Lawn mower

Abstract

The application provides a mower, which comprises a housing, an axle mechanism fixedly arranged on the housing, a walking wheel mounted on the axle mechanism, and a driving device accommodated in the housing and capable of driving the walking wheel to walk, wherein the driving device is provided with an output shaft which outputs power to the outside and cooperates with the walking wheel; further comprising a shaft sleeve, the output shaft is locked with the axle mechanism through the shaft sleeve to fix the driving device in the housing. Compared with the prior art, the output shaft of the application is locked with the axle mechanism through the shaft sleeve to fix the reducer in the housing, so that the reducer can be reliably and effectively fixed, and the problem of insufficient space can be solved.

Description

Technical Field

[0001] This invention relates to a lawnmower, and more particularly to a miniaturized lawnmower structure. Background Technology

[0002] A lawnmower is a common gardening tool. Traditional electric lawnmowers use a motor to drive a single blade to cut grass. When mowing a large area, using a small lawnmower is inefficient and time-consuming. Therefore, when mowing large areas, two blades work simultaneously. The lawnmower has two cutting chambers at the bottom of the casing, and the grass is discharged simultaneously from the middle of the rear of the casing.

[0003] Furthermore, since the grass discharge chamber of the double-blade lawnmower is located in the middle of the lawnmower casing, the self-propelled motor and reducer of the lawnmower can only be arranged on one side of the grass discharge chamber. Due to the limitation of the cutting diameter of the lawnmower chassis, the length of the lawnmower's wheels cannot exceed the cutting diameter of the chassis. Therefore, the installation method of the wheels needs to be optimized to meet the installation size requirements.

[0004] Because the weed discharge chamber of the dual-blade lawnmower is located in the middle of the mower's casing, the self-propelled motor and reducer can only be arranged on one side of the discharge chamber. Since the space on one side of the discharge chamber is relatively small, this arrangement causes the pair of rear wheels mounted on the reducer to protrude axially from the mower's casing, making it impossible for the mower to cut weeds in hard corners due to the wheels contacting the wall.

[0005] In view of this, it is indeed necessary to improve the existing lawnmowers to solve the above problems. Summary of the Invention

[0006] The purpose of this invention is to provide a lawnmower that not only reliably and effectively fixes the reducer, but also solves the problem of insufficient space.

[0007] To achieve the above objectives, the present invention provides a lawnmower, including a housing, a wheel and axle mechanism fixedly disposed with the housing, a walking wheel mounted on the wheel and axle mechanism, and a drive device housed within the housing and capable of driving the walking wheel to move. The drive device is provided with an output shaft that outputs power to the outside and cooperates with the walking wheel. The drive device further includes a bushing, and the output shaft and the wheel and axle mechanism are locked together by the bushing to fix the drive device within the housing.

[0008] As a further improvement of the present invention, the wheel and axle mechanism includes a first axle side plate fixedly disposed with the outer shell, a second axle side plate corresponding to the first axle side plate and fixedly disposed with the outer shell, and a connecting rod connecting the first axle side plate and the second axle side plate. One end of the output shaft is sleeved on the first axle side plate, and the other end is sleeved on the second axle side plate.

[0009] As a further improvement of the present invention, it further includes a first height adjustment plate fixedly mounted on the housing and a second height adjustment plate disposed opposite to the first height adjustment plate; the bushing includes a first bushing and a second bushing; one end of the output shaft passes through the first height adjustment plate and the first shaft side plate from the inside to the outside, and the first bushing passes through the first shaft side plate and the first height adjustment plate from the outside to the inside; the other end of the output shaft passes through the second height adjustment plate and the second shaft side plate from the inside to the outside, and the second bushing passes through the second shaft side plate and the second height adjustment plate from the outside to the inside.

[0010] As a further improvement of the present invention, the first height adjustment plate is provided with a first mounting hole through which the output shaft passes and a first flange protruding outward from the periphery of the first mounting hole; the first bushing includes a first base fixedly mounted on the first shaft side plate and a first step portion disposed on the first base and cooperating with the first flange.

