WO2023060389A1

WO2023060389A1 - Blade, cutter head assembly, and lawn mower

Info

Publication number: WO2023060389A1
Application number: PCT/CN2021/123070
Authority: WO
Inventors: 邹伟; 王健; 靳思宇
Original assignee: 广东美的白色家电技术创新中心有限公司; 美的集团(上海)有限公司; 美的集团股份有限公司
Priority date: 2021-10-11
Filing date: 2021-10-11
Publication date: 2023-04-20
Also published as: CN118042923A

Abstract

A blade (1, 1'), comprising a blade body (11). One side of the blade body (11) is provided with a first blade edge (13, 13') extending in the length direction of the blade body (11); the first blade edge (13, 13') comprises a concave arc segment (131); a first end (16) of the blade body (11) in the length direction is provided with a first connection portion (12) configured to be connected to a cutter head (2, 2').

Description

Blade, disc assembly and lawn mower

technical field

This document relates to, but is not limited to, a blade, deck assembly and lawn mower.

Background technique

Lawn mowing robot is a new category developed on the basis of traditional lawn mowers, which can independently complete the work of mowing the lawn without direct human control and operation. Mowing robots generally have functions such as automatic mowing, cleaning grass clippings, automatic rain shelter, automatic walking, automatic obstacle avoidance, electronic virtual fence, automatic return charging, network control, etc., suitable for lawn trimming in home gardens, public green spaces, etc. maintain.

Mowing robots not only have the advantages of simple operation and high mowing efficiency, but also can automatically complete the mowing tasks, reduce labor costs and time costs, and also have the advantages of safety, no noise, and high intelligence. It has become the main development of the lawn mower industry. direction.

Summary of the invention

The following is an overview of the topics described in detail in this article. This summary is not intended to limit the scope of the claims.

A blade, comprising a blade body, one side of the blade body is provided with a first cutting edge extending along the length direction of the blade body, the first cutting edge includes a concave arc segment, and the length of the blade body along the length direction The first end is provided with a first connecting portion for connecting with the cutter head.

A cutterhead assembly, comprising: a cutterhead and the above-mentioned blade, the first connecting portion of the blade is connected to the cutterhead.

A lawn mower comprises a machine body and the above-mentioned cutter head assembly, the cutter head of the cutter head assembly is connected with the body, and the cutter head assembly is configured to be rotatable.

Other aspects will be apparent to others upon reading and understanding the drawings and detailed description.

Figure overview

The accompanying drawings are used to provide a further understanding of the technical solutions herein, and constitute a part of the description, and are used together with the embodiments of the application to explain the technical solutions herein, and do not constitute limitations to the technical solutions herein.

Fig. 1 is the structural representation of the blade of the mower in some cases;

Fig. 2 is the three-dimensional structure schematic diagram of the blade of the embodiment of the present application;

Fig. 3 is a front view structural schematic diagram of the blade shown in Fig. 2;

Fig. 4 is a three-dimensional structural schematic diagram of a cutter head assembly according to an embodiment of the present application;

Fig. 5 is a front structural schematic diagram of the cutter head assembly shown in Fig. 4;

Fig. 6 is a three-dimensional structural schematic diagram of the cutterhead of the cutterhead assembly shown in Fig. 4;

Fig. 7 is a front structural schematic view of the cutter head shown in Fig. 6;

FIG. 8 is a schematic perspective view of a three-dimensional structure of a cutter head assembly according to another embodiment of the present application;

FIG. 9 is a schematic front view of the cutter head assembly shown in FIG. 8 .

Wherein, the corresponding relationship between reference numerals and component names in Fig. 1 to Fig. 9 is:

1, 1'-blade, 11-blade body, 12-first connecting part, 13, 13'-first blade, 131-concave arc, 132-straight line, 14, 14'-second blade, 141- Concave arc segment, 142-straight line segment, 15-cylindrical surface, 16-first end, 17-second end, 18-first side, 19-second side,

2. 2'-cutter head, 21-disc body, 22-installation arm, 221-curved part, 222-second connecting part, 223-threaded hole.

detail

Embodiments of the application will be described below with reference to the accompanying drawings. It should be noted that, in the case of no conflict, the embodiments in the present application and the features in the embodiments can be combined arbitrarily with each other.

