A lawnmower

Abstract

The utility model discloses a mower, include: mower main part, walking drive mechanism includes walking motor, and walking motor is installed in mower main part, rotating shaft includes front roller axle and rear roller axle, and front roller axle is installed in the front end of mower main part, and rear roller axle is installed in the rear end of mower main part, and walking drive mechanism is connected in rear roller axle, is used for driving rear roller axle rotation, rolling group includes front roller and rear roller, and front roller is installed in front roller axle, and rear roller is installed in rear roller axle, the ratio of the diameter of front roller with the diameter of rear roller is between 0.6~1, and the torque of walking motor is 2 newtons per meter~10 newtons per meter. Through the proportion of optimization front roller and rear roller, and make the proportion and the torque of walking drive mechanism mutual adaptation, to reduce the resistance that mower main part is received in walking process, improve the endurance of mower.

Description

Technical Field

[0001] This utility model relates to the field of agriculture and forestry, and further to a lawn mower. Background Technology

[0002] A lawnmower, also known as a lawn mower, lawn trimmer, or lawn trimmer, is a mechanical tool used to trim lawns, vegetation, etc., which can greatly improve the efficiency of lawn trimming.

[0003] In existing lawnmowers, to meet the demands for lightweight and environmentally friendly use, electric motors are typically used to drive the mower and complete the mowing operation. With electric motors, the battery life is usually limited, requiring timely charging or battery replacement after a period of use.

[0004] Currently, the common practice to improve battery life is to use large-capacity batteries. However, large-capacity batteries are usually heavier, which increases the overall weight of the lawnmower, increases its load, and reduces its battery life. On the other hand, the increased overall weight of the lawnmower makes it more difficult to move in softer areas, placing higher demands on its usage scenarios. Utility Model Content

[0005] To address the aforementioned technical problems, the purpose of this utility model is to provide a lawnmower in which the diameter of the front roller is smaller than that of the rear roller, and the ratio of the diameter of the front roller to the diameter of the rear roller is between 0.6 and 1. The torque of the walking drive mechanism is between 2 Nm and 10 Nm. By optimizing the ratio and surface profile of the front and rear rollers and making this ratio compatible with the torque of the walking drive mechanism, the resistance encountered by the lawnmower body during walking is reduced, thereby improving the lawnmower's endurance.

[0006] To achieve the above objectives, the present invention aims to provide a lawnmower, comprising:

[0007] Lawn mower body;

[0008] A walking drive mechanism, the walking drive mechanism including a walking motor, the walking motor being mounted on the lawnmower body;

[0009] A rotating shaft, comprising a front roller and a rear roller, wherein the front roller is mounted at the front end of the lawnmower body and the rear roller is mounted at the rear end of the lawnmower body, and the walking drive mechanism is connected to the rear roller for driving the rear roller to rotate;

[0010] A rolling assembly includes a front roller and a rear roller, the front roller being mounted on a front axle and the rear roller being mounted on a rear axle; both the front and rear rollers include a tire body, the tire body having a tread with deep tread areas and shallow tread areas, which are alternately arranged along the circumferential direction of the tire body; the deep tread areas have a first tread, the surface of which is provided with a plurality of first protrusions; the shallow tread areas have a second tread, the surface of which is provided with a plurality of second protrusions; the distance between the first tread and the center of the tire body is less than the distance between the second tread and the center of the tire body, and the surfaces of the first protrusions away from the first tread and the surfaces of the second protrusions away from the second tread are located on the same circular surface;

[0011] The ratio of the diameter of the front roller to the diameter of the rear roller is between 0.6 and 1, and the torque of the walking motor is between 2 Nm and 10 Nm.

[0012] In some embodiments, the diameter of the front roller is between 150mm and 200mm, and the diameter of the rear roller is between 200mm and 250mm.

[0013] In some embodiments, the front roller includes a support shaft, a first lifting shaft, a second lifting shaft, a first lifting arm, and a second lifting arm. One end of the first lifting arm and one end of the second lifting arm are respectively fixed to the two ends of the support shaft, and the first lifting arm and the second lifting arm are both staggered with the support shaft.

[0014] The first lifting shaft is rotatably mounted on the other end of the first lifting arm, and the second lifting shaft is rotatably mounted on the other end of the second lifting arm. The two front rollers are respectively mounted on the first lifting shaft and the second lifting shaft. The first lifting shaft and the second lifting shaft are coaxially arranged, and the central axis of the first lifting shaft and the second lifting shaft is parallel to the central axis of the support shaft.

