Automatic door opening device and refrigerator

Abstract

The utility model discloses an automatic door opening device and a refrigerator, and belongs to the technical field of electrical equipment. The automatic door opening device comprises a driving part; the transmission assembly comprises a first gear, a harmonic speed reducing mechanism and a second gear, the first gear is meshed with the driving part, and the input end and the output end of the harmonic speed reducing mechanism are connected with the first gear and the second gear respectively; and the door jacking piece is meshed with the second gear. The automatic door opening device and the refrigerator are small in overall height and simple in structure.

Description

Technical Field

[0001] This application belongs to the field of electrical equipment technology, and in particular relates to an automatic door opening device and a refrigerator. Background Technology

[0002] Some refrigerators are equipped with an automatic door opening device to drive the door to open automatically, thereby improving the convenience of using the refrigerator. Typically, the automatic door opening device consists of a drive motor, a transmission gear set, and a push rod. The transmission gear set converts the torque output by the drive motor into the pushing torque of the push rod, thereby opening the door.

[0003] Because of the significant opening resistance between the door and the refrigerator body, the transmission gear set needs a large reduction ratio to ensure that the force transmitted to the push rod is sufficient to open the door. This necessitates a multi-stage, multi-layered gear set, resulting in a complex overall structure, a large surface area and height, and a larger overall size for the door opening mechanism. This requires more installation space on the refrigerator, increasing the difficulty of installation. Summary of the Invention

[0004] This application provides an automatic door opening device and a refrigerator, aiming to at least partially solve the technical problems of the complex structure and large height of the transmission gear set in the automatic door opening mechanism. Therefore,

[0005] One aspect of this application provides an automatic door opening device, comprising:

[0006] Drive components;

[0007] The transmission assembly includes a first gear, a harmonic reduction mechanism, and a second gear. The first gear meshes with the driving component, and the input and output ends of the harmonic reduction mechanism are respectively connected to the first gear and the second gear.

[0008] The top door component meshes with the second gear.

[0009] In some embodiments, the harmonic deceleration mechanism includes:

[0010] A rigid gear having a first annular tooth;

[0011] A flexible gear has a second annular tooth and a first mating surface. The flexible gear is sleeved with the rigid gear. The first annular tooth and the second annular tooth mesh with each other, and the flexible gear is connected to the second gear.

[0012] A wave generator is coaxially connected to the first gear. The wave generator has a second mating surface that abuts against the first mating surface. The second mating surface slides with the first mating surface, and the distance between the second mating surface and the rotating shaft of the wave generator is greater than the inner diameter of the flexible gear, so that the flexible gear deforms when the wave generator rotates with the first gear.

[0013] In some embodiments, the wave generator is disposed with the flexible gear ring.

[0014] In some embodiments, both the rigid gear and the flexible gear are annular, the first annular tooth is disposed on the inner circumferential surface of the rigid gear, the second annular tooth is disposed on the outer circumferential surface of the flexible gear, the first mating surface is the inner circumferential surface of the flexible gear, and the flexible gear is nested inside the rigid internal gear.

[0015] The second mating surface is disposed on the outer peripheral surface of the wave generator, and the wave generator is nested inside the flexible gear.

[0016] In some embodiments, the wave generator includes:

[0017] A connecting arm is attached to the first gear;

[0018] The roller assembly includes a plurality of rollers mounted on the connecting arm, and the wheel surface of the rollers that abuts against the first mating surface is configured as the second mating surface.

[0019] In some embodiments, there are two rollers, which are symmetrical about the axis of the first gear.

[0020] In some embodiments, the distance between the opposite circumferential sides of the two rollers is greater than the inner diameter of the flexible gear.

[0021] In some embodiments, the transmission assembly further includes:

[0022] The first double gear has a first round tooth portion and a first non-round tooth portion arranged coaxially, and the first round tooth portion meshes with the second gear.

[0023] The second double gear has a second round tooth portion and a second non-round tooth portion arranged coaxially. The second round tooth portion meshes with the top door component, and the second non-round tooth portion meshes with the first non-round tooth portion. During the process of the top door component pushing the door body, the speed ratio between the first non-round tooth portion and the second non-round tooth portion tends to decrease.

[0024] In some embodiments, the first non-circular tooth portion and the second non-circular tooth portion are both elliptical tooth portions of the same specification, and the length of the line connecting the rotation axes of the first non-circular tooth portion and the second non-circular tooth portion is the length of the major axis of the elliptical tooth portion.

