Clutch, automatic door opening device and refrigerator

Abstract

The utility model discloses a clutch, an automatic door opening device and a refrigerator, and belongs to the technical field of electrical equipment. The clutch comprises a first connecting piece and a second connecting piece, the first connecting piece is provided with an assembling cavity, and a limiting groove is formed in the inner wall of the assembling cavity; the second connecting piece is rotationally matched with the first connecting piece, the second connecting piece is provided with a shifting arm, and the shifting arm is rotationally arranged in the assembling cavity; the rolling piece is arranged between the shifting arm and the inner wall of the assembly cavity in a rolling mode, so that when the second connecting piece and the first connecting piece rotate relatively, the rolling piece is embedded into the limiting groove and abuts against the shifting arm, and the second connecting piece and the first connecting piece rotate in the same direction. According to the clutch, the automatic door opening device and the refrigerator, impact at the starting moment can be effectively buffered, and impact damage is reduced.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of electrical appliances, and particularly relates to a clutch, an automatic door opening device, and a refrigerator. BACKGROUND

[0002] Some refrigerator products are provided with an automatic door opening device for driving the door body to automatically open, thereby improving the convenience of using the refrigerator. Generally, the automatic door opening device is provided with a driving motor, a transmission mechanism, and a top door piece and other components, and the transmission mechanism converts the torque output by the driving component into the pushing torque of the top rod, so as to top the door body.

[0003] Although the automatic door opening device improves the convenience of opening the door, at the moment when the driving motor of the automatic door opening device starts, the transmission mechanism will be impacted, increasing the risk of damage to the transmission mechanism. Moreover, when the top door piece is in a working state, the impact of external factors will also increase the risk of impact damage to the transmission mechanism and even the driving mechanism. SUMMARY

[0004] The present application provides a clutch, an automatic door opening device, and a refrigerator, aiming to at least solve the technical problem that the transmission mechanism and the driving motor are easily impacted and damaged at the moment when the driving motor of the automatic door opening device starts and the top door piece is impacted and retracted. To this end,

[0005] In one aspect of the present application, a clutch is provided, comprising:

[0006] The first connecting piece is provided with an assembly cavity, and a limiting groove is formed in the inner wall of the assembly cavity;

[0007] The second connecting piece is rotationally matched with the first connecting piece, and the second connecting piece is provided with a pushing arm, which is rotationally arranged in the assembly cavity;

[0008] The rolling piece is rotationally arranged between the pushing arm and the inner wall of the assembly cavity, so that when the second connecting piece and the first connecting piece rotate relative to each other, the rolling piece is embedded in the limiting groove and abuts against the pushing arm, so that the second connecting piece and the first connecting piece rotate in the same direction.

[0009] In some embodiments, the clutch further comprises a magnetic piece, which is at least partially located in the assembly cavity to apply a magnetic force in a direction away from the limiting groove to the rolling piece, and when the pushing arm rotates, the magnetic force is smaller than the pushing force exerted by the pushing arm on the rolling piece.

[0010] In some embodiments, the limiting groove is formed in the circumferential inner wall of the assembly cavity, and the rolling piece and the pushing arm are arranged between the axial inner wall of the assembly cavity and the magnetic piece.

[0011] In some embodiments, the first connecting member comprises a first shaft body, the second connecting member comprises a second shaft body coaxially arranged with the first shaft body, and the assembly cavity is arranged at an axial end of the first shaft body, and the push arm is arranged on a circumferential surface of the second shaft body.

[0012] In some embodiments, one of the axial end surfaces of the first shaft body and the second shaft body is provided with a positioning groove, and the other is provided with a positioning shaft which is rotationally embedded in the positioning groove, and the positioning groove, the positioning shaft, the second shaft body and the first shaft body are coaxially arranged.

[0013] In some embodiments, the clutch further comprises a housing which is arranged at least on the end side of the first connecting member and the second connecting member which are axially away from each other, and at least one of the first shaft body and the second shaft body is rotationally matched with the housing.

[0014] In some embodiments, the housing comprises a first housing and a second housing which are buckled, the first shaft body is rotationally arranged in the shaft hole of the first housing, and the second shaft body is rotationally arranged in the shaft hole of the second housing.

