Lawn mower

Abstract

The application relates to the technical field of grass cutting equipment, and relates to a mower which comprises a vehicle frame, a shell arranged on the vehicle frame, the shell having a containing space, a rotary adjusting mechanism comprising a lifting frame and a rotating assembly, the rotating assembly being in transmission connection with the lifting frame, the rotating assembly being used for adjusting the lifting height of the lifting frame through rotation, a cutter disc assembly arranged on the lifting frame and synchronously lifted with the lifting frame, wherein the lifting frame is connected with the vehicle frame and arranged in the containing space of the shell, the rotating assembly is arranged on the shell, the rotating assembly is provided with a limiting part, the shell is provided with a rotary stop part, the limiting part is matched with the rotary stop part, and the rotary stop part is used for limiting the rotation angle of the rotating assembly. The rotary stop part is arranged on the shell and used for limiting the rotation angle of the rotating assembly. When the cutter disc height is adjusted to the highest or lowest limit position, the rotary stop part mechanically limits the rotating assembly, so that the user can stop the rotation operation in time.

Description

Technical Field

[0001] This application relates to the field of lawn mowing equipment technology, and more particularly to a lawn mower. Background Technology

[0002] When operating a lawnmower, the height of the blade from the ground needs to be adjusted according to the growth of the grass, the undulation of the terrain, and the trimming requirements.

[0003] In related technologies, some lawnmowers use a rotary height adjustment mechanism to adjust the height of the blade. When adjusting the blade, the user cannot clearly perceive the adjustment limit of the rotary height adjustment mechanism. For example, if the blade has reached the highest or lowest position, the user may continue to rotate it with force, which can easily lead to damage to the rotary adjustment mechanism. Summary of the Invention

[0004] In view of this, this application provides a lawnmower to solve the problem that the limit of the blade height adjustment cannot be clearly perceived when rotating to adjust the blade height.

[0005] This application provides a lawnmower, comprising: a frame; and a housing disposed on the frame, the housing having a receiving space; A rotary adjustment mechanism includes a lifting frame and a rotary assembly, wherein the rotary assembly is throttle-connected to the lifting frame, and the rotary assembly adjusts the lifting height of the lifting frame by rotating. A cutter head assembly is disposed on the lifting frame, and the cutter head assembly moves up and down synchronously with the lifting frame; The lifting frame is connected to the vehicle frame and is disposed within the housing's accommodating space. The rotating component is disposed in the housing and has a limiting part. The housing has a rotation stop part. The limiting part and the rotation stop part cooperate to limit the rotation angle of the rotating component.

[0006] In one possible implementation, the rotation stop includes a first stop and a second stop, the first stop and the second stop being spaced apart along the rotation direction of the rotating assembly; The limiting portion extends between the first stop portion and the second stop portion, so that when the limiting portion is rotated to the limit position, it abuts against the first stop portion or the second stop portion.

[0007] In one possible implementation, the limiting portion is a protrusion disposed on the outer peripheral wall of the rotating assembly and extending radially away from the rotating assembly. Both the first stop and the second stop are protruding structures provided on the surface of the housing, and the first stop and the second stop are located on the outer periphery of the rotating assembly.

[0008] In one possible implementation, the rotating assembly includes a rotating member rotatably disposed in the housing, the rotating member extending through the housing and into the receiving space for connection with the lifting frame.

[0009] In one possible implementation, the outer peripheral wall of the rotating member is provided with a helical boss, the helical boss is placed in the receiving space, and a helical guide surface is provided on the surface of the helical boss. The lifting frame has a lifting part that abuts against the spiral guide surface. The rotating component rotates to cause the spiral guide surface to drive the lifting part to lift the lifting frame.

[0010] In one possible implementation, the rotating assembly further includes a gear set, at least one gear in the gear set having a toothed section and a toothless section, the toothed section for meshing transmission and the toothless section for stopping transmission.

[0011] In one possible implementation, the gear assembly includes a driving gear and a driven gear, both of which are disposed on the surface of the housing; The outer peripheral wall of the driving gear is provided with a first toothless section and a first toothed section. The first toothed section meshes with the driven gear for transmission. The driven gear is connected to the transmission component. The limiting part is provided in the first toothless section and extends radially along the driving gear.

[0012] In one possible implementation, the driven gear is provided with a first mating portion, and the rotating member is provided with a second mating portion corresponding to the first mating portion; The driven gear is mounted on the rotating member, and the first mating part corresponds to the second mating part, so as to define the relative position of the driven gear and the rotating member.

[0013] In one possible implementation, the driven gear has a second toothed segment and a second toothless segment on its outer peripheral wall. The second toothed segment is used for meshing transmission with the first toothed segment. The second toothless segment has a positioning notch. The housing surface has a positioning part corresponding to the positioning notch. The positioning notch and the positioning part are shaped to match. The driven gear is matched and assembled with the positioning part through the positioning notch.

[0014] In one possible implementation, the housing surface is provided with an assembly portion, the assembly portion is circumferentially disposed on the outer periphery of the gear assembly, the gear set is assembled inside the assembly portion, and the rotation stop portion is disposed on the inner wall of the assembly portion; The assembly part is also provided with a mounting base, and the drive gear is sleeved on the mounting base. The drive gear can rotate around the axis of the mounting base.

[0015] In one possible implementation, it further includes: a top cover, which is mounted corresponding to the assembly to cover the gear assembly, and the top cover is connected to the housing.

[0016] In one possible implementation, it further includes: a knob component, rotatably connected to the upper cover, extending from the outside of the upper cover into the inside of the upper cover and fixedly connected to the drive gear; The surface of the drive gear facing the upper cover is provided with a guide cylinder, and the guide cylinder extends toward the upper cover. The guide cylinder is also equipped with an elastic element and a hand-feel wheel; The elastic element is sleeved on the outside of the guide cylinder, and the hand-feel wheel is located at the end of the guide cylinder facing the upper cover; The guide cylinder is provided with a first guide limiting part, and the hand-feel wheel is provided with a second guide limiting part. The first guide limiting part and the second guide limiting part correspond to each other so that the hand-feel wheel can move along the axial direction of the guide cylinder and can rotate with the drive gear. One end of the elastic element abuts against the drive gear, and the other end abuts against the hand-feel wheel, so that the hand-feel wheel abuts against the top cover; The upper cover and the surface opposite the hand-feel wheel are respectively provided with a touch part and a response part. The hand-feel wheel can rotate with the drive gear so that the response part rotates relative to the touch part to produce a sound.

