JP7470961B2 - Agricultural machinery - Google Patents

Description

The present invention relates to a self-propelled agricultural machine.

Currently, agricultural machinery is being automated to reduce the amount of time spent on farm work, and a variety of farm machinery has been developed. In particular, farm machinery (rotary tillers and plows) that is attached to the rear of a running body such as a tractor and can be changed depending on the type of farm work can be used for a variety of farm work simply by attaching it to the running body like an attachment, making a significant contribution to reducing the cost of farm work.

In recent years, development has been progressing with the aim of automating agricultural work by further automating agricultural machinery. Up until now, the automation of agricultural work has been mainly focused on automating the running body. Therefore, when automating agricultural work such as plowing and harrowing, the mainstream method has been to have a self-propelled running body tow a conventional agricultural machine, as described in Patent Document 1, for example.

JP 2018-201444 A

When trying to realize an unmanned agricultural machine, i.e., a self-propelled agricultural machine, rather than a traveling body, it is necessary to arrange a traveling means such as wheels, an engine, etc. in addition to the parts that perform agricultural work (e.g., a work rotor, etc.). In this case, if the work rotor, etc. is arranged behind the traveling means and engine, the overall length of the agricultural machine will increase, leading to an increase in size. However, if the work rotor, etc. is arranged in front of the traveling means, there is a problem in that the traveling marks (tracks) made by the traveling means cannot be erased.

The objective of one embodiment of the present invention is to improve the leveling performance of a self-propelled agricultural machine.

In one embodiment of the present invention, the agricultural work machine is equipped with a working section for cultivating a field that is provided between the front and rear wheels, and a ground leveling member that is provided behind the rear wheels, and in a plan view, the front end of the ground leveling member has a first inclination that is at least outward of the rear wheels and recedes toward the inside.

The first inclination may extend continuously from the outer side of the rear wheel to the inner side of the rear wheel.

The front end of the ground leveling member may have a second inclination that is more inward than the first inclination and recedes toward the outside.

The intersection of the second inclination and the first inclination may be located within a range through which the rear wheel passes in a plan view, or may be located inside or outside the rear wheel.

The vehicle may further have a flat portion between the first inclination and the second inclination that is approximately perpendicular to the traveling direction. In this case, the width of the flat portion may be approximately the same as the width of the rear wheel. Also, the vehicle may further have a curved portion between the first inclination and the second inclination.

The ground leveling member may be configured so that the portion having the first incline is foldable relative to the portion having the second incline.

According to one embodiment of the present invention, it is possible to improve the leveling performance of a self-propelled agricultural machine.

1 is a plan view showing a configuration of an agricultural machine according to a first embodiment of the present invention. FIG. FIG. 1 is a left side view showing a configuration of an agricultural machine according to a first embodiment of the present invention. FIG. 4 is a plan view showing a schematic positional relationship between rear wheels and a third ground leveling member in the agricultural machine according to the first embodiment of the present invention. FIG. 2 is a side view showing the configuration of a ground leveling member in the agricultural machine according to the first embodiment of the present invention. FIG. 11 is a plan view showing a schematic positional relationship between the rear wheels and a third ground leveling member in an agricultural work machine according to a second embodiment of the present invention. FIG. 11 is a plan view showing the configuration of an agricultural work machine according to a third embodiment of the present invention.

The agricultural working machine of the present invention will be described below with reference to the drawings. However, the agricultural working machine of the present invention can be implemented in many different forms, and should not be interpreted as being limited to the description of the examples shown below. In the drawings referred to in this embodiment, identical parts or parts having similar functions are designated with the same reference numerals or the same reference numerals followed by an alphabet, and repeated explanations will be omitted.

In the specification and claims of this application, "up" refers to a direction moving vertically away from the field, and "down" refers to a direction moving vertically toward the field. Additionally, "front" refers to the direction in which the agricultural machine advances while working on the field, and "rear" refers to a direction 180 degrees opposite to front. Additionally, "left" and "right" refer to the left and right directions when the agricultural machine is facing forward. The left and right length of each component part of the agricultural machine is referred to as "width." Furthermore, when the center line of the agricultural machine in a plan view (a line parallel to the direction of travel) is used as the base, the side closer to the center line is referred to as the "inner side," and the side farther from the center is referred to as the "outer side."