[0025] Another aspect of this application embodiment also provides a refrigerator, comprising:

[0026] The equipment body includes a housing and a door, with the door covering the housing;

[0027] The automatic door opening device is installed in the housing and drives the door to open relative to the housing during the process of the top door component pushing the door.

[0028] The embodiments of this application have at least the following beneficial effects:

[0029] The automatic door opening device and refrigerator provided in this application include a drive component, a transmission mechanism, and a top door component. The drive component is connected to the top door component via a transmission assembly to realize a mechanical door opening device. The transmission assembly includes an integrated first gear, a harmonic reduction mechanism, and a second gear. The first gear meshes with the drive component, and the second gear meshes with the top door component. The harmonic reduction mechanism is connected to the first gear and the second gear respectively. The harmonic reduction mechanism realizes a large reduction ratio transmission between the drive component and the top door component, thereby reducing the number of gears and layers to a certain extent while meeting the large reduction ratio, so as to reduce the complexity and height of the transmission assembly and the automatic door opening device as a whole. Attached Figure Description

[0030] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0031] Figure 1 A schematic diagram of the automatic door opening device in an embodiment of this application is shown;

[0032] Figure 2 It shows Figure 1 A schematic diagram of the transmission component in the automatic door opening device;

[0033] Figure 3 It shows Figure 1 A partial sectional view of the transmission component in the automatic door opening device;

[0034] Figure 4 It shows Figure 2 A schematic diagram of the harmonic reduction mechanism of the transmission component in the diagram;

[0035] Figure 5 It shows Figure 1 A half-sectional view of the transmission component in the automatic door opening device;

[0036] Figure 6 It shows Figure 4 A schematic diagram of the rigid gear structure in the harmonic reduction mechanism;

[0037] Figure 7 It shows Figure 4 A schematic diagram of the flexible gear structure in the harmonic reduction mechanism;

[0038] Figure 8 It shows Figure 4 A schematic diagram of the wave generator in the harmonic deceleration mechanism.

[0039] Figure label:

[0040] 1-Driver component, 11-Motor, 12-Worm gear;

[0041] 2-Transmission assembly, 21-First gear, 21a-First rotating shaft, 22-Harmonic reduction mechanism, 221-Rigid gear, 221a-First ring gear, 222-Flexible gear, 222a-Second ring gear, 222b-First mating surface, 223-Wave generator, 223a-Second mating surface, 223b-Connecting arm, 223c-Roller assembly, 24-First double gear, 241-First circular tooth, 242-Second non-circular tooth, 25-Second double gear, 251-Second circular tooth, 252-Second non-circular tooth, 26-First adapter gear, 27-Second adapter gear;

[0042] 3-Top door fitting;

[0043] 4. Installation foundation. Detailed Implementation

[0044] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of the embodiments. Based on the embodiments of this application, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of this application.

[0045] Furthermore, reference numerals and / or reference letters may be repeated in different examples in this application. Such repetition is for simplification and clarity purposes and does not in itself indicate a relationship between the various embodiments and / or settings discussed. In addition, this application provides examples of various specific processes and materials; however, those skilled in the art will recognize the application of other processes and / or the use of other materials.

[0046] This application is described below with reference to the accompanying drawings and specific embodiments:

[0047] The negative pressure between the refrigerator door and the cabinet, and other opening resistance, increases the difficulty of opening the door. To address this, some refrigerators are equipped with automatic door opening devices to improve ease of use. Typically, to overcome this resistance, the automatic door opening device requires a gear transmission assembly with a large reduction ratio between the drive component and the top door component. This results in a large number of gear stages and layers, making the overall structure of the gear transmission assembly complex, requiring a large installation height and area within the refrigerator, which is not ideal for installation.

[0048] Therefore, embodiments of this application provide an automatic door opening device and a refrigerator, which aim to reduce the complexity of the gear transmission assembly, reduce the overall height, and reduce the spread area to a certain extent; so as to reduce the structural complexity, height and volume of the door opening device and improve the assembly applicability of the automatic door opening device.

[0049] Figure 1 A schematic diagram of the automatic door opening device in an embodiment of this application is shown; Figure 2 It shows Figure 1 A schematic diagram of the transmission component in the automatic door opening device; Figure 3 It shows Figure 1 A partial sectional view of the transmission component in the automatic door opening device; Figure 4 It shows Figure 2 A schematic diagram of the harmonic reduction mechanism of the transmission component in the diagram; Figure 5 It shows Figure 1 A half-sectional view of the transmission component in the automatic door opening device; Figure 6 It shows Figure 4 A schematic diagram of the rigid gear structure in the harmonic reduction mechanism; Figure 7 It shows Figure 4 A schematic diagram of the flexible gear structure in the harmonic reduction mechanism; Figure 8 It shows Figure 4 A schematic diagram of the wave generator in the harmonic deceleration mechanism.

