JP6986398B2 - Walking type farm work machine - Google Patents

Description

The present invention also relates tiller operated by an operator steering while walking tractor, the walk-agricultural machine such as a rice planting machine.

A walking farm work machine is known in which wheels and a crawler unit can be selectively attached to an axle portion protruding from the mission case of the airframe to the left and right (see Patent Document 1). According to such a walking type agricultural work machine, good running performance can be realized by selecting a wheel or a crawler unit according to the type of work. In particular, in the sowing work that requires a low ground pressure and the ridge work that requires a large traction force, the workability and work accuracy can be improved by selecting the crawler unit.

Further, the walking type agricultural work machine of Patent Document 1 is provided with a rotation restricting unit that regulates the rotation range of the crawler unit. The rotation restricting unit is composed of a crawler unit side rotation restricting member provided on the crawler unit side and a machine body side rotation restricting member provided on the machine body side.

Japanese Patent No. 5289901

However, according to Patent Document 1, since the rotation restricting member is provided on both the crawler unit side and the machine body side as the rotation restricting portion, there is a problem that the number of parts increases. Further, according to Patent Document 1, it is difficult to secure the strength of the crawler unit because the left and right rotation restricting portions are independent.

An object of the present invention is to provide a crawler unit having improved strength while suppressing the number of parts for restricting rotation. It is also an object to provide a walking farm work machine equipped with the crawler unit.

The walking type agricultural work machine of the present invention is a walking type including an aircraft provided with a mission case, an axle portion protruding to the left and right from the mission case, and a pair of crawler units attached to the left and right axle portions, respectively. In the agricultural work machine, the pair of crawler units connect the first rotation restricting member composed of one pipe connecting the pair of crawler units in front of the axle portion and the pair of crawler units behind the axle portion. A second rotation restricting member made of one pipe is provided , and when the front end portion of the crawler unit rotates upward, the first rotation restricting member comes into contact with the machine body and the rear end portion of the crawler unit is provided. Is characterized in that the second rotation restricting member comes into contact with the machine body when the crawler rotates upward.

Further, in the above-mentioned walking type agricultural work machine , the crawler unit has a plurality of feed dogs arranged along the outer peripheral portion and formed so as to project outward in a radius, and feed dogs adjacent to each other are arranged at a first interval. It has a first region and a second region in which feed dogs adjacent to each other are arranged at a second interval wider than the first interval, and is attached to the axle portion and rotates about the first rotation axis. A drive sprocket to be driven, an idler having a groove formed by denting inward in a radius along the outer peripheral portion and in which the feed dog fits, and an idler rotating about a second rotation axis, and an engaging portion engaging with the feed dog. The drive sprocket and the endless cuff band wound around the idler are provided, and the distance between the first rotation shaft and the second rotation shaft is the tooth of the feed dog in the drive sprocket. The configuration may be shorter than the sum of the first radius up to the point and the second radius up to the outer peripheral portion of the idler.

Further, in the above-mentioned walking type agricultural work machine , the second interval may be twice the first interval.

Further, in the walking type agricultural work machine , when the second region is located at a position facing the idler, the feed dog may not overlap the idler in the direction of the first rotation axis.

Further, in the walking type agricultural work machine , the crawler unit is a connecting member that rotatably supports the drive sprocket around the first rotation axis and rotatably supports the idler about the second rotation axis. The connecting member may have an urging member that urges the drive sprocket and the idler in a direction away from each other.

Further, in the walking type agricultural work machine , the tooth bottom width of the drive sprocket may be narrower than the tooth width.

Further, in the walking type agricultural work machine , in the sprocket, the protruding portion from the tooth root toward the first rotation axis protrudes in the direction of the first rotation axis and narrows in the circumferential direction toward the first rotation axis. May be.

In the above-mentioned walking type agricultural work machine, the crawler unit can be attached in place of wheels.
The maximum outer diameter of the crawler unit may be equal to the outer diameter of the wheel.

According to the present invention, by providing the rotation restricting member connecting the pair of crawler units, it is possible to improve the strength of the crawler unit while suppressing the number of parts for restricting the rotation.

