Cutting blade, composite cutter, and lawn mower

Abstract

The present invention relates to a cutting blade, a composite cutter, and a lawn mower. The cutting blade comprises a blade base part, a cutting part, a connecting part, and a cutting edge; the blade base part is configured to rotate around a rotating shaft in a first plane, and the first plane is a plane where the upper wall of the blade base part is located; the cutting part is arranged on the blade base part along a first straight line, and the first straight line is a direction of a diameter along which a blade rotates; the connecting part is connected to the blade base part and the cutting part; and the cutting edge is arranged in a direction of rotational advancement of the cutting part, that is, the cutting edge is firstly in contact with vegetation during rotation of the cutting blade. The lawn mower of the present invention comprises the cutting blade. The cutting blade provided by the present invention can effectively reduce power consumption and quickly discharge cropped grass outwards; in the case of ensuring the same rotational speed, the cutting blade of the present invention has a significant power consumption advantage compared with the prior art, and the lawn mower equipped with the cutting blade of the present invention can have a stronger endurance capability.

Description

Cutting blade, compound knife and lawn mower [Technical field]

[0001] The present invention relates to the technical field of lawn mowers, in particular to a cutting blade, a composite knife and a lawn mower. [Background Technology]

[0002] A lawn mower is a device primarily used in gardening operations to cut and maintain grass. One of its most important functions is mowing. The quality of its mowing performance is determined by factors such as the mowing load, grass discharge, and grass collection capabilities. The blades installed in the cutting deck are in direct contact with the grass during mowing. The mower drives the cutting deck forward, and the blades inside the cutting deck rotate rapidly under the power source to cut the vegetation.

[0003] To improve the performance of lawn mowers, various manufacturers have made certain improvements to the blades. These improvements are all concentrated on changing the bending shape and flange angle of the blade. However, these bends and flanges can only provide an upward thrust for the grass cutters. There is indeed a certain degree of power consumption optimization, but the optimization effect is relatively limited. For this reason, we propose a cutting blade, a compound knife, and a lawn mower that can further reduce power consumption. [Summary of the invention]

[0004] In view of the shortcomings of the prior art, the object of the present invention is to provide a cutting blade, a compound knife and a lawn mower that can reduce power consumption.

[0005] The technical solution adopted by the present invention to solve the problems of the prior art is:

[0006] A cutting blade for a lawn mower, mounted on a cutting deck of the lawn mower, comprising:

[0007] a blade base configured to rotate about a rotation axis in a first plane;

[0008] a connecting portion connected to one side of the blade base;

[0009] a cutting portion connected to the connecting portion along a first straight line on a side away from the base of the blade, the first straight line being a diameter direction of rotation of the blade;

[0010] A blade is arranged in the rotational forward direction of the cutting portion;

[0011] definition:

[0012] The second straight line is perpendicular to the first straight line and lies in the first plane. The intersection of the first straight line and the second straight line coincides with the projection of the rotation axis on the first plane.

[0013] The second plane passes through the first straight line and the axis of rotation,

[0014] The third plane passes through the second line and the axis of rotation,

[0015] The third straight line is perpendicular to the cutting portion;

[0016] The outer end portion and the inner end portion of the cutting portion along the first straight line are not at the same height;

[0017] The blade has a cutting edge for cutting vegetation, wherein the cutting edge is parallel to the first plane but not parallel to the first straight line.

[0018] A further improved solution is that the outer end of the cutting portion along the first straight line is lower than the inner end, and the cutting edge is inclined toward the counter-rotation side along the direction of the first straight line.

[0019] A further improved solution is that the outer end of the cutting portion along the first straight line is higher than the inner end, and the cutting edge is inclined toward the forward rotation side along the direction of the first straight line.

[0020] A further improvement is that the connecting edge between the connecting portion and the blade base is the first edge, the connecting edge between the connecting portion and the cutting portion is the second edge, the first edge intersects with the second edge or the extension line of the first edge intersects with the extension line of the second edge.

[0021] A further improved solution is that the projection of the connecting portion on the first plane is a triangle or a trapezoid.

[0022] A further improved solution is that the angle between the projection of the third straight line in the second plane and the rotation axis is 0 to 10°.

[0023] A further improvement is that the end of the cutting portion in the forward rotation direction is lower than the end of the cutting portion in the reverse rotation direction.

[0024] A further improved solution is that the angle between the projection of the third straight line in the third plane and the rotation axis is 0 to 45°.

[0025] A further improvement is that the angle between the cutting edge and the first straight line is 0 to 45 degrees.

[0026] A further improvement is that the angle between the cutting edge and the first straight line is 5 to 20 degrees.

[0027] A further improved solution is: the cutting blade includes two cutting parts, and the cutting edges of the two cutting parts are coplanar.

[0028] A further improvement is that: the two cutting edges are both linear structures, the straight lines where the two cutting edges are located are parallel to each other and the distance between them is 20mm to 1110mm.

[0029] A further improvement is that the cutting edge is composed of a plurality of blade edges, and the blade edges are of a straight line structure or an arc structure.

[0030] The present invention also discloses another cutting blade for a lawn mower, which is assembled on a cutting table of the lawn mower and comprises:

[0031] a blade base configured to rotate about a rotation axis in a first plane;

[0032] a connecting portion connected to one side of the blade base;

[0033] a cutting portion connected to the connecting portion along a first straight line on a side away from the base of the blade, the first straight line being a diameter direction of rotation of the blade;

[0034] a blade having a cutting edge for cutting vegetation, the blade being arranged in a rotational forward direction of the cutting portion;

[0035] The cutting portion has two torsion axes relative to the blade base, the first torsion axis is parallel to the first straight line, and the second torsion axis is parallel to the rotation axis, the cutting portion is twisted around the first torsion axis so that the cutting edge is lower than the blade base, and the cutting portion is twisted around the second torsion axis so that the cutting edge is not parallel to the first straight line;

[0036] The cutting edge is parallel to the first plane.

[0037] A further improvement is that the connecting portion smoothly transitions to the cutting portion along the edge of the blade base.

[0038] A further improvement is that the direction in which the cutting portion twists around the second torsion axis is the reverse rotation direction of the cutting blade for mowing, and the outer end portion of the cutting portion along the first straight line is lower than the inner end portion.

[0039] A further improvement is that the direction in which the cutting portion is twisted around the second torsion axis is the forward rotation direction of the cutting blade for mowing grass, and the outer end portion of the cutting portion along the first straight line is higher than the inner end portion.

[0040] A further improved solution is: the cutting blade includes two cutting parts, and the cutting edges of the two cutting parts are coplanar.

[0041] A further improved solution is that the cutting portion is twisted around the second torsion axis at an angle of 0 to 45°.

[0042] A further improved solution is that the cutting portion is twisted around the first torsion axis at an angle of 0 to 45°.

[0043] A further improved solution is that the projection of the first torsion axis on the first plane is located on the counter-rotation side of the edge of the blade base in the forward rotation direction.

[0044] A further improved solution is that the projection of the first torsion axis on the first plane is located between the edge in the forward rotation direction and the edge in the reverse rotation direction of the blade base.

[0045] A further improved solution is that the projection of the first torsion axis on the first plane is located on the counter-rotation side of the counter-rotation direction edge of the blade base.

[0046] A further improved solution is that the highest point of the connecting portion in the direction of the cutting blade's rotation axis is located in the first plane.

[0047] The present invention also discloses a composite knife, comprising a cutting blade as described in any one of the above items and a second blade, wherein the second blade has a second edge located in the reverse rotation direction of the blade and at least partially higher than the cutting portion, and the second blade and the cutting blade rotate around the same straight line when driven to perform mowing operations.

[0048] The present invention also discloses a lawn mower, comprising:

[0049] Frame;

[0050] A drive system connected to the frame and used to generate a driving force to enable the lawn mower to move on the ground;

[0051] A cutting platform is arranged at the lower part of the frame, and a cutting blade is installed in the cutting platform;

[0052] A cutting motor, mounted on the cutting table and used to drive the cutting blade to rotate;

[0053] An energy source for providing electrical energy to the drive system and the cutting motor in the cutting table;

[0054] The control system, signal connection drive system and cutting table, is used to control the movement of the mower and the operation of the cutting motor to perform mowing;

[0055] The cutting blade comprises:

[0056] a blade base configured to rotate about a rotation axis in a first plane;

[0057] a connecting portion connected to one side of the blade base;

[0058] a cutting portion connected to the connecting portion along a first straight line on a side away from the base of the blade, the first straight line being a diameter direction of rotation of the blade;

[0059] A blade is arranged in the rotational forward direction of the cutting portion;

[0060] The outer end portion and the inner end portion of the cutting portion along the first straight line are not at the same height;

[0061] The blade has a cutting edge for cutting vegetation, wherein the cutting edge is parallel to the first plane but not parallel to the first straight line.