[0011] As a further improvement of the present invention, the second height adjustment plate is provided with a second mounting hole through which the output shaft passes and a second flange protruding outward from the periphery of the second mounting hole; the second bushing includes a second base fixedly mounted on the second shaft side plate and a second step portion disposed on the second base and cooperating with the second flange.

[0012] As a further improvement of the present invention, the outer casing is provided with downward-opening grooves on opposite sides, and the output shaft is rotatably accommodated in the grooves.

[0013] As a further improvement of the present invention, the outer casing has downwardly opening recessed areas on opposite sides, and the groove is provided on the upper side of the corresponding recessed area and communicates with the groove so that the output shaft can be received in the corresponding groove through the recessed area.

[0014] As a further improvement of the present invention, a first gear is provided on the output shaft, and a second gear that meshes with the first gear is provided inside the traveling wheel.

[0015] As a further improvement of the present invention, the outer casing includes a lower casing disposed at the bottom and an upper casing mounted on the lower casing. The top of the lower casing is provided with a through hole, and at least a portion of the driving device protrudes from the lower casing through the through hole and is housed within the upper casing.

[0016] As a further improvement of the present invention, it further includes a first blade disposed within the housing and located on a first side, a second blade disposed within the housing and located on a second side opposite to the first side, and a grass discharge chamber disposed in the middle, wherein the driving device is disposed on the first side or the second side.

[0017] The beneficial effects of the present invention are: the output shaft and the wheel axle mechanism of the present invention are locked together by a bushing to fix the reducer in the housing, thereby not only reliably and effectively fixing the reducer, but also solving the problem of insufficient space. Attached Figure Description

[0018] Figure 1 This is a perspective view of the lawnmower of the present invention after the blocking block is installed.

[0019] Figure 2 yes Figure 1 The image shown is a stereoscopic view of the lawnmower from another perspective.

[0020] Figure 3 yes Figure 1 The image shown is a stereoscopic view of the lawnmower from another perspective.

[0021] Figure 4 yes Figure 1 The image shown is a stereoscopic view of the lawnmower from another perspective.

[0022] Figure 5 This is a perspective view of the lawnmower of the present invention after the blockage has been removed.

[0023] Figure 6 yes Figure 5 The image shown is a 3D view from another perspective after the lawnmower has removed the blockage.

[0024] Figure 7 yes Figure 1 The side view of the lawnmower shown reveals the drive relationship between the rear drive wheels and the transmission shaft.

[0025] Figure 8 yes Figure 7 The image shows a cross-sectional view of section AA of the lawnmower.

[0026] Figure 9 yes Figure 1 The image shown is a 3D view of the lawnmower after the wheels have been removed.

[0027] Figure 10 yes Figure 1 The diagram shows a three-dimensional view of the wheel and axle mechanism of a lawnmower.

[0028] Figure 11 yes Figure 1The diagram shows a perspective view of the lawnmower's wheel and axle mechanism, the rear wheels, and the adjustment lever.

[0029] Figure 12 yes Figure 1 A perspective view of the drive mechanism of the lawnmower shown.

[0030] Figure 13 yes Figure 1 An exploded view of the lawnmower's casing is shown.

[0031] Figure 14 yes Figure 13 The image shows a perspective view of the lower casing of the lawnmower.

[0032] Figure 15 yes Figure 13 The image shows a perspective view of the upper casing of a lawnmower.

[0033] Figure 16 yes Figure 1 The diagram shown is a perspective view of the lawnmower after some structures have been removed, revealing the mounting structure of the adjustment lever.

[0034] Figure 17 yes Figure 1 A 3D view of the blockage in the lawnmower shown.

[0035] Figure 18 yes Figure 17 The image shown is a 3D view of the lawnmower blockage from a zero-first-degree perspective.

[0036] Figure 19 yes Figure 8 A magnified view of the circled area on the left.