[0017] Implementing the embodiments of this application has the following beneficial effects: In this embodiment of the lawnmower, the rotary adjustment mechanism includes a lifting frame and a rotating assembly. The rotating assembly is connected to the lifting frame via a transmission connection. Rotation of the lifting frame adjusts its lifting state, thereby synchronously raising and lowering the blade assembly, achieving flexible adjustment of the blade height. This adjustment method is convenient to operate and allows for continuous or stepped height settings within the adjustment stroke, based on lawn growth, terrain undulations, or mowing needs, which helps improve the uniformity of lawn mowing and work efficiency. Simultaneously, the lifting frame is fixed to the frame and housed within the casing's containment space, effectively protecting the adjustment mechanism, reducing the intrusion of external grass clippings, dust, and other foreign objects, and improving the lawnmower's structural reliability and service life in complex operating environments.

[0018] In this embodiment of the lawnmower, the housing is provided with a rotation stop to limit the rotation angle of the rotating component. When the blade height is adjusted to the highest or lowest limit position, the rotation stop mechanically limits the rotating component, allowing the user to obtain clear operational feedback through tactile feedback, clearly perceive the adjustment limit, and thus stop the rotation operation in time. This effectively prevents damage to the rotation adjustment mechanism caused by the user continuing to rotate with force after reaching the limit, which is beneficial for protecting transmission components, reducing maintenance costs, and improving operational safety and the durability of the mechanism. Attached Figure Description

[0019] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0020] Figure 1 A schematic diagram of the lawnmower structure in an embodiment of this application is shown; Figure 2 This invention provides a schematic diagram of the lawnmower from another perspective in an embodiment of the present application. Figure 3 A schematic diagram of the rotation adjustment mechanism and housing assembly in an embodiment of this application is shown; Figure 4 An embodiment of this application is shown. Figure 3 A magnified view of a portion of the image; Figure 5 An embodiment of this application is shown. Figure 3 A schematic diagram of the AA cross-section; Figure 6 This application shows a schematic diagram of the assembly of the housing and the frame in an embodiment of the present application; Figure 7 An embodiment of this application is shown. Figure 6 A magnified view of a portion of the image; Figure 8 A schematic diagram of the rotary adjustment mechanism in an embodiment of this application is shown; Figure 9 A schematic diagram of the lifting frame in an embodiment of this application is shown; Figure 10 A schematic diagram of the rotating component in an embodiment of this application is shown; Figure 11 An exploded view of the rotating component in an embodiment of this application is shown; Figure 12 A schematic diagram of the structure of the upper cover in an embodiment of this application is shown; Figure 13A schematic diagram of the drive gear in an embodiment of this application is shown; Figure 14 A schematic diagram of the driven gear in an embodiment of this application is shown.

[0021] Figure label: 1. Lawn mower; 10. Frame; 20. Housing; 21. Rotation stop; 211. First stop; 212. Second stop; 22. Positioning part; 23. Assembly part; 24. Mounting base; 30. Rotary adjustment mechanism; 31. Lifting frame; 311. Lifting part; 32. Rotating assembly; 321. Limiting part; 322. Rotating component; 3221. Helical boss; 3221a. Helical guide surface; 3222. Second mating part; 323. Driving gear; 3231. First toothless section; 3232. First toothed section; 3233. Guide cylinder; 3233a. First guide limiting part; 324. Driven gear; 3241. First mating part; 3242. Second toothed section; 3243. Second toothless section; 3243a. Positioning notch; 40. Cutter head assembly; 50. Top cover; 51. Response unit; 60. Knob; 61. Rotary shaft; 611. Clamping claw; 70. Elastic element; 80. Hand-feel wheel; 81. Second guide limit part; 82. Actuating part. Detailed Implementation

[0022] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0023] When operating a lawnmower, the height of the blade head above the ground needs to be adjusted according to the lawn's growth, terrain undulations, and mowing requirements. Related technologies often employ rotary adjustment mechanisms (such as handwheels or knobs driving lead screws) to raise and lower the blade head. However, users cannot clearly perceive whether the blade head has reached its highest or lowest limit while rotating it. Continuing to rotate forcefully after reaching the limit can easily lead to stripped threads inside the adjustment mechanism, broken transmission components, deformation of the lifting frame, or even damage to the housing, severely impacting the lawnmower's lifespan and adjustment reliability.

[0024] Based on this, see Figures 1 to 14 As shown, an embodiment of the present invention provides a lawnmower 1, including: a frame 10; a housing 20 disposed on the frame 10, the housing 20 having a receiving space; The rotary adjustment mechanism 30 includes a lifting frame 31 and a rotary component 32. The rotary component 32 is connected to the lifting frame 31 by transmission, and the rotary component 32 adjusts the lifting height of the lifting frame 31 by rotating. The cutter head assembly 40 is mounted on the lifting frame 31, and the cutter head assembly 40 moves up and down synchronously with the lifting frame 31. The lifting frame 31 is connected to the vehicle frame 10 and is located in the housing space of the housing 20. The rotating component 32 is located in the housing 20. The rotating component 32 is provided with a limiting part 321. The housing 20 is provided with a rotation stop part 21. The limiting part 321 and the rotation stop part 21 cooperate to limit the rotation angle of the rotating component 32.

[0025] Understandably, the frame 10 serves as the load-bearing base for the lawnmower 1, and is used to mount the wheels, drive components, etc.

[0026] Both the housing 20 and the rotation adjustment mechanism 30 are directly or indirectly connected to the frame 10 to ensure the structural stability and adjustment accuracy of the cutter head assembly 40 during the adjustment process.

[0027] The housing 20 is fixedly mounted on the frame 10 and forms an internal space to protect part of the transmission structure of the rotary adjustment mechanism 30. It also provides an external cover and prevents debris such as grass clippings from entering the rotary adjustment mechanism 30 and affecting the stable operation of the mechanism.

[0028] The housing 20 is provided with a rotation stop 21. The rotation stop 21 can be a block, a limiting step, etc., provided on the housing 20. The rotation stop 21 can be integrally formed with the housing 20, or it can be assembled separately from the housing 20.