[0015] In some embodiments, the side surface of the push arm which is in contact with the rolling member is provided with a guide inclined surface to guide the rolling member to move away from the rotation axis of the push arm when the push arm pushes the rolling member.

[0016] In some embodiments, the limiting grooves are a plurality of limiting grooves which are arranged on the inner wall of the assembly cavity in the rotation direction of the push arm;

[0017] and / or the push arms are a plurality of push arms which are equally spaced around the circumference of the rotation axis of the push arm.

[0018] Another aspect of the embodiments of the present application further provides an automatic door opening device comprising a motor, a transmission assembly, a door opening member and the clutch.

[0019] The clutch is connected between the output shaft of the motor and the transmission assembly, and the transmission assembly is connected with the door opening member.

[0020] Alternatively, the clutch is arranged in the transmission assembly.

[0021] Another aspect of the embodiments of the present application further provides a refrigerator comprising a door opening device and / or the clutch.

[0022] The embodiments of the present application have at least the following beneficial effects:

[0023] The clutch, automatic door opening device and refrigerator provided by the embodiments of the present application comprise a first connecting piece, a second connecting piece and a rolling piece. The first connecting piece and the second connecting piece are rotationally matched. The first connecting piece is provided with an assembly cavity, and a limiting groove is formed in the inner wall of the assembly cavity. The rolling piece and the actuating arm of the second connecting piece are arranged in the assembly cavity of the first connecting piece, and the rolling piece is arranged to roll between the actuating arm and the inner wall of the assembly cavity. When the second connecting piece and the first connecting piece are relatively rotated, the rolling piece is embedded in the limiting groove under the action of the first connecting piece and the second connecting piece, and abuts against the actuating arm, so as to block the continuous relative rotation of the first connecting piece and the second connecting piece, thereby realizing the synchronous rotation of the first connecting piece and the second connecting piece in the same direction, forming an integral whole in the rotation direction, and achieving a closed state. Thus, in the case of connecting the clutch to two action bodies upstream and downstream, stable transmission is realized. On the other hand, the entire clutch realizes closure by the relative rotation of the two connecting pieces, so that an additional clutch driving structure does not need to be arranged, the structural complexity and scale of the clutch are reduced to a certain extent, and the clutch control operation is simplified. The embedding process of the rolling piece into the limiting groove is a gradual process, that is, after the relative rotation of the two connecting pieces, the rolling piece is rolled into the limiting groove under the joint action of the two connecting pieces. Therefore, when the first connecting piece and the second connecting piece are driven, there is a certain buffer time, so that when one of the two action bodies upstream and downstream is started or impacted, the other one is not caused to be instantaneously impacted, the stability of each functional structure on the transmission path is greatly improved, and the risk of impact damage is reduced. BRIEF DESCRIPTION OF DRAWINGS

[0024] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed in the embodiment description will be briefly introduced. Obviously, the drawings in the following description are some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor.

[0025] Figure 1 An exploded view of the clutch in the embodiments of the present application is shown;

[0026] Figure 2 An assembly state schematic view of the clutch in Figure 1 is shown;

[0027] Figure 3 A top view of the clutch in Figure 2 is shown;

[0028] Figure 4 A top view of the first connecting piece of the clutch in Figure 2 is shown;

[0029] Figure 5 is shownFigure 2 Assembled state of the second connecting piece and the magnetic piece in the clutch in

[0030] Figure 6 The structure of the clutch in Figure 2 is shown.

[0031] Figure 7 The cross-sectional view of the clutch in Figure 6 is shown.

[0032] Figure 8 The structure of the automatic door opening device in the embodiment of the present application is shown.

[0033] Reference signs:

[0034] 1 - first connecting piece, 11 - assembled cavity, 111 - inner wall, 111a - limiting groove, 111b - circumferential inner wall, 111c - axial inner wall, 12 - first shaft body, 121 - positioning shaft;

[0035] 2 - second connecting piece, 21 - push arm, 211 - guide inclined surface, 22 - second shaft body, 221 - positioning groove;

[0036] 3 - rolling piece

[0037] 4 - magnetic piece;

[0038] 5 - shell, 51 - first shell, 52 - second shell;

[0039] 6 - motor, 61 - worm;

[0040] 7 - transmission assembly;

[0041] 8 - top door piece;

[0042] 9 - clutch;

[0043] 10 - device base. DETAILED DESCRIPTION

[0044] The technical solutions in the embodiments of the present application will be described clearly and completely below in combination with the drawings in the embodiments of the present application. Obviously, the described embodiments are only some of the embodiments of the present application, but not all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work fall within the scope of protection of the present application.