The embodiment of the present application provides a blade 1, which can be applied to a lawn mower or other products to realize functions such as mowing grass.

As shown in Figure 2 and Figure 3, this blade 1 can comprise blade body 11, and one side (namely first side 18) of blade body 11 can be provided with first cutting edge 13, and first cutting edge 13 can be along the length of blade body 11 direction extension. The first blade 13 can be used for cutting, such as mowing grass and the like. The blade body 11 also has a second side 19 opposite the first side 18 .

The first blade 13 includes a concave arc section 131 , which connects any two points on the concave arc section with a line segment, and other points of the line segment except the end point all fall in the space outside the blade main body 11 .

The first end 16 along the length direction of the blade main body 11 can be provided with a first connecting portion 12, and the first connecting portion 12 is configured to be connectable with the cutter head 2 (as shown in FIGS. 4 and 5 ), so that the blade 1 and The cutter heads 2 are connected to form a cutter head assembly. The blade body 11 also has a second end 17 opposite to the first end 16 , and the first end 16 and the second end 17 are respectively located at two ends of the first cutting edge 13 in the length direction.

Along the direction from the first end 16 to the second end 17 of the blade body 11 (ie along the length direction of the blade body 11 ), the concave arc section 131 is bent away from the second side 19 of the blade body 11 .

In some cases, as shown in Figure 1, the blade 11' is elongated (rectangular), and is edged on two long sides of the blade 11' to form a first blade 13' and a second blade 14', the first blade 13' and the second blade 14' are straight blades. In the embodiment of the present application, the setting of the concave arc section 131 is compared with the elongated blade 11' shown in FIG. The length of the blade 13' and the second blade 14' is longer, so the cutting range is larger; in addition, the setting of the concave arc section 131 makes the width W2 of the second end 17 of the blade body 11 larger than the first end 16 of the blade body 11 The width W1 makes the weight of the second end 17 of the blade body 11 larger, and the center of gravity of the blade body 11 moves toward the second end 17 of the blade body 11, so that the centrifugal force is greater when the blade 1 rotates, and the mowing efficiency is higher.

In some exemplary embodiments, as shown in FIG. 2 and FIG. 3 , the concave arc segment 131 may be a circular arc segment. It should be understood that the concave arc segment 131 may also be in other shapes, such as an elliptical arc and the like.

In some exemplary embodiments, as shown in FIG. 2 and FIG. 3 , the first blade 13 may further include a straight section 132, one end of the straight section 132 is smoothly connected with one end of the concave arc section 131, and the straight section 132 is arranged close to the blade At the first end 16 of the main body 11 , the concave arc section 131 is disposed close to the second end 17 of the blade main body 11 .

The first blade 13 includes a straight line section 132 arranged near the first end 16 of the blade body 11 and a concave arc section 131 arranged near the second end 17 of the blade body 11. The straight line section 132 is smoothly connected with the concave arc section 131, so that the first The overall streamlined shape of the blade 13 is harmonious and smooth, which is conducive to mowing grass. In addition, the concave arc segment 131 that is arranged near the second end 17 of the blade body 11 helps to hook the grass that the second end 17 of the blade body 11 contacts toward the first end 16 of the blade body 11, so that the first blade 13 Grass for cutting.

It should be understood that the first cutting edge 13 can also be a concave arc segment as a whole, excluding the straight segment, and the concave arc segment can extend from the second end 17 of the blade body 11 to the first end 16 of the blade body 11 .

In some exemplary embodiments, as shown in FIG. 3 , the size of the blade body 11 along the direction from the first end 16 toward the second end 17 is the length of the blade body 11, and the width direction of the blade body 11 is the same as the width of the blade body 11. The length direction is vertical. Wherein, the length of the blade main body 11 is L, the radius of the concave arc section 131 (that is, the radius of the circle where the concave arc section 131 is located) is R2, and R2 is 1/3-1/2 of L, that is, the value range of R2 is 1/3L-1/2L, so that the overall shape of the blade 1 is harmonious and smooth.

