Mowing machine and mowing height adjusting method thereof

Abstract

The invention relates to a mowing machine. The mowing machine comprises a machine shell, a front wheel assembly, a rear wheel assembly, a cutting mechanism and a height adjusting mechanism. The connecting rod assembly comprises a front connecting rod and a rear connecting rod which are connected in a hinged mode, the front connecting rod is rotationally connected with a front triangular block through a first shaft, and the rear connecting rod is rotationally connected with a rear triangular block through a second shaft. The handle assembly comprises a connecting base, a gear shifting base, a gear shifting handle and a gear pin, the gear shifting base is fixedly connected with the machine shell, the gear shifting base is provided with a sliding groove and a plurality of gear grooves, and the front connecting rod and the rear connecting rod are hinged to the connecting base through a fourth shaft. The gear shifting handle slides along the sliding groove and drives the connecting base to rotate, the connecting rod assembly drives the front triangular block and the rear triangular block to rotate, the height of the cutting plane of the cutting mechanism is adjusted, and the gear pins are connected to the corresponding gear grooves in a clamped mode. The handle assembly adopts a lever structure to amplify the lifting force, the swinging force required by a user is small, the operation is convenient, and the use experience of the user is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of lawn mowing, and in particular to a lawn mower and a method for adjusting the lawn mowing height thereof. Background Art

[0002] As an essential tool for lawn care, a push mower boasts high mowing efficiency and a high, even cutting height. The mower's cutting height is adjustable, and the key to adjusting the height is changing the vertical distance between the cutter disc and the ground to suit the mowing requirements of different lawns.

[0003] For example, the publication CN 220606606 U provides a height adjustment mechanism for a lawn mower and the lawn mower itself. The height adjustment mechanism includes a drive unit, disposed on one side of the lifting handle and mounted on the chassis via a first elastic component, having a limiting protrusion that engages with a circumferentially provided limiting recess on the swing arm axle; and a coupling unit, each end of which is connected to the two swing arm axles, enabling synchronous movement of the swing arm shafts.

[0004] And the public document with the publication number CN 200956732Y provides a height adjustment locking device for a lawn mower.

[0005] Existing height adjustment mechanisms for lawn mowers require the user to lift the mower to the desired height, with the wheels in contact with the ground. The height is then locked using a locking mechanism. This adjustment process not only requires the user to lift the entire mower, but the height adjustment mechanism also works with the swing arm axle of the wheels to lock the mowing height. This height adjustment process requires a significant amount of force from the user, resulting in a poor user experience.

[0006] Another lawn mower height adjustment mechanism involves flipping the height handle to the left to unlock it; then rotating it back and forth to adjust it to the desired position; then flipping the handle to the right to lock it in the exposed gear slot. Technical issues with this mechanism include: 1. Improperly finished metal slot edges can create sharp edges that can easily scratch the user. 2. The gear slot is large, making it susceptible to dirt. 3. Unlocking and locking the handle is cumbersome. 4. It is noisy; the adjustment lever and gear slot are made of metal, producing a harsh noise when they collide. Summary of the Invention

[0007] To overcome the problems existing in the related art, an embodiment of the present invention provides a lawn mower and a method for adjusting the mowing height thereof, so as to solve the technical problems that the height adjustment process requires a large lifting force from the user and the handle is inconvenient to operate.

