CN217814646U - Overload protection mechanism and speed reducing motor with same - Google Patents

Abstract

The application discloses an overload protection mechanism and a speed reducing motor with the same, wherein the overload protection mechanism comprises a transmission component, a flat gasket, a disc-shaped gasket and a rotating shaft; the transmission part is provided with a first through hole which is a circular through hole; the flat gasket is provided with a second through hole which is non-circular; the disc-shaped gasket is provided with a third through hole which is a circular through hole; the rotating shaft comprises an expanding part, a clamping part and a transmission part, and the transmission part is provided with a pressing part; the flat gasket is sleeved on the clamping portion, the clamping portion and the transmission component are sleeved on the transmission portion, the shape of the transmission portion is matched with the first through hole and the third through hole, the flat gasket is extruded and installed between the diameter expanding portion and the transmission component, the peripheral portion of the dish-shaped gasket is abutted to one side, far away from the flat gasket, of the transmission component, and the middle portion of the dish-shaped gasket is abutted to the middle portion of the dish-shaped gasket and pressed on the pressing portion. This application can alleviate the noise when operation when realizing overload protection to can also improve the yields of the product that has this overload protection mechanism.

Description

Overload protection mechanism and geared motor with same

technical field

The present application relates to the technical field of mechanical overload protection, in particular to an overload protection mechanism using friction force and a geared motor with the same.

Background technique

In the related art, there is an overload protection mechanism, which includes a rotating shaft, a gear and two compression washers, wherein the rotating shaft is used to output power, and the two pressing washers and gears are arranged on the rotating shaft, and the two Two compression washers are located on both axial sides of the gear, wherein the rotating shaft is provided with an enlarged diameter part to abut against the first compression washer, and a deformation part is provided to abut against and deform the second compression washer, To press the gear between the two compression pads, in order to make the two compression pads rotate with the rotating shaft, the centers of the two compression pads are provided with non-circular engaging holes , such as a double D-shaped hole whose edge is composed of two opposite arcs and two opposite line segments, etc., the part where the rotating shaft passes through the two compression washers and the gear is set so that the cross section matches the snap hole Snap-fit shape, a round hole is set in the center of the gear, and the part where the rotating shaft passes through the two compression washers and the gear has a cylindrical surface that matches the inner wall of the round hole, so that the gear can rotate freely relative to the rotating shaft; this overload Protection mechanism, the output torque of the rotating shaft is provided by the friction torque applied to the compression pad by the gear. When the load on the rotary shaft is too large and exceeds the maximum friction torque that the gear can apply to the compression pad, the gear will be able to The rotation of the rotating shaft achieves overload protection, thereby avoiding the tooth breakage of the gear or the partial burnout of the coil of the motor due to excessive load. Although this overload protection mechanism can achieve overload protection, because the gear is matched with the non-circular section of the rotating shaft through a round hole, there will be a cavity between the inner side of the gear and the rotating shaft, and the rotating shaft is working. The center will probably bear the lateral force perpendicular to the axial direction. As the rotating shaft rotates, the position of the cavity will also change periodically, which will make the contact force between the rotating shaft and the gear also change periodically, and then This makes the rotating shaft and the gear generate high vibration noise during the rotation process; and, since the part where the rotating shaft is connected to the compression gasket is an engaging shape that matches the engaging hole, and the deformation part is located at this position and is obtained by extrusion deformation , so the deformation part can only be formed on the arc-shaped cylindrical surface on both sides of the part, and the deformation part cannot abut and fix the second compression washer on the entire circle of the engaging hole, while the second compression washer The middle part of the compression gasket will have a large deformation at the position where it is pressed against the deformation part, and the deformation at other positions in the middle part is relatively small, that is, the deformation of the second compression gasket is uneven at its circumferential position, while the entire The maximum driving torque of the overload protection mechanism is highly related to the deformation of the second compression gasket, and the uneven deformation of the second compression gasket will cause fluctuations in the actual maximum driving torque and a large deviation from the design maximum driving torque , which in turn leads to a high defect rate in products such as motors with this overload protection mechanism.