In some exemplary embodiments, the length L of the blade body 11 is 30mm-50mm, such as: 35mm, 38mm, 40mm, 42mm, 45mm, 48mm and so on. The radius R2 of the concave arc section 131 is 10mm-25mm, such as: 12mm, 15mm, 18mm, 20mm, 23mm and so on. In an exemplary embodiment, the length L of the blade body 11 is about 39.5 mm, and the radius R2 of the concave arc section 131 is about 15 mm.

In some exemplary embodiments, the central angle corresponding to the concave arc segment 131 can be set to be no greater than 90°, such as 90°, 87°, 85°, 83°, 80°, 77°, 75°, 73° , 70°, 67°, 65°, 63°, 60°, etc.

Of course, the length L of the blade body 11 , the radius R2 of the concave arc section 131 , the relationship between L and R2 , and the central angle corresponding to the concave arc section 131 are not limited to the aforementioned ranges, and can be adjusted according to actual needs.

In some exemplary embodiments, as shown in FIGS. 2 and 3 , the end surface of the second end 17 of the blade body 11 may be a cylindrical surface. Wherein, the cylindrical surface can be a cylindrical surface 15 . It should be understood that the cylindrical surface may also be in other shapes, such as an elliptical cylindrical surface and the like.

The end surface of the second end 17 of the blade main body 11 is a cylindrical surface 15, which makes the appearance of the blade main body 11 beautiful. In addition, as shown in Figure 4 and Figure 5, when a plurality of blades 1 are installed on the cutter head 2, the cylindrical surfaces 15 of the plurality of blades 1 can be located on the same cylinder, that is, the diameter of the plurality of cylindrical surfaces 15 (where the cylindrical surface 15 is located) The diameter of the cylinder) is equal, the central axis of a plurality of cylindrical surfaces 15 (the central axis of the cylinder where the cylindrical surface 15 is located) coincides, and the central axis of a plurality of cylindrical surfaces 15 can coincide with the central axis (rotation axis) of the cutterhead 2 , the diameter of the cylindrical surface 15 of a plurality of blades 1 is exactly the mowing width of cutter head assembly like this. The larger the diameter of the cylindrical surface 15, the wider the mowing width. Therefore, the larger the diameter of the cylindrical surface 15, the better, but limited by the size of the lawnmower itself and the chassis structure, as well as the power of the motor, battery capacity and other factors, the diameter of the cylindrical surface 15 is usually controlled within a certain range. Such as within 300mm. In some exemplary embodiments, the diameter (2×R1) of the cylindrical surface 15 may be 150mm-300mm, for example, the diameter of the cylindrical surface 15 may be 170mm, 200mm, 240mm, 280mm, etc. It should be understood that the diameter of the cylindrical surface 15 is not limited to 150mm-300mm, and can be set to be smaller than 150mm or larger than 300mm according to actual needs.

It should be understood that the end surface of the second end 17 of the blade body 11 is not limited to be the cylindrical surface 15 , for example, the end surface of the second end 17 of the blade body 11 may be a plane.

In some exemplary embodiments, as shown in FIGS. 2 and 3 , the second side 19 of the blade body 11 is provided with a second edge 14, and the second edge 14 and the first edge 13 are relative to the central axis of the blade body 11 (such as Shown by dotted line in Fig. 3) Symmetrical setting. As shown in Figures 2 and 3, the same structure as the first blade 13, the second blade 14 includes a concave arc segment 141 and a straight line segment 142, the straight segment 132 and the straight segment 142 are parallel, the concave arc segment 131 and the concave arc segment 141 The arrangement makes the blade body 11 overall T-shaped.

The setting of the second blade 14 enables the blade 1 to cut in both directions, so that the blade 1 can be used to mow grass when the cutter head 2 rotates clockwise or counterclockwise, which improves the practicability of the cutter body. The second blade 14 is arranged symmetrically with the first blade 13 . This makes the overall structure of the blade main body 11 symmetrical, beautiful and easy to manufacture.

As shown in Figures 2 and 3, the end face of the second end 17 of the blade body 11 is a cylindrical surface 15, the first blade 13 includes a straight line segment 132 and a concave arc segment 131 connected smoothly, and the second blade 14 includes a straight line connected smoothly Section 142 and concave arc section 141, so that the entire blade 1 has a streamlined shape.