[0008] According to a first aspect of an embodiment of the present invention, a lawn mower is provided, comprising a housing, a front wheel assembly mounted on the housing, a rear wheel assembly, a cutting mechanism, and a height adjustment mechanism, wherein the height adjustment mechanism comprises: A connecting rod assembly comprising a front connecting rod and a rear connecting rod that are hingedly connected, wherein the front connecting rod is rotatably connected to a front triangular block of the front wheel assembly via a first shaft, the first shaft being eccentrically disposed to the front wheel axle of the front wheel assembly, and the rear connecting rod is rotatably connected to a rear triangular block of the rear wheel assembly via a second shaft, the second shaft being eccentrically disposed to the rear wheel axle of the rear wheel assembly; A handle assembly includes a connecting base, a shift base, a shift handle, and a shift pin slidably mounted on the shift handle, wherein the shift base is fixedly connected to the housing, the shift base is provided with a sliding slot and a plurality of shift slots, the shift handle passes through the sliding slot and is fixedly connected to the connecting base, the connecting base and the housing are hingedly connected via a third axis, the front connecting rod and the rear connecting rod are respectively hingedly connected to the connecting base via a fourth axis, and the fourth axis is located above the third axis; The shift handle slides along the sliding groove and drives the connecting seat to rotate, the connecting rod assembly drives the front triangle block and the rear triangle block to rotate, adjusts the cutting plane height of the cutting mechanism, and the gear pin is clamped to the corresponding gear groove.

[0009] In one embodiment, the notch of the shift slot faces the connecting seat and is arranged on the inner arc surface of the shift seat with the third axis as the axis, and the shift pin is slidably buckled into the shift slot.

[0010] In one embodiment, the shift handle includes a handle rod, a movable rod sliding on the handle rod, and an elastic member located in the handle rod. The shift pin passes through the handle rod, and the elastic member elastically pushes the shift pin to slide against the movable rod.

[0011] In one embodiment, the shift handle includes a movable roller installed on the movable rod, a handle cover fixed to the handle rod, and an unlocking block sliding on the handle cover, the sliding direction of the unlocking block intersects with the movable direction of the movable rod, and the unlocking block is provided with a slope, which slides against the movable roller.

[0012] In one embodiment, the shift handle includes a support frame installed on the movable rod, the support frame is provided with a deformation opening, and the movable roller is buckled into the deformation opening through a pin and connected to the support frame.

[0013] In one embodiment, the handle assembly also includes an elastic rubber strip adhered to the surface of the shift seat, the elastic rubber strip is provided with a through dustproof pattern, the dustproof pattern includes straight lines parallel to the sliding groove and extended lines distributed on both sides of the straight lines, and the shift handle passes through the dustproof pattern.

[0014] In one embodiment, in a projection in a horizontal plane direction, the front wheel axle is located between the fourth axis and the first axis, and the second axis is located between the rear wheel axle and the fourth axis.

[0015] In one embodiment, the front triangular block is provided with a snap-in slot and a rotation hole, the rotation hole is located at the top corner, the snap-in slot is located on the opposite side of the top corner, the front wheel axle is provided with a front swing arm shaft, the front swing arm shaft is embedded in the snap-in slot, and the first shaft is connected to the rotation hole.

[0016] In one embodiment, the handle assembly is located on one side of the housing, and the rotation centerline of the cutting mechanism intersects with the centerline of the shift seat.

[0017] According to a second aspect of an embodiment of the present invention, a method for adjusting the cutting height of a lawn mower is provided, including the lawn mower as described above. The method for adjusting the cutting height includes: Press and push the gear pin to disengage the current gear slot; Pushing the shift handle to slide along the sliding groove and drive the connecting seat to rotate, and the connecting seat drives the connecting rod assembly to move; The front wheel assembly is driven to deflect by the front triangular block, and the rear wheel assembly is driven to deflect by the rear triangular block; so as to adjust the cutting mechanism to a preset mowing height; When the shift handle is released, the shift pin is elastically reset and buckled into the corresponding sliding groove.

[0018] The technical solution provided by the embodiment of the present invention may include the following beneficial effects: the handle assembly rotates around the third axis and is pressed onto the housing, the handle assembly, the front connecting rod and the rear connecting rod form a lever structure, the handle assembly rotates around the third axis on the housing, the front connecting rod drives the front swing arm shaft of the front wheel assembly to swing through the front triangle block, and the rear connecting rod drives the rear swing arm shaft of the rear wheel assembly to swing through the rear triangle block, thereby increasing the height of the housing and then adjusting the height of the cutting mechanism. The handle assembly adopts a lever structure to amplify the lifting force, the user requires less swinging force, the operation is convenient, and the user experience is improved. The gear slot is located on one side of the sliding slot. After the handle assembly is swung into place, the gear pin elastically resets and buckles into the corresponding gear slot to achieve automatic locking, which greatly improves the convenience of operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the invention and, together with the description, serve to explain the principles of the invention.

