Manned lawn mower, and outdoor traveling apparatus

Abstract

A manned lawn mower (100) and an outdoor traveling apparatus. The manned lawn mower (100) comprises: a frame (11); a traveling wheel group (41) mounted on the frame (11), the traveling wheel group (41) comprising at least rear traveling wheels, which comprise a first traveling wheel (411) and a second traveling wheel (412); a traveling motor (42) provided with a driving shaft and configured to drive the traveling wheel group (41); a mowing element driven by a mowing motor; and a power supply assembly (20), which comprises at least one battery pack and is configured to supply power to the traveling motor (42) and / or the mowing motor, wherein the ratio of the distance L1 between the first traveling wheel (411) and the second traveling wheel (412) to the radius R of the first traveling wheel (411) is greater than or equal to 6.

Description

Manned lawn mowers and outdoor walking equipment

[0001] This application claims priority to the Chinese patent application filed with the China Patent Office on December 26, 2023 with application number 202311817442.0, and the Chinese patent application filed with the China Patent Office on November 29, 2024 with application number 202411745368.0. The entire contents of the above applications are incorporated by reference into this application. Technical Field

[0002] The present application relates to an electric device, for example, a manned lawn mower and an outdoor walking device. Background Art

[0003] Outdoor walking equipment in related technologies is used for outdoor work. Examples include manned snowplows, manned lawn mowers, and all-terrain vehicles. Manned lawn mowers can suffer from high phase currents when turning on flat ground and limited ability to handle extreme slopes.

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

[0005] One object of the present application is to resolve or at least alleviate some or all of the above-mentioned problems. To this end, one object of the present application is to provide a manned lawn mower and outdoor walking equipment. This manned lawn mower has lower motor torque requirements during cornering and slope operations, exhibits slower temperature rise, and offers greater endurance.

[0006] In order to achieve the above objectives, the present application adopts the following technical solutions: a manned lawn mower, comprising: a frame; a walking wheel group, mounted to the frame; the walking wheel group includes at least a rear walking wheel, and the rear walking wheel includes a first walking wheel and a second walking wheel; a walking motor, having a drive shaft, configured to drive the walking wheel group; a mowing element; driven by a mowing motor; a power supply assembly, comprising at least one battery pack, configured to power the walking motor and / or the mowing motor; the ratio of the distance L1 between the first walking wheel and the second walking wheel to the radius R of the first walking wheel is ≥6.

[0007] In some embodiments, the distance L1 between the first running wheel and the second running wheel is ≥1200 mm.

[0008] In some embodiments, the distance L1 between the first running wheel and the second running wheel is ≥1250 mm.

[0009] In some embodiments, the radius R of the first traveling wheel is ≤ 200 mm.

[0010] In some embodiments, the radius R of the first running wheel and the second running wheel is ≤ 180 mm.

[0011] In some embodiments, the total energy of the power supply assembly is greater than or equal to 2 kW·h and less than or equal to 10 kW·h.

[0012] In some embodiments, a distance L2 from a midpoint of a line connecting the axis of the first running wheel and the axis of the second running wheel to the center of gravity of the manned lawn mower is ≤200 mm.

[0013] In some embodiments, when traveling on a slope with a slope of 10°≤slope≤20°, the maximum torque required for the first running wheel and / or the second running wheel to travel is ≤70 N·m.

[0014] In some embodiments, at least one battery pack is removably mounted on the vehicle frame.

[0015] In some embodiments, the travel motor includes at least a first travel motor and a second travel motor, the first travel motor is configured to drive the first travel wheel, and the second travel motor is configured to drive the second travel wheel.

[0016] In some embodiments, the manned lawn mower is a riding lawn mower or a stand-on lawn mower.

[0017] In some embodiments, the energy of at least one battery pack of the power supply assembly is greater than or equal to 100 W·h and less than or equal to 2 kW·h.

[0018] The present application also discloses a technical solution: a manned lawn mower, comprising a frame; a walking wheel group, mounted to the frame; the walking wheel group includes at least a rear walking wheel, and the rear walking wheel includes a first walking wheel and a second walking wheel; a walking motor, having a drive shaft, configured to drive the walking wheel group; a mowing element, driven by the mowing motor; a power supply assembly, comprising at least one battery pack, configured to power the walking motor and / or the mowing motor; the distance L1 between the first walking wheel and the second walking wheel is ≥1200mm.

[0019] In some embodiments, the distance L1 between the first running wheel and the second running wheel is ≥1250 mm.

[0020] In some embodiments, the radius R of the first running wheel and the second running wheel is ≤ 200 mm.

[0021] The present application also discloses a technical solution: an outdoor walking device, comprising: a frame; a walking wheel group, mounted to the frame; the walking wheel group includes at least a rear walking wheel, and the rear walking wheel includes a first walking wheel and a second walking wheel; a walking motor, having a drive shaft, configured to drive the walking wheel group; a mowing element, driven by a mowing motor; a power supply assembly, comprising at least one battery pack, configured to power the walking motor and / or the mowing motor; the ratio of the distance L1 between the first walking wheel and the second walking wheel to the radius R of the first walking wheel is ≥6.

