JP7338869B2 - agricultural machine - Google Patents

Description

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

At present, automation of agricultural machinery is being promoted in order to reduce working hours of agricultural work, and various agricultural machinery are being developed. In particular, agricultural work machines (rotary tillers and puddles) that are attached to the rear of a traveling machine such as a tractor and can be exchanged according to the type of agricultural work can be used for various agricultural work simply by attaching them to the traveling machine like an attachment. It is possible to respond to this, which greatly contributes to the cost reduction of agricultural work.

In recent years, further progress has been made in the development of automatic agricultural machinery, with the aim of unmanned agricultural work. Regarding the unmanned farming, so far, the main focus has been on the unmanned traveling machine. Therefore, when unmanned agricultural work such as tillage work and puddling work is performed, the mainstream method is to tow a conventional agricultural work machine described in, for example, Patent Document 1 by a self-propelled traveling machine body.

JP 2018-201444 A

When trying to realize unmanned agricultural machinery instead of traveling machines, that is, self-propelled agricultural machinery, in addition to the parts that perform agricultural work (for example, work rotors, etc.), traveling means such as wheels, engines, etc. are arranged. There is a need to. However, simply arranging the traveling means so as to avoid areas where agricultural work is performed poses a problem of increasing the size of the agricultural work machine as a whole. In addition, increasing the size of the agricultural machinery poses a problem of restricting means of transportation, such as the need to load the agricultural machinery on a large truck when moving the agricultural machinery on public roads.

An object of one embodiment of the present invention is to downsize a self-propelled agricultural implement.

An agricultural work machine according to an embodiment of the present invention is provided with a working part for plowing a field between a front wheel and a pair of rear wheels, the working part comprising a working rotor having a plurality of working claws, and a and a first ground leveling member rotatably connected to the shield cover and located behind the work rotor. The rear end has a first portion narrower than the inner ring width.

An agricultural work machine according to an embodiment of the present invention is provided with a working part for plowing a field between a front wheel and a pair of rear wheels, the working part comprising a working rotor having a plurality of working claws, and a a shield cover located thereon, and a first leveling member pivotally connected to the shielding cover and located rearward of the work rotor, the first leveling member having a first portion at a rear end; In plan view, the difference between the width of the working rotor and the width of the first portion is larger than the width of the rear wheel.

The first grading member may further include a second portion having a width substantially the same as the width of the work rotor.

The width of the first leveling member may vary with a step between the first portion and the second portion, or may vary with an inclination.

The agricultural implement may further include a second ground leveling member rotatably connected to the first ground leveling member. In this case, the width of the second leveling member may be substantially the same as the width of the first portion of the first leveling member or less than or equal to the width of the first portion.

An agricultural work machine according to an embodiment of the present invention is provided with a working part for plowing a field between a front wheel and a pair of rear wheels, the working part comprising a working rotor having a plurality of working claws, and a a first leveling member rotatably connected to the shield cover and positioned rearward of the work rotor; and a second leveling member rotatably connected to the first leveling member. , the width of the second leveling member is narrower than the inner ring width of the pair of rear wheels;

During operation, the second ground leveling member may be positioned between the pair of rear wheels.

The outer ring width of the pair of rear wheels may be narrower than the width of the working rotor.

ADVANTAGE OF THE INVENTION According to one Embodiment of this invention, a self-propelled agricultural implement can be reduced in size.

BRIEF DESCRIPTION OF THE DRAWINGS It is a top view which shows the structure of the agricultural implement of 1st Embodiment of this invention. 1 is a left side view showing the configuration of an agricultural work machine according to a first embodiment of the present invention; FIG. 1 is a perspective view showing the configuration of a tilling work part in an agricultural work machine according to a first embodiment of the present invention; FIG. FIG. 2 is a plan view schematically showing the width relationship of each ground leveling member in the agricultural implement of the first embodiment of the present invention; FIG. 7 is a plan view schematically showing the width relationship of each ground leveling member in the agricultural implement of the second embodiment of the present invention; FIG. 11 is a plan view schematically showing the relationship of the widths of the ground leveling members in the agricultural implement of the third embodiment of the present invention;

Hereinafter, an agricultural work machine of the present invention will be described with reference to the drawings. However, the agricultural implement of the present invention can be implemented in many different forms and should not be construed as limited to the description of the examples given below. In the drawings referred to in this embodiment, the same parts or parts having similar functions are denoted by the same reference numerals or letters after the same reference numerals, and repeated description thereof will be omitted.