Utility model content

This application aims to solve one of the technical problems existing in the prior art. For this reason, the embodiment of the first aspect of the present application proposes an overload protection mechanism, which can reduce noise during operation while achieving overload protection, and can also improve the yield of products equipped with the overload protection mechanism.

The embodiment of the second aspect of the application proposes a geared motor, which has the overload protection mechanism of the embodiment of the first aspect above.

The overload protection mechanism according to the embodiment of the first aspect of the present application includes a transmission part, a flat washer, a disc washer and a rotating shaft; a first through hole is provided in the middle of the transmission part, and the first through hole is a circular through hole; The middle part of the gasket is provided with a second through hole, and the second through hole is a non-circular anti-rotation hole; the middle part of the disc-shaped gasket is provided with a third through hole, and the third through hole is a circular through hole; the rotating shaft includes mutual Connecting the expanded diameter part, the engaging part and the transmission part, the transmission part is provided with an annular pressing part; wherein, the flat gasket is sleeved on the engaging part through the second through hole, and the engaging part and the second through hole The shape of the transmission part matches the shape of the first through hole, and the disc-shaped gasket is respectively sleeved on the transmission part through the third through hole. The shape of the transmission part matches the first through hole and the third through hole, and the flat gasket is It is squeezed and installed between the diameter-expanding part and the transmission part. The peripheral part of the disc-shaped gasket abuts against the side of the transmission part away from the flat gasket, and the middle part of the disc-shaped gasket abuts and is pressed against the pressing part.

The overload protection mechanism according to the embodiment of the first aspect of the present application has at least the following technical effects:

Since the pressing part is pressed on the disc-shaped gasket, and the disc-shaped gasket will be pressed on the transmission part, and the transmission part will press the flat gasket on the enlarged diameter part, so with the help of the transmission part and the flat washer And the friction between the disc-shaped gaskets, when the load moment on the rotating shaft is small, the transmission part will be able to drive the rotating shaft to rotate together, and when the load moment is greater than that between the transmission part and the flat gasket and the disc-shaped gasket When the maximum friction torque can be generated, the transmission part will rotate relative to the rotating shaft, thereby realizing overload protection; and, since the rotating shaft cooperates with the transmission part through the transmission part matching the shape of the first through hole, the transmission There will be no cavity between the component and the rotating shaft, and the contact force will not change periodically as the rotating shaft rotates due to the cavity, thereby improving the noise problem during the normal rotation of the rotating shaft; and , since the side of the transmission part is a cylindrical surface matching the shape of the first through hole and the third through hole, the contact area between the transmission part and the transmission part is also larger, and it is easier to ensure the contact between the transmission part and the rotating shaft Coaxiality, the output rotational torque will be more stable, and the products with this overload protection mechanism will also run more smoothly, which can further reduce noise; at the same time, the pressing part is a ring around the transmission part, so the disc gasket The circumferential direction of the middle part can be in contact with the pressing part, thereby making the deformation of the disc gasket more uniform in the circumferential direction, making it easier to control the maximum driving torque that the transmission part can transmit to the rotating shaft, and producing excellent overload protection. The maximum driving torque that the mechanism can achieve has a smaller fluctuation range and is closer to the design value, thereby improving the yield rate of products with the overload protection mechanism.

According to the overload protection mechanism of some embodiments of the first aspect of the present application, the side of the transmission part facing the flat gasket is provided with a first gasket installation groove, and the flat gasket is located in the first gasket installation groove and installed with the first gasket. The bottom of the groove fits snugly.

According to the overload protection mechanism of some embodiments of the first aspect of the present application, the side of the flat gasket close to the transmission part is provided with several convex points, and the bottom of the first gasket installation groove is provided with several concave points, and the convex points and the concave points When the size of the transmission part and the rotating shaft are co-rotated, the convex point is embedded in the concave point.

