Walk-behind work machine

Abstract

Provided is a walk-behind work machine. The walk-behind work machine comprises a main unit (100). The main unit (100) comprises a battery pack (110), a cutting assembly (120) and a chassis (130), wherein the cutting assembly (120) comprises a cutting blade (121) for cutting vegetation and a cutting electric motor (122); the chassis (130) accommodates at least part of the cutting assembly (120); an output shaft (140) is mounted on the chassis (130) to drive the cutting blade (121); and the maximum diameter D of the inner wall of the chassis (130) that passes through the output axis of the output shaft (140) is greater than 22 inches and less than or equal to 30 inches. The walk-behind work machine has higher mowing efficiency than existing single-blade-disc mowers and lower manufacturing costs than existing double-blade-disc mowers, balancing high mowing efficiency with low manufacturing costs, thereby better meeting the requirements of users during use.

Description

A type of rear-walking working machine

[0001] This application claims priority to Chinese patent application No. 202510125233.2, filed on January 24, 2025, the entire contents of which are incorporated herein by reference. Technical Field

[0002] This application relates to an electric device, specifically a rear-walking working machine. Background Technology

[0003] One type of walk-behind machine in related technologies is the lawnmower. As a garden tool, lawnmowers are widely used in homes, hotels, botanical gardens, and other places where lawn mowing and other vegetation trimming are required. Existing lawnmowers are categorized by the number of blades: single-disc mowers and dual-disc mowers. Single-disc mowers typically have 21-inch or 22-inch blades, while dual-disc mowers generally have 30-inch blades. However, existing single-disc mowers have lower mowing efficiency, while dual-disc mowers have higher manufacturing costs.

[0004] This section provides background information related to this application, which is not necessarily prior art. Summary of the Invention

[0005] One object of this application is to solve or at least alleviate some or all of the aforementioned problems. To this end, one object of this application is to provide a rear-walking work machine that balances mowing efficiency and manufacturing cost.

[0006] To achieve the above objectives, this application adopts the following technical solution:

[0007] A walk-behind machine includes: a main unit including a battery pack; a cutting assembly including a cutting blade for cutting vegetation and a cutting motor; a chassis housing at least a portion of the cutting assembly, the chassis having an output shaft mounted on it to drive the cutting blade; the maximum diameter D of the output axis of the output shaft passing through the inner wall of the chassis is greater than 22 inches and less than or equal to 30 inches.

[0008] In some embodiments, the maximum diameter D of the output axis of the output shaft passing through the inner wall of the chassis is set to 26 inches.

[0009] In some embodiments, the distance L from the tip of the cutting blade to the inner wall of the chassis is greater than or equal to 5 mm and less than or equal to 30 mm.

[0010] In some embodiments, the linear velocity of the cutting blade is greater than or equal to 50 m / s and less than or equal to 100 m / s.

[0011] In some embodiments, the maximum output power of the cutting motor is greater than or equal to 3000W.

[0012] In some embodiments, when the cutting motor has maximum cutting efficiency, the power of the cutting motor is greater than or equal to 1400W.

[0013] In some embodiments, the cutting motor rotates at a speed greater than or equal to 1400 rad / s and less than or equal to 3600 rad / s.

[0014] In some embodiments, the rated voltage of the battery pack is greater than or equal to 36V.

[0015] A rear-walking machine includes: a main unit, the main unit including: a battery pack; a cutting assembly including a cutting blade for cutting vegetation; a chassis housing at least a portion of the cutting assembly, the chassis having an output shaft mounted to drive the cutting blade; the sweeping area S of the cutting blade in one revolution is greater than or equal to 0.25 m² and less than or equal to 0.46 m².

[0016] In some embodiments, the sweep area S of one revolution of the cutting blade is 0.34 m².

[0017] In some embodiments, the maximum diameter D of the output axis of the output shaft passing through the inner wall of the chassis is set to 26 inches.

[0018] In some embodiments, the distance L from the tip of the cutting blade to the inner wall of the chassis is greater than or equal to 5 mm and less than or equal to 30 mm.

[0019] In some embodiments, the linear velocity of the cutting blade is greater than or equal to 50 m / s and less than or equal to 100 m / s.

[0020] In some embodiments, the cutting assembly further includes a cutting motor for driving the cutting blade, the cutting motor having a maximum output power greater than or equal to 3000W.

[0021] In some embodiments, the cutting assembly further includes a cutting motor for driving the cutting blade, wherein the power of the cutting motor is greater than or equal to 1400W when the cutting motor has maximum cutting efficiency.

[0022] In some embodiments, the cutting assembly further includes a cutting motor for driving the cutting blade, the cutting motor having a rotational speed greater than or equal to 1400 rad / s and less than or equal to 3600 rad / s.

[0023] In some embodiments, the rated voltage of the battery pack is greater than or equal to 36V.

[0024] A rear-walking machine includes: a main unit, the main unit comprising: a walking assembly including a front walking wheel and a rear walking wheel; a cutting assembly including a cutting blade for cutting vegetation and a cutting motor; a chassis housing at least a portion of the cutting assembly, an output shaft mounted on the chassis, the cutting motor being configured to drive the cutting blade by driving the output shaft; the ratio of the motor diameter D1 of the cutting motor to the length L1 of the cutting blade being greater than or equal to 0.1 and less than or equal to 0.6; the distance L2 between the central axis of the front walking wheel and the central axis of the rear walking wheel being greater than or equal to 600 mm and less than or equal to 1100 mm.

[0025] In some embodiments, the walking assembly includes a left walking wheel and a right walking wheel, wherein the distance W between the outer sides of the left walking wheel and the outer sides of the right walking wheel is less than the length L1 of the cutting blade.

[0026] In some embodiments, the sweep area S of one revolution of the cutting blade is 0.34 m².

[0027] In some embodiments, the maximum diameter D of the output axis of the output shaft passing through the inner wall of the chassis is set to 26 inches.

[0028] In some embodiments, the distance L from the tip of the cutting blade to the inner wall of the chassis is greater than or equal to 5 mm and less than or equal to 30 mm.

[0029] In some embodiments, the linear velocity of the cutting blade is greater than or equal to 50 m / s and less than or equal to 100 m / s.

[0030] In some embodiments, the maximum output power of the cutting motor is greater than or equal to 3000W.

[0031] In some embodiments, when the cutting motor has maximum cutting efficiency, the power of the cutting motor is greater than or equal to 1400W.

[0032] In some embodiments, the cutting motor rotates at a speed greater than or equal to 1400 rad / s and less than or equal to 3600 rad / s.