[0045] Moreover, the application can repeat reference numerals and / or reference letters in various examples for the sake of simplicity and clarity, and such repetition is not to imply a relationship between the various embodiments and / or aspects in which such numerals and / or letters are repeated. Furthermore, the application provides examples of various specific processes and materials, but one skilled in the art will recognize that other processes and / or materials can be used.

[0046] The application is described below in connection with the accompanying drawings and a specific embodiment:

[0047] In an electric appliance such as a refrigerator, an automatic door opening device is configured to automatically open a door body. The automatic door opening device includes a driving member, a door opening member, and a transmission mechanism connected between the two. When the driving member is started, the driving member is started instantaneously, which is likely to impact and damage the transmission mechanism; or under the influence of external factors, the door opening member is passively retracted, which is also likely to impact and damage the transmission mechanism and the driving member.

[0048] To this end, the embodiments of the application provide a clutch, an automatic door opening device, and a refrigerator, which aim to solve the technical problem that the transmission mechanism and the driving member of the automatic door opening device are likely to be impacted and damaged at the moment of starting or under the influence of external impact.

[0049] Figure 1 An exploded view of the structure of the clutch in the embodiments of the application is shown; Figure 2 An assembly state diagram of the clutch in Figure 1 is shown; Figure 3 A top view of the clutch in Figure 2 is shown; Figure 4 A top view of the first connecting member of the clutch in Figure 2 is shown; Figure 5 An assembly state diagram of the second connecting member and the magnetic member in the clutch in Figure 2 is shown; Figure 6 A structure diagram of the clutch in Figure 2 is shown; Figure 7 A sectional view of the clutch in Figure 6 is shown.

[0050] Referring to Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 , Figure 6 and Figure 7In some embodiments, a clutch is provided, which is connected to a transmission mechanism of an automatic door opening device, and is configured to control the disconnection or connection of the transmission path of the automatic door opening device by switching between the disconnected state and the connected state of the clutch, so as to increase the impact resistance of the driving member and the transmission mechanism to a certain extent, and to maintain the reliability of the function of the device structure.

[0051] The clutch comprises a first connecting member 1, a second connecting member 2, and a rolling member 3. The first connecting member 1 and the second connecting member 2 are rotationally connected, the first connecting member 1 is provided with an assembly cavity 11, a limiting groove 111a is formed in the inner wall 111 of the assembly cavity 11, the second connecting member 2 is provided with a push arm 21, the push arm 21 and the rolling member 3 are arranged in the assembly cavity 12, and the rolling member 3 is arranged between the push arm 21 and the inner wall 111 of the assembly cavity 11. When the first connecting member 1 and the second connecting member 2 rotate relative to each other, the push arm 21 and / or the inner wall 111 guide the rolling member 3 into the limiting groove 111a, and the rolling member 3 is kept in abutment with the push arm 21, so as to block the further rotation of the first connecting member 1 and the second connecting member 2, and enable the rotation of the first connecting member 1 and the second connecting member 2, thereby transmitting the driving torque.

[0052] When the clutch is connected to the transmission structure, one of the first connecting member 1 and the second connecting member 2 is a driving member, and the other is a driven member, and is connected with the upstream and downstream assemblies respectively, so that when the upstream or downstream assembly operates, the first connecting member 1 or the second connecting member 2 will follow the rotation. When the first connecting member 1 and the second connecting member 2 rotate relative to each other by a certain angle, the rolling member 3 is embedded and stays in the limiting groove 111a, which blocks the further rotation of the push arm 21, so that the first connecting member 1 and the second connecting member 2 are relatively stationary, and are locked as a whole with consistent rotation, i.e., the clutch is closed, thereby transmitting the driving torque.