In the specification and claims of this application, the term "cultivate" includes at least the actions of "puddling," "cultivation," and "soil crushing." In the following embodiment, a puddler is used as a representative example of an agricultural work machine, but this is not limited to this example, and the present invention can be applied to agricultural work machines that cultivate fields, such as cultivators and soil crushers, in addition to puddlers.

First Embodiment
[Configuration of agricultural machine]
The agricultural work machine 100 of this embodiment is a self-propelled agricultural work machine that performs work unmanned while moving forward. Fig. 1 is a plan view showing the configuration of the agricultural work machine of the first embodiment of the present invention. Fig. 2 is a left side view showing the configuration of the agricultural work machine of the first embodiment of the present invention. As shown in Figs. 1 and 2, the agricultural work machine 100 of this embodiment has a frame 200, a pair of front wheels 300, a pair of rear wheels 400, a working unit 500, and an auxiliary ground leveling unit 600. In Fig. 2, the dashed dotted line represents the surface of a farm field 101 that is assumed to be used during work.

The frame 200 includes a main frame 210, a front wheel frame 220, and a rear wheel frame 230. The main frame 210 is a member that constitutes the skeleton of the agricultural work machine 100. Although not shown, the main frame 210 is provided with various functional members for operating the agricultural work machine 100. Examples of the various functional members include an engine, a transmission, a turning mechanism, a drive control mechanism, a communication mechanism, and a fuel tank. In this embodiment, a control signal is received from a server or a remote control by wireless communication via the communication mechanism, and the drive control mechanism drives the engine, the transmission, or the turning mechanism based on the received control signal. These operations cause the agricultural work machine 100 to automatically travel. Note that the turning mechanism may turn only the front wheels 300 left and right, may turn only the rear wheels 400 left and right, or may turn both wheels.

The front wheel frame 220 is connected to the front side of the main frame 210 and extends downward from the main frame 210. A front wheel 300 is attached near the lower end of the front wheel frame 220. The rear wheel frame 230 is connected to the rear side of the main frame 210 and extends downward from the main frame 210. A rear wheel 400 is attached near the lower end of each rear wheel frame 230.

The front wheel frame 220 extends almost vertically from the main frame 210 toward the field and is fixed to the main frame 210. In other words, the positional relationship between the front wheel frame 220 and the main frame 210 does not change. On the other hand, the rear wheel frame 230 extends diagonally downward from the main frame 210 and is connected to the main frame 210 so as to be rotatable. In other words, the rear end of the main frame 210 can be moved up and down by the rear wheel frame 230 rotating. However, this is not limited to this example, and the rear wheel frame 230 may also be fixed to the main frame 210 like the front wheel frame 220. Conversely, the front wheel frame 220 may be connected to the main frame 210 so as to be rotatable like the rear wheel frame 230.

The front wheels 300 and rear wheels 400 are provided in pairs on the front and rear sides of the main frame 210, respectively. In this embodiment, the front wheels 300 and rear wheels 400 are exemplified as tires, but are not limited to this example. For example, the front wheels 300 and rear wheels 400 may each have a structure similar to an endless track (crawler).

The working unit 500 includes a side frame 510, a working rotor 520, a shield cover 530, a first soil leveling member 540, and a second soil leveling member 550. The working unit 500 is a part that performs agricultural work such as plowing, cultivating, and soil breaking. As shown in FIG. 1, in the agricultural work machine 100 of this embodiment, the working unit 500 is provided between a pair of front wheels 300 and a pair of rear wheels 400. In other words, the agricultural work machine 100 is a mid-mount type agricultural work machine.

