JP7417253B2 - agricultural machinery - Google Patents

Description

The present invention relates to an agricultural machine. In particular, the present invention relates to a self-propelled agricultural machine.

Currently, in order to reduce labor time in agricultural work, automation of agricultural machinery is progressing, and various agricultural machinery is being developed. In particular, agricultural implements (tillers and puddling machines) that are attached to the rear of a running machine such as a tractor and can be replaced depending on the type of work such as plowing or puddling are used as attachments to the running machine such as a tractor. It is possible to handle various types of agricultural work just by replacing them, and it greatly contributes to reducing the cost of agricultural work.

In particular, in recent years, development of self-propelled agricultural machinery that performs unmanned agricultural work has been progressing. Currently, the development of unmanned, self-propelled agricultural machinery is proceeding mainly with a traveling machine.For example, when agricultural work such as plowing and plowing is to be carried out unmanned, the only option is to have a structure in which these machines are towed by a running machine. (For example, Patent Document 1).

JP2018-201444A

In the case of a towed agricultural machine like the one disclosed in Patent Document 1, the work efficiency is good in large-area fields, but when there are many small-area fields spread out, the overall work is reduced due to the large number of fields. Because the ratio of the time required for moving between fields to the total time increases, efficient work cannot be performed. Furthermore, since the agricultural machinery mentioned above is very large, it was necessary to prepare a large truck to move it.

The present invention has been made in view of these problems, and an object of the present invention is to realize a self-propelled agricultural machine with a new configuration that does not require traction by a traveling body.

The agricultural machine (100) in one embodiment of the present invention includes a front wheel (300), a rear wheel (400), and a working part (500) that is provided between the front wheel and the rear wheel and plows a field. The vehicle includes a variable wheelbase mechanism (600) that changes the distance between the front wheels and the rear wheels.

A main frame (210), a front wheel frame (220) extending downward from the main frame to support the front wheel, and a rear wheel frame (230) extending downward from the main frame to support the rear wheel. The variable wheel base mechanism may further include a variable wheel base mechanism that changes the inclination of at least one of the front wheel frame and the rear wheel frame with respect to the main frame.

The variable wheelbase mechanism may raise the working portion in conjunction with an operation that shortens the distance between the front wheel and the rear wheel.

It further includes a ground leveling member (700B) provided behind the rear wheel, and an elevating mechanism (800B) connected to the main frame and the rear wheel frame, and the elevating mechanism The ground leveling member may be raised in conjunction with the operation of changing the inclination of the rear wheel frame.

According to the present invention, it is possible to realize a self-propelled agricultural machine with a new configuration that does not require towing by a traveling machine body.

1 is a side view showing the configuration of an agricultural machine according to an embodiment of the present invention. 1 is a side view showing the configuration of an agricultural machine according to an embodiment of the present invention. FIG. 2 is a side view showing a detailed configuration of a variable wheelbase mechanism in an agricultural machine according to an embodiment of the present invention. 1 is a side view showing the configuration of an agricultural machine according to an embodiment of the present invention. FIG. 2 is a side view showing a detailed configuration of a variable wheelbase mechanism in an agricultural machine according to an embodiment of the present invention.

Hereinafter, the agricultural machine of the present invention will be explained with reference to the drawings. However, the agricultural machine of the present invention can be implemented in many different embodiments, and should not be construed as being limited to the contents described in the examples shown 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 an alphabetical letter after the same reference numerals, and repeated explanations thereof will be omitted.

In the specification and claims of the present application, "above" indicates a direction vertically away from the field, and "bottom" indicates a direction vertically toward the field. Further, "front" indicates the direction in which the agricultural machine moves while working on the field, and "back" indicates the direction 180° opposite to the front. Moreover, "left" or "right" indicates the left-right direction when the agricultural machine is facing forward.

In addition, in the specification and claims of the present application, when the center line (line parallel to the traveling direction) of the agricultural machine in plan view is used as a reference, the side relatively close to the center line is referred to as the "inside". , the side far from the center is called the "outside". “Plowing” includes at least “plowing,” “cultivating,” and “crushed soil.”

