CN110839395A - Grass cutter - Google Patents

Abstract

The invention provides a mower which comprises a shell, an axle mechanism fixedly arranged with the shell, a travelling wheel arranged on the axle mechanism, and a driving device accommodated in the shell and capable of driving the travelling wheel to travel, wherein the driving device is provided with an output shaft for outputting power outwards and matched with the travelling wheel; the output shaft and the wheel shaft mechanism are locked through the shaft sleeve so as to fix the driving device in the shell. Compared with the prior art, the speed reducer is fixed in the shell by locking the output shaft and the wheel shaft mechanism through the shaft sleeve, so that the speed reducer can be reliably and effectively fixed, and the problem of insufficient space can be solved.

Description

Grass cutter

Technical Field

The invention relates to a mower, in particular to a small-sized structure of the mower.

Background

The lawn mower is a common garden tool, and the traditional electric lawn mower drives a blade to realize the function of mowing through a motor. When the mowing area is large, the mowing efficiency of the small-size mower is low, and the time consumption is long when large-area lawns are cut. Therefore, when a field with a large area is cut, two blades work simultaneously, two mowing cavities are arranged below the machine shell of the mower, and grass is discharged from the middle of the rear end of the machine shell simultaneously.

In addition, because the grass discharging cavity of the double-blade mower is arranged in the middle of the shell of the mower, the self-propelled motor and the speed reducer of the mower can be arranged on one side of the grass discharging cavity only and are limited by the cutting diameter of the chassis of the mower, and the length of the walking wheel of the mower cannot exceed the cutting diameter of the chassis, so that the mounting mode of the walking wheel needs to be optimized to meet the requirement of mounting size.

The grass discharge cavity of the double-blade mower is arranged in the middle of the shell of the mower, so that the self-propelled motor and the speed reducer of the mower can be arranged on one side of the grass discharge cavity only. Because the space on one side of the grass discharging cavity is small, the arrangement is such that a pair of rear wheels mounted on the speed reducer protrude out of the housing of the mower in the axial direction of the rear wheels, so that the mower cannot trim weeds in strong corners due to the fact that the wheels contact the wall.

In view of the above, there is a need for an improved lawn mower to solve the above problems.

Disclosure of Invention

The invention aims to provide a mower which not only can reliably and effectively fix a speed reducer, but also can solve the problem of insufficient space.

In order to achieve the purpose, the invention provides a mower which comprises a shell, an axle mechanism fixedly arranged with the shell, a travelling wheel arranged on the axle mechanism, and a driving device accommodated in the shell and capable of driving the travelling wheel to travel, wherein the driving device is provided with an output shaft which outputs power outwards and is matched with the travelling wheel; the output shaft and the wheel shaft mechanism are locked through the shaft sleeve so as to fix the driving device in the shell.

As a further improvement of the present invention, the axle mechanism includes a first axle side plate fixedly disposed on the housing, a second axle side plate disposed corresponding to the first axle side plate and fixedly disposed on the housing, and a connecting rod connecting the first axle side plate and the second axle side plate, wherein one end of the output shaft is sleeved on the first axle side plate, and the other opposite end is sleeved on the second axle side plate.

As a further improvement of the present invention, the present invention further comprises a first height-adjusting plate fixedly mounted on the housing and a second height-adjusting plate disposed opposite to the first height-adjusting plate; the shaft sleeve comprises a first shaft sleeve and a second shaft sleeve; one end of the output shaft penetrates through the first height-adjusting plate and the first shaft side plate from inside to outside, and the first shaft sleeve penetrates through the first shaft side plate and the first height-adjusting plate from outside to inside; the other end of the output shaft penetrates through the second height-adjusting plate and the second shaft side plate from inside to outside, and the second shaft sleeve penetrates through the second shaft side plate and the second height-adjusting plate from outside to inside.