[0037] Figure 20 yes Figure 8 A magnified view of the circled area on the right. Detailed Implementation

[0038] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be described in detail below with reference to the accompanying drawings and specific embodiments.

[0039] like Figure 1 , Figure 2 , Figure 3 , Figure 11 as well as Figure 12As shown, this invention discloses a lawnmower 100, which includes a housing 10, a wheel and axle mechanism 20 fixedly disposed with the housing 10, a traveling wheel 30 mounted on the wheel and axle mechanism 20, a drive device 40 housed within the housing 10 and capable of driving the traveling wheel 30, a blade 50 housed within the housing 10, an adjustment rod 60 fixedly disposed with the housing 10 and usable for adjusting the cutting height of the blade 50, and a bracket 70 fixedly connected to the adjustment rod 60 to strengthen the structural strength of the adjustment rod 60. The terms "fixedly disposed" and "fixedly connected" refer to a direct connection between the two, or an indirect connection achieved through other structures. "Fixed" refers to a relative fixation between the two, not necessarily a complete immobility. In this embodiment, the adjustment rod 60 is fixed to the housing 10 in a relative position through other structures, and the adjustment rod 60 can rotate within a preset angle to achieve the adjustment function. Detailed structural information can be found in the detailed description in the relevant sections below. It should be noted that, for the sake of convenience in describing the invention, non-relevant components of the lawnmower in the accompanying drawings are hidden and not shown.

[0040] like Figure 1 as well as Figure 3 As shown, in this embodiment, the walking wheels 30 include a pair of rear walking wheels 31 mounted at the rear end and a pair of front walking wheels 32 mounted at the front end. The rear walking wheels 31 are mounted on the wheel and axle mechanism 20. The lawnmower 100 is a double-blade lawnmower, that is, it includes a pair of blades 50, one blade 50 or the first blade is disposed inside the housing 10 and located on a first side, and the other blade 50 or the second blade is located inside the housing 10 on a second side opposite to the first side. Because the lawnmower 100 with double blades 50 is larger and heavier, the drive device 40 can drive the lawnmower to move in order to reduce operating intensity. The drive device 40 includes a drive motor 41 and a reducer 42 connected to the drive motor 41. The reducer 42 is provided with an output shaft 420 for driving the rear walking wheels 31.

[0041] like Figure 1 , Figure 3 as well as Figure 13 As shown, the outer casing 10 includes a lower casing 11 disposed at the bottom and an upper casing 12 mounted on the lower casing 11. Figure 3 As shown, the outer casing 10 has a receiving space 13. The pair of blades 50 are arranged side-by-side within the receiving space 13, and the rotating cutting areas of the pair of blades 50 partially overlap. Figure 1 , Figure 5As shown, the outer casing 10 includes a grass discharge chamber 14, which is disposed between the pair of blades 50 and extends rearward and obliquely upward. The grass discharge chamber 14 extends through the grass outlet 140 of the outer casing 10 at a height higher than the blades 50.

[0042] The lawnmower 100 further includes a main blade drive mechanism (not shown), which drives a pair of blades 50 to rotate in opposite directions. This allows the cut grass clippings to flow backward between the two blades 50 during mowing, passing through the discharge chamber 14 and entering a collection bag (not shown) located at the outlet 140. Since the grass clippings are discharged backward under the influence of gravity, the discharge chamber 14 is angled upwards to counteract this gravity and ensure the discharged grass clippings fall as far as possible into the collection bag. Furthermore, because the cutting volume of a double-blade lawnmower is nearly double that of a single-blade lawnmower, the tilt height and angle of the discharge chamber are greater than those of a single-blade lawnmower.