In the following embodiments, a plowing machine will be exemplified as a representative example of the agricultural working machine, but the present invention is not limited to this example. For example, in addition to puddling machines, the present invention can be applied to agricultural machines for cultivating fields, such as tillers and soil crushers. Further, unless a particular technical contradiction arises, techniques between different embodiments can be combined. In addition, unless a particular technical contradiction arises, the technical idea cited as a modification of a certain embodiment can be applied to other embodiments.

[First embodiment]
The agricultural work machine 100 of this embodiment is a self-propelled work machine that performs work unmanned while moving forward. When the agricultural machine 100 is in the working state of plowing a field, it is necessary to ensure a certain distance (wheelbase) between the front wheels and the rear wheels in consideration of the work and running stability during the work. On the other hand, in a turning state in which the agricultural machine 100 turns, it is necessary to reduce the wheelbase in order to reduce the radius of curvature of the turning. In particular, when the agricultural machine 100 employs a skid steer system in which turning is performed using a rotational difference between left and right drive wheels, it is preferable that the positional relationship between the front, rear, left, and right four wheels in plan view be as close to a square as possible. As mentioned above, in order to achieve both stable agricultural work and excellent turning performance, it is desirable to have a configuration in which the wheelbase can be adjusted during agricultural work.

[Configuration of agricultural machine 100]
FIG. 1 is a side view showing the configuration of an agricultural machine according to an embodiment of the present invention. As shown in FIG. 1, the agricultural machine 100 includes a frame 200, a front wheel 300, a rear wheel 400, a working part 500, and a variable wheelbase mechanism 600. A straight line 101 in FIG. 1 is a straight line connecting the lower ends of each of the front wheel 300 and the rear wheel 400. Straight line 103 is a straight line that indicates the surface of a field that is assumed when agricultural machine 100 works in the field. FIG. 1A shows a working state in which the variable wheelbase mechanism 600 is extended, and FIG. 1B shows a turning state in which the variable wheelbase mechanism 600 is contracted.

The frame 200 includes a main frame 210, a front wheel frame 220, and a rear wheel frame 230. Although not shown, the front wheel frame 220 and the rear wheel frame 230 are provided as a pair (two) on the left and right, respectively. The main frame 210 is a member that constitutes the skeleton of the agricultural machine 100. The main frame 210 is provided between the front wheel 300 and the rear wheel 400 and is expandable and contractible in a direction that connects the front wheel 300 and the rear wheel 400. The main frame 210 includes a first frame 211 and a second frame 213. The second frame 213 is slidably connected to the first frame 211. In FIG. 1, the second frame 213 slides by nesting inside the first frame 211. However, the sliding movement between the first frame 211 and the second frame 213 is not limited to the above configuration.

At least one of the first frame 211 and the second frame 213 may be provided with a sliding member that slides on the first frame 211 or the second frame 213. The sliding member is provided in a part of the region where the first frame 211 and the second frame 213 overlap in a side view or a top view. With this sliding member, the sliding area during the above-mentioned sliding movement can be reduced, and as a result, the frictional resistance during the above-mentioned sliding movement can be reduced. A resin material may be used as the sliding member. For example, between the first frame 211 and the second frame 213, sliding members may be provided at the open end of the first frame 211 and the tip of the second frame 213.

The pair of front wheel frames 220 are connected to the front side (first frame 211) of the main frame 210 and extend forward and downward from the main frame 210. Each front wheel frame 220 supports a front wheel 300 near its lower end. The pair of rear wheel frames 230 are connected to the rear side (second frame 213) of the main frame 210 and extend rearward and downward from the main frame 210. Each rear wheel frame 230 supports the rear wheel 400 near its lower end. The front wheel frame 220 and the rear wheel frame 230 are fixed to the main frame 210. Specifically, the front wheel frame 220 is fixed to the first frame 211, and the rear wheel frame 230 is fixed to the second frame 213. In other words, the inclinations of the front wheel frame 220 and the rear wheel frame 230 in the extending direction with respect to the expansion/contraction direction of the main frame 210 are fixed.