[0062] A further improvement is that the control system includes a manipulation module for controlling the opening and closing of the drive system and a PTO switch for controlling the opening and closing of the cutting motor.

[0063] A further improvement is that the lawn mower further comprises a lifting mechanism disposed between the frame and the cutting platform, and the lifting mechanism can controllably drive the cutting platform to move up and down to adjust the cutting height.

[0064] The present invention also discloses another lawn mower, comprising:

[0065] Frame;

[0066] A drive system connected to the frame and used to generate a driving force to enable the lawn mower to move on the ground;

[0067] A cutting platform is arranged at the lower part of the frame, and a cutting blade is installed in the cutting platform;

[0068] A cutting motor, mounted on the cutting table and used to drive the cutting blade to rotate;

[0069] An energy source for providing electrical energy to the drive system and the cutting motor in the cutting table;

[0070] The control system, signal connection drive system and cutting table, is used to control the movement of the mower and the operation of the cutting motor to perform mowing;

[0071] The cutting blade comprises:

[0072] a blade base configured to rotate about a rotation axis in a first plane;

[0073] a connecting portion connected to one side of the blade base;

[0074] a cutting portion connected to the connecting portion along a first straight line on a side away from the base of the blade, the first straight line being a diameter direction of rotation of the blade;

[0075] a blade having a cutting edge for cutting vegetation, the blade being arranged in a rotational forward direction of the cutting portion;

[0076] The cutting portion has two torsion axes relative to the blade base, the first torsion axis is parallel to the first straight line, and the second torsion axis is parallel to the rotation axis, the cutting portion rotates around the first torsion axis so that the cutting edge is lower than the blade base, and the cutting portion rotates around the second torsion axis so that the cutting edge is not parallel to the first straight line;

[0077] The cutting edge is parallel to the first plane.

[0078] A further improvement is that the control system includes a manipulation module for controlling the opening and closing of the drive system and a PTO switch for controlling the opening and closing of the cutting motor.

[0079] A further improvement is that the vehicle further includes a lifting mechanism disposed between the vehicle frame and the cutting platform, wherein the lifting mechanism can controllably drive the cutting platform to move up and down to adjust the cutting height.

[0080] The present invention also discloses another lawn mower, comprising:

[0081] Frame;

[0082] A drive system connected to the frame and used to generate a driving force to enable the lawn mower to move on the ground;

[0083] A cutting platform is arranged at the lower part of the frame, and a composite knife is installed in the cutting platform;

[0084] Cutting motor, mounted on the cutting table and used to drive the compound knife to rotate;

[0085] An energy source for providing electrical energy to the drive system and the cutting motor in the cutting table;

[0086] The control system, signal connection drive system and cutting table, is used to control the movement of the mower and the operation of the cutting motor to perform mowing;

[0087] The composite knife includes a cutting blade and a second blade, and the cutting blade includes:

[0088] a blade base configured to rotate about a rotation axis in a first plane;

[0089] a connecting portion connected to one side of the blade base;

[0090] a cutting portion connected to the connecting portion along a first straight line on a side away from the base of the blade, the first straight line being a diameter direction of rotation of the blade;

[0091] A blade is arranged in the rotational forward direction of the cutting portion;

[0092] The outer end portion and the inner end portion of the cutting portion along the first straight line are not at the same height;

[0093] The blade has a cutting edge for cutting vegetation, wherein the cutting edge is parallel to the first plane but not parallel to the first straight line;

[0094] The second blade includes a second edge located in a direction counter to the blade rotation and higher than the cutting portion. The second blade and the cutting blade rotate around the same straight line when driven to perform a mowing operation.

[0095] The present invention also discloses another lawn mower, comprising:

[0096] Frame;

[0097] A drive system connected to the frame and used to generate a driving force to enable the lawn mower to move on the ground;

[0098] A cutting platform is arranged at the lower part of the frame, and a composite knife is installed in the cutting platform;

[0099] Cutting motor, mounted on the cutting table and used to drive the compound knife to rotate;

[0100] An energy source for providing electrical energy to the drive system and the cutting motor in the cutting table;

[0101] The control system, signal connection drive system and cutting table, is used to control the movement of the mower and the operation of the cutting motor to perform mowing;

[0102] The composite knife includes a cutting blade and a second blade, and the cutting blade includes:

[0103] a blade base configured to rotate about a rotation axis in a first plane;

[0104] a connecting portion connected to one side of the blade base;

[0105] a cutting portion connected to the connecting portion along a first straight line on a side away from the base of the blade, the first straight line being a diameter direction of rotation of the blade;

[0106] a blade having a cutting edge for cutting vegetation, the blade being arranged in a rotational forward direction of the cutting portion;

[0107] The cutting portion has two torsion axes relative to the blade base, the first torsion axis is parallel to the first straight line, and the second torsion axis is parallel to the rotation axis, the cutting portion rotates around the first torsion axis so that the cutting edge is lower than the blade base, and the cutting portion rotates around the second torsion axis so that the cutting edge is not parallel to the first straight line;

[0108] The cutting edge is parallel to the first plane;

[0109] The second blade includes a second edge located in a direction counter to the blade rotation and higher than the cutting portion. The second blade and the cutting blade rotate around the same straight line when driven to perform a mowing operation.

[0110] Compared with the prior art, the present invention has the following beneficial effects:

[0111] In the present invention, the outer end of the cutting portion of the cutting blade along the first straight line is lower than the inner end, so that when the grass clippings come into contact with the cutting portion, they are subjected to a force component along the first straight line, thereby enabling the grass clippings to be discharged outward at a faster speed rather than being accumulated on top of the mowing blade, thereby reducing the blade load and power consumption.

[0112] The cutting edge of the cutting blade in the present invention is parallel to the first plane, which not only ensures that the blade cuts the grass flatly during the initial use, but also ensures that the cutting edge remains horizontal and continues to maintain the original ability to cut the grass flatly after the blade is worn and polished, and the cutting height does not change; it also reduces the frequency of blade replacement by users, that is, reduces the cost of use.

[0113] The cutting edge of the blade in the present invention forms an angle with the first straight line, which makes the cutting force of the blade on the grass have a component along the direction of the first straight line, further accelerating the discharge of the broken grass, and again reducing the blade load and power consumption.

[0114] In the present invention, the end of the cutting part in the forward rotation direction is lower than the end of the cutting part in the reverse rotation direction, so that the cutting part generates a component force in the vertical direction when cutting the grass clippings. At the same time, the airflow generated by the component force along the first straight line direction of the aforementioned blade can quickly discharge the grass clippings outward, thereby reducing power consumption.