[0029] The rotation adjustment mechanism 30 serves as a height adjustment mechanism and includes a lifting frame 31 and a rotating component 32. The lifting frame 31 is fixedly connected to the frame 10 and extends into the accommodating space of the housing 20. The lifting frame 31 can be raised and lowered relative to the frame 10 within the accommodating space. The cutter head assembly 40 is fixedly disposed at the lower end of the lifting frame 31 and can be raised and lowered together with the lifting frame 31.

[0030] The rotating assembly 32 includes an adjusting part and a transmission part, which are connected in a transmission manner. The adjusting part is disposed on the surface of the housing 20, and the transmission part passes through the housing 20 and extends toward the lifting frame 31, and is connected in a transmission manner to the lifting frame 31.

[0031] The adjustment part can drive the transmission part to rotate relative to the housing 20, so that the lifting frame 31 can be raised or lowered.

[0032] The adjustment mechanism can be operated by hand, such as a handwheel, knob, or dial. The adjustment mechanism can also be an acceleration gear set or a reduction gear set.

[0033] The transmission part can be in the form of a shaft, and a bearing or bushing can be installed between it and the housing 20 to ensure that the transmission part rotates flexibly relative to the housing 20. The transmission part can convert its own rotational motion into the lifting motion of the lifting frame 31.

[0034] The transmission part can also be a lead screw. The lifting frame 31 is fixedly provided with a nut. The lead screw rotates to drive the lifting frame 31 to rise or fall.

[0035] The adjusting part and the transmission part can be fitted with bevel gears, which mesh to change the direction of operation. For example, a horizontally set adjusting part (knob) can drive a vertically set transmission part (lead screw) to rotate.

[0036] The rotating assembly 32 is provided with a limiting part 321, which can be provided in the adjusting part or the transmission part.

[0037] The limiting part 321 can be a protrusion provided on the adjusting part or the transmission part and extending radially therein, or, when the adjusting part is a gear, the limiting part 321 can be a notch or a boss.

[0038] The blade assembly 40 may include a drive motor, a blade, and blades that can be detachably connected to the blade. The blade assembly 40 is fixed below the lifting frame 31 and rises and falls synchronously with the lifting frame 31, thereby realizing the adjustment of the mowing height.

[0039] The limiting part 321 and the rotating stop part 21 together constitute a rotation angle limiting structure. When the user rotates the rotating component 32 (adjustment part) in the upward direction, the rotating component 32 drives the lifting frame 31 to rise. When the lifting frame 31 reaches the highest allowable position, the limiting part 321 on the rotating component 32 rotates to a position that abuts against the rotating stop part 21 on the housing 20. At this time, the rotation stroke of the rotating component 32 ends, and the limiting part 321 abuts against the rotating stop part 21, so that the rotating component 32 cannot continue to rotate in the original direction.

[0040] Similarly, when the rotating assembly 32 rotates in the direction that lowers the lifting frame 31, when the lifting frame 31 reaches the lowest permissible position, if there is only one limiting part 321 provided on the rotating assembly 32 and one rotation stop part 21 provided on the housing 20, the other side of the limiting part 321 of the rotating assembly 32 abuts against the other side of the rotation stop part 21 on the housing 20 to prevent the lifting frame 31 from continuing to lower.

[0041] Alternatively, when there is one rotation stop 21 and two limiting parts 321 provided on the rotating assembly 32, spaced apart along the rotation direction, the other limiting part 321 of the rotating assembly 32 abuts against the other side of the same rotation stop 21 to prevent the lifting frame 31 from continuing to lower. Alternatively, when there are two rotation stops 21, spaced apart along the rotation direction of the limiting parts 321, and there is only one limiting part 321 on the rotating assembly 32, the limiting part 321 abuts against the other rotation stop 21 to prevent the lifting frame 31 from continuing to lower.

[0042] In one possible implementation, the rotation stop 21 includes a first stop 211 and a second stop 212, which are spaced apart along the rotation direction of the rotating assembly 32; the limiting part 321 extends between the first stop 211 and the second stop 212 so that the limiting part 321 abuts against the first stop 211 or the second stop 212 when it rotates to its limit position.

[0043] Understandably, in this embodiment, the rotation stop 21 includes a first stop 211 and a second stop 212 spaced apart along the rotation direction of the rotation assembly 32, and the limiting part 321 on the rotation assembly 32 is one, so that the limiting part 321 can rotate within the angle range defined by the first stop 211 and the second stop 212, and the angle range can be 45°-260°.

[0044] The first stop 211 and the second stop 212 are fixed to the housing 20 and can be detachably set on the surface of the housing 20, so as to flexibly adjust the range of the limiting member and can be integrally formed with the housing 20.

[0045] The first stop 211 and the second stop 212 are spaced apart along the circular motion trajectory of the adjusting part or the rotating part when they rotate.

[0046] Since the limiting part 321 extends between the first stop part 211 and the second stop part 212, when the user operates the rotating component 32 to rotate, the limiting part 321 rotates synchronously, and the range of motion of the limiting part 321 is limited between the first stop part 211 and the second stop part 212.

[0047] Specifically, when the lifting frame 31 is raised, the rotating component 32 drives the limiting part 321 to rotate toward the first stop part 211. When the cutter head is raised to the preset highest position, the limiting part 321 just contacts and abuts against the first stop part 211, so that the rotating component 32 cannot continue to rotate in the same direction. When the user's hand is turning the adjustment part, he can clearly feel the obstruction of the first stop part 211.

[0048] When rotating in the reverse direction, the limiting part 321 moves away from the first stop part 211 and rotates toward the second stop part 212. When the cutter head descends to the preset lowest position, the limiting part 321 abuts against the second stop part 212, allowing the user to clearly perceive the rotation limit of the rotating assembly 32, thereby avoiding over-rotation and damage to related rotating parts. In one possible implementation, the limiting part 321 is a protrusion, which is disposed on the outer peripheral wall of the rotating assembly 32 and extends radially away from the rotating assembly 32. Both the first stop 211 and the second stop 212 are protruding structures provided on the surface of the housing 20, and the first stop 211 and the second stop 212 are located on the outer periphery of the rotating assembly 32.