Wheelbase variable mechanism 600 includes a cylinder. The cylinder has a cylinder tube 611 and a piston rod 613. The variable wheelbase mechanism 600 is connected to the main frame 210. Specifically, an end (front end) of the cylinder tube 611 is connected to a mounting portion 215 fixed to the first frame 211. An end (rear end) of the piston rod 613 is connected to a mounting portion 217 fixed to the second frame 213. The variable wheelbase mechanism 600 is a power source that expands and contracts in the longitudinal direction (the direction connecting the front wheels 300 and the rear wheels 400), and as the variable wheelbase mechanism 600 expands and contracts, the main frame 210 expands and contracts. Specifically, the variable wheelbase mechanism 600 contracts and the second frame 213 slides relative to the first frame 211, thereby shortening the distance between the front wheels 300 and the rear wheels 400. In other words, the wheelbase changes depending on the above configuration.

Working section 500 is provided between front wheel 300 and rear wheel 400. In other words, the agricultural working machine 100 is a mid-mount type agricultural working machine. For example, the working unit 500 is a member that performs operations such as plowing, tilling, and crushing soil. The work unit 500 may have the function of performing multiple tasks among the above tasks. The working unit 500 is connected (supported) to the main frame 210 via a connecting member 590. Specifically, the upper end of the connecting member 590 is connected to the main frame 210, and the lower end of the connecting member 590 is connected to the working part 500. Although not shown, the connection member 590 is provided with a working part elevating mechanism that moves the working part 500 up and down. There is.

In a state in which the working part 500 has moved upward, a portion of the connecting member 590 may protrude above the main frame 210. Further, the working part elevating mechanism may raise and lower the working part 500 as the variable wheel base mechanism 600 expands and contracts. For example, the main frame 210 and the working part 500 or the variable wheelbase mechanism 600 and the working part 500 are connected by a link mechanism, and as the main frame 210 and the variable wheelbase mechanism 600 contract, the corresponding A linkage mechanism may raise the working part 500. The working part elevating mechanism may raise the working part 500 when the variable wheelbase mechanism 600 is retracted, and the working part elevating mechanism may lower the working part 500 when the variable wheelbase mechanism 600 is extended.

The working section 500 includes a frame 510, a rotor 520, a shield cover 530, and an apron 540. The working unit 500 may include a ground leveling member rotatably connected to the apron 540 further behind the apron 540. The rotor 520 is rotatably attached to the frame 510. The rotor 520 has a rotating claw shaft and a plurality of working claws attached to the claw shaft, and plows or stirs the field in a predetermined working width while rotating the working claws. The apron 540 is provided behind the rotor 520 so as to be rotatable with respect to the shield cover 530. Note that since the positional relationship between the shield cover 530 and the frame 510 is fixed, the shield cover 530 can also be considered as a part of the frame 510. By contacting the field, the apron 540 levels the field that has been plowed or stirred by the work performed by the rotor 520.

Although not shown, the main frame 210 is provided with various functional members for operating the agricultural machine 100. Various functional members include, for example, an engine, a transmission, a turning mechanism, a drive control mechanism, a communication mechanism, and a fuel tank. A communication mechanism receives control signals from the server or the remote control by communicating with the server. A drive control mechanism drives the engine, transmission, and swing mechanism based on control signals received from the server. Automatic running of the agricultural machine 100 is performed by these operations. 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.

As described above, according to the agricultural working machine according to the present embodiment, the wheelbase of the mid-mount agricultural working machine can be changed between the working state and the turning state. With this configuration, it is possible to obtain stable performance during work and high-performance turning performance that allows for small turns. Furthermore, by reducing the wheelbase, the agricultural machine 100 can be downsized, and it becomes possible to transport the agricultural machine 100 using a light truck or the like.

