Cutting mechanism and mower adopting same

Abstract

The utility model discloses a cutting mechanism and a mower adopting the same. A cutting mechanism comprises a connecting piece and a cutterhead which are detachably connected, the connecting piece is used for being connected with an output shaft of a motor, a butt joint hole which is connected with the connecting piece in an inserted mode in the axial direction is formed in the center of the cutterhead, and the connecting piece abuts against the cutterhead in the circumferential direction; the cutting mechanism further comprises an elastic clamping needle, the elastic clamping needle comprises an abutting portion and an elastic clamping portion, a fixing portion protruding out of the surface of the cutter head is arranged on the portion, beside the butt joint hole, of the cutter head, the fixing portion is clamped by the clamping portion and the abutting portion, the abutting portion penetrates through the fixing portion to abut against the connecting piece, and the connecting piece is located between the cutter head and the abutting portion in the axial direction. The mowing machine adopts the cutting mechanism in the scheme. The cutter head has the advantages that the cutter head can be disassembled and assembled without a tool, the structure is simple, auxiliary structures such as a slide way do not need to be arranged, the assembly is very simple, a tool-free replacement structure of the whole cutting mechanism is simplified, and meanwhile, the overall cost is reduced.

Description

Technical Field

[0001] The utility model relates to the field of outdoor work, in particular to a cutting mechanism and a lawn mower adopting the mechanism. Background Art

[0002] A lawn mower is a commonly used outdoor cutting tool, which mainly uses a motor to drive a blade to rotate for cutting. The blade and motor of a current lawn mower are detachably connected, which is convenient for replacing the blade, but the blade is usually fixed to the motor with screws, and tools are required when disassembling and assembling, making it very inconvenient.

[0003] There are also lawn mowers that use clips to achieve tool-free disassembly and assembly of the blade disc, but the setting of the clips requires the setting of many parts such as springs and slides, which makes the overall structure of the lawn mower complicated and the assembly also complicated. If the clip is stuck and cannot be unlocked, the entire clip part needs to be destroyed and the replacement cost will also increase. Utility Model Content

[0004] The utility model aims to provide a cutting mechanism and a lawn mower using the same, which can effectively solve the problem of complicated connection structure of the existing lawn mowers with tool-free disassembly and assembly of the cutter disc.

[0005] In order to solve the above technical problems, the utility model is achieved through the following technical solutions:

[0006] A cutting mechanism, comprising a detachably connected connecting piece and a cutter disc, wherein the connecting piece is used to connect to the output shaft of a motor, a docking hole is provided at the center of the cutter disc for plugging with the connecting piece in the axial direction, and the connecting piece abuts against the cutter disc in the circumferential direction;

[0007] The cutting mechanism also includes an elastic clamping pin, which includes a stop portion and an elastic clamping portion. A fixing portion protruding from the surface of the cutter disc is provided on the cutter disc next to the docking hole. The clamping portion and the stop portion clamp the fixing portion. The stop portion passes through the fixing portion and abuts against the connecting piece. The connecting piece is axially located between the cutter disc and the stop portion.

[0008] In the above-mentioned cutting mechanism, the fixing portion is a cylinder with a circular ring-shaped cross section and is coaxial with the cutter disc, and the clamping portion is tightly attached to the outer side wall of the fixing portion.

[0009] In the above-mentioned cutting mechanism, the fixing portion is provided with a first fixing hole and a second fixing hole for the abutting portion to pass through, and a portion of the abutting portion located between the first fixing hole and the second fixing hole abuts against the connecting member.

[0010] In the above-mentioned cutting mechanism, the abutting portion is movably arranged in the first fixing hole and the second fixing hole along the clamping direction of the abutting portion and the clamping portion.

[0011] In the above-mentioned cutting mechanism, a stopper protruding in the radial direction is provided on the outer side wall of the fixing portion to limit the clamping portion from axially separating from the fixing portion.

[0012] In the above-mentioned cutting mechanism, the connecting member includes a connecting portion and a first abutting portion with a non-circular cross-section, the connecting portion is connected to the output shaft of the motor, and a second abutting portion abutting against the first abutting portion is provided on the inner side wall of the docking hole.

[0013] In the above-mentioned cutting mechanism, the first abutting portion is a gear; or the cross-section of the first abutting portion is one of an ellipse and a regular polygon.