[0115] To sum up, the cutting blade proposed in the present invention can effectively reduce power consumption and quickly discharge grass clippings. While ensuring the same rotation speed, the cutting blade of the present invention has obvious power consumption advantages compared with the prior art. The lawn mower equipped with the cutting blade of the present invention can have stronger endurance. [Brief Description of the Drawings]

[0116] The specific embodiments of the present invention are further described in detail below with reference to the accompanying drawings:

[0117] FIG1 is a schematic diagram of a push-type lawn mower equipped with a cutting table having a cutting blade according to the present invention;

[0118] FIG2 is a schematic diagram of a riding lawn mower equipped with a cutting table having a cutting blade according to the present invention;

[0119] FIG3 is a perspective view of one embodiment of a cutting blade of the present invention;

[0120] FIG4 is a front view of one embodiment of a cutting blade of the present invention;

[0121] FIG5 is a top view of one embodiment of a cutting blade of the present invention;

[0122] FIG6 is a schematic cross-sectional view of the cutting blade shown in FIG5 taken along line A;

[0123] FIG7 is a partial enlarged view of FIG6;

[0124] FIG8 is a B-direction view of the cutting blade shown in FIG5;

[0125] FIG9 is a view corresponding to the perspective of FIG6 when the cutting portion is a curved surface;

[0126] FIG10 is a front view of a straight blade in the prior art;

[0127] FIG11 is a top view of a straight blade in the prior art;

[0128] FIG12 is a schematic cross-sectional view of the straight blade shown in FIG11 in the direction C;

[0129] FIG13 is a D-direction view of the straight blade shown in FIG11;

[0130] FIG14 is an exploded view of one embodiment of a header installation of two cutting blades of the present invention;

[0131] FIG15 is a bottom view of the header shown in FIG14;

[0132] Figures 16 and 17 are comparisons of wind speed at the grass outlet under different angles for straight blades and oblique blades during simulation;

[0133] Figures 18 and 19 are comparisons of chassis suction at different angles for straight and oblique blades during simulation, respectively;

[0134] Figures 20 and 21 are comparison diagrams of the airflow velocity vector at 50 mm above the blade for straight blades and oblique blades at different angles during simulation;

[0135] FIG22 is a graph showing the total power consumption of a straight blade and an oblique blade at different angles during simulation;

[0136] FIG23 is a diagram showing the chassis suction force curves of the straight blade and the oblique blade at different angles during simulation;

[0137] FIG24 is a flow curve diagram of the grass discharge port at different angles for straight blades and oblique blades during simulation;

[0138] FIG25 is a top view of another embodiment of a cutting blade of the present invention;

[0139] FIG26 is a front view of another embodiment of the cutting blade of the present invention;

[0140] FIG27 is a schematic cross-sectional view of the cutting blade shown in FIG25 taken along the G direction;

[0141] FIG28 is a partial enlarged schematic diagram of FIG27;

[0142] FIG29 is a view of the cutting blade shown in FIG25 taken along the direction E;

[0143] FIG30 is an exploded view of another embodiment of the present invention is installed on the header two cutting blades;

[0144] FIG31 is a bottom view of the header shown in FIG28;

[0145] FIG32 is a perspective view of another embodiment of a cutting blade of the present invention;

[0146] FIG33 is a top view of the cutting blade shown in FIG32;

[0147] FIG34 is a side view of the cutting blade shown in FIG32;

[0148] FIG35 is a perspective view of another embodiment of a cutting blade of the present invention;

[0149] FIG36 is a top view of the cutting blade shown in FIG35;

[0150] FIG37 is a side view of the cutting blade shown in FIG35;

[0151] FIG38 is a top view of the composite knife of the present invention;

[0152] FIG39 is a perspective view of a composite knife according to the present invention;

[0153] Figures 40 and 41 are schematic diagrams of a cutting blade according to another embodiment of the present invention.

[0154] The meanings of the reference numerals in the figure are as follows: 1. blade base; 2. connecting part; 3. cutting part; 31. radial outer end part; 32. radial inner end part; 33. end part in the counter-rotating direction; 34. end part in the forward rotation direction; 35. radial outer end part; 36. radial inner end part; 4. blade; 5. cutting edge; 61. first straight line; 62. second straight line; 63. rotation axis; 71. first plane; 72. second plane; 73. third plane; 8. third straight line; 9. cutting table; 10. frame; 11. driving wheel; 12. seat; 13. first torsion axis; 14. second torsion axis; 15. edge in the forward rotation direction; 16. edge in the counter-rotating direction; 17. knife seat; 18. gasket; 19. bolt; 101. reinforcement rib. [Specific implementation method]

[0155] The terms used in this disclosure are for the purpose of describing specific embodiments only and are not intended to limit the disclosure. For example, terms such as "upper," "lower," "front," and "back" that indicate orientation or positional relationships are based solely on the orientation or positional relationships shown in the accompanying drawings and are intended solely to facilitate and simplify the description of the disclosure. They do not indicate or imply that the device referred to must have a specific orientation or be constructed or operated in a specific orientation, and therefore should not be construed as limiting the disclosure.

[0156] The blade is one of the most important components of a lawn mower. When mowing, the blade rotates to cut the grass on the ground. A considerable amount of energy is used to drive the blade to rotate when the lawn mower is working. The shape of the blade directly affects the mowing effect and the power consumption of the entire machine. Therefore, it is particularly important to propose a cutting blade that can reduce mowing power consumption while still ensuring good mowing effect.

[0157] Please refer to FIG3 to FIG8 , which are shown in the first embodiment of the cutting blade disclosed in the present invention, comprising: a blade base 1, a connecting portion 2, a cutting portion 3, and a blade 4;

[0158] The blade base 1 is configured to rotate around the rotation axis 63 within a first plane 71. The first plane 71 is the plane where the upper wall of the blade base 1 is located. The connecting portion 2 is connected to one side of the blade base 1. The cutting portion 3 is connected to the side of the connecting portion 2 away from the blade base 1 along a first straight line 61. The first straight line 61 is the diameter direction of the blade rotation (the direction of blade rotation refers to the hollow arrows in Figures 3 and 5. Taking a top view as an example, the blade rotates clockwise, that is, the forward rotation direction is clockwise, and the reverse rotation direction is counterclockwise). The cutting edge 4 is arranged in the forward rotation direction of the cutting portion 3, that is, the cutting edge 4 is the first to contact the vegetation when the cutting blade rotates;

[0159] 3 , for ease of understanding, the following definitions are made: the second straight line 62 is perpendicular to the first straight line 61 and is located in the first plane 71 , the second plane 72 passes through the first straight line 61 and the rotation axis 63 , and the third plane 73 passes through the second straight line 62 and the rotation axis 63 ;

[0160] In this embodiment, the outer end of the cutting portion 3 along the first straight line 61 is lower than the inner end, that is, the upper surface of the cutting portion 3 gradually decreases outward from the rotation axis 63. Referring to Figures 6 and 7, the radial outer end 31 of the cutting portion 3 in the figure is lower than the radial inner end 32. When the grass contacts the upper surface of the cutting portion 3, the impact force of the cutting portion 3 on the grass has a component along the direction of the first straight line 61, thereby prompting the cut grass to be discharged outward.

[0161] Referring to Figures 3 and 5 , cutting edge 5 is tilted toward the counter-rotating side along first line 61, with an angle α1 between cutting edge 5 and first line 61. When the blade rotates to cut grass, cutting force F1 is directed along the normal to the contact surface between cutting edge 5 and the grass. This force can be decomposed into a force component F11 directed outward along first line 61 and a force component F12 directed along second line 62, where F11 = F1*sinα1 and F12 = F1*cosα1. Clearly, F11 is more conducive to outward grass removal, while F12 is the force that propels grass clippings forward. Theoretically, when cutting force F1 is constant, the greater α1, the greater the grass removal force F11, the better the grass removal effect, and the faster the grass clippings are discharged, reducing the probability of grass clippings clogging the cutting table 9.

[0162] In this embodiment, α1 is configured as an acute angle, so that the cutting edge 5 can effectively produce a cutting effect on the vegetation and generate a significant outward force on the broken grass, which is beneficial to the removal of the grass.

[0163] Furthermore, for ease of understanding, third straight line 8 is defined as perpendicular to cutting portion 3. Because the outer end of cutting portion 3 along first straight line 61 is lower than the inner end, that is, the upper surface of cutting portion 3 gradually decreases outward from rotation axis 63, in the A-direction cross-sectional diagram shown in FIG6 , the cross-sectional profile of cutting portion 3 forms an angle γ1 with first straight line 61. Based on the projection relationship, γ1 is numerically equal to the angle between the projection of third straight line 8 on second plane 72 and rotation axis 63.

[0164] Referring to Figures 6 and 7, the angle between the projection of the third straight line 8 in the second plane 72 and the rotation axis 63 is 0 to 10°. When the grass clippings collide with the cutting part 3, the normal collision force F2 of the contact surface (in the second plane 72) can be decomposed into an outward component F22 along the first straight line 61 and an upward component F21 along the rotation axis 63, wherein F21 = F2*sinγ1, F22 = F1*cosγ1, F22 is conducive to outward grass discharge, while F21 is conducive to the formation of an ascending airflow to absorb grass; theoretically, the larger the γ1 angle is, the easier it is to absorb air and discharge grass, but the γ1 angle will also increase the blade load and the difficulty of processing and forming. Therefore, in practice, the γ1 angle should also be determined by comprehensively considering the load and grass discharge effect. It is recommended to take it between 0 and 10°. The γ1 in this embodiment can be selected from 3°, 5°, 7°, and 9°. The above angle range of 0 to 10° is a reasonable suggestion based on current processing technology, but with the development of processing technology, the angle range can be appropriately increased, for example, the maximum angle can be selected as 11°, 12°, 13°, 14°, etc.

