 430, 440).

[0163] In this way, the planetary gear (510) can operate differently depending on the position of the planetary gear (510).

[0164] When the planetary gear (510) is in the neutral position (510(N)), i.e., when the planetary gear (510) is not connected to the open gear train (310) or the closed gear train (410), the planetary gear (510) can revolve around the sun gear (250) in conjunction with the rotation of the sun gear (250).

[0165] When the planetary gear (510) is in the open position (510(O)) or the closed position (510(C)), i.e., when the planetary gear (510) is connected to the open gear train (310) or the closed gear train (410), the planetary gear (510) can rotate in conjunction with the rotation of the sun gear (250).

[0166] As illustrated in FIG. 9, the clutch unit (500) is configured to be rotatable around the sun gear pin (290) so that the above operation of the planetary gear (510) is performed, and may include a carrier plate (520) on which the planetary gear (510) is mounted, and a friction member (530) that generates frictional force between the planetary gear (510) and the carrier plate (520) so that the planetary gear (510) revolves around the sun gear (250) in conjunction with the rotation of the sun gear (250).

[0167] The clutch unit (500) may include a planetary gear pin (540) provided on the carrier plate (520) so as to penetrate the center of the planetary gear (510) to guide the rotation of the planetary gear (510). The planetary gear pin (540) may form an axis of rotation of the planetary gear (510). The planetary gear pin (540) and the sun gear pin (290) are provided spaced apart from each other and parallel to each other.

[0168] An axial hole (515) into which a planetary gear pin (540) is inserted may be formed at the center of the planetary gear (510). The planetary gear pin (540) may include a fixed slot (541) formed in the planetary gear pin (540) to accommodate a fixed ring (550) for fixing the planetary gear (540) to the planetary gear pin (540).

[0169] The planetary gear pin (540) may be arranged perpendicular to the upper surface of the carrier plate (520). The carrier plate (520) may include a pin receiving portion (522) formed on the upper surface of the carrier plate (520) so that the planetary gear pin (540) is inserted and fixed.

[0170] The carrier plate (520) may include an axial hole (525) into which an axial support member (150) of the lower housing (140) is inserted. The carrier plate (520) may rotate around the axial support member (150) inserted into the axial hole (525).

[0171] A friction member (530) may be placed between the planetary gear (510) and the carrier plate (520). The friction member (530) may provide frictional force between the planetary gear (510) and the carrier plate (520) so that the planetary gear (510) does not rotate but revolves when the sun gear (250) rotates.

[0172] Since the carrier plate (520) is configured to rotate around the sun gear pin (290), in the process of the carrier plate (520) rotating around the sun gear pin (290), the planetary gear (510) mounted on the carrier plate (520) also revolves around the sun gear pin (290). That is, the revolve of the planetary gear (510) can be guided by the carrier plate (520).

[0173] A compression spring may be used as the friction member (530). One end (531) of the friction member (530) may be supported on the lower surface of the planetary gear (510), and the other end (532) of the friction member (530) may be supported on the upper surface of the carrier plate (520). However, the friction member (530) is not limited to a compression spring, and may be anything other than a compression spring as long as it can provide frictional force between the planetary gear (510) and the carrier plate (520).

[0174] Due to this structure, when the planetary gear (510) is positioned between the open position (510(O)) and the closed position (510(C)), the planetary gear (510) can revolve in conjunction with the rotation of the sun gear (250).

[0175] In contrast, when the planetary gear (510) is in the open position (510(0)), the planetary gear (510) meshes with the open gear (320) whose shaft is fixed. Therefore, at this time, the revolution of the planetary gear (510) is limited, and the planetary gear (510) can rotate in conjunction with the rotation of the sun gear (250).

[0176] When the planetary gear (510) is in the closed position (510(O)), the planetary gear (510) meshes with the closed gear (440) whose shaft is fixed. Therefore, at this time, the revolution of the planetary gear (510) is limited, and the planetary gear (510) can rotate in conjunction with the rotation of the sun gear (250).

[0177] Referring to FIG. 10, the refrigerator (1) may include a position sensor (840, 850) configured to detect the position of the planetary gear (510). The position sensor (840, 850) may include a Hall sensor that detects a magnetic field and generates an electric signal. The Hall sensor may include a Hall element formed of a semiconductor. The position sensor (840, 850) may be provided on a printed circuit board (830) that supplies current to the position sensor (840, 850) and processes the generated signal. The position sensor (840, 850) may detect the position of the planetary gear (510) without directly contacting the planetary gear (510) in a non-contact manner.

[0178] A magnet (590) may be provided in the magnet mounting portion (591) of the carrier plate (520). As the carrier plate (520) moves, the magnet (590) moves along with it, and the resulting change in the magnetic field can be detected by the position sensor (840, 850).