[0049] Understandably, the protrusion is fixedly set on the outer peripheral wall of the rotating component 32 and extends radially. The protrusion can be set on the outer peripheral wall of the transmission part or on the outer peripheral wall of the adjustment part. The first stop 211 and the second stop 212 are protruding structures provided on the surface of the housing 20. These protruding structures can be provided on the outer surface of the housing 20 or on the inner wall surface of the housing 20. The protruding structures can be integrally formed blocks or cast ribs with the housing 20, or they can be later-installed positioning pins, screws, or baffles. The first stop 211 and the second stop 212 are arranged at intervals along the rotation direction of the rotating assembly 32, forming a fan-shaped area that allows the protrusion (limiting part 321) to move between the two protruding structures. The first stop 211 and the second stop 212 are located on the outer periphery of the rotating assembly 32, that is, outside the annular trajectory swept by the protrusion as the rotating assembly 32 rotates. The first stop 211 and the second stop 212 maintain a preset interval angle in the circumferential direction.

[0050] In one possible implementation, the rotating assembly 32 includes a rotating member 322 rotatably disposed in the housing 20 and extending through the housing 20 into the receiving space for connection with the lifting frame 31.

[0051] Understandably, the rotating component 322 can serve as the transmission part of the rotating assembly 32. The end of the rotating component 322 is located outside the housing 20 for connection of the adjustment part to receive the torque of the adjustment part.

[0052] The adjustment component can be a handwheel or knob, etc., fixed to the end of the rotating part 322 located outside the housing 20, or the adjustment component can be connected to the rotating part 322 through a reversing transmission pair (bevel gear, etc.), so that the user can drive the rotating part 322 to rotate by operating the adjustment component.

[0053] The main body of the rotating component 322 extends into the housing 20 and is connected to the lifting frame 31 via a transmission connection. The rotating component 322 can rotate freely relative to the housing 20 around its own axis. The rotation of the rotating component 322 can be converted into the lifting motion of the lifting frame 31, which can be achieved through a threaded pair. For example, the transmission component has an external thread, and the transmission component passes through an internal threaded hole opened on the lifting frame 31.

[0054] The limiting part 321 (protrusion) can be provided on the outer peripheral wall of the rotating member 322 and extend radially. Two circumferentially spaced protrusions are provided on the housing 20 at corresponding positions and located on the outer peripheral side of the rotating member 322. The limiting part 321 (protrusion) extends between the two protrusions. When the rotating member 322 rotates, the rotation trajectory of the limiting part 321 is limited between the two protrusions on the housing 20.

[0055] It should be noted that the protrusion can be provided at the end of the rotating member 322 located outside the housing 20, or it can be provided on the main body of the rotating member 322 extending into the housing 20.

[0056] In one possible implementation, the outer peripheral wall of the rotating member 322 is provided with a helical boss 3221, the helical boss 3221 is placed in the receiving space, and a helical guide surface 3221a is provided on the surface of the helical boss 3221. The lifting frame 31 has a lifting part 311, which abuts against the spiral guide surface 3221a. The rotating member 322 rotates so that the spiral guide surface 3221a drives the lifting part 311 to lift the lifting frame 31.

[0057] Understandably, the rotating component 322 extends into the outer peripheral wall of the main body within the housing 20 and is provided with a spiral boss 3221. The spiral boss 3221 spirals upward along the outer peripheral wall of the rotating component 322 and along the axial direction of the rotating component 322. The spiral guide surface 3221a is a continuous curved surface spiraling upward from the bottom (root) to the top of the rotating component 322. The lifting frame 31 has a lifting part 311. The lifting part 311 abuts against the spiral guide surface 3221a. When rotating in the forward direction (clockwise), the spiral guide surface 3221a rotates synchronously with the rotating component 322. Due to its own axial tilt angle (slope), it will push the lifting part 311 to climb upward along the spiral slope while moving in the circumferential direction, thereby driving the entire lifting frame 31 and the cutter head assembly 40 to rise.

[0058] When rotating in the opposite direction (counterclockwise), the lifting frame 31 and the cutter head assembly 40 are under the action of gravity, so that the lifting part 311 always abuts against the spiral guide surface 3221a, and thus falls downward along the axis of the rotating part 322 along the spiral guide surface 3221a, so that the lifting frame 31 carries the cutter head assembly 40 down.

[0059] The lifting part 311 can be made of metal and is spherical in shape. The spherical surface abuts against the spiral guide surface 3221a to reduce the contact area, reduce friction, and reduce wear on the lifting part 311, thereby extending its service life.

[0060] Since the spiral boss 3221 has an open structure and the threaded guide surface is in point contact with the lifting part 311 of the lifting frame 31, even if foreign objects such as mud and grass are stuck, they can be easily squeezed out by the rotation.

[0061] Furthermore, the lifting frame 31 includes a base, a suspension frame, and a cutter head assembly 23. The base can be fixedly connected to the frame 10 by bolts, and the base is set in the accommodating space of the housing 20. The base body is provided with two hinge seats and one assembly seat, which are spaced apart from each other. The assembly seat is set between the two hinge seats. The assembly seat is cylindrical. The rotating part 322 is sleeved on the assembly seat and can rotate freely around the axis of the assembly seat. The two can be clearance fit, or the rotating part 322 can be flexibly rotated relative to the assembly seat through bearing fit.

[0062] The first end of the suspension frame is hinged to two hinge seats, and the second end of the suspension frame is provided with a cutter head assembly part 23, which is used to assemble the cutter head assembly 40.

[0063] The cutter head assembly 23 includes an assembly frame, which is an open-top receiving structure. The assembly frame is used to assemble the cutter head assembly 40. The drive motor of the cutter head assembly 40 is located inside the assembly frame. The output end of the drive motor passes through the bottom of the assembly frame and extends out of the assembly frame to connect with the cutter head. Starting the drive motor can drive the cutter head to rotate.

[0064] The assembly frame has hinges on both sides, and the hinges on both sides of the assembly frame correspond to two hinge seats on the base body. The second end of the suspended frame is hinged to the hinges on both sides of the assembly frame.

