Lawn mower

Abstract

The utility model provides a mowing machine. The mowing machine comprises a machine body; the moving module drives the mower to move; the cutterhead is provided with at least one blade, the cutterhead is driven by the cutting motor to rotate so as to drive the blade to rotate, and the blade comprises a blade body used for being connected with the cutterhead and a cutting part connected with the blade body and used for executing mowing work; when the walking speed is larger than or equal to 1 m / s and the linear speed of the blade is larger than or equal to 30 m / s and smaller than or equal to 70 m / s, the hardness of the blade body ranges from 5 HRC to 45 HRC. When the walking speed and the linear speed of the mower are increased, but the thickness of the blade cannot be too large, and the extending length of the blade cannot be too small, the risk of blade breakage is reduced by reducing the hardness of the blade main body.

Description

Technical Field

[0001] The present disclosure relates to the technical field of gardening equipment and tools, and in particular to a lawn mower. Background Art

[0002] With the advancement of technology and the development of society, more and more power tools have entered people's lives, replacing people to complete many tasks, thereby reducing people's burden and bringing great convenience. Power tools usually include a blade mounted on a drive shaft, which drives the blade to rotate and perform cutting work.

[0003] However, currently, power tools such as lawn mowers have a problem of blades breaking when the blades hit hard objects such as stones. Utility Model Content

[0004] In view of this, an object of the present disclosure is to provide a lawn mower, one of the objects of which is to improve the problem of blade breakage of the lawn mower.

[0005] Based on the above-mentioned purpose, the present disclosure provides a lawn mower, comprising: a body; a moving module, driving the lawn mower to move; a cutter disc, wherein the cutter disc has at least one blade, and the cutter disc rotates under the drive of a cutting motor, thereby driving the blade to rotate, and the blade comprises: a blade body for connecting to the cutter disc, and a cutting portion connected to the blade body for performing mowing work; when the walking speed is greater than or equal to 1m / s and the linear speed of the blade is greater than or equal to 30m / s and less than or equal to 70m / s, the hardness of the blade body is in the range of 5-45HRC.

[0006] In an optional embodiment, when the walking speed is greater than or equal to 1.5 m / s and the linear speed of the blade is greater than or equal to 30 m / s and less than or equal to 70 m / s, the hardness of the blade body is in the range of 5-45 HRC.

[0007] In an optional embodiment, when the walking speed is greater than or equal to 2 m / s and the linear speed of the blade is greater than or equal to 30 m / s and less than or equal to 70 m / s, the hardness of the blade body is in the range of 5-45 HRC.

[0008] In an optional embodiment, when the walking speed is greater than or equal to 1 m / s and the linear speed of the blade is greater than or equal to 40 m / s and less than or equal to 60 m / s, the hardness of the blade body is in the range of 10-30 HRC.

[0009] In an optional embodiment, when the walking speed is greater than or equal to 1.5 m / s and the linear speed of the blade is greater than or equal to 40 m / s and less than or equal to 60 m / s, the hardness of the blade body is in the range of 10-30 HRC.

[0010] In an optional embodiment, when the walking speed is greater than or equal to 2 m / s and the linear speed of the blade is greater than or equal to 40 m / s and less than or equal to 60 m / s, the hardness of the blade body is in the range of 10-30 HRC.

[0011] In an optional embodiment, when the walking speed is greater than or equal to 1 m / s and the linear speed of the blade is greater than or equal to 40 m / s and less than or equal to 60 m / s, the hardness of the blade body is in the range of 10-25 HRC.

[0012] In an optional embodiment, when the walking speed is greater than or equal to 1.5 m / s and the linear speed of the blade is greater than or equal to 40 m / s and less than or equal to 60 m / s, the hardness of the blade body is in the range of 10-25 HRC.

[0013] In an optional embodiment, when the walking speed is greater than or equal to 2 m / s and the linear speed of the blade is greater than or equal to 40 m / s and less than or equal to 60 m / s, the hardness of the blade body is in the range of 10-25 HRC.

[0014] In an optional embodiment, the hardness of the cutting portion is greater than or equal to 50HRC.

[0015] In an optional embodiment, the hardness of the cutting portion is greater than or equal to 60HRC.

[0016] In an optional embodiment, the hardness of the cutting portion is less than or equal to 80HRC.

[0017] In an optional embodiment, the hardness of the cutting portion is in the range of 60-70 HRC.

[0018] In an optional embodiment, the length of the blade extending from the cutter disc is greater than or equal to 5 mm.

[0019] In an optional embodiment, the length of the blade extending from the cutter disc is 5-70 mm.

[0020] In an optional embodiment, the length of the blade extending from the cutter disc is 30-70 mm.

[0021] In an optional embodiment, the thickness of the blade is less than or equal to 5 mm.

[0022] In an optional embodiment, the thickness of the blade is 0.5-2 mm.

[0023] In an optional embodiment, the width of the cutting portion is 0.1-5 mm.

[0024] In an optional embodiment, the number of the blades is 3-6.

[0025] In an optional embodiment, a shaft mounting hole for mounting a shaft is provided at one end of the blade body, and the hardness of the shaft is greater than the hardness of the blade body.

[0026] In an optional embodiment, a de-edging area for holding the blade body is further included, and the de-edging area is provided on one end of the blade body close to the shaft mounting hole.

[0027] From the above description, it can be seen that the lawn mower provided by the present disclosure reduces the risk of blade breakage by reducing the hardness of the blade body or improving the hardness of the blade body and the cutting part at the same time when the walking speed increases and the linear speed increases, but the blade thickness cannot be too thick and the length of the blade extending out of the cutter disc cannot be too short. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] In order to more clearly illustrate the technical solutions in the present disclosure or related technologies, the following briefly introduces the drawings required for use in the embodiments or related technical descriptions. Obviously, the drawings described below are only embodiments of the present disclosure. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0029] Figure 1 is a front view of a blade in an embodiment of the present disclosure;

[0030] Figure 2 for Figure 1 Schematic diagram of the cross-sectional structure of the AA part;

[0031] Figure 3 for Figure 2 Schematic diagram of the enlarged structure of part B;

[0032] Figure 4 A schematic structural diagram of different hardness areas of the blade body and cutting portion in one embodiment of the present disclosure;

[0033] Figure 5 This is a structural diagram of a lawn mower according to an embodiment of the present disclosure;

[0034] Figure 6 Schematic diagram of blade thickness M in one embodiment of the present disclosure;

[0035] Figure 7 This is a schematic diagram of the structure of the cutter disc in one embodiment of the present disclosure, in which three blades are schematically shown. DETAILED DESCRIPTION

[0036] In order to make the objectives, technical solutions and advantages of the present disclosure more clearly understood, the present disclosure is further described in detail below in conjunction with specific embodiments and with reference to the accompanying drawings.

[0037] It should be noted that, unless otherwise defined, the technical terms or scientific terms used in the embodiments of the present disclosure should have the usual meanings understood by people with ordinary skills in the field to which the present disclosure belongs. The "first", "second" and similar words used in the embodiments of the present disclosure do not indicate any order, quantity or importance, but are only used to distinguish different components. "Include" or "comprise" and similar words mean that the elements or objects appearing before the word include the elements or objects listed after the word and their equivalents, without excluding other elements or objects. "Connect" or "connected" and similar words are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect. "Up", "down", "left", "right" and the like are only used to indicate relative position relationships. When the absolute position of the described object changes, the relative position relationship may also change accordingly.

[0038] Here is a brief overview of lawn mowers:

[0039] Reference Figures 1 to 7 The lawn mower includes: a body, a moving module, a cutting module, and a control module; the moving module and the cutting module are electrically connected to the control module respectively. The moving module is installed on the body and is configured to drive the lawn mower to move, for example, to drive the automatic lawn mower to move within the working area; specifically, the moving module includes a walking wheel and a driving motor for driving the walking wheel to move, and the output end of the driving motor is connected to the walking wheel. The cutting module is installed on the body and is configured to perform mowing tasks within the working area, for example, to cut grass in a lawn to be cut. Specifically, the cutting module includes a cutter disc and a cutting motor for driving the cutter disc to rotate. The cutter disc is provided with at least one blade. The cutter disc rotates under the drive of the cutting motor, thereby driving the blade thereon to cut the grass. The control module is installed in the body and is used to control the moving module to drive the automatic lawn mower to move, and to control the cutting module to perform cutting tasks.

[0040] Power tools such as lawn mowers may break their blades when they hit hard objects such as stones.

[0041] In order to reduce the risk of blade breakage, the first approach is to increase the thickness of the blade. However, considering that it is difficult to manufacture a blade that is too thick, the thickness of the blade should not be too thick.

[0042] It should be noted that the thicker the blade, the harder the blade body can be, but the existing technology cannot make the blade thickness too thick.