[0014] In the above-mentioned cutting mechanism, the first abutting portion protrudes radially from the connecting portion, and the stop portion abuts against an end surface of the first abutting portion.

[0015] In the above-mentioned cutting mechanism, a guiding inclined surface is provided on the end surface of the connecting member facing the docking hole.

[0016] The utility model also discloses a lawn mower which adopts the cutting mechanism in any one of the above solutions.

[0017] Compared with the prior art, the advantages of the utility model are:

[0018] By setting an elastic clamping pin to cooperate with the cutter disc to limit the connecting piece axially by means of an elastic clamping fixing part, the problem of the complicated connection structure of the current lawn mower with tool-free cutter disc disassembly and assembly is solved. During installation, as long as the stop part of the elastic clamping pin passes through the fixing part of the cutter disc and abuts against the connecting piece, the axial direction of the connecting piece can be fixed. Since the cutter disc is mainly subjected to circumferential cutting force and the axial force is relatively small during operation, the elastic clamping pin does not need to bear a large force, which is conducive to controlling the cost of the elastic clamping pin and reducing the cost of use and replacement. In addition, since the elastic clamping pin is fixed in relative position by means of an elastic clamping fixing part, it is also possible to disassemble and assemble without tools, and tool-free disassembly and assembly can be achieved, which is convenient for users to replace the cutter disc. Since the connecting piece and the cutter disc abut in the circumferential direction, and the connecting piece is connected to the output shaft of the motor, the power of the motor can be transmitted to the cutter disc through the connecting piece, and the cutter disc is driven to rotate for cutting. The cutting mechanism of the above structure not only realizes the tool-free disassembly and assembly of the cutter disc, but also has a simple structure and does not require the setting of auxiliary structures such as slideways. The assembly is also extremely simple, which simplifies the tool-free replacement structure of the entire cutting mechanism and reduces the overall cost.

[0019] Furthermore, the fixing part is a cylinder with a circular cross section and is coaxial with the cutter disc, and the clamping part is closely attached to the outer side wall of the fixing part. The fixing part is circular and coaxial with the cutter disc, which can extend the length of the docking hole, so that the connecting part and the cutter disc have a larger contact area in the circumferential direction, and improve the reliability of the circumferential transmission of the two. The clamping part is closely attached to the outer side wall of the fixing part, which also makes the elastic clamping pin clamp the fixing part more firmly, and because the fixing part is circular, the contact area between the clamping part and the fixing part is maximized.

[0020] Furthermore, the fixing portion is provided with a first fixing hole and a second fixing hole for the stop portion to pass through, and the stop portion located between the first fixing hole and the second fixing hole abuts against the connecting piece. The stop portion is axially supported by the first fixing hole and the second fixing hole, so that the stop portion can limit the connecting piece more stably.

[0021] Furthermore, the stop portion is movably arranged in the first fixing hole and the second fixing hole along the clamping direction of the stop portion and the clamping portion. When the elastic clamping pin is inserted into the fixing portion, the movable arrangement of the stop portion can reduce the elastic deformation of the clamping portion, thereby reducing the force required to be applied when the elastic clamping pin clamps the fixing portion, making installation more convenient.

[0022] Furthermore, a radially protruding stopper is provided on the outer side wall of the fixing portion to limit the clamping portion from axially separating from the fixing portion. The protruding stopper prevents the clamping portion from circumferentially separating from the fixing portion, thereby preventing the elastic clamping needle from loosening during the operation of the cutting mechanism.

[0023] Furthermore, the connecting member includes a connecting portion and a first abutting portion with a non-circular cross section, the connecting portion is connected to the output shaft of the motor, and a second abutting portion abutting against the first abutting portion is provided on the inner side wall of the docking hole. The cross section of the first abutting portion is non-circular, so that the first abutting portion and the second abutting portion can produce a larger area of ​​abutment in the circumferential direction, so that the connecting member and the cutter disc will not rotate relative to each other, thereby improving the transmission efficiency of the connecting member and the cutter disc.

[0024] Furthermore, the first abutting portion is a gear; or the cross section of the first abutting portion is one of an ellipse and a regular polygon. Setting the first abutting portion as a gear can obtain a relatively uniform force in the circumferential direction, and setting the cross section of the first abutting portion as an ellipse or a regular polygon is easy to process, and can quickly realize the plug-in of the connecting member and the cutter head, reducing the angle that needs to be adjusted when the first abutting portion and the second abutting portion abut against each other in the axial direction during plug-in.

