Lawn mower

Abstract

The utility model discloses a mower which comprises a frame, a cutting deck connected to the bottom of the frame and horizontally arranged relative to the ground, and at least one cutting device connected to the cutting deck, and the cutting device comprises a motor and a cutter head assembly connected to an output shaft of the motor and used for cutting. The cutterhead assembly is accommodated in an accommodating space formed by the cutting deck; the plane where a cutting track formed by blades of the cutterhead assembly is located is inclined relative to the plane where the cutting deck is located. According to the mower provided by the embodiment of the invention, the cutting track formed by the blades of the cutter head assembly is obliquely arranged relative to the plane where the cutting deck is located, namely, the cutting track is obliquely arranged relative to the horizontal plane, so that forward inclination of the cutter head assembly is realized, a lawn can be prevented from being cut for multiple times, and meanwhile, the mowing flatness is ensured; and the cutting deck can be horizontally arranged, so that the cutting deck does not need to incline forwards while the cutter head assembly inclines forwards, and the risk that the cutting deck touches the ground is greatly reduced.

Description

[0001] This application claims priority to Chinese patent application filed on May 30, 2023 and application number CN202310626796.0, the entire contents of which are incorporated by reference into this application. Technical Field

[0002] The present disclosure relates to the technical field of garden machinery, and in particular to a lawn mower. Background Art

[0003] Nowadays, power tools such as lawn mowers, leaf blowers, snow blowers, vacuum blowers, chain saws, etc. are widely used in industry, construction, gardening, housework and around the house, bringing great convenience to people's work and life. As modern life pays more and more attention to greening, there are more and more lawns, and lawn mowers are one of the indispensable tools for trimming and maintaining lawns.

[0004] Generally speaking, when existing lawn mowers are mowing the grass, the ground will be uneven to a certain extent, resulting in the whole machine being not completely parallel to the ground. If the blade disc is higher in the front and lower in the back, the rotating blade disc will cut the grass multiple times, resulting in increased energy consumption. In order to ensure that the blade disc only cuts the grass once, the blade disc needs to be installed with a certain forward tilt angle. In order to achieve the forward tilt of the blade disc, the cutting deck on which the blade disc is installed is installed forwardly tilted, but this structure makes the cutting heights of the front and rear blade discs inconsistent, resulting in poor cutting flatness, and the front of the cutting deck is at risk of touching the ground and damaging the lawn. Summary of the invention

[0005] The object of the present disclosure is to provide a lawn mower which can ensure good cutting smoothness and low risk of touching the ground.

[0006] The present disclosure provides a lawn mower, comprising:

[0007] Frame;

[0008] a cutting deck connected to the bottom of the frame and arranged horizontally relative to the ground;

[0009] at least one cutting device connected to the cutting deck, comprising a motor and a cutter head assembly connected to an output shaft of the motor and used for cutting, the cutter head assembly being received in a receiving space formed by the cutting deck;

[0010] Wherein, the surface where the cutting track formed by the blade of the cutter disc assembly is located is inclined compared to the surface where the cutting deck is located.

[0011] In the lawn mower provided by the embodiments of the present disclosure, since the cutting trajectory formed by the blades of the cutter head assembly is inclined with respect to the plane where the cutting deck is located, that is, inclined with respect to the horizontal plane, the forward inclination of the cutter head assembly is realized, so that multiple cuts of the lawn can be avoided, and the flatness of mowing can be ensured at the same time; and the cutting deck can also be set horizontally, so that while the forward inclination of the cutter head assembly is realized, it is not necessary for the cutting deck to incline forward, greatly reducing the risk of the cutting deck touching the ground.

[0012] In one embodiment, the cutter head assembly includes at least two layers of blades arranged along the extending direction of the output shaft, and the inclination angle of the plane where the cutting trajectory of each layer of blades is located with respect to the plane where the cutting deck is located is the same.

[0013] In one embodiment, there is a height difference A1 between the lowest point and the highest point of the cutting trajectory formed by at least one blade of the cutter head assembly, and the value range of the height difference A1 is: 4mm < A1 < 15mm, where the lowest point is located in the forward direction of the traveling direction of the lawn mower, and the highest point is located in the backward direction of the traveling direction of the lawn mower.

[0014] In one embodiment, the cutting deck includes a top plate arranged parallel to the horizontal plane and a plurality of side plates connected to the top plate. The top plate and the side plates enclose to form the accommodation space. The motor is installed on the top plate, and the output shaft of the motor is perpendicular to the plane where the cutting trajectory formed by the blades of the cutter head assembly is located.

[0015] In one embodiment, the top plate includes a support surface inclined with respect to the plane where the top plate is located. The motor is installed on the support surface so that the plane where the cutting trajectory formed by the blades of the cutter head assembly is located is inclined with respect to the plane where the cutting deck is located.

[0016] In one embodiment, the top plate includes a support surface arranged parallel to the plane where the top plate is located. The motor is installed on the support surface, and a gasket is arranged between the motor and the support surface so that the plane where the cutting trajectory formed by the blades of the cutter head assembly is located is inclined with respect to the plane where the cutting deck is located.

[0017] In one embodiment, the top plate includes at least one support surface arranged parallel to the plane where the top plate is located. The motor is installed on the support surface, and the surface of the motor in contact with the support surface is an inclined surface so that the plane where the cutting trajectory formed by the blades of the cutter head assembly is located is inclined with respect to the plane where the cutting deck is located.