It is a left side view of the management machine of one embodiment. It is a left side perspective view of a crawler unit. It is a right side perspective view of a crawler unit. It is a left side view of a crawler unit. It is a right side view of a crawler unit. It is a figure which shows the drive sprocket, (a) is the left side view, (b) is the AA sectional view of (a), (c) is the BB sectional view of (a). It is a left side view of the drive sprocket of the modification 1. It is a left side view of the three sheet metal members constituting the drive sprocket of FIG. 7, (a) is the first sheet metal member on the right side, (b) is the second sheet metal member in the center, and (c) is the third sheet metal member on the left side. It is a sheet metal member. It is a left side view of the drive sprocket of the modification 2. FIG. 9 is a left side view of the two sheet metal members constituting the drive sprocket of FIG. 9, where FIG. 9A is a right side sheet metal member and FIG. 9B is a left side sheet metal member. It is a left side view showing the arrangement of the drive sprocket and the idler in the crawler unit, (a) is the case where the 1st region is in a position facing an idler, (b) is the case where a 2nd region is in a position facing an idler. Is shown. It is a perspective view which shows the state which the left and right crawler units are connected by two rotation restricting members. FIG. 12 is a plan view of FIG. It is the left side view of the management machine which attached the wheel. It is a left side view of the drive sprocket of another form.

In the present embodiment, a walking type agricultural work machine such as a management machine, a tractor, and a rice transplanter that the operator operates while walking will be described by taking the management machine as an example. In the following description, as shown in FIG. 1, each direction of front-back, left-right, and up-down is determined with reference to the direction seen from the operator in one usage state of the management machine 1.

<Overall configuration of management machine>
FIG. 1 is a left side view of the management machine 1. The management machine 1 includes a mission case 10 arranged in the center of the front and rear of the machine body 11, an engine 20 placed on the front part of the machine body 11, and a crawler unit 3 (3L / 3R) supported by the lower part of the mission case 10. A rotary tillage device 4 arranged at the rear part of the machine body 11 to enable tilling work, and a control unit 60 arranged above the rotary tillage device 4 at the rear part of the machine body 11 are provided.

The engine 20 is a drive source. The engine 20 is fixed on the engine frame 21 fixed to the front portion of the mission case 10. The power from the engine 20 is transmitted to the mission case 10 via the belt transmission mechanism 2. The belt transmission mechanism 2 includes an output pulley 26 fixed on the output shaft of the engine 20, an input pulley 27 fixed on the input shaft portion 13 protruding from the upper portion of the mission case 10, and an input pulley 27 and an output pulley 26. It has a belt 28 wound around the belt 28 and a tension pulley 29 for tensioning or relaxing the belt 28.

The tension pulley 29 is interlocked with the main clutch lever 63. Then, the tension pulley 29 tensions the belt 28 so that power can be transmitted from the engine 20 to the transmission case 10 by the "on" operation of the main clutch lever 63, and the tension pulley is operated by the "off" operation of the main clutch lever 63. 29 relaxes the belt 28 so as to cut off the power transmission.

The mission case 10 is configured in a side view "he" shape and is arranged substantially in the center of the left and right sides of the management machine 1. A transmission (not shown) and a clutch (not shown) are housed in the mission case 10. The mission case 10 shifts the power from the engine 20 and transmits it to the crawler unit 3 and the rotary tillage device 4.

The mission case 10 supports an axle portion 12 (12L / 12R) protruding to the left and right. Crawler units 3L / 3R are fixed to the axle portions 12L / 12R. A rotary tillage device 4 is provided at the rear of the mission case 10. The rotary tillage device 4 has a tillage shaft 41 laid horizontally on the rear lower portion of the mission case 10 and a tillage claw 42 fixed on the tillage shaft 41 at intervals. Further, the rotary tilling device 4 has a tilling cover 43 that covers the upper part of the rotation locus of the tilling claw 42, and a resistance rod 44 and a tail wheel 45 provided at the rear of the tilling cover 43.

The control unit 60 is for performing various operations for traveling and working the management machine 1. The control unit 60 has a handle 61 and a speed change lever 62 protruding upward and rearward from the upper part of the mission case 10. A main clutch lever 63, a work lever 64, an accelerator lever (not shown), and the like are arranged at the rear of the handle 61. The management machine 1 can also be used in the reverse direction by rotating the handle 61 by 180 °.

<Crawler unit>
Next, the crawler unit 3 will be described by taking the crawler unit 3L on the left side as an example. Since the crawler unit 3R on the right side has a symmetrical structure with the crawler unit 3L on the left side, detailed description thereof will be omitted. 2 is a left perspective view of the crawler unit 3L, FIG. 3 is a right side perspective view of the crawler unit 3L, FIG. 4 is a left side view of the crawler unit 3L, and FIG. 5 is a right side view of the crawler unit 3L.