Moreover, since the working part 500 is located between the front wheel 300 and the rear wheel 400, the weight balance in the front-rear direction of the agricultural working machine 100 is stabilized, and the movement of the agricultural working machine 100 can be stabilized.

[Second embodiment]
An agricultural machine 100A according to the second embodiment will be described using FIGS. 2 and 3. The agricultural machine 100A according to the second embodiment is similar to the agricultural machine 100 according to the first embodiment, but the front wheel frame 220A and the rear wheel frame 230A are rotatably connected to the main frame 210A. This is different from the agricultural machine 100 in this point. In the following description, detailed description of structures similar to those of the first embodiment may be omitted. FIG. 2 is a side view showing the configuration of an agricultural machine according to an embodiment of the present invention. FIG. 3 is a side view showing the detailed configuration of the variable wheelbase mechanism in the agricultural machine according to the embodiment of the present invention. (A) of FIGS. 2 and 3 shows a working state in which the wheelbase variable mechanism 600A is contracted and the wheelbase becomes larger, and (B) shows a turning state in which the wheelbase variable mechanism 600A is extended and the wheelbase becomes smaller. Indicates the condition.

[Configuration of agricultural machine 100A]
As shown in FIG. 2, each of the front wheel frame 220A and the rear wheel frame 230A of the agricultural working machine 100A is rotatably connected to the main frame 210A. The upper end of the front wheel frame 220A is connected to the main frame 210A at a connecting portion 221A. The upper end of the rear wheel frame 230A is connected to the main frame 210A at a connecting portion 231A. The connecting portion 221A is provided in front of the working portion 500A, and the connecting portion 231A is provided in the rear of the working portion 500A. The front wheel frame 220A extends downward and forward from the connecting portion 221A. The rear wheel frame 230A extends downward and rearward from the connecting portion 231A.

The agricultural machine 100A includes a variable wheelbase mechanism 600A. The variable wheelbase mechanism 600A includes a first variable wheelbase mechanism 620A and a second variable wheelbase mechanism 630A. The first wheelbase variable mechanism 620A rotates the front wheel frame 220A. The second variable wheel base mechanism 630A rotates the rear wheel frame 230A. The first variable wheel base mechanism 620A and the second variable wheel base mechanism 630A may be interlocked with each other, or each may operate independently. In this embodiment, a configuration in which both are linked is illustrated.

The first wheelbase variable mechanism 620A is rotatably connected to each of the main frame 210A and the front wheel frame 220A. Specifically, one end (upper and rear end) of the first wheelbase variable mechanism 620A is rotatably connected to a mounting portion 215A fixed to the main frame 210A. The other end (lower and front end) of the first variable wheel base mechanism 620A is rotatably connected to the front wheel frame 220A. The second variable wheel base mechanism 630A is rotatably connected to the main frame 210A and the rear wheel frame 230A. Specifically, one end (upper and front end) of the second variable wheel base mechanism 630A is rotatably connected to a mounting portion 217A fixed to the main frame 210A. The other end (lower and rear end) of the second variable wheel base mechanism 630A is rotatably connected to the rear wheel frame 230A.

When the first variable wheel base mechanism 620A extends from the state shown in (A) to the state shown in FIG. The main frame 210A becomes shorter and the front of the main frame 210A rises. When the second wheelbase variable mechanism 630A extends in the same manner as above, the inclination of the rear wheel frame 230A with respect to the main frame 210A changes, the distance between the front wheel 300A and the rear wheel 400A becomes shorter, and the rear of the main frame 210A rises. . In FIG. 2, since both wheelbase variable mechanisms extend in conjunction with each other, the main frame 210A rises parallel to the field surface. In other words, the first variable wheelbase mechanism 620A and the second variable wheelbase mechanism 630A raise the working part 500A in conjunction with the operation of shortening the distance between the front wheel 300A and the rear wheel 400A.