[0018] The present disclosure also provides a lawn mower, including:

[0019] A frame;

[0020] a cutting deck connected to the bottom of the frame and arranged horizontally relative to the ground;

[0021] at least one cutting device connected to the cutting deck, comprising a motor and a cutter head assembly connected to an output shaft of the motor and used for cutting, the cutter head assembly being received in a receiving space formed by the cutting deck;

[0022] Wherein, the cutter disc assembly is arranged horizontally relative to the ground, and the output shaft is arranged inclined relative to the horizontal plane.

[0023] In the lawn mower provided by the embodiment of the present disclosure, the cutter disc assembly is horizontally arranged relative to the ground, the output shaft is inclined relative to the horizontal plane, and the surface where the cutting track formed by the blades of the cutter disc assembly is located is inclined compared to the surface where the cutting deck is located, thereby avoiding multiple lawn cutting while ensuring the flatness of the mowing; and the cutting deck can also be arranged horizontally, so that the cutting disc assembly does not need to be tilted forward while the cutting deck does not need to be tilted forward, which greatly reduces the risk of the cutting deck touching the ground.

[0024] The present disclosure also provides a lawn mower, comprising:

[0025] Frame;

[0026] cutting a deck to be connected to the bottom of the frame;

[0027] at least one cutting device connected to the cutting deck, comprising a motor and a cutter disc assembly connected to the output shaft of the motor and used for cutting, the cutter disc assembly being received in the accommodation space formed by the cutting deck, the cutter disc assembly comprising at least two layers of blades arranged along the extension direction of the output shaft;

[0028] The surface where the cutting track formed by the blade is located is inclined compared to the horizontal plane.

[0029] The lawn mower with multi-layer blades provided by the disclosed embodiment has a cutting trajectory formed by the blades of the cutter disc assembly that is inclined compared to the surface where the cutting deck is located, that is, it is inclined relative to the horizontal plane, so that the cutter disc assembly can be tilted forward, thereby avoiding multiple lawn cutting and ensuring the flatness of the mowing; and the cutting deck can also be set horizontally, so that the cutting deck does not need to be tilted forward while the cutter disc assembly can be tilted forward, which greatly reduces the risk of the cutting deck touching the ground.

[0030] The present disclosure also provides a lawn mower, comprising:

[0031] Frame;

[0032] cutting a deck to be connected to the bottom of the frame;

[0033] At least three cutting devices arranged in a front-to-back manner and connected to the cutting deck, including a motor and a cutter disc assembly connected to the output shaft of the motor and used for cutting, wherein the cutter disc assembly includes at least two layers of blades arranged along the extension direction of the output shaft; the layer with the largest diameter of the cutting track is the first cutting blade layer, and one or more layers with a smaller diameter of the cutting track than the first cutting blade layer are the second cutting blade layer;

[0034] There is a gap between the outer edges of the cutting tracks of the first cutting blade layers of two adjacent cutter disc assemblies, and the cutting tracks of the second cutting blade layers of two adjacent cutter disc assemblies at least partially overlap in the cutting width direction, and the cutting width direction is perpendicular to the moving direction of the lawn mower.

[0035] In the lawn mower in the disclosed embodiment, by setting the positions of the blade layers of the cutter disc assembly, both blade interference and the problem of missed cutting are avoided, thereby improving the cutting efficiency of the lawn mower.

[0036] In one embodiment, the distance between the centers of two adjacent cutter disc assemblies is L1, the distance between the centers of two non-adjacent cutter disc assemblies is L2, and the ratio of L1 / L2 is between 0.4 and 0.8. Preferably, the ratio of L1 / L2 is 0.62.

[0037] In one embodiment, the distance between the second cutting blade layer of the cutter disc assembly located in front of the travel direction of the lawn mower and the front end of the cutting deck is L3, L3>a*V, a is determined based on the lifting rate of the grass, and V is the travel speed of the lawn mower.

[0038] In one embodiment, the second cutting blade layer of the cutter disc assembly located behind the direction of travel of the mower is at a horizontal distance L4 from the side edge of the cutting deck along the direction of the mower, and L4 is the same or different from the value of L3, and L4>a*V.

[0039] In one embodiment, the width of the cutting deck is L5, and the value range of L5 is 850 mm to 1060 mm.

[0040] In one embodiment, the cutting deck is horizontally arranged relative to the ground, the cutter disc assembly is accommodated in a receiving space formed by the cutting deck, and the cutting track of the blade of the cutter disc assembly is inclined relative to the horizontal plane.

[0041] The present disclosure provides a lawn mower, comprising: a frame;

[0042] a cutting deck connected to the bottom of the frame and arranged horizontally relative to the ground;

[0043] Three cutting devices arranged in a front-to-back spacing are connected to the cutting deck, including a motor and a cutter disc assembly connected to the output shaft of the motor and used for cutting, wherein the center line of the three cutter disc assemblies forms an acute triangle;

[0044] The cutter disc assembly includes at least two layers of blades arranged along the extension direction of the output shaft; extending along the output shaft of the motor toward the ground, the diameter of the cutting track formed by each layer of blades decreases successively, or the cutter disc assembly includes a single layer of flanging blades.

[0045] In the lawn mower in the disclosed embodiment, by setting the positions of the blade layers of the cutter disc assembly, both blade interference and the problem of missed cutting are avoided. BRIEF DESCRIPTION OF THE DRAWINGS

[0046] In order to more clearly illustrate the technical solutions of the embodiments of the present disclosure, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present disclosure and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without paying creative work.