The crawler unit 3 has a connecting member 30 extending in the front-rear direction, a drive sprocket 31 rotatably supported by the connecting member 30 around the first rotating shaft R1, and rotating around the second rotating shaft R2 by the connecting member 30. It includes an idler 32 that can be supported and a drive sprocket 31 and an endless track 33 that is wound around the idler 32.

(Connecting member)
As shown in FIG. 3, the connecting member 30 includes an urging member 34, a support plate 35 extending rearward from the urging member 34, and a shaft portion 36 extending leftward from the front end portion of the urging member 34. As shown in FIG. 5, the urging member 34 is arranged on a straight line connecting the first rotation axis R1 and the second rotation axis R2, and expands and contracts so as to urge the drive sprocket 31 and the idler 32 in a direction away from each other. It is freely configured. The urging member 34 includes square pipes 340 and 341 fitted in a nested joint shape, a compression coil spring 342 inserted into the inner square pipe 341, and an adjusting member 343 that presses the rear end portion of the compression coil spring 342. To prepare for.

The cross section of the square pipes 340 and 341 of the present embodiment is hexagonal, but the cross-sectional shape is not particularly limited and may be a quadrangle, an octagon, or the like. By making it polygonal, the drive sprocket 31 and the idler 32 can be held in parallel without the square pipes 340 and 341 rotating with each other.

The rear end of the compression coil spring 342 projects rearward from the rear end of the square pipe 341. The adjusting member 343 is screwed into a screw hole 340a formed at the rear end of the square pipe 340. Thereby, the amount of compression of the compression coil spring 342 can be adjusted by rotating the adjusting member 343. That is, the urging force of the urging member 34 can be adjusted.

By providing the urging member 34 in the connecting member 30 in this way, the drive sprocket 31 and the idler 32 are urged in a direction away from each other, so that the crawler belt 33 can be maintained in a predetermined tension. Therefore, when a foreign substance such as a stone or mud is caught between the drive sprocket 31 or the idler 32 and the crawler belt 33, the urging member 30 contracts, so that the crawler belt 33 is suppressed from becoming abnormally tense. As a result, the load on the axle portion 12 is reduced, and damage to the gear of the transmission case 10 can be suppressed.

The support plate 35 is a member in which the first plate-shaped member 351 and the second plate-shaped member 352 are bolted in a substantially triangular shape. The first plate-shaped member 351 and the second plate-shaped member 352 have a plurality of bolt holes on the circumference centered on the first rotation shaft R1. Therefore, the first plate-shaped member 351 and the second plate-shaped member 352 can be fixed at various angles so that arbitrary bolt holes overlap. As a result, the second rotation restricting member 38, which will be described later, can be provided at various positions, and the rotation restricting range of the crawler unit 3 can be adjusted.

The front end portion of the first plate-shaped member 351 is welded to the left side surface of the square pipe 340. The first plate-shaped member 351 is formed with a circular support hole 35a that rotatably supports the hollow shaft portion 31f (see FIG. 6) of the drive sprocket 31 around the first rotation shaft R1. The shaft portion 36 penetrates and is fixed to the front end portion of the square pipe 341. By inserting the hollow shaft portion 32a (see FIG. 3) of the idler 32 into the shaft portion 36, the shaft portion 36 rotatably supports the idler 32 about the second rotation shaft R2.

(Drive sprocket)
6A and 6B are views showing the drive sprocket 31, where FIG. 6A is a left side view thereof, FIG. 6B is a sectional view taken along the line AA of FIG. 6A, and FIG. 6C is a sectional view taken along the line BB of FIG. .. The drive sprocket 31 is, for example, an integrally molded casting. As shown in FIG. 6A, the drive sprocket 31 has a plurality of feed dogs 31b (13 in FIG. 6) arranged along the outer peripheral portion 31a and formed so as to project outward in radius. Further, in the drive sprocket 31, the feed dogs 31b adjacent to each other are arranged in the first region A1 in which the feed dogs 31b are arranged in the first interval D1, and the feed dogs 31b adjacent to each other are arranged in the second interval D2 wider than the first interval D1. It has a second region A2.

In FIG. 6A, one feed dog 31b is removed, that is, the second interval D2 is twice the first interval D1. If the track 33 can be driven, the two adjacent feed dogs 31b may be removed to make the second interval D2 three times the first interval D1. Further, a plurality of second regions A2 may be provided by removing two or more feed dogs 31b at distant positions.