In some exemplary embodiments, as shown in FIGS. 2 and 3 , the end surface of the first end 16 of the blade body 11 may be a plane. Of course, the end surface of the first end 16 of the blade main body 11 is not limited to being a plane, and can be configured as a cylindrical surface or other shapes as required.

In some exemplary embodiments, as shown in FIG. 2 and FIG. 3 , the blade body 11 is a flat plate as a whole.

In some exemplary embodiments, the thickness of the blade body 11 is 0.5mm-1mm, such as the thickness of the blade body 11 can be 0.55mm, 0.6mm, 0.65mm, 0.7mm, 0.75mm, 0.8mm, 0.85mm, 0.9mm, 0.95mm.

The thickness of the blade body 11 is 0.5mm-1mm, so that the thickness of the blade body 11 will not be too thin to cause the blade body 11 to crack or chip, and at the same time, it can avoid the large amount of material used in the blade body 11 caused by the thickness of the blade body 11 , heavy weight, high cost, and low mowing efficiency.

It should be understood that the thickness of the blade body 11 is not limited to 0.5mm-1mm, and can be set to be less than 0.5mm or greater than 1mm according to actual needs.

In some exemplary embodiments, the blade body 11 is made of stainless steel, stainless iron or manganese steel, so that the blade body 11 has high strength, is not easy to corrode and rust, and has a long service life.

It should be understood that the material of the blade body 11 is not limited to the above-mentioned stainless steel, stainless iron or manganese steel, and other materials with high strength and not easy to corrode and rust can also be selected.

In some exemplary embodiments, as shown in FIG. 2 and FIG. 3 , the first connecting portion 12 of the blade body 11 is a screw hole, so that the blade 1 can be connected to the cutterhead 2 by screws.

In some exemplary embodiments, as shown in FIG. 2 and FIG. 3 , the overall blade 1 is arranged symmetrically with respect to the central axis of the blade body 11 (as shown by the dotted line in FIG. 3 ).

The embodiment of the present application provides a cutter head assembly, which can be used in a lawnmower or other products. As shown in FIG. 4 and FIG. 5 , the cutterhead assembly may include a cutterhead 2 and the blade 1 provided in any of the above-mentioned embodiments, and the first connecting portion 12 of the blade 1 is connected to the cutterhead 2 .

In the cutter head assembly, the first connecting part 12 of the blade 1 can be connected with the cutter head 2 to realize the installation of the blade 1 to the cutter head 2, and the cutter head 2 can be rotated to drive the blade 1 to rotate to realize mowing and the like.

In some exemplary embodiments, there are a plurality of blades 1 (such as three to six), and they are evenly distributed along the circumferential direction of the cutter head 2 . As shown in FIG. 4 and FIG. 5 , there are three blades 1 , and the three blades 1 are evenly distributed along the circumference of the cutter head 2 , and the angle between two adjacent blades 1 is 120°.

It should be understood that the number of blades 1 in the cutterhead assembly is not limited to three to six, and can also be adjusted as required.

In some exemplary embodiments, the central axis of the cylindrical surface 15 of the second end 17 of the blade 1 is collinear with the central axis of the cutter head 2, the central axis of the cutter head 2 is the rotation axis of the cutter head 2, and the cutter head 2 can rotate around The axis of rotation makes a turn. As shown in Figure 5, the central axes of the cylindrical surfaces 15 of the second ends of the plurality of blades 1 are all collinear with the central axis of the cutter head 2, and the diameters of the cylindrical surfaces 15 of the second ends of the plurality of blades 1 are equal, so that the plurality of The cylindrical surface 15 of the blade 1 can be located on the same cylinder, and the diameter of this cylinder is the diameter of the cutting circle of the entire cutter head assembly, and the diameter of this cylinder is exactly the mowing width of the cutter head assembly.

In some exemplary embodiments, as shown in Figures 8 and 9, the cutter head 2' includes a disc body 21, which may be substantially a circular disc, and the first end 16 of the blade 1 may be connected to the edge of the disc body 21.