[0179] The position sensor (840, 850) may be a digital Hall sensor that uses a comparator to turn a signal on or off. That is, the position sensor (840, 850) may output High when a magnetic field greater than a certain threshold is detected, and output Low otherwise.

[0180] The position sensors (840, 850) may include an open position sensor (840) that detects whether the planetary gear (510) is in an open position (510(O)), and a closed position sensor (850) that detects whether the planetary gear (510) is in a closed position (510(C)).

[0181] The position sensors (840, 850) can recognize that the planetary gear (510) is in the neutral position (510(N)) when both the open position sensor (840) and the closed position sensor (850) output off.

[0182] However, unlike the present embodiment, there is no limitation on the number of position sensors. For example, an additional position sensor capable of directly detecting the neutral position (510(N)) of the planetary gear (510) may be provided.

[0183] FIG. 14 is a block diagram illustrating a control configuration of a refrigerator according to one embodiment of the present disclosure.

[0184] Referring to FIG. 14, the refrigerator (1) may include a user interface (600) that receives user input and outputs information related to the operation of the refrigerator. The user interface (600) may be provided on the door.

[0185] The user interface (600) may include an input interface (610) for receiving user input and an output interface (620) for outputting information related to the operation of the refrigerator.

[0186] The input interface (610) can receive user input and transmit it to the control unit (700). The input interface (610) can receive the target temperature of the storage compartment and the storage mode of the storage compartment. Here, the storage mode can include a freezing mode, a refrigeration mode, a kimchi mode, a vegetable mode, etc. The input interface (610) can receive a door opening command.

[0187] The input interface (610) may include hardware devices such as keys, buttons, switches, pedals, a mouse, a trackball, a microphone, etc. The input interface (610) may include a GUI (Graphical User Interface), i.e. a software device, such as a touch pad. The touch pad may be implemented as a touch screen panel (TSP) and may form a mutual layer structure with the display unit.

[0188] The output interface (620) can output guidance information for automatic door opening or automatic door closing. The output interface (620) can include a display unit and a speaker.

[0189] The display unit may display information related to the status or operation of the refrigerator (1) based on the control command of the control unit (700), and may display information to guide user input. The display unit may display information entered into the input interface (610). The display unit may display the target temperature and storage mode of the storage compartment. The display unit may display the open and closed states of the door.

[0190] The display unit may include a plurality of seven-segment displays. The display unit may be formed of, but is not limited to, a liquid crystal display (LCD), a digital light processing (DLP) panel, a plasma display panel, an electroluminescence (EL) panel, an electrophoretic display (EPD) panel, an electrochromic display (ECD) panel, a light emitting diode (LED) panel, or an organic light emitting diode (OLED) panel.

[0191] The speaker can output information related to the status or operation of the refrigerator (1) as a guide sound based on the control command of the control unit (700), and can output information for guiding the user's input as a guide sound. The speaker can output a guide sound corresponding to a change in the target temperature of the storage compartment, or a guide sound corresponding to a change in the storage mode of the storage compartment. The speaker can output a guide sound for automatic door opening or automatic door closing.

[0192] The refrigerator (1) may include an angle sensor (810) that detects the opening angle of the door. The angle sensor (810) may detect the opening angle of the door and transmit information about the detected opening angle of the door to the control unit (700). The opening angle of the door in the closed state may be 0 degrees.

[0193] The angle sensor (810) can detect the door opening angle in various ways. For example, the angle sensor (810) can detect the door opening angle by detecting the rotation angle of the third closing gear (440). The angle sensor (810) can be provided as a light sensor or a hall sensor, etc.

[0194] A refrigerator (1) may include an open / close sensor (820) that detects the position of a door and outputs door position information corresponding to the detected door position. Here, the door position may include an open position and a closed position.

[0195] The open / close sensor (820) may include a micro switch, a limit switch, a magnetic switch, a reed switch, a toggle switch, a tact switch, etc. The open / close sensor (820) may include, but is not limited to, a light sensor, an ultrasonic sensor, or an impact sensor.

[0196] The door opening device (100) may include a push rod sensor (860) that detects the position of the push rod (330).

[0197] The control unit (700) can be electrically connected to various components of the refrigerator and can control the various components. That is, the control unit (700) can control the overall operation of the refrigerator (1). The control unit can include a memory (720) that stores or memorizes a program and / or data for controlling the refrigerator, and a processor (710) that outputs a control signal for controlling the cold air supply device and the drive motor (210) according to the program and / or data memorized in the memory.

[0198] The control unit (700) can control the operation of the refrigerator (1) based on user input received at the input interface (610). The control unit (700) can control the output interface (620) so that output information related to the operation of the refrigerator (1) is output.