[0022] In some embodiments, the outdoor walking device is a manned snowplow, a manned lawn mower, or an all-terrain vehicle. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] FIG1 is a schematic structural diagram of a manned lawn mower according to an embodiment of the present application;

[0024] FIG2 is a structural schematic diagram of the manned lawn mower in FIG1 from another perspective;

[0025] FIG3 is a top view of the manned lawn mower in FIG1 ;

[0026] FIG4 is a schematic plan view of a manned lawn mower according to an embodiment of the present application;

[0027] FIG5 is a diagram showing the correlation between the wheel radius and the maximum torque required to drive the first running wheel under the first working condition;

[0028] FIG6 is a diagram showing the correlation between the wheel radius and the maximum torque required to drive the second running wheel under the first working condition;

[0029] FIG7 is a diagram showing the correlation between the wheel span and the maximum torque required to drive the first running wheel under the first working condition;

[0030] FIG8 is a diagram showing the relationship between the wheel span and the maximum torque required to drive the second running wheel under the first working condition;

[0031] FIG9 is a diagram showing the correlation between the eccentric distance and the maximum torque required to drive the first running wheel under the first working condition;

[0032] FIG10 is a diagram showing the correlation between the eccentric distance and the maximum torque required to drive the second traveling wheel under the first working condition;

[0033] FIG11 is a diagram showing the correlation between the vehicle weight and the maximum torque required to drive the first running wheel under the first working condition;

[0034] FIG12 is a diagram showing the correlation between the vehicle weight and the maximum torque required to drive the second road wheel under the first working condition;

[0035] FIG13 is a diagram showing the sensitivity of the maximum torque required to drive the first travel wheel to the wheel radius, wheel span, eccentricity and vehicle weight under the first working condition;

[0036] FIG14 is a diagram showing the sensitivity of the maximum torque required to drive the second traveling wheel to the wheel radius, wheel span, eccentric distance, and vehicle weight under the first working condition;

[0037] FIG15 is a diagram showing the relationship between the wheel radius and the maximum torque required to drive the first running wheel under the second working condition;

[0038] FIG16 is a diagram showing the relationship between the wheel radius and the maximum torque required to drive the second running wheel under the second working condition;

[0039] FIG17 is a diagram showing the relationship between the wheel span and the maximum torque required to drive the first running wheel under the second working condition;

[0040] FIG18 is a diagram showing the relationship between the wheel span and the maximum torque required to drive the second running wheel under the second working condition;

[0041] FIG19 is a diagram showing the correlation between the eccentric distance and the maximum torque required to drive the first traveling wheel under the second working condition;

[0042] FIG20 is a diagram showing the correlation between the eccentric distance and the maximum torque required to drive the second traveling wheel under the second working condition;

[0043] FIG21 is a diagram showing the correlation between the vehicle weight and the maximum torque required to drive the first running wheel under the second working condition;

[0044] FIG22 is a diagram showing the correlation between the vehicle weight and the maximum torque required to drive the second road wheel under the second working condition;

[0045] FIG23 is a diagram showing the sensitivity of the maximum torque required to drive the first travel wheel to the wheel radius, wheel span, eccentricity, and vehicle weight under the second working condition;

[0046] FIG24 is a diagram showing the sensitivity of the maximum torque required to drive the second traveling wheel to the wheel radius, wheel span, eccentric distance and vehicle weight under the second working condition. DETAILED DESCRIPTION

[0047] Before any embodiments of the present application are explained in detail, it is to be understood that the application is not limited in its application to the details of construction and the arrangement of components set forth in the following description or illustrated in the foregoing drawings.

[0048] In this application, the terms "comprises," "includes," "has," or any other variations thereof are intended to encompass non-exclusive inclusion, such that a process, method, article, or apparatus that includes a list of elements includes not only those elements but also other elements not explicitly listed, or elements inherent to such process, method, article, or apparatus. In the absence of further limitations, an element defined by the phrase "comprising a ..." does not preclude the presence of additional identical elements in the process, method, article, or apparatus that includes the element.

[0049] In this application, the term "and / or" describes a relationship between related objects, indicating that three possible relationships exist. For example, "A and / or B" can represent: A exists alone, A and B exist simultaneously, or B exists alone. Additionally, the character " / " in this application generally indicates that the related objects are in an "and / or" relationship.

[0050] In this application, the terms "connect," "combine," "couple," and "install" may 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 an intermediary, and an indirect connection refers to two parts or components being connected to at least one intermediary, with the two parts or components being connected via the intermediary. Furthermore, "connect" and "couple" are not limited to physical or mechanical connections or couplings and may include electrical connections or couplings.

[0051] In this application, it will be understood by those skilled in the art that relative terms (e.g., "about," "approximately," "substantially," etc.) used in conjunction with quantities or conditions include the values ​​and have the meaning indicated by the context. For example, the relative terms include at least the degree of error associated with the measurement of a specific value, the tolerance caused by manufacturing, assembly, use, etc. associated with a specific value. Such terms should also be considered to disclose a range defined by the absolute values ​​of the two endpoints. Relative terms may refer to plus or minus 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. In addition, "substantially" may refer to plus or minus a certain degree (e.g., 1 degree, 5 degrees, 10 degrees or more) on the basis of the indicated angle when expressing a relative angular position relationship (e.g., substantially parallel, substantially perpendicular).

[0052] In this application, it will be understood by those skilled in the art that the function performed by an assembly can be performed by one assembly, multiple assemblies, one part, or multiple parts. Similarly, the function performed by a part can also be performed by one part, one assembly, or a combination of multiple parts.

[0053] In the present application, the terms "upper", "lower", "left", "right", "front", "back" and other directional words are described based on the orientation and positional relationship shown in the accompanying drawings, and should not be understood as limiting the embodiments of the present application. In addition, in the context, it is also necessary to understand that when it is mentioned that an element is connected to another element "upper" or "lower", it can not only be directly connected to the other element "upper" or "lower", but also be indirectly connected to the other element "upper" or "lower" through an intermediate element. It should also be understood that directional words such as upper side, lower side, left side, right side, front side, back side, etc. not only represent the positive orientation, but can also be understood as the lateral orientation. For example, below can include directly below, lower left, lower right, lower front and lower back, etc.