[0020] Figure 1 FIG1 is a schematic structural diagram of a lawn mower according to an embodiment.

[0021] Figure 2The figure is a schematic structural diagram showing the connection between the height adjustment mechanism and the front wheel assembly and the rear wheel assembly according to one embodiment.

[0022] Figure 3 The figure is a side view schematic diagram showing the connection between the height adjustment mechanism and the front wheel assembly and the rear wheel assembly according to one embodiment.

[0023] Figure 4 is a schematic diagram illustrating a handle assembly according to an embodiment.

[0024] Figure 5 is an exploded schematic diagram showing a handle assembly according to one embodiment.

[0025] Figure 6 The figure shows a schematic diagram of installing a movable roller according to an embodiment.

[0026] In the figure, the housing 10; the front wheel assembly 20; the front wheel 21; the front swing arm shaft 22; the front swing arm portion 221; the front wheel shaft 222; the rear wheel assembly 30; the rear wheel 31; the rear swing arm shaft 32; the height adjustment mechanism 40; the connecting seat 41; the shift seat 42; the gear slot 421; the sliding slot 422; the shift handle 43; the handle sleeve 431; the handle rod 432; the sliding long slot 4321; the unlocking block 433; the inclined surface 4331; the movable rod 434; and the elastic member 435; support frame 436; deformation opening 4361; central hole area 4362; deformation groove 4363; movable roller 437; pin 4371; gear pin 44; third shaft 45; fourth shaft 46; elastic rubber strip 47; straight grain 471; extended grain 472; connecting rod assembly 50; front connecting rod 51; front triangular block 52; snap-fit ​​groove 521; rotating hole 522; rear connecting rod 53; rear triangular block 54; first shaft 55; second shaft 56. DETAILED DESCRIPTION

[0027] The same or similar numbers in the drawings of the embodiments of the present invention correspond to the same or similar parts; in the description of the present invention, it should be understood that if the terms "upper", "lower", "left", "right", "inside", "outside" and the like indicate directions or positional relationships, they are based on the directions or positional relationships shown in the drawings, which are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction. Therefore, the terms describing the positional relationship in the drawings are only used for illustrative purposes and cannot be understood as limiting the present invention. For ordinary technicians in this field, the specific meanings of the above terms can be understood according to specific circumstances.

[0028] like Figures 1 to 3As shown, the present invention provides a lawn mower comprising a housing 10, a cutting mechanism mounted on the housing 10, and a height adjustment mechanism 40. The housing 10 is a thin-walled shell structure, and the cutting mechanism is mounted within the housing 10, with the cutting blade of the cutting mechanism protruding toward the ground. Preferably, the housing 10 is provided with an openable top cover, with the cutting mechanism located below the opening of the top cover to facilitate observation and adjustment of the cutting mechanism.

[0029] The front wheel assembly 20 and the rear wheel assembly 30 are spaced apart and are rotatably connected to the housing 10. The front wheel assembly 20 includes a front swing arm shaft 22 and two front wheels 21 mounted at both ends of the front swing arm shaft 22. The front swing arm shaft 22 includes a U-shaped front swing arm portion 221 and front wheel axles 222 that bend from both ends of the front swing arm portion 221. The two front wheel axles 222 are coaxially arranged, and the front wheels 21 are mounted on the front wheel axles 222. The rear wheel assembly 30 includes a rear swing arm shaft 32 and two rear wheels 31 mounted at both ends of the rear swing arm shaft 32. The rear swing arm shaft 32 includes a U-shaped rear swing arm portion and rear wheel axles that bend from both ends. The two rear wheel axles are coaxially arranged, and the rear wheels 31 are mounted on the rear wheel axles.