[0199] The control unit (700) can receive the target temperature of the storage room from the input interface (610) and control the output interface (620) to display the received target temperature of the storage room. The control unit (700) can control the operation of the cooling system based on the target temperature of the storage room and the temperature detected by a temperature sensor (not shown) of the storage room.

[0200] Hereinafter, with reference to the drawings, the operation of a door opening / closing device according to one embodiment of the present disclosure and the opening / closing operation of the door according to the same will be described.

[0201] Fig. 15 shows a door (31) in a closed state and a door opening / closing device (100) in an initial state.

[0202] When the door opening / closing device (100) is in its initial state, the planetary gear (510) may be in the neutral position (510(N)).

[0203] When the door opening / closing device (100) is in its initial state, the push rod (330) may be in the maximum backward position (330(B)). The push rod (330) may be elastically biased to the maximum backward position (330(B)) by an elastic member (370).

[0204] When the door opening / closing device (100) is in the initial state, the link (450) may be in the folded position (450(F)). When the link (450) is in the folded position (450(F)), the straight-line distance (L1) between the door engaging portion (461) of the first link bar (460) and the gear engaging portion (471) of the second link bar (470) may be minimum.

[0205] Figure 16 is a drawing showing a state in which the planetary gear moves to an open position by revolving the planetary gear in conjunction with the rotation of the sun gear.

[0206] When a door opening command is received from a user through the input interface (610), the control unit (700) can control the door opening / closing device (100). Based on the door opening command being received through the input interface (610), the control unit (700) can control the drive motor (210) so that the motor shaft of the drive motor (210) rotates in the forward direction.

[0207] The forward driving force of the drive motor (210) can be transmitted to the sun gear (250) through the drive gear train (220). For example, when the drive motor (210) is driven in the forward direction, the sun gear (250) can rotate in the first direction (S1).

[0208] The planetary gear (510) can revolve around the sun gear (250) in a first rotation direction (REV1) in conjunction with the rotation of the sun gear (250) in the first direction (S1). Here, the first direction (S1) and the first rotation direction (REV1) are the same direction.

[0209] The planetary gear (510) can rotate in the first rotation direction (REV1) until it engages the open gear (320). Once the planetary gear (510) begins to engage the open gear (320), the rotation of the planetary gear (510) can be limited by the resistance of the open gear (320).

[0210] Figure 17 is a drawing showing a state in which the push rod advances to the maximum forward position by rotating the planetary gear in conjunction with the rotation of the sun gear.

[0211] When the sun gear (250) rotates in the first direction (S1) while the planetary gear (510) is engaged with the open gear (320), the planetary gear (510) can rotate in the second rotation direction (R2). Here, the second rotation direction (R2) is the opposite direction to the first direction (S1).

[0212] The open gear (320) can rotate in the first direction (O1) in conjunction with the rotation of the planetary gear (510) in the second rotation direction (R2). Here, the first direction (O1) is the opposite direction to the second rotation direction (R2).

[0213] In conjunction with the rotation of the opening gear (320) in the first direction (O1), the push rod (330) can move linearly forward (F) to the maximum forward position (330(F)). As the push rod (330) moves forward, the push rod (330) presses the door (31) so that the door (31) can be opened.

[0214] As illustrated in FIG. 17, when the forward drive of the drive motor (210) is stopped, the planetary gear (510) is in the open position (510(O)), the push rod (330) is in the maximum forward position (330(F)), and the link (450) is in the partially extended position (450(P)).

[0215] When the link (450) is in a partially unfolded position (450(P)), the straight-line distance (L2) between the door engaging portion (461) of the first link bar (460) and the gear engaging portion (471) of the second link bar (470) can be a distance between the minimum straight-line distance (L1) and the maximum straight-line distance (L3).

[0216] At this time, the elastic member (370) is stretched to the maximum, so that elastic force can be accumulated to the maximum in the elastic member (370).

[0217] Fig. 18 is a drawing showing a state in which the push rod returns to the maximum backward position by the elastic force of the elastic member.

[0218] When the forward driving of the drive motor (210) is stopped, the push rod (330) can move linearly backward (B) to the maximum backward position (330(B)) by the elastic force of the elastic member (370).

[0219] Since the rack gear portion (350) of the push rod (330) is engaged with the open gear (320), the open gear (320) can rotate in the second direction (O2) in conjunction with the rearward movement of the push rod (330).

[0220] The planetary gear (510) can rotate in the first rotation direction (R1) in conjunction with the rotation of the open gear (320) in the second direction (O2), and the sun gear (250) can rotate in the second direction (S2) in conjunction with the rotation of the planetary gear (510) in the first rotation direction (R1). The rotational power of the sun gear (250) can be transmitted to the drive gear train (220) and the drive motor (210).