[0043] like Figure 13 , Figure 14 as well as Figure 15 As shown, since the grass discharge chamber 14 is located in the middle of the outer casing 10 and extends from front to back, the cut grass can be discharged outward from the rear side of the grass discharge chamber 14. In order to achieve the required grass discharge height of the mower 100, the grass discharge chamber 14 has a large tilt angle. However, if the height of the grass discharge chamber 14 is too high, it will be difficult or impossible to successfully stamp the casing 10. Therefore, the casing 10 is divided into a lower casing 11 and an upper casing 12, and the lower casing 11 and the upper casing 12 are made of different materials. In this embodiment, the lower casing 11 is the main body, a metal part made of iron or other suitable metal material by stamping, drawing or other suitable metal stretching processes. The upper casing 12 is on top of the grass discharge chamber 14, and the upper casing 12 is a plastic part made of plastic material. The upper casing 12 is fixed to the lower casing 11 by screws 15. The lower casing 11 and the upper casing 12 together form the grass discharge chamber 14.

[0044] like Figure 13 , Figure 14 as well as Figure 15As shown, the grass-discharging chamber 14 includes a first portion 141 located on the lower housing 11 and a second portion 142 located on the upper housing 12. The top edge of the first portion 141 of the grass-discharging chamber 14 on the lower housing 11 slopes towards the rear of the lawnmower 100. The grass-discharging chamber 14 of the second portion 142 of the upper housing 12 includes an inner layer 1420 and an outer layer 1421. The outer layer 1421 covers the top of the grass-discharging chamber 14 of the first portion 141 of the lower housing 11, and the inner layer 1420 is fitted to the top edge of the grass-discharging chamber 14 of the first portion 141 of the lower housing.

[0045] like Figure 13 as well as Figure 14 As shown, the lower housing 11 has a through hole 110 at its top. At least a portion of the drive device 40 protrudes from the lower housing 11 through the through hole 110 and is housed within the upper housing 12. The lower housing 11 has downwardly opening recessed areas 113 on opposite sides, and further recesses 114 on the upper side of the corresponding recessed areas 113 and opening downward. The recessed areas 113 and the recesses 114 communicate so that the output shaft 420 can be housed within the corresponding recesses 114 through the recessed areas 113, and so that the drive device 40 can be mounted higher, effectively freeing up installation space for the drive device 40. The output shaft 420 is rotatably housed within the recesses 114.

[0046] like Figure 2 , Figure 3 , Figure 5 , Figure 17 as well as Figure 18As shown, the lower housing 11 has a protrusion 111 at a position near the grass outlet 140 within the grass discharge chamber 14. The lower housing 11 also has a positioning hole 112 at a position near the grass outlet 140. The lawnmower 100 further includes a block 80 that can be installed at the grass outlet 140. When the block 80 is installed in the grass outlet 140 of the grass discharge chamber 14, the lawnmower 100 enters the grass-chopping mode. At this time, the block 80 allows the cutting channel of the blade 50 to form a circular structure, allowing the grass blades to rotate fully and be chopped within the cutting chamber of the lawnmower 100. The block 80 includes a pair of arc-shaped surfaces 81. When the block 80 is installed in the grass outlet 140, the pair of arc-shaped surfaces 81 and the outer housing 10 together form a complete figure-eight shaped cutting space, preventing the grass blades from being discharged through the grass discharge chamber 14. After the block 80 is removed, the shredded grass can enter the grass collection bag through the grass discharge chamber 14. The block 80 is provided with a grip portion 82 for easy holding by the user. On the opposite side of the grip portion 82, the block 80 is provided with a locking portion 83 that engages with the protrusion 111 of the lower housing 11 to fix the block 80 to the lower housing 11. In this embodiment, the locking portion 83 includes a pair spaced apart and is elastically movable; correspondingly, the protrusion 111 that engages with the locking portion 83 is also provided with a corresponding pair. The number of locking portions 83 can be specifically designed as needed and is not limited here. Furthermore, the block 80 is provided with a positioning block 84 that engages with the positioning hole 112 on the lower housing 11 to facilitate accurate positioning when installing the block 80. In this embodiment, the positioning blocks 84 are a pair with a certain distance between them; correspondingly, the positioning hole 112 that engages with the positioning block 84 is also provided with a corresponding pair. The number of the positioning blocks 84 and the corresponding positioning holes 112 can be designed according to specific needs, and there is no limitation here.