[0165] A blade 4 is provided in the rotational forward direction of the cutting portion 3. The blade 4 has a cutting edge 5 for cutting vegetation. The cutting edge 5 is parallel to the first plane 71. The first plane 71 is the rotation plane of the cutting blade. The cutting blade rotates within the first plane 71 when cutting vegetation and moves forward with the lawn mower. Therefore, maintaining a horizontal cutting edge 5 can ensure that the upper edge of the cut vegetation is flat.

[0166] It should be noted that the blade is a consumable part in the lawn mower, and the wear and tear caused to it during operation is relatively obvious, so the blade 4 needs to be sharpened at regular intervals. In this embodiment, since the cutting edge 5 of the blade 4 remains parallel to the first plane 71, it can still be effectively ensured that the cutting edge 5 continues to remain parallel to the first plane 71 after the blade 4 is sharpened. That is, after the sharpening is completed, the mowing operation can still ensure that the cutting height of the grass remains the same as before, and the grass remains flat after the operation is completed; therefore, the service life of a single blade can be extended and the user's usage cost can be reduced. Referring to Figure 4, the 0° marked in the figure means that the cutting edge 5 is parallel to the upper surface of the blade base 1, that is, parallel to the first plane 71.

[0167] If the cutting edge of the blade is not parallel to the rotation plane, the grass after the operation will appear jagged in the front and back directions, especially after the blade 4 is worn and polished; especially when the polishing degree of the two blades 4 is different, there will be obvious difference in the cutting height of the two blades 4, resulting in extremely poor flatness of the grass after the operation.

[0168] Referring to Figure 15 , two cutting blades are mounted on the cutting table 9 . The cutting blades are driven by a cutting motor to rotate in the direction indicated by the hollow arrow in the figure. The right side of the figure represents the grass discharge port, through which the grass cut by the two blades is discharged. This figure clearly shows that for the right-hand cutting blade (near the grass discharge port), a larger angle α1 results in better grass discharge efficiency. However, for the left-hand cutting blade (farther from the grass discharge port), a larger angle α1 reduces the tangential force F12 , potentially causing more grass cuts to be thrown onto the cutting table 9 housing rather than being transported to the right blade. This can lead to grass cuts clogging the cutting table 9 and increasing blade load. Therefore, the angle α1 needs to be determined by considering both load and grass discharge efficiency. The range of α1 is generally 0-45°. Experiments have shown that a range of 5-20° generally achieves optimal technical results. Preferably, α1 in this embodiment can be selected from 8°, 10°, 13°, or 15°, all of which achieve a relatively balanced load and grass discharge efficiency. Furthermore, two cutting blades with different α1 angles can be installed on the same cutting platform 9, wherein the α1 of the left cutting blade is smaller than that of the right cutting blade, so that grass removal can be completed more effectively.

[0169] The connecting edge between the connecting portion 2 and the blade base 1 is the first edge, and the connecting edge between the connecting portion 2 and the cutting portion 3 is the second edge. The first edge intersects with the second edge, or the extension line of the first edge intersects with the extension line of the second edge. The cutting blade of this embodiment is formed by bending a long strip of plate material. The first edge and the second edge are bending positions. The connecting portion 2 formed by the bending is an inclined plane, that is, the straight lines where the two bending positions are located are coplanar. In other embodiments, the first edge and the second edge may not be coplanar, that is, the straight lines where the two bending positions are located are not in the same plane, or the connecting portion 2 is a curved surface structure. Since its projection on the first plane 71 and the second plane 72 is still roughly the same, it does not have a significant impact on the actual mowing and weeding effects of the blade.

[0170] Referring to FIG. 5 , the projection of the connecting portion 2 on the first plane 71 is a triangle or trapezoid. If the intersection of the lines containing the first and second sides is at the edge of the cutting blade, the projection of the connecting portion 2 on the first plane 71 is a triangle. If the intersection of the lines containing the first and second sides is outside the range of the cutting blade, the projection of the connecting portion 2 on the first plane 71 is a trapezoid. Furthermore, if the intersection of the lines containing the first and second sides is within the range of the cutting blade, a notch should be provided in the direction opposite to the torsion of the blade. Otherwise, bending becomes too difficult and machining becomes difficult. After the notch is provided, the projection of the connecting portion 2 on the first plane 71 will still be a triangle.

[0171] The heights of various points on the second side are different, so the cutting blade can generate a vertical component of force on the grass during mowing operations, which helps to remove the grass. In this embodiment, referring to Figures 1 and 8, the forward rotation direction end 34 of the cutting part 3 is lower than the reverse rotation direction end 33 of the cutting part 3; wherein, the forward rotation direction is clockwise (expressed as a top view, the same below), and the reverse rotation direction is counterclockwise; the angle between the line connecting the forward rotation direction end 34 and the reverse rotation direction end 33 and the second straight line 62 is β1, and β1 is an acute angle; the cutting part 3 generates a force F3 (within the third plane 73) along the normal direction of the cutting part 3 to the cut grass. The force analysis shows that F3 is decomposed into a component force F31 upward along the rotation axis 63 and a component force F32 along the second straight line 62. Among them, F31 causes the grass cuts and air to move upward to form an updraft that gathers at the top of the cutting table 9, forming a negative pressure at the bottom of the cutting table 9 to facilitate the suction of the grass to be cut, and F32 causes the grass cuts and air to move in the direction of the second straight line 62 and be discharged in the grass discharge area. The area where the grass cuts are discharged also creates a negative pressure at the bottom of the cutting table 9 to facilitate the suction of the grass. Theoretically, the larger the β1 angle is, the easier it is to suck air and remove grass. However, the β1 angle will also increase the blade load and the difficulty of processing and forming. Therefore, in practice, the β1 angle should also be determined by comprehensively considering the load and grass removal effect. It is recommended to take it between 0 and 45°. In this embodiment, the β1 can be selected from 13°, 15°, 17°, 19°, and 21°.

[0172] It should be noted that the aforementioned force components F21 and F31 acting on the grass cutter 3 are actually the same force component, both of which act in the direction of the rotation axis 63. The distinction between F21 and F31 is merely for ease of description and understanding. This force component generates a negative pressure at the bottom of the cutting table 9, creating a grass suction effect. This force can shift the grass from an inclined or horizontal position to a vertical, upward position before being cut by the blades. This ensures a consistent remaining length of the lawn after trimming, resulting in a more even lawn.

[0173] The cutting blade in this embodiment includes two cutting sections 3, one on either side of the blade base 1. This means that each cutting section 3 produces a cutting action at the same location during one rotation of the blade. The cutting edges 5 of the two cutting sections 3 are coplanar, ensuring a smooth, even grass surface after cutting. The two cutting edges 5 are parallel and spaced 20 mm to 1110 mm apart. This distance is dependent on the aforementioned angle α1 and the length of the cutting blade. When α1 = 0, the spacing is the width of the blade, which is the minimum. When α1 = 90°, the spacing is the length of the blade, which is the maximum. Referring to Figure 5 , X represents the distance between the two cutting edges 5.

[0174] In the prior art, the cutting edge 5 of the blade is arranged at the lower edge of the blade. At this time, the cutting edge 5 that is parallel to the first plane 71 can only be composed of a single segment; in another embodiment, the cutting edge 5 is composed of several edges. This is because the blade itself has a certain thickness. By setting part of the edges at the non-lowermost edge of the blade, the technical effect of multiple edges being parallel to the first plane 71 at the same time is achieved, thereby slightly adjusting the load and grass removal effect of the cutting blade; at this time, the edges can be made into a straight structure or an arc structure.