[0221] In this way, the push rod (330) can be restored backward (B) by the elastic force of the elastic member (370) while being engaged with the open gear (320). Therefore, during the process of restoring the push rod (330) backward, the open gear (320), the planetary gear (510), the sun gear (250), the drive gear train, the drive motor (210), etc. can act as loads.

[0222] Accordingly, the speed of the return operation of the push rod (330) can be reduced, and noise generated due to the rapid return and collision of the push rod (330) can be reduced. In addition, the return operation of the push rod (330) can be performed smoothly.

[0223] Simultaneously with the return motion of the push rod (330), the door (31) can be opened to a larger opening angle by inertia or a separate cam structure (see FIGS. 21 and 22). That is, the door (31) can be opened to the maximum opening angle.

[0224] As the door (31) opens to the maximum opening angle, the link (450) may be further expanded. That is, as the door (31) opens to the maximum opening angle, the link (450) may reach the maximum expanded position (450(E)).

[0225] When the link (450) is in the maximum extended position (450(E)), the straight-line distance (L3) between the door engaging portion (461) of the first link bar (460) and the gear engaging portion (471) of the second link bar (470) can be maximized.

[0226] Figure 19 is a drawing showing a state in which the planetary gear moves to a closed position by revolving around the sun gear in conjunction with the rotation of the sun gear.

[0227] When a door closing command is received from a user through the input interface (610), the control unit (700) can control the door opening / closing device (100). Based on the door closing command being received through the input interface (610), the control unit (700) can control the drive motor (210) so that the motor shaft of the drive motor (210) rotates in the reverse direction, which is opposite to the forward direction.

[0228] The forward driving force of the drive motor (210) can be transmitted to the sun gear (250) through the drive gear train (220). For example, when the drive motor (210) is driven in the reverse direction, the sun gear (250) can rotate in the second direction (S2).

[0229] In conjunction with the rotation of the sun gear (250) in the second direction (S2), the planetary gear (510) can revolve around the sun gear (250) in the second revolution direction (REV1). Here, the second direction (S2) and the second revolution direction (REV1) are the same direction.

[0230] The planetary gear (510) can rotate in the second rotation direction (REV2) until it engages the closed gear (420). Once the planetary gear (510) begins to engage the closed gear (420), the rotation of the planetary gear (510) can be limited by the resistance of the closed gear (420).

[0231] As shown in FIG. 19, when the planetary gear (510) begins to mesh with the closed gear (420) of the closed gear train, the planetary gear (510) is in the closed position (510(C)), the push rod (330) is in the maximum backward position (330(B)), and the link (450) is in the maximum extended position (450(E)).

[0232] Figure 20 is a drawing showing a state in which the link is folded into a folded position by the planetary gear rotating in conjunction with the rotation of the sun gear.

[0233] When the sun gear (250) rotates in the second direction (S2) while the planetary gear (510) is engaged with the closed gear (420), the planetary gear (510) can rotate in the first rotation direction (R1). Here, the first rotation direction (R1) is the opposite direction to the second direction (S2).

[0234] The closed gear (420) can rotate in a second direction (C2) in conjunction with the rotation of the planetary gear (510) in the first rotation direction (R1). Here, the second direction (C2) is the opposite direction to the first rotation direction (R1).

[0235] The closed gear (430) and the closed gear (440) can rotate in conjunction with the rotation of the closed gear (420), and the second link rod (470) of the link (450) can rotate in conjunction with the rotation of the closed gear (440).

[0236] As the second link bar (470) rotates, the link (450) moves to the folded position (450(F)), and as the link (450) moves to the folded position (450(F)), the door (31) connected to the link (450) can be closed.

[0237] Fig. 21 is a drawing showing the cam and lever device when the door of Figs. 15 and 16 is in a closed state. Fig. 22 is a drawing showing the cam and lever device when the push rod of Fig. 17 is advanced to the maximum forward position.

[0238] Referring to FIGS. 21 and 22, an operation in which the door (31) is opened to a larger opening angle by the cam structure after the push rod (330) has advanced to the maximum forward position is described.

[0239] The refrigerator (1) may include a cam (870) coupled to a hinge (41) and a lever device (890) coupled to a door.

[0240] The cam (870) may be coupled to the bottom surface of the hinge (41). The cam (870) may include a guide surface (880). The guide surface (880) may form a portion of the outer surface of the cam (870).

[0241] The guide surface (880) may include a first contact surface (881) provided to apply force in a direction in which the lever (895) closes the door (31) when the lever (895) to be described later is in contact with it, a second contact surface (882) provided to transmit force in a direction in which the lever (895) opens the door (31) when the lever (895) is in contact with it, and a curved point (883) provided between the first contact surface (881) and the second contact surface (882).

[0242] The first contact surface (881) and the second contact surface (882) can be connected to each other based on the curved point (883). When the door is opened, the lever (895) in contact with the cam (870) can move sequentially through the first contact surface (881), the curved point (883), and the second contact surface (882).