According to the overload protection mechanism of some embodiments of the first aspect of the present application, several convex points are evenly arranged on the side of the flat gasket close to the transmission part, and several concave points are evenly arranged on the groove bottom of the first gasket installation groove.

According to the overload protection mechanism of some embodiments of the first aspect of the present application, the number of concave points is more than the number of convex points.

According to the overload protection mechanism of some embodiments of the first aspect of the present application, the side of the transmission component facing the dish-shaped gasket is provided with a second gasket installation groove, and the disk-shaped gasket is arranged in the second gasket installation groove.

According to the overload protection mechanism of some embodiments of the first aspect of the present application, a ring of protrusions is provided on the outer edge of the second washer installation groove along the first through hole.

According to the overload protection mechanism of some embodiments of the first aspect of the present application, the output portion is formed at the end of the enlarged diameter portion away from the flat gasket, and a threaded hole is provided at the end of the output portion.

According to the overload protection mechanism of some embodiments of the first aspect of the present application, notches are provided on both sides of the output part.

The geared motor according to the embodiment of the second aspect of the present application includes the overload protection mechanism of the embodiment of the first aspect above.

According to the overload protection mechanism of the embodiment of the first aspect of the present application, at least the following technical effects are achieved: since the geared motor of this embodiment adopts the overload protection structure of the embodiment of the first aspect, the noise during operation is lower, and the produced The geared motor has better consistency of overload torque, so the yield rate is better.

Additional aspects and advantages of the application will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the application.

Description of drawings

The above and/or additional aspects and advantages of the present application will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, wherein:

Fig. 1 is a schematic structural diagram of an overload protection mechanism according to an embodiment of the present application;

Fig. 2 is a cross-sectional view of a first overload protection mechanism according to an embodiment of the present application;

FIG. 3 is a schematic diagram of an exploded structure of a first overload protection mechanism according to an embodiment of the present application;

4 is a cross-sectional view of a second overload protection mechanism according to an embodiment of the present application;

FIG. 5 is a schematic diagram of an exploded structure of a second overload protection mechanism according to an embodiment of the present application;

6 is a schematic structural view of a flat gasket in a second overload protection mechanism according to an embodiment of the present application;

Fig. 7 is a schematic structural diagram of a transmission component in a second overload protection mechanism according to an embodiment of the present application.

Reference signs:

Transmission part 100, first gasket installation groove 110, concave point 111, second gasket installation groove 120, protrusion 121, first through hole 130, flat gasket 200, second through hole 210, bump 220, dish-shaped The washer 300 , the third through hole 310 , the rotating shaft 400 , the engaging portion 411 , the transmission portion 412 , the enlarged diameter portion 420 , the threaded hole 421 , the notch 422 , and the pressing portion 430 .

Detailed ways

Embodiments of the present application are described in detail below, and examples of the embodiments are shown in the drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by referring to the figures are exemplary and are only for explaining the present application, and should not be construed as limiting the present application.

In the description of the present application, it should be understood that the orientation descriptions, such as up, down, front, back, left, right, etc. indicated orientations or positional relationships are based on the orientations or positional relationships shown in the drawings, and are only In order to facilitate the description of the present application and simplify the description, it does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as limiting the present application.

In the description of this application, if the first and second are described only for the purpose of distinguishing technical features, it cannot be understood as indicating or implying relative importance or implicitly indicating the number of indicated technical features or implicitly indicating The sequence of the indicated technical features.

In the description of this application, unless otherwise clearly defined, words such as setting, installation, and connection should be understood in a broad sense, and those skilled in the art can reasonably determine the specific meanings of the above words in this application in combination with the specific content of the technical solution.

The overload protection mechanism of the embodiment of the first aspect of the present application will be described below with reference to FIG. 1 to FIG. 7 .