In the specification and claims of the present application, "up" indicates the direction away from the field vertically, and "down" indicates the direction vertically toward the field. Also, "front" indicates the direction in which the agricultural implement advances while working on the field, and "rear" indicates the direction 180 degrees opposite to the front. "Left" or "right" indicates the left-right direction when the agricultural implement faces forward. In addition, the length in the left-right direction of each component of the agricultural implement is called "width". Furthermore, when the center line (a line parallel to the traveling direction) of the agricultural implement in plan view is used as a reference, the side closer to the center line is called the "inner side", and the side farther from the center is called the "outer side".

In the specification and claims of this application, the term "cultivating" includes at least "puddling," "tilling," and "crushing." In the following embodiments, a puddling machine is representatively illustrated as an agricultural working machine, but the present invention is not limited to this example, and can be applied to agricultural working machines that plow a field, such as a cultivator and a soil crusher, in addition to the puddling machine. be able to.

<First embodiment>
[Composition of the agricultural machine]
The agricultural working machine 100 of this embodiment is a self-propelled agricultural working machine that performs unmanned work while moving forward. FIG. 1 is a plan view showing the construction of an agricultural implement according to the first embodiment of the present invention. FIG. 2 is a left side view showing the configuration of the agricultural implement according to 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 section 500 and an auxiliary leveling section 600. As shown in FIG. In addition, in FIG. 2, the dashed-dotted line represents the surface of the agricultural field 101 assumed at the time of work.

Frame 200 includes main frame 210 , front wheel frame 220 and rear wheel frame 230 . The main frame 210 is a member forming the framework of the agricultural work machine 100 . Although not shown, the main frame 210 is provided with various functional members for operating the agricultural implement 100 . Examples of various functional members include members such as 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 controller by wireless communication via a communication mechanism, and the drive control mechanism drives the engine, transmission, or turning mechanism based on the received control signal. Through these operations, the agricultural work machine 100 automatically travels. The turning mechanism may turn only the front wheels 300 left and right, turn only the rear wheels 400 left and right, or turn both wheels.

Front wheel frame 220 is connected to the front side of main frame 210 and extends downward from main frame 210 . A front wheel 300 is attached near the lower end of the front wheel frame 220 . Rear wheel frame 230 is connected to the rear side of main frame 210 and extends downward from 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 substantially vertically from the main frame 210 toward the field and is fixed to the main frame 210 . That is, the positional relationship between front wheel frame 220 and main frame 210 does not change. On the other hand, the rear wheel frame 230 extends obliquely downward and rearward from the main frame 210 and is rotatably connected to the main frame 210 . That is, by rotating the rear wheel frame 230, the rear end of the main frame 210 can be moved in the vertical direction. However, without being limited to this example, the rear wheel frame 230 may also be fixed to the main frame 210 in the same manner as the front wheel frame 220 . Also, conversely, the front wheel frame 220 may be rotatably connected to the main frame 210 in the same manner as the rear wheel frame 230 .

The front wheel 300 and the rear wheel 400 are provided in pairs on the front side and rear side of the main frame 210, respectively. In this embodiment, the front wheels 300 and the rear wheels 400 are exemplified by tires, but are not limited to this example. For example, the front wheels 300 and the rear wheels 400 may each have a track-like structure.