FIG. 3 is an enlarged view of the second variable wheel base mechanism 630A of FIG. 2. As shown in FIG. 3, the second variable wheel base mechanism 630A includes a cylinder tube 631A and a piston rod 633A. The upper end of the cylinder tube 631A is rotatably connected to a mounting portion 217A fixed to the main frame 210A. The lower end of the piston rod 633A is rotatably connected to a mounting portion 219A fixed to the rear wheel frame 230A. When the second variable wheel base mechanism 630A extends from the state shown in FIG. 3A to the state shown in FIG. It rotates downward around the moving axis 218A.

As described above, according to the agricultural working machine 100A according to the present embodiment, in addition to the same effects as the agricultural working machine 100 according to the first embodiment, the wheel base can be reduced and the working part 500A can be raised. For example, when the agricultural machine 100A turns, the working part 500A is turned away from the field, but it is possible to reduce the wheel base for turning and raise the working part 500A by using a common power source for both. can.

Note that among the pair of front wheel frames 220A and the pair of rear wheel frames 230A, only one front wheel frame 220A or one rear wheel frame 230A may be rotatably connected to the main frame 210A. By rotatably connecting only one of the front wheel frame 220A and the rear wheel frame 230A in the left-right direction to the main frame 210A, the attitude of the agricultural machine 100A in the width direction (left-right direction) can also be controlled. This improves the ground contact of the front wheels 300A or the rear wheels 400A with respect to the field, prevents the front wheels 300A or the rear wheels 400A from lifting even if the field is rough, and further improves stability during work. I can do it.

[Third embodiment]
A farm machine 100B according to a third embodiment will be described using FIGS. 4 and 5. The agricultural machine 100B according to the third embodiment is similar to the agricultural machine 100 according to the first embodiment, except that only the rear wheel frame 230B is rotatably connected to the main frame 210B. It differs from the agricultural machine 100 in that the wheel frame 230B is longer than the front wheel frame 220B, and that a ground leveling member 700B that moves up and down in conjunction with the rotation of the rear wheel frame 230B is provided further behind the rear wheel 400B. . In the following description, detailed description of structures similar to those of the first embodiment may be omitted. FIG. 4 is a side view showing the configuration of an agricultural machine according to an embodiment of the present invention. FIG. 5 is a side view showing the detailed configuration of the variable wheelbase mechanism in the agricultural machine according to the embodiment of the present invention. (A) of FIGS. 4 and 5 shows a working state in which the variable wheel base mechanism 630B is retracted, and (B) shows a turning state in which the variable wheel base mechanism 630B is extended.

[Configuration of agricultural machine 100B]
In the agricultural machine 100B shown in FIG. 4, the upper end of the front wheel frame 220B is fixed to the main frame 210B, whereas the upper end of the rear wheel frame 230B is rotatable with respect to the main frame 210B at the connecting portion 231B. It is connected to the. The agricultural machine 100B includes a variable wheelbase mechanism 630B only for the rear wheel frame 230B.

Similar to the agricultural machine 100A in FIG. 2, the inclination of the rear wheel frame 230B with respect to the main frame 210B changes as the variable wheel base mechanism 630B expands and contracts. In the case of this embodiment, the front wheel frame 220B is fixed to the main frame 210B, so when the variable wheelbase mechanism 630B extends, the height changes only at the rear of the agricultural machine 100B, and the height at the front side of the agricultural machine 100B changes. does not change. As a result, the agricultural machine 100B assumes a posture tilted forward.

The agricultural machine 100B includes a ground leveling member 700B that moves up and down in conjunction with the rotation of the rear wheel frame 230B, further behind the rear wheel 400B. The ground leveling member 700B is connected to the rear wheel frame 230B and the main frame 210B via a lifting mechanism 800B. The lifting mechanism 800B moves the ground leveling member 700B up and down in response to the operation of the variable wheel base mechanism 630B. That is, the elevating mechanism 800B raises the ground leveling member 700B in conjunction with the operation of changing the inclination of the rear wheel frame 230B with respect to the main frame 210B. In the working state shown in FIG. 4(A), the ground leveling member 700B is lowered, and in the turning state shown in FIG. 4(B), the ground leveling member 700B is raised.