As shown in FIG. 6C, the tooth bottom portion 31c between the feed dogs 31b has a tapered shape that gradually narrows outward in radius. As a result, the tooth bottom width W1 is narrower than the tooth width W2. By narrowing the tooth bottom width W1 in this way, foreign matter such as stones and mud is less likely to be caught between the outer peripheral portion 31a (the tip end portion of the tooth bottom portion 31c) and the crawler belt 33.

Further, the protruding portion 31e extending from the tooth base 31d toward the first rotation axis R1 protrudes in the direction of the first rotation axis R1 and has a shape narrowed in the circumferential direction toward the first rotation axis R1. By forming the protruding portion 31e so as to be narrowed toward the first rotation axis R1 in this way, mud is less likely to collect on the side surface of the protruding portion 31e.

The drive sprocket 31 has a hollow shaft portion 31f centered on the first rotation shaft R1. By attaching adapters (not shown) of various shapes to the hollow shaft portion 31f, the crawler unit 3 can be attached to the axle portions 12 of various shapes, giving versatility to management machines having different specifications. be able to.

(Modification example 1 of drive sprocket)
The drive sprocket may be configured by stacking three sheet metal members. This drive sprocket is referred to as a modification 1. FIG. 7 is a left side view of the drive sprocket of the modified example 1. 8 is a left side view of the three sheet metal members constituting the drive sprocket of FIG. 7, where (a) is the first sheet metal member on the right side, (b) is the second sheet metal member in the center, and (c) is the left side. It is the third sheet metal member of.

As shown in FIGS. 7 and 8, the drive sprocket 70 of the modified example 1 has substantially the same shape as the above drive sprocket 31, and the first sheet metal member 71, the second sheet metal member 72, and the third sheet metal member are in order from the right. It can be produced by laminating and welding 73. The feed dog 70a of the drive sprocket 70 includes the feed dog 71a of the first sheet metal member 71 shown in FIG. 8 (a), the feed dog 72a of the second sheet metal member 72 shown in FIG. 8 (b), and FIG. 8 (c). The feed dog 73a of the third sheet metal member 73 shown in the above is overlapped with the feed dog 73a. Therefore, the tooth width of the feed dog 70a is the sum of the thicknesses of the first to third sheet metal members 71 to 73.

The tooth bottom portion 70b of the drive sprocket 70 is formed by the tooth bottom portion 72b of the second sheet metal member 72. The portion of the first sheet metal member 71 that overlaps the tooth bottom portion 72b is a notched portion 71b that is cut out in an arc shape. The portion of the third sheet metal member 73 that overlaps the tooth bottom portion 72b is a notched portion 73b that is cut out in an arc shape. Therefore, the width of the tooth bottom of the drive sprocket 70 is the thickness of the second sheet metal member 72.

The protruding portion 70c of the drive sprocket 70 is formed by the protruding portion 71c of the first sheet metal member 71 and the protruding portion 73c of the third sheet metal member 73, respectively. Therefore, the amount of protrusion of the protruding portion 70c is the thickness of the first sheet metal member 71 or the third sheet metal member 73.

(Modification example 2 of drive sprocket)
The drive sprocket may be configured by stacking two sheet metal members. This drive sprocket is referred to as a modification 2. FIG. 9 is a left side view of the drive sprocket of the modified example 2. 10A and 10B are left side views of the two sheet metal members constituting the drive sprocket of FIG. 9, where FIG. 10A is a right side sheet metal member and FIG. 10B is a left side sheet metal member.

As shown in FIGS. 9 and 10, the drive sprocket 80 of the modified example 2 has substantially the same shape as the drive sprocket 31 described above, and is manufactured by laminating and welding the right side sheet metal member 81 and the left side sheet metal member 82. be able to. The feed dog 80a of the drive sprocket 80 is formed by overlapping the feed dog 81a of the right side sheet metal member 81 shown in FIG. 10 (a) and the feed dog 82a of the left side sheet metal member 82 shown in FIG. 10 (b). Therefore, the tooth width of the feed dog 80a is the sum of the thicknesses of the right side sheet metal member 81 and the left side sheet metal member 82.