[0243] The lever device (890) can be coupled to the upper part of the door (31).

[0244] The lever device (890) may include a lever (895) arranged to contact the cam (870) when the door (31) is opened or closed, and an elastic member (899) connected to the lever (895) and arranged to be compressed or extended when the lever (895) moves relative to the door (31).

[0245] The lever (895) may be arranged to be rotatable about a lever rotation axis (896). The lever (895) may include a roller (897) arranged to contact a cam (870).

[0246] The elastic member (899) is designed to accumulate elastic force to the maximum when the lever (895) comes into contact with the bending point (883), is designed to be compressed by the lever (895) when the lever (895) comes into contact with the first contact surface (881) and moves toward the bending point (883), and can apply elastic force in the direction of opening the door (31) when the lever (895) comes into contact with the second contact surface (882) and moves away from the bending point (883).

[0247] The lever device (890) may include a first support protrusion (891) on which one end of the elastic member (899) is supported, and a second support protrusion (892) on which the other end of the elastic member (899) is supported.

[0248] When the push rod (330) is advanced to the maximum forward position, the lever (895) can pass the bending point (883) and contact the second contact surface (882). That is, the push rod (330) can advance until the lever (895) passes the bending point (883) and contacts the second contact surface (882).

[0249] With this configuration, even after the push rod (330) has advanced to the maximum forward position, the door (31) can continue to be opened by elastic force or inertia and can be opened to the maximum opening angle.

[0250] Below, a specific control method is described when an open command and a close command are received with reference to the drawings.

[0251] FIG. 23 is a diagram illustrating a control flow when an open command is received according to one embodiment of the present disclosure.

[0252] A door opening command can be received (910) from the input interface (610).

[0253] The control unit (700) can drive the drive motor (210) in the forward direction until it recognizes that the door is opened at a set angle based on a door opening command received through the input interface (610) (911, 912).

[0254] Specifically, the control unit (700) can recognize that the door is opened to a set angle based on the door opening angle detected by the angle sensor (810) reaching the set angle.

[0255] Alternatively, the control unit (700) may recognize that the door is opened to a set angle based on the driving motor FG count value reaching the set FG count value after the forward driving of the driving motor (210) begins.

[0256] Alternatively, the control unit (700) may recognize that the door is opened to a set angle based on the elapsed time after the forward driving of the drive motor (210) begins.

[0257] Alternatively, the control unit (700) may recognize that the door is opened to a set angle based on the drive motor FG count value reaching a set FG count value after the planetary gear (510) is detected by the open position sensor (840) to have reached the open position (510(O)).

[0258] Alternatively, the control unit (700) may recognize that the door is opened to a set angle based on the passage of a set time after the planetary gear (510) is detected to have reached the open position (510(O)) by the open position sensor (840).

[0259] The control unit (700) can drive the drive motor (210) in the reverse direction (913, 914) until it recognizes that the planetary gear (510) has reached the neutral position (510(N)) based on recognizing that the door has been opened to a set angle.

[0260] Specifically, the control unit (700) can recognize that the planetary gear (510) has reached the neutral position (510(N)) based on the fact that the drive motor FG count value has reached the set FG count value after the reverse driving of the drive motor (210) has started.

[0261] Alternatively, the control unit (700) may recognize that the planetary gear (510) has reached the neutral position (510(N)) based on the elapsed time after the reverse driving of the drive motor (210) has begun.

[0262] Alternatively, the control unit (700) may recognize that the planetary gear (510) has reached the neutral position (510(N)) based on the detection by the position sensor (840, 850) that the planetary gear (510) has reached the neutral position (510(N)).

[0263] The control unit (700) can stop the drive motor (210) based on recognizing that the planetary gear (510) has reached the neutral position (510(N)) (915).

[0264] FIG. 24 is a diagram illustrating a control flow when an open command is received according to one embodiment of the present disclosure.

[0265] A door opening command can be received from the input interface (610) (920).

[0266] The control unit (700) can drive the drive motor (210) in the forward direction until it recognizes that the door is opened at a set angle based on a door opening command received through the input interface (610) (921, 912).

[0267] Specifically, the control unit (700) can recognize that the door is opened to a set angle based on the door opening angle detected by the angle sensor (810) reaching the set angle.

[0268] Alternatively, the control unit (700) may recognize that the door is opened to a set angle based on the driving motor FG count value reaching the set FG count value after the forward driving of the driving motor (210) begins.

[0269] Alternatively, the control unit (700) may recognize that the door is opened to a set angle based on the elapsed time after the forward driving of the drive motor (210) begins.

[0270] Alternatively, the control unit (700) may recognize that the door is opened to a set angle based on the drive motor FG count value reaching a set FG count value after the planetary gear (510) is detected by the open position sensor (840) to have reached the open position (510(O)).