[0015] In some embodiments, the front end of the lawnmower body has a rotation channel arranged along the width direction of the lawnmower at a preset position, and the two sides of the lawnmower body have a first lifting channel and a second lifting channel respectively corresponding to the position of the rotation channel, and the first lifting channel and the second lifting channel are both connected to the rotation channel;

[0016] The support shaft is rotatably mounted on the rotation channel, the first lifting arm is mounted on the first lifting channel, and the second lifting arm is mounted on the second lifting channel;

[0017] The end of the first lifting shaft away from the first lifting arm extends to the outside of the first lifting channel, and the end of the second lifting shaft away from the second lifting arm extends to the outside of the second lifting channel.

[0018] In some embodiments, the lawnmower further includes a push mechanism mounted on the lawnmower body. The push mechanism includes a drive member, a front push arm, and a front connecting arm. One end of the front push arm is fixed to the support shaft, and the front push arm is staggered with the support shaft. The other end of the front push arm is rotatably connected to one end of the front connecting arm, and the other end of the front connecting arm is connected to the drive member.

[0019] When the drive unit moves the front connecting arm, it can drive the support shaft to rotate in the rotation channel through the front push arm, thereby driving the first lifting arm to rotate in the first lifting channel and the second lifting arm to rotate in the second lifting channel, so as to adjust the position of the first lifting shaft in the first lifting channel and the position of the second lifting shaft in the second lifting channel.

[0020] In some embodiments, the thickness of the first protrusion ranges from 4 mm to 8 mm, and the thickness of the second protrusion ranges from 2 mm to 5 mm.

[0021] In some embodiments, an annular groove is provided around the first tread in the deep tread area, and a connecting protrusion is provided at the middle position of the tread of the tire body, which is circumferentially arranged around the tire body. The connecting protrusion is connected to a plurality of first protrusions and a plurality of second protrusions.

[0022] In some embodiments, along the axial direction of the tire body, both the first protrusion and the second protrusion have a structure that is wide in the middle and narrow at both ends;

[0023] Both the first protrusion and the second protrusion have an extension groove on the surface of the side away from the center of the tire body, and the extension groove extends along the axial direction of the tire body.

[0024] In some embodiments, along the circumferential direction of the tire body, the length of the deep tread region is greater than the length of the shallow tread region, and the number of the first protrusions in the deep tread region is greater than the number of the second protrusions in the shallow tread region, and the distance between adjacent first protrusions is less than the distance between adjacent second protrusions.

[0025] In some embodiments, the surface of the tire body on the side away from the lawnmower body has a side groove corresponding to the shallow tread area and a side protrusion corresponding to the deep tread area. Attached Figure Description

[0026] The preferred embodiments will be described below in a clear and easy-to-understand manner, in conjunction with the accompanying drawings, to further explain the above-mentioned characteristics, technical features, advantages and implementation methods of this utility model.

[0027] Figure 1 This is a schematic diagram of the structure of a lawnmower according to a preferred embodiment of the present invention from one perspective;

[0028] Figure 2 This is a schematic diagram of the lawnmower from another perspective, representing a preferred embodiment of the present invention.

[0029] Figure 3 This is a schematic diagram of the push mechanism of a lawnmower according to a preferred embodiment of the present invention;

[0030] Figure 4 This is a schematic diagram of the cutting cover of a lawnmower according to a preferred embodiment of the present invention;

[0031] Figure 5 This is a schematic diagram of the installation structure of the front roller of a lawnmower according to a preferred embodiment of the present invention.

[0032] Figure 6 This is a schematic diagram of the structure of the rollers of a lawnmower according to a preferred embodiment of the present invention;

[0033] Figure 7 This is a three-dimensional structural schematic diagram of the impeller of a lawnmower according to a preferred embodiment of the present invention.

[0034] Figure 8 This is a three-dimensional structural schematic diagram of the impeller of a lawnmower, which is a preferred embodiment of the present invention, from another perspective.

[0035] Figure 9 This is a schematic diagram of the installation structure of the impeller and blade of a lawnmower according to a preferred embodiment of the present invention;

[0036] Figure 10 This is a schematic diagram of the structure of the lawnmower impeller, blades and drive shaft of the preferred embodiment of the present invention when they are assembled together;

[0037] Figure 11 This is a three-dimensional structural schematic diagram of one embodiment of the blade of a lawnmower, which is a preferred embodiment of the present invention.