[0033] In some embodiments, the cutting assembly further includes a battery pack with a rated voltage greater than or equal to 36V. Attached Figure Description

[0034] Figure 1 is a schematic diagram of the structure of a rear-walking working machine;

[0035] Figure 2 is a schematic diagram of the main body of the rear-walking machine;

[0036] Figure 3 is a cross-sectional view of part of the main structure of the rear-walking machine;

[0037] Figure 4 is an exploded view of part of the main structure of the walking machine;

[0038] Figure 5 is a schematic diagram of the maintenance compartment and electronic components of the rear-walking machine;

[0039] Figure 6 is a bottom view of the chassis, output shaft, and cutting blade of the rear-walking machine.

[0040] Figure 7 is a side view of the structure shown in Figure 6;

[0041] Figure 8 is a cross-sectional view along direction AA in Figure 7;

[0042] Figure 9 is a schematic diagram of the chassis of the rear-walking machine;

[0043] Figure 10 is a top view of the chassis of the rear-walking machine;

[0044] Figure 11 is a cross-sectional view along the BB direction in Figure 10;

[0045] Figure 12 is a schematic diagram of the walking assembly of the rear-walking machine in the first operating mode;

[0046] Figure 13 is a schematic diagram of the walking assembly of the rear-walking machine in the second operating mode;

[0047] Figure 14 is a schematic diagram of the first handle mechanism of the rear-walking working machine;

[0048] Figure 15 is a schematic diagram of the second handle mechanism of the rear-walking machine.

[0049] In the picture:

[0050] 100. Host computer;

[0051] 110. Battery pack; 111. First battery pack; 112. Second battery pack;

[0052] 120. Cutting assembly; 121. Cutting blade; 122. Cutting motor; 1221. Fan;

[0053] 130. Chassis; 1301. First mounting part; 1302. Second mounting part; 1303. Handle mounting part; 1304. First receiving cavity; 1305. Blade receiving part; 1306. Third mounting part; 1307. Stepped surface; 1308. Motor receiving part;

[0054] 140. Output shaft;

[0055] 150. Walking assembly; 151. Front walking wheel; 152. Rear walking wheel; 1501. Left walking wheel; 1502. Right walking wheel;

[0056] 160. Main unit casing;

[0057] 170. Adjustment mechanism; 1701. First gear plate; 1702. Second gear plate; 1703. Connecting mechanism; 1704. First operating component; 1705. Second operating component;

[0058] 180. Battery pack compartment; 1801. Main body; 18011. Guide section; 18012. Joint section; 1802. Battery compartment cover;

[0059] 190. Maintenance compartment; 1901. Second receiving cavity; 1902. Receiving cavity cover;

[0060] 200. Operating mechanism; 210. First handle mechanism; 220. Second handle mechanism; 201. Handle part; 202. Connecting rod; 2021. First rod; 2022. Second rod; 203. Handle connector;

[0061] 300. Grass collection bags;

[0062] 400. Electronic components; 410. Motor control board; 420. Power control board. Detailed Implementation

[0063] Before explaining any implementation of this application in detail, it should be understood that this application is not limited to its application to the structural details and component arrangements set forth in the following description or shown in the above drawings.

[0064] In this application, the terms "comprising," "including," "having," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes that element.

[0065] In this application, the term "and / or" describes the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent three cases: A existing alone, A and B existing simultaneously, and B existing alone. Additionally, the character " / " in this application generally indicates that the preceding and following related objects have an "and / or" relationship.

[0066] In this application, the terms "connection," "combination," "coupling," and "installation" can refer to direct connection, combination, coupling, or installation, or indirect connection, combination, coupling, or installation. For example, a direct connection refers to two parts or components being connected together without the need for an intermediary, while an indirect connection refers to two parts or components each being connected to at least one intermediary, with the connection achieved through the intermediary. Furthermore, "connection" and "coupling" are not limited to physical or mechanical connections or couplings, but can also include electrical connections or couplings.

[0067] In this application, those skilled in the art will understand that relative terms (e.g., “about,” “approximately,” “basically,” etc.) used in conjunction with quantities or conditions are to include the values ​​and have the meaning indicated by the context. For example, such relative terms include at least the degree of error associated with the measurement of a particular value, tolerances associated with the particular value due to manufacturing, assembly, use, etc. Such terms should also be considered as disclosing a range defined by the absolute values ​​of the two endpoints. Relative terms may refer to a certain percentage (e.g., 1%, 5%, 10% or more) of the indicated value. Numerical values ​​that do not use relative terms should also be disclosed as specific values ​​with tolerances. Furthermore, “basically” when expressing relative angular relationships (e.g., substantially parallel, substantially perpendicular) may refer to a certain degree (e.g., 1 degree, 5 degrees, 10 degrees or more) added to or subtracted from the indicated angle.

[0068] In this application, those skilled in the art will understand that the function performed by a component can be performed by one component, multiple components, one part, or multiple parts. Similarly, the function performed by a part can also be performed by one part, one component, or a combination of multiple parts.

[0069] In this application, the directional terms "upper," "lower," "left," "right," "front," and "rear" are used to describe the orientation and positional relationships shown in the accompanying drawings and should not be construed as limiting the embodiments of this application. Furthermore, in the context, it should be understood that when an element is mentioned as being connected "upper" or "lower" to another element, it can be directly connected to the other element "upper" or "lower," or indirectly connected through an intermediate element. It should also be understood that directional terms such as upper side, lower side, left side, right side, front side, and rear side not only represent positive orientation but can also be understood as lateral orientation. For example, "below" can include directly below, lower left, lower right, lower front, and lower rear.

[0070] This application provides a rear-walking work machine, specifically a single-disc lawn mower. As shown in Figures 1 to 8, the rear-walking work machine includes a main unit 100, an operating mechanism 200, a grass collection bag 300, and electronic components 400.

[0071] The main unit 100 is the main structure of the entire walk-behind machine. The main unit 100 includes a battery pack 110, a cutting assembly 120, a chassis 130, an output shaft 140, a walking assembly 150, a main unit housing 160, an adjustment mechanism 170, a battery compartment 180, and a maintenance compartment 190. The battery pack 110 powers the cutting motor 122. The cutting assembly 120 includes a cutting blade 121 for cutting vegetation and a cutting motor 122. The cutting motor 122 drives the cutting blade 121 to rotate via the output shaft 140 to cut grass. The output shaft 140 is mounted on the chassis 130. The chassis 130 houses at least a portion of the cutting assembly 120. The chassis 130 also mounts the walking assembly 150 and the adjustment mechanism 170. The walking assembly 150 is mounted on the chassis 130 and supports the chassis 130. The main unit housing 160 primarily mounts the battery pack 110 and electronic components 400. The adjustment mechanism 170 is used to adjust the cutting height.