[0053] It is worth noting that since the clutch is closed only after the first connecting member 1 and the second connecting member 2 rotate for a period of time, the transmission mechanism in which the clutch is located is still disconnected at the moment when the upstream or downstream assembly operates, and the entire transmission mechanism and device will not be immediately put into operation, only part of the assembly will follow the operation, so that the transmission load and resistance are greatly reduced compared to the entire transmission mechanism and device, and the risk of impact damage is relatively lower. On the other hand, since part of the assembly connected with one of the first connecting member 1 and the second connecting member 2 follows the operation, it can also consume part of the energy before the clutch is closed, so that the impact on each transmission member and driving member of the transmission mechanism and device is correspondingly reduced when the clutch is closed, and the risk and degree of damage at the moment of starting the device or being subjected to external impact are also reduced to a certain extent.

[0054] The following will take the automatic door opening device connected to the clutch as an example to illustrate the technical scheme of the clutch.

[0055] The first connecting member 1 can be connected to the rotating shaft of the driving motor, and the second connecting member 2 is connected to the downstream transmission mechanism. At the moment when the driving motor starts, the first connecting member 1 rotates, and the second connecting member 2 remains in its original position. During the rotation of the first connecting member 1, the rolling member 3 slowly drives the push arm 21 to rotate and guides the rolling member 3 to enter and stay in the limiting groove 111a. At this time, the second connecting member 2 rotates at the same pace as the first connecting member 1, thereby realizing the closure of the clutch. At the moment when the driving motor starts, the entire transmission mechanism does not directly determine the action, but first drives the relative rotation of the first connecting member 1, slowly starts the second connecting member 2 in the process, and gradually closes the clutch, thereby consuming the transient impact energy at the starting moment, reducing the risk and degree of damage.

[0056] At the moment when the top door piece is in the extended state or is impacted by external force to retract and reset, the driving torque is transmitted to the second connecting member 2, the second connecting member 2 reverses, the push arm 21 releases the push state of the rolling member 3, thereby releasing the closed state of the clutch, until the push arm 21 reverses with the second connecting member 2, and in the process, the push arm 21 moves and slowly guides the rolling member 3 to enter and stay in the limiting groove 111a. At this time, the first connecting member 1 reverses at the same pace as the second connecting member 2, and then realizes the closure of the clutch again. During the reverse rotation of the second connecting member 2 and the pushing of the rolling member 3, part of the transient impact energy at the impact moment can be consumed, the rotation speed of the second connecting member 2 is reduced, and the risk and degree of damage are reduced.

[0057] It is worth noting that the second connecting member 2 can also be used as the driving end, which is driven by the upstream driving member to rotate, and then enters the limiting groove 111a to realize the closure of the clutch.

[0058] In some embodiments, considering the functionality of the clutch as a safety component, the standby state of the clutch can be set to the open state, so as to stably protect the transmission mechanism and the driving member at the moment when the device starts. The rolling member 3 is located between the push arm 21 and the inner wall 111 of the assembly cavity 11. After the push arm 21 is displaced and the pushing force of the rolling member 3 is released, the rolling member 3 will be affected by factors such as gravity and vibration, and will adaptively roll away from the limiting groove 111a, so that the clutch is opened.

[0059] In order to ensure that the normal state of the clutch is the disengaged state, the normal position of the rolling element 3 can be set to the state of disengaging from the limiting groove 111a. To this end, a stable force or structure can be formed in the clutch to guide the rolling element 3 to disengage from the limiting groove 111a, but when the clutch needs to be closed, the rolling element 3 can be guided into and retained in the limiting groove 111a by rotating the push arm 21.

[0060] Specifically, the clutch can further include a magnetic element 4 located at least partially in the assembly cavity 11 and maintaining a magnetic force between the magnetic element 4 and the rolling element 3, and the magnetic force exerted by the magnetic element 4 on the rolling element 3 is a magnetic force in the direction of urging the rolling element 3 to disengage from the limiting groove 111a, so that the rolling element 3 is always subjected to the magnetic force of disengaging from the limiting groove 111a exerted by the magnetic element 4.