As shown in FIGS. 1 to 7 , the overload protection mechanism according to the embodiment of the first aspect of the present application includes a transmission component 100 , a flat washer 200 , a disc-shaped washer 300 and a rotating shaft 400 .

A first through hole 130 is provided in the middle of the transmission part 100, and the first through hole 130 is a circular through hole; a second through hole 210 is provided in the middle of the flat gasket 200, and the second through hole 210 is a non-circular anti-rotation hole; A third through hole 310 is provided in the middle of the dish washer 300, and the third through hole 310 is a circular through hole; A ring-shaped pressing part 430 is arranged on it; wherein, the flat gasket 200 is sleeved on the engaging part 411 through the second through hole 210, and the shape of the engaging part 411 matches the second through hole 210, and the transmission part 100 passes through The first through hole 130 and the disc gasket 300 are respectively sleeved on the transmission part 412 through the third through hole 310, the shape of the transmission part 412 matches the first through hole 130 and the third through hole 310, and the flat gasket 200 is Squeezed and installed between the enlarged diameter part 420 and the transmission part 100, the peripheral part of the disc-shaped gasket 300 abuts against the side of the transmission part 100 away from the flat washer 200, and the middle part of the disc-shaped gasket 300 abuts and is compressed on the pressing part 430 .

It can be understood that, since the pressing part 430 is pressed against the disc washer 300, and the disc washer 300 will be pressed against the transmission part 100, and the transmission part 100 will press the flat washer 200 on the expanded diameter. part 420, so with the help of the friction between the transmission part 100 and the flat washer 200 and the disc washer 300, when the load moment on the rotating shaft 400 is small, the transmission part 100 will be able to drive the rotating shaft 400 to rotate together, And when the load torque is greater than the maximum friction torque that can be generated between the transmission part 100 and the flat gasket 200 and the disc gasket 300, the transmission part 100 will rotate relative to the rotating shaft 400, thereby realizing overload protection; and Since the rotating shaft 400 is matched with the transmission part 100 through the transmission part 412 that matches the shape of the first through hole 130, there will be no cavity between the transmission part 100 and the rotation shaft 400, and there will be no gap due to the cavity. The contact force caused by the rotation of the rotating shaft 400 changes periodically, thereby improving the noise problem during the normal rotation of the rotating shaft 400; 310, the shape of the cylindrical surface is matched, the contact area between the transmission part 412 and the transmission part 100 is also larger, it is easier to ensure the coaxiality between the transmission part 100 and the rotating shaft 400, and the output torque will be more stable , and then the product with the overload protection mechanism also runs more smoothly, which can further reduce noise; at the same time, the pressing part 430 is annular around the transmission part 412, so the circumferential direction of the middle part of the disc gasket 300 can be consistent with the pressing part 430 abutment, thereby making the degree of deformation of the disc-shaped gasket 300 more uniform in the circumferential direction, thus making it easier to control the maximum driving torque that the transmission component 100 can transmit to the rotating shaft 400, and the manufactured overload protection mechanism can achieve The fluctuation range of the maximum driving torque is smaller and closer to the design value, thereby improving the yield rate of products with the overload protection mechanism.

Referring to FIG. 3 , it can be understood that, in some embodiments, the second through hole 210 is configured as a double D-shaped hole whose edges are connected by two opposite circular arcs and two opposite line segments. The cross-sectional shape of 411 matches the shape of the second through hole 210, through the line segment part of the edge of the second through hole 210, so that the engaging part 411 will be able to engage with the second through hole 210 to limit the flat gasket 200 Relative rotation with the rotation axis 400. It can be understood that, in some other embodiments, the second through hole 210 can also be set in other non-circular shapes, such as a square, a triangle, a star or a spline groove, etc. The cross-section of the engaging part 411 The shape corresponds to the setting.