[0072] The operating mechanism 200 is connected to the rear of the main unit 100 and is used by the user to operate the walk-behind machine by hand. The grass collection bag 300 is also connected to the rear of the main unit 100 and located below the operating mechanism 200. The grass collection bag 300 is used to collect the grass clippings generated during the walk-behind machine's mowing operations. The electronic component 400 is electrically connected to the cutting motor 122 and is used to control the power output of the walk-behind machine.

[0073] The structure of the host 100 will be described in detail below with reference to Figures 1 to 13.

[0074] The chassis 130 is a shell structure arranged in the front-to-back direction. The chassis 130 has a first receiving cavity 1304 for accommodating the cutting motor 122, and also has a blade receiving portion 1305 for accommodating the cutting blade 121. The blade receiving portion 1305 is formed in the lower half of the first receiving cavity 1304. In this embodiment, the first receiving cavity 1304 is a stepped hole, including a smaller, upper-positioned motor receiving portion 1308 and a larger, lower-positioned blade receiving portion 1305 for the cutting blade 121. A stepped surface 1307 is formed in the middle portion of the first receiving cavity 1304. When the cutting motor 122 is disposed within the first receiving cavity 1304, the motor housing of the cutting motor 122 abuts against the stepped surface 1307. The motor shaft of the cutting motor 122 forms an output shaft 140, or the motor shaft of the cutting motor 122 is connected to the output shaft 140, which extends along the output axis a direction shown in FIG3. A cutting blade 121 is connected to the output shaft 140. Driven by the cutting motor 122, the cutting blade can rotate around axis a, thereby cutting the vegetation.

[0075] In some embodiments, as shown in FIG6, the maximum diameter D of the output axis through the output shaft 140 on the inner wall of the chassis 130 is greater than 22 inches and less than or equal to 30 inches. In a specific embodiment, the maximum diameter D of the output axis through the output shaft 140 on the inner wall of the chassis 130 is 23 inches, 24 inches, 25 inches, 26 inches, 27 inches, 28 inches, 29 inches, or 30 inches. Of course, in addition to these values, the maximum diameter D of the output axis through the output shaft 140 on the inner wall of the chassis 130 can also be other values ​​within the range of 22 inches to 30 inches.

[0076] In some embodiments, as shown in FIG8, the distance L from the tip of the cutting blade 121 to the inner wall of the chassis 130 is greater than or equal to 5 mm and less than or equal to 30 mm. In a specific embodiment, the distance L from the tip of the cutting blade 121 to the inner wall of the chassis 130 is 5 mm, 6 mm, 7 mm, 8 mm, 9 mm, 10 mm, 11 mm, 12 mm, 13 mm, 14 mm, 15 mm, 16 mm, 17 mm, 18 mm, 19 mm, 20 mm, 21 mm, 22 mm, 23 mm, 24 mm, 25 mm, 26 mm, 27 mm, 28 mm, 29 mm, or 30 mm. Of course, in addition to these values, the distance L from the tip of the cutting blade 121 to the inner wall of the chassis 130 can also be other values ​​within the range of 5 mm to 30 mm.

[0077] In some embodiments, the linear velocity of the cutting blade 121 is greater than or equal to 50 m / s and less than or equal to 100 m / s. In a specific embodiment, the linear velocity of the cutting blade 121 is 50 m / s, 55 m / s, 60 m / s, 65 m / s, 70 m / s, 75 m / s, 80 m / s, 85 m / s, 90 m / s, 95 m / s, or 100 m / s. Of course, in addition to these values, the linear velocity of the cutting blade 121 can also be other values ​​within the range of 50 m / s to 100 m / s.

[0078] In some embodiments, the sweeping area S of one revolution of the cutting blade 121 is greater than or equal to 0.25 m² and less than or equal to 0.46 m². In this embodiment, the 'sweeping area of ​​one revolution of the cutting blade 121' (also referred to as 'sweeping area per revolution') refers to the area of ​​the closed region enclosed by all the blade tip trajectories on the horizontal plane when the lawnmower is in a stationary working state (i.e., the machine body is not moving), and its rotating blades have rotated a full 360° around the central axis. This area is an inherent property of the blade assembly geometry and installation method. In one specific embodiment, the sweeping area S of one revolution of the cutting blade 121 is 0.25㎡, 0.26㎡, 0.27㎡, 0.28㎡, 0.29㎡, 0.30㎡, 0.31㎡, 0.32㎡, 0.33㎡, 0.34㎡, 0.35㎡, 0.36㎡, 0.37㎡, 0.38㎡, 0.39㎡, 0.40㎡, 0.41㎡, 0.42㎡, 0.43㎡, 0.44㎡, 0.45㎡, or 0.46㎡. Of course, besides these values, the sweeping area S of one revolution of the cutting blade 121 can also be other values ​​within the range of 0.25㎡-0.46㎡. By optimizing the blade assembly design and controlling the sweeping area within a certain range, an optimal balance can be achieved between power consumption, cutting efficiency, and uniformity of grass clipping dispersion. Too small a scanning area leads to low efficiency, while too large a scanning area requires greater driving torque and is prone to stalling.

[0079] In some embodiments, the weight of the cutting blade 121 is greater than or equal to 600g. In one embodiment, the weight of the cutting blade 121 is 600g, 610g, 620g, 630g, 640g, 650g, 660g, 670g, 680g, 690g, or 700g. Of course, in addition to these values, the weight of the cutting blade 121 can also be other values ​​within the range of 600g or greater.

[0080] In some embodiments, the maximum output power of the cutting motor 122 is greater than or equal to 3000W. In one specific embodiment, the maximum output power of the cutting motor 122 is 3000W, 3100W, 3200W, 3300W, 3400W, 3500W, 3600W, 3700W, 3800W, 3900W, or 4000W. Of course, in addition to these values, the maximum output power of the cutting motor 122 can also be other values ​​within the range of 3000W or greater.

[0081] In some embodiments, when the cutting motor 122 has maximum cutting efficiency, the power of the cutting motor 122 is greater than or equal to 1400W. In some embodiments, when the cutting motor 122 has maximum cutting efficiency, the power of the cutting motor 122 is greater than or equal to 1500W. In some embodiments, when the cutting motor 122 has maximum cutting efficiency, the power of the cutting motor 122 is greater than or equal to 1600W. In some embodiments, when the cutting motor 122 has maximum cutting efficiency, the power of the cutting motor 122 is greater than or equal to 1700W.