[0050] See Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 , Figure 6 , Figure 7 and Figure 8In some embodiments, the automatic door opening device adopts a mechanical device based on a transmission gear set, including a drive component 1, a transmission assembly 2, and a top door component 3. The transmission mechanism 2 is connected to the drive component 1 and the top door component 3 respectively, so that the drive component 1 outputs a driving torque and transmits it to the top door component 3 through the transmission assembly 2 to push the refrigerator door body to deflect relative to the cabinet body, thereby realizing the door opening operation.

[0051] The drive component 1 is a drive torque output device, capable of outputting various forms of drive torque, such as torque. In the automatic door opening device, the drive component 1 can be configured as a motor 11. By controlling the power signal applied to the motor 11, the operation and shutdown of the drive component 1, as well as the magnitude of the drive torque, can be realized.

[0052] The top door component 3 is the main body that directly interacts with the refrigerator door. Under external force, it pushes the door to open. The movement of the top door component 3 can be configured as linear movement, arc movement, or other movement methods.

[0053] The transmission assembly 2 receives the driving torque output from the drive component 1 and transmits it to the top door component 3; during the transmission of the driving torque, a certain degree of deceleration is performed. In order to meet the requirement of the automatic door opening mechanism to overcome the opening resistance, the transmission assembly 2 needs to have a large reduction ratio.

[0054] The transmission component 2 is a gear transmission mechanism, which may include a first gear 21, a harmonic reduction mechanism 22 and a second gear 23. The first gear 21 is matched to mesh with the driving member 1, and the second gear 23 is matched to mesh with the top door member 3. The harmonic reduction mechanism 22 connects the first gear 21 and the second gear 23, thereby transmitting the driving torque output by the driving member 1 to the top door member 3 to drive the top door member 3 to push and open the door.

[0055] The input end of the harmonic reduction mechanism 22 is connected to the first gear 21, and the output end of the harmonic reduction mechanism 22 is connected to the second gear 23. This utilizes the large reduction ratio characteristic of the harmonic reduction mechanism 22 to achieve a large reduction ratio transmission between the drive component 1 and the top door component 3. The harmonic reduction mechanism 22 can meet the requirements of a large reduction ratio while also featuring a simple structure and small height and volume. Therefore, while meeting the large reduction ratio requirements of the transmission assembly 2, it can also reduce the number of transmission gear stages in the transmission assembly 2 to a certain extent, simplifying the overall structure and reducing the overall height.

[0056] Generally, an automatic door opening and closing device has a mounting base 4, such as a base or a top cover; the aforementioned drive component 1, transmission assembly 2, and top door component 3 are all directly or indirectly mounted on the mounting base 4; the mounting base 4 also has various forms of functional structures for adapting and mounting the aforementioned drive component 1, transmission assembly 2, and top door component 3. A worm gear 12 is connected to the output shaft of the motor 11 and meshes with the first gear 21.

[0057] In some embodiments, the harmonic deceleration mechanism 22 can be configured as a transmission deceleration mechanism based on the elastic deformation of a flexible gear and the differential tooth motion between rigid and flexible gears. It may include a rigid gear 221, a flexible gear 222, and a wave generator 223. The rigid gear 221 and the flexible gear 222 are fitted together. The wave generator 223 is slidably engaged with the flexible gear 222, and there is a certain contact pressure between the wave generator 223 and the flexible gear 222, which can cause the flexible gear 222 to generate a certain continuous deformation, so as to realize the dynamic meshing between the flexible gear 222 and the rigid gear 221, thereby realizing the differential tooth motion between the wave generator 223 and the flexible gear 222, and realizing deceleration transmission.

[0058] Among them, the wave generator 223 can be coaxially connected to the first gear 21, so that the wave generator 223 can rotate coaxially with the first gear 21 and serve as the input end of the harmonic generation mechanism 2. Thus, during the rotation of the wave generator 223, the flexible gear 222 is driven to deform along its circumference.