[0043] In order to reduce the risk of blade breakage, the second aspect is to shorten the effective length of the blade. However, considering that the effective length of the blade is too short, the grass will not be cut. Therefore, the effective length of the blade should not be too short.

[0044] In other words, the shorter the length of the blade extending from the cutter disc, the less likely it is to break. However, if the length of the blade extending from the cutter disc is too short, the grass cannot be cut and the cutting quality is reduced.

[0045] As consumers have increasingly demanding requirements for lawn mowers, such as higher cutting efficiency, cutting efficiency is related to the travel speed of the lawn mower. In other words, the travel speed of the lawn mower affects cutting efficiency. Therefore, in order to improve cutting efficiency, in some embodiments, the travel speed can be improved, for example, by increasing the travel speed to achieve higher cutting efficiency. In some embodiments, the travel speed is greater than or equal to 0.8 m / s; in some embodiments, the travel speed is greater than or equal to 1 m / s; further, the travel speed is greater than or equal to 1.5 m / s; and further, the travel speed is greater than or equal to 2 m / s.

[0046] Generally speaking, the faster the walking speed, the faster the linear speed of the blade should be; the reason is that if the linear speed before the walking speed is increased is used, the original cutting quality (or cutting effect) cannot be achieved for the same piece of lawn. Therefore, in order to improve the cutting quality, the linear speed needs to be adaptively increased. In other words, as the walking speed increases, the linear speed needs to be adaptively increased to meet the cutting quality requirements. That is, the linear speed is related to the walking speed. In some embodiments, the linear speed can be increased to adapt to a faster moving speed. For example, when the walking speed is greater than or equal to 0.8 m / s, especially when the walking speed is greater than or equal to 1 m / s, the linear speed of the blade is greater than or equal to 30 m / s; for example, when the walking speed is greater than or equal to 1 m / s, the linear speed of the blade is greater than or equal to 34 m / s. For another example, when the walking speed is greater than or equal to 1.5 m / s, the linear speed of the blade is greater than or equal to 40 m / s.

[0047] Considering that an excessively high linear speed will cause the blade to easily hit a hard object and increase the risk of breaking, in some embodiments, the linear speed of the blade is less than or equal to 70 m / s. Furthermore, the linear speed of the blade is less than or equal to 60 m / s. Furthermore, the linear speed is less than or equal to 50 m / s. Therefore, in some embodiments, when the walking speed is greater than or equal to 0.8 m / s, the linear speed of the blade is greater than or equal to 30 m / s and less than or equal to 70 m / s; for example, when the walking speed is equal to 1 m / s, the linear speed of the blade is in the range of 34-35 m / s.

[0048] In some embodiments, when the traveling speed is greater than or equal to 1 m / s, the linear speed of the blade is greater than or equal to 30 m / s. For example, when the traveling speed is equal to 1 m / s, the linear speed of the blade is in the range of 34-35 m / s.

[0049] In some embodiments, when the travel speed is greater than or equal to 1 m / s, the linear speed of the blade is greater than or equal to 34 m / s and less than or equal to 60 m / s. For example, when the travel speed is equal to 1 m / s, the linear speed of the blade is 38 m / s.

[0050] In some embodiments, when the travel speed is greater than or equal to 1.5 m / s, the linear speed of the blade is greater than or equal to 40 m / s and less than or equal to 60 m / s. For example, when the travel speed is 2 m / s, the linear speed of the blade is 44 m / s-45 m / s; for another example, when the travel speed is 2 m / s, the linear speed of the blade is 49 m / s-50 m / s.

[0051] In some embodiments, when the travel speed is greater than or equal to 2 m / s, the linear speed of the blade is greater than or equal to 40 m / s and less than or equal to 50 m / s. For example, when the travel speed is 2 m / s, the linear speed of the blade is 44 m / s-45 m / s; for another example, when the travel speed is 2 m / s, the linear speed of the blade is 49 m / s-50 m / s.

[0052] Considering that the risk of blade breakage increases with increasing linear speed, the blade hardness can be improved to reduce this risk. Specifically, improving the blade hardness can mitigate the risk of blade breakage associated with increased linear speed. This is particularly applicable to lawn mowers that address the issues of the first and second aspects above by improving the hardness of the blade, such as the blade body, to reduce the risk of blade breakage.

[0053] In some embodiments, when the linear speed of the blade is greater than or equal to a set value, wherein the set value is 30 m / s, the hardness of the blade body can be softened by improving the hardness of the blade body. For example, when the linear speed of the blade is greater than or equal to 30 m / s, the hardness of the blade body is controlled to be below 45 HRC; that is, the hardness of the blade body is less than or equal to 45 HRC. Furthermore, when the linear speed of the blade is greater than or equal to 30 m / s, the hardness of the blade body is less than or equal to 30 HRC. Furthermore, when the linear speed of the blade is greater than or equal to 30 m / s, the hardness of the blade body is less than or equal to 25 HRC.

[0054] Considering that the blade body is prone to bending if its hardness is too low, the hardness of the blade body should not be too low. In some embodiments, when the linear speed of the blade is greater than or equal to 30 m / s, the hardness of the blade body is greater than or equal to 5 HRC. Furthermore, when the linear speed of the blade is greater than or equal to 30 m / s, the hardness of the blade body is greater than or equal to 10 HRC.

[0055] As can be seen from the above, in some embodiments, when the linear speed of the blade is greater than or equal to 30 m / s, the hardness of the blade body is greater than or equal to 5 HRC and less than or equal to 45 HRC.

[0056] In some embodiments, when the linear speed of the blade is greater than or equal to 30 m / s, the hardness of the blade body is greater than or equal to 10 HRC and less than or equal to 30 HRC. For example, when the linear speed of the blade is greater than or equal to 40 m / s, the hardness of the blade body is in the range of 10-30 HRC.

[0057] In some embodiments, when the linear speed of the blade is greater than or equal to 30 m / s, the hardness of the blade body is greater than or equal to 10 HRC and less than or equal to 25 HRC. For example, when the linear speed of the blade is greater than or equal to 40 m / s, the hardness of the blade body is in the range of 10-25 HRC.

[0058] Considering that excessively high linear speeds may increase the risk of the blades colliding with hard objects and breaking, in some embodiments, the linear speed of the blades is less than or equal to 70 m / s. Furthermore, the linear speed of the blades is less than or equal to 60 m / s. Even more preferably, the linear speed is less than or equal to 50 m / s.

[0059] Therefore, in some embodiments, when the linear speed of the blade is greater than or equal to 30 m / s and less than or equal to 70 m / s, the hardness of the blade body is greater than or equal to 5 HRC and less than or equal to 45 HRC. For example, when the linear speed of the blade is 34-35 m / s, the hardness of the blade body is 40 HRC.

[0060] In some embodiments, when the linear speed of the blade is greater than or equal to 40 m / s and less than or equal to 60 m / s, the hardness of the blade body is greater than or equal to 10 HRC and less than or equal to 30 HRC. For example, when the linear speed of the blade is equal to 44 m / s-45 m / s, the hardness of the blade body is 20-30 HRC. For another example, when the linear speed of the blade is equal to 49 m / s-50 m / s, the hardness of the blade body is 10-20 HRC.

[0061] In some embodiments, when the linear speed of the blade is greater than or equal to 40 m / s and less than or equal to 60 m / s, the hardness of the blade body is greater than or equal to HRC and less than or equal to 25 HRC. For example, when the linear speed of the blade is equal to 49 m / s-50 m / s, the hardness of the blade body is 10-20 HRC.

[0062] In some embodiments, when the linear speed of the blade is greater than or equal to 40 m / s and less than or equal to 50 m / s, the hardness of the blade body is greater than or equal to HRC and less than or equal to 25 HRC. For example, when the linear speed of the blade is equal to 49 m / s-50 m / s, the hardness of the blade body is 10-20 HRC.

[0063] Considering that the hardness of the cutting part is too low and not wear-resistant, and the hardness of the cutting part is too high, it is limited by the process materials. In other words, the greater the hardness of the cutting part, the more wear-resistant it is, but the current process cannot achieve a very high level. In summary, in order to make the cutting part meet the wear resistance requirements, therefore, in some embodiments, the hardness of the cutting part can be improved to meet the wear resistance requirements. For example, when the linear speed of the blade is greater than or equal to 30m / s, the hardness of the cutting part is greater than or equal to 50HRC; further, when the linear speed of the blade is greater than or equal to 30m / s, the hardness of the cutting part is greater than or equal to 55HRC; for example, when the linear speed of the blade is greater than or equal to 34m / s, the hardness of the cutting part is greater than or equal to 55HRC. Furthermore, when the linear speed of the blade is greater than or equal to 30m / s, the hardness of the cutting part is greater than or equal to 60HRC. For example, when the linear speed of the blade is greater than or equal to 40m / s, the hardness of the cutting part is greater than or equal to 60HRC.