[0047] Figure 1 The figure is a schematic diagram of a partial cross-sectional structure of a lawn mower according to an embodiment of the present disclosure.

[0048] Figure 2 for Figure 1 A partial enlarged view of .

[0049] Figure 3 for Figure 1 A schematic diagram of the three-dimensional structure of the cutting deck of the lawn mower shown.

[0050] Figure 4 It is a partial structural schematic diagram of a lawn mower according to another embodiment of the present disclosure.

[0051] Figure 5 It is a partial structural schematic diagram of a lawn mower according to an embodiment of the present disclosure.

[0052] Figure 6 for Figure 5 Schematic diagram of the three-dimensional structure.

[0053] Figure 7 for Figure 5 Schematic diagram of the working range of the cutter disc assembly.

[0054] Figure 8 For along Figure 6 Partial cross-sectional view along the XX direction.

[0055] Fig. 9 for Figure 6A schematic structural diagram of a bottom plate of another embodiment of a cutting deck of a lawn mower is shown. DETAILED DESCRIPTION

[0056] The specific embodiments of the present disclosure will be described in detail below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present disclosure, rather than all of the embodiments. Based on the description of the present disclosure, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present disclosure.

[0057] In the description of the present disclosure, unless otherwise clearly specified and limited, the terms "set", "install", "connection" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms can be understood according to specific circumstances.

[0058] The directions or positional relationships indicated by terms such as “upper”, “lower”, “left”, “right”, “front”, “back”, “top”, “bottom”, “inside” and “outside” are based on the directions or positional relationships shown in the accompanying drawings, or are the directions or positional relationships in which the disclosed products are usually placed when in use. They are only for the convenience of description and simplified description, and do not indicate or imply that the devices or elements referred to must have a specific direction, be constructed and operated in a specific direction, and therefore should not be understood as limitations on the present disclosure.

[0059] The terms "first", "second", "third" and the like are merely used to distinguish elements of similar nature, and do not indicate or imply relative importance or a particular order.

[0060] The terms "comprises," "comprising," or any other variations thereof, are intended to cover a non-exclusive inclusion of the elements listed and may also include additional elements not expressly listed.

[0061] Please refer to Figure 1 and Figure 2, in one embodiment of the present disclosure, the lawn mower provided includes a frame (not shown in the figure), a cutting deck 11, and at least one cutting device. The cutting deck 11 is connected to the bottom of the frame and is horizontally arranged relative to the ground. The cutting device is connected to the cutting deck 11 and includes a motor 15 and a cutter head assembly 13 connected to the output shaft 152 of the motor 15 and used for cutting. The cutter head assembly 13 is housed in the accommodation space formed by the cutting deck 11 to improve the safety of the lawn mower and avoid the cutter head assembly 13 from causing harm to the user. Among them, the plane where the blades of the cutter head assembly 13 form the cutting trajectory is inclined relative to the plane where the cutting deck 11 is located. Specifically, the cutter head assembly 13 is connected to the motor 15 and can be driven by the motor 15 to rotate, thereby realizing the lawn mowing operation. Since the cutting deck 11 is horizontally arranged relative to the ground, when the cutter head assembly 13 rotates, the cutting trajectory formed by the blades of the cutter head assembly 13 is inclined relative to the horizontal plane, which can make the cutting height at the front end of the cutter head assembly 13 greater than that at the rear end, avoid cutting the lawn multiple times, and save energy consumption.

[0062] In the lawn mower of this embodiment, since the cutting trajectory formed by the blades of the cutter head assembly 13 is inclined relative to the horizontal plane to realize the forward inclination of the cutter head assembly 11, it can not only avoid cutting the lawn multiple times, but also ensure the flatness of mowing; and the cutting deck 11 can be horizontally arranged, so that while realizing the forward inclination of the cutter head assembly 13, there is no need for the cutting deck 11 to be forward inclined, greatly reducing the risk of the cutting deck 11 touching the ground (especially suitable for low mowing).

[0063] In this embodiment, there is a height difference A1 between the lowest point and the highest point of the cutting trajectory formed by the blades of the cutter head assembly 13, where the lowest point is in the forward direction of the traveling direction of the lawn mower ( Figure 1 the arrow F in the figure is the traveling direction of the lawn mower), and the highest point is in the backward direction of the lawn mower and the traveling direction. That is, with the traveling direction of the lawn mower as the front, the front end of the cutter head assembly 13 is lower than its rear end. Specifically, the value range of the height difference A1 is: 4mm < A1 < 15mm (millimeters). In this way, it can not only avoid cutting the lawn multiple times and ensure the flatness of cutting. When the height difference A1 is less than 4mm, the flatness of cutting cannot be guaranteed. When the height difference A1 is greater than 15mm, it will cause the result that the lawn is low in the middle and high on both sides, and the cutting is uneven. Preferably, the height difference A1 is 6mm.

[0064] In this embodiment, the cutting device is installed at an inclination angle α relative to the horizontal plane. The inclination angle α of the cutter head assembly 13 relative to the horizontal plane can be determined according to the height difference A1. When the diameter of the cutter head assembly 13 is determined, the greater the height difference A1, the greater the inclination angle α.