[0059] In some embodiments, to achieve stable meshing transmission between the rigid gear 221 and the flexible gear 222, a first annular tooth 221a is provided on one circumferential surface of the rigid gear 221, and a second annular tooth 221a is provided on one circumferential surface of the flexible gear 222. The first annular tooth 221a and the second annular tooth 221a maintain a matched ring-like state and are stably meshed. Under the drive of the wave generator 223, the meshing portion of the second annular tooth 221a and the first annular tooth 221a changes continuously along the circumference of the second annular tooth 221a, thereby enabling the flexible gear 2221 to rotate relative to the first annular tooth 221a to achieve torque transmission.

[0060] To maintain the stability of the sliding contact between the flexible gear 222 and the wave generator 223, the flexible gear 222 is provided with a first mating surface 222b, and the wave generator 223 is provided with a second mating surface 223a, with the second mating surface 223a slidingly engaging with the first mating surface 222b. Driven by the wave generator 223, the flexible gear 222 undergoes a shape change, causing the portion of the second mating surface 223a that is slidingly engaged with the first mating surface 222b to move circumferentially along the second annular tooth 221a.

[0061] Generally, in order to adapt to the annular shape of the second annular tooth 221a, the wave generator 223 is set to operate in a fixed-axis rotation mode, and the distance between the second mating surface 223a and the rotating shaft of the wave generator 223 is greater than the inner diameter of the flexible gear 222, so that the flexible gear 222 generates radial tensile deformation to realize the meshing transmission between the second annular tooth 221a and the first annular tooth 221a.

[0062] In some embodiments, the wave generator 223 may be ring-fitted with the flexible gear 222. The wave generator 223 may be disposed inside the flexible gear 222 and rotate on a fixed axis inside the flexible gear 222, and push the flexible gear 222 to deform during the rotation.

[0063] Of course, part of the main body of the wave generator 223 can be placed on the outside of the flexible gear 222, and part of the main body can be placed inside the flexible gear 222, so that the flexible gear 222 is deformed during rotation.

[0064] When the wave generator 223 rotates, the second mating surface 223a pushes the first mating surface 222b outward along the radial direction of the flexible gear 222, forcing the flexible gear 222 to deform radially outward.

[0065] In some embodiments, the rigid gear 221 and the flexible gear 222 may be configured as annular members, and the flexible gear 222 is embedded in the rigid gear 221; correspondingly, the first annular tooth 221a is disposed on the inner circumferential surface of the rigid gear 221, the second annular tooth is disposed on the outer circumferential surface of the flexible gear 222, the first mating surface 222b may be disposed on the inner circumferential surface of the flexible gear 222, and the second mating surface 223a is disposed on the outer circumferential surface of the wave generator 223, the wave generator 223 is nested inside the flexible gear 222.

[0066] In some embodiments, the wave generator 223 rolls into contact with the flexible gear 222 to reduce wear and improve sliding smoothness. Therefore, the wave generator 223 may include a connecting arm 223b and a roller assembly 223c. The connecting arm 223b is connected to the first gear 21 and rotates with it. The roller assembly 223c is mounted on the connecting arm 223b and rolls against the first mating surface 222b.

[0067] Correspondingly, the second mating surface 223a is configured as a wheel surface that abuts against the first mating surface 222b.

[0068] In some embodiments, the roller assembly 223c may contain multiple rollers, and the multiple rollers in the roller assembly 223c roll against the first mating surface 222b respectively, pushing and deforming the flexible gear 222.

[0069] Multiple rollers in roller assembly 223c are spaced apart along the rotation direction of connecting arm 223b to achieve multi-point rolling support, thereby ensuring the morphological stability of flexible gear 222.

[0070] In some embodiments, the number of rollers in the roller assembly 223c can be set to two, and the two rollers are symmetrically arranged about the axis of the first rotating shaft 21a of the first gear 21. During the rotation of the connecting arm 223b following the first gear 21, the two rollers rotate coaxially with the first gear 21 as a whole; thereby maintaining stable and uniform support for the flexible gear 222 during the rotation of the wave generator 223 following the first gear 21.

[0071] It is worth noting that, in the direction of the connection between the two rollers, the two opposing wheel surfaces are configured as the second mating surface 223a, and the distance between them is greater than the diameter of the flexible gear 222. This allows the flexible gear 222 to be spread into a near-elliptical shape, so that only two teeth of the flexible gear 222, which are symmetrical about the axis of rotation, mesh with the first ring tooth 221a. This balances the meshing reliability and force uniformity between the flexible gear 222 and the rigid gear 221.