[0082] In one specific embodiment, when the cutting motor 122 has maximum cutting efficiency, the power of the cutting motor 122 is 1400W, 1450W, 1500W, 1550W, 1600W, 1650W, 1700W, 1750W, 1800W, 1850W, 1900W, 1950W, or 2000W. Of course, besides these values, the power of the cutting motor 122 can also be other values ​​within the range of 1400W-2000W when the cutting motor 122 has maximum cutting efficiency.

[0083] In some embodiments, the rotational speed of the cutting motor 122 is greater than or equal to 1400 rad / s and less than or equal to 3600 rad / s. In a specific embodiment, the rotational speed of the cutting motor 122 is 1400 rad / s, 1500 rad / s, 1600 rad / s, 1700 rad / s, 1800 rad / s, 1900 rad / s, 2000 rad / s, 2100 rad / s, 2200 rad / s, 2300 rad / s, 2400 rad / s, 2500 rad / s, 2600 rad / s, 2700 rad / s, 2800 rad / s, 2900 rad / s, 3000 rad / s, 3100 rad / s, 3200 rad / s, 3300 rad / s, 3400 rad / s, 3500 rad / s, or 3600 rad / s. Of course, in addition to these values, the rotational speed of the cutting motor 122 can also be other values ​​within the range of 1400 rad / s to 3600 rad / s.

[0084] In some embodiments, the weight of the cutting motor 122 is greater than or equal to 2 kg. In one specific embodiment, the weight of the cutting motor 122 is 2.1 kg, 2.2 kg, 2.3 kg, 2.4 kg, 2.5 kg, 2.6 kg, 2.7 kg, 2.8 kg, 2.9 kg, or 3.0 kg. Of course, in addition to these values, the weight of the cutting motor 122 can also be other values ​​within the range of greater than or equal to 2 kg.

[0085] In some embodiments, as shown in Figures 3 and 6, the ratio of the motor diameter D1 of the cutting motor 122 to the length L1 of the cutting blade 121 is greater than or equal to 0.1 and less than or equal to 0.6. It should be noted that the motor diameter D1 of the cutting motor 122 here refers to the diameter of the disc inside the motor housing 100. In some embodiments, the ratio of the motor diameter D1 of the cutting motor 122 to the length L1 of the cutting blade 121 is greater than or equal to 0.15 and less than or equal to 0.5; in some embodiments, the ratio of the motor diameter D1 of the cutting motor 122 to the length L1 of the cutting blade 121 is greater than or equal to 0.1 and less than or equal to 0.4.

[0086] In one specific embodiment, the ratio of the motor diameter D1 of the cutting motor 122 to the length L1 of the cutting blade 121 is 0.1, 0.2, 0.3, 0.4, 0.5, or 0.6. Of course, in addition to these values, the ratio of the motor diameter D1 of the cutting motor 122 to the length L1 of the cutting blade 121 can also be other values ​​within the range of 0.1-0.6.

[0087] The rear-walking mower provided in this application includes a main unit, which comprises a battery pack, a cutting assembly, and a chassis. The cutting assembly includes cutting blades for cutting vegetation and a cutting motor. The chassis houses at least a portion of the cutting assembly, and an output shaft is mounted on the chassis to drive the cutting blades. The maximum diameter D of the output axis through the inner wall of the chassis is greater than 22 inches and less than or equal to 30 inches. This rear-walking mower achieves this by setting the maximum diameter D of the output axis through the inner wall of the chassis to be greater than 22 inches and less than or equal to 30 inches. Compared to existing single-disc mowers, the rear-walking mower provided in this application has higher mowing efficiency; compared to existing dual-disc mowers, it has lower manufacturing costs, balancing high mowing efficiency and low manufacturing costs, thus better meeting user needs.

[0088] The main unit housing 160 is a shell-like structure extending in the front-to-back direction. The main unit housing 160 is a shell-like structure positioned above the chassis 130. In this embodiment, the main unit housing 160 and the chassis 130 are two independent housings fixed together by a connector. Of course, in other embodiments, the main unit housing 160 and the chassis 130 can be a single molded component, as long as it meets the requirements for installing other functional components. The main unit housing 160 can be a housing formed by plastic injection molding, a housing formed by sheet metal stamping, or a metal housing formed by die casting.

[0089] The battery compartment 180 is used to install the battery pack 110, and is located vertically above the first receiving cavity 1304. Specifically, the battery compartment 180 includes a main body 1801 formed in the main housing 160 and a battery compartment cover 1802 that can be opened and closed and connected to the main body 1801. The main body 1801 is used to accommodate the battery pack 110, and the battery compartment cover 1802 is used to fasten onto the main body 1801 after the battery pack 110 is placed in the battery compartment 180, thereby protecting the battery pack 110. The battery pack 110 placed in the battery compartment 180 can be electrically connected to the cutting motor 122 to supply power to the cutting motor 122.

[0090] In some specific embodiments, the battery pack compartment 180 is provided with at least two connecting portions 18012 for detachably connecting the battery pack 110 to the main housing 160, and guide portions 18011 for guiding the battery pack 110 to connect to the connecting portions 18012 along the insertion direction b. The insertion direction b forms an acute angle with the direction of the output axis a, and the battery pack 110 partially overlaps with the cutting motor 122 along the direction of the output axis a. It should be noted that the guide portion 18011 is a guide slope formed in the battery pack compartment 180, and the connecting portion 18012 is a spring-loaded slot formed in the battery pack compartment 180. The spring-loaded slot can engage with the buckle on the battery pack 110, thereby fixing and limiting the battery pack 110.

[0091] This rear-walking cutting machine improves the utilization of the internal space of the main housing 160 by setting the angle between the insertion direction b and the output axis a of the output shaft 140 to an acute angle, and by partially overlapping the battery pack 110 and the cutting motor 122 along the output axis a. This facilitates the application of force when inserting or removing the battery pack 110, thus improving the user experience. It should be noted that this application does not impose specific limitations on the size of the angle between the insertion direction b and the output axis a. Within the acute angle range, as long as it satisfies the requirements of improving the utilization of the internal space of the main housing 160, facilitating the miniaturization of the rear-walking cutting machine, and facilitating the application of force when inserting or removing the battery pack 110, it is acceptable.