[0064] Taking into account current process limitations, the hardness of the cutting portion cannot be made very high. Therefore, in some embodiments, when the linear speed of the blade is greater than or equal to 30 m / s, the hardness of the cutting portion is less than or equal to 80 HRC. Furthermore, when the linear speed of the blade is greater than or equal to 30 m / s, the hardness of the cutting portion is less than or equal to 75 HRC. For example, when the linear speed of the blade is greater than or equal to 34 m / s, the hardness of the cutting portion is less than or equal to 75 HRC. Furthermore, when the linear speed of the blade is greater than or equal to 30 m / s, the hardness of the cutting portion is less than or equal to 70 HRC. For example, when the linear speed of the blade is greater than or equal to 40 m / s, the hardness of the cutting portion is less than or equal to 70 HRC.

[0065] From the above, it can be seen that in some embodiments, when the linear speed of the blade is greater than or equal to 30 m / s, the hardness of the cutting portion is greater than or equal to 50 HRC and less than or equal to 80 HRC.

[0066] In some embodiments, when the linear speed of the blade is greater than or equal to 30 m / s, the hardness of the cutting portion is greater than or equal to 55 HRC and less than or equal to 75 HRC.

[0067] In some embodiments, when the linear speed of the blade is greater than or equal to 30 m / s, the hardness of the cutting portion is greater than or equal to 60 HRC and less than or equal to 70 HRC.

[0068] Considering that excessively high linear speeds may increase the risk of the blades colliding with hard objects and breaking, in some embodiments, the linear speed of the blades is less than or equal to 70 m / s. Furthermore, the linear speed of the blades is less than or equal to 60 m / s. Even more preferably, the linear speed is less than or equal to 50 m / s.

[0069] In some embodiments, when the linear speed of the blade is greater than or equal to 30 m / s and less than or equal to 70 m / s, the hardness of the cutting portion is greater than or equal to 50 HRC.

[0070] In some embodiments, when the linear speed of the blade is greater than or equal to 40 m / s and less than or equal to 60 m / s, the hardness of the cutting portion is greater than or equal to 55 HRC.

[0071] In some embodiments, when the linear speed of the blade is greater than or equal to 40 m / s and less than or equal to 50 m / s, the hardness of the cutting portion is greater than or equal to 60 HRC.

[0072] In summary, in some embodiments, when the linear speed of the blade is greater than or equal to 30 m / s and less than or equal to 70 m / s, the hardness of the cutting portion is greater than or equal to HRC and less than or equal to 80 HRC. For example, when the linear speed of the blade is 34-35 m / s, the hardness of the blade body is 60-70 HRC.

[0073] In some embodiments, when the linear speed of the blade is greater than or equal to 40 m / s and less than or equal to 60 m / s, the hardness of the cutting portion is greater than or equal to 55 HRC and less than or equal to 75 HRC. For example, when the linear speed of the blade is equal to 44 m / s-45 m / s, the hardness of the cutting portion is 60-70 HRC. For another example, when the linear speed of the blade is equal to 49 m / s-50 m / s, the hardness of the cutting portion is 60-70 HRC.

[0074] In some embodiments, when the linear speed of the blade is greater than or equal to 40 m / s and less than or equal to 50 m / s, the hardness of the cutting portion is greater than or equal to HRC and less than or equal to 70 HRC. For example, when the linear speed of the blade is equal to 44 m / s-45 m / s, the hardness of the cutting portion is 60-70 HRC. For another example, when the linear speed of the blade is equal to 49 m / s-50 m / s, the hardness of the cutting portion is 60-70 HRC.

[0075] In some embodiments, in order to meet the toughness requirements of the blade body and the wear resistance requirements of the cutting portion, the hardness of the blade body and the cutting portion can be improved; for example, when the linear speed of the blade is greater than or equal to 30 m / s, the hardness of the blade body is 5-45 HRC, and the hardness of the cutting portion is 50 or above. For another example, when the linear speed of the blade is greater than or equal to 30 m / s, the hardness of the blade body is 10-30 HRC, and the hardness of the cutting portion is 55 or above. For another example, when the linear speed of the blade is greater than or equal to 30 m / s, the hardness of the blade body is 10-25 HRC, and the hardness of the cutting portion is 60 or above.

[0076] Considering current process limitations, the hardness of the cutting portion cannot be increased. Therefore, in some embodiments, for example, when the linear speed of the blade is greater than or equal to 30 m / s, the hardness of the blade body is 5-45 HRC, and the hardness of the cutting portion is 50-80 HRC. For another example, when the linear speed of the blade is greater than or equal to 30 m / s, the hardness of the blade body is 10-30 HRC, and the hardness of the cutting portion is 55-75 HRC. For another example, when the linear speed of the blade is greater than or equal to 30 m / s, the hardness of the blade body is 10-25 HRC, and the hardness of the cutting portion is 60-70 HRC.

[0077] Considering that excessive linear speeds can increase the risk of the blade colliding with hard objects and causing breakage, in some embodiments, for example, when the linear speed of the blade is greater than or equal to 30 m / s and less than or equal to 70 m / s, the hardness of the blade body is 5-45 HRC, and the hardness of the cutting portion is 50-80 HRC. When the linear speed of the blade is greater than or equal to 30 m / s and less than or equal to 70 m / s, the hardness of the blade body is 10-30 HRC, and the hardness of the cutting portion is 55-75 HRC. For another example, when the linear speed of the blade is greater than or equal to 30 m / s and less than or equal to 70 m / s, the hardness of the blade body is 10-25 HRC, and the hardness of the cutting portion is 60-70 HRC.

[0078] In summary, in some embodiments, when the linear speed of the blade is greater than or equal to 30 m / s and less than or equal to 70 m / s, the hardness of the blade body is greater than or equal to 5 HRC and less than or equal to 45 HRC; and the hardness of the cutting portion is greater than or equal to 50 HRC and less than or equal to 80 HRC. For example, when the linear speed of the blade is 34-35 m / s, the hardness of the blade body is 40 HRC, and the hardness of the blade body is 60-70 HRC.

[0079] In some embodiments, when the linear speed of the blade is greater than or equal to 40 m / s and less than or equal to 60 m / s, the hardness of the blade body is greater than or equal to 10 HRC and less than or equal to 30 HRC, and the hardness of the cutting portion is greater than or equal to 55 HRC and less than or equal to 75 HRC. For example, when the linear speed of the blade is between 44 m / s and 45 m / s, the hardness of the blade body is between 20 and 30 HRC, and the hardness of the cutting portion is between 60 and 70 HRC. For another example, when the linear speed of the blade is between 49 m / s and 50 m / s, the hardness of the cutting portion is between 60 and 70 HRC.

[0080] In some embodiments, when the linear speed of the blade is greater than or equal to 40 m / s and less than or equal to 50 m / s, the hardness of the blade body is greater than or equal to 10 HRC and less than or equal to 25 HRC, and the hardness of the cutting portion is greater than or equal to 60 HRC and less than or equal to 70 HRC. For example, when the linear speed of the blade is between 49 m / s and 50 m / s, the hardness of the blade body is between 10 and 20 HRC, and the hardness of the cutting portion is between 60 and 70 HRC.

[0081] Considering that the lawn mower can use multi-layer blades, the multi-layer blades are usually arranged in a staggered manner, and the cutting radius (or cutting diameter) of blades in different layers is different, and the linear speed is related to the cutting radius (or cutting diameter) of the blade. Generally speaking, the multi-layer blades are usually arranged in a stepped manner. The more blade layers there are, the higher the linear speed of the blades. In other words, the linear speed of the blades is related to the number of blade layers, and the linear speed of the blades affects the cutting quality. Therefore, the lawn mower using multi-layer blades has higher requirements for cutting efficiency and quality. In order to adapt to the cutting requirements of multi-layer blades, in some embodiments, the (minimum) linear speed of the multi-layer blades is greater than the linear speed of the single-layer blades. In particular, for the same walking speed, the linear speed of the lawn mower using multi-layer blades is greater than the linear speed when the lawn mower uses single-layer blades.

[0082] Therefore, in some embodiments, when the travel speed is 2 m / s, for a lawn mower with a single blade, the linear speed of the blade is 44 m / s-45 m / s; when the travel speed is 2 m / s, for a lawn mower with a multi-blade, the linear speed of the blade is 49 m / s-50 m / s.

[0083] It is understandable that if Figure 5 As shown, when there are multiple layers of blades, the diameter of the cutting track of the blade gradually decreases from top to bottom along the height direction of the lawn mower. Therefore, the linear speed of the blade gradually decreases. In other words, the diameter of the cutting track of the upper blade is greater than the diameter of the cutting track of the lower blade. Therefore, the linear speed of the upper blade is greater than the linear speed of the lower blade. Among them, for multiple layers of blades, the linear speed of the blade refers to the linear speed of the lowest blade or the smallest linear speed.