[0072] In some embodiments, the first gear 21, the connecting arm 223b, and the second gear 23 can be coaxially arranged, and the shaft of the first gear 21 can be rotatably engaged with the second gear 23 and the connecting arm 223b. One end of the shaft of the first gear 21 is fixed to the first gear 21, and the other end is rotatably arranged on the mounting base 4.

[0073] In some embodiments, considering that the force state of the door during the opening process can generally be divided into two typical states that occur sequentially, namely, the state of overcoming a large opening resistance and the state of overcoming a small turning resistance, the automatic door opening mechanism requires a large force to overcome the opening resistance and the door rotation speed is relatively small; after overcoming the opening resistance, the force required to turn the door is small, and the door rotation speed is relatively fast when the opening force is equal.

[0074] To maintain stable contact between the automatic door opening device and the door body during opening and revolving processes, the moving speed of the top door component 3 should be comparable to the moving speed of the door body. During the revolving process, the moving speed of the top door component 2 should have a significant acceleration process. Therefore, the transmission assembly 2 also includes a first double gear 24 and a second double gear 25. The first double gear 24 and the second double gear 25 mesh, and the first double gear 24 also meshes with a second gear 23. The second double gear 25 meshes with the top door component 3.

[0075] In order to achieve the deceleration drive of the top door component 3, the first double gear 24 and the second double gear 25 adopt a non-circular gear meshing form, and ensure that the speed ratio between the first double gear 24 and the second double gear 25 tends to decrease during the process of pushing the top door. When the speed of the second gear 23 is constant, the output speed of the second double gear 25 will increase.

[0076] Therefore, the first double gear 24 has a first round tooth portion 241 and a first non-round tooth portion 242 arranged coaxially. The first round tooth portion 241 meshes with the second gear 23. The second double gear 25 has a second round tooth portion 251 and a second non-round tooth portion 252 arranged coaxially. The second round tooth portion 251 meshes with the top door member 3, and the second non-round tooth portion 252 meshes with the first non-round tooth portion 251. During the process of the top door member 3 pushing the door body, the speed ratio between the first non-round tooth portion 242 and the second non-round tooth portion 252 tends to decrease.

[0077] In some embodiments, the first round tooth portion 241 and the first non-round tooth portion 242 are stacked along the axial direction of the shaft of the first double gear 24; the second round tooth portion 251 and the second non-round tooth portion 252 are stacked along the axial direction of the shaft of the second double gear 25.

[0078] In some embodiments, the first non-circular tooth portion 242 and the second non-circular tooth portion 252 are elliptical tooth portions of the same specification; and in order to maintain stable meshing of the first non-circular tooth portion 242 and the second non-circular tooth portion 252 and reduce the risk of jamming or meshing failure, the length of the line connecting the pivots of the first non-circular tooth portion 242 and the second non-circular tooth portion 252 is the length of the major axis of the elliptical tooth portion.

[0079] In some embodiments, in order to accommodate the internal structural layout of the mounting base 4 and to minimize the overall area occupied, it is necessary to make transitions between the functional components. For example, one or more stages of first transition gears 26 may be provided between the first gear 21 and the worm gear 12; one or more stages of second transition gears 27 may be connected between the second gear 23 and the first double gear 24.

[0080] In some embodiments, the top door member 3 may be a top rod, and the top rod may be movable along its length direction. The top rod has spaced teeth along its length direction and engages with the second circular tooth portion 251.

[0081] In some embodiments, a refrigerator equipped with the above-mentioned automatic door opening device is also provided, including a device body and the above-mentioned automatic door opening device; the device body includes a cabinet and a door covering the cabinet, and the automatic door opening device can be disposed on the cabinet. During the process of the door pusher pushing the door, the door is driven to move relative to the cabinet in the opening direction.

[0082] The embodiments of this application have at least the following beneficial effects:

[0083] The automatic door opening device and refrigerator provided in this application include a drive component, a transmission mechanism, and a top door component. The drive component is connected to the top door component via a transmission assembly to realize a mechanical door opening device. The transmission assembly includes an integrated first gear, a harmonic reduction mechanism, and a second gear. The first gear meshes with the drive component, and the second gear meshes with the top door component. The harmonic reduction mechanism is connected to the first gear and the second gear respectively. The harmonic reduction mechanism realizes a large reduction ratio transmission between the drive component and the top door component, thereby reducing the number of gears and layers to a certain extent while meeting the large reduction ratio, so as to reduce the complexity and height of the transmission assembly and the automatic door opening device as a whole.