[0047] like Figure 3 , Figure 4 , Figure 6 , Figures 8 to 11 ,as well as Figure 19As shown, the wheel and axle mechanism 20 includes a first axle side plate 21 pivotally mounted on the output shaft 420, a second axle side plate 22 disposed opposite to the first axle side plate 21 and pivotally mounted on the output shaft 420, and a connecting rod 23 connecting the first axle side plate 21 and the second axle side plate 22. The first axle side plate 21 includes a first wheel axle 210 protruding outward for mounting one of the rear wheels 31, and a first axle hole 211 penetrating the first axle side plate 21. The second axle side plate 22 includes a second wheel axle 220 protruding outward for mounting the other rear wheel 31, and a second axle hole 221 penetrating the first axle side plate 22. The connecting rod 23 is provided with a bend 230 to accommodate the reducer 42 of the drive device 40. Because the lawnmower 100 has a double-blade design 50, and the grass discharge chamber 14 is located in the middle of the outer casing 10 of the lawnmower 100, the drive motor 41 and reducer 42 of the lawnmower 100 can only be arranged inside the outer casing 10 on one side of the grass discharge chamber 14. Due to the limitation of the cutting diameter of the chassis of the lawnmower 100, the length between the left and right directions of the pair of rear wheels 31 and the length between the left and right directions of the pair of front wheels 32 are both less than the maximum length of the outer casing 12 in the left and right directions, thus allowing the lawnmower 100 to cut grass near the wall. Since the distance between the input shaft (not shown) connecting the reducer 42 and the drive motor 41 and the output shaft 420 driving the rear wheels 31 exceeds the height of the lower casing 11, in this embodiment, the drive motor 41 of the drive device 40 extends out of the top of the lower casing 11 through the through hole 110 provided at the top of the lower casing 11, thereby entering the upper casing 12. The output shaft 420 is fixedly disposed with the wheel and axle mechanism 20 and supports and fixes the reducer 42 inside the housing 10.

[0048] Specifically, in this embodiment, the output shaft 420 includes a shorter first shaft 421 disposed on one side of the reducer 42, and a longer second shaft 422 disposed on the opposite side of the reducer 42. The first shaft 421 and the second shaft 422 extend out of the lower housing 11 through grooves 114 provided on opposite sides of the lower housing 11. Figure 7 , Figure 8 , Figure 16 ,and Figure 19As shown, both the first shaft 421 and the second shaft 422 are equipped with a first gear 43, and the rear walking wheel 31 is equipped with a second gear 33 that meshes with the first gear 43, thereby enabling the first shaft 421 and the second shaft 422 to output power to a pair of rear walking wheels 31 respectively. One end of the first shaft 421 of the output shaft 420 passes through the first shaft hole 211 and is sleeved on the first shaft side plate 21, while the opposite end of the second shaft 422 of the output shaft 420 passes through the second shaft hole 221 and is sleeved on the second shaft side plate 22. Please refer to... Figure 19 As shown, the lawnmower 100 further includes a first height adjustment plate 91 fixedly mounted on the housing 10 and a first bushing 92 cooperating with the first shaft 421. The first height adjustment plate 91 is provided with a first mounting hole 911 and a first flange 912 protruding outward from the periphery of the first mounting hole 911. The first flange 912 is located on the side of the first height adjustment plate 91 facing away from the drive device 40. The first bushing 92 includes a first base 921 fixedly mounted on the first shaft side plate 21 and a first step portion 922 disposed on the first base 921 and cooperating with the first flange 912. The first base 921 is located on the side of the first shaft side plate 21 facing away from the drive device 40, and the first step portion 922 is located on the side of the first shaft side plate 21 facing the drive device 40. The first shaft 421, with one end facing away from the drive device 40, passes through the first mounting hole 911 of the first height adjustment plate 91 and the first shaft hole 211 of the first shaft side plate 21 from the inside out. The first bushing 92 passes through the first shaft hole 211 of the first shaft side plate 21 and the first mounting hole 911 of the first height adjustment plate 91 from the outside in, and is sleeved on the first shaft 421. Since the first bushing 92 is installed in the first mounting hole 911 of the first height adjustment plate 91, and the gap between the first bushing 92 and the first mounting hole 911 is very small, the first bushing 92 is radially limited on the first shaft 421. Since the first base 921 is fixedly installed on the first shaft side plate 21, and the first stepped portion 922 abuts against the first flange 912, the first bushing 92 is axially limited on the first shaft 421.