[0084] Considering that the multiple layers of blades may be arranged in a staggered manner, the linear speed of each layer is different. In some embodiments, in order to reduce the risk of blade breakage, the hardness of the blade (main body) with a high linear speed is less than the hardness of the blade (main body) with a low linear speed. For example, Figure 5 The multi-layer blades are distributed in a stepped manner. From bottom to top, the linear speed of the blade increases successively. Therefore, from bottom to top, the hardness of the blade body decreases successively to reduce the risk of blade breakage.

[0085] Considering that the blade is mounted on the cutterhead, the length of the blade extending from the cutterhead (referred to as the effective length of the blade) affects the quality of mowing. In other words, to improve mowing quality, the effective length of the blade can be increased. Since a blade with an effective length that is too short cannot mow the grass, the mowing quality is reduced or the mowing effect is poor. Therefore, the effective length of the blade cannot be too short. For example, in some embodiments, the effective length of the blade is greater than or equal to 5 mm. Considering that some larger mowers, such as commercial mowers, have high requirements for cutting efficiency and cutting quality, the effective length of the blade is required to be even higher. Therefore, in some embodiments, the effective length of the blade is greater than or equal to 30 mm.

[0086] It is understandable that since larger lawn mowers, such as commercial lawn mowers, have higher cutting efficiency requirements, the walking speed of commercial lawn mowers will be relatively faster than that of small lawn mowers, such as smart lawn mowers.

[0087] Considering that the length of the blade extending from the cutter disc (referred to as the effective length of the blade) is too long and is prone to breakage, the effective length of the blade cannot be too long. For example, in some embodiments, the effective length of the blade is less than or equal to 70 mm.

[0088] In summary, in some embodiments, the effective length of the blade is greater than or equal to 5 mm and less than or equal to 70 mm. Further, the effective length of the blade is greater than or equal to 30 mm and less than or equal to 70 mm.

[0089] To accommodate the increased risk of blade breakage associated with longer blades (such as those in lawn mowers with high cutting efficiency and quality requirements), in some embodiments, the blade's main body hardness should be softer. For example, the main body hardness of a blade with an effective length of 30 mm is lower than that of a blade with an effective length of 5 mm. In other words, the longer the effective length of the blade, the lower the main body hardness.

[0090] For example, in some embodiments, when the effective length of the blade is greater than or equal to 5 mm and less than or equal to 70 mm, the hardness of the blade body is greater than or equal to 10 HRC and less than or equal to 30 HRC. When the effective length of the blade is greater than or equal to 30 mm and less than or equal to 70 mm, the hardness of the blade body is greater than or equal to 10 HRC and less than or equal to 25 HRC.

[0091] Furthermore, considering the lawn mower having higher cutting quality requirements, the linear speed of the blade is relatively greater and / or the effective length of the blade is relatively greater.

[0092] Therefore, in some embodiments, when the linear speed of the blade is greater than or equal to 40 m / s and less than or equal to 60 m / s, the effective length of the blade is greater than or equal to 5 mm and less than or equal to 70 mm, and the hardness of the blade body is greater than or equal to 10 HRC and less than or equal to 30 HRC; and when the linear speed of the blade is greater than or equal to 40 m / s and less than or equal to 60 m / s, the effective length of the blade is greater than or equal to 30 mm and less than or equal to 70 mm, the hardness of the blade body is greater than or equal to 10 HRC and less than or equal to 25 HRC;

[0093] For example, when the linear speed of the blade is equal to 44m / s-45m / s, the effective length of the blade is equal to 15mm, and the hardness of the blade body is 20-30HRC. When the linear speed of the blade is equal to 49m / s-50m / s, the effective length of the blade is greater than 30mm, and the hardness of the blade body is 10-20HRC. For example, in one example, when the linear speed of the blade is equal to 49m / s-50m / s, the effective length of the blade is 50mm-60mm, and the hardness of the blade body is 10-20HRC. It should be noted that the effective length of the blade of 50mm-60mm covers multiple layers of blades, for example, the effective length of the bottom blade is 50mm, and the effective length of the top blade is 60mm.

[0094] It should be noted that in order to improve the quality or effect of mowing, multiple blades can be used, that is, the improvement of mowing quality can be achieved through multiple cutting. Therefore, in some embodiments, for the same effective blade length, the cutting quality of a mower using multiple blades is greater than that of a mower using a single blade. For example, the effective length of the blade is 5-6 mm, and further, the number of blades is selected to be 5-6 to improve the cutting quality. For another example, the effective length of the blade is 15 mm, and further, the number of blades is selected to be 5; for another example, the effective length of the blade is 50 mm-60 mm, and the blade is a multi-layer blade, for example, the number of blade layers is 3-5, the effective length of the bottom blade is 50 mm, and the effective length of the top blade is 60 mm, and further, the number of blades in each layer is selected to be 3-5.

[0095] It should be noted that, given that the blades are mounted on a cutterhead, their linear velocity is also related to their effective length. In other words, the effective length of the blades also affects the linear velocity. For example, at the same rotational speed, the longer the blade, the greater the linear velocity. Therefore, increasing the effective length of the blades can also be used to increase the linear velocity. Considering that a linear velocity that is too low will result in poor grass cutting, thus affecting cutting efficiency, the effective length of the blades should not be too short. In some embodiments, the effective length of the blades is greater than 5 mm. Considering that excessive linear velocity can easily cause the blades to break, the effective length of the blades should not be too long. In some embodiments, the effective length of the blades is 70 mm or less. Considering that larger lawn mowers, such as commercial lawn mowers, require higher cutting efficiency and quality, the effective length of the blades is higher and cannot be too short. Therefore, in some embodiments, the effective length of the blades is 30 mm or greater. It is understandable that the longer effective length leads to a relatively softer blade body.

[0096] In summary, in some embodiments, the effective length of the blade is greater than or equal to 5 mm and less than or equal to 70 mm. Furthermore, the effective length of the blade is greater than or equal to 30 mm and less than or equal to 70 mm. For example, the effective length of the blade is 5-6 mm, and further, the number of blades is selected to be 5-6 to improve the cutting quality. For another example, the effective length of the blade is 15 mm, and further, the number of blades can be selected to be 5 to improve the cutting quality. For another example, the effective length of the blade is 50 mm-60 mm. For example, the blade is a multi-layer blade, and the number of blade layers is 3-5. The effective length of the bottom blade is 50 mm, and the effective length of the top blade is 60 mm. Further, the number of blades in each layer is selected to be 3-5.

[0097] It should be noted that the overall length of the blade is equal to the sum of the effective length of the blade and the installed length of the blade. In some embodiments, the installed length of the blade is typically 10-15 mm. Therefore, the overall length of the blade is equal to the effective length of the blade plus (10-15) mm; where the installed length of the blade refers to the length of the blade when it is installed on the cutter head or when the blade cannot extend out of the cutter head.

[0098] Considering that a thick blade makes manufacturing more difficult, the blade should not be too thick. In some embodiments, the blade thickness is less than or equal to 5 mm. Furthermore, the blade thickness is less than or equal to 2 mm. Considering that a thin blade thickness also increases the risk of blade breakage, the blade should not be too thin. In some embodiments, the blade thickness is greater than or equal to 0.5 mm. Furthermore, the blade thickness is greater than or equal to 0.9 mm.

[0099] As can be seen from the above, the blade cannot be made too thin or too thick. Therefore, in some embodiments, the blade thickness is greater than or equal to 0.5 mm and less than or equal to 5 mm. Further, the blade thickness is greater than or equal to 0.5 mm and less than or equal to 2 mm. In some embodiments, the blade thickness is greater than or equal to 0.9 mm and less than or equal to 5 mm. Further, the blade thickness is greater than or equal to 0.9 mm and less than or equal to 2 mm.

[0100] In summary, for example, the blade thickness can be selected as 0.6mm, 0.9mm, 1.2mm, etc.

[0101] From the above, it can be seen that the present application provides a lawn mower that reduces the risk of blade breakage by reducing the hardness of the blade body or improving the hardness of the blade body and the cutting part at the same time when the walking speed increases and the linear speed increases, but the blade thickness cannot be too thick and the length of the blade extending from the cutter disc cannot be too short.

[0102] Lawn mowers, especially commercial lawn mowers, have high travel speeds and high linear speeds, but the blade thickness cannot be too thick, and the length of the blade extending from the cutter disc cannot be too short; therefore, the blade body must be flexible. For example, a lawn mower with a travel speed greater than 0.8m / s; another example is a lawn mower with a travel speed greater than 1.5m / s and an effective blade length of 5-70mm;

[0103] Considering large lawn mowers with fast walking speed, higher cutting quality and efficiency, the blade thickness cannot be too thick, the length of the blade extending from the cutter disc cannot be too small, and the blade is longer than that of small machines; so the blade body is softer, for example, machines with a walking speed greater than 1.5m / S and a blade length of 30-70mm.