Referring to FIG. 2 and FIG. 3 , it can be understood that the portion of the transmission part 412 exposed in the third through hole 310 is pressed toward the side of the disc gasket 300 , thereby plastically deforming to form a pressure of the arched part of the disc gasket 300 . The pressing part 430, part of the pressing part 430 will enter the third through hole 310 during the plastic deformation process, so that the interference fit between the transmission part 412 and the third through hole 310, and then make the disc gasket 300300 can rotate together with the rotating shaft 400 . It can be understood that, in addition to forming the pressing part 430 by extrusion, the pressing part can also be formed by adding material to the transmission part 412. For example, the pressing part 430 can also be formed by welding to ensure the disc Shaped gasket 300 is compressed.

2 and 3, it can be understood that the transmission part 100 is provided with a first gasket installation groove 110 on the side facing the flat gasket 200, and the flat gasket 200 is located in the first gasket installation groove 110; The first gasket installation groove 110 is opened on the 100 and the flat gasket 200 is arranged in the first gasket installation groove 110, which can reduce the size of the entire overload protection mechanism in the axial direction of the rotating shaft 400, making the structure more compact; and, can It is understood that the flat washer 200 is attached to the bottom of the first washer installation groove 110, and by attaching the flat washer 200 to the bottom of the groove, the contact surface between the flat washer 200 and the transmission component 100 can be The entire plane, so the contact area between the flat gasket 200 and the transmission part 100 is more stable, and the friction torque generated between the flat gasket 200 and the transmission part 100 is also more stable, so as to further slow down the friction caused by the difference in the manufacturing process of different products. The problem of the fluctuation of the maximum driving torque caused by it, thereby reducing the defective rate. It can be understood that since the contact surface between the flat washer 200 and the transmission part 100 is a plane and the area is basically equal to the area of the flat washer 200, the maximum driving torque can also be adjusted by changing the outer diameter of the flat washer 200. effect.

Referring to Fig. 4 to Fig. 7, it can be understood that, in some embodiments, the side of the flat gasket 200 close to the transmission part 100 is provided with several convex points 220, and the groove bottom of the first gasket installation groove 110 is provided with several protrusions. The dimensions of the concave point 111 and the convex point 220 match the concave point 111 , and when the transmission component 100 and the rotating shaft 400 rotate together, the convex point 220 is embedded in the concave point 111 . For example, as shown in Figures 4 to 7, the bottom of the flat gasket 200 is provided with a raised point 220, and the bottom of the first gasket installation groove 110 is provided with a concave point 111 whose size matches the raised point 220, when the transmission part 100 When the rotating shaft 400 is driven to rotate together, the convex point 220 is embedded in the concave point 111; when the load is too large, the transmission part 100 will rotate relative to the rotating shaft 400, and the groove bottom of the first gasket installation groove 110 will continuously contact with the convex point. 220 produces an abnormal sound due to friction, and makes a "click" sound when the concave point 111 moves to the position of the convex point 220 . Through the above arrangement, the maximum transmission torque of the rotating shaft 400 and the transmission component 100 can be further increased, and the user can also judge whether the load is too large by whether there is an abnormal sound. It can be understood that the protruding point 220 is configured as a truncated cone or a hemispherical shape, and the concave point 111 is configured to match the shape of the convex point 220, so that the convex point 220 can escape from the concave point 111 smoothly when the load is too large.

It can be understood that the several convex points 220 are evenly arranged on the side of the flat gasket 200 close to the transmission part 100 , and the several concave points 111 are evenly arranged on the groove bottom of the first gasket installation groove 110 . For example, as shown in Figures 5 to 7, the side of the flat gasket 200 close to the first gasket installation groove 110 is evenly provided with bumps 220 along the circumference, and the groove bottom of the first gasket installation groove 110 is along the circumference. Concave points 111 are evenly arranged in the direction, and when the transmission component 100 drives the rotating shaft 400 to rotate together, the protruding points 220 are embedded into the corresponding concave points 111 respectively. When the load is too large, the transmission part 100 rotates relative to the rotating shaft 400, and the surface of the first gasket installation groove 110 will constantly rub against the convex point 220 to make abnormal noise, and when the concave point 111 moves to the position of the convex point 220 Make a "click". Since the convex points 220 are evenly arranged on the bottom surface of the flat gasket 200, and the concave points 111 are evenly arranged on the first gasket installation groove 110, the "click" sound can be made more frequently when the load is too large, which can More intuitively remind the user that the load at this time is too large.