[0065] There may be multiple cutting devices. In this embodiment, there are three cutting devices. It is understood that there may be one, two or more cutting devices, which are not limited here. The lowest points of the cutting tracks of the multiple cutting devices are at the same height, and the highest points of the cutting tracks are at the same height, that is, the blade disc assemblies 13 of the multiple cutting devices are located at the same height. By arranging the multiple blade disc assemblies 13 at the same height, multiple lawn cutting can be avoided, and the flatness of the cutting can also be ensured. In order to arrange the layout reasonably, the multiple cutting devices are arranged at intervals in the front and back direction of the lawn mower to improve the space utilization rate and avoid the lawn mower from missing grass. The cutting deck 11 of this embodiment is arranged horizontally. Even if the arrangement of multiple blade disc assemblies 13 increases the size of the cutting deck 11 in the front and back direction, the risk of the cutting deck 11 touching the ground is low (especially suitable for low cutting). However, in a conventional lawn mower, the arrangement of multiple blade disc assemblies 13 will increase the size of the cutting deck 11 in the front and back direction of the lawn mower, thereby increasing the forward tilt height of the cutting deck 11, and thus greatly increasing the risk of the cutting deck 11 touching the ground.

[0066] The cutting tracks formed by the blades of the multiple cutter disc assemblies 13 have the same inclination angle relative to the horizontal plane, and the diameters of the multiple cutter disc assemblies 13 are also the same. In this way, the lowest and highest points of the cutting tracks of the multiple cutter disc assemblies 13 are at the same height. It is understood that the diameters of the multiple cutter disc assemblies 13 may also be different, in which case the cutting tracks of the multiple cutter disc assemblies 13 have different inclination angles relative to the horizontal plane.

[0067] In this embodiment, the blade disc assembly 13 includes a blade disc body 132 and a plurality of blades 134 arranged at the periphery of the blade disc body 132, and the blades 134 include at least two layers of blades 134 arranged along the extension direction of the output shaft 152 of the motor 15. The plane where the cutting track of each layer of blades 134 is located has the same inclination angle relative to the surface where the cutting deck 11 is located. More specifically, the layer of blades with the largest diameter of the cutting track is the first cutting blade layer (i.e., the top layer), and the layer or layers with a smaller diameter of the cutting track than the diameter of the cutting track of the first cutting blade layer are the second cutting blade layer. In other words, from the top layer to the bottom layer, the diameter of the cutting track of the blade 134 decreases successively. In the blade disc assembly 13 with a multi-layer blade structure, by horizontally arranging the cutting deck 11, even if the arrangement of the multi-layer blade structure increases the distance between adjacent blade disc assemblies 13 in order to avoid interference, and further increases the size of the cutting deck 11 in the front-to-back direction, the risk of the cutting deck 11 touching the ground is also low. However, in a conventional lawn mower, providing a multi-layer blade structure will increase the size of the cutting deck 11 in the front-to-back direction. Under the premise that the cutting deck 11 has the same inclination angle, the forward inclination height of the cutting deck 11 will be increased, thereby greatly increasing the risk of the cutting deck 11 touching the ground.

[0068] In other embodiments, the cutter head assembly 13 may also be a straight knife structure, a single-layer blade structure, or other types of blade structures or other types of layout structures, which are not specifically limited herein.

[0069] Please refer to Figure 3 , the cutting deck 11 includes a top plate 114 disposed parallel to the horizontal plane and a plurality of side plates 119 connected to the top plate 114. The top plate 114 and the side plates 119 enclose a receiving space to receive the cutter head assembly 13. In another embodiment, the cutting deck 11 further includes a bottom plate 112 connected to the side plates 119. Both the bottom plate 112 and the top plate 114 are parallel to the horizontal plane, and the cutting deck 11 is horizontally disposed relative to the ground, that is, the bottom plate 112 and the top plate 114 are parallel to the horizontal plane, and the side plates 119 are perpendicular to the horizontal plane. The top plate 114, the side plates 119, and the bottom plate 112 enclose the above-mentioned receiving space. Further improve the safety performance of the lawn mower during use. Obviously, the bottom plate 112 seals the receiving space, and the cutter head assembly 13 performs cutting work through the bottom of the receiving space.

[0070] The top plate 114 includes a support surface 118 inclined relative to the top plate 114. The motor 15 is installed on the support surface 118 so that the plane where the cutting trajectory formed by the blades of the cutter head assembly 13 is inclined relative to the plane where the cutting deck 11 is located. Specifically, an installation hole 116 for installing the motor 15 is formed in the top plate 114, and the motor 15 extends from one side of the top plate 114 through the installation hole 116 to the other side of the top plate 114. The support surface 118 is located around the installation hole 116. The support surface 118 is inclined at an angle α relative to the top plate 114.

[0071] Specifically, in this embodiment, three installation holes 116 are formed in the top plate 114, and three motors 15 can be correspondingly installed. The three motors 15 can respectively drive the three cutter head assemblies 13 to rotate and work. The three installation holes 116 are arranged at intervals in the front-rear direction of the lawn mower, so that the three cutter head assemblies 13 are distributed at intervals in the front-rear direction. More specifically, the three installation holes 116 are arranged in a "pin" shape. It can be understood that multiple cutter head assemblies 13 can also be connected to the same motor 15 and driven to rotate by the same motor 15.