[0054] In this application, the terms "controller," "processor," "central processing unit," "CPU," and "MCU" are used interchangeably. Where a unit "controller," "processor," "central processing unit," "CPU," or "MCU" is used to perform a particular function, unless otherwise specified, the function may be performed by a single unit or multiple units.

[0055] In this application, the terms "device", "module" or "unit" can be implemented in the form of hardware or software to achieve specific functions.

[0056] In this application, the terms "calculate", "judge", "control", "determine", "identify", etc. refer to the operations and processes of a computer system or similar electronic computing device (e.g., controller, processor, etc.).

[0057] As shown in FIG1 , the outdoor walking device 100 disclosed in this application can specifically be an electric wheeled device, such as a manned lawn mower, which a user can ride or stand on to operate to mow lawns and other vegetation. In this specification, the directions of front, back, left, right, up, and down are described as those shown in FIG1 . Specifically, when a user is riding on the outdoor walking device 100 located on the ground, the direction facing the user is defined as front, the direction facing away is defined as back, the left-hand side is defined as left, the right-hand side is defined as right, the direction close to the ground is defined as down, and the direction away from the ground is defined as up. Of course, the outdoor walking device disclosed in this application also includes all-terrain vehicles (UTVs). In related art, all-terrain vehicles include four-wheeled all-terrain vehicles (ATVs), multi-purpose all-terrain vehicles, and recreational vehicles. Furthermore, the outdoor walking device disclosed in this application also includes manned snowplows, push lawn mowers, push snowplows, all-terrain vehicles, and electric motorcycles.

[0058] As shown in Figures 1 to 3, the outdoor walking device 100 includes a housing assembly 10, a power supply assembly 20, and a walking assembly 40. The walking assembly 40 includes a walking wheel assembly 41 and a walking motor 42. The walking motor 42 has a drive shaft configured to rotate the walking wheel assembly 41. The power supply assembly 20 is configured to supply power to the outdoor walking device 100. Specifically, the power supply assembly 20 supplies power to the walking motor 42.

[0059] The power supply assembly 20 includes a battery pack and a connector for installing the battery pack to connect the battery pack to the outdoor walking device 100. The battery pack is detachably connected to the connector, and the connector is detachably installed to the outdoor walking device 100 so that it can be taken out to adapt to other electrical equipment. Among them, other electrical equipment includes but is not limited to all-terrain vehicles, hand-push lawn mowers, hand-push snow blowers, and manned lawn mowers. Specifically, the power supply assembly 20 of the outdoor walking device 100 can be removed from the outdoor walking device 100 in a detachable and washable manner, and then installed on the all-terrain vehicle, hand-push lawn mower, hand-push snow blower, riding lawn mower, and stand-up lawn mower to power the above-mentioned electrical equipment to realize the functions of the above-mentioned power supply equipment.

[0060] In some embodiments, the battery pack disclosed herein may include a lithium iron phosphate cell. In some embodiments, the battery pack may also be a supercapacitor, also known as an electrochemical capacitor.

[0061] Continuing with Figures 1 to 3 , the outdoor walking device, specifically a manned lawn mower 100, comprises a housing assembly 10, a power supply assembly 20, a mowing assembly 30, a travel assembly 40, an operating assembly 50, a frame 11, and a support unit. The frame 11 extends generally in the front-to-back direction and, together with the housing assembly 10, forms the main unit of the manned lawn mower 100. It is used to mount the power supply assembly 20, the mowing assembly 30, the travel assembly 40, and the support unit. The travel assembly 40 is configured to support the main unit. The operating assembly 50 includes an operating lever assembly 51, which is operated by a user to control the manned lawn mower's forward, reverse, and turning motions. In some embodiments, the operating assembly 50 may also include a steering wheel assembly. The support unit is mounted on the frame 11 and configured to support the operator. Optionally, the support unit includes a seat 91. The seat 91 is mounted to the frame 11 and configured to accommodate a user. Optionally, the support unit also includes a platform for the user to stand. The power supply assembly 20 is used to provide energy to the mowing assembly 30 and the travel assembly 40, thereby enabling the manned lawn mower 100 to be used as a power tool capable of carrying a person. Compared to fuel-powered manned lawn mowers, electric manned lawn mowers are more environmentally friendly and energy-efficient. In some embodiments, the manned lawn mower 100 further includes a grass collection device configured to collect grass clippings cut by the mowing assembly 30. The grass collection device includes a grass collection basket assembly, which is removably mounted behind the seat 91.

[0062] In some embodiments, the travel assembly 40 includes a travel wheel assembly 41 and a travel motor 42. The travel motor 42 has a drive shaft configured to drive the travel wheel assembly 41 to rotate. The travel wheel assembly 41 is connected to the main machine to support the main machine. The travel wheel assembly 41 can at least drive the manned lawn mower 100 to travel in the front-to-back direction. Optionally, the travel wheel assembly 41 includes rear travel wheels, which include a first travel wheel 411 and a second travel wheel 412. In this embodiment, the first travel wheel 411 is the left rear wheel, and the second travel wheel 412 is the right rear wheel. In other embodiments, the first travel wheel 411 is the right rear wheel, and the second travel wheel 412 is the left rear wheel, which is not specifically limited here. Optionally, the travel wheel assembly 41 also includes a third travel wheel 413 and a fourth travel wheel 414, where both the third travel wheel 413 and the fourth travel wheel 414 are front wheels. In this embodiment, the third travel wheel 413 is the left front wheel, and the fourth travel wheel 414 is the right front wheel. In other embodiments, the third running wheel 413 is the left rear wheel, and the fourth running wheel 414 is the right rear wheel, which is not specifically limited here.

