Automatic door lock structure with positive and negative rotation clutch function

Abstract

An automatic door lock structure with a forward and reverse rotation clutch function comprises a shell of a door lock, a lock catch is installed in the shell, a rack is installed on the rear side of the lock catch, a motor is further installed in the shell, multiple stages of transmission wheels are installed between an output shaft of the motor and the rack, one transmission wheel in the multiple stages of transmission wheels is a clutch wheel, and the other transmission wheel in the multiple stages of transmission wheels is a clutch wheel. The clutch wheel comprises a wheel shaft, an upper clutch wheel body and a lower clutch wheel body, the upper clutch wheel body and the lower clutch wheel body are arranged on the wheel shaft in a sleeving mode, the wheel shaft and the upper clutch wheel body are circumferentially fixed to transmit motion and torque, the wheel shaft and the lower clutch wheel body transmit motion and torque through static friction force, and when the torque force is larger than the maximum static friction force, the lower clutch wheel body and the wheel shaft are not synchronous. The clutch device is mainly used for the dish-washing machine, clutch can be achieved when the motor rotates forwards and backwards, when the door is closed, if foreign matter blocks the door and the wheel shaft and the lower clutch wheel are not synchronous, the door plate cannot press obstacles continuously, and the mechanical hand clamping prevention effect is achieved; after accidental power failure, the door plate can be directly pushed by hands to close the door, the structure is simple, safety and reliability are achieved, and the service life of the motor can be prolonged.

Description

Technical Field

[0001] The utility model relates to an automatic door lock structure, in particular to an automatic door lock structure for a dishwasher with forward and reverse clutch functions. Background Art

[0002] If a foreign object blocks the automatic door lock when closing or opening the dishwasher, it could clamp the object or damage the door panel. This also increases the load on the motor, making it prone to burnout. Therefore, a clutch function is needed for the automatic door lock.

[0003] The patent office published on January 10, 2020, a dishwasher with patent number 201911108503.X, which includes a sink, a door capable of opening and closing the opening at the top of the sink, a dishwashing basket, a spray device capable of spraying water into the dishwashing basket to clean dishes, one side of the door hinged to one side of the sink, and a lock hook on the other side of the door, which is connected to the other side of the sink through an electric door lock, and the electric door lock has a clutch capable of driving the drive shaft to disengage from the output shaft; when a power outage occurs during the dishwashing process, the clutch can be used to drive the drive shaft to disengage from the output shaft, and then the drive shaft can be manually rotated to disengage the above-mentioned lock hook and lock catch, so that the door can be opened to prevent unwashed dishes and dirty water from being trapped in the sink. This clutch needs to be manually operated, first driving the drive shaft to disengage from the output shaft through the clutch, and then manually rotating the drive shaft to disengage the above-mentioned lock hook and lock catch, which is very cumbersome to operate. Summary of the Invention

[0004] The purpose of the utility model is to provide a dishwasher automatic door lock structure with forward and reverse clutch function to address the defects and shortcomings of the above-mentioned prior art.

[0005] To achieve the above-mentioned purpose, the technical solution adopted by the present invention is as follows: the automatic door lock structure with forward and reverse clutch function includes a door lock housing, a lock catch is installed in the housing, a rack is installed on the rear side of the lock catch, a motor is also installed in the housing, a multi-stage transmission wheel is installed between the output shaft of the motor and the rack, one of the transmission wheels of the multi-stage transmission wheel is a clutch wheel, the clutch wheel includes a wheel shaft and an upper clutch wheel and a lower clutch wheel mounted on the wheel shaft, the upper clutch wheel is directly or indirectly linked to the output shaft of the motor, and the lower clutch wheel is directly or indirectly linked to the rack; the wheel shaft and the upper clutch wheel are circumferentially fixed to transmit motion and torque, a convex ring or a concave ring is provided on the wheel shaft, and the lower clutch wheel is directly molded on the outer side of the convex ring or concave ring of the wheel shaft by secondary injection molding, and motion and torque are transmitted between the wheel shaft and the lower clutch wheel through static friction. When the torque force is greater than the maximum static friction force, the lower clutch wheel is out of synchronization with the wheel shaft.