[0271] Alternatively, the control unit (700) may recognize that the door is opened to a set angle based on the passage of a set time after the planetary gear (510) is detected to have reached the open position (510(O)) by the open position sensor (840).

[0272] The control unit (700) can drive the drive motor (210) in the reverse direction (923, 924) until it recognizes that the planetary gear (510) has reached the closed position (510(C)) based on recognizing that the door has been opened to a set angle.

[0273] Specifically, the control unit (700) can recognize that the planetary gear (510) has reached the closed position (510(C)) based on the fact that the drive motor FG count value has reached the set FG count value after the reverse driving of the drive motor (210) has started.

[0274] Alternatively, the control unit (700) may recognize that the planetary gear (510) has reached the closed position (510(C)) based on the elapsed time after the reverse driving of the drive motor (210) has begun.

[0275] Alternatively, the control unit (700) may recognize that the planetary gear (510) has reached the closed position (510(C)) based on the detection by the closed position sensor (850) that the planetary gear (510) has reached the closed position (510(C)).

[0276] The control unit (700) can drive the drive motor (210) in the forward direction (925, 926) until it recognizes that the planetary gear (510) has reached the neutral position (510(N)) based on recognizing that the planetary gear (510) has reached the closed position (510(C)).

[0277] Specifically, the control unit (700) can recognize that the planetary gear (510) has reached the neutral position (510(N)) based on the fact that the drive motor FG count value has reached the set FG count value after the forward drive of the drive motor (210) has started.

[0278] Alternatively, the control unit (700) may recognize that the planetary gear (510) has reached the neutral position (510(N)) based on the elapsed time after the forward driving of the drive motor (210) has begun.

[0279] Alternatively, the control unit (700) may recognize that the planetary gear (510) has reached the neutral position (510(N)) based on the detection by the position sensor (840, 850) that the planetary gear (510) has reached the neutral position (510(N)).

[0280] The control unit (700) can stop the drive motor (210) based on recognizing that the planetary gear (510) has reached the neutral position (510(N)) (927).

[0281] FIG. 25 is a diagram illustrating a control flow when an open command is received according to one embodiment of the present disclosure.

[0282] A door opening command can be received from the input interface (610) (930).

[0283] The control unit (700) can drive the drive motor (210) in the forward direction until it recognizes that the door is opened at a set angle based on a door opening command received through the input interface (610) (931, 932).

[0284] Specifically, the control unit (700) can recognize that the door is opened to a set angle based on the door opening angle detected by the angle sensor (810) reaching the set angle.

[0285] Alternatively, the control unit (700) may recognize that the door is opened to a set angle based on the driving motor FG count value reaching the set FG count value after the forward driving of the driving motor (210) begins.

[0286] Alternatively, the control unit (700) may recognize that the door is opened to a set angle based on the elapsed time after the forward driving of the drive motor (210) begins.

[0287] Alternatively, the control unit (700) may recognize that the door is opened to a set angle based on the drive motor FG count value reaching a set FG count value after the planetary gear (510) is detected by the open position sensor (840) to have reached the open position (510(O)).

[0288] Alternatively, the control unit (700) may recognize that the door is opened to a set angle based on the passage of a set time after the planetary gear (510) is detected to have reached the open position (510(O)) by the open position sensor (840).

[0289] The control unit (700) can stop the drive motor (210) for a set time based on recognizing that the door is opened at a set angle (933).

[0290] While the drive motor (210) is stopped for a set period of time, the push rod (330) can be restored backward (B) by the elastic force of the elastic member (370). Since the push rod (330) is engaged with the open gear (320) while being restored backward (B) by the elastic force of the elastic member (370), the speed of the return operation of the push rod (330) can be reduced. In addition, noise generated due to the rapid return and collision of the push rod (330) can be reduced.

[0291] The control unit (700) can drive the drive motor (210) in the reverse direction until it recognizes that the planetary gear (510) has reached the neutral position (510(N)) based on the elapsed time after recognizing that the door has been opened to a set angle (934, 935).

[0292] Specifically, the control unit (700) can recognize that the planetary gear (510) has reached the neutral position (510(N)) based on the fact that the drive motor FG count value has reached the set FG count value after the reverse driving of the drive motor (210) has started.

[0293] Alternatively, the control unit (700) may recognize that the planetary gear (510) has reached the neutral position (510(N)) based on the elapsed time after the reverse driving of the drive motor (210) has begun.

[0294] Alternatively, the control unit (700) may recognize that the planetary gear (510) has reached the neutral position (510(N)) based on the detection by the position sensor (840, 850) that the planetary gear (510) has reached the neutral position (510(N)).

[0295] The control unit (700) can stop the drive motor (210) based on recognizing that the planetary gear (510) has reached the neutral position (510(N)) (936).