[0038] Figure 12 This is a three-dimensional structural schematic diagram of another embodiment of the blade of the lawnmower, which is a preferred embodiment of the present utility model. Detailed Implementation

[0039] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the specific implementation methods of this utility model will be described below with reference to the accompanying drawings. Obviously, the drawings described below are merely some embodiments of this utility model. For those skilled in the art, other drawings and other implementation methods can be obtained based on these drawings without any creative effort.

[0040] To keep the drawings concise, each figure only schematically shows the parts relevant to the utility model, and these do not represent the actual structure of the product. Furthermore, for ease of understanding, in some figures, only one of the components with the same structure or function is schematically depicted, or only one is labeled. In this document, "one" not only means "only one," but can also mean "more than one."

[0041] It should also be further understood that the term “and / or” as used in this application specification and the appended claims means any combination of one or more of the associated listed items and all possible combinations, and includes such combinations.

[0042] In this document, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to mechanical connections or electrical connections; they can refer to direct connections or indirect connections through an intermediate medium; and they can refer to the internal connection between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0043] Furthermore, in the description of this application, the terms "first," "second," etc., are used only to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0044] refer to Figures 1 to 12This application provides a lawnmower 100, including a lawnmower body 10, a walking drive mechanism 20, a rotating shaft 30, and a rolling assembly 40. The walking drive mechanism 20 includes a walking motor mounted on the lawnmower body 10. The rotating shaft 30 includes a front roller 31 and a rear roller 32. The front roller 31 is mounted at the front end of the lawnmower body 10, and the rear roller 32 is mounted at the rear end of the lawnmower body 10. The walking drive mechanism 20 is connected to the rear roller 32 and drives the rear roller 32 to rotate. The rolling assembly 40 includes a front roller 41 and a rear roller 42. The front roller 41 is mounted on the front roller 31, and the rear roller 42 is mounted on the rear roller 32. The ratio of the diameter of the front roller 41 to the diameter of the rear roller 42 is between 0.6 and 1. The torque of the walking motor is between 2 Nm and 10 Nm.

[0045] The rear roller 32 is driven by the walking drive mechanism 20, which can directly drive the rear roller 42 to rotate. Preferably, there are two front rollers 41 and two rear rollers 42, with the two front rollers 41 mounted at both ends of the front roller 31 and the two rear rollers 42 mounted at both ends of the rear roller 32.

[0046] In this application, the diameter of the front roller 41 is smaller than the diameter of the rear roller 42, and the ratio of the diameter of the front roller 41 to the diameter of the rear roller 42 is between 0.6 and 1. The torque of the walking drive mechanism 20 is between 2 Nm and 10 Nm. By optimizing the ratio of the front roller 41 and the rear roller 42 and making this ratio compatible with the torque of the walking drive mechanism 20, the resistance encountered by the lawnmower 100 during walking is reduced, and the endurance of the lawnmower 100 is improved.

[0047] For example, when the lawnmower 100 uses a battery with a capacity of 4 amps / hour (Ah) and is unloaded, using the ratio of the front roller 41 to the rear roller 42 and the torque of the drive mechanism 20 provided in this application, the lawnmower 100 can achieve a runtime of approximately 1 hour; while without using the ratio of the front roller 41 to the rear roller 42 and the torque of the drive mechanism 20 provided in this application, the lawnmower 100 typically has a runtime of approximately 40 minutes. In other words, under the same battery capacity and the same load, the lawnmower 100 provided in this application can significantly improve its runtime.

[0048] Preferably, the diameter of the front roller 41 is between 150mm and 200mm, and the diameter of the rear roller is between 200mm and 250mm. Preferably, the walking drive mechanism 20 is a self-propelled motor.

[0049] refer to Figure 3 , Figure 4 as well as Figure 5 The front roller 31 is a concealed design, meaning that the front roller 31 is hidden within the lawnmower body 10, thereby providing effective protection for the front roller 31 from contact with external debris during the operation of the lawnmower 100.

[0050] Specifically, the front roller 31 includes a support shaft 311, a first lifting shaft 312, a second lifting shaft 313, a first lifting arm 314, and a second lifting arm 315. One end of the first lifting arm 314 and one end of the second lifting arm 315 are respectively fixed to the two ends of the support shaft 311, and the first lifting arm 314 and the second lifting arm 315 are both staggered with the support shaft 311. The first lifting shaft 312 is rotatably mounted on the other end of the first lifting arm 314, and the second lifting shaft 313 is rotatably mounted on the other end of the second lifting arm 315. Two front rollers 41 are respectively mounted on the first lifting shaft 312 and the second lifting shaft 313, and the first lifting shaft 312 and the second lifting shaft 313 are coaxially arranged, and the central axis of the first lifting shaft 312 and the second lifting shaft 313 is parallel to the central axis of the support shaft 311.