[0084] In this application, unless otherwise expressly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature being directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature being directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0085] In the description of this application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", and "counterclockwise" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0086] It should be noted that all directional indications in the embodiments of this application are only used to explain the relative positional relationship and movement of each component in a specific posture. If the specific posture changes, the directional indications will also change accordingly.

[0087] In this application, unless otherwise expressly specified and limited, the terms "connection," "fixed," etc., should be interpreted broadly. For example, "fixed" can mean a fixed connection, a detachable connection, or an integral part; it can mean a mechanical connection or an electrical connection; it can mean a direct connection or an indirect connection through an intermediate medium; it can mean the internal communication of two components or the interaction between two components, unless otherwise expressly limited. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0088] Furthermore, the use of terms such as "first" and "second" in this application is for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, features defined with "first" or "second" may explicitly or implicitly include one or more of the stated features. In the description of this application, "multiple" means two or more, unless otherwise explicitly specified.

[0089] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. In addition, those skilled in the art can combine and integrate the different embodiments or examples described in this specification.

[0090] Furthermore, the technical solutions of the various embodiments can be combined with each other, but only if they are based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be considered that such combination of technical solutions does not exist and is not within the scope of protection claimed in this application.

[0091] Although embodiments of this application have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of this application, the scope of which is defined by the claims and their equivalents.

Claims

1. An automatic door opening device, characterized in that, include: Drive components; The transmission assembly includes a first gear, a harmonic reduction mechanism, and a second gear. The first gear meshes with the driving component, and the input and output ends of the harmonic reduction mechanism are respectively connected to the first gear and the second gear. The top door component meshes with the second gear.

2. The automatic door opening device as described in claim 1, characterized in that, The harmonic deceleration mechanism includes: A rigid gear having a first annular tooth; A flexible gear has a second annular tooth and a first mating surface. The flexible gear is sleeved with the rigid gear. The first annular tooth and the second annular tooth mesh with each other, and the flexible gear is connected to the second gear. A wave generator is coaxially connected to the first gear. The wave generator has a second mating surface that abuts against the first mating surface. The second mating surface slides with the first mating surface, and the distance between the second mating surface and the rotating shaft of the wave generator is greater than the inner diameter of the flexible gear, so that the flexible gear deforms when the wave generator rotates with the first gear.

3. The automatic door opening device as described in claim 2, characterized in that, The wave generator is fitted with the flexible gear ring.

4. The automatic door opening device as described in claim 2, characterized in that, Both the rigid gear and the flexible gear are annular. The first annular tooth is disposed on the inner circumferential surface of the rigid gear, and the second annular tooth is disposed on the outer circumferential surface of the flexible gear. The first mating surface is the inner circumferential surface of the flexible gear, and the flexible gear is nested inside the rigid gear. The second mating surface is disposed on the outer peripheral surface of the wave generator, and the wave generator is nested inside the flexible gear.

5. The automatic door opening device as described in claim 4, characterized in that, The wave generator includes: A connecting arm is attached to the first gear; The roller assembly includes a plurality of rollers mounted on the connecting arm, and the wheel surface of the rollers that abuts against the first mating surface is configured as the second mating surface.

6. The automatic door opening device as described in claim 5, characterized in that, There are two rollers, and the two rollers are symmetrical about the axis of the first gear.

7. The automatic door opening device as described in claim 6, characterized in that, The distance between the opposing circumferential sides of the two rollers is greater than the inner diameter of the flexible gear.

8. The automatic door opening device according to any one of claims 1 to 7, characterized in that, The transmission assembly also includes: The first double gear has a first round tooth portion and a first non-round tooth portion arranged coaxially, and the first round tooth portion meshes with the second gear. The second double gear has a second round tooth portion and a second non-round tooth portion arranged coaxially. The second round tooth portion meshes with the top door component, and the second non-round tooth portion meshes with the first non-round tooth portion. During the process of the top door component pushing the door body, the speed ratio between the first non-round tooth portion and the second non-round tooth portion tends to decrease.

9. The automatic door opening device as described in claim 8, characterized in that, Both the first non-circular tooth portion and the second non-circular tooth portion are elliptical tooth portions of the same specification, and the length of the line connecting the rotation axes of the first non-circular tooth portion and the second non-circular tooth portion is the length of the major axis of the elliptical tooth portion.

10. A refrigerator, characterized in that, include: The equipment body includes a housing and a door, with the door covering the housing; The automatic door opening device as described in any one of claims 1 to 9 is installed in the housing and drives the door to open relative to the housing during the process of the top door member pushing the door.

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