Note that since the rear wheel frame 230B is longer than the front wheel frame 220B, the working section 500B and the ground leveling member 700B can be raised to a sufficient height by changing the inclination of the rear wheel frame 230B.

[Configuration of lifting mechanism 800B]
FIG. 5 is an enlarged view of the variable wheel base mechanism 630B and the lifting mechanism 800B of FIG. 4. The configuration of the variable wheelbase mechanism 630B is the same as the configuration of the second variable wheelbase mechanism 630A in FIG. 3, so the explanation will be omitted. FIG. 5A shows a side view of the elevating mechanism 800B in the descending state (working state). FIG. 5B shows a side view of the elevating mechanism 800B in the ascending state (swivel state).

As shown in FIG. 5, the parallel link 810B has an upper link arm 811B and a lower link arm 813B. Two pairs of upper link arms 811B and lower link arms 813B are provided, and each pair is provided on the left and right with respect to the center line (line parallel to the traveling direction) of the agricultural working machine 100B. One end (upper and front end) of the upper link arm 811B is rotatably connected to the rotation regulating portion 840B at the connecting portion 815B. The other end (lower and rear end) of the upper link arm 811B is rotatably connected to the ground leveling member 700B at a connecting portion 819B. One end (upper and front end) of the lower link arm 813B is rotatably connected to the rear wheel frame 230B and the rotation restriction portion 840B at a connecting portion 817B. The other end (lower and rear end) of the lower link arm 813B is rotatably connected to the ground leveling member 700B at a connecting portion 821B. The upper link arm 811B and the lower link arm 813B extend substantially parallel to each other from one end to the other end. Note that the rotation restricting portion 840B is rotatably connected to the rear wheel frame 230B at a connecting portion 817B. Although not shown, the rotation restricting portion 840B is connected to a connecting frame provided so as to span between the pair of rear wheel frames 230B.

The shape connecting the four points of the connecting portions 815B, 817B, 819B, and 821B is approximately a parallelogram. With this configuration, the parallel links 810B constitute a parallelogram-shaped rotation mechanism with the respective connecting portions as vertices. Among the above four vertices, the connecting portions 815B and 817B are connected to the rotation regulating portion 840B, and the connecting portions 819B and 821B are connected to the ground leveling member 700B. This rotation mechanism allows the parallel link 810B to move the earth leveling member 700B up and down while maintaining the inclination of the earth leveling member 700B with respect to the rotation regulating portion 840B. In addition, in this embodiment, although the parallel link 810B illustrated the structure connected to the rear wheel frame 230B, the parallel link 810B may be connected to the main frame 210B.

One end (lower and rear end) of the link rod 920B is connected to a connecting portion 843B provided at the upper end of the rotation regulating portion 840B. That is, when the link rod 920B is pulled forward and upward, the rotation restricting portion 840B rotates upward around the connecting portion 817B. The rotation regulating portion 840B has a locking portion 845B. The rotation regulating portion 840B is composed of two plate-like members that sandwich the upper link arm 811B from the left and right sides, and the locking portion 845B is provided between these plate-like members. The rotation restriction portion 840B is provided so as to be able to lock onto the upper link arm 811B, but is not provided on the lower link arm 813B. In the states shown in FIGS. 5A and 5B, the locking portion 845B locks the upper link arm 811B by contacting the upper link arm 811B from below. That is, when the rotation restricting portion 840B rotates upward, the upper link arm 811B rotates upward due to the locking portion 845B.

The other end (upper and front end) of the link rod 920B is rotatably connected to the main frame 210B. When the variable wheel base mechanism 630B extends, the rear wheel frame 230B rotates downward, and the angle θ between the main frame 210B and the rear wheel frame 230B increases. The link rod 920B is pulled upward and forward, and the rotation restricting portion 840B rotates upward about the connecting portion 817B. As a result, the upper link arm 811B is lifted by the locking portion 845B, and the ground leveling member 700B rises. In this way, the wheelbase variable mechanism 630B can reduce the wheelbase by changing the inclination of the rear wheel frame 230B with respect to the main frame 210B, and can raise the ground leveling member 700B in conjunction with this operation.