[0063] The travel motor 42 drives the travel wheel assembly 41 to rotate, enabling the manned lawn mower 100 to travel. Optionally, the number of travel motors 42 can be one, two, three, or four. In this embodiment, there are two travel motors 42, each driving the first travel wheel 411 or the second travel wheel 412, respectively, thereby enabling the manned lawn mower 100 to turn in directions other than the front-to-back direction.

[0064] The power supply assembly 20 is configured to at least supply power to the travel motor 42. The power supply assembly 20 includes at least one battery pack. In some embodiments, the number of battery packs included in the power supply assembly 20 is 3, 4, 5, 6, 7, 8, or more. In some embodiments, at least one battery pack of the power supply assembly 20 is detachably mounted to the manned lawn mower 100. The energy of the at least one battery pack of the power supply assembly 20 is greater than or equal to 100W·h and less than or equal to 2kW·h. In some embodiments, the power supply assembly 20 includes at least one large-capacity battery pack, the energy of which is greater than or equal to 1kW·h and less than or equal to 30kW·h.

[0065] In this application, a manned lawn mower 100 is used as a specific embodiment. In fact, manned lawn mowers include but are not limited to stand-on lawn mowers and riding lawn mowers.

[0066] Manned lawn mowers, especially zero roll-over radius (ZTR) lawn mowers, can turn on the spot and are highly efficient. However, as they are off-road vehicles, they operate in complex environments and are often used in complex working environments such as slopes and depressions. During operation, they may encounter problems such as large phase current when turning on flat ground and poor extreme driving ability on slopes.

[0067] In the manned lawn mower disclosed in the present application, as shown in Figures 3 and 4 , the ratio of the distance L1 between the first and second running wheels 411, 412, to the radius R of the first running wheel 411 is ≥ 6. The distance L1 between the first and second running wheels 411, 412, refers to the distance between the axis of the first running wheel 411 and the axis of the second running wheel 412. The radius R of the first running wheel 411 refers to the radius of the first running wheel 411 including the tire.

[0068] Analysis revealed that both the distance L1 between the first and second travel wheels 411, 412 and the radius R of the first travel wheel 411 affect the maximum torque required by the travel motor 42 to drive the first and second travel wheels 411, 412. At the same target wheel speed, by setting the ratio of the distance L1 between the first and second travel wheels 411, 412 to the radius R of the first travel wheel 411 to be ≥6, the maximum torque required by the travel motor 42 to drive the first and second travel wheels 411, 412 is significantly lower than that of conventional manned lawn mowers. This reduction in torque can improve battery life, reduce temperature rise, and improve maximum operating capacity. Therefore, manned lawn mowers can adapt to operating conditions with higher slopes and have better operational capabilities in extreme conditions such as slippery slopes.

[0069] The following describes the specific process of discovering that the distance L1 between the first and second travel wheels 411, 412, and the radius R of the first travel wheel 411 both affect the maximum torque required by the travel motor 42 to drive the first and second travel wheels 411, 412. First, a dynamic model of the manned lawn mower was established, then calibrated. Finally, a linear relationship was obtained between the maximum torque required to drive the first and second travel wheels 411, 412 at the same target wheel speed and for different parameters under different operating conditions.

[0070] Exemplarily, the pedestrian lawn mower is in a left-turn condition in the first working condition. Specifically, the user uses the operating member to make the first travel wheel 411 rotate forward at half the maximum allowable speed, and the second travel wheel 412 rotates forward at the maximum allowable speed. FIG5 is a correlation diagram of the wheel radius and the maximum torque required to drive the first travel wheel 411 in the first working condition. FIG6 is a correlation diagram of the wheel radius and the maximum torque required to drive the second travel wheel 412 in the first working condition. The dotted lines in FIG5 and FIG6 represent the linear fitting relationship between the wheel radius and the maximum torque. Among them, the wheel radius in FIG5 and FIG6 is the radius R of the first travel wheel 411. It can be seen from FIG5 and FIG6 that in the first working condition, there is a linear correlation between the radius R and the maximum torque required to drive the first travel wheel 411 and the second travel wheel 412 to walk at the same target wheel speed.

[0071] FIG7 is a correlation diagram of the wheel span and the maximum torque required to drive the first running wheel 411 under the first working condition. FIG8 is a correlation diagram of the wheel span and the maximum torque required to drive the second running wheel 412 under the first working condition. The dotted lines in FIG7 and FIG8 represent the linear fitting relationship between the wheel span and the maximum torque. Among them, the wheel span in FIG7 and FIG8 is the distance L1 between the first running wheel 411 and the second running wheel 412. It can be seen from FIG7 and FIG8 that under the first working condition, there is a linear correlation between the distance L1 between the first running wheel 411 and the second running wheel 412 and the maximum torque required to drive the first running wheel 411 and the second running wheel 412 at the same target wheel speed.