[0051] The lawnmower body 10 has a rotating channel 11 at a predetermined position at its front end, which is arranged along the width direction of the lawnmower. The lawnmower body 10 has a first lifting channel 12 and a second lifting channel 13 on both sides corresponding to the rotating channel 11, respectively. Both the first lifting channel 12 and the second lifting channel 13 are connected to the rotating channel 11. A support shaft 311 is rotatably mounted on the rotating channel 11. A first lifting arm 314 is mounted on the first lifting channel 12, and a second lifting arm 315 is mounted on the second lifting channel 13. The end of the first lifting shaft 312 away from the first lifting arm 314 extends to the outside of the first lifting channel 12, and the end of the second lifting shaft 313 away from the second lifting arm 315 extends to the outside of the second lifting channel 13.

[0052] In this application, the lawnmower body 10 surrounds the rotating channel 11, the first lifting channel 12, and the second lifting channel 13. The support shaft 311 of the front roller 31 is rotatably mounted on the rotating channel 11. The first lifting arm 314 and the second lifting arm 315 are respectively mounted on the first lifting channel 12 and the second lifting channel 13, which can effectively shield the front roller 31 to achieve a hidden design of the front roller 31.

[0053] refer to Figure 3 The lawnmower 100 further includes a push mechanism 50 installed on the lawnmower body 10. The push mechanism 50 can drive the support shaft 311 to rotate in the rotation channel 11, so as to drive the first lifting arm 314 to rotate relative to the first lifting shaft 312 and the second lifting arm 315 to rotate relative to the second lifting shaft 313, so as to adjust the height of the front end of the lawnmower body 10 relative to the working surface.

[0054] In the lowered state, the first lifting shaft 312 and the second lifting shaft 313 move to the top of the first lifting channel 12 and the second lifting channel 13, respectively, or move above the support shaft 311. At this time, there is a small distance between the front end of the lawnmower body 10 and the working surface. In the raised state, the first lifting shaft 312 and the second lifting shaft 313 move to the bottom of the first lifting channel 12 and the second lifting channel 13, respectively, or move below the support shaft 311. At this time, there is a larger distance between the front end of the lawnmower body 10 and the working surface.

[0055] refer to Figure 3 Specifically, the pushing mechanism 50 includes a driving member 51, a front pushing arm 52, and a front connecting arm 53. One end of the front pushing arm 52 is fixed to the support shaft 311, and the front pushing arm 52 and the support shaft 311 are staggered. The other end of the front pushing arm 52 is rotatably connected to one end of the front connecting arm 53, and the other end of the front connecting arm 53 is connected to the driving member 51. When the driving member 51 drives the front connecting arm 53 to move, it can drive the support shaft 311 to rotate within the rotation channel 11 through the front pushing arm 52. This allows the first lifting arm 314 to rotate within the first lifting channel 12 and the second lifting arm 315 to rotate within the second lifting channel 13, thereby adjusting the position of the first lifting shaft 312 within the first lifting channel 12 and the position of the second lifting shaft 313 within the second lifting channel 13, and controlling the first lifting shaft 312 and the second lifting shaft 313 to switch between the lowering state and the raising state.

[0056] Preferably, the drive member 51 can drive the front connecting arm 53 to move along the length direction of the lawnmower body 10. During the movement of the front connecting arm 53, it can drive the end of the front push arm 52 away from the support shaft 311 to move along the length direction of the lawnmower body 10, thereby driving the support shaft 311 to rotate in the rotation channel 11.

[0057] refer to Figure 3 Specifically, the driving component 51 includes a driving body 511, a first folding arm 512, a second folding arm 513, and a sliding block 514. One end of the first folding arm 512 is rotatably connected to the sliding block 514, and the other end of the first folding arm 512 is connected to one end of the second folding arm 513. The other end of the second folding arm 513 is slidably mounted on the sliding block 514. The driving body 511 is mounted on one side of the sliding block 514. The sliding block 514 has a sliding groove 5141 and sliding openings 5142 on both sides communicating with the sliding groove 5141. The movable shaft of the driving body 511 extends into the sliding groove 5141 and is pivotally connected to the other end of the second folding arm 513. When the driving component 51 drives the movable shaft to move within the sliding groove 5141, it can cause the other end of the second folding arm 513 to slide relative to the sliding block 514. One end of the front connecting arm 53, away from the front pushing arm 52, is rotatably connected to the second folding arm 513. When the driving body 511 drives the other end of the second folding arm 513 to slide relative to the sliding block 514, it can drive the front connecting arm 53 to move along the length direction of the lawnmower body 10.