As a further improvement of the present invention, the first height-adjusting plate is provided with a first mounting hole for the output shaft to pass through and a first flange formed by protruding outward from the periphery of the first mounting hole; the first shaft sleeve comprises a first base fixedly mounted on the first shaft side plate and a first step portion arranged on the first base and matched with the first flanging.

As a further improvement of the present invention, the second height-adjusting plate is provided with a second mounting hole for the output shaft to pass through and a second flange formed by protruding outward from the periphery of the second mounting hole; the second shaft sleeve comprises a second base fixedly mounted on the second shaft side plate and a second step portion arranged on the second base and matched with the second flanging.

As a further improvement of the present invention, two opposite sides of the housing are provided with grooves opened downward, and the output shaft is rotatably received in the grooves.

As a further improvement of the present invention, two opposite sides of the housing are provided with recessed regions which are open downward, and the grooves are provided on upper sides of the respective recessed regions and communicate with the grooves so that the output shafts can be accommodated in the respective grooves through the recessed regions.

As a further improvement of the invention, a first gear is arranged on the output shaft, and a second gear meshed with the first gear is arranged in the travelling wheel.

As a further improvement of the present invention, the housing includes a lower housing disposed at the bottom and an upper housing mounted on the lower housing, a through hole is disposed at the top of the lower housing, and at least a portion of the driving device protrudes from the lower housing through the through hole and is accommodated in the upper housing.

As a further improvement of the present invention, further comprising a first blade disposed in the housing and located at a first side, a second blade disposed in the housing and located at a second side opposite to the first side, and a grass discharge chamber disposed in the middle, the driving device being disposed at the first side or the second side.

The invention has the beneficial effects that: the output shaft and the wheel shaft mechanism are locked through the shaft sleeve to fix the speed reducer in the shell, so that the speed reducer can be reliably and effectively fixed, and the problem of insufficient space can be solved.

Drawings

Fig. 1 is a perspective view of the mower of the present invention with the clogs installed.

Fig. 2 is a perspective view of the mower shown in fig. 1 from another perspective.

Fig. 3 is a perspective view of the lawnmower shown in fig. 1 from another perspective.

Fig. 4 is a perspective view of the mower of fig. 1 from another perspective.

Fig. 5 is a perspective view of the mower of the present invention with the jam removed.

Fig. 6 is a perspective view of the lawnmower of fig. 5 from another perspective with the jam removed.

FIG. 7 is a side view of the mower shown in FIG. 1, revealing the drive relationship between the road wheels on the rear side and the transmission shaft.

Fig. 8 is a cross-sectional view of the mower of fig. 7 taken along section a-a.

Fig. 9 is a perspective view of the lawnmower of fig. 1 from another perspective with the road wheels removed.

Fig. 10 is a perspective view of an axle mechanism of the lawnmower shown in fig. 1.

Fig. 11 is a perspective view of the axle mechanism and the road wheels and the adjustment lever on the rear side of the lawnmower shown in fig. 1.

Fig. 12 is a perspective view of the drive device of the lawnmower shown in fig. 1.

Fig. 13 is an exploded view of the housing of the mower shown in fig. 1.

Fig. 14 is a perspective view of a lower housing of the lawnmower shown in fig. 13.

Fig. 15 is a perspective view of an upper housing of the lawnmower shown in fig. 13.

Fig. 16 is a perspective view of the lawnmower shown in fig. 1 with a portion of the structure removed to show the mounting structure of the adjustment lever.

Fig. 17 is a perspective view of a block of the lawnmower shown in fig. 1.

Fig. 18 is a perspective view from zero viewing angle of the jam of the mower shown in fig. 17.

Fig. 19 is a partially enlarged view of a left circled portion in fig. 8.

Fig. 20 is a partially enlarged view of a right-hand circled portion in fig. 8.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be described in detail with reference to the accompanying drawings and specific embodiments.