[0061] In order to realize the closing of the clutch, the magnetic force exerted by the magnetic element 4 on the rolling element 3 is obviously smaller than the pushing force exerted on the rolling element 3 during the rotation of the push arm 21.

[0062] After the push arm 21 releases the pushing of the rolling element 3, the rolling element 3 will be affected by the magnetic force to approach or be attracted to the magnetic element 4, maintaining the state of disengaging from the limiting groove 111a, thereby maintaining the clutch in the disengaged state.

[0063] In some embodiments, in order to maintain the continuous magnetic force between the rolling element 3 and the magnetic element 4, one of the rolling element 3 and the magnetic element 4 is a magnetic material, the other is a magnetic metal that can be attracted to the magnetic material, or both the rolling element 3 and the magnetic element 4 can be magnetic materials.

[0064] It is worth noting that based on the principle of magnetic force between a magnet and a magnetic metal, when the magnetic metal is in the magnetic field of the magnet, the electron distribution in the magnetic metal will change, so that the magnetic metal becomes a magnetic element with a certain magnetism, and therefore the magnetic element 4 can also be a magnetic metal in the magnetic field of a magnetic material.

[0065] In some embodiments, in order to improve the stability of the closing operation of the clutch, the relative positions of the push arm 21, the rolling element 3 and the magnetic element 4 in the assembly cavity 11 can be planned so that the operation of the push arm 21 to push the rolling element 3 into the limiting groove 111a is stable and efficient.

[0066] To this end, the limiting groove 111a can be formed on the circumferential inner wall 111b of the assembly cavity 11, and the rolling member 3 and the push arm 21 are arranged between the axial inner wall 111c of the assembly cavity 11 and the magnetic member 4. That is, the assembly cavity 11 is regionally planned according to the axial side and the circumferential side, that is, the inner wall of the assembly cavity 11 is divided into the circumferential inner wall 111b and the axial inner wall 111c. Since the first connecting member 1 is a rotating member, it should have a rotating shaft, and therefore the circumferential inner wall 111b is the inner wall in the rotating circumferential direction of the first connecting member 1, and the axial inner wall 111c is the inner wall in the axial direction of the first connecting member 1.

[0067] When the first connecting member 1 rotates, the rolling member 3 will move along the circumferential inner wall 111b and stably enter the limiting groove 111a. Correspondingly, the rolling member 3 and the push arm 21 will be clamped between the axial inner wall 111c and the magnetic member 4, thereby limiting the amplitude of the rolling member 3 moving in the axial direction, and ensuring that the rolling member 3 stably enters the limiting groove 111a.

[0068] Generally, in the axial direction of the assembly cavity 11, the distance between the axial inner wall 111c and the magnetic member 4 can be configured to be slightly larger than the diameter of the rolling member 3 and the height of the push arm 21, so that the rolling member 3 can be stably arranged in the side region of the push arm 21, and when the push arm 21 rotates, the rolling member 3 can be stably pushed and guided to be embedded and reside in the limiting groove 111a.

[0069] In some embodiments, a resilient member such as a spring can also be arranged in the limiting groove 111a, and when the rolling member 3 enters the limiting groove 111a, the spring and other resilient members will be compressed, so that the resilient member generates a restoring force for pushing the rolling member 3 out of the limiting groove 111a to contact the closed state of the clutch.

[0070] During the stable rotation of the push arm 21, the push arm 21 can push the rolling member 3 into the limiting groove 111a, which can offset the restoring force of the resilient member to maintain the closed state of the clutch. When the push arm 21 stops or slows down, the pressure applied by the push arm 21 to the rolling member 3 gradually decreases, and when the restoring force of the resilient member is greater than the pushing force of the push arm 21, the rolling member 3 can be pushed out of the limiting groove 111a by the resilient member, and the clutch is turned off.

[0071] In some embodiments, the inner cavity of the assembly cavity 11 can be configured as a cylindrical inner cavity coaxially arranged with the first connecting member 1.

[0072] In some embodiments, since the first connecting member 1 and the second connecting member 2 are rotating members, in order to facilitate the connection of external devices, the first connecting member 1 can include a first shaft body 12, the assembly cavity 11 can be arranged at one side of the shaft end of the first shaft body 12, and the second connecting member 2 can include a second shaft body 22, and the push arm 21 is arranged on the peripheral surface of the second shaft body 22.