[0025] Furthermore, the first abutting portion protrudes radially from the connecting portion, and the stop portion abuts against the end surface of the first abutting portion. The protruding first abutting portion not only has a larger diameter to obtain a larger contact surface with the second abutting portion, but also the end surface can abut against the stop portion of the elastic clamping pin without providing an additional component on the connecting piece to cooperate with the abutting portion.

[0026] Furthermore, the end surface of the connector facing the docking hole is provided with a guiding slope, which plays a guiding role when the connector is plugged into the cutter head, making it more convenient to plug the connector into the cutter head.

[0027] The utility model also discloses a lawn mower, which adopts the cutting mechanism of any of the above schemes, and the blade disc can be quickly replaced without using tools, and the connection structure between the blade disc and the motor is simple and reliable, which is conducive to reducing the failure rate and reducing production costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 This is a three-dimensional diagram of a cutting mechanism of the utility model;

[0029] Figure 2 This is a schematic diagram of the structure of a cutting mechanism connected to a motor in the utility model;

[0030] Figure 3 It is an exploded view of a cutting mechanism of the utility model.

[0031] The accompanying drawings are marked as follows:

[0032] Connecting member 10, connecting portion 11, first abutting portion 12, guiding inclined surface 13;

[0033] The cutter disc 20, the docking hole 21, the fixing portion 22, the first fixing hole 23, the second fixing hole 24, the stopper 25, and the second abutting portion 26;

[0034] Motor 30;

[0035] The elastic clamping pin 40 , the abutting portion 41 , and the clamping portion 42 . DETAILED DESCRIPTION

[0036] A cutting mechanism comprises a detachably connected connector 10 and a cutter disc 20, wherein the connector 10 is used to be connected to the output shaft of a motor 30, and a docking hole 21 is provided at the center of the cutter disc 20 for axially plugging into the connector 10, and the connector 10 abuts against the cutter disc 20 along the circumferential direction; the cutting mechanism also comprises an elastic clamping pin 40, and the elastic clamping pin 40 comprises a stop portion 41 and an elastic clamping portion 42, and a fixing portion 22 protruding from the surface of the cutter disc 20 is provided on the cutter disc 20 next to the docking hole 21, and the clamping portion 42 and the stop portion 41 clamp the fixing portion 22, and the stop portion 41 passes through the fixing portion 22 and abuts against the connector 10, and the connector 10 is located between the cutter disc 20 and the stop portion 41 along the axial direction.

[0037] By setting the elastic clamping pin 40 to cooperate with the blade disc 20 in the axial direction to limit the connecting member 10 by means of the elastic clamping fixing part 22, the problem of the complicated connection structure of the existing lawn mowers that do not require tools to disassemble and assemble the blade disc 20 is solved. During installation, as long as the stop part 41 of the elastic clamping pin 40 passes through the fixing part 22 of the blade disc 20 and abuts against the connecting member 10, the axial direction of the connecting member 10 can be fixed. Since the blade disc 20 is mainly subjected to circumferential cutting force during operation and the axial force is relatively small, the elastic clamping pin 40 does not need to bear a large force, which is conducive to controlling the cost of the elastic clamping pin 40 and reducing the cost of use and replacement. In addition, since the elastic clamping pin 40 is fixed in relative position by means of the elastic clamping fixing part 22, it does not require the use of tools for disassembly and assembly, and can be disassembled and assembled without tools, making it convenient for users to replace the blade disc 20. Since the connecting member 10 and the cutter disc 20 are in contact with each other along the circumferential direction, and the connecting member 10 is connected to the output shaft of the motor 30, the power of the motor 30 can be transmitted to the cutter disc 20 through the connecting member 10, and the cutter disc 20 is driven to rotate for cutting. The cutting mechanism with the above structure not only realizes the tool-free disassembly and assembly of the cutter disc 20, but also has a simple structure, does not need to set auxiliary structures such as slideways, and is also very simple to assemble, which simplifies the tool-free replacement structure of the entire cutting mechanism and reduces the overall cost.

[0038] The embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings. The embodiments described below with reference to the accompanying drawings are exemplary and intended to be used to explain the present invention, but cannot be understood as limiting the present invention.

[0039] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do 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 therefore should not be understood as a limitation on the present invention.