It can be understood that the number of concave points 111 is more than the number of bumps 220 . For example, as shown in Figures 6 and 7, the bottom of the flat gasket 200 is evenly provided with four bumps 220 along the circumferential direction, each bump 220 is spaced at 90°, and the first gasket installation groove 110 is circumferentially Eight concave points 111 are uniformly arranged, and each concave point 111 is spaced at 45°. When the transmission part 100 drives the rotating shaft 400 to rotate together, the convex point 220 is embedded in the concave point 111 at the corresponding position. When the load is too large, the rotating shaft 400 and the transmission part 100 rotate relatively, the surface of the first gasket installation groove 110 will constantly rub against the convex point 220 and make abnormal noise, and the concave point 111 will move to the position of the convex point 220 Make a "click" sound. When the bumps 220 rub against the surface of the first gasket installation groove 110 and make abnormal noises, they will be constantly worn. By setting more concave points 111 than the number of bumps 220 at the bottom of the first gasket installation groove 110, it is possible to The stroke of friction between the bump 220 and the bottom of the first washer installation groove 110 is reduced, which prolongs the service life of the flat washer 200 and thus prolongs the service life of the overall gear overload protection. In addition, the protruding point 220 will be more frequently embedded in the concave point 111 to make a "click" sound, which can provide a better reminder effect to the user.

3 and 4, it can be understood that, in some embodiments of the present application, the transmission part 100 is provided with a second gasket installation groove 120 on the side facing the disc-shaped gasket 300, and the disc-shaped gasket 300 is disposed on The second gasket is installed in the groove 120 . Opening the second gasket installation groove 120 on the transmission part 100 and disposing the flat gasket 200 in the second gasket installation groove 120 can reduce the size of the entire overload protection mechanism in the axial direction of the rotating shaft 400 and make the structure more compact.

Referring to FIG. 2 , it can be understood that, in some further embodiments of the present application, the bottom of the second gasket installation groove 120 is provided with a ring of protrusions 121 along the outer edge of the first through hole 130 . Through the above arrangement, the contact area between the rotating shaft 400 and the transmission part 100 can be increased, the coaxiality between the rotating shaft 400 and the transmission part 100 can be further ensured, and the stability of the overload protection mechanism can be improved.

Referring to FIG. 2 and FIG. 3 , it can be understood that, in some embodiments of the present application, the end of the enlarged diameter portion 420 away from the flat gasket 200 forms an output portion, and a threaded hole 421 is provided at the end of the output portion. By providing the threaded hole 421 on the output part, the user can connect the output part with an external load through the threaded hole 421, which improves the convenience of the overload protection mechanism in use.

It can be understood that, in some embodiments of the present application, notches 422 are provided on both sides of the output part. By setting the notch 422 on both sides of the output part, the user can set a protrusion on the corresponding position of the external load part, and let the protrusion cooperate with the notch 422 to connect the output part and the external load part together, improving the safety of the overload protection mechanism when in use. convenience.

2 and 3, it can be understood that, in some embodiments of the present application, the transmission component 100 is a gear, the first through hole 130 is arranged in the center of the gear, the first gasket installation groove 110 and the second gasket The installation slots 120 are disposed on both axial sides of the gear. It can be understood that, in some other embodiments of the present application, the transmission component 100 may be other transmission components 100 such as a pulley, a sprocket, etc. in addition to a gear.