[0058] refer to Figure 3 Furthermore, the pushing mechanism 50 further includes a rear pushing arm 54 and a rear connecting arm 55. One end of the rear connecting arm 55 is connected to the second folding arm 513, and the other end is connected to the rear pushing arm 54. The other end of the rear pushing arm 54 is connected to the rear roller 32. The rear roller 42 is rotatably mounted on the rear pushing arm 54 and is offset from the rear roller 32. When the other end of the second folding arm 513 slides relative to the sliding block 514, it can drive the front connecting arm 53 and the rear connecting arm 55 to move synchronously, thereby controlling the synchronous lifting and lowering of the front and rear ends of the lawnmower body 10.

[0059] refer to Figure 6Furthermore, both the front roller 41 and the rear roller 42 include a tire body 431. The tread 432 of the tire body 431 is provided with a deep tread region 433 and a shallow tread region 434, which are staggered along the circumferential direction of the tire body 431. The deep tread region 433 has a first tread 435, and the surface of the first tread 435 is provided with a plurality of first protrusions 436. The shallow tread region 434 has a second tread 437, and the surface of the second tread 437 is provided with a plurality of second protrusions 438. The distance between the center of the first tread 435 and the center of the tire body 431 is less than the distance between the center of the second tread 437 and the center of the tire body 431. The surfaces of the first protrusions 436 away from the first tread 435 and the surfaces of the second protrusions 438 away from the second tread 437 are located on the same circular surface.

[0060] In this application, by alternately arranging the deep tread region 433 and the shallow tread region 434 in the circumferential direction of the tire body 431, the friction and resistance when the tire contacts the ground can be balanced, thereby improving driving efficiency. On the other hand, the alternate arrangement of the deep tread region 433 and the shallow tread region 434 can also break gas resonance during operation and reduce noise during driving.

[0061] Preferably, the thickness of the first protrusion 436 is in the range of 4mm to 8mm, and the thickness of the second protrusion 438 is in the range of 2mm to 5mm.

[0062] refer to Figure 6 Furthermore, in the deep tread region 433, an annular groove 4351 is provided around the first tread 435. A connecting protrusion 439, circumferentially arranged around the tire body 431, is provided at the center of the tread 432 of the tire body 431. The connecting protrusion 439 connects to several first protrusions 436 and several second protrusions 438. By providing the annular groove 4351 around the first tread 435 in the deep tread region 433, the discharge of liquid or gas between adjacent first protrusions 436 can be accelerated when the tread 432 contacts the ground. On the other hand, by providing the annular groove 4351, the depth of the deep tread region 433 can also be increased to a certain extent, further improving the tire's grip performance.

[0063] Specifically, along the axial direction of the tire body 431, both the first protrusion 436 and the second protrusion 438 have a structure that is wider in the middle and narrower at both ends. During the tire's contact with the ground, the middle region of the first protrusion 436 and the second protrusion 438 bears greater pressure, while the pressure at both ends is less. The width in the middle of the first protrusion 436 and the second protrusion 438 increases the load-bearing capacity. On the other hand, the narrow ends of the first protrusion 436 and the second protrusion 438, and the larger distance between the ends of adjacent first protrusion 436 or adjacent ends of second protrusion 438, facilitate the discharge of liquids or gases.

[0064] refer to Figure 6 Both the first protrusion 436 and the second protrusion 438 have an extension groove 4311 on the surface away from the center of the tire body 431. The extension groove 4311 extends along the axial direction of the tire body 431. By providing the extension groove 4311, the surface roughness of the first protrusion 436 and the second protrusion 438 can be increased, thereby increasing the friction with the ground.

[0065] Furthermore, along the circumferential direction of the tire body 431, the length of the deep tread region 433 is greater than the length of the shallow tread region 434, and the number of the first protrusions 436 in the deep tread region 433 is greater than the number of the second protrusions 438 in the shallow tread region 434, and the distance between adjacent first protrusions 436 is less than the distance between adjacent second protrusions 438.

[0066] refer to Figure 6 The surface of the tire body 431 away from the lawnmower body 10 has a side groove 4312 corresponding to the shallow tread area 434 and a side protrusion 4313 corresponding to the deep tread area 433. By providing the side groove 4312 and the side protrusion 4313, the weight of the tire body 431 in the circumferential direction can be balanced, resulting in a more uniform weight distribution in the circumferential direction. On the other hand, by providing the side protrusion 4313 in the area corresponding to the deep tread area 433, the structural strength of the deep tread area 433 can be strengthened.