[0296] FIG. 26 is a diagram illustrating a control flow when a closure command is received according to one embodiment of the present disclosure.

[0297] A door closing command can be received from the input interface (610) (940).

[0298] The control unit (700) can drive the drive motor (210) in reverse until it recognizes that the door is closed based on a door closing command received through the input interface (610) (941, 942).

[0299] Specifically, the control unit (700) can recognize that the door is closed based on the door opening angle detected by the angle sensor (810) reaching 0 degrees.

[0300] Alternatively, the control unit (700) may recognize that the door is closed based on the door being detected as closed by the open / close sensor (820).

[0301] The control unit (700) can drive the drive motor (210) in the forward direction until it recognizes that the planetary gear (510) has reached the neutral position (510(N)) based on recognizing that the door is closed (943, 944).

[0302] Specifically, the control unit (700) can recognize that the planetary gear (510) has reached the neutral position (510(N)) based on the fact that the drive motor FG count value has reached the set FG count value after the forward drive of the drive motor (210) has started.

[0303] Alternatively, the control unit (700) may recognize that the planetary gear (510) has reached the neutral position (510(N)) based on the elapsed time after the forward driving of the drive motor (210) has begun.

[0304] Alternatively, the control unit (700) may recognize that the planetary gear (510) has reached the neutral position (510(N)) based on the detection by the position sensor (840, 850) that the planetary gear (510) has reached the neutral position (510(N)).

[0305] The control unit (700) can stop the drive motor (210) based on recognizing that the planetary gear (510) has reached the neutral position (510(N)) (945).

[0306] FIG. 27 is a diagram illustrating a control flow when a closure command is received according to one embodiment of the present disclosure.

[0307] A door closing command can be received from the input interface (610) (950).

[0308] The control unit (700) can drive the drive motor (210) in the reverse direction until it recognizes that the door is closed based on a door closing command received through the input interface (610) (951, 952).

[0309] Specifically, the control unit (700) can recognize that the door is closed based on the door opening angle detected by the angle sensor (810) reaching 0 degrees.

[0310] Alternatively, the control unit (700) may recognize that the door is closed based on the door being detected as closed by the open / close sensor (820).

[0311] The control unit (700) can drive the drive motor (210) in the forward direction until it recognizes that the planetary gear (510) has reached the open position (510(O)) based on recognizing that the door is closed (953, 954).

[0312] Specifically, the control unit (700) can recognize that the planetary gear (510) has reached the open position (510(O)) based on the fact that the drive motor FG count value has reached the set FG count value after the forward driving of the drive motor (210) has started.

[0313] Alternatively, the control unit (700) may recognize that the planetary gear (510) has reached the open position (510(O)) based on the elapsed time after the forward driving of the drive motor (210) has begun.

[0314] Alternatively, the control unit (700) may recognize that the planetary gear (510) has reached the open position (510(O)) based on the detection by the open position sensor (840) that the planetary gear (510) has reached the open position (510(O)).

[0315] The control unit (700) can drive the drive motor (210) in the reverse direction (955, 956) until it recognizes that the planetary gear (510) has reached the neutral position (510(N)) based on recognizing that the planetary gear (510) has reached the open position (510(O)).

[0316] Specifically, the control unit (700) can recognize that the planetary gear (510) has reached the neutral position (510(N)) based on the fact that the drive motor FG count value has reached the set FG count value after the reverse driving of the drive motor (210) has started.

[0317] Alternatively, the control unit (700) may recognize that the planetary gear (510) has reached the neutral position (510(N)) based on the elapsed time after the reverse driving of the drive motor (210) has begun.

[0318] Alternatively, the control unit (700) may recognize that the planetary gear (510) has reached the neutral position (510(N)) based on the detection by the position sensor (840, 850) that the planetary gear (510) has reached the neutral position (510(N)).

[0319] The control unit (700) can stop the drive motor (210) based on recognizing that the planetary gear (510) has reached the neutral position (510(N)) (957).

[0320] As described above, according to one embodiment of the present disclosure, the door opening / closing device (100) can implement door opening and closing operations using a single drive motor (210). Therefore, manufacturing costs and energy consumption can be reduced. Furthermore, the structure of the door opening / closing device can be simplified.

[0321] A door opening / closing device (100) according to one embodiment of the present disclosure uses a push structure that can pressurize the door when opening the door and a link structure that pulls the door when closing the door, so that the door opening operation and the door closing operation can be performed efficiently and smoothly.

[0322] According to the door opening / closing device (100) of one embodiment of the present disclosure, not only can the door be automatically opened / closed through the door opening / closing device (100), but also a user can manually open / close the door.

[0323] In particular, after the door is automatically opened or closed by the door opening / closing device (100), the planetary gear (510) can be moved to the neutral position (510(N)).