[0175] The cutting portion 3 in the aforementioned embodiments is a straight-sided structure, but preparing it as a curved surface should not be understood as exceeding the scope of the present invention. It is only necessary to satisfy the aforementioned positional relationship. For details, please refer to Figure 9. In this embodiment, the cutting portion 3 is a curved surface, and the height change rate of the upper surface of the cutting portion 3 in the direction of the second straight line 62 is different; this change rate corresponds to the edge tangent of the cross section of the cutting portion 3, and the angle between the tangent and the second straight line 62 still meets the aforementioned range of β1 being less than 45°.

[0176] In summary, the existence of α1 and γ1 causes the blade to generate component forces F11 and F22 along the direction of the first straight line 61 on the grass clippings, which helps to discharge the grass clippings outward; since the blade will inevitably be affected by obstacles such as stones during operation, the component forces F11 and F22 can also make these obstacles quickly move away from the blade, shortening the friction process between the grass clippings, obstacles and the blade, which will significantly reduce the wear of the blade and thus increase the life of the blade.

[0177] In the prior art, the traditional straight blade refers to Figures 10-13. As can be seen from the figures, the cutting edge 5 of the straight blade is parallel to the first straight line 61, the normal of the cutting portion 3 of the straight blade is parallel to the third plane 73, and the end of the cutting portion 3 in the forward rotation direction is lower than the end of the cutting portion 3 in the reverse rotation direction; that is, when the traditional straight blade is performing a mowing operation, the cut grass is subjected to an upward upward force along the rotation axis 63, but is not subjected to a force along the first straight line 61. Therefore, the grass removal ability is obviously inferior to the aforementioned blade with α1 and γ1.

[0178] The cutting blade of the present invention (i.e., the bevel blade) and the straight blade of the prior art were subjected to CAE simulation respectively, wherein the cutting blade of the embodiment of the present invention has α=10°, β=17°, γ=3°, and a spacing X=52mm; the β of the straight blade of the prior art is 17°. The simulation conditions include: two identical blades are configured in the cutting table 9, the rotation speed is 3200rpm, and the grass discharge port is located on the right side of the cutting table 9. The simulation monitors the power consumption of the blades, the suction force at the bottom of the cutting table 9 (chassis suction force), and the flow rate at the grass discharge port (outlet flow rate); the installation method of the blades refers to Figures 14 and 15, Figure 14 is an exploded schematic diagram of the cutting table 9 equipped with a bevel blade, wherein the blade is mounted on the output shaft of the cutting motor by bolts; Figure 15 is a bottom view of the corresponding cutting table 9. Figures 1 and 2 are schematic diagrams of a push lawn mower and a riding lawn mower, respectively, and the cutting table 9 is installed at the lower part of the lawn mower.

[0179] The simulation data results are shown in the following table:

[0180] Table 1 Simulation results of straight blade

[0181] Table 2 Simulation results of inclined blade

[0182] Figures 16 and 17 are respectively comparative diagrams of the wind speed at the grass discharge outlet of a straight blade and an oblique blade at different angles during simulation; Figures 18 and 19 are respectively comparative diagrams of the chassis suction (negative pressure) at different angles for a straight blade and an oblique blade during simulation; Figures 20 and 21 are respectively comparative diagrams of the airflow velocity vector at 50 mm above the blade for a straight blade and an oblique blade at different angles during simulation; Figure 22 is a graph showing the total power consumption of the blades at different angles for a straight blade and an oblique blade during simulation of the two blades; Figure 23 is a graph showing the chassis suction at different angles for a straight blade and an oblique blade during simulation of the two blades; and Figure 24 is a graph showing the flow rate at the grass discharge outlet of a straight blade and an oblique blade during simulation of the two blades;

[0183] It can be clearly seen from the above drawings and tables that when the oblique blades of the present invention are used, the power consumption is significantly reduced because the blade on the left side away from the grass discharge port is easier to discharge grass; the load of the blade on the right side increases slightly because the grass on the left side is discharged too quickly, but the overall power consumption is still lower than that of the straight blade.

[0184] At the same speed of 3200 rpm, the straight blade consumes more power than the bevel blade. The suction (negative pressure) generated by the two blades on the chassis of the cutting table 9 is basically the same. The flow rate generated by the bevel blade at the grass discharge port is higher than that of the straight blade. Comprehensively comparing power consumption, chassis suction and grass discharge flow, the bevel blade has better grass collection performance and is more economical than the straight blade.

[0185] Different from the aforementioned embodiment, referring to Figures 25-31, in another embodiment, the outer end of the cutting portion 3 along the first straight line 61 is higher than the inner end, that is, the upper surface of the cutting portion 3 gradually rises outward from the rotation axis 63. Referring to Figure 27 and its partially enlarged Figure 28, in the figure, the radial outer end 35 of the cutting portion 3 along the first straight line 61 is higher than the radial inner end 36. When the grass contacts the upper surface of the cutting portion 3, the impact force of the cutting portion 3 on the grass has a component force along the first straight line 61 directed to the blade base 1, thereby causing the cut grass to gather inward.

[0186] At this point, the cutting edge 5 is tilted toward the forward rotational direction along the first straight line 61. Referring to FIG. 25 , the angle between the cutting edge 5 and the first straight line 61 is α3. When the blade rotates to cut the grass, the cutting force F5 is directed along the normal to the contact surface between the cutting edge 5 and the grass. This force can be decomposed into a force component F52 directed inward along the first straight line 61 and a force component F51 directed upward along the second straight line 62, where F52 = F5*sinα3 and F51 = F5*cosα3. Clearly, F52 is more conducive to inward grass gathering, while F51 is the force that pushes the grass clippings forward. Theoretically, when the cutting force F5 is constant, the greater α3, the greater the grass-gathering force F52, the better the grass-gathering effect, and the faster the grass clippings gather inward, causing the cut grass to move toward the blade base 1 and fall to the ground near the blade base 1.

[0187] Referring to Figure 29, in this embodiment, the end of the cutting part 3 in the forward rotation direction is also lower than the end of the cutting part 3 in the reverse rotation direction, that is, there is an angle β3; the cutting part 3 generates a force F7 (within the third plane 73) along the normal of the cutting part 3 on the cut grass, and its force analysis shows that F7 is decomposed into an upward component F71 along the rotation axis 63 and a component F72 along the second straight line 62, wherein F71 causes the cut grass and air to move upward to form an ascending airflow that gathers at the top of the cutting table 9, and forms a negative pressure at the bottom of the cutting table 9 to facilitate the suction of the grass to be cut, and F72 causes the cut grass and airflow to move toward the second straight line 62.

[0188] The upper wall of the connecting portion 2 is inclined outward and in the direction of rotation; as mentioned above, the grass clippings in this embodiment are gathered inward by the grass gathering force F52, refer to Figure 28, but when the grass clippings come into contact with the connecting portion 2, they will be subjected to the normal collision force F8 generated by the connecting portion 2, and F8 can be decomposed into a component force F82 outward along the first straight line 61 and a component force F81 upward along the second straight line 62; at this time, the grass clippings will roll in the area of ​​the cutting portion 3 and the connecting portion 2 and be repeatedly cut by the blades at the corresponding positions, so that the cut grass clippings become more crushed, greatly improving the grass clipping effect of the lawn mower.

[0189] The present invention further discloses a cutting blade different from the above-described one, which is also mounted on a cutting deck of a lawn mower. The cutting blade comprises a blade base 1, a connecting portion 2, a cutting portion 3, and a blade edge 4. The blade base 1 is configured to rotate about a rotation axis 63 driven by a cutting motor within a first plane 71. The connecting portion 2 is connected to one side of the blade base 1. The cutting portion 3 is connected to a side of the connecting portion 2 away from the blade base 1 along a first straight line 61. The first straight line 61 is the radial direction of the blade rotation. The blade edge 4 has a cutting edge 5 for cutting vegetation. The blade edge 4 is arranged in the forward direction of rotation of the cutting portion 3.

[0190] Referring to Figures 32-37, the cutting portion of this embodiment has two torsion axes relative to the blade base 1, the first torsion axis 13 is parallel to the first straight line 61, and the second torsion axis 14 is parallel to the rotation axis 63. The cutting portion is twisted around the first torsion axis 13 so that the blade edge is lower than the blade base 1, and the cutting portion 3 is twisted around the second torsion axis 14 so that the cutting edge 5 is not parallel to the first straight line 61; the two twists make the outer end and the inner end of the cutting portion 3 along the first straight line 61 not at the same height, that is, there is a height difference between the upper walls of the inner and outer ends, and the cutting edge 5 is parallel to the first plane 71.