[0067] refer to Figure 4Furthermore, the lawnmower body 10 has a cutting space 14 at its bottom. The lawnmower 100 further includes a working drive mechanism 60 and a cutting mechanism 70. The working drive mechanism 60 is mounted on the lawnmower body 10, and its drive shaft 61 extends into the cutting space 14. The cutting mechanism 70 includes a blade 71 and an impeller 72, both mounted on the drive shaft 61, which drives the blade 71 and impeller 72 to rotate synchronously. The output power of the working drive mechanism 60 is greater than 1000 watts, and the length of the drive shaft 61 extending into the cutting space 14 is greater than 30 mm and less than 50 mm.

[0068] In this application, by controlling the length of the drive shaft 61 extending into the cutting space 14 to match the output power of the working drive mechanism 60, it is possible to ensure the structural strength of the drive shaft 61 while ensuring that the blade 71 and the impeller 72 have sufficient installation space.

[0069] refer to Figure 7 and Figure 8 Specifically, the impeller 72 includes a bushing 721 and a mounting plate 722 extending radially outward from the bushing 721. One end of the bushing 721 has a mounting groove 7201, and the other end has a first locking groove 7202, with the mounting groove 7201 communicating with the first locking groove 7202. The end of the bushing 721 with the first locking groove 7202 extends away from the mounting plate 722 to form a first mounting protrusion 7203, which surrounds the first locking groove 7202. The blade 71 has a mounting hole 710 at a predetermined position, through which the first mounting protrusion 7203 passes. The drive shaft 61 extends into the cutting space 14 with a second locking groove 610. When the drive shaft 61 is installed in the mounting groove 7201, the first locking groove 7202 communicates with the second locking groove 610. The cutting mechanism 70 further includes a fixing rod 73, which is inserted into the first locking groove 7202 and the second locking groove 610, fixing the impeller 72 to the drive shaft 61 while fixing the blade 71 to the impeller 72.

[0070] The fixing rod 73 has a radially outwardly extending abutment plate 731 at its end away from the drive shaft 61. The cutting mechanism 70 further includes an abutment sleeve 74, which is sleeved on the outside of the fixing rod 73 and located between the blade 71 and the abutment plate 731. The abutment sleeve 74 abuts against the blade to limit the movement of the blade 71 away from the drive shaft 61. The abutment plate 731 abuts against the abutment sleeve 74 to limit the movement of the abutment sleeve 74 away from the drive shaft 61. Preferably, the fixing rod 73 is a screw, and the first locking groove 7202 and the second locking groove 610 are provided with threads. The fixing rod 73 is connected to the drive shaft 61 by a threaded connection.

[0071] refer to Figure 11 and Figure 12 Furthermore, the blade 71 has a limiting hole 711 at a preset position, and the mounting plate 722 has a limiting post 723 on the side facing the blade 71. When the first mounting protrusion 7203 is installed in the mounting hole 710, the limiting post 723 is installed in the limiting hole 711. The cooperation between the limiting post 723 and the limiting hole 711 prevents the blade 71 from rotating relative to the mounting plate 722 and reduces the force exerted by the blade 71 on the drive shaft 61 during operation. Preferably, there are two limiting posts 723, located on opposite sides of the drive shaft 61, and the two limiting posts 723 and the drive shaft 61 are on the same straight line. Correspondingly, there are also two limiting holes 711 on the blade 71, and the positions of the limiting holes 711 on the blade 71 correspond to the positions of the two limiting posts 723.

[0072] One end of the bushing 721 with the mounting groove 7201 extends away from the mounting plate 722 to form a second mounting protrusion 7204. The second mounting protrusion 7204 surrounds the mounting groove 7201 and is fitted onto the outside of the drive shaft 61. The distance between the end of the second mounting protrusion 7204 away from the mounting plate 722 and the end of the drive shaft 61 is between 5mm and 15mm. In other words, the depth of the mounting groove 7201 is between 5mm and 15mm. By controlling the distance between the end of the second mounting protrusion 7204 away from the mounting plate 722 and the drive shaft 61 within a certain range, the impeller 72 and the drive shaft 61 can have sufficient contact area, effectively ensuring the stability of the impeller 72 mounted on the drive shaft 61.

[0073] Furthermore, the lawnmower 100 includes a plurality of wheels, including the aforementioned front roller 41 and rear roller 42. These wheels are adapted to travel along the working surface, and the distance between the blade 71 and the working surface is between 3mm and 10mm. By controlling the distance between the blade 71 and the working surface within a certain range, the air pressure within the cutting space 14 can be controlled within a preset range.