[0030] The height adjustment mechanism 40 guides the movement of the mower and adjusts the cutting height of the cutting mechanism. The height adjustment mechanism 40 includes a handle assembly and a connecting rod assembly 50 hingedly connected to the handle assembly. The handle assembly includes a connecting seat 41, a shift seat 42, a shift handle 43, and a shift pin 44 slidably mounted on the shift handle 43. One end of the handle assembly is rotatably connected to the housing 10. Rotation of the handle assembly drives the connecting rod assembly 50 to rotate.

[0031] The connecting rod assembly 50 includes a front connecting rod 51 and a rear connecting rod 53 that are hingedly connected. The front connecting rod 51 is rotatably connected to the front triangle block 52 of the front wheel assembly 20 through a first shaft 55. The first shaft 55 and the front wheel axle 222 of the front wheel assembly 20 are eccentrically arranged. The rear connecting rod 53 is rotatably connected to the rear triangle block 54 of the rear wheel assembly 30 through a second shaft 56. The second shaft 56 and the rear wheel axle of the rear wheel assembly 30 are eccentrically arranged.

[0032] The front link 51 and rear link 53 are respectively hingedly connected to the handle assembly, and can be flexibly adjusted in angle as the handle assembly swings. The front triangular block 52 is fixedly secured to the front swing arm 221, and the rear triangular block 54 is fixedly secured to the rear swing arm. When the front link 51 and rear link 53 are adjusted, they can drive the front swing arm shaft 22 and the rear swing arm shaft 32 to rotate.

[0033] The structures of the front triangular block 52 and the rear triangular block 54 are similar, and the front triangular block 52 is taken as an example for illustrative description.

[0034] The front triangular block 52 is a triangular block structure, and is provided with a snap-in slot 521 and a rotation hole 522. The rotation hole 522 is located at a vertex position, and the snap-in slot 521 is located at the opposite side of the vertex. Preferably, the front triangular block 52 is an isosceles triangle structure.

[0035] The front wheel axle 222 is provided with a front swing arm shaft 22, which is inserted into a snap-in groove 521. The snap-in groove 521 is a concave groove structure, and the U-shaped edge of the front swing arm shaft 22 is inserted into the snap-in groove 521, so that the front swing arm shaft 22 and the front triangular block 52 are connected as a whole. The first shaft 55 is connected to the rotation hole 522 and is connected to the front connecting rod 51. The front connecting rod 51 swings under the drive of the handle assembly, thereby driving the front swing arm shaft 22 to rotate through the front triangular block 52. Using the outside of the front wheel axle 222 as a fulcrum, the overall height of the housing 10 can be raised or lowered, correspondingly adjusting the mowing height of the cutting mechanism.

[0036] Likewise, the rear wheel assembly 30 is driven by the rear connecting rod 53 and the rear triangle block 54 to rise and fall synchronously.

[0037] like Figures 2 to 4 As shown, the shift seat 42 is provided with a sliding slot 422 and multiple shift slots 421. The shift seat 42 is fixedly connected to the housing 10 and protrudes from the surface of the housing 10. The shift seat 42 has an arc-shaped structure, with the notch of the shift slot 421 facing the connecting seat 41. The sliding slot 422 is a long slot structure that extends through the shift seat 42. The shift slots 421 are formed by recessing from the inner curved surface of the shift seat 42. The multiple shift slots 421 are spaced apart, and the spacing angle decreases from the direction of the front wheel assembly 20 to the direction of the rear wheel assembly 30. Furthermore, the shift slots 421 are spaced apart on the inner curved surface of the shift seat 42 about the third axis 45. The shift pin 44 slides into the shift slot 421. The shift seat 42 is provided with an arc-shaped curved structure. After the shift pin 44 disengages the shift slot 421, it can slide smoothly under the drive of the handle assembly, improving the smoothness of sliding.

