Mower and mowing method thereof

Abstract

To enable prevention of grass mowed by a mowing blade from being entangled with a mowing shaft.SOLUTION: A mower includes: a body part; a drive part which is provided in the body part; a mowing blade shaft which penetrates a lower surface of the body part, extends downward from the lower surface, and rotates by a drive force of the drive part; a mowing blade disc which is connected to a lower end portion of the mowing blade shaft, and rotates around the mowing blade shaft, and to which a mowing blade for mowing grass is supported; and a shaft protection cover which covers an outer periphery of a lower side portion of the mowing blade shaft extending out and exposed from the lower surface of the body part.SELECTED DRAWING: Figure 5

Description

[Technical field]

[0001] The present disclosure relates to a grass mower and a grass mowing method. [Background technology]

[0002] There is known a grass cutter that includes a main body, a drive unit provided on the main body, a blade shaft that rotates by the drive force of the drive unit, and a blade disk that is connected to the lower end of the blade shaft, rotates around the blade shaft, and supports a blade for cutting grass (see, for example, Patent Document 1). [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2019-149995 A Summary of the Invention [Problem to be solved by the invention]

[0004] However, when the blade shaft rotates and the grass is cut by the blade, there is a risk that the cut grass may become entangled in the blade shaft.

[0005] The present disclosure has been made to solve such problems, and has as its main object to provide a grass cutter and a grass cutting method that can prevent grass cut by the blade from becoming entangled in the blade shaft. [Means for solving the problem]

[0006] In order to achieve the above object, one aspect of the present disclosure is to A main body portion, A drive unit provided in the main body unit; a cutting blade shaft that penetrates a lower surface of the main body, extends downward from the lower surface, and is rotated by a driving force of the driving unit; a blade disk connected to a lower end of the blade shaft, rotating about the blade shaft, and supporting a blade for cutting grass; a shaft protection cover that covers an outer periphery of a lower portion of the blade shaft that is exposed from a lower surface of the main body; Equipped with It's a lawnmower. In this embodiment, a cylindrical housing fixed to a base plate on a lower surface of the main body; a bearing provided on an inner periphery of the housing and supporting the cutting blade shaft; a ring-shaped oil seal provided on an inner periphery of the housing and below the bearing; a shaft flange that is integrally provided on an outer periphery of the blade shaft below the oil seal and is connected to the blade disk; Further comprising: The shaft protection cover may be fixed to the base plate by clamping the periphery of the through hole of the base plate and the periphery of the through hole of the shaft protection cover between a nut from above and a lower end of the housing from below. In this embodiment, The main body may be an autonomously movable mobile device. In order to achieve the above object, one aspect of the present disclosure is to A grass cutting method for a grass cutter including a main body, a drive unit provided on the main body, a blade shaft penetrating a lower surface of the main body and extending downward from the lower surface and rotated by a drive force of the drive unit, and a blade disk connected to a lower end of the blade shaft, rotating about the blade shaft, and supporting a blade for cutting grass, comprising: This is a grass cutting method in which the outer periphery of the lower part of the blade shaft exposed from the underside of the main body is covered with a shaft protection cover, and the blade shaft and the blade disk are rotated to cut grass with the blade. Effect of the Invention

[0007] According to the present disclosure, it is possible to provide a grass cutter and a grass cutting method that can prevent grass cut by the cutting blade from becoming entangled in the cutting shaft. [Brief description of the drawings]

[0008] [Figure 1] 1 is a perspective view showing the appearance of a grass cutter according to an embodiment of the present invention; [Diagram 2] FIG. 2 is a perspective view showing the appearance of the lower side of the grass cutter according to the embodiment. [Diagram 3] FIG. 2 is a top view showing the appearance of the upper surface of the mower according to the present embodiment. [Figure 4] 1 is a block diagram showing a schematic system configuration of a grass cutter according to an embodiment of the present invention; [Diagram 5] FIG. 4 is a cross-sectional view of the grass mowing device taken along the line AA in FIG. 3 in the vertical direction, showing a schematic configuration of the grass mowing device. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0009] Hereinafter, the present embodiment will be described with reference to the drawings. Fig. 1 is a perspective view showing the appearance of the grass cutter according to the present embodiment. Fig. 2 is a perspective view showing the appearance of the lower side of the grass cutter according to the present embodiment. Fig. 3 is a top view showing the appearance of the upper surface of the grass cutter according to the present embodiment. Fig. 4 is a block diagram showing a schematic system configuration of the grass cutter according to the present embodiment.

[0010] The grass cutter 1 according to this embodiment travels within a predetermined area, such as a garden, and cuts grass growing within that area. The grass cutter 1 according to this embodiment includes a movable moving device 2, a grass cutting device 3 that is provided on the moving device 2 and performs grass cutting work, and a control device 4 that controls the moving device 2 and the grass cutting device 3.