[0074] refer to Figure 8 The impeller 72 further includes a plurality of turbulence baffles 724 extending from the mounting plate 722 toward the side away from the blade 71. One end of each of the turbulence baffles 724 near the bushing 721 surrounds the bushing 721 and forms a guide channel 725 between the bushing 721 and the bushing 721. An air intake channel 726 is formed between adjacent turbulence baffles 724, and the air intake channel 726 communicates with the guide channel 725.

[0075] The impeller 72 further includes an outer baffle 727 mounted on the mounting plate 722 near the blade 71. After the blade 71 is mounted on the mounting plate 722, the outer baffle 727 is located outside the blade 71, serving to limit the movement of the blade 71 and improve its stability during operation. Preferably, there are two outer baffles 727, respectively disposed on opposite sides of the blade 71.

[0076] The cutting mechanism 70 further includes a cutting cover 75, which is mounted on the bottom of the lawnmower body 10 and has an opening facing the working surface. The cutting cover 75 surrounds and forms the cutting space 14, and the end of the drive shaft 61 extends through the cutting cover 75 into the cutting space 14.

[0077] Specifically, the cutting cover 75 has a shaft hole 751 and a vent hole 752 at a predetermined position on its top. There are multiple vent holes 752, and these vent holes 752 are spaced apart from each other around the shaft hole 751. The drive shaft 61 is rotatably mounted in the shaft hole 751. The top of the cutting cover 75 has a baffle 753 extending into the cutting space 14 at a predetermined position, and the baffle 753 surrounds the outside of the impeller 72. A notch 7530 is provided at a predetermined position on the baffle 753, which connects the air intake channel 726 to the cutting space 14.

[0078] When the impeller 72 rotates within the space surrounded by the baffle 753, it drives gas through the notch 7530 into the cutting space 14, thereby driving material debris generated within the cutting space 14 into the collection device. Furthermore, because the cutting cover 75 is provided with the vent 752, the impeller 72 also accelerates heat dissipation from the working drive mechanism 60 during operation.

[0079] refer to Figure 8 Furthermore, the bushing 721 and the mounting plate 722 are connected by a first arc-shaped surface; the spoiler 724 has a second arc-shaped surface at one end near the bushing 721, the second arc-shaped surface at one end near the bushing 721 is at a first distance from the mounting plate 722, and the second end away from the bushing 721 is at a second distance from the mounting plate 722, the second distance being greater than the first distance.

[0080] refer to Figure 12 In some embodiments, the blade 71 is a double-bladed blade. (See reference...) Figure 11 In some embodiments, the blade 71 is a single-blade blade.

[0081] refer to Figure 1 and Figure 2 The lawnmower body 10 has a collection box 15 at its rear, where debris generated during the operation of the cutting mechanism 70 can be collected. An operating arm 16 is located above the lawnmower body 10, with several control buttons at one end. Operating these buttons controls the movement and operation of the lawnmower body 10. A combing component 17 is located at the front of the lawnmower body 10. During the forward movement of the lawnmower body 10, the combing component 17 allows the weeds to enter the cutting mechanism 70 in a relatively smooth manner.

[0082] refer to Figure 4 The lawnmower body 10 includes a bottom housing 18, which surrounds the cutting cover 75. A combing component 17 is positioned above the bottom housing 18, forming a rotation channel 11 between the combing component 17 and the bottom housing 18. Specifically, a receiving plate 181 is positioned at a predetermined location on the bottom housing 18, and a receiving groove 182 is formed on the top of the receiving plate 181. The support shaft 311 is rotatably mounted in the receiving groove 182. Preferably, there are two receiving plates 181, their positions corresponding to the two ends of the support shaft 311. When the combing component 17 is installed on the bottom housing 18, it covers the receiving groove 182 to limit the movement of the support shaft 311.

[0083] Those skilled in the art should understand that the embodiments of the present invention described above and shown in the accompanying drawings are merely examples and do not limit the present invention. The advantages of the present invention have been fully and effectively realized. The functions and structural principles of the present invention have been shown and explained in the embodiments, and any modifications or variations may be made to the implementation of the present invention without departing from the stated principles.