[0072] It should be noted that in this embodiment, the output shaft 152 of the motor 15 can rotate around the axis X. When the cutter head assembly 13 is installed on the output shaft 152 of the motor 15, the output shaft 152 of the motor 15 is perpendicular to the plane where the cutting trajectory formed by the blades of the cutter head assembly 13 is located. The included angle between the axis X and the top plate 114 of the cutting deck 11 is 90° - α, so that the plane where the cutting trajectory of the cutter head assembly 13 is located is parallel to the support surface 118, so that the inclination angle of the cutter head assembly 13 relative to the top plate 114 is the same as the inclination angle of the support surface 118 relative to the bottom plate 112, which is also α.

[0073] The above is to tilt the cutterhead assembly 13 connected to the motor 15 by tilting the motor 15 on the tilted support surface 118. It can be understood that other methods can also be used to tilt the cutterhead assembly 13. In another embodiment, the support surface 118 can be set to be parallel to the surface where the top plate 114 is located, and the surface where the motor 15 abuts against the cutting deck 11 is an inclined surface, so that the motor 15 is installed on the cutting deck 11 and has a certain tilt angle with the cutting deck 11. In this way, after the motor 15 is installed on the support surface 118, the motor 15 is tilted on the cutting deck 11, thereby tilting the cutterhead assembly 13 installed on the motor 15. In another embodiment, the support surface 118 is set to be parallel to the surface where the top plate 114 is located, and a gasket is provided between the motor 15 and the support surface 118, so that the motor 15 is tilted at a certain angle relative to the cutting deck 11. Specifically, the thickness of the gasket is uneven, and its tilt angle α. More specifically, the thickness of the gasket gradually increases from a starting point to a midpoint, so that the motor 15 can also be tilted on the cutting deck 11, thereby tilting the cutter head assembly 13 mounted on the motor 15.

[0074] In this embodiment, the output shaft 152 of the motor 15 can be fixedly sleeved with a first coupling member 154, and the cutter head assembly 13 is connected to the first coupling member 154 through a first connecting member 155, so that the cutter head assembly 13 is fixedly connected to the motor 15. Specifically, the output shaft 152 of the drive can also be fixedly sleeved with a second coupling member 157, and the cutter head assembly 13 is also connected to the second coupling member 157 through a second connecting member 158, so that the connection strength between the cutter head assembly 13 and the motor 15 can be strengthened.

[0075] In the present embodiment, the cutting deck 11 is also provided with tires 17 to facilitate the lawn mower to walk along the ground. Specifically, two tires 17 can be provided at the front end of the lawn mower.

[0076] In this embodiment, the bottom of the cutting deck 11 is open to expose the cutter head assembly 13 from the bottom, so that the cutter head assembly 13 can cut grass.

[0077] In this embodiment, the lawn mower may be a push lawn mower or a ride-on lawn mower. Of course, the lawn mower may also be an automatic lawn mowing robot.

[0078] Please refer to Figure 4 Another embodiment of the present disclosure provides a lawn mower, including a frame, a cutting deck 11, a blade disc assembly 13 and a motor 15. The cutting deck 11 is connected to the bottom of the frame and is arranged horizontally relative to the ground. The blade disc assembly 13 is connected to the motor 15 and can be driven to rotate by the motor 15 to achieve a lawn mowing operation. The blade disc assembly 13 is arranged horizontally relative to the ground, and the output shaft of the motor 15 is arranged obliquely relative to the horizontal plane, so that even if the blade disc assembly 13 is installed horizontally, the cutting trajectory of the blade disc assembly 13 can still be arranged obliquely relative to the horizontal plane, thereby avoiding multiple lawn cutting.

[0079] In the lawn mower of this embodiment, since the cutter disc assembly is arranged parallel to the cutting deck and the output shaft of the motor is arranged inclined relative to the cutter disc assembly, the cutter disc assembly can be tilted forward when rotating, thereby avoiding multiple lawn cutting and ensuring the flatness of the mowing; and the cutting deck can also be arranged horizontally, so that the cutter disc assembly can be tilted forward without tilting the cutting deck forward, which greatly reduces the risk of the cutting deck touching the ground.

[0080] In this embodiment, the number of the blade disc assembly 13 may be one, two, three or more. When the number of the blade disc assembly 13 is two or more, the heights of the blade disc assemblies 13 are the same. Specifically, the blade disc assembly 13 may also be a multi-layer blade structure. No further details are given here.

[0081] Please refer to Figure 5 and Figure 6 A lawn mower according to an embodiment of the present disclosure includes a frame (not shown), a cutting deck 11 connected to the bottom of the frame, and at least three cutting devices connected to the cutting deck 11 and arranged in a front-to-back manner. The cutting device includes a motor 15, and a cutter disc assembly 13 connected to the output shaft 152 of the motor 15 and used for cutting. The cutter disc assembly 13 is accommodated in the accommodation space formed by the cutting deck 11. In this embodiment, three cutting devices are taken as an example for detailed description. In other embodiments, the number of cutting devices may also be four, five, etc. The cutter disc assembly 13 includes at least two layers of blades arranged along the extension direction of the output shaft, the layer with the largest diameter of the cutting track is the first cutting blade layer (i.e., the top layer), the layer or layers with a smaller diameter of the cutting track than the first cutting blade layer are the second cutting blade layer, and the layer with the smallest diameter of the cutting track is the bottom blade.