The working part 500 includes a side frame 510 , a working rotor 520 , a shield cover 530 , a first leveling member 540 and a second leveling member 550 . The working part 500 is a part for performing farm work such as puddling, plowing, soil crushing, and the like. As shown in FIG. 1 , the agricultural implement 100 of this embodiment has a working portion 500 provided between a pair of front wheels 300 and a pair of rear wheels 400 . In other words, the agricultural working machine 100 is a mid-mounted agricultural working machine.

In addition, in this embodiment, the working unit 500 is configured to be vertically movable. In FIG. 2 , the working part 500 and the auxiliary leveling part 600 when the agricultural work machine 100 is in the working state are indicated by solid lines, and the working part 500 and the auxiliary leveling part 600 when the agricultural machine 100 is in the non-working state are indicated by dotted lines. For the lifting operation of the working part 500, for example, a telescopic member such as a cylinder is provided in the upper part of the working part 500, or a link mechanism is provided in the upper part of the front side or the upper part of the rear side of the working part 500 for raising and lowering the working part. It is possible to realize

Further, in this embodiment, the auxiliary leveling unit 600 is also configured to move up and down in conjunction with the up and down operation of the working unit 500 . The lifting operation of the auxiliary leveling unit 600 is performed, for example, by providing a wire or the like (not shown) that is pulled forward in conjunction with the lifting operation of the working unit 500, and using the tensile force of the wire or the like, the support arm 620 ( 2) is rotated upward about the support shaft 610. As shown in FIG.

The side frame 510 is a frame that rotatably supports the work rotor 520 . The working rotor 520 has a structure in which a claw shaft (not shown) rotatably supported on the side frame 510 is provided with a plurality of working claws (cultivation claws). In this embodiment, the work rotor 520 provided between the front wheel 300 and the rear wheel 400 rotates, and a plurality of work claws act on the field, thereby performing the tilling work of the field. Note that, in this embodiment, a chain case 515 that transmits power to the working rotor 520 is provided to the left side plate 510 .

Shield cover 530 is fixed to side frame 510 so as to cover work rotor 520 from above. The shield cover 530 is a cover member that prevents the soil thrown up by the work rotor 520 from scattering upward. Shield cover 530 is provided over the entire width of working 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 working rotor 520 . The first ground leveling member 540 functions as a ground leveling member for leveling the undulations of the field plowed by the work rotor 520 and also functions as a cover member for preventing the soil thrown up by the work rotor 520 from scattering backward. 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). there is This point will be described later.

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

The auxiliary leveling part 600 includes a support shaft 610 , a support arm 620 and a third leveling member 630 . The support shaft 610 spans between the pair of rear wheel frames 230 and is rotatably supported on 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 leveling member 630 to support the third leveling member 630 . The third leveling member 630 , like the second leveling member 550 , functions as a leveling member for leveling the undulations of the field plowed by the working rotor 520 . In particular, since the width (working width) of the third ground leveling member 630 of the present embodiment is wider than the outer wheel width W3 (see FIG. 3) of the pair of rear wheels 400, the wheels formed in the field by the passage of the rear wheels 400 It also has the role of erasing the traces (ruts).

In this embodiment, the configuration in which the support shaft 610 rotates and the third ground leveling member 630 moves up and down is illustrated, 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 vertical movement of the third leveling member 630 can be realized by operating the parallel link mechanism.

[Specific Configuration of Tillage Unit]
FIG. 3 is a perspective view showing the configuration of the tillage work section 500 in the agricultural work machine 100 according to the first embodiment of the present invention. In FIG. 3 , the working rotor 520 (not shown) is surrounded by the side frame 510 , the shield cover 530 and the first leveling member 540 . Chain case 515 transmits power transmitted from the traveling machine body to work rotor 520 via a PTO shaft (not shown). The first leveling member 540 is rotatably supported at the rear end of the shield cover 530 . Also, the second leveling member 550 is rotatably supported at the rear end of the first leveling member 540 .