Claims

1. A lawnmower, characterized in that, include: Lawn mower body; A walking drive mechanism, the walking drive mechanism including a walking motor, the walking motor being mounted on the lawnmower body; A rotating shaft, comprising a front roller and a rear roller, wherein the front roller is mounted at the front end of the lawnmower body and the rear roller is mounted at the rear end of the lawnmower body, and the walking drive mechanism is connected to the rear roller for driving the rear roller to rotate; A rolling assembly includes a front roller and a rear roller, the front roller being mounted on a front axle and the rear roller being mounted on a rear axle; both the front and rear rollers include a tire body, the tire body having a tread with deep tread areas and shallow tread areas, which are alternately arranged along the circumferential direction of the tire body; the deep tread areas have a first tread, the surface of which is provided with a plurality of first protrusions; the shallow tread areas have a second tread, the surface of which is provided with a plurality of second protrusions; the distance between the first tread and the center of the tire body is less than the distance between the second tread and the center of the tire body, and the surfaces of the first protrusions away from the first tread and the surfaces of the second protrusions away from the second tread are located on the same circular surface; The ratio of the diameter of the front roller to the diameter of the rear roller is between 0.6 and 1, and the torque of the walking motor is between 2 Nm and 10 Nm.

2. The lawnmower according to claim 1, characterized in that, The diameter of the front roller is between 150mm and 200mm, and the diameter of the rear roller is between 200mm and 250mm.

3. The lawnmower according to claim 1, characterized in that, The front roller includes a support shaft, a first lifting shaft, a second lifting shaft, a first lifting arm, and a second lifting arm. One end of the first lifting arm and one end of the second lifting arm are respectively fixed to the two ends of the support shaft, and the first lifting arm and the second lifting arm are both staggered with the support shaft. The first lifting shaft is rotatably mounted on the other end of the first lifting arm, and the second lifting shaft is rotatably mounted on the other end of the second lifting arm. The two front rollers are respectively mounted on the first lifting shaft and the second lifting shaft. The first lifting shaft and the second lifting shaft are coaxially arranged, and the central axis of the first lifting shaft and the second lifting shaft is parallel to the central axis of the support shaft.

4. The lawnmower according to claim 3, characterized in that, The front end of the lawnmower body has a rotation channel arranged along the width direction of the lawnmower at a preset position. The two sides of the lawnmower body corresponding to the position of the rotation channel have a first lifting channel and a second lifting channel, respectively. The first lifting channel and the second lifting channel are both connected to the rotation channel. The support shaft is rotatably mounted on the rotation channel, the first lifting arm is mounted on the first lifting channel, and the second lifting arm is mounted on the second lifting channel; The end of the first lifting shaft away from the first lifting arm extends to the outside of the first lifting channel, and the end of the second lifting shaft away from the second lifting arm extends to the outside of the second lifting channel.

5. The lawnmower according to claim 4, characterized in that, The lawnmower further includes a push mechanism installed on the lawnmower body. The push mechanism includes a drive member, a front push arm, and a front connecting arm. One end of the front push arm is fixed to the support shaft, and the front push arm and the support shaft are interleaved. The other end of the front push arm is rotatably connected to one end of the front connecting arm, and the other end of the front connecting arm is connected to the drive member. When the drive unit moves the front connecting arm, it can drive the support shaft to rotate in the rotation channel through the front push arm, thereby driving the first lifting arm to rotate in the first lifting channel and the second lifting arm to rotate in the second lifting channel, so as to adjust the position of the first lifting shaft in the first lifting channel and the position of the second lifting shaft in the second lifting channel.

6. The lawnmower according to claim 1, characterized in that, The thickness of the first protrusion ranges from 4mm to 8mm, and the thickness of the second protrusion ranges from 2mm to 5mm.

7. The lawnmower according to claim 1, characterized in that, In the deep tread area, an annular groove is provided around the first tread, and a connecting protrusion is provided at the middle position of the tread of the tire body, which is circumferentially arranged around the tire body. The connecting protrusion is connected to a plurality of first protrusions and a plurality of second protrusions.

8. The lawnmower according to claim 7, characterized in that, Along the axial direction of the tire body, both the first protrusion and the second protrusion have a structure that is wide in the middle and narrow at both ends; Both the first protrusion and the second protrusion have an extension groove on the surface of the side away from the center of the tire body, and the extension groove extends along the axial direction of the tire body.

9. The lawnmower according to claim 8, characterized in that, Along the circumferential direction of the tire body, the length of the deep tread region is greater than the length of the shallow tread region, and the number of the first protrusions in the deep tread region is greater than the number of the second protrusions in the shallow tread region, and the distance between adjacent first protrusions is less than the distance between adjacent second protrusions.

10. The lawnmower according to claim 9, characterized in that, The surface of the tire body away from the lawnmower body has a side groove corresponding to the shallow tread area and a side protrusion corresponding to the deep tread area.

Images