[0092] Furthermore, a plane passing through the center of the battery pack 110 and parallel to the insertion direction b is defined as the first plane. Along the pushing direction c of the rear-walking machine, the battery pack 110 includes a front portion located in front of the first plane and a rear portion located behind the first plane. In some specific embodiments, along the output axis a, the lowest point of the front portion of the battery pack 110 is lower than the highest point of the cutting motor 122. This arrangement can make full use of the vertical space of the main housing 160 and the chassis 130, further improving the structural compactness of the components within the main unit 100, thereby further improving space utilization.

[0093] Optionally, in some more specific embodiments, the number of battery packs 110 is one, located in front of the output axis a along the pushing direction c of the rear-walking machine. Since the battery pack 110 is located on the main housing 160 in front of the output axis a, the center is shifted forward, making the structure more stable. Therefore, placing the battery pack 110 in front of the output axis a makes it easier to operate and ensures the structural stability of the entire main unit 100.

[0094] Optionally, in some parallel embodiments, the number of battery packs 110 is at least two. Correspondingly, at least two main body portions 1801 are provided on the main housing 160 at intervals along the horizontal direction, where the horizontal direction refers to the front-to-back horizontal direction along the pushing direction c. Each main body portion 1801 is provided with a connecting portion 18012, and at least two battery packs 110 are inserted into the at least two main body portions 1801 in a one-to-one correspondence.

[0095] Optionally, in this embodiment, two battery packs 110 are provided. The two battery packs 110 include a first battery pack 111 and a second battery pack 112. The main body 1801 includes a first main body 1801 located in front of the output axis a and a second main body 1801 located behind the output axis a. The first battery pack 111 is inserted into the first main body 1801, and the second battery pack 112 is inserted into the second main body 1801.

[0096] Furthermore, the first battery pack 111 is inserted into the first main body 1801 along a first insertion direction, and the angle between the first insertion direction and the direction of the output axis a is a first acute angle. The second battery pack 112 is inserted into the second main body 1801 along a second insertion direction, and the angle between the second insertion direction and the direction of the output axis a is a second acute angle. It should be noted that the first acute angle and the second acute angle can be set to be the same or different as required. In some specific embodiments, the first acute angle and the second acute angle are the same to reduce the design and manufacturing difficulty of the two main bodies 1801 of the main casing 160; while in some other embodiments, the first acute angle and the second acute angle may not be equal, so that the display portions of the end faces of the two battery packs 110 of the first battery pack 111 and the second battery pack 112 can face the operator, making it convenient for the user to insert and remove the battery packs 110.

[0097] Furthermore, the lowest point of the first battery pack 111 and the lowest point of the second battery pack 112 are located in the same plane; the highest point of the first battery pack 111 and the highest point of the second battery pack 112 are also located in the same plane. This arrangement allows the two battery packs 110, the first battery pack 111 and the second battery pack 112, to be arranged side by side in space, resulting in a more compact layout.

[0098] Furthermore, along the output axis a, the first battery pack 111 and the second battery pack 112 do not overlap. This avoids interference between the first battery pack 111 and the second battery pack 112 in the output axis a direction, and prevents the phenomenon that the two battery packs 110 must be inserted or removed in a preset order, thus ensuring the flexibility of inserting and removing the battery packs 110.

[0099] Furthermore, the distance d between the first battery pack 111 and the second battery pack 112 is greater than 30mm. This avoids the distance between the two battery packs 110 being too close, and also avoids the thickness of the structure on the main unit housing 160 located between the first battery pack 111 and the second battery pack 112 being too small to support the weight of the two battery packs 110.

[0100] In some embodiments, the rated voltage of the battery pack 110 is greater than or equal to 36V. In one specific embodiment, the rated voltage of the battery pack 110 is 36V, 37V, 38V, 39V, 40V, 41V, 42V, 43V, 44V, or 45V. Of course, in addition to these values, the rated voltage of the battery pack 110 may also be other values ​​within the range of 36V or greater.

[0101] The electronic component 400 controls the power output of the cutting motor 122. A maintenance compartment 190 is formed or connected to the main housing 160 or chassis 130. The maintenance compartment 190 includes a second receiving cavity 1901 for accommodating the electronic component 400. The second receiving cavity 1901 has an opening, which is closable and connected to a receiving cavity cover 1902. Opening the receiving cavity cover 1902 opens the opening, allowing the electronic component 400 to be installed into or removed from the second receiving cavity 1901. After the electronic component 400 is installed into the second receiving cavity 1901, closing the receiving cavity cover 1902 closes the opening, thereby protecting the electronic component 400. In this embodiment, the second receiving cavity 1901 is formed on the main housing 160 and along the pushing direction c of the rear-walking machine. The second receiving cavity 1901 is located behind the first receiving cavity 1304 and the battery pack compartment 180.

[0102] The electronic component 400 generates a large amount of heat during operation. If this heat accumulates in the second receiving cavity 1901 and cannot dissipate quickly, the temperature inside the second receiving cavity 1901 will become too high, causing the electronic component 400 to malfunction. In some embodiments, the first receiving cavity 1304 and the second receiving cavity 1901 are connected through an air duct. The output end of the cutting motor 122 is connected to or has a fan 1221. When the cutting motor 122 rotates, the fan 1221 generates cooling air, which flows from the second receiving cavity 1901 to the first receiving cavity 1304 and then out of the first receiving cavity 1304.

[0103] This rear-mounted machine connects the first receiving cavity 1304 and the second receiving cavity 1901 via an air duct. A fan 1221 is connected to or forms the output end of the cutting motor 122. When the cutting motor 122 rotates, the fan 1221 generates cooling air, which flows from the second receiving cavity 1901 through the air duct to the first receiving cavity 1304 and finally exits from the first receiving cavity 1304. This allows the cooling air to pass through multiple components, improving the heat dissipation effect and efficiency. It should be noted that the air duct can be a virtual structure such as holes formed in the main housing 160 and the chassis 130, or a solid structure such as a pipe. In this embodiment, the chassis 130 and the maintenance compartment 190 form an air duct.

[0104] Specifically, at least a portion of the main housing 160 located between the battery pack compartment 180 and the second receiving cavity 1901 has an air inlet, through which cooling air flows into the second receiving cavity 1901. Optionally, there are multiple air inlets arranged in a grid pattern to increase the air intake and thus improve the heat dissipation effect. At least a portion of the chassis 130 has an air outlet, through which cooling air flows out of the first receiving cavity 1304.