In this embodiment, the shape of the shield cover 530 is different from that of the conventional shield cover. Specifically, as shown in FIG. 3, the width of the first leveling member 540 is greater at the rear end (the side closer to the second leveling member 550) than at the front end (the side closer to the shield cover 530). It has a narrow structure. However, in order to shield the soil scattered backward by the working rotor 520, the first portion 540a of the first leveling member 540 is provided with side plates 540c having surfaces directed outward on the left and right sides. Below the second portion 540b of the leveling member 540, a back plate 540d having a surface facing the rear wheel 400 (not shown) is provided. As shown in FIG. 3, the side plate 540c and the rear plate 540d are connected substantially perpendicularly to each other and are configured to cover the rear of the working rotor 520. As shown in FIG. The first portion 540a and the second portion 540b will be described in detail with reference to FIG.

[Structure of leveling member]
FIG. 4 is a plan view schematically showing the width relationship of each ground leveling member in the agricultural work machine 100 of the first embodiment of the present invention. Specifically, FIG. 4 is a schematic diagram showing parts necessary for explanation extracted from the plan view of the agricultural work machine 100 shown in FIG. Note that the same parts as those of the agricultural work machine 100 shown in FIG. 1 are denoted by the same reference numerals, and description thereof may be omitted.

In FIG. 4, the width (working width) of the working rotor 520 is W1. In this embodiment, the width W1 of the working rotor 520 and the width of the shield cover 530 are substantially the same. Also, the width between the right end of the left wheel and the left end of the right wheel in the pair of rear wheels 400 is defined as "inner wheel width W2", and the left end of the left wheel and the right end of the right wheel in the pair of rear wheels 400 The width between is defined as "outer ring width W3". At this time, in the agricultural work machine 100 of the present embodiment, the width W1 of the work rotor 520 is wider than the outer ring width W3 of the pair of rear wheels 400 . Therefore, if the width of the first leveling member 540 and the second leveling member 550 were the same as the width W1 of the work rotor 520, the first leveling member 540 and the second leveling member 550 would interfere with the rear wheel 400. Therefore, the rear wheels 400 must be arranged behind the first leveling member 540 and the second leveling member 550, which may cause a problem of increasing the size of the aircraft.

Therefore, in this embodiment, the width of the portion including the rear end of the first ground leveling member 540 is made narrower than the inner wheel width W2 of the pair of rear wheels 400 so that the first ground leveling member 540 and the second ground leveling member 550 are separated from each other by the pair of rear wheels. It is configured so that it can be arranged between the wheels 400 and the body can be miniaturized. Specifically, the first leveling member 540 of the present embodiment includes a first portion 540a having a width W4 narrower than the inner ring width W2 of the pair of rear wheels 400 and a width W5 substantially the same as the width W1 of the working rotor 520. and a second portion 540b having a That is, in the first leveling member 540 of the present embodiment, the width W5 of the second portion 540b connected to the rear end of the shield cover 530 is substantially the same as the width W1 of the shield cover 530. As shown in FIG. The first leveling member 540 is bilaterally symmetrical, and the first portion 540a protrudes rearward from the rear end of the second portion 540b.

In addition, as shown in FIG. 4, in the agricultural work machine 100 of the present embodiment, the difference (W1-W4) between the width W1 of the work rotor 520 and the width W4 of the first portion 540a in a plan view corresponds to the width of the pair of rear wheels. It is wider than the total width of 400 (tire width in the case of this embodiment). Each of the pair of rear wheels 400 is arranged in the space created by the above difference, and the outer ring width W3 of the pair of rear wheels 400 can be accommodated within the width W1 of the working rotor 520. . In addition, since the rear wheel 400 can be arranged to overlap the first leveling member 540 and the second leveling member 550 in the front-rear direction, the agricultural work machine 100 according to the present embodiment includes the working rotor 520 and the rear wheel 400. It is possible to shorten the distance between