[0072] Figure 9 is a correlation diagram between the eccentric distance and the maximum torque required to drive the first running wheel 411 under the first working condition. Figure 10 is a correlation diagram between the eccentric distance and the maximum torque required to drive the second running wheel 412 under the first working condition. The solid lines in Figures 9 and 10 represent the relationship between the eccentric distance and the maximum torque. The dotted lines in Figures 9 and 10 represent the linear fitting relationship between the eccentric distance and the maximum torque. The two lines in Figures 9 and 10 overlap, indicating that the eccentric distance and the maximum torque are completely linearly correlated. Among them, the eccentric distance in Figures 9 and 10 is the distance L2 from the midpoint d of the line connecting the axis of the first running wheel 411 and the axis of the second running wheel 412 to the center of gravity G of the manned lawn mower. As can be seen from Figures 9 and 10, under the first working condition, there is a linear correlation between the distance L2 from the midpoint d of the line connecting the axis of the first running wheel 411 and the axis of the second running wheel 412 to the center of gravity G of the manned lawn mower and the maximum torque required to drive the first running wheel 411 and the second running wheel 412 to move at the same target wheel speed.

[0073] Figure 11 is a correlation diagram between the vehicle weight and the maximum torque required to drive the first running wheel 411 under the first working condition, and Figure 12 is a correlation diagram between the vehicle weight and the maximum torque required to drive the second running wheel 412 under the first working condition. The solid lines in Figures 11 and 12 represent the relationship between the vehicle weight and the maximum torque, and the dotted lines in Figures 11 and 12 represent the linear fitting relationship between the vehicle weight and the maximum torque. The vehicle weight is the total weight of the manned lawn mower. The double lines in Figures 11 and 12 coincide, indicating that the vehicle weight and the maximum torque are completely linearly correlated. As can be seen from Figures 11 and 12, under the first working condition, there is a linear correlation between the vehicle weight and the maximum torque required to drive the first running wheel 411 and the second running wheel 412 at the same target wheel speed.

[0074] Figure 13 shows the sensitivity of the maximum torque required to drive the first travel wheel 411 to the wheel radius, wheel span, eccentricity, and vehicle weight under the first operating condition. Figure 14 shows the sensitivity of the maximum torque required to drive the second travel wheel 412 to the wheel radius, wheel span, eccentricity, and vehicle weight under the first operating condition. Sensitivity refers to the change in maximum torque caused by a one-unit change in the independent variables, including wheel radius, wheel span, eccentricity, and vehicle weight. As shown in Figures 13 and 14, the wheel radius, wheel span, eccentricity, and vehicle weight all affect the maximum torque. That is, under the first operating condition, L1, R, L2, and vehicle weight all affect the maximum torque required by the travel motor 42 to drive the first and second travel wheels 411, 412. L1 and R have a greater impact on the maximum torque required by the travel motor 42 to drive the first and second travel wheels 411, 412. L1 has the greatest impact on the maximum torque required by the travel motor 42 to drive the first and second travel wheels 411, 412.

[0075] Exemplarily, in the second working condition, the pedestrian lawn mower is in a left-turn working condition. The user uses the operating member to make the first travel wheel 411 rotate backward at the maximum allowable speed and the second travel wheel 412 rotate forward at the maximum allowable speed. Figure 15 is a correlation diagram between the wheel radius and the maximum torque required to drive the first travel wheel 411 in the second working condition. Figure 16 is a correlation diagram between the wheel radius and the maximum torque required to drive the second travel wheel 412 in the second working condition. The dotted lines in Figures 15 and 16 represent the linear fitting relationship between the wheel radius and the maximum torque. The wheel radius in Figures 15 and 16 is the radius R of the first travel wheel 411. As can be seen from Figures 15 and 16, in the second working condition, there is a linear correlation between the radius R and the maximum torque.

[0076] Figure 17 is a correlation diagram between the wheel span and the maximum torque required to drive the first running wheel 411 under the second working condition. Figure 18 is a correlation diagram between the wheel span and the maximum torque required to drive the second running wheel 412 under the second working condition. The dotted lines in Figures 17 and 18 represent the linear fitting relationship between the wheel span and the maximum torque. The wheel span in Figures 17 and 18 is the distance L1 between the first running wheel 411 and the second running wheel 412. As can be seen from Figures 17 and 18, under the second working condition, there is a linear correlation between the distance L1 between the first running wheel 411 and the second running wheel 412 and the maximum torque.

[0077] FIG19 is a correlation diagram of the eccentric distance and the maximum torque required to drive the first travel wheel 411 under the second working condition, and FIG20 is a correlation diagram of the eccentric distance and the maximum torque required to drive the second travel wheel 412 under the second working condition. The dotted lines in FIG19 and FIG20 represent the linear fitting relationship between the eccentric distance and the maximum torque, and the solid lines in FIG19 and FIG20 represent the relationship between the eccentric distance and the maximum torque. The two lines in FIG19 and FIG20 overlap, indicating that the eccentric distance and the maximum torque are completely linearly correlated. The eccentric distance in FIG19 and FIG20 is the distance L2 from the midpoint d of the line connecting the axis of the first travel wheel 411 and the axis of the second travel wheel 412 to the center of gravity G of the manned lawn mower. As can be seen from FIG19 and FIG20, under the second working condition, the distance L2 from the midpoint d of the line connecting the axis of the first travel wheel 411 and the axis of the second travel wheel 412 to the center of gravity G of the manned lawn mower has a linear correlation with the maximum torque.

[0078] Figure 21 is a correlation diagram between the vehicle weight and the maximum torque required to drive the first running wheel 411 under the second working condition, and Figure 22 is a correlation diagram between the vehicle weight and the maximum torque required to drive the second running wheel 412 under the second working condition. The dotted lines in Figures 21 and 22 represent the linear fitting relationship between the vehicle weight and the maximum torque, and the solid lines in Figures 21 and 22 represent the relationship between the vehicle weight and the maximum torque. The double lines in Figures 21 and 22 overlap, indicating that the vehicle weight and the maximum torque are completely linearly correlated. The vehicle weight is the total weight of the manned lawn mower. As can be seen from Figures 21 and 22, under the second working condition, there is a linear correlation between the vehicle weight and the maximum torque.