[0191] Referring to Figures 32-34 , the direction of rotation of the cutting portion 3 about the second torsion axis 14 is the counter-rotational direction of the cutting blade for mowing. As shown in Figures 32 and 33 , the cutting blade in the figures includes two cutting portions 3 on the left and right, and the cutting edges 5 of the two cutting portions 3 are coplanar. The arrows at the first torsion axis 13 and the second torsion axis 14 in the figures indicate the corresponding torsion directions. The angle of rotation of the cutting portion 3 about the second torsion axis 14 is 0 to 45°, and the angle of rotation of the cutting portion 3 about the first torsion axis 13 is 0 to 45°. The outer end of the cutting portion 3 along the first straight line 61 is lower than the inner end. For a side view of the cutting blade at this time, refer to Figure 33 . The cutting blade obtained by this torsion direction has the angles α1, β1, and γ1 of the aforementioned embodiments, i.e., it achieves the same technical effects of facilitating grass removal and reducing power consumption. For a detailed analysis, refer to the aforementioned embodiments and will not be repeated here.

[0192] Referring to Figures 35-37 , the direction in which the cutting portion 3 is twisted about the second torsion axis 14 corresponds to the forward rotational direction of the cutting blade for mowing. As shown in Figures 35 and 36 , the cutting blade includes two left and right cutting portions 3 , with the cutting edges 5 of the two cutting portions 3 coplanar. The arrows at the first torsion axis 13 and the second torsion axis 14 in the figures indicate the corresponding torsion directions. The angle of twist of the cutting portion 3 about the second torsion axis 14 is 0 to 45°, and the angle of twist of the cutting portion 3 about the first torsion axis 13 is 0 to 45°. The outer end of the cutting portion 3 along the first straight line 61 is higher than the inner end. For a side view of the cutting blade at this point, see Figure 37 . The resulting cutting blade with this twisting direction exhibits the angles α3, β3, and γ3 described in the aforementioned embodiments, thereby enhancing the grass-chopping performance of the cutting blade.

[0193] It should be additionally explained that the projection of the first torsion axis 13 on the first plane 71 is located on the counter-rotation side of the forward-rotation edge 15 of the blade base 1. Referring to Figures 33 and 36, the counter-rotation side of the forward-rotation edge 15 corresponding to the cutting portion 3 on the right side of the figure is above the line indicated by the label "15". This is because if the projection of the first torsion axis 13 on the first plane 71 coincides with the forward-rotation edge 15, it cannot be guaranteed that the blade is lower than the blade base 1; if the projection of the first torsion axis 13 on the first plane 71 is located on the forward-rotation side of the forward-rotation edge 15, the twisting that causes the blade to be lower than the blade base 1 will cause the forward-rotation side of the cutting portion 3 to be higher than its counter-rotation side, which is not conducive to mowing.

[0194] Referring to Figures 33 and 36, the projection of the first torsion axis 13 corresponding to the cutting portion 3 on the right side of the figure on the first plane 71 is located on the counter-rotation side of the counter-rotation direction edge 16, that is, the first torsion axis 13 in the figure is above the line indicated by the number "16", and at this time more areas or even all areas of the cutting portion 3 are lower than the blade base 1.

[0195] If the projection of the first torsion axis 13 on the first plane 71 is located between the forward-rotating edge 15 and the reverse-rotating edge 16 , that is, the first torsion axis 13 is between the forward-rotating edge 15 and the reverse-rotating edge 16 , then the twisted cutting portion 3 is at least partially higher than the blade base 1 .

[0196] The present invention also discloses a composite knife, comprising any one of the above-mentioned cutting blades and a second blade, that is, a second blade is configured on the basis of the above-mentioned cutting blade, the original cutting blade is the first blade, and referring to Figures 38 and 39, the second blade arranged on the upper part of the first blade has a second edge, and the projection of the second edge on the first plane 71 is located in the reverse rotation direction of the blade 4 and is at least partially higher than the cutting part 3. The second blade and the cutting blade rotate around the same straight line when driven to perform mowing operations; during mowing operations, the first blade first contacts the grass and cuts it, and the cut grass moves upward along the cutting part 3 of the first blade and is then acted upon by the second blade, thereby achieving a more thorough effect of cutting the grass.

[0197] The second blade can be configured to be integrally formed with the first blade, for example, the base 1 of the first blade extends vertically upward to a certain height and then extends the cutting edge of the second blade outward; or another independent blade can be installed on the basis of the original first blade; it is only necessary to keep the two rotating synchronously to complete the grass chopping together.

[0198] The second blade can be configured with the same structure as the first blade, with an oblique blade having three angles of α, β, and γ, or a straight blade having only an angle of β in the prior art, or an ordinary blade not having the three angles of α, β, and γ as shown in Figures 38 and 39. The actual effect varies depending on the usage environment, but since the grass cut by the first blade can be repeatedly cut, the grass chopping effect will be significantly improved.

[0199] The present invention also discloses a lawn mower, comprising a frame 10, a drive system, a cutting table 9, a cutting motor, an energy source, and a control system. The drive system is connected to the frame 10 and is used to generate a driving force to rotate a drive wheel 11, thereby causing the lawn mower to move on the ground. The cutting table 9 is arranged at the lower part of the frame 10, and any one of the above-mentioned cutting blades or compound knives is installed in the cutting table 9. The energy source provides electrical energy to the drive system and the cutting motor in the cutting table 9. Specifically, the energy source can be a battery or a combination of a battery and an internal combustion engine. When the combination of the battery and the internal combustion engine is selected, the battery can simultaneously supply electrical energy to the drive system and the cutting motor, and the internal combustion engine provides electrical energy to supplement the battery. Alternatively, the battery can supply power to the cutting motor, and the internal combustion engine provides mechanical power to the drive system via a power transmission mechanism. Furthermore, the battery can also be discarded. In this case, the kinetic energy generated by the internal combustion engine is converted into electrical energy by a generator to supply power to the drive system and the cutting motor. The control system signal is connected to the drive system and the cutting table 9. The control system is controlled by the user and sends working signals to the drive system and the cutting table 9, so that the lawn mower completes the expected action.

[0200] Referring to Figures 1 and 2, the two tires in the forward direction of the lawn mower in the figures are driven wheels, and the two tires located at the rear side of the lawn mower are drive wheels 11. Because the drive system is closer to the drive wheel 11, and the drive system is close to the rear side of the lawn mower, the center of gravity of the entire vehicle is moved backward, and the front wheels (driven wheels) bear less gravity, reducing the probability of the front wheels crushing the grass to be trimmed to a point where it is difficult to trim, which helps to improve the flatness of the grass after mowing.

[0201] The above-mentioned control system, energy source, and drive system are all adaptively assembled on the frame 10. The control system includes a control module that controls the opening and closing of the drive system and a PTO switch that controls the opening and closing of the cutting motor. The control module can control the operation of the drive system so that the lawn mower can complete forward, backward, turning, braking, parking and other effects; the PTO switch controls the opening and closing of the cutting motor so that the lawn mower starts mowing when it reaches the working position under the action of the drive system.

[0202] The above-mentioned lawn mower also includes a lifting mechanism (not shown) arranged between the frame 10 and the cutting table 9. The lifting mechanism can drive the cutting table 9 to move up and down in a controlled manner to adjust the cutting height, which is suitable for different mowing needs; in addition, when the lawn mower is traveling in a non-working area, adjusting its height through the lifting mechanism can also effectively enhance the vehicle's passability and avoid the situation where the cutting table 9 is bumped due to uneven ground or debris such as stones.

[0203] Referring again to Figures 1 and 2, Figure 1 is a schematic diagram of a push lawn mower, and Figure 2 is a schematic diagram of a riding lawn mower. The cutting platform 9 is mounted on the lower portion of the mower. The riding lawn mower in Figure 2 also includes a seat 12 for the user. Because the cutting blades have three angles, α, β, and γ, they not only improve grass removal capabilities but also effectively reduce load, thus saving energy. All other conditions remaining unchanged, the mower's endurance is significantly improved. Furthermore, due to the presence of the α and γ angles, when obstacles such as relatively hard stones are present on the mower's cutting platform 9, a component force is generated along the first straight line 61, accelerating the removal of the obstacle, avoiding grass blockage and the resulting risk of blade overload, and significantly improving the mower's passing performance. When the mower is equipped with the aforementioned compound blade, the cut grass can continue to be cut by the second blade, pulverizing the grass more thoroughly.