[0049] Please see Figure 20As shown, the lawnmower 100 further includes a second height adjustment plate 93 fixedly mounted on the housing 10 and disposed opposite to the first height adjustment plate 91, and a second bushing 94 cooperating with the second shaft 422. The second height adjustment plate 93 is provided with a second mounting hole 933 and a second flange 932 protruding outward from the periphery of the second mounting hole 933, the second flange 932 being located on the side of the second height adjustment plate 93 away from the drive device 40. The second bushing 94 includes a second base 941 fixedly mounted on the second shaft side plate 22 and a second stepped portion 942 disposed on the second base 941 and cooperating with the second flange 932; the second base 941 is located on the side of the second shaft side plate 22 away from the drive device 40, and the second stepped portion 942 is located on the side of the second shaft side plate 22 facing the drive device 40. The second shaft 422, with one end facing away from the drive device 40, passes from the inside out through the second mounting hole 933 of the second height adjustment plate 93 and the second shaft hole 221 of the second shaft side plate 22. The second bushing 94 passes from the outside in through the second shaft hole 221 of the second shaft side plate 22 and the second mounting hole 933 of the second height adjustment plate 93, and is sleeved on the second shaft 422. Since the second bushing 94 is installed in the second mounting hole 933 of the second height adjustment plate 93, and the gap between the second bushing 94 and the second mounting hole 933 is very small, the second bushing 94 is radially limited on the second shaft 422. Since the second base 941 is fixedly installed on the second shaft side plate 22, and the second stepped portion 942 abuts against the second flange 932, the second bushing 94 is axially limited on the second shaft 422.

[0050] Since the first shaft 421 and the second shaft 422 are installed inside the first bushing 92 and the second bushing 94, and the first bushing 92 and the second bushing 94 are further fixed to the first height adjustment plate 91 and the second height adjustment plate 93, the output shaft 420 is thus fixed using bushings. This fixing structure not only simplifies the installation process, but also occupies less space, avoiding the drawback of existing fixing installation structures occupying a large amount of space.

[0051] like Figure 8 , Figure 11 , Figure 16 as well as Figure 19As shown, the second height adjustment plate 93 is provided with a limiting block 930 that cooperates with the adjustment rod 60. The limiting block 930 has multiple limiting grooves 931 to fix the adjustment rod 60 in different adjustment positions. The adjustment rod 60 is generally L-shaped and includes a fixing part 61 extending in the front-back direction and an operating part 62 extending upward from the fixing part 61 for user operation. The operating part 62 includes a first part 620 extending upward from the fixing part 61, a second part 621 extending from the upper end of the first part 620 away from the outer casing 10, and a third part 622 extending upward from the end of the second part 621 for user operation. In this embodiment, the bracket 70 is welded to the adjustment rod 60. At least one of the fixing part 61 and the operating part 62 of the adjustment rod 60 is welded and fixed to the bracket 70. In this embodiment, the bracket 70 is generally shaped like the number 7, including a first bracket portion 71 that is welded to the fixing portion 61 at one end and extends upward, and a second bracket portion 72 that extends rearward from the other end of the first bracket portion 71. The first bracket portion 71 includes a protruding portion 710 that protrudes towards the operating portion 62, and the protruding portion 710 is welded to the operating portion 62. The wheel axle mechanism 20 is provided with a pair of spaced-apart mounting portions 24, and the fixing portion 61 is mounted on the mounting portions 24 and rotatably mounted on the wheel axle mechanism 20. Specifically, the mounting portions 24 are located on the top of the second shaft side plate 22. The lawnmower 100 further includes a torsion spring 75, which is connected to the second bracket portion 72. The torsion spring 75 is located between the pair of mounting portions 24, and the fixing portion 61 passes through the pair of mounting portions 24 and the torsion spring 75. In this way, the bracket 70 can provide sufficient support for the adjusting rod 60, prevent the adjusting rod 60 from deforming, and simplify the structure and facilitate processing.