[0079] FIG23 shows the sensitivity of the maximum torque required to drive the first travel wheel 411 to the wheel radius, wheel span, eccentricity, and vehicle weight under the second operating condition. FIG24 shows the sensitivity of the maximum torque required to drive the second travel wheel 412 to the wheel radius, wheel span, eccentricity, and vehicle weight under the second operating condition. Sensitivity refers to the change in maximum torque caused by a one-unit change in the independent variable, which includes the wheel radius, wheel span, eccentricity, and vehicle weight. As shown in FIG23 and FIG24, the wheel radius, wheel span, eccentricity, and vehicle weight all affect the maximum torque. That is, under the second operating condition, L1, R, L2, and vehicle weight all affect the maximum torque required by the travel motor 42 to drive the first and second travel wheels 411, 412. L1 and R have a greater impact on the maximum torque required by the travel motor 42 to drive the first and second travel wheels 411, 412, while L1 has the greatest impact on the maximum torque required by the travel motor 42 to drive the first and second travel wheels 411, 412.

[0080] In summary, it can be analyzed that under different working conditions, the distance L1 between the first and second traveling wheels 411 and the radius R of the first traveling wheel 411 have a great influence on the maximum torque required by the traveling motor 42 to drive the first and second traveling wheels 411 and 412 to travel.

[0081] 3 and 4 , the ratio of the distance L1 between the first running wheel 411 and the second running wheel 412 to the radius R of the first running wheel 411 is ≥6.5. In some embodiments, the ratio of the distance L1 between the first running wheel 411 and the second running wheel 412 to the radius R of the first running wheel 411 is ≥7.

[0082] Table 1

[0083] Table 1 shows a comparison of the maximum torques of the first and second travel wheels 411, 412 of a conventional manned lawn mower under the first operating condition and a manned lawn mower according to the present invention after adjusting the R value at different ratios. It can be seen that under the first operating condition, when the radius R of the first travel wheel 411 is adjusted, the maximum torque required to drive the first and second travel wheels 411, 412 at the same target wheel speed changes. Furthermore, when the radius R of the first travel wheel 411 is reduced compared to that of a conventional manned lawn mower, the maximum torque required to drive the first and second travel wheels 411, 412 at the same target wheel speed is reduced compared to that of a conventional manned lawn mower.

[0084] Table 2

[0085] Table 2 shows a comparison of the maximum torques of the first and second travel wheels 411, 412 of a conventional manned lawn mower under the second operating condition and a manned lawn mower according to the present invention after adjusting the R value at different ratios. It can be seen that under the second operating condition, when the radius R of the first travel wheel 411 is adjusted, the maximum torque required to drive the first and second travel wheels 411, 412 changes. Furthermore, when the radius R of the first travel wheel 411 is reduced compared to that of a conventional manned lawn mower, the maximum torque required to drive the first and second travel wheels 411, 412 at the same target wheel speed is reduced compared to that of a conventional manned lawn mower.

[0086] In summary, it can be seen that under different operating conditions, when the radius R of the first running wheel 411 is reduced compared to that of a conventional manned lawn mower, the maximum torque required to drive the first running wheel 411 and the second running wheel 412 at the same target wheel speed is reduced. On this basis, as shown in Figures 3 and 4, in some embodiments, the radius R of the first running wheel 411 is ≤ 200mm. In some embodiments, the radius R of the first running wheel 411 is ≤ 190mm. In other embodiments, the radius R of the first running wheel 411 is ≤ 180mm. In other embodiments, the radius R of the first running wheel 411 is less than or equal to any value between 180mm and 200mm, which is not specifically limited here. At this time, the maximum torque required to drive the first running wheel 411 and the second running wheel 412 at the same target wheel speed is significantly reduced compared to a conventional manned lawn mower. Reducing torque can increase endurance, reduce temperature rise, and increase maximum working capacity, etc. Therefore, the manned lawn mower can adapt to working conditions with higher slopes and has better operating capabilities in extreme working conditions such as slope slip.

[0087] Table 3

[0088] Table 3 shows a comparison of the maximum torques of the first and second travel wheels 411, 412 of a conventional manned lawn mower under the first operating condition and a manned lawn mower according to the present invention after adjusting the L1 value at different ratios. It can be seen that under the first operating condition, when the distance L1 between the first and second travel wheels 411, 412 is adjusted, the maximum torque required to drive the first and second travel wheels 411, 412 at the same target wheel speed changes. Furthermore, when the distance L1 between the first and second travel wheels 411, 412 is increased compared to that of a conventional manned lawn mower, the maximum torque required to drive the first and second travel wheels 411, 412 at the same target wheel speed is reduced compared to that of a conventional manned lawn mower.

[0089] Table 4

[0090] Table 4 shows a comparison of the maximum torques of the first and second travel wheels 411, 412 of a conventional manned lawn mower under the second operating condition and a manned lawn mower according to the present invention after adjusting the L1 value at different ratios. It can be seen that under the second operating condition, when the distance L1 between the first and second travel wheels 411, 412 is adjusted, the maximum torque required to drive the first and second travel wheels 411, 412 at the same target wheel speed changes. Furthermore, when the distance L1 between the first and second travel wheels 411, 412 is increased compared to that of a conventional manned lawn mower, the maximum torque required to drive the first and second travel wheels 411, 412 at the same target wheel speed decreases compared to a conventional manned lawn mower.