[0038] The connecting base 41 is hinged to the housing 10 via a third shaft 45, and the shift handle 43 passes through the sliding slot 422 and is fixedly connected to the connecting base 41. In the initial state, the shift pin 44 is engaged with one of the shift slots 421, and the shift handle 43 cannot rotate.

[0039] The front connecting rod 51 and the rear connecting rod 53 are respectively hinged to the connecting base 41 via the fourth axis 46. The fourth axis 46 is located above the third axis 45. Therefore, the fourth axis 46 drives the connecting rod assembly 50 to rotate with the third axis 45 as the fulcrum. When the shift pin 44 releases the lock on the shift slot 421, the shift handle 43 drives the connecting base 41 to rotate about the third axis 45. The shift handle 43 slides along the sliding slot 422, driving the connecting base 41 to rotate. The connecting rod assembly 50 drives the front triangle block 52 and the rear triangle block 54 to rotate, adjusting the cutting plane height of the cutting mechanism. The shift pin 44 engages with the corresponding shift slot 421.

[0040] The handle assembly rotates about a third axis 45 and is pressed against the housing 10. The handle assembly, front link 51, and rear link 53 form a lever structure. The handle assembly rotates about the third axis 45 on the housing 10. The front link 51 drives the front swing arm shaft to swing through the front triangular block 52, and the rear link 53 drives the rear swing arm shaft to swing through the rear triangular block 54, thereby raising the height of the housing 10 and subsequently adjusting the height of the cutting mechanism. The handle assembly uses a lever structure to amplify the lifting force, requiring less swinging force from the user, making operation convenient and improving the user experience.

[0041] The shift slot 421 is located on one side of the sliding slot 422. After the handle assembly is swung into place, the shift pin 44 elastically returns to its original position and buckles into the corresponding shift slot 421, achieving automatic locking and greatly improving operational convenience.

[0042] like Figures 3 to 6 As shown, in one embodiment, the shift handle 43 includes a handle rod 432, a movable rod 434 sliding on the handle rod 432, and an elastic member 435 located in the handle rod 432. The shift pin 44 passes through the handle rod 432, and the elastic member 435 elastically pushes the shift pin 44 to slide against the movable rod 434.

[0043] The handle 432 is provided with a sliding slot 4321 extending therethrough. The shift pin 44 extends through the sliding slot 4321, with both ends of the shift pin 44 extending beyond the handle 432. The shift pin 44 is positioned at the upper position of the sliding slot 4321 under the push of the elastic member 435. The movable rod 434 extends under the action of the shift pin 44. Pressing the movable rod 434 pushes the shift pin 44 to different heights within the sliding slot 4321. In other words, the shift pin 44 can be reset and engaged with the shift slot 421 under the elastic preload of the elastic member 435, achieving height locking and automatic position adjustment.

[0044] Optionally, the movable rod 434 presses the shift pin 44 in a linear pressing manner to lock or unlock the shift slot 421 .

[0045] In one embodiment, the shift handle 43 includes a movable roller 437 mounted on a movable rod 434, a handle sleeve 431 fixed to a handle rod 432, and an unlocking block 433 sliding on the handle sleeve 431, wherein the sliding direction of the unlocking block 433 intersects with the movable direction of the movable rod 434. The unlocking block 433 is provided with an inclined surface 4331, and the inclined surface 4331 slides against the movable roller 437. In this embodiment, the unlocking block 433 can achieve oblique switching unlocking by sliding on the inclined surface 4331 and the movable roller 437. Preferably, the sliding direction of the unlocking block 433 is perpendicular to the movable direction of the movable rod 434, so that the movable rod 434 can be driven to press in the vertical direction by pressing in the horizontal direction.

[0046] The handle sleeve 431 is fixedly connected to the handle rod 432, and the unlocking block 433 is slidably mounted on the handle sleeve 431. The handle sleeve 431 is provided with a slideway and limits the unlocking block 433, thereby improving the convenience of installation and debugging.