[0073] That is, a fitting cavity 11 is formed in the shaft end of the first shaft body 12, and the second shaft body 22 is embedded in the fitting cavity in the axial direction, so that the first shaft body 12 and the second shaft 22 can be rotatably matched, and the actuating arm 21 can rotate with the second shaft body 22.

[0074] In some embodiments, the first shaft body 12 and the second shaft body 22 can be coaxially arranged to achieve coaxial transmission. In order to ensure coaxiality, one of the shaft end faces of the first shaft body 12 and the shaft end face of the second shaft body 22 can be provided with a positioning groove 221, and the other can be provided with a positioning shaft 121, which is rotatably embedded in the positioning groove 221, and the positioning shaft 121, the positioning groove 221, the first shaft body 12 and the second shaft body 22 are coaxially arranged.

[0075] In some embodiments, the actuating arm 21 can be arranged at the end of the end of the second shaft body 22 located in the fitting cavity 11, close to the one side axial side wall 111c of the fitting cavity 11, so as to compress the actuating arm 21 and the rolling member 3 to the space of the axial inner wall 111c and the magnetic member 4, which can reduce the overall size of the clutch to some extent, and facilitate the application of the clutch.

[0076] In some embodiments, the position of the magnetic member 4 should be maintained stable in the fitting cavity 11, so as to help ensure the stability of the magnetic force received by the rolling member 3. The magnetic member 4 can be sleeved on the second shaft 22, so that the radial position of the magnetic member 4 is kept stable by the positioning structure of the second shaft 22, and the radial magnetic force is kept stable.

[0077] In some embodiments, the diameter of the magnetic member 4 can be smaller than the inner diameter of the inner cavity of the fitting cavity 11, that is, the edge of the magnetic member 4 is kept a certain distance from the circumferential inner wall 111b, so as to avoid the case that the rolling member 3 embedded in the limiting groove 111a is also magnetically attached to the magnetic member 4, so as to stably guide the rolling member 3 away from the limiting groove 111a, and ensure the stability and reliability of the disengaged state of the clutch.

[0078] At the same time, the gap between the edge of the magnetic member 4 and the groove bottom of the limiting groove 111a is smaller than the diameter of the rolling member 3, so as to avoid the rolling member 3 from escaping from the fitting cavity 11.

[0079] In some embodiments, in order to avoid the first connecting member 1 and the second connecting member 2 from escaping in the axial direction, the clutch can further include a housing 5 for at least blocking the end sides of the first connecting member 1 and the second connecting member 2 away from each other in the axial direction, stopping the axial movement of the first connecting member 1 and the second connecting member 2, and keeping the axial matching position of the first connecting member 1 and the second connecting member 2 stable.

[0080] In order to avoid the interference of the shell 5 with the rotation of the first connecting member 1 and the second connecting member 2, at least one of the first shaft body 12 and the second shaft body 22 is rotationally matched with the shell 5. That is, the shell 5 is rotationally matched with the first shaft body 12 and the second shaft body 22, or the shell 5 is rotationally matched with the first shaft body 12 or the second shaft body 22.

[0081] In some embodiments, in order to facilitate assembly, the shell 5 can be provided in a split structure, that is, the shell includes a buckled first shell 51 and a second shell 52, the first shaft body 12 is rotationally arranged in the shaft hole of the first shell 51, and the second shaft body 22 is rotationally arranged in the shaft hole of the second shell 52.

[0082] In some embodiments, the first shell 51 and the second shell 52 can be fixed in a threaded sleeve manner or in a buckle buckling sleeve manner.

[0083] In some embodiments, the shell 5 can be a sealed cylindrical member, so as to avoid the entry of sundries into the clutch.

[0084] In some embodiments, when the toggle arm 21 rotates and pushes the rolling member 3, the rolling member 3 is moved along the side wall of the toggle arm 21 under the action of centrifugal force, and the side surface of the toggle arm 21 in contact with the rolling member 3 can be provided as a guide inclined surface 211 to guide the rolling member 3 to move away from the rotation axis of the toggle arm 21 and close to the limiting groove 111a when the toggle arm 21 pushes the rolling member 3.