The tooth bottom portion 80b of the drive sprocket 80 is formed by the tooth bottom portion 81b of the right side sheet metal member 81. The portion of the left side sheet metal member 82 that overlaps the tooth bottom portion 81b is a notched portion 82b cut out in a trapezoidal shape. Further, the tooth bottom portion 80c adjacent to the tooth bottom portion 80b of the drive sprocket 80 is formed by the tooth bottom portion 82c of the left sheet metal member 82. The portion of the right side sheet metal member 81 that overlaps with the tooth bottom portion 82c is a notched portion 81c cut out in a trapezoidal shape. Therefore, the tooth bottom width of the drive sprocket 80 is the thickness of the right side sheet metal member 81 or the left side sheet metal member 82.

As in the modified example 1 or the modified example 2, the drive sprocket can be manufactured easily and inexpensively by stacking a plurality of sheet metal members to manufacture the drive sprocket.

(Idra)
The idler 32 is, for example, an integrally molded casting. As shown in FIG. 2 or 3, the idler 32 has a hollow shaft portion 32a and a groove portion 32c formed by being recessed inward in radius along the outer peripheral portion 32b. The groove portion 32c is a space for the feed dog 31b of the drive sprocket 31 to fit. The width of the groove portion 32c is formed so as not to interfere with the drive sprocket 31.

(Crawler)
The track 33 has an engaging portion 33a (see FIG. 13) which is a substantially rectangular through hole arranged along the rotation direction. The engaging portion 33a engages with the feed dog 31b and is rotated by the rotation of the drive sprocket 31. Then, the idler 32 is rotated by the rotation of the track 33.

(Position relationship between drive sprocket and idler)
11A and 11B are left side views showing the arrangement of the drive sprocket 31 and the idler 32 in the crawler unit 3L. FIG. 11A is a left side view showing the arrangement of the drive sprocket 31 and the idler 32. FIG. Is in a position facing the idler 32.

In the crawler unit 3L, as shown in FIG. 11A, the inter-axis distance L1 between the first rotating shaft R1 and the second rotating shaft R2 is the first radius L2 to the tip of the feed dog 31b in the drive sprocket 31. It is shorter than the sum of the idler 32 and the second radius L3 up to the outer peripheral portion 32b (L1 <L2 + L3). This means that when the first region A1 is located at a position facing the idler 32, at least the feed dog 31b overlaps with the idler 32 in the direction of the first rotation axis R1 (left-right direction in the present embodiment).

By setting L1 <L2 + L3 in this way, the front-rear length of the crawler unit 3L can be shortened, so that the turning performance is improved. Further, since the area of the portion surrounded by the drive sprocket 31, the idler 32, and the crawler belt 33 is also small, foreign matter such as stones and mud is less likely to be caught, and the crawler belt 33 can be prevented from coming off.

On the other hand, in the crawler unit 3L, as shown in FIG. 11B, when the center of the second region A2 is at a position facing the idler 32, the feed dog 31b does not overlap the idler 32 in the direction of the first rotation axis R1. .. Therefore, in the process of assembling the crawler unit 3L, when the drive sprocket 31 is engaged with the crawler belt 33 and then the idler 32 is engaged with the crawler belt 33, the idler is arranged so as to have the positional relationship as shown in FIG. 11B. By assembling 32, it does not get caught in the feed dog 31b.

As described above, since the drive sprocket 31 has the second region A2, the feed dog 31b and the idler 32 do not interfere with each other during assembly, so that the assembling property of the crawler unit 3L is improved.

<Rotation control member>
FIG. 12 is a perspective view showing a state in which the left and right crawler units 3L and 3R are connected by two rotation restricting members, and FIG. 13 is a plan view thereof. The management machine 1 has a first rotation restricting member 37 that connects the left and right crawler units 3L / 3R in front of the first rotation shaft R1 and a second that connects the left and right crawler units 3L / 3R behind the first rotation shaft R1. A rotation restricting member 38 is provided.

The first rotation restricting member 37 is a round pipe, both ends thereof are welded to the left and right support members 39, and the support member 39 is fixed to the shaft portion 36 protruding from the front end portion of the square pipe 341. Therefore, the first rotation restricting member 37 is located in front of the first rotation axis R1. The second rotation restricting member 38 is a round pipe, both ends thereof are welded to the left and right third plate-shaped members 381, and the third plate-shaped member 381 is bolted to the rear end portion of the second plate-shaped member 352. It is fixed. Therefore, the second rotation restricting member 38 is located behind the first rotation axis R1.