[0091] In summary, it can be seen that under different working conditions, when the distance L1 between the first running wheel 411 and the second running wheel 412 increases on the basis of a conventional manned lawn mower, the maximum torque required to drive the first running wheel 411 and the second running wheel 412 to move at the same target wheel speed is reduced. On this basis, in some embodiments, as shown in Figures 3 and 4, the distance L1 between the first running wheel 411 and the second running wheel 412 is ≥ 1200mm. At this time, the maximum torque required to drive the first running wheel 411 and the second running wheel 412 to move at the same target wheel speed is significantly reduced compared to a conventional manned lawn mower. Reducing the torque can increase the endurance time, reduce the temperature rise, and increase the maximum working capacity, etc. Therefore, the manned lawn mower can adapt to working conditions with higher slopes and has better operating capabilities in extreme working conditions such as slope slippage.

[0092] In some embodiments, the distance L1 between the first running wheel 411 and the second running wheel 412 is greater than or equal to any value between 1200 mm and 1300 mm. In other embodiments, the distance L1 between the first running wheel 411 and the second running wheel 412 is ≥1220 mm. In other embodiments, the distance L1 between the first running wheel 411 and the second running wheel 412 is ≥1230 mm. In other embodiments, the distance L1 between the first running wheel 411 and the second running wheel 412 is ≥1240 mm. In other embodiments, the distance L1 between the first running wheel 411 and the second running wheel 412 is ≥1250 mm. In other embodiments, the distance L1 between the first running wheel 411 and the second running wheel 412 is ≥1260 mm. In other embodiments, the distance L1 between the first running wheel 411 and the second running wheel 412 is ≥1270 mm. In other embodiments, the distance L1 between the first running wheel 411 and the second running wheel 412 is ≥1280 mm. In other embodiments, the distance L1 between the first running wheel 411 and the second running wheel 412 is ≥ 1280 mm. In other embodiments, the distance L1 between the first running wheel 411 and the second running wheel 412 is ≥ 1290 mm. In other embodiments, the distance L1 between the first running wheel 411 and the second running wheel 412 is ≥ 1300 mm.

[0093] Table 5

[0094] Table 5 shows a comparison of the maximum torques of the first and second travel wheels 411, 412 of a conventional manned lawn mower under the first operating condition and a manned lawn mower according to the present invention after adjusting the L2 value at different ratios. It can be seen that, under the first operating condition, when the distance L2 between the midpoint d of the line connecting the axis of the first and second travel wheels 411, 412 and the center of gravity G of the manned lawn mower is adjusted, the maximum torque required to drive the first and second travel wheels 411, 412 at the same target wheel speed changes. Furthermore, when the distance L2 between the midpoint d of the line connecting the axis of the first and second travel wheels 411, 412 and the center of gravity G of the manned lawn mower is reduced compared to that of the conventional manned lawn mower, the maximum torque required to drive the first and second travel wheels 411, 412 at the same target wheel speed is reduced compared to that of the conventional manned lawn mower.

[0095] Table 6

[0096] Table 6 shows a comparison of the maximum torques of the first and second travel wheels 411, 412 of a conventional manned lawn mower under the second operating condition and of the manned lawn mower of the present invention after adjusting the L2 value at different ratios. It can be seen that under the second operating condition, when the distance L2 between the midpoint d of the line connecting the axis of the first and second travel wheels 411, 412 and the center of gravity G of the manned lawn mower is adjusted, the maximum torque required to drive the first and second travel wheels 411, 412 changes. Furthermore, when the distance L2 between the midpoint d of the line connecting the axis of the first and second travel wheels 411, 412 and the center of gravity G of the manned lawn mower is reduced compared to that of the conventional manned lawn mower, the maximum torque required to drive the first and second travel wheels 411, 412 at the same target wheel speed is reduced compared to that of the conventional manned lawn mower.

[0097] In summary, it can be seen that under different operating conditions, when the distance L2 from the midpoint d of the line connecting the axis of the first and second running wheels 411, 412 to the center of gravity G of the manned lawn mower is reduced compared to a conventional manned lawn mower, the maximum torque required to drive the first and second running wheels 411, 412 is reduced. Based on this, in some embodiments, as shown in Figures 3 and 4, the distance L2 from the midpoint d of the line connecting the axis of the first and second running wheels 411, 412 to the center of gravity G of the manned lawn mower is ≤ 200 mm. In this case, at the same target wheel speed, the maximum torque required to drive the first and second running wheels 411, 412 is significantly reduced compared to a conventional manned lawn mower. Reducing torque can increase endurance, reduce temperature rise, and improve maximum operating capacity. Therefore, the manned lawn mower can adapt to operating conditions with higher slopes and has better operating capabilities in extreme conditions such as slope slip.

[0098] Table 7

[0099] As shown in Table 7, a comparison of the maximum torque required to drive the first travel wheel 411 of a conventional manned lawn mower and a manned lawn mower when L1 = 1200 mm, R = 200 mm, and L2 = 200 mm is shown. It can be seen that in the conventional manned lawn mower, when the slope is 10° ≤ ≤ 20°, the maximum torque required to drive the first travel wheel 411 is greater than 70 N·m. For the manned lawn mower proposed in the present application, when the conditions of L1 = 1200 mm, R = 200 mm, and L2 = 200 mm are met, and when the slope is 10° ≤ ≤ 20°, at the same target wheel speed, the maximum torque required to drive the first travel wheel 411 is less than 70 N·m. This allows the manned lawn mower to adapt to conditions with higher slopes and has better operational capabilities in extreme slope conditions.