As shown in fig. 1, 2, 3, 11 and 12, the present invention discloses a lawn mower 100, which comprises a housing 10, an axle mechanism 20 fixed to the housing 10, a road wheel 30 mounted on the axle mechanism 20, a driving device 40 received in the housing 10 and driving the road wheel 30 to walk, a blade 50 received in the housing 10, an adjusting rod 60 fixed to the housing 10 and capable of adjusting a cutting height of the blade 50, and a bracket 70 fixedly connected to the adjusting rod 60 to reinforce a structural strength of the adjusting rod 60. The fixed arrangement and the fixed connection refer to a direct connection between the two or an indirect connection achieved through other structures, the fixed arrangement refers to a relative fixation between the two, and does not limit the two to be completely fixed, in this embodiment, the adjusting rod 60 is fixed by keeping a relative position with the housing 10 through other structures, and the adjusting rod 60 can rotate within a preset angle to achieve an adjusting function, and the detailed structure can refer to the detailed description of the relevant parts later. It should be noted that, in order to describe the content of the present invention more conveniently, the non-relevant parts of the mower in the drawings of the present invention are blanked out in the drawings and are not shown.

As shown in fig. 1 and 3, in the present embodiment, the traveling wheels 30 include a pair of rear traveling wheels 31 mounted at a rear end, and a pair of front traveling wheels 32 mounted at a front end, and the rear traveling wheels 31 are mounted on the wheel axle mechanism 20. The mower 100 is a double-bladed mower, i.e., it includes a pair of blades 50, one blade 50 or first blade being disposed within the housing 10 on a first side and the other blade 50 or second blade being disposed within the housing 10 on a second side opposite the first side. The lawn mower 100 having the double blade 50 is large in size and heavy in weight, and the driving device 40 can drive the lawn mower to walk in order to reduce the operation strength. The driving device 40 includes a driving motor 41 and a speed reducer 42 connected to the driving motor 41, and the speed reducer 42 is provided with an output shaft 420 for driving the rear traveling wheel 31 to travel.

As shown in fig. 1, 3 and 13, the housing 10 includes a lower case 11 provided at the bottom and an upper case 12 mounted on the lower case 11. As shown in fig. 3, the housing 10 is provided with a receiving space 13. The pair of blades 50 are arranged side by side in the housing space 13, and the rotary cutting areas of the pair of blades 50 partially overlap. As shown in fig. 1 and 5, the housing 10 includes a grass discharge chamber 14, and the grass discharge chamber 14 is disposed between the pair of blades 50 and extends rearward and obliquely upward. The grass discharge cavity 14 penetrates through the grass outlet 140 of the housing 10 and is higher than the blades 50.

The mower 100 further comprises a main blade driving mechanism (not shown) for driving the pair of blades 50 to rotate and to make the pair of blades 50 rotate in opposite directions, so as to drive the cut grass blades to flow backwards from between the two blades 50 and enter a grass collecting bag (not shown) arranged at the grass outlet 140 through the grass discharge chamber 14 during mowing. Because the grass blades cut by the mower are simultaneously acted by gravity when being discharged backwards, in order to counteract the action of gravity, the discharged grass clippings fall into the rear of the grass collecting bag as far as possible, and the grass discharging cavity 14 is arranged obliquely upwards. Meanwhile, the cutting amount of the double-blade mower is nearly doubled compared with that of the single-blade mower, so that the inclined height and the angle of the grass discharge cavity are larger than those of the grass discharge cavity of the single-blade mower.

As shown in fig. 13, 14 and 15, the grass discharge chamber 14 is disposed at a middle position of the housing 10 and extends from the front to the rear, so that the cut grass can be discharged from the rear side of the grass discharge chamber 14 to the outside, and the inclination angle of the grass discharge chamber 14 is large in order to meet the required grass discharge height of the lawn mower 100. However, the height of the grass discharge chamber 14 is too high, making the enclosure 10 difficult or impossible to stamp successfully. Therefore, the housing 10 is divided into the lower housing 11 and the upper housing 12, and the material of the lower housing 11 is different from that of the upper housing 12. In this embodiment, the lower housing 11 is a body portion made of a metal piece of ferrous or other suitable metal material by stamping, drawing or other suitable metal extension process, the upper housing 12 is at the top of the grass discharge chamber 14, and the upper housing 12 is a plastic piece of plastic material. The upper case 12 is fixed to the lower case 11 by screws 15. The lower housing 11 and the upper housing 12 together form the grass discharge chamber 14.