[0085] Generally, the two side guide inclined surfaces of the toggle arm 21 form an elliptical or shuttle shape to reduce the overall volume and take into account the smoothness of the guide to the rolling member 3 to guide the rolling member 3 to stably enter the limiting groove 111a.

[0086] In some embodiments, in order to improve the closing response efficiency of the clutch, the number of limiting grooves 111a can be provided as multiple, and the multiple limiting grooves 111a are arranged on the inner wall 111 of the assembly cavity 11 in the rotation direction of the toggle arm 21; so as to improve the efficiency of the rolling member 3 entering the limiting groove 111a when the toggle arm 21 rotates.

[0087] Generally, the multiple limiting grooves 111a can be arranged on the circumferential inner wall 111b at equal intervals in the circumferential direction of the first shaft body 12.

[0088] In some embodiments, the number of toggle arms 21 can also be multiple, and the multiple toggle arms 21 are arranged at equal intervals in the circumferential direction of the rotation axis of the toggle arm 21, and correspondingly, the number of rolling members 3 is also multiple, and at least one rolling member 3 is arranged between any two adjacent toggle arms 21, so as to improve the efficiency of the rolling member 3 entering the limiting groove 111a when the toggle arm 21 rotates.

[0089] In some embodiments, the number of the toggle arms 21 is two, which are symmetrically arranged on both sides of the second shaft 22, and the corresponding rolling members are two, which are arranged on both sides of the toggle arms 21 respectively, so that the stress of the first connecting member 2 can be balanced.

[0090] Figure 8 The structure schematic diagram of the automatic door opening device in the embodiments of the present application is shown, referring to Figure 8 In some embodiments, an automatic door opening device is also provided, which comprises a motor 6, a transmission assembly 7, a top door member 8 and a clutch 9; the motor 6 is in transmission connection with the top door member 8 through the transmission assembly 7, and the clutch 9 can be connected between two stage transmission members of the transmission assembly 7, or the clutch is connected between the output shaft of the motor 6 and the transmission assembly.

[0091] In some embodiments, the transmission assembly 7 can adopt a multi-stage gear transmission assembly, the first shaft body 22 of the first connecting member 1 of the clutch 9 is connected with a worm 61, the second connecting member 2 is connected with the output shaft of the motor 6, the worm 61 is engaged with the transmission assembly 7, and the top door member 8 is movably arranged on a device base 10.

[0092] In some embodiments, a refrigerator comprising the above clutch or the automatic door opening device is also provided.

[0093] The embodiments of the present application have at least the following beneficial effects:

[0094] The clutch, the automatic door opening device and the refrigerator provided by the embodiments of the present application comprise a first connecting piece, a second connecting piece and a rolling piece; the first connecting piece and the second connecting piece are rotationally matched; the first connecting piece is provided with an assembly cavity, and a limiting groove is formed in the inner wall of the assembly cavity; the rolling piece and the actuating arm of the second connecting piece are arranged in the assembly cavity of the first connecting piece, and the rolling piece is arranged to roll between the actuating arm and the inner wall of the assembly cavity; when the second connecting piece and the first connecting piece rotate relative to each other, the rolling piece is embedded in the limiting groove under the action of the first connecting piece and the second connecting piece, and abuts against the actuating arm, so as to block the continuous relative rotation of the first connecting piece and the second connecting piece, thereby realizing the synchronous rotation of the first connecting piece and the second connecting piece in the same direction, forming an integral whole in the rotation direction, and achieving a closed state, so that stable transmission is realized in the case that the clutch is connected between two action bodies upstream and downstream. On the other hand, the entire clutch realizes closing through the relative rotation of the two connecting pieces, so that an additional clutch driving structure does not need to be arranged, the structural complexity and scale of the clutch are reduced to a certain extent, and the clutch control operation is simplified; wherein the embedding process of the rolling piece into the limiting groove is a gradual process, that is, after the relative rotation of the two connecting pieces, the rolling piece is rolled into the limiting groove under the joint action of the two connecting pieces, so that when the first connecting piece and the second connecting piece are driven, there is a certain buffer time, so that when one of the two action bodies upstream and downstream is started or is impacted, the other one is not caused to be instantaneously impacted, the stability of each functional structure on the transmission path is greatly improved, and the risk of impact damage is reduced.