In other exemplary embodiments, as shown in FIGS. 4-7 , the cutter head 2 includes a disc body 21 and a mounting arm 22 , the mounting arm 22 extends radially outward from the disc body 21 , and the mounting arm 22 is connected to the blade 1 . Wherein, the disc body 21 can be roughly a disc, one end of the mounting arm 22 is connected to the edge of the disc body 21, and the other end extends outward along the radial direction of the disc body 21, and the first connecting portion of the mounting arm 22 and the blade 1 12 connections.

The disc body 21 of the blade 1 can be connected with the rotating motor of the mower, so that the rotating motor drives the disc body 21 to rotate, and then drives the blade 1 mounted on the mounting arm 22 to rotate to realize mowing. The arrangement of the mounting arm 22 extending radially outward makes it possible to reduce the diameter of the disc body 21 under the condition that the mowing width of the cutter head assembly remains unchanged, which is conducive to reducing the material consumption of the cutter head 2 and reducing the The weight of the cutter head 2 and the low cost of the lower cutter head 2; in addition, it also helps to reduce the contact area between the cutter head 2 and the grass when it is working, and reduces the resistance of the cutter head 2 during work, making it easy for the blade 1 to cut the grass , high mowing efficiency and helps to reduce working noise.

In some exemplary embodiments, as shown in FIG. 6 and FIG. 7 , the mounting arm 22 of the cutter head 2 is integrally formed with the disc body 21, so that the mounting arm 22 and the disc body 21 are integrally structured, and the mounting arm 22 and the disc body 21 are integrally formed. The connection between them is firm, which is conducive to enhancing the structural strength of the cutter head 2 itself, thereby enhancing the connection strength between the cutter head 2 and the blade, and the connection strength between the cutter head 2 and the rotating motor. In addition, the mounting arm 22 and the disc body 21 are integrally formed, which is beneficial to reduce the number of components, simplify assembly operations, and improve assembly efficiency.

In some exemplary embodiments, as shown in FIG. 4 and FIG. 7 , the mounting arm 22 includes a bent portion 221 and a second connecting portion 222 , one end of the bent portion 221 is connected to the disc body 21 , and the other end is connected to the second connecting portion 222 , the blade 1 is connected to the second connecting portion 222 and located on one side of the second connecting portion 222 , and the curved portion 221 bends toward the side of the disc body 21 where the blade 1 is located.

As shown in FIG. 4 , one end of the curved portion 221 of the mounting arm 22 is connected to the edge of the disc body 21 , and the other end is connected to the second connecting portion 222 . One side (as the lower side among Fig. 4), promptly cutterhead 2 is positioned at the upper side of blade 1, so that the blade 1 of lower side mows. The curved portion 221 is curved toward the side where the blade 1 is located, that is, the curved portion 221 is curved toward the lower side, so that an avoidance space can be formed on the upper side of the curved portion 221, so that when the cutter head assembly is used for the lawn mower, the Other components are avoided, such as the protective cover on the upper side of the cutterhead 2 is avoided.

In some exemplary embodiments, the blade 1 and the cutter head 2 are connected by screws. As shown in Figures 4 and 5, the first connecting portion 12 of the blade 1 may include a screw hole, the second connecting portion 222 of the mounting arm 22 of the cutter head 2 is provided with a stud, and a threaded hole 223 is provided in the stud, The screw can pass through the screw hole of the blade 1 and be screwed into the threaded hole 223 to realize the screw connection of the blade 1 and the cutter head 2 .

An embodiment of the present application provides a lawn mower, which includes a body and the cutterhead assembly provided in any one of the above embodiments. The cutterhead 2 of the cutterhead assembly is connected to the body, and the cutterhead assembly is configured to be rotatable.

In the lawn mower, the body may include a rotating motor, and the rotating motor may be connected to the cutter head 2 of the cutter head assembly. When the lawn mower starts mowing work, the rotary motor drives the cutter head 2 to rotate at a high speed, and then drives the blade 1 to throw away, and mows in the circumferential direction.

In some exemplary embodiments, the lawn mower can be a lawn mowing robot that can complete mowing autonomously. The lawn mowing robot can realize automatic walking, automatic mowing, automatic obstacle avoidance, automatic return and charging, etc., without direct human control and operation .

The cutter head 2 and the blade 1 of the embodiment of the present application can be applied to other lawn mowing equipment such as a lawn mowing robot in addition to being applied to a lawn mower.