In this embodiment, the working unit 500 is configured to be able to move up and down. In FIG. 2, the working unit 500 and auxiliary leveling unit 600 are shown in solid lines when the agricultural work machine 100 is in a working state, and the working unit 500 and auxiliary leveling unit 600 are shown in dotted lines when the agricultural work machine 100 is in a non-working state. The lifting and lowering operation of the working unit 500 can be achieved, for example, by providing an expandable member such as a cylinder on the top of the working unit 500, or by providing a link mechanism for lifting and lowering the working unit on the front or rear upper part of the working unit 500.

In addition, in this embodiment, the auxiliary ground leveling unit 600 is configured to perform a lifting and lowering operation in conjunction with the lifting and lowering operation of the working unit 500. The lifting and lowering operation of the auxiliary ground leveling unit 600 can be performed, for example, by providing a wire or the like (not shown) that is pulled forward in conjunction with the lifting and lowering operation of the working unit 500, and using the tensile force of the wire or the like to rotate the support arm 620 (see FIG. 2) upward around the support shaft 610.

The side frame 510 is a frame that rotatably supports the work rotor 520. The work rotor 520 has a structure in which multiple work tines (cultivation tines) are provided on a claw shaft (not shown) that is rotatably supported on the side frame 510. In this embodiment, the work rotor 520 provided between the front wheels 300 and the rear wheels 400 rotates, and the multiple work tines act on the field, thereby cultivating the field.

The shield cover 530 is fixed to the side frame 510 so as to cover the upper part of the work rotor 520. The shield cover 530 is a cover member that prevents soil that is kicked up by the work rotor 520 from scattering upward. The shield cover 530 is provided across the entire width of the work rotor 520.

The first leveling member 540 is rotatably connected to the rear end of the shield cover 530 so as to cover the rear of the work rotor 520. The first leveling member 540 functions as a leveling member that levels out the undulations of the field cultivated by the work rotor 520, and also functions as a cover member that prevents soil splashed up by the work rotor 520 from scattering rearward. In this embodiment, in a plan view, the width of the first leveling member 540 is narrower on the rear end side (the side closer to the second leveling member 550) than on the front end side (the side closer to the shield cover 530).

The second ground leveling member 550 is rotatably connected to the rear end of the first ground leveling member 540. The second ground leveling member 550 functions as a ground leveling member that levels out the undulations of the field cultivated by the work rotor 520. However, the second ground leveling member 550 can be omitted if necessary.

The auxiliary ground leveling unit 600 includes a support shaft 610, a support arm 620, and a third ground leveling member 630. The support shaft 610 is spanned between a pair of rear wheel frames 230 and is rotatably supported relative to the rear wheel frames 230. The support arm 620 has one end fixed to the support shaft 610 and the other end fixed to the third ground leveling member 630, thereby supporting the third ground leveling member 630.

The third leveling member 630, like the second leveling member 550, functions as a leveling member that levels out the undulations of the field cultivated by the work rotor 520. In this embodiment, the third leveling member 630 includes a central leveling member 630C, a left leveling member 630L, and a right leveling member 630R. The left leveling member 630L and the right leveling member 630R are configured to be foldable relative to the central leveling member 630C. For example, the left leveling member 630L is connected to the central leveling member 630C via a pivot mechanism 635, and can be folded so as to overlap the central leveling member 630C. Although detailed explanation is omitted, the right leveling member 630R has a structure similar to that of the left leveling member 630L.

As shown in FIG. 1, in this embodiment, the width of the central leveling member 630C is approximately equal to the distance W1 between the center lines 402 of the pair of rear wheels 400. Therefore, when the left leveling member 630L and the right leveling member 630R are respectively deployed (spread outward) by rotating the rotating mechanism 635, the width (working width) of the third leveling member 630 is sufficiently wider than the distance W1 between the center lines 402 of the pair of rear wheels 400. Therefore, the third leveling member 630 can level the wheel marks (travel marks) formed in the field by the passage of the rear wheels 400. Furthermore, the third leveling member 630 of this embodiment has a front end portion with an approximately V-shape that expands toward the traveling direction in order to efficiently erase the wheel traces of the rear wheels 400. This point will be described later.