[0047] Preferably, the movable roller 437 is fixed to the movable rod 434 through a pin shaft 4371, so that the movable roller 437 can roll, thereby improving the pressing flexibility.

[0048] Furthermore, the shift handle 43 includes a support frame 436 mounted on the movable rod 434. The support frame 436 is provided with a deformable opening 4361. The movable roller 437 is connected to the support frame 436 via a pin 4371. The support frame 436 is configured as a U-shaped opening, and the movable roller 437 is located in a groove of the support frame 436. The movable roller 437 is mounted with a pin 4371, which is inserted through the deformable opening 4361 and assembled with the support frame 436.

[0049] The opening width of the deformation opening 4361 is smaller than the diameter of the pin 4371, so that the pin 4371 can be buckled into the deformation opening 4361, thereby quickly assembling the movable roller 437 and fastening the support frame 436 to the pin 4371. Preferably, the deformation opening 4361 is located at the top of the support frame 436.

[0050] Furthermore, the deformation opening 4361 includes a central hole region 4362, a deformation groove 4363 extending from the central hole region 4362, and an opening region intersecting the central hole region 4362. The diameter of the central hole region 4362 is slightly smaller than the diameter of the pin 4371. The hole wall of the central hole region 4362 elastically fastens to the outer wall of the pin 4371 to achieve elastic snap-fit ​​fixation.

[0051] In one embodiment, the handle assembly further includes an elastic strip 47 attached to the surface of the shift seat 42 . The elastic strip 47 is made of an elastic material, such as a rubber material, a silicone material, or a plastic material.

[0052] The elastic strip 47 adheres to the surface of the shift seat 42 and covers the opening of the sliding slot 422. The shift handle 43 passes through the elastic strip 47 and the sliding slot 422 and is connected to the connecting seat 41. The elastic strip 47 has a through-going dustproof pattern. The dustproof pattern is a pattern that runs through the elastic strip 47 and can reduce the size of the opening to prevent dust and weeds from entering the shift space.

[0053] Specifically, the dustproof pattern includes straight lines 471 parallel to the sliding groove 422 and extended lines 472 distributed on either side of the straight lines 471. The shift knob 43 passes through the dustproof pattern. The straight lines 471 are elongated strips, their dimensions exceeding the length of the sliding groove 422. Multiple extended lines 472 are provided, spaced apart along either side of the straight lines 471, enhancing the fit between the shift knob 43 and the elastic rubber strip 47. Optionally, the extended lines 472 are perpendicular to the straight lines 471; alternatively, they are angled relative to the straight lines 471 to improve grip.

[0054] like Figures 1 to 3 As shown, the front link 51 and the rear link 53 are respectively hingedly connected to the connecting base 41 of the shift handle 43, and the front link 51 and the rear link 53 are in a V-shaped unfolded structure, and the fourth axis 46 is away from the third axis 45 to form a lever structure.

[0055] In one embodiment, when projected horizontally, the front wheel axle 222 is located between the fourth axis 46 and the first axis 55, and the front triangular block 52 projects obliquely away from the shift handle 43. The second axis 56 is located between the rear wheel axle and the fourth axis 46, and the rear triangular block 54 projects obliquely toward the shift handle 43. The front and rear swing arm shafts 22 and 32 are swung at different angles via the front and rear triangular blocks 52 and 54, thereby enabling height adjustment of the housing 10 and increasing the swing amplitude and range.

[0056] The front connecting rod 51 and the rear connecting rod assembly 50 are respectively hinged to the connecting seat 41 to achieve the linkage control and independent adjustment of the front wheel assembly 20 and the rear wheel assembly 30, thereby improving the flexibility of the height modulation of the housing 10.