[0104] Based on the above discussion, referring to Table 1, the parameter ranges of the lawn mower provided in this application can be selected and combined from the following parameter ranges:

[0105] Parameter range of walking speed: Range A: greater than or equal to 1m / s; Range A1: greater than or equal to 1.5m / s; Range A2: greater than or equal to 2m / s; for example: 2m / s.

[0106] Parameter range of linear speed (m / s): Range B is 30-70m / s; Range B1 is 40-60m / s;

[0107] The parameter range of blade body hardness (HRC): Range E is 5-45; Range E1 is 10-30; Range E 2 is 10-25;

[0108] Furthermore, the hardness range of the blade cutting part (HRC) is: range F is greater than or equal to 50HRC; range F1 is greater than or equal to 60HRC

[0109] Furthermore, the parameter ranges of the effective length of the blade are: range C is greater than or equal to 5 mm; range C1 is 5-70 mm; range C2 is 30-70 mm;

[0110] Furthermore, the number of blades ranges from 3 to 5.

[0111] It should be noted that the hardness range E1 of the blade body is applicable to machines with a travel speed greater than 1.5 m / s and a blade length of 5-70 mm; the range E2 is applicable to machines with a travel speed greater than 1.5 m / s and a blade length of 30-70 mm.

[0112] Furthermore, the parameter ranges of the thickness of the blade are: range D is 0.5-5 mm; range D1 is 0.5-2 mm; range D2 is 0.9-5 mm; range D3 is 0.9-2 mm.

[0113] With reference to Table 1, the present disclosure provides four examples, namely, a lawn mower of a first example, a lawn mower of a second example, a lawn mower of a third example, and a lawn mower of a fourth example;

[0114] In the first example, the lawn mower parameters are: a travel speed greater than or equal to 1 m / s, for example, a travel speed of 1 m / s; a linear speed of approximately 34 m / s; a blade effective length of 15 mm, and a blade body hardness of 40 HRC;

[0115] Furthermore, the hardness of the cutting portion of the blade is 60-70HRC.

[0116] Furthermore, the thickness of the blade is 0.9 mm.

[0117] In the second example, the lawn mower parameters are: a travel speed greater than or equal to 1.5 m / s, for example, a travel speed of 2 m / s; a linear speed of approximately 44 m / s; a blade effective length of 15 mm, and a blade body hardness of 20-30 HRC;

[0118] Furthermore, the hardness of the cutting portion of the blade is 60-70HRC.

[0119] Furthermore, the thickness of the blade is 0.9 mm.

[0120] Furthermore, the number of blades is 5 to improve cutting quality.

[0121] In the third example, the lawn mower parameters are: a travel speed greater than or equal to 1.5 m / s, for example, a travel speed of 2 m / s; a linear speed of approximately 48 m / s; a blade effective length of 50-60 mm, and a blade body hardness of 10-20 HRC;

[0122] Furthermore, the hardness of the cutting portion of the blade is 60-70HRC.

[0123] Furthermore, the thickness of the blade is 1.2 mm.

[0124] Furthermore, the blade is a multi-layer blade, the effective length of the blade of the bottom layer is 50 mm, and the effective length of the blade of the top layer is 60 mm;

[0125] Furthermore, the number of blades in each layer is 3 to improve cutting quality.

[0126] In the fourth example, the lawn mower parameters are: a travel speed greater than or equal to 1 m / s, for example, a travel speed of 1 m / s; a linear speed of approximately 38 m / s; a blade effective length of 5 mm, and a blade body hardness of 40 HRC;

[0127] Furthermore, the hardness of the cutting portion of the blade is 60-70HRC.

[0128] Furthermore, the thickness of the blade is 0.6 mm.

[0129] Furthermore, the number of blades is 5 to improve cutting quality.

[0130] It should be understood that when a parameter value is a range, it indicates that the parameter can be selected within the range.

[0131] Furthermore, the blade body has a first area, the cutting portion has a second area, and the area of the blade body is greater than the area of the cutting portion.

[0132] Furthermore, the blade body includes at least two regions of different hardness.

[0133] Furthermore, the cutting portion includes at least two regions with different hardness.

[0134] Furthermore, the number of regions with different hardness of the blade body is greater than the number of regions with different hardness of the cutting portion.

[0135] See Figure 4 In a preferred embodiment, the blade body 11 includes a first hardness region 112 and a second hardness region 113. The first hardness region 112 is located on the outside of the blade body 11, and the second hardness region 113 is located on the inside of the blade body 11. The hardness of the first hardness region 112 is greater than that of the second hardness region 113. The blade body 11 is configured with two hardness regions. The first hardness region 112 is set to be harder, which is conducive to its grass cutting performance. The second hardness region 113 is set to be less hard than the first hardness region 112. This helps the first hardness region 112 transfer the impact force when cutting grass to the second hardness region 113, helps the first hardness region 112 to absorb the force, and effectively prevents the blade 1 from breaking.

[0136] In one embodiment, the area of the first hardness region 112 is smaller than the area of the second hardness region 113. The smaller hardness region is set to a larger area to enhance the force dissipation effect of the harder region. In another embodiment, the area of the first hardness region 112 can also be set to be greater than or equal to the area of the second hardness region 113.

[0137] In another embodiment, the blade body 11 may include one or more other regions of varying hardness in addition to the first hardness region 112 and the second hardness region 113. Within a certain range, the more regions of varying hardness the blade body 11 has, the better the force dissipation effect on the blade 1. However, the more regions of varying hardness the blade body 11 has, the higher the production cost of the blade 1. Furthermore, different usage environments may require different numbers of regions of varying hardness for the blade 1. Therefore, the number of regions of varying hardness on the blade body 11 can be adjusted based on usage.

[0138] Please also see Figure 4 In a preferred embodiment, the cutting portion 12 includes a third hardness region 121 and a fourth hardness region 122. The third hardness region 121 is located outside the cutting portion 12, and the fourth hardness region 122 is located inside the cutting portion 12. The hardness of the third hardness region 121 is greater than that of the fourth hardness region 122. Setting the hardness of the fourth hardness region 122 to be lower than that of the third hardness region 121 facilitates transferring the impact force received by the third hardness region 121 to the fourth hardness region 122, helping the third hardness region 121 to dissipate the force, and effectively preventing the blade 1 from breaking.

[0139] In one embodiment, the area of the third hardness region 121 is smaller than that of the fourth hardness region 122. The smaller hardness region is larger, thereby enhancing the force dissipation effect of the harder region. In another embodiment, the area of the third hardness region 121 can be set to be greater than or equal to that of the fourth hardness region 122.

[0140] In another embodiment, the cutting portion 12 may further include one or more regions of varying hardness in addition to the third hardness region 121 and the fourth hardness region 122. Within a certain range, the more regions of varying hardness the cutting portion 12 comprises, the better the impact relief effect on the blade 1. However, the more regions of varying hardness the cutting portion 12 comprises, the higher the manufacturing cost of the blade 1. Different usage environments also require different numbers of hardness regions for the blade 1. Therefore, the number of regions of varying hardness on the cutting portion 12 can be adjusted based on usage.

[0141] In one embodiment, the number of regions of varying hardness on the blade body 11 is greater than the number of regions of varying hardness on the cutting portion 12. Generally, the area of the blade body 11 is larger than the area of the cutting portion 12, making it easier for the blade body 11 to have more regions of varying hardness than the cutting portion 12. The greater number of regions of varying hardness on the blade body 11 enhances the force dissipation effect of the blade 1.

[0142] In another embodiment, the number of regions of different hardness of the blade body 11 may be equal to or less than the number of regions of different hardness of the cutting portion 12 .

[0143] See also Figure 5 It should be understood that the outer side and inner side described in the present disclosure are based on the blade 1 as a whole, the setting direction toward the edge of the blade 1 is the outer side, and the setting direction toward the inside of the blade 1 is the inner side.

[0144] In one embodiment, the width of the cutting portion 12 can be in the range of [0.1 mm, 5 mm]. The width of the cutting portion 12 can be set as long as it meets the cutting requirements of the cutting portion 12 and ensures that the cutting portion 12 can be reliably connected to the blade body 11. This can significantly reduce the production cost of the blade 1 while ensuring the wear resistance of the blade 1. Specifically, the width of the cutting portion can be 0.1 mm, 1 mm, 2 mm, or 5 mm.

[0145] In one embodiment, the blade 1 is made of a whole piece of plate. By performing different degrees of hardening treatment on the blade body 11 and the cutting portion 12, such as laser quenching, edge carburizing or induction quenching, the blade body 11 and the cutting portion 12 are obtained, each having different hardness areas, so as to meet the high toughness requirements of the blade body 11 while meeting the high wear resistance requirements of the cutting portion 12.