[0040] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of the present utility model, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0041] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral one; it can be a mechanical connection, an electrical connection, or communication with each other; it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0042] See also Figures 1 to 3 This is an embodiment of a cutting mechanism and a lawn mower using the same according to the utility model, comprising a detachably connected connecting member 10 and a cutter disc 20, wherein the connecting member 10 is used to connect the output shaft of a motor 30, a connecting hole is provided on the connecting member 10, and the output shaft of the motor 30 is fixed in the connecting hole. The specific fixing method can refer to the existing technical solution.

[0043] The center of the cutter disc 20 is provided with a docking hole 21 along the circumferential direction for plugging with the connector 10. The connector 10 is inserted into the docking hole 21, and the connector 10 and the cutter disc 20 are in contact with each other along the circumferential direction, so that the power transmission between the motor 30 and the cutter disc 20 is realized through the connector 10, so that the motor 30 can drive the cutter disc 20 to rotate around the axis, and the connector 10 and the cutter disc 20 are in contact with each other along the circumferential direction, so as to ensure that the connector 10 drives the cutter disc 20 to rotate without circumferential slippage, thereby ensuring the power transmission efficiency. The circumferential fixation of the connector 10 and the cutter disc 20 is completed by the above structure, and the axial fixation of the connector 10 and the cutter disc 20 needs to rely on the following structure: the cutting mechanism also includes an elastic clamping pin 40, and the elastic clamping pin 40 includes a stop portion 41 and an elastic clamping portion 42. The stop portion 41 and the clamping portion 42 can be made of the same material, or made of different materials and then formed into the elastic clamping pin 40 by welding or bonding. Generally, the elastic clamping pin 40 is made in one piece, so that the structural strength will be better. A fixing portion 22 protruding from the surface of the cutter disc 20 is provided on the cutter disc 20 beside the docking hole 21. The fixing portion 22 generally protrudes toward the direction of the motor 30 so as not to hinder the cutter disc 20 from cutting. The stop portion 41 passes through the fixing portion 22 and extends toward the connecting member 10. The stop portion 41 passing through the fixing portion 22 abuts against the connecting member 10, and the connecting member 10 is located between the cutter disc 20 and the stop portion 41, thereby achieving axial fixation of the connecting member 10. Of course, to achieve that the connecting member 10 is located between the cutter disc 20 and the stop portion 41, the docking hole 21 can be set as a blind hole, or a component such as a stop bar that blocks the connecting member 10 is provided at the bottom of the docking hole 21, and the elastic clamping pin 40 is used to limit the axial position of the connecting member 10.

[0044] Furthermore, the main function of the fixing portion 22 is to limit the stop portion 41 of the elastic clamping pin 40 so that it can abut against the connecting member 10. Therefore, the fixing portion 22 can be made into a block shape and provided with a fixing hole so that the stop portion 41 can abut against the connecting member 10 after passing through the fixing hole. In this embodiment, the fixing portion 22 is a cylinder with a circular cross section and is coaxial with the cutter head 20. In this way, on the one hand, the fixing portion 22 can be used to increase the length of the docking hole 21 and improve the stability of the circumferential abutment between the connecting member 10 and the docking hole 21. On the other hand, the strength of the entire fixing portion 22 is also improved. The abutting portion passes through the fixing portion 22, while the clamping portion 42 is always located outside the fixing portion 22. The clamping portion 42 can also be made into an arc shape, and the clamping portion 42 is tightly attached to the outer wall of the fixing portion 22, thereby preventing the elastic clamping pin 40 from shaking after the fixing portion 22 is clamped.

[0045] The stop portion 41 is generally in the shape of a rod, which makes it easy to insert or pull out the stop portion 41 from the fixing portion 22. However, if the stop portion 41 is inserted into the fixing portion 22 and the contact length with the connecting member 10 is too long, the end of the stop portion 41 will be pried, thereby weakening the contact ability with the connecting member 10. After long-term operation, the stop portion 41 will bend and deform to lose its contact ability. Therefore, a first fixing hole 23 and a second fixing hole 24 are opened on the fixing portion 22 for the stop portion 41 to pass through. The end of the stop portion 41 passes through the first fixing hole 23 and then passes through or passes out of the second fixing hole 24. The part of the stop portion 41 located between the first fixing hole 23 and the second fixing hole 24 contacts the connecting member 10. In this way, the stop portion 41 is equivalent to having two fulcrums, and the part of the stop portion 41 that works is between the two fulcrums. In this way, the stop portion 41 can be fixed more stably and always maintain the contact state with the connecting member 10.