[0065] The lifting part 311 is located near the first end of the suspension frame, and can be located at the bottom of the suspension frame. The lifting part 311 is a hemispherical component, and its spherical surface abuts against the helical guide surface 3221a. Under the gravity of the suspension frame and the cutter head assembly 40, the lifting part 311 is always in contact with the helical guide surface 3221a. Furthermore, since the first end of the suspension frame is hinged to the base and the second end is a free end, when the rotating member 322 rotates to drive the lifting part 311 to rise and fall along the axial direction of the rotating member 322, the second end of the suspension frame also drives the cutter head assembly 23 to rise and fall together.

[0066] In one possible implementation, the rotating assembly 32 further includes a gear set, at least one gear in the gear set having a toothed section and a toothless section, the toothed section being used for meshing transmission and the toothless section being used for stopping transmission.

[0067] Understandably, the gear set, as the adjusting part of the rotating component 32, may contain two or more gears, such as a driving gear 323, a driven gear 324, and an idler gear between them. The driving gear 323 may be connected to a handwheel or knob for user adjustment. Each gear in the gear set is rotatably mounted on the housing 20, and adjacent gears are meshed together.

[0068] The outer circumferential wall of the gear in the gear set has toothed sections and toothless sections. The toothed sections have several teeth distributed on the outer circumference within a certain circumferential angle range of the gear, which are used to mesh normally with other gears and transmit torque. The toothless sections, within the remaining angular range of the gear, do not have teeth machined, but instead form arc surfaces, planes, and boss surfaces, so that the toothless sections cannot mesh with other gears to stop the continuous rotation of the gear assembly.

[0069] Among them, any one or more of the driving gear 323, driven gear 324, or toothed gear may be provided with a toothless section.

[0070] When the user turns the handwheel or knob, causing the drive gear 323 to rotate, the drive gear 323 meshes with the teeth of other gears to transmit torque, driving the rotating component 322 to rotate and thus adjusting the lifting frame 31. When the cutter head assembly 40 reaches its highest or lowest position, the toothless section of the gear contacts the teeth of other gears. Since the toothless section has no teeth, it cannot mesh with other gears, and the transmission fails. Even if the drive gear 323 continues to rotate, it will not continue to transmit torque to the lifting frame 31, so that the gear teeth, the threads of the transmission part, or the helical guide surface 3221a, etc., will no longer bear overload torque and avoid damage.

[0071] More specifically, when the lifting part 311 of the lifting frame 31 reaches the end of the spiral guide surface 3221a, that is, when the lifting frame 31 reaches the highest or lowest position, the spiral guide surface 3221a will not continue to rotate to drive the lifting part 311 to rise and fall axially, so as to avoid the lifting part 311 from dislodging from the spiral guide surface 3221a, which would cause the transmission between the rotating component 32 and the lifting frame 31 to fail.

[0072] In one possible implementation, the gear assembly includes a driving gear 323 and a driven gear 324, both of which are disposed on the surface of the housing 20. The outer peripheral wall of the driving gear 323 is provided with a first toothless section 3231 and a first toothed section 3232. The first toothed section 3232 meshes with the driven gear 324 for transmission. The driven gear 324 is connected to the transmission component. The limiting part 321 is provided on the first toothless section 3231 and extends radially along the driving gear 323.

[0073] Understandably, the gear assembly mainly includes a driving gear 323 and a driven gear 324. Both the driving gear 323 and the driven gear 324 are located on the outer surface of the housing 20 and can rotate stably on the outer surface of the housing 20. The user drives the driving gear 323 to rotate by driving the knob located on the driving gear 323, which transmits torque to the driven gear 324, thereby causing the transmission component connected to the driven gear 324 to rotate and adjust the lifting frame 31.

[0074] The drive gear 323 has teeth in a portion of its outer circumferential angle, forming a first tooth segment 3232 for meshing with the driven gear 324. The other portion of its circumferential angle is un-toothed, forming a first toothless segment 3231. The first toothless segment 3231 can be a boss, and the outer wall of the boss can be an arc surface or a plane. The first toothless segment 3231 is also provided with a limiting part 321, which extends radially along the drive gear 323 for abutting against the rotation stop part 21. For example, the limiting part 321 extends between the first stop part 211 and the second stop part 212. When the lifting frame 31 drives the cutter head assembly 40 to the highest or lowest position, the limiting part 321 abuts against the first stop part 211 or the second stop part 212 respectively, allowing the user to clearly perceive the adjustment limit of the adjustment component.

[0075] In one possible implementation, the driven gear 324 is provided with a first mating part 3241, and the rotating member 322 is provided with a second mating part 3222 corresponding to the first mating part 3241; the driven gear 324 is mounted on the rotating member 322, and the first mating part 3241 and the second mating part 3222 correspond to each other, so as to define the relative position of the driven gear 324 and the rotating member 322.

[0076] Understandably, the driven gear 324 and the rotating member 322 are connected at the ends of the housing 20 outside. At the connection position, a first mating part and a second mating part 3222 are respectively provided, wherein the first mating part 3241 and the second mating part 3222 have complementary shapes.

[0077] For example, the driven gear 324 is sleeved on the end of the rotating member 322. The first mating part 3241 can be a non-circular profile D-shaped hole, spline hole, etc. on the inner wall of the driven gear 324. The corresponding second mating part 3222 on the rotating member 322 can be a D-shaped shaft segment, spline shaft, etc. provided on the outer wall of the rotating member 322 and extending axially.

[0078] Driven gear 324 can be connected to the end face of rotating member 322. The first mating part 3241 can be an eccentric through hole formed on the surface of driven gear 324. The corresponding second mating part 3222 can be a protrusion provided on the end face of rotating member 322 and extending axially, which can be inserted into the through hole to fit together. The first mating part 3241 and the second mating part 3222 can define the circumferential relative position between driven gear 324 and rotating member 322, so that the rotation angle of driving gear 323 can be accurately transmitted to rotating member 322 through driven gear 324, so that helical guide surface 3221a can accurately drive lifting frame 31 to rise and fall.

[0079] In one possible implementation, the driven gear 324 has a second toothed segment 3242 and a second toothless segment 3243 on its outer peripheral wall. The second toothed segment 3242 is used for meshing transmission with the first toothed segment 3232. The second toothless segment 3243 has a positioning notch 3243a. The surface of the housing 20 has a positioning part 22 corresponding to the positioning notch 3243a. The positioning notch 3243a and the positioning part 22 are shaped to match. The driven gear 324 is matched and assembled with the positioning part 22 through the positioning notch 3243a.