[0146] In some embodiments, the blade 1 can be made from a single piece of plate material, and a tempering process can be performed to make the metal grains of the blade body 11 denser, thereby improving the impact resistance of the blade body 11. The cutting portion can be hardened by laser quenching the edge, thereby obtaining a blade 1 with a cutting portion harder than the blade body 11. Of course, in other embodiments, laser quenching can be replaced by other processes, such as edge carburizing, induction hardening, etc.

[0147] In another embodiment, the blade body 11 can be configured as a single unit with regions of varying hardness, and the cutting portion 12 can be configured as multiple components of varying hardness. The multiple components of the cutting portion 12 made of materials of varying hardness are then fixedly connected to the blade body 11. This design facilitates force dissipation within the blade 1. In another embodiment, the blade body 11 can be configured as multiple components of varying hardness, and the cutting portion 12 can be configured as a single unit with regions of varying hardness. The multiple components of the blade body 11 made of materials of varying hardness are then fixedly connected to the blade body 11. This design also facilitates force dissipation within the blade 1.

[0148] In another embodiment, the different hardness areas of the blade body 11 are made of different materials, and the different hardness areas of the cutting portion 12 are also made of different materials. The blade body 11 and the cutting portion 12 can be directly formed into one piece during molding to form a plurality of connected parts of different hardness. In addition, the cutting portion 12 and the blade body 11 can also be molded separately to form a plurality of parts of different hardness, and then the plurality of parts of different hardness are fixedly connected together. In this embodiment, the plurality of parts of different hardness of the cutting portion 12 and the plurality of parts of different hardness of the blade body 11 are molded separately, and then the plurality of parts are fixedly connected together by welding or the like.

[0149] It should be noted that the components of different hardness of the cutting part are connected into a whole, and the multiple components of different hardness of the blade body are connected into a whole; finally, the cutting part connected into a whole and the blade body connected into a whole are connected, and the above-mentioned connection method can adopt the same method, such as welding, adhesive connection, self-locking fastener connection, etc., which will not be repeated in this embodiment. Of course, in other embodiments, the above-mentioned connection method can also adopt different connection methods. In other words, the connection method of the components of different hardness of the cutting part, the connection method of the multiple components of different hardness of the blade body, and the connection method of the cutting part connected into a whole and the blade body connected into a whole, there are at least two different connection methods among these three connection methods; for example, A when there are two connection methods, 1) the connection method of the components of different hardness of the cutting part and the connection method of the multiple components of different hardness of the blade body adopt the first connection method, and the connection method between the cutting part and the blade body is different from the connection method of the components of different hardness of the cutting part. The invention relates to a method for connecting components of different hardness of the cutting part, that is, the method for connecting the cutting part and the blade body adopts the second method for connecting, which is different from the first method for connecting; 2) the method for connecting components of different hardness of the cutting part, and the method for connecting the cutting part and the blade body adopt the first method for connecting, while the method for connecting multiple components of different hardness of the blade body is different from the method for connecting components of different hardness of the cutting part, that is, the method for connecting multiple components of different hardness of the blade body adopts the second method for connecting, which is different from the first method for connecting; 3) the method for connecting components of different hardness of the cutting part adopts the first method for connecting, while the method for connecting the cutting part and the blade body, and the method for connecting multiple components of different hardness of the blade body adopt a method for connecting different components of different hardness of the cutting part, that is, the method for connecting multiple components of different hardness of the blade body, and the method for connecting the cutting part and the blade body all adopt the second method for connecting, which is different from the first method for connecting. The above-mentioned first connection method is, for example, welding, and the second connection method is, for example, adhesive connection or self-locking fastener connection; or, the first connection method is, for example, adhesive connection, and the second connection method is, for example, welding or self-locking fastener connection; or, the first connection method is, for example, self-locking fastener connection, and the second connection method is, for example, welding or adhesive connection.

[0150] When there are three connection methods, that is, the connection method of the components of different hardness of the cutting part is different from the connection method of the multiple components of different hardness of the blade body, the connection method of the multiple components of different hardness of the blade body is different from the connection method between the cutting part and the blade body, and the connection method between the cutting part and the blade body is different from the connection method of the components of different hardness of the cutting part, that is, the connection method of the components of different hardness of the cutting part adopts a first connection method, the connection method of the multiple components of different hardness of the blade body adopts a second connection method, and the connection method between the cutting part and the blade body adopts a third connection method, and the three connection methods are different. For example, the first connection method adopts welding, the second connection method adopts one of adhesive connection and self-fastening fastener connection, and the third connection method adopts another of adhesive connection and self-fastening fastener connection; for another example, the first connection method adopts adhesive connection, the second connection method adopts one of welding and self-fastening fastener connection, and the third connection method adopts another of welding and self-fastening fastener connection; for another example, the first connection method adopts self-fastening fastener connection, the second connection method adopts one of welding and adhesive connection, and the third connection method adopts another of welding and adhesive connection;

[0151] The cutting part and the blade body are connected by welding, while the parts of the cutting part (and / or the blade body) with different hardness are connected by adhesive (or self-fastening fasteners).

[0152] 2) The cutting part and the blade body are connected by welding, while the parts of the cutting part (and / or the blade body) with different hardness are connected by adhesive (or self-fastening fasteners)

[0153] like Figure 5 As shown, in one embodiment, one end of the blade body 11 is provided with a shaft mounting hole 111 for mounting a shaft 211. The shaft 211 is harder than the blade body 11. This reduces wear on the shaft 211 and, over long-term use, reduces wear on both the shaft 211 and the blade body 11, thereby reducing the frequency of blade 1 replacement. Generally, because the cutting portion 12 experiences significant wear during cutting operations, blade 1 replacement due solely to wear on the shaft 211 and the blade body 11 is unlikely to occur until the cutting portion 12 becomes worn and inoperable.

[0154] like Figure 1 As shown, in one embodiment, the blade 1 of the present disclosure further includes a de-edged area 13 for holding the blade body 11. The de-edged area 13 is provided on one end of the blade body 11 near the shaft mounting hole 111. Unlike the cutting portion 12, the de-edged area 13 does not have a cutting edge in order to facilitate the operator to hold the de-edged area 13 for replacement or maintenance of the blade 1.

[0155] Of course, in other embodiments, this can also be achieved by increasing the difference in hardness between the blade body and the cutting part, for example, the hardness of the cutting part is greater than the hardness of the blade body, and the difference in hardness between the cutting part and the blade body is greater than or equal to 40HRC and less than or equal to 80HRC.

[0156] Table 1

[0157]

[0158]

[0159]

[0160] Note: The word "approximately" after the numerical values in the table and above can be understood as measurement error, which is related to measurement accuracy. For example, the measurement error is within ±5 (for example, ±4, or ±3, or even ±1).

[0161] The blades used in power tools, such as lawn mowers, must have both a high toughness of the blade body and good wear resistance of the cutting edge. In some embodiments, a solution to meet these requirements is to set the blade body and cutting portion to different hardnesses, with the blade body's hardness being lower than the cutting portion's. However, as consumers demand increasingly sophisticated lawn mowers, the linear speed of the blade during cutting is increased to meet the demand for high-quality cuts. While increasing the linear speed, the difference between the hardness of the blade body and the hardness of the cutting portion is set to a larger value to meet the toughness requirements of the blade body and the wear resistance requirements of the cutting portion. Specifically, the hardness of the blade body is set to a lower value to meet the high toughness requirements of the base at high linear speeds, while the hardness of the cutting portion is set to a higher value to meet the high wear resistance requirements of mowing operations at high linear speeds. This prevents the blade from breaking when impacted by hard objects, particularly at the junction between the blade body and the cutting portion. Based on this, the present disclosure provides a blade solution to address the aforementioned issues, as detailed in the following embodiments.

[0162] like Figures 1 to 4 As shown, an embodiment of the present disclosure provides a blade 1, comprising a blade body 11 for connecting to a cutter disc, and a cutting portion 12 connected to the blade body 11 for performing a grass cutting operation. The hardness of the blade body 11 is less than that of the cutting portion 12, and the blade body 11 includes at least two regions of different hardness, and the cutting portion 12 includes at least two regions of different hardness.

[0163] The blade disclosed herein is configured to have at least two areas with different hardnesses on the blade body 11 and at least two areas with different hardnesses on the cutting portion 12. When the blade 1 is subjected to a large impact force, the force from the area with greater hardness can be released to the area with less hardness, which helps the blade 1 to transfer and eliminate the impact force it receives in a timely manner within the blade 1, thereby reducing the risk of the blade 1 breaking.

[0164] In one embodiment, the hardness of the cutting portion 12 can be in the range of [55HRC, 80HRC]. The provision of a high-hardness cutting portion improves the wear resistance of the blade 1, increases the service life of the blade 1, and allows the blade 1 to be used for a longer time before becoming blunt. Among them, HRC is the hardness unit ROCKWELL, i.e., Rockwell hardness. The hardness range of the cutting portion 12 disclosed in the present invention is provided to meet the use requirements of the wear resistance of the cutting portion 12. Generally speaking, within a certain range, the greater the hardness, the stronger the wear resistance of the cutting portion 12. The hardness of the cutting portion 12 is selected within the range of 55-80HRC, which not only meets the use requirements of the wear resistance of the cutting portion 12, but also avoids the difficulty of manufacturing the cutting portion 12 due to excessive hardness, resulting in high manufacturing and use costs of the blade 1. Specifically, the hardness of the cutting portion 12 can be 55HRC, 65HRC, 75HRC or 80HRC, etc.