As shown in fig. 13, 14 and 15, the grass discharge chamber 14 includes a first portion 141 located in the lower housing 11 and a second portion 142 located in the upper housing 12. The top edge of the first portion 141 of the grass discharge chamber 14 of the lower housing 11 is inclined toward the rear of the mower 100. The grass discharge cavity 14 of the second part 142 of the upper shell 12 comprises an inner layer 1420 and an outer layer 1421, the outer layer 1421 wraps the top of the grass discharge cavity 14 of the first part 141 of the lower shell 11, and the inner layer 1420 is attached to the top edge of the grass discharge cavity 14 of the first part 141 of the lower shell.

As shown in fig. 13 and 14, a through hole 110 is formed in the top of the lower housing 11, and at least a portion of the driving device 40 protrudes from the lower housing 11 through the through hole 110 and is accommodated in the upper housing 12. The lower case 11 is provided at opposite sides with downwardly opened depressed regions 113, and further with downwardly opened grooves 114 provided at upper sides of the respective depressed regions 113, the depressed regions 113 communicating with the grooves 114 so that the output shafts 420 can be received in the respective grooves 114 through the depressed regions 113, and so that the driving means 40 can be mounted more upward, corresponding to freeing up the mounting space of the driving means 40, the output shafts 420 being rotatably received in the grooves 114.

As shown in fig. 2, 3, 5, 17 and 18, the lower housing 11 is provided with a protrusion 111 at a position near the grass outlet 140 in the grass discharge chamber 14. The lower housing 11 is provided with a positioning hole 112 at a position close to the grass outlet 140. The mower 100 further comprises a block 80 mountable at the grass outlet 140. After the block 80 is installed in the grass outlet 140 of the grass discharge chamber 14, the lawn mower 100 enters a grass chopping mode, and at this time, the block 80 can make the cutting chamber channel of the blade 50 form a circular structure, so that grass chopping blades can be sufficiently rotated in the grass chopping chamber of the lawn mower 100 to be chopped. The sprue 80 comprises a pair of arc-shaped surfaces 81, when the sprue 80 is installed behind the grass outlet 140, the pair of arc-shaped surfaces 81 and the shell 10 jointly form a cutting space in a complete 8 shape, and at the moment, grass smashing leaves cannot pass through the grass discharging cavity 14 to be discharged. When the block 80 is removed, the grass pieces can enter the grass collecting bag through the grass discharge chamber 14. The block 80 is provided with a gripping portion 82 for facilitating a user to grip the block 80. The block 80 is provided with a locking portion 83 on the opposite side of the grip portion 82 to be engaged with the projection 111 of the lower case 11 to fix the block 80 to the lower case 11. In the present embodiment, the locking portion 83 includes a pair of locking portions arranged at an interval, and is elastically movable; accordingly, the projection 111 engaged with the locking portion 83 is also provided with a pair provided correspondingly. The number of the locking portions 83 may be specifically designed as needed, and is not limited herein. Further, the block 80 is provided with a positioning block 84 which is matched with the positioning hole 112 on the lower shell 11, so that the block 80 can be accurately positioned when being installed. In this embodiment, the positioning blocks 84 are a pair with a certain distance; accordingly, a pair of the positioning holes 112 matching with the positioning blocks 84 is also provided. The number of the positioning blocks 84 and the corresponding positioning holes 112 can be designed according to the requirement, and is not limited herein.