In this embodiment, the configuration in which the support shaft 610 rotates and the third leveling member 630 performs the raising and lowering operation is exemplified, but the present invention is not limited to this example. For example, instead of rotating the support shaft 610, the support arm 620 may be configured with two arm members to form a parallel link mechanism. In this case, the third leveling member 630 can be raised and lowered by operating the parallel link mechanism.

[Configuration of ground leveling members]
FIG. 3 is a plan view showing a schematic positional relationship between the rear wheel 400 and the third ground leveling member 630 in the agricultural work machine 100 according to the first embodiment of the present invention. Specifically, FIGS. 3(A) to 3(C) each show the positional relationship between the right rear wheel 400 and the right end of the third ground leveling member 630. Also, FIG. 4 is a side view showing the configuration of the third ground leveling member 630 in the agricultural work machine 100 according to the first embodiment of the present invention. Specifically, FIG. 4(A) is a side view of the central ground leveling member 630C in the agricultural work machine 100, and FIG. 4(B) is a modified example thereof. Note that the same parts as those in the agricultural work machine 100 shown in FIG. 1 are denoted by the same reference numerals and description thereof is omitted. Also, the description will be given here with a focus on the right end of the third ground leveling member 630, and description of the left end having the same structure and effect will be omitted.

3A shows the positional relationship between the right rear wheel 400 and the right end of the third ground leveling member 630 in the agricultural work machine 100 shown in FIG. 1. As shown in FIG. 3A, the front end of the third ground leveling member 630 has a first inclination 631 (the front end of the right ground leveling member 630R) that is recessed toward the inside (i.e., located further back toward the inside), and a second inclination 632 (the front end of the central ground leveling member 630C) that is recessed toward the outside (i.e., located further back toward the outside). In this embodiment, the first inclination 631 and the second inclination 632 are adjacent (continuous) to form an obtuse angle, forming a substantially V-shaped front end that widens toward the traveling direction. The angle between the first inclination 631 and the second inclination 632 is not limited to an obtuse angle, and can be set appropriately according to the working speed and soil quality.

As shown in FIG. 4A, the central leveling member 630C has a front surface 633b that is approximately perpendicular to the leveling surface 633a when viewed from the side. When the agricultural work machine 100 advances during the plowing operation, the mud in the field is retained on the leveling surface 633a and is embraced by the front surface 633b. That is, the front surface 633b acts as a surface that receives the mud in the field during the plowing operation. Then, when the third leveling member 630 moves forward with the plowing operation, the mud received in front of the front surface 633b is pushed along the first slope 631 and the second slope 632 formed at the front end of the third leveling member 630, efficiently filling in the unevenness of the field such as ruts. Note that the front surface 633b does not necessarily have to be perpendicular to the leveling surface 633a, and may have any angle, as long as the mud can be retained in front of the third leveling member 630. Furthermore, the shape is not limited to that shown in FIG. 4(A), and for example, as shown in FIG. 4(B), a generally L-shaped central leveling member 630Cf having a front surface 633bf that is generally perpendicular to the leveling surface 633af may be used.

As described above, the third leveling member 630 is configured to retain mud in the front, so that at the front end of the approximately V-shaped third leveling member 630, as the third leveling member 630 advances forward, the mud in the field flows along the first slope 631 and the second slope 632. That is, as the third leveling member 630 advances, the mud in the field gathers toward the intersection of the first slope 631 and the second slope 632 (hereinafter referred to as the "intersection point"). Therefore, if there is a trail of the rear wheel 400 near the intersection point of the first slope 631 and the second slope 632, the trail can be efficiently filled with mud. In addition, since the third leveling member 630 of the agricultural work machine 100 of this embodiment is foldable, the intersection point 634 is located at the boundary between the central leveling member 630C and the right leveling member 630R.

As shown in FIG. 3(A), in the agricultural work machine 100 of this embodiment, the intersection 634 between the first inclination 631 and the second inclination 632 is located almost on an extension of the center line 402 of the rear wheel 400. In other words, the intersection 634 is located directly behind the rear wheel 400. Therefore, since the center of the front end of the approximately V-shape is located within the range of the trail 404 formed by the rear wheel 400, the trail 404 of the rear wheel 400 can be efficiently filled and leveled.