[0006] There are two convex rings or concave rings, and the lower clutch wheel is located outside the two convex rings or concave rings.

[0007] By changing the thickness and depth of the convex ring and the concave ring, the maximum static friction force between the lower clutch wheel and the wheel shaft can be adjusted.

[0008] The upper and lower ends of the wheel shaft are movably inserted into the top plate and bottom plate of the shell.

[0009] The upper end of the wheel axle is partially a square shaft, and a square hole is opened in the center of the upper clutch wheel. The square hole of the upper clutch wheel is sleeved on the square shaft of the wheel axle to achieve circumferential fixation.

[0010] The upper clutch wheel is key-connected to the wheel shaft to achieve circumferential fixation.

[0011] The utility model is mainly used for dishwashers. The motor can automatically achieve clutching in both forward and reverse rotations. When closing the door, if there is a foreign object blocking it, the torque between the wheel axle and the lower clutch wheel will increase. After the torque exceeds the maximum static friction, the wheel axle and the lower clutch wheel will be out of sync, and the door panel will no longer press on the obstacle, thus playing a role in mechanical finger prevention. After an unexpected power outage, the door panel can also be closed by directly pushing the door panel by hand. As long as the torque exceeds the maximum static friction, the wheel axle and the lower clutch wheel will be out of sync, and the door panel can be closed. It has the advantages of simple structure, safety and reliability, and can also extend the service life of the motor. This clutch structure is superior to a plastic pawl structure. Since the pawl structure relies entirely on the elasticity of the plastic to achieve clutching, the pawl is prone to breakage after the plastic ages, and may not last after 3 to 5 years of use. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 It is a structural diagram of the present utility model.

[0013] Figure 2 This is a schematic diagram of the structure of the utility model after removing the upper cover of the shell.

[0014] Figure 3 This is a structural sectional view of the clutch wheel position of the utility model.

[0015] Figure 4 This is a schematic diagram of the wheel axle and lower clutch wheel structure of the utility model.

[0016] Figure 5 This is a cross-sectional view of the wheel axle and lower clutch wheel structure of the utility model. DETAILED DESCRIPTION

[0017] like Figure 1 、 Figure 2As shown, the present invention is an automatic door lock structure with forward and reverse clutch functions, primarily for use with dishwashers and other electrical appliances. It comprises a door lock housing 3, within which is mounted a latch 2. A rack 4 is mounted to the rear of the latch 2. When the latch 2 is inserted into a lock slot in a door panel, the rack 4 moves, driving the door panel. A motor 5 is also mounted within the housing 3, with a multi-stage drive wheel 1 mounted between the motor 5's output shaft and the rack 4. Rotation of the motor 5 enables automatic door opening and closing.

[0018] One of the transmission wheels in the multi-stage transmission wheel 1 is a clutch wheel 10. The clutch wheel 10 includes an axle 11 and an upper clutch wheel 12 and a lower clutch wheel 13 that are mounted on the axle 11. The upper and lower ends of the axle 11 are movably mounted on the top and bottom plates of the housing 3. The upper clutch wheel 12 is directly or indirectly linked to the output shaft of the motor 5. The axle 11 and the upper clutch wheel 12 are circumferentially fixed to transmit motion and torque, so that the motor 5 can directly drive the upper clutch wheel 12 and the axle 11 to rotate synchronously. The upper end of the axle 11 is partially formed into a square shaft 112. The center of the upper clutch wheel 12 is provided with a square hole. The square hole of the upper clutch wheel 12 is mounted on the square shaft 112 of the axle 11 to achieve circumferential fixation. The upper clutch wheel 12 can also be keyed to the axle 11 to achieve circumferential fixation.