As shown in fig. 3, 4, 6, 8 to 11, and 19, the wheel axle mechanism 20 includes a first axle side plate 21 pivotally mounted on the output axle 420, a second axle side plate 22 disposed opposite to the first axle side plate 21 and pivotally mounted on the output axle 420, and a link 23 connecting the first axle side plate 21 and the second axle side plate 22. The first axle-side plate 21 includes a first axle 210 formed to protrude outward for mounting one of the rear traveling wheels 31, and a first axle hole 211 penetrating the first axle-side plate 21. The second axle side plate 22 includes a second axle 220 formed to protrude outward for mounting the other rear traveling wheel 31, and a second axle hole 221 penetrating the first axle side plate 22. The connecting rod 23 is provided with a bent portion 230 to give way to the decelerator 42 of the driving device 40. Because the lawn mower 100 is designed with the double blades 50, the grass discharge chamber 14 is arranged at the middle position of the housing 10 of the lawn mower 100, so that the grass discharge chamber 14 can be arranged only at one side of the grass discharge chamber 14 in the housing 10 when the driving motor 41 and the speed reducer 42 of the lawn mower 100 are arranged, and the length between the left and right directions of the pair of rear traveling wheels 31 and the length between the left and right directions of the pair of front traveling wheels 32 of the lawn mower 100 are both smaller than the maximum length of the housing 12 in the left and right directions, so that the lawn mower 100 can cut grass near the wall. Since the distance between an input shaft (not shown) of the decelerator 42 connected to the driving motor 41 and the output shaft 420 driving the rear traveling wheels 31 exceeds the height of the lower case 11, in the present embodiment, the driving motor 41 of the driving device 40 protrudes out of the top of the lower case 11 through the through hole 110 provided at the top of the lower case 11 to enter the upper case 12. The output shaft 420 is fixedly disposed with the wheel axle mechanism 20 and supports and fixes the decelerator 42 in the casing 10.

Specifically, in the present embodiment, the output shaft 420 includes a first shaft 421 having a short size disposed on one side of the decelerator 42 and a second shaft 422 having a long size disposed on the other side opposite to the decelerator 42, and the first shaft 421 and the second shaft 422 respectively protrude out of the lower housing 11 through the grooves 114 provided on the opposite sides of the lower housing 11. As shown in fig. 7, 8, 16, and 19, the first shaft 421 and the second shaft 422 are each provided with a first gear 43, and the rear running wheels 31 are each provided with a second gear 33 that meshes with the first gear 43, so that the first shaft 421 and the second shaft 422 can output power to the pair of rear running wheels 31. 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, and the other 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. Referring to fig. 19, the lawn mower 100 further includes a first height-adjusting plate 91 fixedly mounted on the housing 10 and a first shaft sleeve 92 engaged with the first shaft 421. The first heightening plate 91 is provided with a first mounting hole 911 and a first flange 912 formed by protruding outwards from the periphery of the first mounting hole 911, and the first flange 912 is located on the side of the first heightening plate 91 departing from the driving device 40. The first sleeve 92 comprises a first base 921 fixedly mounted on the first shaft side plate 21 and a first step 922 arranged on the first base 921 and matched with the first flange 912; the first base 921 is located on a side of the first shaft side plate 21 facing away from the driving device 40, and the first stepped portion 922 is located on a side of the first shaft side plate 21 facing the driving device 40. One end of the first shaft 421, which is away from the driving device 40, penetrates through the first mounting hole 911 of the first heightening plate 91 and the first shaft hole 211 of the first shaft side plate 21 from inside to outside; the first shaft sleeve 92 penetrates through the first shaft hole 211 of the first shaft side plate 21 and the first mounting hole 911 of the first height-adjusting plate 91 from outside to inside, and is sleeved on the first shaft 421. Since the first bushing 92 is installed in the first installation hole 911 of the first height-adjusting plate 91, and the gap between the first bushing 92 and the first installation hole 911 is small, the first bushing 92 is limited in the radial direction of the first shaft 421. The first base 921 is fixedly mounted on the first shaft side plate 21, and the first step 922 abuts against the first flange 912, so that the first sleeve 92 is limited in the axial direction of the first shaft 421.