The geared motor of the embodiment of the second aspect of the present application is described below, which includes the overload protection mechanism of the embodiment of the first aspect above.

Wherein the reduction motor also includes a stator and a rotor, wherein the rotor is connected with another transmission component 100 for transmission connection with the transmission component 100, for example, when the transmission component 100 is a driven gear, a driving gear is arranged on the rotor, and the driving gear can be connected with the driven gear. The driving gear is directly meshed, or is connected with the driven gear through an intermediate gear assembly.

Since the geared motor of this embodiment adopts the overload protection structure of the above-mentioned embodiment of the first aspect, the noise during operation is lower, and the manufactured geared motor has better consistency of overload torque, so the yield rate is better.

In the description of this specification, references to the terms "one embodiment," "some embodiments," "exemplary embodiments," "example," "specific examples," or "some examples" are intended to mean that the implementation A specific feature, structure, material, or characteristic described by an embodiment or example is included in at least one embodiment or example of the present application. In this specification, schematic representations 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 any one or more embodiments or examples.

Although the embodiments of the present application have been shown and described, those skilled in the art can understand that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principle and spirit of the present application. The scope of the application is defined by the claims and their equivalents.

Claims (10)

1. An overload protection mechanism, comprising:

the transmission component is provided with a first through hole in the middle, and the first through hole is a circular through hole;

the middle part of the flat gasket is provided with a second through hole which is a non-circular rotation stopping hole;

the middle part of the disc-shaped gasket is provided with a third through hole which is a circular through hole;

the rotating shaft comprises an expanding part, a clamping part and a transmission part which are connected with each other, and an annular pressing part is arranged on the transmission part; wherein,

the flat gasket is sleeved on the clamping part through the second through hole, the clamping part is matched with the second through hole in shape, the transmission part is sleeved on the transmission part through the first through hole and the disc-shaped gasket through the third through hole respectively, the transmission part is matched with the first through hole and the third through hole in shape, the flat gasket is extruded and installed between the diameter expanding part and the transmission part, the peripheral part of the disc-shaped gasket is abutted against one side, far away from the flat gasket, of the transmission part, and the middle part of the disc-shaped gasket is abutted against and pressed on the pressing part.

2. The overload protection mechanism according to claim 1, wherein a first gasket mounting groove is formed in a side of the transmission member facing the flat gasket, and the flat gasket is positioned in the first gasket mounting groove and attached to a groove bottom of the first gasket mounting groove.

3. The overload protection mechanism according to claim 2, wherein the flat gasket has a plurality of protruding points on a side thereof adjacent to the transmission member, the first gasket mounting groove has a plurality of concave points on a bottom thereof, the protruding points are matched with the concave points in size, and the protruding points are embedded in the concave points when the transmission member rotates together with the rotation shaft.

4. The overload protection mechanism according to claim 3, wherein the plurality of raised points are uniformly disposed on a side of the flat gasket adjacent to the transmission member, and the plurality of recessed points are uniformly disposed on a bottom of the first gasket mounting groove.

5. The overload protection mechanism of claim 4, wherein the number of notches is greater than the number of lobes.

6. The overload protection mechanism of claim 1, wherein a second gasket mounting slot is provided in a side of the transmission member facing the disc-shaped gasket, the disc-shaped gasket being disposed in the second gasket mounting slot.

7. The overload protection mechanism of claim 6, wherein the groove bottom of the second gasket mounting groove is provided with a ring of protrusions along the outer edge of the first through hole.

8. The overload protection mechanism according to any one of claims 1 to 7, wherein an end of the enlarged diameter portion remote from the flat gasket forms an output portion, and the end of the output portion is provided with a threaded hole.

9. The overload protection mechanism of claim 8, wherein notches are provided on both sides of the output portion.

10. A geared motor comprising an overload protection mechanism according to any one of claims 1 to 9.

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