[0204] In another optional embodiment, referring to FIG40 , the base of the cutting blade is further provided with a reinforcing rib 101. The rib extends at least partially along the first straight line to enhance the strength of the blade base. Specifically, at least a portion of the blade base protrudes from the original surface of the blade base, thereby significantly enhancing the blade base's anti-torsion strength and preventing bending deformation caused by weeds or other debris carried by the rotating blade.

[0205] In another optional embodiment, referring to FIG40 , the reinforcing rib includes a protrusion that at least partially protrudes from the surface of the blade base. This protrusion can enhance the strength of the corresponding portion of the blade. The reinforcing rib 101 shown on the cutting blade is implemented as a partially inward depression on one end surface of the blade base and an outward protrusion on the other end surface of the blade base, with the depression and protrusion located at corresponding positions. In this embodiment, both the depression and the protrusion create a plane at the reinforcing rib that is roughly parallel to the axis of rotation. The presence of this plane also increases the torsional strength of the blade base.

[0206] In another optional embodiment, referring to FIG40, the reinforcing ribs on the cutting blade include at least two sections arranged at angles to each other, that is, the two sections of reinforcing ribs do not extend in the same straight line direction, and their angled arrangement can also increase the strength of the corresponding position of the blade base.

[0207] In another optional embodiment, the cutting table on which the cutting blade is assembled has a first connecting member and a second connecting member respectively abutting against the two end faces of the cutting blade, and one of the first connecting member and the second connecting member partially overlaps with the protrusion in the direction of the rotation axis. With reference to Figures 30 and 41, Figure 41 shows a schematic diagram of the installation of a cutting blade with reinforcing ribs. Mark 17 in the figure is a blade holder connecting the rotating shaft and the cutting blade, mark 18 is a gasket, and mark 19 is a bolt. During installation, the blade holder 17 and gasket 18 are respectively located at the two ends of the cutting blade. The bolt 19 passes through the gasket 18, the cutting blade, and the blade holder 17 in sequence and is fastened to the rotating shaft, thereby achieving the technical effect of fixing the cutting blade to the rotating shaft. The rotating shaft here should be a rotating shaft that outputs torque to the cutting blade. It can be the output shaft of the cutting motor, or it can be a rotating shaft that indirectly transmits power from the cutting motor or other power source to the cutting blade.

[0208] In some of the more specific embodiments, the reinforcing rib extends to the blade seat at one end near the cutting blade rotation axis, but does not extend to the gasket, and the side of the reinforcing rib near the blade seat does not protrude outward from the surface of the blade base; correspondingly, the side of the reinforcing rib near the gasket protrudes outward from the surface of the blade base. Since the reinforcing rib does not extend to the gasket, that is, the protruding structure of the reinforcing rib does not directly contact the gasket, the reinforcing rib and the gasket are prevented from abutting against each other, resulting in the gasket being unable to form a good abutment effect with the blade base.

[0209] Conversely, if the operator accidentally installs the cutting blade upside down, the protruding rib will inevitably contact the blade holder, preventing the holder from properly contacting the blade base. The cutting blade will then not be properly installed, preventing the bolt from rotating to the intended position. A noticeable gap will also appear between the cutting blade and the blade holder, allowing the operator to easily detect and correct this problem. In short, the rib structure in this embodiment can cause the blade to be installed incorrectly, thus alerting the operator to the current reversed blade installation state and preventing subsequent mowing errors caused by the reversed blade installation.

[0210] The present invention is not limited to the above-described specific embodiments. Those skilled in the art will readily appreciate that many alternatives to the cutting blade of the present invention exist without departing from the principles and scope of the present invention. The scope of protection of the present invention shall be determined by the claims.

Claims

1. A cutting blade for a lawn mower, assembled on the cutting table of the lawn mower, characterized in that, Comprising: A blade base configured to rotate about a rotation axis in a first plane; A connecting portion connected to one side of the blade base; A cutting portion connected to the side away from the blade base of the connecting portion along a first straight line, the first straight line being the diameter direction of the blade rotation; A cutting edge disposed in the rotation advancing direction of the cutting portion; Defining: A second straight line is perpendicular to the first straight line and lies in the first plane, and the intersection of the first straight line and the second straight line coincides with the projection of the rotation axis in the first plane; A second plane passes through the first straight line and the rotation axis; A third plane passes through the second straight line and the rotation axis; A third straight line is perpendicular to the cutting portion; The outer end and the inner end of the cutting portion along the first straight line are not of equal height; The cutting edge has a cutting edge for cutting vegetation, and the cutting edge is parallel to the first plane but not parallel to the first straight line.

2. The cutting blade for a lawn mower according to claim 1, wherein: The outer end of the cutting portion along the first straight line is lower than the inner end, and the cutting edge is inclined toward the reverse rotation side along the first straight line direction.

3. The cutting blade for a lawn mower according to claim 1, characterized in that: The outer end of the cutting portion along the first straight line is higher than the inner end, and the cutting edge is inclined toward the forward rotation side along the first straight line direction.

4. The cutting blade for a lawn mower according to claim 1, characterized in that: The connecting edge of the connecting portion and the blade base is the first side, the connecting edge of the connecting portion and the cutting portion is the second side, and the first side intersects the second side or the extension line of the first side intersects the extension line of the second side.

5. The cutting blade for a lawn mower according to claim 4, characterized in that: The projection of the connecting portion in the first plane is triangular or trapezoidal.

6. The cutting blade for a lawn mower according to claim 1, wherein: The included angle between the projection of the third straight line in the second plane and the rotation axis is 0 to 10°.

7. The cutting blade for a lawn mower according to claim 1, characterized in that: The end portion of the cutting portion in the forward rotation direction is lower than the end portion of the cutting portion in the reverse rotation direction.

8. The cutting blade for a lawn mower according to claim 7, characterized in that: The included angle between the projection of the third straight line in the third plane and the rotation axis is 0 to 45°.

9. The cutting blade for a lawn mower according to claim 2 or 3, characterized in that: The included angle between the cutting edge and the first straight line is 0 to 45°.

10. The cutting blade for a lawn mower according to claim 9, characterized in that: The included angle between the cutting edge and the first straight line is 5 to 20°.

11. The cutting blade for a lawn mower according to claim 1, characterized in that: The cutting blade includes two cutting portions, and the cutting edges of the two cutting portions are coplanar.

12. The cutting blade for a lawn mower according to claim 11, characterized in that: Both of the two cutting edges are linear structures, and the straight lines where the two cutting edges are located are parallel to each other and the distance therebetween is 20 mm to 1110 mm.

13. The cutting blade for a lawn mower according to claim 1, characterized in that: The cutting edge is composed of a plurality of cutting edges, and the cutting edges are linear structures or arc-shaped structures.

14. A cutting blade for a lawn mower, assembled on the cutting table of the lawn mower, characterized in that, Comprising: A blade base configured to rotate about a rotation axis in a first plane; A connecting portion connected to one side of the blade base; A cutting portion connected to the side away from the blade base of the connecting portion along a first straight line, the first straight line being the diameter direction of the blade rotation; A cutting edge having a cutting edge for cutting vegetation, and the cutting edge is disposed in the rotation advancing direction of the cutting portion; The cutting portion has two torsion axes relative to the blade base, the first torsion axis is parallel to the first straight line, the second torsion axis is parallel to the rotation axis, the cutting portion twists around the first torsion axis to make the cutting edge lower than the blade base, and the cutting portion twists around the second torsion axis to make the cutting edge not parallel to the first straight line; The cutting edge is parallel to the first plane.

15. The cutting blade for a lawn mower according to claim 14, characterized in that: The connecting portion smoothly transitions to the cutting portion along the edge of the blade base.

16. The cutting blade for a lawn mower according to claim 14, characterized in that: The direction in which the cutting portion twists around the second torsion axis is the reverse rotation direction of the cutting blade for mowing grass, and the outer end of the cutting portion along the first straight line is lower than the inner end.