In this embodiment, an example is shown in which the intersection 634 is located almost on an extension of the center line 402 of the rear wheel 400, but the intersection 634 does not have to be on an extension of the center line 402. In other words, as long as the intersection 634 is within the range of the trail 404 of the rear wheel 400 (i.e., within the range through which the rear wheel 400 passes in a plan view), the same effect as the configuration shown in FIG. 3(A) is achieved.

As described above, in a plan view, the agricultural work machine 100 of this embodiment has a front end of the third ground leveling member 630 with a first inclination 631 that recedes toward the inside and a second inclination 632 that recedes toward the outside. The center of the front end of the approximately V-shaped shape formed by the first inclination 631 and the second inclination 632 is located within the range of the running track 404 of the rear wheel 400. Therefore, as the third ground leveling member 630 advances, mud in the field gathers in the running track 404, and the running track 404 is efficiently erased, improving the leveling of the field. In this way, according to this embodiment, it is possible to provide an agricultural work machine 100 with improved field leveling performance.

(Variation 1)
Fig. 3(B) shows a modified example of the agricultural work machine 100 of the first embodiment. Specifically, in the third ground leveling member 630a shown in Fig. 3(B), an intersection 634 between the first inclination 631 and the second inclination 632 is located inside the rear wheels 400 in a plan view (i.e., inside the travel marks 404 of the rear wheels 400). Even in this case, the first inclination 631 of the right ground leveling member 630Ra and the second inclination 632 of the central ground leveling member 630Ca cause mud in the field to fill in the travel marks 404 and gather near the intersection 634, so that the travel marks 404 can be sufficiently leveled.

(Variation 2)
Fig. 3(C) shows a modified example of the agricultural work machine 100 of the first embodiment. Specifically, in the third ground leveling member 630b shown in Fig. 3(C), an intersection 634 between the first inclination 631 and the second inclination 632 is located outside the rear wheels 400 in a plan view (i.e., outside the tracks 404 of the rear wheels 400). Even in this case, the first inclination 631 of the right ground leveling member 630Rb and the second inclination 632 of the central ground leveling member 630Cb cause mud in the field to fill in the tracks 404 and gather near the intersection 634, so that the tracks 404 can be sufficiently leveled.

(Variation 3)
In the agricultural work machine 100 shown in Fig. 1, the third ground leveling member 630 is composed of three parts, a central ground leveling member 630C, a left ground leveling member 630L, and a right ground leveling member 630R, but is not limited to this example. For example, the third ground leveling member 630 may be an integrated member composed of a single member. In this case, the left and right ends of the third ground leveling member 630 may be processed to have a substantially V-shaped front end as described in this embodiment.

Second Embodiment
In the second embodiment, an example will be described in which the shape of a third ground leveling member is different from that in the first embodiment.

Figure 5 is a plan view showing a schematic positional relationship between the rear wheel 400 and the third ground leveling members 630c-630e in an agricultural work machine according to a second embodiment of the present invention. Specifically, Figures 5(A)-5(C) each show the positional relationship between the right rear wheel 400 and the right end of the third ground leveling members 630c-630e. Note that the same parts as those in the agricultural work machine 100 shown in Figure 1 are designated by the same reference numerals and will not be described. Also, the description here focuses on the right end of the third ground leveling members 630c-630e, and will not include a description of the left end, which has a similar structure and effect.

As shown in FIG. 5(A), the front end of the third leveling member 630c has a first slope 631 on the right leveling member 630Rc and a second slope 632 on the center leveling member 630Cc, as in the first embodiment. The difference from the third leveling member 630 of the first embodiment is that the third leveling member 630c has a flat portion 636 between the first slope 631 and the second slope 632 that is approximately perpendicular to the traveling direction. In FIG. 5(A), the width of the flat portion 636 is wider than the width of the rear wheel 400 (i.e., the width of the running track 404 of the rear wheel 400), but is not limited to this example. For example, the width of the flat portion 636 may be approximately the same as the width of the rear wheel 400, or may be narrower than the width of the rear wheel 400.