Referring to fig. 20, the mower 100 further includes a second height-adjusting plate 93 fixedly mounted on the housing 10 and disposed opposite to the first height-adjusting plate 91, and a second shaft sleeve 94 engaged with the second shaft 422. The second height-adjusting plate 93 is provided with a second mounting hole 933 and a second flange 932 formed by protruding outwards from the periphery of the second mounting hole 933, and the second flange 932 is located on the side of the second height-adjusting plate 93 away from the driving device 40. The second shaft sleeve 94 includes a second base portion 941 fixedly mounted on the second shaft side plate 22 and a second step portion 942 arranged on the second base portion 941 and engaged with the second flange 932; the second base portion 941 is located on a side of the second shaft side plate 22 facing away from the driving device 40, and the second stepped portion 942 is located on a side of the second shaft side plate 22 facing the driving device 40. One end of the second shaft 422 facing away from the driving device 40 penetrates through the second mounting hole 933 of the second elevation plate 93 and the second shaft hole 221 of the second shaft side plate 22 from inside to outside; the second shaft sleeve 94 passes through the second shaft hole 221 of the second shaft side plate 22 and the second mounting hole 933 of the second height-adjusting plate 93 from outside to inside, and is sleeved on the second shaft 422. Since the second bushing 94 is installed in the second installation hole 933 of the second elevation plate 93, and the gap between the second bushing 94 and the second installation hole 933 is small, the second bushing 94 is limited in the radial direction of the second shaft 422. Since the second base 941 is fixedly mounted on the second shaft side plate 22 and the second step 942 abuts against the second flange 932, the second shaft sleeve 94 is limited in the axial direction of the second shaft 422.

The first shaft 421 and the second shaft 422 are installed in the first shaft sleeve 92 and the second shaft sleeve 94, and the first shaft sleeve 92 and the second shaft sleeve 94 are fixed on the first height-adjusting plate 91 and the second height-adjusting plate 93 in a limiting manner, so that the output shaft 420 is fixed by using shaft sleeves. The fixing structure simplifies the installation procedure, and the occupied space of the fixing structure is small, so that the defect that the existing fixing and installing structure occupies a large space is overcome.

As shown in fig. 8, 11, 16 and 19, the second height-adjusting plate 93 is provided with a limiting block 930 engaged with the adjusting rod 60, and the limiting block 930 is provided with a plurality of limiting grooves 931 to fix the adjusting rod 60 at different adjusting positions. The adjustment lever 60 is substantially L-shaped, and includes a fixing portion 61 extending in the front-rear direction, and an operating portion 62 extending upward from the fixing portion 61 and operable by a user. The operating portion 62 includes a first portion 620 extending upward from the fixing portion 61, a second portion 621 extending from the upper end of the first portion 620 to a side away from the housing 10, and a third portion 622 extending upward from the end of the second portion 621 for operation by a user. In this embodiment, the bracket 70 is welded to the adjustment rod 60. At least one of the fixing portion 61 and the operating portion 62 of the adjusting lever 60 is welded and fixed to the bracket 70. In this embodiment, the bracket 70 is substantially 7-shaped, and includes a first bracket portion 71 having one end welded to the fixing portion 61 and extending upward, and a second bracket portion 72 extending rearward from the other end of the first bracket portion 71, the first bracket portion 71 includes a protrusion portion 710 protruding toward the operating portion 62, and the protrusion portion 710 is welded to the operating portion 62. The axle mechanism 20 is provided with a pair of mounting portions 24 arranged at intervals, and the fixing portion 61 is mounted on the mounting portions 24 and rotatably mounted on the axle mechanism 20. Specifically, the mounting portion 24 is provided on the top of the second shaft-side plate 22. The mower 100 further comprises a torsion spring 75, and the torsion spring 75 is connected to the second bracket portion 72. The torsion spring 75 is disposed 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. Thus, the bracket 70 can provide sufficient support for the adjusting rod 60, prevent the adjusting rod 60 from deforming, simplify the structure and facilitate the processing.