[0080] Understandably, the driven gear 324 has a second toothed section 3242 and a second toothless section 3243 on its outer peripheral wall. The second toothed section 3242 has a number of teeth distributed within a certain circumferential angle range of the driven gear 324, which are used to mesh with the first toothed section 3232 of the driving gear 323 and receive the torque transmitted by the driving gear 323. The second toothless section 3243 has no teeth machined within another certain circumferential angle range. The second toothless section 3243 can be a boss on the outer peripheral wall of the driven gear 324. A positioning notch 3243a is machined in the second toothless section 3243. The positioning notch 3243a extends from the outer edge of the second toothless section 3243 in the form of a notch or a groove towards the axis of the driven gear 324 along the radial direction of the second gear.

[0081] A positioning part 22 is provided on the surface of the housing 20 in the area for mounting the driven gear 324, at a position corresponding to the positioning notch 3243a. The positioning part 22 can be a groove whose shape matches the contour shape of the positioning notch 3243a.

[0082] During assembly, the drive gear 323 is pre-assembled on the surface of the housing 20, and the limiting part 321 of the drive gear 323 abuts against the rotation stop part 21, so that the drive gear 323 is at the rotation limit in a specific direction (clockwise or counterclockwise). The rotating component 322 is inserted through the housing 20 from inside the receiving space, so that the end of the rotating component 322 is placed outside the housing 20. At this time, the rotating component 322 can rotate freely and is in the assembly state. The driven gear 324 is assembled by aligning its positioning notch 3243a with the positioning portion 22 on the surface of the housing 20. At this point, the driven gear 324 serves as a reference and remains stationary. The rotating member 322 is then adjusted by rotation so that its second mating portion 3222 aligns with the first mating portion 3241 of the driven gear 324. The driven gear 324 is then assembled and connected to the rotating member 322, with the teeth of its second tooth segment 3242 meshing with the teeth of the first tooth segment 3232 of the driving gear 323. This assembly defines the circumferential relative position of the rotating member 322 and the driving gear 323, thereby defining the position of the helical guide surface 3221a on the rotating member 322 relative to the lifting portion 311, and thus determining the position of the lifting frame 31.

[0083] Since the limiting part 321 of the drive gear 323 abuts against the rotating stop part 21, the limiting part 321 can abut against the first stop part 211 or the second stop part 212. After assembly, the lifting part 311 is located at the highest or lowest position of the spiral guide surface 3221a of the rotating part 322, thereby establishing an initial reference for adjustment with the lifting frame 31, and the ground clearance of the cutter head assembly 40 can be precisely adjusted.

[0084] Specifically, since the driving gear 323 is forced to remain at its rotational limit (the limiting part 321 abuts against the first stop part 211 or the second stop part 212), and the driven gear 324 is circumferentially locked by the matching of the positioning notch 3243a and the positioning part 22 of the housing 20, the circumferential angle of the driven gear 324 is uniquely determined after the driving gear 323 and the driven gear 324 mesh in the tooth segment. The rotating member 322 is assembled with the first mating part 3241 of the driven gear 324 through the second mating part 3222, therefore the initial circumferential angle of the rotating member 322 relative to the housing 20 is also uniquely determined. At this point, the circumferential relative positional relationship of the driving gear 323, driven gear 324, and rotating component 322 is precisely fixed. Since the circumferential angle of the rotating component 322 is determined, the starting position of the spiral guide surface 3221a set on it is determined. Since the lifting part 311 of the lifting frame 31 always abuts against the spiral guide surface 3221a, the abutting position of the lifting part 311 on the spiral guide surface 3221a at this time corresponds exactly to the highest or lowest position of the lifting frame 31, so that the highest or lowest position corresponds to the abutting position of the limiting part 321 of the driving gear 323 against the first stop part 211 or the second stop part 212.

[0085] For example, during assembly, the limiting part 321 of the drive gear 323 abuts against the first stop part 211, and the cutter head assembly 40 is at one end of its stroke. When the drive gear 323 rotates in the opposite direction, causing the limiting part 321 to abut against the second stop part 212, the helical guide surface 3221a rotates with the rotating part 322, pushing the lifting part 311 to another end of its stroke. The heights of the cutter head assembly 40 corresponding to the two end points of the stroke are the highest and lowest positions, eliminating the need for readjustment after assembly.

[0086] Furthermore, the rotating part 322 is aligned and assembled with the first mating part 3241 of the driven gear 324 through the second mating part 3222. The starting position of its helical guide surface 3221a does not need to rely on manual tooth alignment or visual alignment, thereby eliminating the error caused by the circumferential assembly of multi-stage gear transmission and helical fit.

[0087] In one possible implementation, the housing 20 has an assembly portion 23 on its surface, the assembly portion 23 is arranged around the outer periphery of the gear assembly, the gear set is assembled in the assembly portion 23, and the rotation stop portion 21 is provided on the inner wall of the assembly portion 23. The assembly part 23 is also provided with a mounting base 24, and the drive gear 323 is sleeved on the mounting base 24. The drive gear 323 can rotate around the axis of the mounting base 24.

[0088] Understandably, the assembly part 23 is an enclosing structure surrounding the outer periphery of the gear assembly. The assembly part 23 is used to provide enclosure protection for the gear assembly and to provide a mounting base for the rotation stop part 21.

[0089] The assembly part 23 can be a wall or barrier protruding from the surface of the housing 20, or it can be a groove formed by recessing downward from the surface of the housing 20, with the inner wall of the groove enclosing the gear assembly. The inner contour of the assembly part 23 corresponds to the outer contour of the gear assembly.

[0090] The rotation stop 21 (first stop 211 and second stop) can be a block or baffle that protrudes from the inner peripheral wall of the assembly part 23 and extends toward the gear assembly.

[0091] Since the assembly part 23 is arranged around the outer periphery of the gear assembly, the first stop part 211 and the second stop part 212 are located on the rotation trajectory of the limiting part 321 of the driving gear 323. The limiting part 321 rotates within the annular space between the inner wall of the assembly part 23 and the outer periphery of the gear, and when it reaches the rotation limit, it abuts against the corresponding first stop part 211 or second stop part 212. The first stop part 211 and the second stop part 212 limit the rotation angle of the driving gear 323 to between 45° and 260°.