The front end of the third leveling member 630d shown in FIG. 5(B) has a curved portion 637 between the first slope 631 of the right leveling member 630Rd and the second slope 632 of the central leveling member 630Cd. The curvature of the curved portion 637 is arbitrary, but it is preferable to form it so as to smoothly connect between the first slope 631 and the second slope 632.

The front end of the third leveling member 630e shown in FIG. 5(C) has a third slope 638a, a fourth slope 638b, and a flat portion 638c between the first slope 631 of the right leveling member 630Re and the second slope 632 of the central leveling member 630Ce. The third slope 638a is a slope that has a steeper angle with respect to the flat portion 638c than the first slope 631. Similarly, the fourth slope 638b is a slope that has a steeper angle with respect to the flat portion 638c than the second slope 632. In the example shown in FIG. 5(C), the flat portion 638c has a width slightly narrower than the width of the rear wheel 400, but this is not limited to this example.

As described above, in this embodiment, the front ends of the third ground leveling members 630c-630e have a first inclination 631 that slopes back inward in a plan view, and a second inclination 632 that slopes back outward. Therefore, as the third ground leveling members 630c-630e advance, mud from the field collects in the tracks 404, which efficiently removes the tracks 404 and improves the leveling of the field. In this way, this embodiment can provide an agricultural machine with improved field leveling performance.

Note that in Figures 5(A) to 5(C) an example is shown in which the third leveling member is made up of three parts, a central leveling member, a left leveling member, and a right leveling member, but this is not limiting, and the third leveling member may be an integrated part made up of a single member.

Third Embodiment
In the third embodiment, an example will be described in which the shape of a third ground leveling member is different from that in the first embodiment.

Figure 6 is a plan view showing the configuration of an agricultural work machine 100a according to a third embodiment of the present invention. Specifically, the agricultural work machine 100a shown in Figure 6 has a third ground leveling member 630f as a component of the auxiliary ground leveling section 600f. Note that the same reference numerals are used to designate the same parts as those of the agricultural work machine 100 shown in Figure 1, and descriptions thereof will be omitted.

The third leveling member 630f has a center leveling member 630Cf, a left leveling member 630Lf, and a right leveling member 630Rf. In this case, this embodiment differs from the first embodiment in that the front end of the third leveling member 630f has a first incline 631 that recedes toward the inside, and does not have a second incline 632. Specifically, the agricultural work machine 100a of this embodiment has a first incline 631 that extends continuously from the outside of the rear wheels 400 to the inside of the rear wheels 400 at both left and right ends of the third leveling member 630f.

According to this embodiment, the mud accumulated in front of the third ground leveling member 630f flows inward along the first slope 631, so the mud on the outside of the rear wheels moves inward from the rear wheels and crosses the tracks of the rear wheels 400. Therefore, even with the configuration of the agricultural work machine 100a of this embodiment, the tracks can be efficiently filled with mud. In this way, according to this embodiment, it is possible to provide an agricultural work machine 100a with improved field leveling performance.

In this embodiment, the third leveling member 630f is shown as being flat near the center line of the agricultural work machine 100a, but this is not limiting, and the first slope 631 on the left side and the first slope 631 on the right side may intersect on the center line of the agricultural work machine 100a.

In addition, in the agricultural work machine 100a of this embodiment, an example is shown in which the pivoting mechanism 635 for folding the left ground leveling member 630Lf and the right ground leveling member 630Rf is disposed behind (directly behind) the rear wheels 400, but this is not limiting, and the pivoting mechanism 635 may be disposed further inward.

As explained above, the common feature of each of the agricultural working machines shown in the first to third embodiments is that the mud outside the rear wheels is moved inward, and the tracks left by the passage of the rear wheels are filled with mud. In other words, in a plan view, the agricultural working machine of one embodiment of the present invention only needs to have a first inclination in which the front end of the third ground leveling member is at least outward of the rear wheels and recedes as it moves inward.