[0052] The above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit it. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention.

Claims

1. A lawnmower, comprising a housing, a wheel and axle mechanism fixedly disposed therewith, wheels mounted on the wheel and axle mechanism, and a drive device housed within the housing and capable of driving the wheels, the drive device being provided with an output shaft that outputs power externally and cooperates with the wheels; characterized in that: The lawnmower includes a pair of blades, the housing includes a grass discharge chamber disposed between the pair of blades, and the drive device is disposed on one side of the grass discharge chamber; the lawnmower further includes a bushing, and the output shaft and the wheel axle mechanism are locked together by the bushing to fix the drive device inside the housing; The wheel and axle mechanism includes a first axle side plate fixedly disposed with the outer casing, a second axle side plate corresponding to the first axle side plate and fixedly disposed with the outer casing, and a connecting rod connecting the first axle side plate and the second axle side plate. One end of the output shaft is sleeved on the first axle side plate, and the other end is sleeved on the second axle side plate. The lawnmower also includes a first height adjustment plate fixedly mounted on the outer casing and a second height adjustment plate opposite to the first height adjustment plate. The bushing includes a first bushing and a second bushing. One end of the output shaft passes through the first height adjustment plate and the first axle side plate from the inside to the outside, and the first bushing passes through the first axle side plate and the first height adjustment plate from the outside to the inside. The other end of the output shaft passes through the second height adjustment plate and the second axle side plate from the inside to the outside, and the second bushing passes through the second axle side plate and the second height adjustment plate from the outside to the inside.

2. The lawnmower according to claim 1, characterized in that: The first height adjustment plate is provided with a first mounting hole for the output shaft to pass through and a first flange protruding outward from the periphery of the first mounting hole; the first bushing includes a first base fixedly mounted on the first shaft side plate and a first step portion disposed on the first base and cooperating with the first flange.

3. The lawnmower according to claim 2, characterized in that: The second height adjustment plate is provided with a second mounting hole through which the output shaft passes and a second flange protruding outward from the periphery of the second mounting hole; the second bushing includes a second base fixedly mounted on the second shaft side plate and a second step portion disposed on the second base and cooperating with the second flange.

4. The lawnmower according to claim 1, characterized in that: The outer casing has downward-opening grooves on opposite sides, and the output shaft is rotatably housed within the grooves.

5. The lawnmower according to claim 4, characterized in that: The outer casing has downward-opening recessed areas on opposite sides; the groove is located on the upper side of the recessed area and communicates with the recessed area so that the output shaft can be received in the corresponding groove through the recessed area.

6. The lawnmower according to claim 1, characterized in that: The output shaft is provided with a first gear, and the traveling wheel is provided with a second gear that meshes with the first gear.

7. The lawnmower according to claim 1, characterized in that: The housing includes a lower housing located at the bottom and an upper housing mounted on the lower housing. The top of the lower housing has a through hole, and at least a portion of the driving device protrudes from the lower housing through the through hole and is housed within the upper housing.

8. The lawnmower according to claim 1, characterized in that: It further includes a first blade disposed within the housing and located on a first side, a second blade disposed within the housing and located on a second side opposite to the first side, and the grass discharge chamber disposed in the middle, wherein the drive device is disposed on the first side or the second side.

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