[0324] When the planetary gear (510) is in the neutral position (510(N)), the planetary gear (510) is not connected to the open gear train and the closed gear train, so that the door opening / closing device (100) may not act as a load during manual operation, and smooth manual operation is possible.

[0325] In this disclosure, the technical idea of ​​the present disclosure is described with reference to a refrigerator, which is one of home appliances. However, the present disclosure is not limited to refrigerators among home appliances, and can be equally applied to other home appliances, such as dishwashers and ovens, which have a main body having a storage space capable of accommodating items for processing items according to a specific purpose, and a door provided to open and close the storage space.

[0326] While the technical concept of the present invention has been described above through specific examples, the scope of the present invention is not limited to these examples. Various embodiments that can be modified or altered by those skilled in the art without departing from the spirit of the present invention as defined in the claims are also within the scope of the present invention.

Claims

1. A body having a receiving space; a door for opening and closing the above-mentioned accommodation space; and A door opening / closing device provided in the main body, comprising a door opening / closing device configured to open / close the door when the door opening / closing device is provided in the main body; The above door opening and closing device, A push unit including a push rod configured to push the door to open the door, and an opening gear train connected to the push rod to move the push rod; A link section including a link connected to the door and configured to close the door, and a closing gear train connected to the link and configured to move the link; A driving unit including a driving motor and a sun gear connected to the driving motor, wherein the driving motor is configured to generate a driving force to rotate the sun gear; and A home appliance comprising a clutch unit that is connected to the sun gear and configured to rotate together with the sun gear, and includes a planetary gear that is movable between an open position connected to the open gear train and a closed position connected to the closed gear train, and transmits the driving force of the driving motor to the push unit based on the planetary gear in the open position or transmits the driving force of the driving motor to the link unit based on the planetary gear in the closed position; 2. In paragraph 1, An input interface for receiving open and close commands; and A home appliance further comprising a control unit that controls the drive motor to open the door based on the opening command received through the input interface, and controls the drive motor to close the door based on the closing command received through the input interface.

3. In paragraph 2, The above control unit, Drive the drive motor in the forward direction until it is recognized that the door is opened at a set angle based on the opening command received through the input interface; An appliance that drives the drive motor in reverse until the planetary gear reaches the neutral position based on recognizing that the door is opened to the set angle.

4. In paragraph 2, The above control unit, Drive the drive motor in reverse until it is recognized that the door is closed based on the closing command received through the input interface; An appliance that drives the drive motor in the forward direction until the planetary gear reaches the neutral position based on recognizing that the door is closed.

5. In paragraph 1. An electrical appliance in which the above planetary gear is configured to mesh with the above sun gear.

6. In paragraph 1, An appliance in which the planetary gear is capable of revolving around the sun gear between the open position and the closed position in conjunction with the rotation of the sun gear when the planetary gear is between the open position and the closed position.

7. In paragraph 1, When the planetary gear is in the open position, the planetary gear can rotate together with the rotation of the sun gear, and the open gear of the open gear train rotates together with the rotation of the planetary gear, An electrical appliance in which, when the planetary gear is in the closed position, the planetary gear can rotate together with the rotation of the sun gear, and the closed gear of the closed gear train rotates together with the rotation of the planetary gear.

8. In paragraph 1, A home appliance in which the driving part includes a sun gear pin provided to penetrate the center of the sun gear to guide rotation of the sun gear.

9. In paragraph 8, The clutch part includes a carrier plate that is rotatable around the sun gear pin, The above planetary gear is a home appliance mounted on the carrier plate.

10. In paragraph 9, A home appliance including a friction member that generates frictional force between the planetary gear and the carrier plate so that the planetary gear revolves around the sun gear along with the rotation of the sun gear.

11. In paragraph 9, An electrical appliance in which the clutch portion includes a planetary gear pin fixed to the carrier plate so as to be inserted into the center of the planetary gear to guide rotation of the planetary gear.

12. In paragraph 1, The above push rod is an appliance capable of moving linearly between a maximum forward position and a maximum backward position.

13. In paragraph 12, An electrical appliance in which the push portion includes an elastic member that elastically biases the push rod to the maximum backward position.

14. In paragraph 11, A hinge connecting the main body and the door and supporting the door so as to be rotatable relative to the main body; A cam coupled to the above hinge and having a guide surface; and A home appliance comprising a lever device coupled to the door and having a lever arranged to contact the cam when the door is opened or closed.

15. In paragraph 14, The guide surface includes a first contact surface provided to apply force in a direction in which the lever closes the door when the lever is in contact, a second contact surface provided to transmit force in a direction in which the lever opens the door when the lever is in contact, and a curved point provided between the first contact surface and the second contact surface. An appliance in which the lever passes the bending point and contacts the second contact surface when the push rod is at the maximum forward position.

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