Although the present invention has been described above with reference to the drawings, the present invention is not limited to the above-mentioned embodiments, and can be modified as appropriate without departing from the spirit of the present invention. For example, an agricultural machine according to any of the embodiments to which a person skilled in the art has appropriately added or deleted components or modified the design is also included in the scope of the present invention as long as it satisfies the gist of the present invention. Furthermore, the above-mentioned embodiments and variations can be combined as appropriate as long as there are no mutual contradictions, and technical matters common to each embodiment and variation are included in each embodiment and variation even if not explicitly stated.

Even if there are other effects and advantages different from those brought about by the above-mentioned embodiments and modified examples, if they are clear from the description in this specification or can be easily predicted by a person skilled in the art, they are naturally understood to be brought about by the present invention.

100...Agricultural work machine, 101...Field, 200...Frame, 210...Main frame, 220...Front wheel frame, 230...Rear wheel frame, 300...Front wheel, 400...Rear wheel, 402...Center line, 404...Travel trace, 500...Working part, 510...Side frame, 520...Working rotor, 530...Shield cover, 540...First ground leveling member, 550...Second ground leveling member, 6 00...Auxiliary leveling section, 610...Support shaft, 620...Support arm, 630, 630a-630f...Third leveling member, 631...First incline, 632...Second incline, 633a, 633af...Leveling surface, 633b, 633bf...Front, 634...Intersection, 635...Pivoting mechanism, 636...Flat section, 637...Curved section, 638a...Third incline, 638b...Fourth incline, 638c...Flat section

Claims (8)

A working unit for cultivating a field is provided between the front wheels and the pair of rear wheels;
A ground leveling member provided behind the pair of rear wheels;
Equipped with
The width of the ground leveling member is wider than the distance between the center lines of the pair of rear wheels,
In a plan view, the front end of the ground leveling member has a first inclination that is recessed from the outside toward the inside of the rear wheel for each rear wheel, and a second inclination that is provided inside the first inclination and recessed toward the outside,
The agricultural machine, wherein the portion of the ground leveling member having the first slope is foldable relative to the portion having the second slope. The agricultural machine of claim 1, wherein the second slope is adjacent to the first slope. The agricultural machine according to claim 1 or 2, wherein the first inclination extends continuously from the outer side of the rear wheels to the inner side of the rear wheels. A working part for cultivating a field is provided between the front wheels and the rear wheels;
A ground leveling member provided behind the rear wheels;
Equipped with
In a plan view, the front end of the ground leveling member has a first inclination that recedes from the outside toward the inside of the rear wheel, and has a second inclination that recedes from the inside of the first inclination toward the outside,
The ground leveling member has a portion having the first inclination that is foldable relative to a portion having the second inclination,
an intersection of the first inclination and the second inclination is located within a range through which the rear wheels pass in a plan view. A working part for cultivating a field is provided between the front wheels and the rear wheels;
A ground leveling member provided behind the rear wheels;
Equipped with
In a plan view, the front end of the ground leveling member has a first inclination that recedes from the outside toward the inside of the rear wheel, and has a second inclination that recedes from the inside of the first inclination toward the outside,
The ground leveling member has a portion having the first inclination that is foldable relative to a portion having the second inclination,
An agricultural machine, wherein an intersection point between the first inclination and the second inclination is located inside or outside the rear wheels in a plan view. The agricultural machine according to claim 1, further comprising a flat portion between the first incline and the second incline that is approximately perpendicular to the direction of travel. A working unit for cultivating a field is provided between the front wheels and the pair of rear wheels;
A ground leveling member provided behind the pair of rear wheels;
Equipped with
The width of the ground leveling member is wider than the distance between the center lines of the pair of rear wheels,
In a plan view, the front end of the ground leveling member has a first inclination that is recessed from the outside toward the inside of the rear wheel for each rear wheel, and a second inclination that is provided inside the first inclination and recessed toward the outside,
A flat portion is provided between the first inclination and the second inclination, the flat portion being substantially perpendicular to the traveling direction.
The width of the flat portion is approximately the same as the width of the rear wheels. The agricultural machine according to claim 1 , further comprising a curved portion between the first incline and the second incline.

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