[0105] In some specific embodiments, the electronic component 400 includes a motor control board 410 electrically connected to the cutting motor 122 and a power control board 420 electrically connected to the power supply device, with cooling air passing sequentially through the motor control board 410 and the power control board 420. This allows for simultaneous cooling of the motor control board 410 and the power control board 420, resulting in higher cooling efficiency and better cooling effect.

[0106] Specifically, a partition is formed or connected in the second receiving cavity 1901, which divides the second receiving cavity 1901 into a first chamber and a second chamber that are interconnected. Along the pushing direction c of the rear-walking machine, the first chamber is located in front of the second chamber. The cooling air flows out after passing through the first chamber, the second chamber, the air duct and the first receiving cavity 1304 in sequence. The motor control board 410 and the power control board 420 are located in the first chamber and the second chamber, respectively.

[0107] Furthermore, in some embodiments, the distance e between the motor control board 410 and the output axis a is less than 260mm. An excessively large distance e would result in an overly long airflow path, which would not only affect heat dissipation but also make it difficult to machine the airflow path on the chassis 130. Furthermore, in some embodiments, the distance f between the power control board 420 and the output axis a is less than 350mm. An excessively large distance f would result in an overly long airflow path, which would not only affect heat dissipation but also make it difficult to machine the airflow path on the chassis 130. Of course, in other embodiments, the distance e between the motor control board 410 and the output axis a, and the distance f between the power control board 420 and the output axis a, can be set to other values ​​as needed.

[0108] Furthermore, at least a portion of the chassis 130 is made of metal, and the electronic component 400 is provided with a heat dissipation section. At least a portion of the heat dissipation section is in contact with the metal component of the chassis 130. The cooling air generated by the rotation of the fan 1221 flows from the second receiving cavity 1901 through the air duct to the first receiving cavity 1304, and then flows out from the first receiving cavity 1304. Due to the high heat transfer efficiency of metal, by making at least a portion of the chassis 130 of metal material and having the portion of metal material in direct contact with the heat dissipation section of the electronic component 400, the heat dissipation efficiency and effect can be further improved.

[0109] It should be noted that, in some embodiments, the cutting motor 122, battery pack 110, and electronic components 400 can be integrated into a single housing to form a power head, while a large power head cavity is formed within the main housing 160 to accommodate the power head, which can be inserted into the power head cavity in an installation direction. This installation direction can be parallel to the central axis.

[0110] As shown in Figures 1, 12, and 13, along the front-to-back direction of the rear-walking machine, the walking assembly 150 specifically includes front walking wheels 151 and rear walking wheels 152. There are two front walking wheels 151, located at the front end of the chassis 130 and connected by a front axle. The front axle has a U-shaped structure, with its middle portion rotatably connected to the chassis 130. There are two rear walking wheels 152, both located at the rear end of the chassis 130 and rotatably connected by a rear axle. The rotation axes of the two front walking wheels 151 with respect to the front axle do not coincide with the rotation axis of the front axle relative to the chassis 130, and the rotation axes of the two rear walking wheels 152 with respect to the rear axle do not coincide with the rotation axis of the rear axle relative to the chassis 130.

[0111] In some embodiments, the distance L2 between the central axis of the front wheel 151 and the central axis of the rear wheel 152 is greater than or equal to 600 mm and less than or equal to 1100 mm. In one embodiment, the distance L2 between the central axis of the front wheel 151 and the central axis of the rear wheel 152 is 600 mm, 650 mm, 700 mm, 750 mm, 800 mm, 850 mm, 900 mm, 950 mm, 1000 mm, 1050 mm, or 1100 mm. Of course, in addition to these values, the distance L2 between the central axis of the front wheel 151 and the central axis of the rear wheel 152 can also be other values ​​within the range of 600 mm to 1100 mm.

[0112] Along the forward and backward direction of the rear-walking machine, the walking assembly 150 includes a left walking wheel 1501 and a right walking wheel 1502. The distance W between the outer edges of the left walking wheel 1501 and the right walking wheel 1502 is less than the length L1 of the cutting blade 121. This arrangement enables edge mowing, which is beneficial for improving the mowing effect. It should be noted that the front walking wheel 151, rear walking wheel 152, left walking wheel 1501, and right walking wheel 1502 are defined according to their positions. Therefore, one of the two front walking wheels 151 is the left walking wheel 1501 and the other is the right walking wheel 1502, and one of the two rear walking wheels 152 is also the left walking wheel 1501 and the other is the right walking wheel 1502.

[0113] The adjustment mechanism 170 includes a connecting mechanism 1703. In this embodiment, the connecting mechanism 1703 is specifically a connecting rod, with its two ends connected to the front wheel axle and the rear wheel axle, respectively. The rear wheel 152 also includes a rear wheel drive motor and a rear wheel output shaft 140. The rear wheel drive motor is connected to the rear wheel axle through the rear wheel output shaft 140 and is used to drive the rear wheel axle to rotate.

[0114] The adjustment mechanism 170 also includes an operating element for adjusting the mowing height and a stop plate for controlling the mowing height. Specifically, the stop plate has stop grooves through which the operating element passes from one side of the stop plate into the other side; that is, the operating element partially extends into the stop groove. The stop groove includes multiple inwardly recessed stop recesses and connecting grooves. The stop recesses can accommodate the operating element, and the sidewalls of the stop recesses can limit the movement of the operating element. The operating element is located in different stop recesses, limiting the walk-behind machine to different mowing heights. The connecting grooves allow the multiple stop recesses to be connected, and the operating element changes position between the multiple stop recesses via the connecting grooves. When the user needs to adjust the mowing height, the operating element is moved from one stop recess along the direction of the stop recess into the connecting groove, then slid along the connecting groove to approach another stop recess, and then moved into that stop recess along the direction of the other stop recess. The stop plate has an arc-shaped plate structure, and optionally, a stop indicator is provided on the stop plate. The operating component is connected to the connecting mechanism 1703 and is used to drive the connecting mechanism 1703 to rotate, thereby driving the front wheel axle and the rear wheel axle to rotate, so as to adjust the mowing height.

[0115] In some embodiments, the gear shift plate includes a first gear shift plate 1701 and a second gear shift plate 1702, and the operating components include a first operating component 1704 and a second operating component 1705. The first operating component 1704 cooperates with the first gear shift plate 1701 to adjust the height of the rear of the chassis 130, and the second gear shift plate 1702 and the second operating component 1705 cooperate to adjust the height of the front of the chassis 130. The chassis 130 includes a first mounting portion 1301, a second mounting portion 1302, and a third mounting portion 1306. The first mounting portion 1301 is used to mount the first gear shift plate 1701, the second mounting portion 1302 is used to selectively mount the second gear shift plate 1702, and the third mounting portion 1306 is used to selectively mount the connecting mechanism 1703 for connecting the front drive wheel 151 and the rear drive wheel 152.