Furthermore, in this embodiment, the width W6 of the second leveling member 550 is substantially the same as the width W4 of the first portion 540a of the first leveling member 540 or less than or equal to the width W4 of the first portion 540a. That is, the width W6 of the second leveling member 550 is also narrower than the inner ring width W2 of the pair of rear wheels 400 . Therefore, in this embodiment, the second leveling member 550 can also be positioned between the pair of rear wheels 400 in plan view. However, within a range narrower than the inner ring width W2 of the pair of rear wheels 400 (within a range that does not interfere with the rear wheels 400), the width W6 of the second leveling member 550 is equal to the first portion 540a of the first leveling member 540. may be wider than the width of

As described above, in the agricultural work machine 100 of the present embodiment, both the width W4 of the first portion 540a of the first ground leveling member 540 and the width W6 of the second ground leveling member 550 are larger than the inner ring width W2 of the pair of rear wheels 400. narrow. As a result, even if the first leveling member 540 and the second leveling member 550 rotate upward due to a deep plowing depth, they do not interfere with the rear wheel 400 . Therefore, the working unit 500 can be arranged compactly between the front wheel 300 and the rear wheel 400, and the size of the agricultural work machine 100 can be reduced.

In the farm work machine 100 of the present embodiment, the width W1 of the work rotor 520 is the width of the pair of front wheels 300 when the distance between the left end of the left wheel and the right end of the right wheel of the pair of front wheels 300 is defined as an outer wheel width W7. It is wider than the outer ring width W7. Therefore, the wheel marks formed on the field by the passing of the front wheels 300 can be erased by the working rotor 520 . However, the width W1 of the working rotor 520 is not limited to this example, and may be a width equal to or less than the outer ring width W7 of the pair of front wheels 300 . Also, the width W8 of the third leveling member 630 is wider than the outer ring width W3 of the pair of rear wheels 400 . Therefore, the third ground leveling member 630 can also erase wheel marks formed on the field by the passage of the rear wheel 400 .

Further, as shown in FIG. 4, in the present embodiment, the width of the first ground leveling member 540 changes with one step between the first portion 540a and the second portion 540b. , but not limited to this example. For example, the width of the first leveling member 540 may change stepwise from the second portion 540b to the first portion 540a, and may have a plurality of steps between the first portion 540a and the second portion 540b. .

(Modification 1)
In the above-described embodiment, as shown in FIG. 4, the first leveling member 540 has a second portion 540b having a width substantially equal to that of the work rotor 520 and a first portion 540a having a narrower width than the second portion 540b. An example including is described. However, without being limited to this example, the first leveling member 540 may not have the second portion 540b. For example, in the agricultural implement 100 shown in FIG. 4, the first leveling member 540 may be connected to the shield cover 530 with the same width as the first portion 540a shown in FIG. At this time, the side plate 540c and the rear plate 540d shown in FIG. 3 may be arranged in the rear portion of the work rotor 520 where the first leveling member 540 is not present to prevent the scattering of soil.

(Modification 2)
In this embodiment, an example in which a pair of front wheels 300 are arranged in front of the working unit 500 is shown, but the present invention is not limited to this example, and the number of front wheels 300 may be one. That is, a three-wheeled agricultural machine may be configured in which the front wheel frame 220 is arranged near the center line of the agricultural machine 100 to support one front wheel 300 and the pair of rear wheel frames 230 each support the rear wheel 400 .

1 to 4 illustrate wheels (tires) as front wheels 300 and rear wheels 400, but the present invention is not limited to this example. For example, at least one of the front wheels 300 and the rear wheels 400 may use a crawler track. In this case, the crawler track (shoe) of the endless track may be regarded as the front wheel 300 or the rear wheel 400 .

(Modification 3)
In this embodiment, an example is shown in which the third leveling member 630 is a member wider than the outer ring width W3 of the pair of rear wheels 400, but the present invention is not limited to this example. For example, the third ground leveling member 630 may be provided independently for each of the left and right rear wheels 400 . In other words, in light of the purpose of erasing the left and right rear wheels 400, the third leveling members 630 are separately provided behind the right rear wheel 400 and behind the left rear wheel 400, respectively. good too.
(Modification 4)
Although the third leveling member 630 is a plate-like member in this embodiment, it is not limited to this example. For example, the third leveling member 630 may be another member capable of leveling ruts. For example, as the third leveling member 630, a rotating body for crushing (roller, basket roller, Cambridge roller, etc.) may be used.