[0011] The mobile device 2 is a specific example of a main body. The mobile device 2 is configured to be capable of autonomously traveling based on, for example, GPS signals transmitted from GPS (Global Positioning System) satellites and sensor information from various sensors 5 such as a camera, an ultrasonic sensor, a radar sensor, and a rotation sensor provided in the mobile device 2.

[0012] The control device 4 controls the driving of the caterpillar (registered trademark) 7 based on the GPS signal and sensor information from the various sensors 5, thereby causing the moving device 2 to move forward and backward and turn left and right. Note that the moving device 2 may also move forward and backward and turn left and right by, for example, rotating and driving the wheels.

[0013] The drive unit 6 of the grass cutting device 3 drives and rotates the cutting blade shaft 31 in response to a control signal from the control device 4, as described below.

[0014] The control device 4 has a hardware configuration of a typical computer, including, for example, a processor such as a CPU (Central Processing Unit) and a GPU (Graphics Processing Unit), internal memory such as a RAM (Random Access Memory) and a ROM (Read Only Memory), storage devices such as an HDD (Hard Disk Drive) and an SDD (Solid State Drive), an input / output I / F for connecting peripheral devices such as a display, and a communication I / F for communicating with devices outside the device.

[0015] Fig. 5 is a cross-sectional view showing a schematic configuration of the grass cutting device, taken along the line AA in Fig. 3. As shown in Fig. 5, the grass cutting device 3 includes a blade shaft 31, a blade disk 32 connected to the blade shaft 31, and a shaft protection cover 33 that covers the outer periphery of the blade shaft 31.

[0016] A plate-shaped base plate 22 is connected to the underside 21 of the moving device 2 by bolts 23 or the like. The lower end of the blade shaft 31 penetrates the underside 21 and the base plate 22 and extends downward outward from the underside 21 and the base plate 22. A shaft flange 34 is provided integrally with the blade shaft 31 on the outer periphery of the blade shaft 31. The blade shaft 31 and the shaft flange together form a rotating shaft.

[0017] An upwardly extending cylindrical housing 35 is provided upright on the base plate 22. A bearing 36 is provided on the lower and inner periphery of the housing 35. The bearing 36 supports the cutting blade shaft 31 rotatably within the housing 35.

[0018] In addition, a ring-shaped oil seal 37 is provided on the inner periphery of the housing 35 and below the bearing 36. The oil seal 37 prevents the oil in the bearing 36 from leaking to the outside and prevents foreign matter from adhering to the bearing 36 from the outside.

[0019] The blade shaft 31 is connected to a drive shaft of a drive unit 6 such as a motor via a reducer, etc. As a result, the blade shaft 31 and the shaft flange 34 are rotated by the driving force of the drive unit 6.

[0020] The cutting blade disc 32 is a disc-shaped member. The cutting blade disc 32 is disposed parallel to the base plate 22 at a position a predetermined distance from the base plate 22. The cutting blade disc 32 is connected to the lower end of the cutting blade shaft 31 and the shaft flange 34 via bolts 38, 39, etc. Therefore, when the cutting blade shaft 31 and the shaft flange 34 rotate, the cutting blade disc 32 also rotates around the cutting blade shaft 31.

[0021] A plurality of cutting blades 40 are rotatably supported on the cutting blade disk 32. For example, as shown in Fig. 2, three pairs of upper and lower cutting blades 40 for cutting grass are supported at equal intervals along the outer periphery of the cutting blade disk 32 on the outer periphery of the upper and lower surfaces, respectively.

[0022] 5, the blade support shaft 41 penetrates the blade disc 32 and the pair of upper and lower blades 40 from below, and a nut 42 is screwed onto the tip of the blade support shaft 41 from above. As a result, the pair of upper and lower blades 40 are rotatably supported by the blade support shaft 41 fixed to the blade disc 32. When the blade disc 32 rotates about the blade shaft 31, the centrifugal force causes the blade 40 to simultaneously rotate about the blade support shaft 41.

[0023] The number, position, supporting method and shape of the cutting blades 40 provided on the cutting blade disk 32 may be changed as appropriate depending on the type, density and other factors of the grass to be cut.

[0024] When the blade shaft 31 rotates by the driving force of the drive unit 6 and the blade disk 32 rotates, the blade 40 of the blade disk 32 also rotates at the same time, and the blade 40 comes into contact with grass, thereby cutting the grass.

[0025] Conventionally, when the blade shaft rotates and high-density grass is cut by the blade, there is a risk that the cut grass may become entangled in the blade shaft. For example, grass that is longer than the circumference of the blade shaft may become entangled in the blade shaft, causing problems such as excessive load on the drive unit 6.

[0026] In contrast, in this embodiment, the shaft protection cover 33 covers the outer periphery of the blade shaft 31 and the shaft flange 34 that are exposed outside the base plate 22. This makes it possible to prevent grass cut by the blade 40 from becoming entangled with the blade shaft 31 and the shaft flange 34.