[0100] In some embodiments, when traveling on a slope with a slope of 10°≤≤20°, at the same target wheel speed, the maximum torque required to drive the first running wheel 411 and / or the second running wheel 412 is ≤70 N·m. Preferably, when traveling on a slope with a slope of 10°≤≤20°, at the same target wheel speed, the maximum torque required to drive the first running wheel 411 and / or the second running wheel 412 is ≤68 N·m. Preferably, when traveling on a slope with a slope of 10°≤≤20°, at the same target wheel speed, the maximum torque required to drive the first running wheel 411 and / or the second running wheel 412 is ≤65 N·m. This allows the manned lawn mower to adapt to conditions with higher slopes and has better slope operation capabilities.

[0101] The benefit of this application lies in that, through analysis, it is found that the distance L1 between the first and second travel wheels and the radius R of the first travel wheel both affect the maximum torque required by the travel motor to drive the first and second travel wheels to travel, so that the ratio of the distance L1 between the first and second travel wheels to the radius R of the first travel wheel is ≥6. At this time, the maximum torque of the travel motor to drive the first and second travel wheels is significantly reduced. Reducing the torque can improve the extreme working capabilities such as endurance and temperature rise. Therefore, the manned lawn mower can adapt to working conditions with higher slopes and has better operating capabilities in slope working conditions. The present application provides a manned lawn mower with slope operating capabilities. The manned lawn mower has lower torque requirements for the motor during turning and slope operations, slower temperature rise, and better endurance.

[0102] The above shows and describes 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 form, and any technical solutions obtained by equivalent replacement or equivalent transformation fall within the scope of protection of this application.

Claims

1. A manned lawn mower, comprising: A frame; A walking wheel set, mounted to the frame; The walking wheel set at least includes rear walking wheels, and the rear walking wheels include a first walking wheel and a second walking wheel; A walking motor, having a drive shaft, configured to drive the walking wheel set; A mowing element; Driven by a mowing motor; A power supply assembly, including at least one battery pack, configured to supply power to the walking motor and / or the mowing motor; Wherein, The ratio of the distance L1 between the first walking wheel and the second walking wheel to the radius R of the first walking wheel ≥ 6.

2. The manned lawn mower according to claim 1, wherein, The distance L1 between the first walking wheel and the second walking wheel ≥ 1200 mm.

3. The manned lawn mower according to claim 2, wherein, The distance L1 between the first walking wheel and the second walking wheel ≥ 1250 mm.

4. The manned lawn mower according to claim 1, wherein, The radius R of the first walking wheel and the second walking wheel ≤ 200 mm.

5. The manned lawn mower according to claim 1, wherein, The radius R of the first walking wheel and the second walking wheel ≤ 180 mm.

6. The manned lawn mower according to claim 1, wherein, The total energy of the power supply assembly is greater than or equal to 2 kW·h and less than or equal to 10 kW·h.

7. The manned lawn mower according to claim 1, wherein, The distance L2 from the midpoint of the line connecting the axles of the first walking wheel and the second walking wheel to the center of gravity of the manned lawn mower ≤ 200 mm.

8. The manned lawn mower according to claim 1, wherein, When traveling on a ramp with a slope of 10° ≤ slope ≤ 20°, the maximum torque required for the first walking wheel and / or the second walking wheel to walk ≤ 70 N·m.

9. The manned lawn mower according to claim 1, wherein, At least one of the battery packs is detachably mounted on the frame.

10. The manned lawn mower according to claim 1, wherein, The walking motor at least includes a first walking motor and a second walking motor. The first walking motor is configured to drive the first walking wheel, and the second walking motor is configured to drive the second walking wheel.

11. The manned lawn mower according to claim 1, wherein, The manned lawn mower is a riding lawn mower or a standing lawn mower.

12. The manned lawn mower according to claim 1, wherein, The energy of at least one battery pack of the power supply assembly is greater than or equal to 100 W·h and less than or equal to 2 kW·h.

13. A manned lawn mower, comprising: A frame; A walking wheel set, mounted to the frame; The walking wheel set at least includes rear walking wheels, and the rear walking wheels include a first walking wheel and a second walking wheel; A walking motor, having a drive shaft, configured to drive the walking wheel set; A mowing element; Driven by a mowing motor; A power supply assembly, including at least one battery pack, configured to supply power to the walking motor and / or the mowing motor; Wherein, The distance L1 between the first walking wheel and the second walking wheel ≥ 1200 mm.

14. The manned lawn mower according to claim 13, wherein, The distance L1 between the first walking wheel and the second walking wheel ≥ 1250 mm.

15. The manned lawn mower according to claim 13, wherein, The radius R of the first walking wheel and the second walking wheel ≤ 200 mm.

16. An outdoor walking device, comprising: A frame; A walking wheel set, mounted to the frame; The walking wheel set at least includes rear walking wheels, and the rear walking wheels include a first walking wheel and a second walking wheel; A walking motor, having a drive shaft, configured to drive the walking wheel set; A mowing element; Driven by a mowing motor; A power supply assembly, including at least one battery pack, configured to supply power to the walking motor and / or the mowing motor; The ratio of the distance L1 between the first walking wheel and the second walking wheel to the radius R of the first walking wheel ≥ 6.

17. The outdoor walking device according to claim 16, wherein, The outdoor walking device is a manned snow sweeper, a manned lawn mower or an all-terrain vehicle.

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