<Second embodiment>
In this embodiment, a farm working machine 100a having a first leveling member 542 having a shape different from that of the first embodiment will be described with reference to FIG. The same parts as those of the agricultural work machine 100 shown in FIGS. 1 to 4 are denoted by the same reference numerals, and description thereof is omitted.

FIG. 5 is a plan view schematically showing the width relationship of each ground leveling member in the agricultural implement 100a of the second embodiment of the present invention. In the agricultural work machine 100a of the present embodiment, the first ground leveling member 542 is formed in a widening shape from the second portion 542b to the first portion 542a in plan view, and the width of the first portion 542a and the width of the second portion 542a are the same as those of the first portion 542a. It changes with an inclination between the portion 542b. That is, in this embodiment, the width of the first leveling member 542 changes continuously from the second portion 542b to the first portion 542a.

In the agricultural work machine 100a of the present embodiment, both the width W4 of the first portion 542a of the first ground leveling member 542 and the width W6 of the second ground leveling member 550 are narrower than the inner ring width W2 of the pair of rear wheels 400. Even if the member 542 and the second leveling member 550 rotate upward, they do not interfere with the rear wheel 400 . Therefore, the working part 500a can be arranged compactly between the front wheel 300 and the rear wheel 400, and the size of the agricultural working machine 100a can be reduced.

<Third Embodiment>
In the present embodiment, agricultural implements 100b and 100c having second leveling members 550b and 550c having shapes different from those of the first embodiment will be described with reference to FIGS. 6A and 6B, respectively. It should be noted that the same reference numerals are used for the same parts as those of the agricultural work machine 100 shown in FIGS.

FIGS. 6(A) and 6(B) are plan views schematically showing the relationship of the widths of the ground leveling members in agricultural implements 100a and 100b, respectively, according to the third embodiment of the present invention. In FIG. 6A, in the agricultural implement 100b of the present embodiment, the width W5 of the first leveling member 544 is substantially the same as the width W1 of the shield cover 530, and does not change from the front end to the rear end. On the other hand, the width W6 of the second leveling member 550b is narrower than the width W5 of the first leveling member 544 and narrower than the inner ring width W2 of the pair of rear wheels 400 . Therefore, behind the first leveling member 544, a space corresponding to the difference (W5-W6) between the width W5 of the first leveling member 544 and the width W6 of the second leveling member 550b is created. Therefore, it is possible to shorten the distance between the working rotor (not shown) and the rear wheels 400 by arranging the pair of rear wheels 400 in accordance with the space created by the difference described above.

In this way, in the agricultural work machine 100b shown in FIG. 6A, the width W6 of the second leveling member 550b is narrower than the inner ring width W2 of the pair of rear wheels 400, and the first leveling member 544 and the second leveling member 550b are Even if it rotates upward, it does not interfere with the rear wheel 400. - 特許庁Therefore, the working part 500b can be arranged compactly between the front wheel 300 and the rear wheel 400, and the size of the agricultural working machine 100b can be reduced.

Also, in FIG. 6B, in the agricultural implement 100c of the present embodiment, the width W5 of the first leveling member 546 is substantially the same as the width W1 of the shield cover 530, and does not change from the front end to the rear end. On the other hand, the second leveling member 550c has a first portion 550ca having a width W6 at its rear end and a second portion 550cb having a width W9 at its front end. At this time, the first portion 550ca is narrower than the width W9 of the second portion 550cb and narrower than the inner ring width W2 of the pair of rear wheels 400 . Therefore, a space corresponding to the difference (W9-W6) between the width W9 of the second portion 550cb and the width W6 of the first portion 550ca is generated behind the second portion 550cb. Therefore, it is possible to shorten the distance between the working rotor (not shown) and the rear wheels 400 by arranging the pair of rear wheels 400 in accordance with the space created by the difference described above.