[0095] In the present application, unless specifically defined and limited otherwise, the first feature is "on" or "under" the second feature, which can include that the first and second features are in direct contact, or that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, the first feature "on", "above" and "over" the second feature includes that the first feature is directly above and obliquely above the second feature, or only indicates that the horizontal height of the first feature is higher than that of the second feature. The first feature "under", "below" and "underneath" the second feature includes that the first feature is directly below and obliquely below the second feature, or only indicates that the horizontal height of the first feature is less than that of the second feature.

[0096] In the description of the present application, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise" indicate the orientation or positional relationship shown in the drawings, which is only for the convenience of describing the present application and simplifying the description, and does not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application.

[0097] 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.

[0098] 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.

[0099] 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.

[0100] 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.

[0101] 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.

[0102] 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. A clutch, characterized by The clutch comprises: a first connecting member provided with an assembly cavity, and a limiting groove is formed on the inner wall of the assembly cavity; a second connecting member rotationally connected with the first connecting member, and the second connecting member is provided with a pushing arm rotationally arranged in the assembly cavity; a rolling member arranged between the pushing arm and the inner wall of the assembly cavity, so that when the second connecting member and the first connecting member rotate relative to each other, the rolling member is embedded in the limiting groove and abuts against the pushing arm, so that the second connecting member and the first connecting member rotate in the same direction.

2. The clutch of claim 1, wherein, The clutch further comprises a magnetic member at least partially located in the assembly cavity, so as to apply a magnetic force to the rolling member in a direction away from the limiting groove, and when the pushing arm rotates, the magnetic force is smaller than the pushing force applied by the pushing arm to the rolling member.

3. The clutch of claim 2, wherein, The limiting groove is formed on the circumferential inner wall of the assembly cavity, and the rolling member and the pushing arm are arranged between the axial inner wall of the assembly cavity and the magnetic member.

4. The clutch of claim 1, wherein, The first connecting member comprises a first shaft body, the second connecting member comprises a second shaft body, the second shaft body is coaxially arranged with the first shaft body, the assembly cavity is arranged at the axial end of the first shaft body, and the pushing arm is arranged on the peripheral surface of the second shaft body.

5. The clutch of claim 4 wherein, One of the axial end faces of the first shaft body and the second shaft body is provided with a positioning groove, and the other is provided with a positioning shaft rotationally embedded in the positioning groove, and the positioning groove, the positioning shaft, the second shaft body and the first shaft body are coaxially arranged.

6. The clutch of claim 4 wherein, The clutch further comprises a housing at least arranged on the end sides of the first connecting member and the second connecting member away from each other in the axial direction, and at least one of the first shaft body and the second shaft body is rotationally connected with the housing.

7. The clutch of claim 6 wherein, The housing comprises a buckled first housing and a second housing, the first shaft body is rotationally arranged in the shaft hole of the first housing, and the second shaft body is rotationally arranged in the shaft hole of the second housing.

8. The clutch of claim 1, wherein, The side surface of the pushing arm in contact with the rolling member is provided with a guide inclined surface, so as to guide the rolling member to move away from the rotation shaft of the pushing arm when the pushing arm pushes the rolling member.

9. A clutch as claimed in any one of claims 1 to 8 wherein, The limiting groove is a plurality of limiting grooves, and the plurality of limiting grooves are arranged on the inner wall of the assembly cavity in the rotation direction of the pushing arm. The pushing arm is a plurality of pushing arms, and the plurality of pushing arms are equally spaced around the circumference of the rotation shaft of the pushing arm.

10. An automatic door opening device characterized by comprising: The clutch comprises a motor, a transmission assembly, a top door member and the clutch according to any one of claims 1-9. The clutch is connected between the output shaft of the motor and the transmission assembly, the transmission assembly is connected with the top door member. Alternatively, the clutch is arranged in the transmission assembly.

11. A refrigerator characterized by comprising: The door opening device in claim 10 and / or the clutch according to any one of claims 1-9.

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