In summary, the blade designed in the embodiment of the present application can effectively reduce the resistance encountered when mowing the grass, make it easier to cut the grass, and improve the mowing efficiency; The contact area further reduces the resistance when mowing, improves the mowing efficiency and effectively reduces noise.

In the description herein, it should be noted that the terms "upper", "lower", "one side", "another side", "one end", "another end", "side", "opposite", "four corners" ", "periphery", "mouth" character structure" and other indicated orientation or positional relationship are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing this article and simplifying the description, rather than indicating or implying the Structures have particular orientations, are constructed and operate in particular orientations, and thus are not to be construed as limiting herein.

In the description herein, it should be noted that the term "plurality" refers to two or more.

In the description of the embodiments of this application, unless otherwise specified and limited, the terms "connection", "fixation", and "installation" should be interpreted in a broad sense. For example, "connection" can be a fixed connection or an optional Detachable connection, or integral connection; may be directly connected, may also be indirectly connected through an intermediary, or may be internal communication of two elements. Those of ordinary skill in the art can understand the specific meanings of the above terms herein in specific situations.

Although the implementations disclosed herein are as above, the content described is only the implementations adopted to facilitate the understanding of this article, and is not intended to limit this article. Anyone skilled in the field of this article can make any modifications and changes in the form and details of the implementation without departing from the spirit and scope disclosed herein. shall prevail as defined in the claims.

Claims

A blade, comprising a blade body, one side of the blade body is provided with a first cutting edge extending along the length direction of the blade body, the first cutting edge includes a concave arc segment, and the length of the blade body along the length direction The first end is provided with a first connecting portion for connecting with the cutter head.
The blade according to claim 1, wherein the first cutting edge further comprises a straight section, the straight section is smoothly connected with one end of the concave arc section, the straight section is close to the first end of the blade body, The concave arc segment is adjacent to a second end of the blade body opposite to the first end.
The blade according to claim 2, wherein the concave arc segment is a circular arc segment.
The blade according to claim 3, wherein the radius of the concave arc section is 1/3-1/2 of the length of the blade body.
The blade according to any one of claims 1 to 4, wherein the end surface of the second end of the blade body opposite to the first end is a cylinder or a plane.
The blade according to any one of claims 1 to 4, wherein the end surface of the second end of the blade body is a cylindrical surface, and the diameter of the cylindrical surface is 150mm-300mm.
The blade according to any one of claims 1 to 4, wherein the blade body is further provided with a second cutting edge, and the second cutting edge and the first cutting edge are arranged symmetrically with respect to the central axis of the blade body.
The blade according to any one of claims 1 to 4, wherein the blade body is T-shaped.
The blade according to any one of claims 1 to 4, wherein the length of the blade body is 30mm-50mm, and/or the thickness of the blade body is 0.5mm-1mm.
A cutterhead assembly, comprising: a cutterhead and the blade according to any one of claims 1 to 9, the first connecting portion of the blade is connected to the cutterhead.
The cutterhead assembly of claim 10, wherein the central axis of the cylindrical surface of the second end of the blade is collinear with the central axis of the cutterhead.
The cutterhead assembly according to claim 11, wherein a plurality of said blades are provided and uniformly distributed along the circumferential direction of said cutterhead, and the diameters of the cylindrical surfaces at the second ends of the plurality of said blades are equal.
The cutterhead assembly of claim 10, wherein the cutterhead includes a disk body and a mounting arm extending radially outward from the disk body, the mounting arm being connected to the blade.
The cutter head assembly according to claim 13, wherein the mounting arm includes a bent portion and a second connecting portion, one end of the bent portion is connected to the disc body, and the other end is connected to the second connecting portion, The blade is connected to the second connecting portion and is located on one side of the second connecting portion, and the curved portion is bent toward the side of the disc where the blade is located.
The cutterhead assembly of claim 13, wherein the mounting arm is integrally formed with the disk body.
The cutterhead assembly according to any one of claims 10 to 15, wherein the blades are connected to the cutterhead by screws.
A lawn mower, comprising a body and the cutter head assembly according to any one of claims 10 to 16, the cutter head of the cutter head assembly is connected to the body, and the cutter head assembly is configured to be rotatable.