[0019] like Figure 3 、 Figure 4 、 Figure 5 As shown, the lower clutch wheel 13 is directly or indirectly linked to the rack 4. The axle 11 is provided with a convex ring 111 or a concave ring. The lower clutch wheel 13 is directly molded outside the convex ring 111 or concave ring of the axle 11 through secondary injection molding. Motion and torque are transmitted between the axle 11 and the lower clutch wheel 13 through static friction. When the torque exceeds the maximum static friction, the lower clutch wheel 13 and the axle 11 become asynchronous. Therefore, the door panel can open and close asynchronously with the motor 5, and the motor 5 can automatically engage and disengage regardless of forward or reverse rotation.

[0020] Two convex rings 111 or concave rings are provided, and the lower clutch wheel 13 is directly molded on the outside of the two convex rings 111 or concave rings through secondary injection molding. The thickness and depth of the convex rings 111 and concave rings can be changed to adjust the maximum static friction between the lower clutch wheel 13 and the wheel shaft 11.

[0021] The present invention is mainly used for dishwashers. The motor 5 can automatically achieve clutching in both forward and reverse rotations. When closing the door, if there is a foreign object blocking it, the torque between the axle 11 and the lower clutch wheel 13 will increase. After the torque exceeds the maximum static friction, the axle 11 and the lower clutch wheel 13 will become out of sync, and the door panel will no longer press against the obstacle, thus playing a role in mechanical finger prevention. After an unexpected power outage, the door panel can also be closed by directly pushing the door panel by hand. As long as the torque exceeds the maximum static friction, the axle 11 and the lower clutch wheel 13 will become out of sync, and the door panel can be closed. It has the advantages of simple structure, safety and reliability, and can also extend the service life of the motor 5. This clutch structure is superior to a plastic pawl structure. Since the pawl structure relies entirely on the elasticity of the plastic to achieve clutching, the pawl is prone to breakage after the plastic ages, and may not last after 3 to 5 years.

Claims

1. An automatic door lock structure with forward and reverse clutch function, which includes a door lock housing, a lock catch installed in the housing, a rack installed on the rear side of the lock catch, a motor installed in the housing, and a multi-stage transmission wheel installed between the output shaft of the motor and the rack, characterized in that One of the multi-stage transmission wheels is a clutch wheel, which includes an axle and an upper clutch wheel and a lower clutch wheel mounted on the axle. The upper clutch wheel is directly or indirectly linked to the output shaft of the motor, and the lower clutch wheel is directly or indirectly linked to the rack. The axle and the upper clutch wheel are circumferentially fixed to transmit motion and torque. A convex ring or a concave ring is provided on the axle, and the lower clutch wheel is directly molded on the outside of the convex ring or the concave ring of the axle by secondary injection molding. Motion and torque are transmitted between the axle and the lower clutch wheel through static friction. When the torque force is greater than the maximum static friction force, the lower clutch wheel is out of synchronization with the axle.

2. The automatic door lock structure with forward and reverse clutch function according to claim 1 is characterized in that There are two convex rings or concave rings, and the lower clutch wheel is located outside the two convex rings or concave rings.

3. The automatic door lock structure with forward and reverse clutch function according to claim 1 is characterized in that By changing the thickness and depth of the convex ring and the concave ring, the maximum static friction force between the lower clutch wheel and the wheel shaft can be adjusted.

4. The automatic door lock structure with forward and reverse clutch function according to claim 1 is characterized in that The upper and lower ends of the wheel shaft are movably inserted into the top plate and bottom plate of the shell.

5. An automatic door lock structure with forward and reverse clutch function according to any one of claims 1 to 4, characterized in that The upper end of the wheel axle is partially a square shaft, and a square hole is opened in the center of the upper clutch wheel. The square hole of the upper clutch wheel is sleeved on the square shaft of the wheel axle to achieve circumferential fixation.

6. An automatic door lock structure with forward and reverse clutch function according to any one of claims 1 to 4, characterized in that The upper clutch wheel is key-connected to the wheel shaft to achieve circumferential fixation.

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