[0057] In one embodiment, the front link 51 is a straight-wall structure, and the rear link 53 is a curved-arm structure. The length of the front link 51 is smaller than that of the rear link 53. The rear link 53 is bent and connected to the rear triangle block 54. The front link 51 and the rear link 53 are substantially flush when in the lowest gear position.

[0058] In one embodiment, a handle assembly is located on one side of the housing 10. The handle assembly is rotatable and protrudes from the housing 10 for ease of control and operation. Preferably, the rotation centerline of the cutting mechanism intersects the centerline of the shift seat 42, which facilitates control of the cutting height of the cutting mechanism. For example, the cutting mechanism can be adjusted in steps of 10 cm, 20 cm, 30 cm, 40 cm, and 50 cm. Accordingly, the angle of the shift slot 421 gradually decreases from the front wheel assembly 20 toward the rear wheel assembly 30, achieving the same step size, thereby enhancing the leverage effect.

[0059] The mowing height adjustment method of the lawn mower in the above embodiment includes the following adjustment steps: Step S101: Press and push the shift pin 44 to disengage the current shift slot 421. Initially, the shift pin 44 abuts the shift slot 421 under the elastic preload of the elastic member 435, locking the position of the connecting rod assembly 50 and maintaining a consistent mowing height. When the mowing height needs to be adjusted, the unlocking block 433 is pressed, pushing against the movable roller 437. This causes the movable lever 434 to push the shift pin 44, compressing the elastic member 435. Once the shift pin 44 disengages the current shift slot 421, the shift handle 43 can slide along the sliding slot 422.

[0060] In step S102, the shift handle 43 is pushed to slide along the sliding slot 422 and drive the connecting base 41 to rotate, which in turn drives the connecting rod assembly 50. The shift handle 43 drives the hinged front connecting rod 51 and the rear connecting rod 53 to move, thereby realizing a lever-driven structure with low driving force and good driving effect.

[0061] In step S103, the front wheel assembly 20 is rotated via the front triangular block 52, and the rear wheel assembly 30 is rotated via the rear triangular block 54 to adjust the cutting mechanism to a preset mowing height. The front triangular block 52 rotates the front swing arm shaft 22 via the front connecting rod 51, while the rear triangular block 54 rotates the rear swing arm shaft 32 via the rear connecting rod 53. The hinge positions of the front and rear triangular blocks 52, 54 can be adjusted to optimize the swing arm radius and swing range.

[0062] In step S104, the shift handle 43 is released, and the shift pin 44 elastically returns to its original position and snaps into the corresponding sliding slot 422. The mating position of the shift pin 44 and the sliding slot 422 is located on the inner side of the shift seat 42. Furthermore, the shift pin 44 preferably engages the shift slots 421 on either side of the sliding slot 422, achieving dual-position locking and enhancing the locking effect. Furthermore, the shift pin 44 automatically returns to its original position under the elastic force of the elastic member 435, maintaining the locking effect with the shift slot 421 and achieving a good locking effect. The elastic member 435 can be configured as a spring.

[0063] The shift handle 43 is provided with an unlocking block 433 and a gear pin 44 elastically abutting the unlocking block 433. The gear pin 44 disengages from the current gear slot 421 under the pushing action of the unlocking block 433. The shift handle 43 slides along the sliding slot 422 and drives the connecting seat 41 to rotate. The connecting seat 41 drives the connecting rod assembly 50 to move to adjust the working height of the cutting mechanism. The gear pin 44 elastically resets and buckles into the corresponding sliding slot 422.

[0064] It should be understood that the present application is not limited to the precise structure described above and shown in the accompanying drawings, and that various modifications and variations may be made without departing from the scope thereof. This application is intended to cover any variations, uses, or adaptations of the present invention that follow the general principles of this application and include common knowledge or customary techniques in the art that are not disclosed herein.