Note that, as described above, the rotation restriction portion 840B restricts the downward rotation of the upper link arm 811B, but does not restrict the upward rotation. Therefore, in the working state of FIG. 5A, the upper link arm 811B is rotatable upward, so that the ground leveling member 700B can be lifted upward.

When the wheelbase variable mechanism 630B changes the inclination of the rear wheel frame 230B with respect to the main frame 210B, the working part 500B also inclines forward. At this time, since the direction of the load applied to the apron 540B also changes, a member may be provided to restrict rotation of the apron 540B. For example, a mechanism may be provided that restricts the rotation of the apron 540B in conjunction with the extension of the variable wheel base mechanism 630B.

As described above, according to the agricultural working machine 100B according to the present embodiment, in addition to the same effects as the agricultural working machines 100 and 100A according to the first embodiment and the second embodiment, the wheel base is made smaller and the working part 500B is raised. At the same time, the ground leveling member 700B can be raised. For example, when the agricultural machine 100B turns, the working part 500B and the ground leveling member 700B are turned away from the field, but the reduction of the wheel base and the raising of the working part 500B and the ground leveling member 700B for turning are common to these members. This can be realized using a power source that

Further, by providing the ground leveling member 700B behind the rear wheel 400B, it is possible to level out the ruts caused by the rear wheel 400B after the work of the working section 500B. With such a configuration, it is possible to realize a self-propelled agricultural machine with a new configuration that does not require towing by a traveling body.

In addition, in the above-mentioned embodiment, although the structure in which the grounding member provided in the ground leveling member 700B is a plate-shaped member is illustrated, it is not limited to this structure. For example, these grounding members may be other members capable of leveling ruts, such as rollers, cage rollers, and Cambridge rollers, in addition to plate-shaped members.

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 spirit of the present invention. For example, a work machine in which a person skilled in the art appropriately adds, deletes, or changes the design of components based on the work machine of this embodiment is also included in the scope of the present invention as long as it has the gist of the present invention. Furthermore, the embodiments described above can be combined as appropriate as long as there is no mutual contradiction, and technical matters common to each embodiment are included in each embodiment even if not explicitly stated.

Even if there are other effects that are different from those brought about by the aspects of each embodiment described above, those that are obvious from the description of this specification or that can be easily predicted by a person skilled in the art will naturally be included. It is understood that this is brought about by the present invention.

100: agricultural machine, 101: straight line, 200: frame, 210: main frame, 211: first frame, 213: second frame, 215, 217, 219A: mounting part, 218A: rotation axis, 220: front wheel frame, 221A, 231A: Connection part, 230: Rear wheel frame, 300: Front wheel, 400: Rear wheel, 500: Working part, 510: Frame, 520: Rotor, 530: Shield cover, 540: Apron, 590: Connection member, 600 , 630B: Variable wheel base mechanism, 611, 631A: Cylinder tube, 613, 633A: Piston rod, 700B: Leveling member, 800B: Lifting mechanism, 810B: Parallel link, 811B: Upper link arm, 813B: Lower link arm, 815B, 817B, 819B, 821B, 843B: Connection section, 840B: Rotation restriction section, 845B: Locking section, 920B: Link rod

Claims (1)

a main frame including a first frame and a second frame connected to be slidably movable in the front-rear direction;
a front wheel frame connected to the first frame;
a rear wheel frame connected to the second frame;
a front wheel supported by the front wheel frame;
a rear wheel supported by the rear wheel frame;
a working unit that is provided between the front wheel and the rear wheel and plows the field;
a variable wheelbase mechanism that changes the distance between the front wheel and the rear wheel;
has
The wheelbase variable mechanism is an agricultural working machine that slides the first frame and the second frame and raises the working part in conjunction with an operation that shortens the distance between the front wheel and the rear wheel .

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