[0165] In one embodiment, the linear speed of blade 1 is greater than or equal to 35 m / s. The blade 1 of the present disclosure can meet the requirements of high toughness and high wear resistance under this linear speed strength requirement, while significantly improving the efficiency of blade 1 in cutting grass. Specifically, the linear speed of blade 1 can be 35 m / s, 40 m / s, or 45 m / s, etc.

[0166] In one embodiment, the hardness of the blade body 11 can be in the range of [10HRC-35HRC]. The low hardness of the blade body 11 has higher toughness, which improves the impact resistance of the blade 1. When the blade 1 hits a hard object such as a stone, the blade body 11 can use its toughness to cushion the impact force, thereby effectively preventing the blade 1 from breaking. Specifically, the hardness of the blade body 11 can be 10HRC, 15HRC, 25HRC, or 35HRC.

[0167] Please also see Figure 4In a preferred embodiment, the blade body 11 includes a first hardness region 112 and a second hardness region 113. The first hardness region 112 is located on the outside of the blade body 11, and the second hardness region 113 is located on the inside of the blade body 11. The hardness of the first hardness region 112 is greater than that of the second hardness region 113. The blade body 11 is configured with two hardness regions. The first hardness region 112 is set to be harder, which is conducive to its grass cutting performance. The second hardness region 113 is set to be less hard than the first hardness region 112. This helps the first hardness region 112 transfer the impact force when cutting grass to the second hardness region 113, helps the first hardness region 112 to absorb the force, and effectively prevents the blade 1 from breaking.

[0168] In one embodiment, the area of the first hardness region 112 is smaller than the area of the second hardness region 113. The smaller hardness region is set to a larger area to enhance the force dissipation effect of the harder region. In another embodiment, the area of the first hardness region 112 can also be set to be greater than or equal to the area of the second hardness region 113.

[0169] In another embodiment, the blade body 11 may include one or more other regions of varying hardness in addition to the first hardness region 112 and the second hardness region 113. Within a certain range, the more regions of varying hardness the blade body 11 has, the better the force dissipation effect on the blade 1. However, the more regions of varying hardness the blade body 11 has, the higher the production cost of the blade 1. Furthermore, different usage environments may require different numbers of regions of varying hardness for the blade 1. Therefore, the number of regions of varying hardness on the blade body 11 can be adjusted based on usage.

[0170] Please also see Figure 4 In a preferred embodiment, the cutting portion 12 includes a third hardness region 121 and a fourth hardness region 122. The third hardness region 121 is located outside the cutting portion 12, and the fourth hardness region 122 is located inside the cutting portion 12. The hardness of the third hardness region 121 is greater than that of the fourth hardness region 122. Setting the hardness of the fourth hardness region 122 to be lower than that of the third hardness region 121 facilitates transferring the impact force received by the third hardness region 121 to the fourth hardness region 122, helping the third hardness region 121 to dissipate the force, and effectively preventing the blade 1 from breaking.

[0171] In one embodiment, the area of the third hardness region 121 is smaller than that of the fourth hardness region 122. The smaller hardness region is larger, thereby enhancing the force dissipation effect of the harder region. In another embodiment, the area of the third hardness region 121 can be set to be greater than or equal to that of the fourth hardness region 122.

[0172] In another embodiment, the cutting portion 12 may further include one or more regions of varying hardness in addition to the third hardness region 121 and the fourth hardness region 122. Within a certain range, the more regions of varying hardness the cutting portion 12 comprises, the better the impact relief effect on the blade 1. However, the more regions of varying hardness the cutting portion 12 comprises, the higher the manufacturing cost of the blade 1. Different usage environments also require different numbers of hardness regions for the blade 1. Therefore, the number of regions of varying hardness on the cutting portion 12 can be adjusted based on usage.

[0173] In one embodiment, the number of regions of varying hardness on the blade body 11 is greater than the number of regions of varying hardness on the cutting portion 12. Generally, the area of the blade body 11 is larger than the area of the cutting portion 12, making it easier for the blade body 11 to have more regions of varying hardness than the cutting portion 12. The greater number of regions of varying hardness on the blade body 11 enhances the force dissipation effect of the blade 1.

[0174] In another embodiment, the number of regions of different hardness of the blade body 11 may be equal to or less than the number of regions of different hardness of the cutting portion 12 .

[0175] See also Figure 5 It should be understood that the outer side and inner side described in the present disclosure are based on the blade 1 as a whole, the setting direction toward the edge of the blade 1 is the outer side, and the setting direction toward the inside of the blade 1 is the inner side.

[0176] In one embodiment, the width of the cutting portion 12 can be in the range of [0.1 mm, 5 mm]. The width of the cutting portion 12 can be set as long as it meets the cutting requirements of the cutting portion 12 and ensures that the cutting portion 12 can be reliably connected to the blade body 11. This can significantly reduce the production cost of the blade 1 while ensuring the wear resistance of the blade 1. Specifically, the width of the cutting portion can be 0.1 mm, 1 mm, 2 mm, or 5 mm.

[0177] In one embodiment, the blade 1 is made of a whole piece of plate. By performing different degrees of hardening treatment on the blade body 11 and the cutting portion 12, such as laser quenching, edge carburizing or induction quenching, the blade body 11 and the cutting portion 12 are obtained, each having different hardness areas, so as to meet the high toughness requirements of the blade body 11 while meeting the high wear resistance requirements of the cutting portion 12.

[0178] In some embodiments, the blade 1 can be made from a single piece of plate material, and a tempering process can be performed to make the metal grains of the blade body 11 denser, thereby improving the impact resistance of the blade body 11. The cutting portion can be hardened by laser quenching the edge, thereby obtaining a blade 1 with a cutting portion harder than the blade body 11. Of course, in other embodiments, laser quenching can be replaced by other processes, such as edge carburizing, induction hardening, etc.

[0179] In another embodiment, the blade body 11 can be configured as a single unit with regions of varying hardness, and the cutting portion 12 can be configured as multiple components of varying hardness. The multiple components of the cutting portion 12 made of materials of varying hardness are then fixedly connected to the blade body 11. This design facilitates force dissipation within the blade 1. In another embodiment, the blade body 11 can be configured as multiple components of varying hardness, and the cutting portion 12 can be configured as a single unit with regions of varying hardness. The multiple components of the blade body 11 made of materials of varying hardness are then fixedly connected to the blade body 11. This design also facilitates force dissipation within the blade 1.

[0180] In another embodiment, the different hardness areas of the blade body 11 are made of different materials, and the different hardness areas of the cutting portion 12 are also made of different materials. The blade body 11 and the cutting portion 12 can be directly formed into one piece during molding to form a plurality of connected parts of different hardness. In addition, the cutting portion 12 and the blade body 11 can also be molded separately to form a plurality of parts of different hardness, and then the plurality of parts of different hardness are fixedly connected together. In this embodiment, the plurality of parts of different hardness of the cutting portion 12 and the plurality of parts of different hardness of the blade body 11 are molded separately, and then the plurality of parts are fixedly connected together by welding or the like.

[0181] It should be noted that the components of different hardness of the cutting part are connected into a whole, and the multiple components of different hardness of the blade body are connected into a whole; finally, the cutting part connected into a whole and the blade body connected into a whole are connected, and the above-mentioned connection method can adopt the same method, such as welding, adhesive connection, self-locking fastener connection, etc., which will not be repeated in this embodiment. Of course, in other embodiments, the above-mentioned connection method can also adopt different connection methods. In other words, the connection method of the components of different hardness of the cutting part, the connection method of the multiple components of different hardness of the blade body, and the connection method of the cutting part connected into a whole and the blade body connected into a whole, there are at least two different connection methods among these three connection methods; for example, A when there are two connection methods, 1) the connection method of the components of different hardness of the cutting part and the connection method of the multiple components of different hardness of the blade body adopt the first connection method, and the connection method between the cutting part and the blade body is different from the connection method of the components of different hardness of the cutting part. The invention relates to a method for connecting components of different hardness of the cutting part, that is, the method for connecting the cutting part and the blade body adopts the second method for connecting, which is different from the first method for connecting; 2) the method for connecting components of different hardness of the cutting part, and the method for connecting the cutting part and the blade body adopt the first method for connecting, while the method for connecting multiple components of different hardness of the blade body is different from the method for connecting components of different hardness of the cutting part, that is, the method for connecting multiple components of different hardness of the blade body adopts the second method for connecting, which is different from the first method for connecting; 3) the method for connecting components of different hardness of the cutting part adopts the first method for connecting, while the method for connecting the cutting part and the blade body, and the method for connecting multiple components of different hardness of the blade body adopt a method for connecting different components of different hardness of the cutting part, that is, the method for connecting multiple components of different hardness of the blade body, and the method for connecting the cutting part and the blade body all adopt the second method for connecting, which is different from the first method for connecting. The above-mentioned first connection method is, for example, welding, and the second connection method is, for example, adhesive connection or self-locking fastener connection; or, the first connection method is, for example, adhesive connection, and the second connection method is, for example, welding or self-locking fastener connection; or, the first connection method is, for example, self-locking fastener connection, and the second connection method is, for example, welding or adhesive connection.