17. The cutting blade for a lawn mower according to claim 14, characterized in that: The direction in which the cutting part twists around the second torsion axis is the forward rotation direction for the cutting blade to mow grass, and the outer end of the cutting part along the first straight line is higher than the inner end.

18. The cutting blade for a lawn mower according to claim 14, characterized in that: The cutting blade includes two cutting parts, and the cutting edges of the two cutting parts are coplanar.

19. The cutting blade for a lawn mower according to claim 16 or 17, characterized in that: The angle by which the cutting part twists around the second torsion axis is 0 to 45°.

20. The cutting blade for a lawn mower according to claim 16 or 17, characterized in that: The angle by which the cutting part twists around the first torsion axis is 0 to 45°.

21. The cutting blade for a lawn mower according to claim 17, characterized in that: The projection of the first torsion axis on the first plane is located on the reverse rotation side of the forward rotation direction edge of the blade base.

22. The cutting blade for a lawn mower according to claim 21, characterized in that: The projection of the first torsion axis on the first plane is located between the forward rotation direction edge and the reverse rotation direction edge of the blade base.

23. The cutting blade for a lawn mower according to claim 21, characterized in that: The projection of the first torsion axis on the first plane is located on the reverse rotation side of the reverse rotation direction edge of the blade base.

24. The cutting blade for a lawn mower according to claim 22 or 23, characterized in that: The highest point of the connecting part in the direction of the cutting blade rotation axis is located in the first plane.

25. A composite knife for a lawn mower, characterized in that: It includes the cutting blade according to any one of claims 1 to 25 and a second blade. The second blade has a second edge located on the reverse rotation direction of the cutting edge and at least partially higher than the cutting part. The second blade and the cutting blade rotate around the same straight line when driven to perform mowing operations.

26. A lawn mower, characterized in that: It includes: A frame; A drive system, which is connected to the frame and is used to generate a driving force to make the lawn mower move on the ground; A cutting table, which is arranged below the frame, and the cutting table is equipped with a cutting blade; A cutting motor, which is assembled on the cutting table and is used to drive the cutting blade to rotate; An energy source, which is used to supply electrical energy to the drive system and the cutting motor in the cutting table; A control system, which is signal-connected to the drive system and the cutting table, and is used to control the walking of the lawn mower and the operation of the cutting motor to perform mowing actions; The cutting blade includes: A blade base, which is configured to rotate around a rotation axis in the first plane; A connecting part, which is connected to one side of the blade base; A cutting part, which is connected to the side of the connecting part away from the blade base along the first straight line, and the first straight line is the diameter direction of the blade rotation; A cutting edge, which is arranged in the forward rotation direction of the cutting part; The outer end and the inner end of the cutting part along the first straight line are not at the same height; The cutting edge has a cutting edge for cutting vegetation, and the cutting edge is parallel to the first plane but not parallel to the first straight line.

27. The lawn mower according to claim 26, characterized in that: The control system includes a control module for controlling the opening and closing of the drive system and a PTO switch for controlling the opening and closing of the cutting motor.

28. The lawn mower according to claim 26, characterized in that: It further includes a lifting mechanism arranged between the frame and the cutting table. The lifting mechanism can be controlled to drive the cutting table to move up and down to adjust the mowing height.

29. The cutting blade for a lawn mower according to claim 1, characterized in that: The blade base is provided with a reinforcing rib that at least partially extends substantially along the first straight line direction.

30. The cutting blade for a lawn mower according to claim 29, wherein: The reinforcing rib includes at least two sections arranged at an angle to each other.

31. The cutting blade for a lawn mower according to claim 29, characterized in that: The reinforcing rib has a protruding part that at least partially protrudes from the surface of the blade base.

32. The cutting blade for a lawn mower according to claim 31, characterized in that: The cutting table equipped with the cutting blade has a first connecting part and a second connecting part that respectively abut against the two end faces of the cutting blade. One of the first connecting part and the second connecting part partially coincides with the protruding part in the direction of the rotation axis.

33. A lawn mower, characterized in that: It includes: A frame; A drive system, which is connected to the frame and is used to generate a driving force to make the lawn mower move on the ground; A cutting table, which is arranged below the frame, and the cutting table is equipped with a cutting blade; A cutting motor, which is assembled on the cutting table and is used to drive the cutting blade to rotate; An energy source for supplying electrical energy to the drive system and the cutting motor in the cutter bar; A control system, signal-connected to the drive system and the cutter bar, for controlling the walking of the lawn mower and the operation of the cutting motor to perform the mowing action; The cutting blade includes: A blade base configured to rotate about a rotation axis in a first plane; A connecting portion connected to one side of the blade base; A cutting portion connected to the side of the connecting portion away from the blade base along a first straight line, the first straight line being the diameter direction of the blade rotation; A cutting edge having a cutting edge for cutting vegetation, the cutting edge being disposed in the rotation advancing direction of the cutting portion; The cutting portion has two torsion axes relative to the blade base, a first torsion axis parallel to the first straight line, and a second torsion axis parallel to the rotation axis. The cutting portion rotates about the first torsion axis to lower the cutting edge below the blade base, and the cutting portion rotates about the second torsion axis to make the cutting edge non-parallel to the first straight line; The cutting edge is parallel to the first plane.

34. The lawn mower according to claim 29, wherein: The control system includes a control module for controlling the opening and closing of the drive system and a PTO switch for controlling the opening and closing of the cutting motor.

35. The lawn mower according to claim 29, wherein: It further includes a lifting mechanism disposed between the frame and the cutter bar, and the lifting mechanism can be controlled to drive the cutter bar to move up and down to adjust the mowing height.

36. A lawn mower, characterized in that: It includes: A frame; A drive system connected to the frame and used to generate a driving force to make the lawn mower move on the ground; A cutter bar disposed below the frame, and a composite knife is assembled in the cutter bar; A cutting motor assembled in the cutter bar and used to drive the composite knife to rotate; An energy source for supplying electrical energy to the drive system and the cutting motor in the cutter bar; A control system, signal-connected to the drive system and the cutter bar, for controlling the walking of the lawn mower and the operation of the cutting motor to perform the mowing action; The composite knife includes a cutting blade and a second blade, and the cutting blade includes: A blade base configured to rotate about a rotation axis in a first plane; A connecting portion connected to one side of the blade base; A cutting portion connected to the side of the connecting portion away from the blade base along a first straight line, the first straight line being the diameter direction of the blade rotation; A cutting edge disposed in the rotation advancing direction of the cutting portion; The outer end and the inner end of the cutting portion along the first straight line are not at the same height; The cutting edge has a cutting edge for cutting vegetation, and the cutting edge is parallel to the first plane but not parallel to the first straight line; 37. A lawn mower, characterized in that: The second blade has a second cutting edge located in the reverse rotation direction of the cutting edge and higher than the cutting portion, and the second blade and the cutting blade rotate about the same straight line when driven to perform the mowing operation. It includes: A frame; A drive system connected to the frame and used to generate a driving force to make the lawn mower move on the ground; A cutter bar disposed below the frame, and a composite knife is assembled in the cutter bar; A cutting motor assembled in the cutter bar and used to drive the composite knife to rotate; An energy source for supplying electrical energy to the drive system and the cutting motor in the cutter bar; A control system, signal-connected to the drive system and the cutter bar, for controlling the walking of the lawn mower and the operation of the cutting motor to perform the mowing action; The composite knife includes a cutting blade and a second blade, and the cutting blade includes: A blade base configured to rotate about a rotation axis in a first plane; A connecting part, which is connected to one side of the blade base; A cutting part, which is connected to the side away from the blade base of the connecting part along a first straight line, and the first straight line is the diameter direction of the blade rotation; A cutting edge, which has a cutting edge for cutting vegetation, and the cutting edge is arranged in the rotation advancing direction of the cutting part; The cutting part has two torsion shafts relative to the blade base. The first torsion shaft is parallel to the first straight line, and the second torsion shaft is parallel to the rotation shaft. The cutting part rotates around the first torsion shaft to make the cutting edge lower than the blade base, and the cutting part rotates around the second torsion shaft to make the cutting edge not parallel to the first straight line; The cutting edge is parallel to the first plane; The second blade is provided with a second cutting edge located in the reverse rotation direction of the cutting edge and higher than the cutting part, and the second blade and the cutting blade rotate around the same straight line when driven to perform mowing operations.

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