[0082] There is a gap between the outer edges of the cutting tracks of the first cutting blade layers of two adjacent cutter disc assemblies 13, that is, along the direction of travel of the mower, there is a gap between the outer edges of the cutting tracks of the first cutting blade layers of the front cutter disc assembly 13 and the rear cutter disc assembly 13. Figure 7 The cutting tracks C of the first cutting blade layers of two adjacent cutter disc assemblies 13 do not intersect, and the two adjacent cutter disc assemblies 13 do not interfere with each other during rotation, thereby ensuring the smooth operation of the lawn mower and avoiding damage to the blades. The cutter disc assembly 13 located in the front is the first to perform the cutting operation in the walking direction of the lawn mower, and the cutter disc assembly 13 located in the rear performs the cutting operation next.

[0083] The cutting tracks of the second cutting blade layers of two adjacent blade disc assemblies 13 at least partially overlap in the cutting width direction, and the cutting width direction is perpendicular to the direction of travel of the lawn mower. Figure 7, the cutting tracks D of the front cutter disc assembly 13 and the second cutting blade layer of the rear cutter disc assembly 13 overlap by a width B2. This arrangement ensures that the mower does not miss any cuts.

[0084] In the prior art, there is only one layer of blades, and the blades are arranged to ensure that the cutting tracks of the blades do not intersect, and the cutting tracks of adjacent blades overlap by a certain width perpendicular to the forward direction. However, for multi-layer blades, the arrangement requirements cannot be met, and there will be interference between adjacent blades or missed cutting between the blade discs. In the present application, the first cutting blade layer with the largest cutting track diameter of adjacent blade discs does not intersect, and the second cutting blade layer with a smaller rotation track overlaps by a certain width perpendicular to the forward direction to ensure that no cutting is missed.

[0085] In this embodiment, the gap between the outermost edges of the cutting tracks C of the first cutting blade layers of two adjacent cutter disc assemblies 13 may be 5 to 20 mm. Specifically, the gap is preferably 11 mm.

[0086] In this embodiment, one cutter disc assembly 13 is arranged at the front end of the lawn mower, and two cutter disc assemblies 13 are arranged side by side at the rear end of the lawn mower. The front end refers to the front of the lawn mower in the direction of travel.

[0087] In this embodiment, the center line of the three blade disc assemblies 13 is an acute triangle. Extending toward the ground along the output shaft of the motor 15, the diameter of the cutting track formed by each layer of blades decreases successively (that is, the diameter of the cutting track of the top layer of blades is greater than the diameter of the cutting track of the bottom layer of blades), forming an inverted tower structure. Of course, the blade disc assembly 13 may also include only a single layer of flanged blades.

[0088] In this embodiment, the cutting deck 11 is arranged horizontally relative to the ground, and the cutting trajectory of the blades of the cutter head assembly 13 is arranged obliquely relative to the horizontal plane. In this way, when the cutter head assembly 13 rotates, there is a height difference A1 between the lowest point and the highest point of at least one cutting trajectory of the blades of the cutter head assembly 13, where the lowest point is in the forward direction of the mower's traveling direction and the highest point is in the backward direction of the mower and the traveling direction, so that the cutting height at the front end of the cutter head assembly 13 is greater than the cutting height at the rear end, avoiding multiple cuts on the lawn. That is, with the mower's traveling direction as the front, the front end of the cutter head assembly 13 is lower than its rear end. Specifically, the value range of the height difference A1 is: 4 mm < A1 < 15 mm (millimeters). In this way, it can not only avoid multiple cuts on the lawn and ensure the flatness of cutting. When the height difference A1 is less than 4 mm, the flatness of cutting cannot be ensured. When the height difference A1 is greater than 15 mm, it will cause the lawn to be lower in the middle and higher on both sides, resulting in uneven cutting. Preferably, the height difference A1 is 6 mm. Since the cutting deck 11 is arranged horizontally and the cutting trajectory of the cutter head assembly 13 is inclined, the forward tilt of the cutter head assembly is realized, thus avoiding multiple cuts on the lawn and ensuring the flatness of mowing at the same time; and the cutting deck can also be arranged horizontally, so that while realizing the forward tilt of the cutter head assembly, there is no need for the cutting deck to tilt forward, greatly reducing the risk of the cutting deck touching the ground.

[0089] In this embodiment, the highest point and the lowest point of the cutting trajectory of the first cutting blade layer of each cutter head assembly 13 are the same, and the highest point and the lowest point of the cutting trajectory of the second cutting blade layer of each cutter head assembly 13 are the same. That is, the inclination angles of the blade layers of the corresponding layers of each cutter head assembly 13 are the same and the heights are the same.

[0090] Please refer to Figure 5 and Figure 6 , in this embodiment, the cutting deck 11 includes a top plate 114 arranged parallel to the horizontal plane and a plurality of side plates 119 connected to the top plate 114. The top plate 114 and the side plates 119 enclose an accommodation space to accommodate the cutter head assembly 13. In this embodiment, please also refer to Figure 8 , there are bottom plates 121 provided on both sides of the rear part of the cutting deck 11. The bottom plates 121 are connected to the bottoms of the side plates 119 of the cutting deck 11, and the bottom plates 121 are in a flat plate shape. The top plate 114, the side plates 119 and the bottom plate 112 enclose the above accommodation space. Further improve the use safety performance of the mower. Please refer to Fig. 9 , in another embodiment, the bottom plate 121 of the cutting deck 11 is an inclined plate inclined towards the inside of the cutting deck 11. By providing the bottom plates 121 on both sides of the cutting deck 11, grass clippings can be blocked from falling on the lawn along the sides to form grass clipping accumulation, thus avoiding leaving a grass clipping path on the side edge path of the cutting deck 11. In this embodiment, a grass outlet 123 is provided at the rear end of the cutting deck 11 to facilitate the discharge of grass clippings.