[0046] Furthermore, the stop portion 41 is movably arranged in the first fixing hole 23 and the second fixing hole 24 along the clamping direction of the stop portion 41 and the card machine part, and when the elastic card pin 40 is inserted into the fixing part 22, the deformation of the clamping portion 42 is reduced, making the insertion of the elastic card pin 40 easier. Specifically, the cross-section of the first fixing hole 23 and the second fixing hole 24 can be set to be a long strip or an ellipse, and the length or long axis direction thereof is consistent with the clamping direction of the stop portion 41 and the card machine part, so that the stop portion 41 has a certain degree of mobility in this direction.

[0047] In addition, in order to prevent the elastic clamping pin 40 from rotating along the length direction of the stop portion 41 after clamping the fixing portion 22, a radially protruding stop block 25 is provided on the outer wall of the fixing portion 22 to block the rotation of the clamping portion 42, so that the clamping portion 42 cannot rotate around the stop portion 41 and detach from the fixing portion 22, thereby improving the reliability of the connection between the elastic clamping pin 40 and the fixing portion 22 and preventing the elastic clamping pin 40 from loosening during the operation of the equipment.

[0048] On the basis of the above embodiment, the connecting member 10 includes a connecting portion 11 and a first abutting portion 12 with a non-circular cross section. The connecting portion 11 is mainly used to connect with the output shaft of the motor 30. A connecting hole is opened in the center of the connecting portion 11, and the output shaft of the motor 30 is inserted into the connecting hole and fixedly connected together. The connecting portion 11 and the first abutting portion 12 can be connected side by side along the axial direction, and the connecting hole can also extend into the first abutting portion 12, so that the connection length of the connecting member 10 and the output shaft of the motor 30 can be increased, making the connection between the two more stable; the first abutting portion 12 can also be covered on the outside of the connecting portion 11, which can effectively shorten the length of the connecting member 10 and fit into a narrower space. A second abutting portion 26 that abuts against the first abutting portion 12 is provided on the inner side wall of the docking hole 21, and cooperates with each other to achieve the abutment of the cutter disc 20 and the connecting member 10. In this embodiment, the connecting portion 11 and the first abutting portion 12 are arranged side by side, and the first abutting portion 12 protrudes from the connecting portion 11 in the radial direction, so that the protruding portion on the first abutting portion 12 will form an abutting surface, which allows the abutting portion of the elastic card pin 40 to abut on it without affecting the connection between the connecting member 10 and the output shaft of the motor 30, nor the connection between the connecting member 10 and the cutter disc 20.

[0049] Furthermore, for the first abutting portion 12 with a non-circular cross section, the first abutting portion 12 can be set as a gear, and the corresponding second abutting portion 26 is an internal gear. The two can achieve circumferential uniform force transmission through tooth meshing. The first abutting portion 12 can also be set to have a cross section of an elliptical shape or a regular polygon, and the second abutting portion 26 is adapted to the shape of the first abutting portion 12 to increase the contact area between the second abutting portion 26 and the first abutting portion 12. These shapes are relatively regular and easy to process, and are also relatively easy to align when the connecting member 10 and the cutter disc 20 are docked. Even if the first abutting portion 12 and the second abutting portion 26 are not aligned in the axial direction during docking, they only need to be rotated slightly to achieve axial misalignment and then plugged together. Further, the end face of the connecting member 10 facing the docking hole 21 is provided with a guide bevel 13, and the guide bevel 13 can play a guiding role when the connecting member 10 is inserted into the docking hole 21, so that the axis of the connecting member 10 can coincide with the axis of the docking hole 21.