6B, the width W6 of the first portion 550ca of the second ground leveling member 550c is narrower than the inner ring width W2 of the pair of rear wheels 400, and the first ground leveling member 546 and the first ground leveling member 546 Even if the second leveling member 550c rotates upward, it does not interfere with the rear wheel 400. - 特許庁Therefore, the working part 500c can be arranged compactly between the front wheel 300 and the rear wheel 400, and the size of the agricultural working machine 100c can be reduced.

Although the present invention has been described above with reference to the drawings, the present invention is not limited to the above-described embodiments, and can be modified as appropriate without departing from the scope of the present invention. For example, additions, deletions, or design changes made by those skilled in the art based on the agricultural work machine of each embodiment are also included in the scope of the present invention as long as they have the gist of the present invention. Furthermore, each embodiment and each modification described above can be appropriately combined as long as there is no contradiction. It is included in the form and each modification.

Even if there are other actions and effects different from the actions and effects brought about by the aspects of each embodiment and each modification described above, those that are obvious from the description of this specification or those that can be easily predicted by those skilled in the art is naturally understood to be provided by the present invention.

DESCRIPTION OF SYMBOLS 100, 100a-100c... Agricultural implement, 101... Field, 200... Frame, 210... Main frame, 220... Front wheel frame, 230... Rear wheel frame, 300... Front wheel, 400... Rear wheel, 500, 500a... Working part, 510 ... Side frame 515 ... Chain case 520 ... Work rotor 530 ... Shield cover 540, 542, 544, 546 ... First leveling member 540a, 542a, 550ca ... First portion 540b, 542b, 550cb ... Second Part 540c... Back plate 540d, 540e... Side plate 550, 550b, 550c... Second leveling member 600... Auxiliary leveling part 610... Support shaft 620... Support arm 630... Third leveling member

Claims (8)

An agricultural work machine provided with a working part for plowing a field between a front wheel and a pair of rear wheels,
The working portion includes a working rotor having a plurality of working claws, a shield cover positioned above the working rotor, and a first leveling member rotatably connected to the shield cover and positioned behind the working rotor. have
The first leveling member has a first portion at a rear end,
In plan view, the difference between the width of the working rotor and the width of the first portion is larger than the total width of the pair of rear wheels,
The agricultural implement , wherein the first portion is positioned between the pair of rear wheels during operation . 2. The agricultural implement of claim 1 , wherein the first grading member further includes a second portion having a width substantially the same as the width of the work rotor. The agricultural implement according to claim 2 , wherein the width of said first leveling member varies with a step between said first portion and said second portion. 3. The agricultural implement according to claim 2 , wherein the width of said first grading member varies with a slope between said first portion and said second portion. further comprising a second leveling member rotatably connected to the first leveling member;
The agricultural working machine according to any one of claims 1 to 4 , wherein the width of the second ground leveling member is substantially the same as the width of the first portion of the first ground leveling member or less than or equal to the width of the first portion. . The agricultural implement according to claim 5, wherein the second ground leveling member is positioned between the pair of rear wheels during operation. An agricultural work machine provided with a working part for plowing a field between a front wheel and a pair of rear wheels,
The working portion includes a working rotor having a plurality of working claws, a shield cover positioned above the working rotor, a first leveling member rotatably connected to the shield cover and positioned behind the working rotor, and a second leveling member pivotally connected to the first leveling member;
In plan view, the difference between the width of the working rotor and the width of the second leveling member is greater than the total width of the pair of rear wheels,
The agricultural implement , wherein the second ground leveling member is positioned between the pair of rear wheels during operation . The agricultural working machine according to any one of claims 1 to 7 , wherein an outer ring width of said pair of rear wheels is narrower than a width of said work rotor.

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