[0091] The top plate 114 includes a support surface 118 that is inclined relative to the top plate 114. The motor 15 is mounted on the support surface 118 such that the plane where the cutting trajectory formed by the blades of the cutter head assembly 13 is inclined relative to the plane where the cutting deck 11 is located. Specifically, mounting holes 116 for mounting the motor 15 are formed in the top plate 114, and the motor 15 passes through the mounting holes 116 from one side of the top plate 114 and extends to the other side of the top plate 114. The support surface 118 is located around the mounting holes 116. The support surface 118 is inclined at an angle α relative to the top plate 114. Specifically, in this embodiment, three mounting holes 116 are formed in the top plate 114, and three motors 15 can be correspondingly mounted. The three motors 15 can respectively drive the three cutter head assemblies 13 to rotate and work. The three mounting holes 116 are arranged in a staggered manner in the front-rear direction of the mower, so that the three cutter head assemblies 13 are distributed at intervals in the front-rear direction. More specifically, the three mounting holes 116 are arranged in a "pin" shape. It can be understood that multiple cutter head assemblies 13 can also be connected to the same motor 15 and driven to rotate by the same motor 15.

[0092] In this embodiment, the lowest points and the highest points of the cutting trajectories of the corresponding layer blades of the multiple cutter head assemblies 13 are the same. That is to say, the blade layers at the top of the multiple cutter head assemblies 13 are at the same height, the blade layers in the middle are at the same height, and the blade layers at the bottom are at the same height. By making the multiple cutter head assemblies 13 at the same height, multiple cuts of the lawn can be avoided, the flatness of the cut can be ensured, and the cutting deck 11 is horizontally arranged. Even if the setting of the multiple cutter head assemblies 13 increases the size of the cutting deck 11 in the front-rear direction, the risk of the cutting deck 11 touching the ground is relatively low. However, in traditional mowers, setting multiple cutter head assemblies 13 will increase the size of the cutting deck 11 in the front-rear direction, thereby increasing the height of the forward tilt of the cutting deck 11, so the risk of the cutting deck 11 touching the ground will be greatly increased. Specifically, in this embodiment, the inclination angles of the multiple cutter head assemblies 13 relative to the horizontal plane are the same, and the diameters of the multiple cutter head assemblies 13 are also the same.

[0093] In this embodiment, the cutter head assembly 13 can rotate forward and backward, and the forward and backward rotations of the cutter head assembly 13 are alternated. The cutter head assembly 13 can automatically turn to extend the service life of the blade without the need for frequent manual tool changing. Specifically, in one embodiment, the forward and backward rotations are reversed every predetermined time; in another embodiment, the forward and backward rotations are reversed each time the cutter stops and then starts again. Specifically, the rotation directions of the multiple cutter head assemblies 13 can be the same or different. Generally speaking, the cutting effect is better when the rotation directions of the multiple cutter head assemblies 13 are the same.

[0094] Please refer to Figure 5In this embodiment, the blade disc assembly 13 includes a blade disc body 132 and a plurality of blades 134 arranged at the periphery of the blade disc body 132. It can be understood that the blade disc assembly 13 can also be a straight blade structure. Specifically, the blade disc assembly 13 also includes a spacer 136 and an insertion shaft 137, the insertion shaft 137 is fixedly connected to the blade disc body 132, the blades 134 are sleeved on the insertion shaft 137, and a spacer 136 is provided between the blades 134 of adjacent layers. The spacer 136 separates the blades 134 so that the blades 134 are located at different layers.

[0095] See also Figure 7 In this embodiment, the horizontal distance between the centers of two adjacent blade disc assemblies 13 is L1, and the distance between the centers of two non-adjacent blade disc assemblies 13 is L2, and the ratio of L1 / L2 is between 0.4 and 0.8. Specifically, L1 / L2 is preferably 0.62. By setting the ratio of L1 / L2, blade interference can be avoided, thereby avoiding damage to the blades caused by adjacent blades cutting each other during mowing, and the cutting tracks of the second cutting blade layers of the front and rear blade disc assemblies are provided with a certain overlapping cutting area in the cutting width direction, which can avoid the problem of uncut grass between the front and rear blade disc assemblies.

[0096] The distance between the second cutting blade layer of the cutter head assembly 13 located in front of the mower in the direction of travel and the front end of the cutting deck 11 is L3, L3>a*V, a is determined based on the grass lifting rate, and V is the walking speed of the mower. For example, at a certain grass lifting rate, a is 0.055, then L3 is greater than 0.055V.

[0097] The horizontal distance between the second cutting blade layer of the cutter disc assembly 13 located behind the direction of travel of the mower and the side edge of the cutting deck 11 along the direction of the mower is L4. The values ​​of L4 and L3 may be the same or different and can be set according to actual needs. Moreover, L4>a*V, where a is determined based on the grass lifting rate and V is the walking speed of the mower.

[0098] In the blade assembly 13 of the multi-layer blade structure, the blade 134 is usually a blade without flange. When the blade rotates, there is no rising airflow. Therefore, the grass that is pressed down can only be cut if it stands upright completely by its own elasticity. Therefore, L3 needs to be large enough, otherwise the blade will pass through before the grass that is pressed down bounces up, which will cause the grass to not be cut or only partially cut, that is, to be missed. Through experiments, when the walking speed V of a lawn mower is 2m / s, there are missed cuts when L3 is 70mm, and there are no missed cuts when L3 is 110mm, 150mm, and 190mm. It can be seen that when the walking speed V is 2m / s, L3 must reach 110mm, so the time for the grass to be lifted is about 110 / 2000mm / s=0.055s. It can be inferred that L3 is greater than 0.055V. When the walking speed V is larger, L3 also needs to be larger.