[0050] When the cutter disc 20 needs to be installed, first connect the connecting member 10 to the output shaft of the motor 30, then align the connecting member 10 with the docking hole 21 of the cutter disc 20, and insert the connecting member 10 into the docking hole 21, so that the first abutting portion 12 on the connecting member 10 and the second abutting portion 26 in the docking hole 21 are circumferentially abutted, thereby completing the circumferential relative fixation of the connecting member 10 and the cutter disc 20. Then insert the stop portion 41 of the elastic clamping pin 40 from the first fixing hole 23. As the insertion process continues, the clamping portion 42 will produce elastic deformation. When the stop portion 41 is inserted into the second fixing hole 24, the clamping portion 42 will be completely attached to the outer wall of the fixing portion 22. The clamping portion 42 will cooperate with the stop portion 41 to clamp the fixing portion 22, completing the installation of the elastic clamping pin 40. At this time, the portion of the stop portion 41 located between the first fixing hole 23 and the second fixing hole 24 will axially abut on the connecting member 10. The connecting member 10 is located between the blade 20 and the stop portion 41 to complete the axial fixation of the connecting member 10, thereby completing the assembly of the cutting mechanism. If one elastic clamping pin 40 is not enough to complete the axial fixation of the connecting member 10, one or more elastic clamping pins 40 can be added. It is only necessary to open a corresponding fixing hole on the fixing portion 22 and insert the elastic clamping pin 40 into the corresponding fixing hole. When the cutter disc 20 needs to be disassembled, the user can pull the elastic clamping pin 40 by hand to overcome the elastic deformation force of the clamping portion 42 to pull the stop portion 41 out of the fixing hole, and then separate the connector 10 from the cutter disc 20. The entire assembly and disassembly process is simple and easy to operate, and no tools are required. In addition, the elastic clamping pin 40 has a relatively simple structure and low cost, which can ensure that the connector 10 is firmly connected to the cutter disc 20 while reducing the manufacturing difficulty.

[0051] The utility model also discloses a lawn mower, which adopts the cutting mechanism of any of the above schemes, can realize the rapid assembly and disassembly of the cutter disc 20 without tools, and the connection structure between the motor 30 and the cutter disc 20 is simple, which not only reduces the cost but also has a firm connection and high stability.

[0052] The above description is only a specific embodiment of the present invention, but the technical features of the present invention are not limited thereto. Any changes or modifications made by any technician in the field of the present invention are included in the patent scope of the present invention.

Claims

1. A cutting mechanism, comprising a detachably connected connecting member and a cutter disc, wherein the connecting member is used to connect to an output shaft of a motor, characterized in that: The center of the cutter disc is provided with a docking hole which is plugged into the connecting piece along the axial direction, and the connecting piece abuts against the cutter disc along the circumferential direction; The cutting mechanism also includes an elastic clamping pin, which includes a stop portion and an elastic clamping portion. A fixing portion protruding from the surface of the cutter disc is provided on the cutter disc next to the docking hole. The clamping portion and the stop portion clamp the fixing portion. The stop portion passes through the fixing portion and abuts against the connecting piece. The connecting piece is axially located between the cutter disc and the stop portion.

2. A cutting mechanism according to claim 1, characterized in that: The fixing portion is a cylinder with a circular cross section and is coaxial with the cutter disc, and the clamping portion is tightly attached to the outer side wall of the fixing portion.

3. A cutting mechanism according to claim 1 or 2, characterized in that: The fixing portion is provided with a first fixing hole and a second fixing hole for the abutting portion to pass through, and a portion of the abutting portion located between the first fixing hole and the second fixing hole abuts against the connecting member.

4. A cutting mechanism according to claim 3, characterized in that: The stop portion is movably arranged in the first fixing hole and the second fixing hole along the clamping direction of the stop portion and the clamping portion.

5. A cutting mechanism according to claim 2, characterized in that: A stopper protruding in the radial direction is provided on the outer side wall of the fixing portion to limit the clamping portion from axially separating from the fixing portion.

6. A cutting mechanism according to claim 1, characterized in that: The connecting member comprises a connecting portion and a first abutting portion with a non-circular cross section, the connecting portion is connected to the output shaft of the motor, and a second abutting portion abutting against the first abutting portion is provided on the inner side wall of the docking hole.

7. A cutting mechanism according to claim 6, characterized in that: The first abutting portion is a gear; or the cross section of the first abutting portion is one of an ellipse and a regular polygon.

8. A cutting mechanism according to claim 6, characterized in that: The first abutting portion protrudes from the connecting portion in the radial direction, and the stop portion abuts against an end surface of the first abutting portion.

9. A cutting mechanism according to claim 1, characterized in that: The end surface of the connecting piece facing the docking hole is provided with a guiding inclined surface.

10. A lawn mower, characterized in that: A cutting mechanism as claimed in any one of claims 1 to 9 is adopted.

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