[0092] The assembly section 23 also includes a mounting section for assembling the drive gear 323. The mounting base 24 can be a cylindrical boss, bushing, or bearing seat integrally formed on the housing 20. The drive gear 323 is assembled onto the mounting base 24 through a center hole or annular groove. The drive gear 323 and the mounting base 24 can be clearance-fitted or connected via bearings, allowing the drive gear 323 to rotate freely around the mounting base 24. The mounting base 24 provides stable positioning for the assembly of the drive gear 323, ensuring a stable meshing center distance between the drive gear 323 and the driven gear 324.

[0093] In one possible implementation, a top cover 50 is also included, which is installed correspondingly to the mounting portion 23 to cover the gear assembly, and the top cover 50 is connected to the housing 20.

[0094] Understandably, the top cover 50 is detachably assembled with the housing 20. The shape and size of the top cover 50 correspond to the mounting part 23 on the housing 20. The mounting part 23 is an enclosing structure, such as a wall or cavity, surrounding the outer periphery of the gear assembly. The top cover 50 covers the open side of the mounting part 23, enclosing the entire gear assembly within the space formed by the mounting part 23 and the top cover 50.

[0095] The top cover 50 and the housing 20 can be connected by screws. The top cover 50 has screw through holes on its edge, and the housing 20 has threaded holes at corresponding positions. The two are connected by tightening screws.

[0096] The top cover 50 and the housing 20 can also be connected by a snap-fit ​​mechanism. The top cover 50 has elastic snaps on its edge, and the housing 20 has corresponding slots. The top cover 50 can be snapped into place with the housing 20 by pressing it down. The top cover 50 encloses the gear assembly within the assembly section 23, effectively preventing foreign objects from entering the meshing area, reducing tooth surface wear and foreign object jamming, and extending gear life.

[0097] In one possible implementation, it also includes: a knob 60, which is rotatably connected to the upper cover 50 and extends from the outside of the upper cover 50 into the upper cover 50 and is fixedly connected to the drive gear 323. A guide cylinder 3233 is provided on the surface of the drive gear 323 facing the upper cover 50, and the guide cylinder 3233 extends towards the upper cover 50; The guide cylinder 3233 is also equipped with an elastic element 70 and a hand-feel wheel 80; The elastic element 70 is sleeved on the outside of the guide cylinder 3233, and the hand-feel wheel 80 is located at the end of the guide cylinder 3233 facing the upper cover 50; The guide cylinder 3233 is provided with a first guide limiting part 3233a, and the hand-feel wheel 80 is provided with a second guide limiting part 81. The first guide limiting part 3233a and the second guide limiting part 81 correspond to each other so that the hand-feel wheel 80 can move along the axial direction of the guide cylinder 3233 and can rotate with the drive gear 323. One end of the elastic element 70 abuts against the drive gear 323, and the other end abuts against the hand-feel wheel 80, so that the hand-feel wheel 80 abuts against the upper cover 50; The upper cover 50 and the surface opposite the hand wheel 80 are respectively provided with a triggering part 82 and a response part 51. The hand wheel 80 can rotate with the drive gear 323 so that the response part 51 rotates relative to the triggering part 82 to produce a sound.

[0098] Understandably, the knob 60 is located on the outside of the upper cover 50 for user hand operation. The rotating shaft 61 of the knob extends through the through hole of the upper cover 50 into the interior of the upper cover 50 and is fixedly connected to the drive gear 323 by a snap-fit ​​connection. The end of the rotating shaft 61 of the knob has two claws 611, which are spaced apart and opposite to each other. The drive gear 323 has a hollow center with a rectangular mounting hole, and two bosses are spaced apart and opposite to each other in the mounting hole. The rotating shaft 61 passes through the mounting hole, and the two claws 611 engage with the two bosses respectively.

[0099] To further limit the position, a protruding ridge is provided on the outer side wall of the rotating shaft 61 along the axial direction, and a groove is provided at the corresponding position on the inner wall of the mounting hole. The protruding ridge is embedded in the groove to limit and fix the two, so that the drive gear 323 can rotate synchronously with the knob 60.

[0100] The center of the hand-feel wheel 80 is hollowed out to allow the shaft 61 of the twisting component to pass through. The guide cylinder 3233 is located on the outer periphery of the mounting hole. The guide cylinder 3233 has a hollow structure and its interior is connected to the mounting hole. The shaft 61 of the twisting component passes through the hollow part of the hand-feel wheel 80 and the hollow structure of the guide cylinder 3233 in sequence, and finally extends into the mounting hole of the drive gear 323.

[0101] The hand-feel wheel 80 is located at the end of the guide cylinder 3233 facing the upper cover 50, and the end of the guide cylinder 3233 is provided with a first guide limiting part 3233a, and the hand-feel wheel 80 is provided with a second guide limiting part 81, and the two are assembled accordingly.

[0102] The first guide limiting part 3233a can be a guide post, wherein the number of guide posts can be multiple, for example, three or four, and they are arranged at intervals along the circumference of the guide cylinder 3233. Correspondingly, the second guide limiting part 81 is a guide through hole opened on the surface of the hand feel wheel 80, and the number, shape and setting position of the guide through hole are all corresponding to the guide post.

[0103] After the hand-feed wheel 80 is assembled with the first guide limit part 3233a of the drive gear 323 via the second guide limit part 81, it can restrict the axial rotation of the hand-feed wheel 80 relative to the drive gear 323, so that the hand-feed wheel 80 rotates synchronously with the drive gear 323, and the hand-feed wheel 80 can reciprocate axially relative to the drive gear 323.

[0104] An elastic element 70 is sleeved on the outer periphery of the guide cylinder 3233. The elastic element 70 can be a coil spring, elastic rubber, etc. One end of the elastic element 70 abuts against the surface of the drive gear 323, and the other end abuts against the lower end face of the hand-feel wheel 80. Furthermore, the elastic element 70 always applies an upward axial thrust to the hand-feel wheel 80, so that the top end face of the hand-feel wheel 80 maintains elastic contact with the inner surface of the upper cover 50.

[0105] The surface of the top cover 50 opposite to the feel wheel 80 (i.e., the area on the inner surface of the top cover 50 directly opposite the feel wheel 80) is provided with a response part 51 and a touch part 82.