Although the present invention has been described in detail with reference to the preferred embodiments, it will be understood by those skilled in the art that various changes may be made and equivalents may be substituted for elements thereof without departing from the spirit and scope of the present invention.

Claims (10)

1. A mower comprises a shell, an axle mechanism fixedly arranged with the shell, a travelling wheel arranged on the axle mechanism, and a driving device accommodated in the shell and capable of driving the travelling wheel to travel, wherein the driving device is provided with an output shaft which outputs power outwards and is matched with the travelling wheel; the method is characterized in that: the output shaft and the wheel shaft mechanism are locked through the shaft sleeve so as to fix the driving device in the shell.

2. The mower of claim 1, wherein: the wheel shaft mechanism comprises a first shaft side plate fixedly arranged on the shell, a second shaft side plate correspondingly arranged on the first shaft side plate and fixedly arranged on the shell, and a connecting rod connecting the first shaft side plate and the second shaft side plate, wherein one end of the output shaft is sleeved on the first shaft side plate, and the other opposite end of the output shaft is sleeved on the second shaft side plate.

3. The mower of claim 2, wherein: the first height-adjusting plate is fixedly arranged on the shell, and the second height-adjusting plate is arranged opposite to the first height-adjusting plate; the shaft sleeve comprises a first shaft sleeve and a second shaft sleeve; one end of the output shaft penetrates through the first height-adjusting plate and the first shaft side plate from inside to outside, and the first shaft sleeve penetrates through the first shaft side plate and the first height-adjusting plate from outside to inside; the other end of the output shaft penetrates through the second height-adjusting plate and the second shaft side plate from inside to outside, and the second shaft sleeve penetrates through the second shaft side plate and the second height-adjusting plate from outside to inside.

4. A lawnmower as claimed in claim 3, wherein: the first heightening plate is provided with a first mounting hole for the output shaft to pass through and a first flanging which is formed by extending outwards from the periphery of the first mounting hole; the first shaft sleeve comprises a first base fixedly mounted on the first shaft side plate and a first step portion arranged on the first base and matched with the first flanging.

5. The mower of claim 4, wherein: the second height-adjusting plate is provided with a second mounting hole for the output shaft to pass through and a second flanging which is formed by extending outwards from the periphery of the second mounting hole; the second shaft sleeve comprises a second base fixedly mounted on the second shaft side plate and a second step portion arranged on the second base and matched with the second flanging.

6. The mower of claim 2, wherein: the two opposite sides of the shell are provided with grooves with downward openings, and the output shaft is rotatably accommodated in the grooves.

7. The mower of claim 6, wherein: the two opposite sides of the shell are provided with sunken areas with downward openings; the grooves are located on the upper side of the recessed area and communicated with the recessed area so that the output shaft can be accommodated in the corresponding grooves through the recessed area.

8. The mower of claim 1, wherein: the output shaft is provided with a first gear, and the traveling wheel is internally provided with a second gear meshed with the first gear.

9. The mower of claim 1, wherein: the shell is including locating the lower casing of bottom and installing last casing on the casing down, the top of casing is equipped with the through-hole down, at least some passes through of drive arrangement the through-hole protrusion the casing down and accept in the upper casing.

10. The mower of claim 1, wherein: the grass-discharging device comprises a housing, a first blade, a second blade and a grass-discharging cavity, wherein the first blade is arranged in the housing and positioned on a first side, the second blade is arranged in the housing and positioned on a second side opposite to the first side, the grass-discharging cavity is arranged in the middle, and the driving device is arranged on the first side or the second side.

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