[0182] When there are three connection methods, that is, the connection method of the components of different hardness of the cutting part is different from the connection method of the multiple components of different hardness of the blade body, the connection method of the multiple components of different hardness of the blade body is different from the connection method between the cutting part and the blade body, and the connection method between the cutting part and the blade body is different from the connection method of the components of different hardness of the cutting part, that is, the connection method of the components of different hardness of the cutting part adopts a first connection method, the connection method of the multiple components of different hardness of the blade body adopts a second connection method, and the connection method between the cutting part and the blade body adopts a third connection method, and the three connection methods are different. For example, the first connection method adopts welding, the second connection method adopts one of adhesive connection and self-fastening fastener connection, and the third connection method adopts another of adhesive connection and self-fastening fastener connection; for another example, the first connection method adopts adhesive connection, the second connection method adopts one of welding and self-fastening fastener connection, and the third connection method adopts another of welding and self-fastening fastener connection; for another example, the first connection method adopts self-fastening fastener connection, the second connection method adopts one of welding and adhesive connection, and the third connection method adopts another of welding and adhesive connection;

[0183] The cutting part and the blade body are connected by welding, while the parts of the cutting part (and / or the blade body) with different hardness are connected by adhesive (or self-fastening fasteners).

[0184] 2) The cutting part and the blade body are connected by welding, while the parts of the cutting part (and / or the blade body) with different hardness are connected by adhesive (or self-fastening fasteners)

[0185] like Figure 5 As shown, in one embodiment, one end of the blade body 11 is provided with a shaft mounting hole 111 for mounting a shaft 211. The shaft 211 is harder than the blade body 11. This reduces wear on the shaft 211 and, over long-term use, reduces wear on both the shaft 211 and the blade body 11, thereby reducing the frequency of blade 1 replacement. Generally, because the cutting portion 12 experiences significant wear during cutting operations, blade 1 replacement due solely to wear on the shaft 211 and the blade body 11 is unlikely to occur until the cutting portion 12 becomes worn and inoperable.

[0186] like Figure 1 As shown, in one embodiment, the blade 1 of the present disclosure further includes a de-edged area 13 for holding the blade body 11. The de-edged area 13 is provided on one end of the blade body 11 near the shaft mounting hole 111. Unlike the cutting portion 12, the de-edged area 13 does not have a cutting edge in order to facilitate the operator to hold the de-edged area 13 for replacement or maintenance of the blade 1.

[0187] like Figure 5 As shown, another embodiment of the present disclosure further discloses a lawn mower 2, including a body 22, a cutter disc 21 and a blade assembly; wherein the cutter disc 21 is set on the body 22, the blade assembly is connected to the cutter disc 21 and rotates with the cutter disc 21 to perform mowing operations, and the blade assembly includes at least two blades 1 as in the above embodiment.

[0188] The lawn mower 2 in this embodiment is configured to have at least two areas of different hardness in the blade body 11 and at least two areas of different hardness in the cutting portion 12. When the blade 1 is subjected to a large impact force, the force in the area of greater hardness can be released to the area of less hardness, which helps the blade 1 to transfer and eliminate the impact force it receives in a timely manner within the blade 1, thereby reducing the risk of the blade 1 breaking.

[0189] like Figure 5 As shown, in a preferred embodiment, the lawn mower 2 of the present disclosure is provided with multiple blades 1, which are arranged layer by layer from top to bottom on the cutter disc 21 in a stepped distribution. That is, the diameter of the cutting path of the blade 1 located at the top is larger than the diameter of the cutting path located at the bottom. Because the diameter of the cutting path at the top is larger, during the cutting process, the blade 1 located at the top will first contact the grass and cut the upper end of the grass; the blade 1 located in the middle of the cutter disc 21 will then cut the grass; and the blade 1 located at the bottom will cut the part of the grass close to the ground, thereby ensuring that the long grass is cut into smaller pieces. In addition, while ensuring that the grass is cut into smaller pieces, a certain distance is placed between adjacent blades 1, generally 10-20 mm, to prevent adjacent blades 1 from colliding with each other and causing damage to the blades 1. Preferably, the number of blades 1 can be 3, 5, 6, or 8, etc.

[0190] It should be noted that the above description only describes some embodiments of the present disclosure. Other embodiments are within the scope of the appended claims. In some cases, the actions or steps recited in the claims can be performed in a different order than described in the above embodiments and still achieve the desired results. Furthermore, the processes depicted in the accompanying drawings do not necessarily require the specific order or sequential order shown to achieve the desired results.

[0191] Those skilled in the art should understand that the discussion of any of the above embodiments is merely illustrative and is not intended to imply that the scope of the present disclosure (including the claims) is limited to these examples. Within the scope of the present disclosure, the technical features in the above embodiments or different embodiments may be combined, the steps may be implemented in any order, and there are many other variations of the different aspects of the embodiments of the present disclosure as described above, which are not provided in detail for the sake of simplicity.

[0192] The embodiments of the present disclosure are intended to cover all such substitutions, modifications, and variations that fall within the broad scope of the appended claims. Therefore, any omissions, modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the embodiments of the present disclosure should be included in the scope of protection of the present disclosure.

Claims

1. A lawn mower, characterized in that: include: body; A moving module drives the lawn mower to move; A cutter disc having at least one blade, the cutter disc rotates under the drive of a cutting motor, thereby driving the blade to rotate, the blade comprising: a blade body for connecting to the cutter disc, and a cutting portion connected to the blade body for performing a grass cutting operation; When the travel speed is greater than or equal to 1 m / s and the linear speed of the blade is greater than or equal to 30 m / s and less than or equal to 70 m / s, the hardness of the blade body ranges from 5 to 45 HRC.

2. The lawn mower according to claim 1, wherein: When the travel speed is greater than or equal to 1 m / s and the linear speed of the blade is greater than or equal to 40 m / s and less than or equal to 60 m / s, the hardness of the blade body is in the range of 10-30 HRC.

3. The lawn mower according to claim 2, wherein: When the travel speed is greater than or equal to 1.5 m / s and the linear speed of the blade is greater than or equal to 40 m / s and less than or equal to 60 m / s, the hardness of the blade body is in the range of 10-30 HRC.

4. The lawn mower according to claim 3, characterized in that When the travel speed is greater than or equal to 2 m / s and the linear speed of the blade is greater than or equal to 40 m / s and less than or equal to 60 m / s, the hardness of the blade body is in the range of 10-30 HRC.

5. The lawn mower according to claim 2, wherein: When the travel speed is greater than or equal to 1 m / s and the linear speed of the blade is greater than or equal to 40 m / s and less than or equal to 60 m / s, the hardness of the blade body is in the range of 10-25 HRC.

6. The lawn mower according to claim 3, characterized in that When the travel speed is greater than or equal to 1.5 m / s and the linear speed of the blade is greater than or equal to 40 m / s and less than or equal to 60 m / s, the hardness of the blade body is in the range of 10-25 HRC.

7. The lawn mower according to claim 4, characterized in that When the travel speed is greater than or equal to 2 m / s and the linear speed of the blade is greater than or equal to 40 m / s and less than or equal to 60 m / s, the hardness of the blade body is in the range of 10-25 HRC.

8. The lawn mower according to any one of claims 1 to 7, characterized in that: The hardness of the cutting portion is greater than or equal to 50HRC.

9. The lawn mower according to claim 8, characterized in that The hardness of the cutting portion is greater than or equal to 60HRC.

10. The lawn mower according to claim 9, characterized in that The hardness of the cutting portion is in the range of 60-70HRC.

11. The lawn mower according to claim 8, characterized in that The length of the blade extending out of the cutter disc is 5-70 mm.

12. The lawn mower according to claim 11, characterized in that The length of the blade extending from the cutter disc is 30-70 mm.

13. The lawn mower according to claim 8, wherein The thickness of the blade is 0.5-2 mm.

14. The lawn mower according to claim 8, wherein The number of the blades is 3-6.

15. The lawn mower according to claim 8, wherein One end of the blade body is provided with a shaft mounting hole for mounting a shaft, and the hardness of the shaft is greater than the hardness of the blade body.

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