[0106] The actuating part 82 consists of multiple raised structures distributed around the circumference of the hand-feel wheel 80, forming a wave-shaped cam surface; The response unit 51 is a structure with multiple grooves on the top inner wall of the housing 20 that cooperate with the touch unit 82. When the hand wheel 80 rotates with the drive gear 323, the touch unit 82 moves relative to the response unit 51, which can generate sound and tactile feedback.

[0107] For example, when the raised structure slides into the grooved structure, it produces an impact sound, and at the same time, the elastic element 70 slightly moves the feel wheel 80 axially, creating a jerky feel.

[0108] When the cutter head is adjusted to its highest or lowest limit position, the limiting part 321 of the drive gear 323 abuts against the stop part of the housing 20, and the knob 60 can no longer be rotated. At this time, the sound feedback naturally stops, and the sound disappears and the knob locks when the limit is reached, so that the user can clearly feel that the adjustment limit has been reached.

[0109] In the description of the embodiments of this application, it should be noted that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the embodiments of this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the embodiments of this application. In addition, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0110] In the description of the embodiments of this application, it should be noted that, unless otherwise explicitly specified and limited, the terms "connected" and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in the embodiments of this application based on the specific circumstances.

[0111] In the embodiments of this application, unless otherwise expressly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0112] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of the embodiments 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. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0113] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this application.

Claims

1. A lawnmower, characterized in that, include: Frame; A housing, disposed on the vehicle frame, the housing having an accommodating space; A rotary adjustment mechanism includes a lifting frame and a rotary assembly, wherein the rotary assembly is throttle-connected to the lifting frame, and the rotary assembly adjusts the lifting height of the lifting frame by rotating. A cutter head assembly is disposed on the lifting frame, and the cutter head assembly moves up and down synchronously with the lifting frame; The lifting frame is connected to the vehicle frame and is disposed within the housing's accommodating space. The rotating component is disposed in the housing and has a limiting part. The housing has a rotation stop part. The limiting part and the rotation stop part cooperate to limit the rotation angle of the rotating component.

2. The lawnmower according to claim 1, characterized in that, The rotation stop includes a first stop and a second stop, and the first stop and the second stop are spaced apart along the rotation direction of the rotating assembly. The limiting portion extends between the first stop portion and the second stop portion, so that when the limiting portion is rotated to the limit position, it abuts against the first stop portion or the second stop portion.

3. The lawnmower according to claim 2, characterized in that, The limiting part is a protrusion, which is disposed on the outer peripheral wall of the rotating assembly and extends radially away from the rotating assembly. Both the first stop and the second stop are protruding structures provided on the surface of the housing, and the first stop and the second stop are located on the outer periphery of the rotating assembly.

4. The lawnmower according to claim 2, characterized in that, The rotating assembly includes a rotating member rotatably disposed on the housing, and the rotating member extends through the housing and into the receiving space for connection with the lifting frame.

5. The lawnmower according to claim 4, characterized in that, The outer peripheral wall of the rotating component is provided with a spiral boss, the spiral boss is placed in the receiving space, and a spiral guide surface is provided on the surface of the spiral boss; The lifting frame has a lifting part that abuts against the spiral guide surface. The rotating component rotates to cause the spiral guide surface to drive the lifting part to lift the lifting frame.

6. The lawnmower according to claim 4, characterized in that, The rotating assembly further includes a gear set, at least one gear in the gear set having a toothed section and a toothless section, the toothed section being used for meshing transmission and the toothless section being used for stopping transmission.

7. The lawnmower according to claim 6, characterized in that, The gear assembly includes a driving gear and a driven gear, both of which are disposed on the surface of the housing; The outer peripheral wall of the driving gear is provided with a first toothless section and a first toothed section. The first toothed section meshes with the driven gear for transmission. The driven gear is connected to the transmission component. The limiting part is provided in the first toothless section and extends radially along the driving gear.

8. The lawnmower according to claim 7, characterized in that, The driven gear is provided with a first mating part, and the rotating member is provided with a second mating part corresponding to the first mating part; The driven gear is mounted on the rotating member, and the first mating part corresponds to the second mating part, so as to define the relative position of the driven gear and the rotating member.

9. The lawnmower according to claim 7, characterized in that, The driven gear has a second toothed section and a second toothless section on its outer peripheral wall. The second toothed section is used for meshing and transmission with the first toothed section. The second toothless section has a positioning notch. The housing surface has a positioning part corresponding to the positioning notch. The positioning notch and the positioning part are shaped to match. The driven gear is matched and assembled with the positioning part through the positioning notch.

10. The lawnmower according to claim 7, characterized in that, The housing surface is provided with an assembly part, which is arranged around the outer periphery of the gear assembly. The gear set is assembled inside the assembly part, and the rotation stop is provided on the inner wall of the assembly part. The assembly part is also provided with a mounting base, and the drive gear is sleeved on the mounting base. The drive gear can rotate around the axis of the mounting base.

11. The lawnmower according to claim 10, characterized in that, Also includes: The top cover is installed corresponding to the assembly part to cover the gear assembly, and the top cover is connected to the housing.

12. The lawnmower according to claim 11, characterized in that, Also includes: A knob is rotatably connected to the upper cover and extends from the outside of the upper cover into the upper cover and is fixedly connected to the drive gear; The surface of the drive gear facing the upper cover is provided with a guide cylinder, and the guide cylinder extends toward the upper cover. The guide cylinder is also equipped with an elastic element and a hand-feel wheel; The elastic element is sleeved on the outside of the guide cylinder, and the hand-feel wheel is located at the end of the guide cylinder facing the upper cover; The guide cylinder is provided with a first guide limiting part, and the hand-feel wheel is provided with a second guide limiting part. The first guide limiting part and the second guide limiting part correspond to each other so that the hand-feel wheel can move along the axial direction of the guide cylinder and can rotate with the drive gear. One end of the elastic element abuts against the drive gear, and the other end abuts against the hand-feel wheel, so that the hand-feel wheel abuts against the top cover; The upper cover and the surface opposite the hand-feel wheel are respectively provided with a touch part and a response part. The hand-feel wheel can rotate with the drive gear so that the response part rotates relative to the touch part to produce a sound.

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