[0116] In a more specific embodiment, the chassis 130 includes a first usage mode and a second usage mode. As shown in FIG12, in the first usage mode, the adjustment mechanism 170 adjusts the overall height of the chassis 130 through a first gear plate 1701, a first operating member 1704 cooperating with the first gear plate 1701, and a connecting mechanism 1703 to adjust the mowing height. As shown in FIG13, in the second usage mode, the adjustment mechanism 170 adjusts the height of the rear side of the chassis 130 through the first gear plate 1701 and the first operating member 1704 cooperating with the first gear plate 1701, and adjusts the height of the front side of the chassis 130 through a second gear plate 1702 and a second operating member 1705 cooperating with the second gear plate 1702 to adjust the mowing height.

[0117] The chassis 130 of the rear-walking machine is provided with a first mounting part 1301 for mounting a first gear plate 1701, a second mounting part 1302 for selectively mounting a second gear plate 1702, and a third mounting part 1306 for selectively mounting a connecting mechanism 1703 for connecting the front wheel 151 and the rear wheel 152. This allows the chassis 130 to be adapted to a variety of rear-walking machines used in different scenarios, making it highly versatile, widely applicable, well-platformized, and low-cost.

[0118] As shown in Figures 1, 14, and 15, the rear-walking machine also includes an operating mechanism 200, specifically a handle mechanism. In some embodiments, the operating mechanism 200 includes at least one of a first handle mechanism 210 and a second handle mechanism 220, at least one of which is rotatable about a first rotation axis. The chassis 130 can selectively mount either the first handle mechanism 210 or the second handle mechanism 220. This allows for platformization of the chassis 130, enabling it to accommodate the installation of multiple handle mechanisms and improving the operational flexibility of the rear-walking machine.

[0119] It should be noted that the first handle mechanism 210 or the second handle mechanism 220 here refers to two handle mechanisms with different structures. There is no limitation on the specific structure. The handle mechanisms on existing rear-walking work machines can be used in this embodiment.

[0120] In some embodiments, the first handle mechanism 210 and the second handle mechanism 220 are mounted at the same position on the chassis 130, and the mounting position on the chassis 130 for mounting the handle mechanism is the handle mounting part 1303. This improves the efficiency of handle mechanism replacement and avoids misalignment during replacement. Optionally, a handle connector 203 is provided at the mounting position where the handle mounting part 1303 is located, and the connecting rod 202 of the first handle mechanism 210 or the connecting rod 202 of the second handle mechanism 220 can be rotatably connected to the handle connector 203. Optionally, the handle connector 203 is a plate made of iron or other materials, and the connecting end of the handle mechanism is rotatably connected to the handle connector 203 via a pivot.

[0121] As shown in Figures 14 and 15, both the first handle mechanism 210 and the second handle mechanism 220 include a handle portion 201 for a user to grip and a connecting rod 202 for connecting the handle portion 201 and the main unit 100. The handle portion 201 extends along a first direction, and the connecting rod 202 extends along a second direction. Optionally, the first direction is perpendicular to the second direction to improve the aesthetics and ease of assembly of the handle mechanism.

[0122] In some more specific embodiments, at least one of the first handle mechanism 210 and the second handle mechanism 220 includes a connecting rod 202 that is telescopically extendable in a second direction. In this embodiment, as shown in FIG12, the first handle mechanism 210, which is telescopically extendable in the second direction, includes a sleeved first rod 2021 and a second rod 2022, which are telescopically connected and can change length through extension and retraction. Exemplarily, the handle mechanism includes a household handle and a professional handle. The household handle is designed to be telescopic for easy storage to reduce space occupied when not in use, while the professional handle is designed to be non-telescopic to ensure service life.

[0123] Referring again to Figure 1, the grass collection bag 300 is used to collect the grass clippings cut by the cutting element. As the amount of grass clippings collected increases, the weight inside the grass collection bag 300 increases. Since the grass collection bag 300 is located at the rear of the main unit 100, as the amount of grass clippings collected by the grass collection bag 300 increases, the center of gravity of the entire rear-walking machine will shift rearward, making it prone to tipping over. To avoid tipping over, in some specific embodiments, the weight of the chassis 130 accounts for at least 15% of the weight of the main unit 100.

[0124] This rear-walking machine has a heavier chassis 130 by setting the weight of the chassis 130 to be at least 15% of the weight of the main unit 100. This results in a more forward center of gravity for the rear-walking machine, making it less prone to tipping over in all operating modes, thus improving the user experience and safety.

[0125] Optionally, the chassis 130 is a disc-shaped structure made of at least one of aluminum and plastic. Of course, in addition to aluminum and plastic, the chassis 130 can also be made of other materials with higher density to make the chassis 130 have a greater weight for the same volume, thereby increasing the weight of the chassis 130 as a proportion of the total weight of the rear-walking machine, and thus allowing the center of gravity of the rear-walking machine to be positioned as far forward as possible, avoiding the phenomenon of tipping over when the grass collection bag 300 is full of grass clippings.

[0126] Simultaneously, due to the increased weight of the chassis 130, its strength will also increase accordingly. In the prior art, when the cutting blade 121 cuts vegetation, the cutting speed of the cutting blade 121 is limited due to the insufficient strength of the chassis 130. In the embodiments of this application, due to the increased strength of the chassis 130, the linear velocity M of the cutting blade 121 tip is greater than or equal to 2900 m / min and less than or equal to 5791 m / min.

[0127] In some embodiments, the rear wheel output axle 140 is rotatably configured about a second rotation axis, and the distance g between the center of gravity of the chassis 130 and the rear wheel output axle 140 is greater than 112 mm. In some embodiments, the front wheel axle is rotatably configured about a third rotation axis, and the distance h between the center of gravity of the chassis 130 and the front wheel axle is greater than 112 mm. In some more specific embodiments, 0.8 ≤ g / h ≤ 1.2, for example, this ratio can be 0.9, 1, or 1.1, thus ensuring that the center of gravity of the chassis 130 is located in the central region between the front wheel axle and the rear wheel output axle 140, avoiding the occurrence of rollover.