[0027] 5, the shaft protection cover 33 is, for example, a substantially cylindrical member having a through hole 331 formed in its upper end surface and an open lower end. Note that the shape of the shaft protection cover 33 shown in Fig. 5 is only an example, and any shape may be used as long as it can cover the outer periphery of the blade shaft 31 and the shaft flange 34 exposed from the lower surface 21 and the base plate 22.

[0028] A male screw is formed on the outer periphery of the lower side of the housing 35, and as described below, a nut 44 is screwed onto this male screw from above via a spacer 43, thereby fixing the shaft protection cover 33 to the base plate 22.

[0029] That is, the lower end 351 of the housing 35 passes through the through hole 221 of the base plate 22 and the through hole 331 of the shaft protection cover 33. The shaft protection cover 33 is fixed to the base plate 22 by sandwiching the periphery of the through hole 221 of the base plate 22 and the periphery of the through hole 331 of the shaft protection cover 33 between the nut 44 from above and the lower end 351 of the housing 35 from below.

[0030] As described above, according to the grass cutting method of the grass cutter of this embodiment, when the cutting blade shaft 31 rotates by the driving force of the drive unit 6 and the cutting blade disk 32 rotates, the cutting blade 40 of the cutting blade disk 32 also rotates at the same time. The rotating cutting blade 40 comes into contact with the grass, thereby cutting the grass.

[0031] At this time, the outer periphery of the blade shaft 31 and shaft flange 34 exposed from the housing 35 is covered by the shaft protection cover 33. As a result, even if grass cut by the blade 40 scatters toward the blade shaft 31 and shaft flange 34, the shaft protection cover 33 can reliably prevent the scattered grass from becoming entangled with the blade shaft 31 and shaft flange 34.

[0032] In addition, the labyrinth structure established among the shaft protection cover 33, the cutting blade shaft 31, the shaft flange 34, and the housing 35, on the one hand, and the oil seal 37, on the other hand, prevents foreign matter such as grass and soil scattered during the above-mentioned mowing from coming into contact with the oil seal 37. This also leads to an improvement in the replacement life and reliability of the oil seal 37.

[0033] Although some embodiments of the present disclosure have been described, these embodiments are presented as examples and are not intended to limit the scope of the invention. These novel embodiments can be implemented in various other forms, and various omissions, substitutions, and modifications can be made without departing from the spirit of the invention. These embodiments and their modifications are included in the scope and spirit of the invention, and are included in the scope of the invention and its equivalents described in the claims. [Explanation of symbols]

[0034] 1 grass cutter, 2 moving device, 3 grass cutter, 4 control device, 5 sensor, 6 drive unit, 7 caterpillar, 21 underside, 22 base plate, 23 bolt, 31 cutting blade shaft, 32 cutting blade disk, 33 shaft protective cover, 34 shaft flange, 35 housing, 36 bearing, 37 oil seal, 38 bolt, 40 cutting blade, 41 cutting blade support shaft, 42 nut, 43 spacer, 44 nut, 221 through hole, 331 through hole, 351 lower end

Claims

1. A main body portion, A drive unit provided in the main body unit; a cutting blade shaft that penetrates a lower surface of the main body, extends downward from the lower surface, and is rotated by a driving force of the driving unit; a blade disk connected to a lower end of the blade shaft, rotating about the blade shaft, and supporting a blade for cutting grass; a shaft protection cover that covers an outer periphery of a lower portion of the blade shaft that is exposed from a lower surface of the main body; Equipped with Lawnmower.

2. The grass cutter according to claim 1, a cylindrical housing fixed to a base plate on a lower surface of the main body; a bearing provided on an inner periphery of the housing and supporting the cutting blade shaft; a ring-shaped oil seal provided on an inner periphery of the housing and below the bearing; a shaft flange that is integrally provided on an outer periphery of the blade shaft below the oil seal and is connected to the blade disk; Further comprising: The shaft protection cover is fixed to the base plate by clamping the periphery of the through hole of the base plate and the periphery of the through hole of the shaft protection cover with a nut from above and a lower end of the housing from below. Lawnmower.

3. The grass cutter according to claim 1, The main body is an autonomously movable mobile device. Lawnmower.

4. A grass cutting method for a grass cutter including a main body, a drive unit provided on the main body, a blade shaft penetrating a lower surface of the main body and extending downward from the lower surface and rotated by a drive force of the drive unit, and a blade disk connected to a lower end of the blade shaft, rotating about the blade shaft, and supporting a blade for cutting grass, comprising: A grass cutting method in which grass is cut with the blade by rotating the blade shaft and the blade disk while covering the outer periphery of the lower part of the blade shaft exposed from the underside of the main body with a shaft protective cover.

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