[0099] The width of the cutting deck 11 is L5, and the value range of L5 is 850 mm to 1060 mm. The width L5 of the cutting deck 11 is the dimension of the cutting deck 11 in a direction perpendicular to the travel direction F. In this way, the cutting effect can be provided as much as possible while ensuring that the lawn mower can smoothly enter and exit the house. Specifically, L5 is preferably 950 mm.

[0100] In this embodiment, the lawn mower may be a push lawn mower or a ride-on lawn mower. Of course, the lawn mower may also be an automatic lawn mowing robot.

[0101] It should be noted that the various embodiments in this specification are described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the various embodiments can be referenced to each other.

[0102] The above is only a specific embodiment of the present disclosure, but the protection scope of the present disclosure is not limited thereto. Any changes or substitutions that can be easily thought of by a person skilled in the art within the technical scope disclosed in the present disclosure should be included in the protection scope of the present disclosure. Therefore, the protection scope of the present disclosure shall be subject to the attached claims.

Claims

1. A lawn mower, characterized in that: Comprising: Frame; Cutting deck, connected to the bottom of the frame and horizontally arranged relative to the ground; At least one cutting device, connected to the cutting deck, including a motor and a cutter head assembly connected to the output shaft of the motor and used for cutting, the cutter head assembly being received in the accommodation space formed by the cutting deck; Wherein, the plane where the cutting track formed by the blades of the cutter head assembly is inclined relative to the plane where the cutting deck is located.

2. The lawn mower according to claim 1, characterized in that The cutter head assembly includes at least two layers of blades arranged along the extension direction of the output shaft, and the inclination angle of the plane where the cutting track of each layer of blades is located relative to the plane where the cutting deck is located is the same.

3. The lawn mower according to claim 1, characterized in that: There is a height difference A1 between the lowest point and the highest point of the cutting track formed by at least one blade of the cutter head assembly, and the value range of the height difference A1 is: 4mm < A1 < 15mm, wherein the lowest point is in the forward direction of the mower travel direction, and the highest point is in the backward direction of the mower travel direction.

4. The lawn mower according to claim 1, characterized in that The cutting deck includes a top plate arranged parallel to the horizontal plane and a plurality of side plates connected to the top plate, the top plate and the side plates enclose to form the accommodation space, the motor is installed on the top plate, and the output shaft of the motor is perpendicular to the plane where the cutting track formed by the blades of the cutter head assembly is located.

5. The lawn mower according to claim 4, characterized in that The top plate includes a support surface inclined relative to the plane where the top plate is located, and the motor is installed on the support surface so that the plane where the cutting track formed by the blades of the cutter head assembly is inclined relative to the plane where the cutting deck is located.

6. The lawn mower according to claim 4, characterized in that The top plate includes a support surface arranged parallel to the plane where the top plate is located, the motor is installed on the support surface, and a gasket is arranged between the motor and the support surface so that the plane where the cutting track formed by the blades of the cutter head assembly is inclined relative to the plane where the cutting deck is located.

7. The lawn mower according to claim 4, characterized in that The top plate includes at least one support surface arranged parallel to the plane where the top plate is located, the motor is installed on the support surface, and the surface of the motor in contact with the support surface is an inclined surface so that the plane where the cutting track formed by the blades of the cutter head assembly is inclined relative to the plane where the cutting deck is located.

8. A lawn mower, characterized in that: Comprising: Frame; Cutting deck, connected to the bottom of the frame and horizontally arranged relative to the ground; At least one cutting device, connected to the cutting deck, including a motor and a cutter head assembly connected to the output shaft of the motor and used for cutting, the cutter head assembly being received in the accommodation space formed by the cutting deck; Wherein, the cutter head assembly is horizontally arranged relative to the ground, and the output shaft is inclined relative to the horizontal plane.

9. A lawn mower, characterized in that: Comprising: Frame; Cutting deck, connected to the bottom of the frame; At least one cutting device, connected to the cutting deck, including a motor and a cutter head assembly connected to the output shaft of the motor and used for cutting, the cutter head assembly being received in the accommodation space formed by the cutting deck, the cutter head assembly including at least two layers of blades arranged along the extension direction of the output shaft; The plane where the cutting track formed by the blades is inclined relative to the horizontal plane.

10. A lawn mower, characterized in that: Comprising: Frame; Cutting deck, connected to the bottom of the frame; At least three cutting devices arranged in a front-to-back manner and connected to the cutting deck, including a motor and a cutter disc assembly connected to the output shaft of the motor and used for cutting, wherein the cutter disc assembly includes at least two layers of blades arranged along the extension direction of the output shaft; the layer with the largest diameter of the cutting track is the first cutting blade layer, and one or more layers with a smaller diameter of the cutting track than the first cutting blade layer are the second cutting blade layer; There is a gap between the outer edges of the cutting tracks of the first cutting blade layers of two adjacent cutter disc assemblies, and the cutting tracks of the second cutting blade layers of two adjacent cutter disc assemblies at least partially overlap in the cutting width direction, and the cutting width direction is perpendicular to the moving direction of the lawn mower.

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