Claims

1. A lawn mower comprising a housing, a front wheel assembly mounted on the housing, a rear wheel assembly, a cutting mechanism and a height adjustment mechanism, wherein: The height adjustment mechanism comprises: A connecting rod assembly comprising a front connecting rod and a rear connecting rod that are hingedly connected, wherein the front connecting rod is rotatably connected to a front triangular block of the front wheel assembly via a first shaft, the first shaft being eccentrically disposed to the front wheel axle of the front wheel assembly, and the rear connecting rod is rotatably connected to a rear triangular block of the rear wheel assembly via a second shaft, the second shaft being eccentrically disposed to the rear wheel axle of the rear wheel assembly; A handle assembly includes a connecting base, a shift base, a shift handle, and a shift pin slidably mounted on the shift handle, wherein the shift base is fixedly connected to the housing, the shift base is provided with a sliding slot and a plurality of shift slots, the shift handle passes through the sliding slot and is fixedly connected to the connecting base, the connecting base and the housing are hingedly connected via a third axis, the front connecting rod and the rear connecting rod are respectively hingedly connected to the connecting base via a fourth axis, and the fourth axis is located above the third axis; The shift handle slides along the sliding groove and drives the connecting seat to rotate, the connecting rod assembly drives the front triangle block and the rear triangle block to rotate, adjusts the cutting plane height of the cutting mechanism, and the gear pin is clamped to the corresponding gear groove.

2. The lawn mower according to claim 1, wherein: The notch of the gear slot faces the connecting seat and is arranged on the inner arc surface of the gear shift seat with the third axis as the axis, and the gear pin is slidably buckled into the gear slot.

3. The lawn mower according to claim 2, wherein: The shift handle includes a handle rod, a movable rod sliding on the handle rod, and an elastic member located in the handle rod. The shift pin passes through the handle rod, and the elastic member elastically pushes the shift pin to slide and abut against the movable rod.

4. The lawn mower according to claim 3, characterized in that The shift handle includes a movable roller installed on the movable rod, a handle cover fixed to the handle rod and an unlocking block sliding on the handle cover. The sliding direction of the unlocking block intersects with the movable direction of the movable rod. The unlocking block is provided with an inclined surface, and the inclined surface slides against the movable roller.

5. The lawn mower according to claim 4, characterized in that The shift handle includes a support frame installed on the movable rod, the support frame is provided with a deformation opening, and the movable roller is buckled into the deformation opening through a pin and connected to the support frame.

6. The lawn mower according to claim 1, wherein: The handle assembly also includes an elastic rubber strip attached to the surface of the shift seat, the elastic rubber strip is provided with a through dustproof pattern, the dustproof pattern includes a straight pattern parallel to the sliding groove and extended patterns distributed on both sides of the straight pattern, and the shift handle passes through the dustproof pattern.

7. The lawn mower according to claim 1, wherein: In the projection in the horizontal plane direction, the front wheel axle is located between the fourth axis and the first axis, and the second axis is located between the rear wheel axle and the fourth axis.

8. The lawn mower according to claim 1, wherein The front triangle block is provided with a snap-in slot and a rotating hole, the rotating hole is located at the top corner, the snap-in slot is located on the opposite side of the top corner, the front wheel axle is provided with a front swing arm shaft, the front swing arm shaft is embedded in the snap-in slot, and the first shaft is connected to the rotating hole.

9. The lawn mower according to claim 1, wherein The handle assembly is located on one side of the housing, and the rotation center line of the cutting mechanism intersects with the center line of the shift seat.

10. A method for adjusting the cutting height of a lawn mower, characterized in that: The lawn mower according to any one of claims 1 to 9, wherein the method for adjusting the mowing height comprises: Press and push the gear pin to disengage the current gear slot; Pushing the shift handle to slide along the sliding groove and drive the connecting seat to rotate, and the connecting seat drives the connecting rod assembly to move; The front wheel assembly is driven to deflect by the front triangular block, and the rear wheel assembly is driven to deflect by the rear triangular block; so as to adjust the cutting mechanism to a preset mowing height; When the shift handle is released, the shift pin is elastically reset and buckled into the corresponding sliding groove.

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