[0128] In some embodiments, the chassis 130 is a component of non-uniform thickness, and the weight of the chassis 130 is greater than or equal to 8 kg and less than or equal to 11 kg. For example, the weight of the chassis 130 can be 8 kg, 9 kg, 10 kg, or 11 kg. In some embodiments, a cavity is formed within the chassis 130, and the weight of the material required to make the cavity accounts for 60% of the weight of the same material required to make the chassis 130. It is understood that the cavity is a part of the blade receiving portion 1305 near the cutting blade 121. The blade receiving portion 1305 includes the cavity and the grass discharge channel. The cavity accommodates the cutting blade 121. Specifically, when the cutting blade 121 cuts vegetation, the rotation of the cutting blade 121 creates an airflow within the cavity. The cut vegetation is guided by the airflow within the cavity and flows from the cavity to the grass discharge channel and then into the grass collection bag 300. It is understood that the rotation of the cutting blade 121 forms a cutting radius, and the inner wall of the cavity has a circular outline with a radius slightly larger than the cutting radius.

[0129] In some embodiments, the main unit 100 also includes a blue grass frame (not shown), which is installed at the rear of the main unit housing 160. The grass collection bag 300 is detachably connected to the blue grass frame. When the grass collection bag 300 is full of grass clippings, the distance between the center of gravity of the backward-walking machine and the foremost part of the backward-walking machine is at most 50% of the total length of the backward-walking machine. This ensures that the center of gravity of the backward-walking machine is located in the front half of the machine, thereby completely preventing the backward-walking machine from tipping over.

[0130] The foregoing has shown and described the basic principles, main features, and advantages of this application. Those skilled in the art should understand that the above embodiments do not limit this application in any way, and all technical solutions obtained by equivalent substitution or equivalent transformation fall within the protection scope of this application.

Claims

1. A rear-moving working machine, comprising: Host (100), the host (100) includes: Battery pack (110); The cutting assembly (120) includes a cutting blade (121) for cutting vegetation and a cutting motor (122). A chassis (130) housing at least part of the cutting assembly (120), with an output shaft (140) mounted on the chassis (130) to drive the cutting blade (121). The characteristic feature is that the maximum diameter D of the output axis of the inner wall of the chassis (130) passing through the output shaft (140) is greater than 22 inches and less than or equal to 30 inches.

2. The rear-walking working machine according to claim 1, characterized in that, The maximum diameter D of the inner wall of the chassis (130) through the output axis of the output shaft (140) is set to 26 inches.

3. The rear-walking working machine according to claim 1, characterized in that, The distance L from the tip of the cutting blade (121) to the inner wall of the chassis (130) is greater than or equal to 5 mm and less than or equal to 30 mm.

4. The rear-walking working machine according to claim 1, characterized in that, The linear velocity of the cutting blade (121) is greater than or equal to 50 m / s and less than or equal to 100 m / s.

5. The rear-walking working machine according to claim 1, characterized in that, The maximum output power of the cutting motor (122) is greater than or equal to 3000W.

6. The rear-walking working machine according to claim 1, characterized in that, When the cutting motor (122) has the maximum cutting efficiency, the power of the cutting motor (122) is greater than or equal to 1400W.

7. The rear-walking working machine according to claim 1, characterized in that, The cutting motor (122) has a rotational speed greater than or equal to 1400 rad / s and less than or equal to 3600 rad / s.

8. The rear-walking working machine according to claim 1, characterized in that, The rated voltage of the battery pack (110) is greater than or equal to 36V.

9. The rear-walking working machine according to claim 1, characterized in that, The sweeping area S of the cutting blade (121) rotating one revolution is greater than or equal to 0.25㎡ and less than or equal to 0.46㎡.

10. The rear-walking working machine according to claim 9, characterized in that, The sweep area S of the cutting blade (121) is 0.34㎡ per revolution.

11. The rear-walking working machine according to claim 1, characterized in that, The ratio of the motor diameter D1 of the cutting motor (122) to the length L1 of the cutting blade (121) is greater than or equal to 0.1 and less than or equal to 0.

6.

12. The rear-walking working machine according to claim 1, characterized in that, The distance L2 between the central axis of the front wheel (151) and the central axis of the rear wheel (152) is greater than or equal to 600 mm and less than or equal to 1100 mm.

13. The rear-walking working machine according to claim 1, characterized in that, The walking assembly (150) includes a left walking wheel (1501) and a right walking wheel (1502), and the distance W between the outer side of the left walking wheel (1501) and the outer side of the right walking wheel (1502) is less than the length L1 of the cutting blade (121).

14. The rear-walking working machine according to claim 1, characterized in that, The weight of the cutting blade (121) is greater than or equal to 600g.

15. The rear-walking working machine according to claim 1, characterized in that, The weight of the cutting motor (122) is greater than or equal to 2 kg.

16. A rear-moving working machine, comprising: Host (100), the host (100) includes: Battery pack (110); The cutting assembly (120) includes a cutting blade (121) for cutting vegetation. A chassis (130) housing at least part of the cutting assembly (120), with an output shaft (140) mounted on the chassis (130) to drive the cutting blade (121). The feature is that the sweeping area S of the cutting blade (121) in one revolution is greater than or equal to 0.25㎡ and less than or equal to 0.46㎡.

17. A rear-moving working machine, comprising: Host (100), the host (100) includes: The walking assembly (150) includes a front walking wheel (151) and a rear walking wheel (152). The cutting assembly (120) includes a cutting blade (121) for cutting vegetation and a cutting motor (122). A chassis (130) housing at least a portion of the cutting assembly (120), an output shaft (140) mounted on the chassis (130), and a cutting motor (122) configured to drive the cutting blade (121) by driving the output shaft (140). Its features are, The ratio of the motor diameter D1 of the cutting motor (122) to the length L1 of the cutting blade (121) is greater than or equal to 0.1 and less than or equal to 0.

6. The distance L2 between the central axis of the front wheel (151) and the central axis of the rear wheel (152) is greater than or equal to 600 mm and less than or equal to 1100 mm.

18. The rear-walking working machine according to claim 17, characterized in that, The walking assembly (150) includes a left walking wheel (1501) and a right walking wheel (1502), and the distance W between the outer side of the left walking wheel (1501) and the outer side of the right walking wheel (1502) is less than the length L1 of the cutting blade (121).

19. The rear-walking working machine according to claim 17, characterized in that, The distance L from the tip of the cutting blade (121) to the inner wall of the chassis (130) is greater than or equal to 5 mm and less than or equal to 30 mm.

20. The rear-walking working machine according to claim 17, characterized in that, The linear velocity of the cutting blade (121) is greater than or equal to 50 m / s and less than or equal to 100 m / s.

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