Then, as shown by the arrow F1 in FIG. 4, when the front end portion of the crawler unit 3 rotates upward, the first rotation restricting member 37 comes into contact with the lower part of the engine frame 21, and the crawler unit 3 rotates. Be regulated. On the other hand, as shown by the arrow F2 in FIG. 4, when the rear end portion of the crawler unit 3 rotates upward, the second regulating member 38 comes into contact with the lower part of the mission case 10, and the rotation of the crawler unit 3 is restricted. Will be done. Further, as described above, the position of the second rotation restricting member 38 can be changed by changing the fixing position of the second plate-shaped member 352 with respect to the first plate-shaped member 351. It is possible to adjust the rotation restriction range when the crawler rotates upward.

In this way, the first rotation restricting member 37 and the second rotation restricting member 38 prevent the crawler unit 3 from rotating during traveling. Therefore, since the crawler unit 3 can rotate to some extent, it can follow the unevenness of the ground during traveling, and since excessive rotation is restricted, it can travel normally without rotating.

Further, by connecting the left and right crawler units 3L / 3R with the first rotation restricting member 37 and the second rotation restricting member 38, the strength of the crawler unit 3 is improved. Further, the crawler unit 3 can be attached to the management machines having different lengths of the axle portions 12 by using the first rotation restricting member 37 and the second rotation restricting member 38 having different lengths.

<Management machine with wheels attached>
The crawler unit 3 can be attached in place of the wheel. FIG. 14 is a left side view of the management machine 1 to which the wheels are attached. The outer diameter E2 of the wheel 90 and the maximum outer diameter E1 of the crawler unit 3 (see FIG. 4) are equivalent.

When the maximum outer diameter E1 of the crawler unit 3 is smaller than the wheel 90, the traveling speed becomes slow when the crawler unit 3 is used if the gear ratio remains the same, but the maximum outer diameter E1 of the crawler unit 3 is outside the wheel 90. By making the diameter E2 the same, the traveling speed becomes the same when the crawler unit 3 is used even if the gear ratio remains the same. Therefore, it can be used normally only by attaching the crawler unit 3 instead of the wheel 90.

Further, when designing a management machine to which only the crawler unit 3 is attached, the design can be the same as that of the management machine to which the wheels 90 are attached, and the design can be easily changed.

<Others>
FIG. 15 is a left side view of another form of drive sprocket. As shown in FIG. 15, the drive sprocket 311 has a plurality of feed dogs 31b formed evenly arranged along the entire circumference of the outer peripheral portion 31a and projecting outward in radius. Such a drive sprocket 311 can also be used in place of the drive sprocket 31 described above.

1 Management machine (walking farm work machine)
3 Crawler unit 10 Mission case 11 Airframe 12 Axle 30 Connecting member 31, 70, 80 Drive sprocket 31a Outer circumference 31b, 70a, 80a Feeding tooth 31d Tooth root 31e, 70c Protruding part 32 Idler 32b Outer circumference 32c Groove 33 crawler Joint part 34 Bounce member 37 First rotation control member (rotation control member)
38 Second rotation restricting member (rotation restricting member)
90 Wheels A1 1st area A2 2nd area D1 1st interval D2 2nd interval E1 Maximum outer diameter of crawler unit E2 Wheel outer diameter L1 Axis distance L2 1st radius L3 2nd radius R1 1st rotation axis R2 2nd Rotation axis W1 Tooth bottom width W2 Tooth width

Claims (8)

The aircraft equipped with the mission case and
Axle parts protruding from the mission case to the left and right,
In a walking farm work machine equipped with a pair of crawler units attached to the left and right axles, respectively.
The pair of crawler units
A first rotation restricting member composed of one pipe connecting the pair of crawler units in front of the axle portion, and a second rotation restricting member composed of one pipe connecting the pair of crawler units behind the axle portion. equipped with a door,
When the front end portion of the crawler unit rotates upward, the first rotation restricting member comes into contact with the airframe.
A walking-type agricultural work machine characterized in that when the rear end portion of the crawler unit rotates upward, the second rotation restricting member comes into contact with the machine body . The crawler unit is
A first region having a plurality of feed dogs arranged along the outer peripheral portion and formed so as to project outward in radius, and feed dogs adjacent to each other at a first interval, and feed dogs adjacent to each other are described above. A drive sprocket having a second region arranged at a second interval wider than the first interval, attached to the axle portion and rotating around the first rotation axis, and a drive sprocket.
An idler that is formed by denting inward in the radius along the outer peripheral portion and has a groove portion into which the feed dog fits, and rotates about a second rotation axis.
It has an engaging portion that engages the feed dog, includes the drive sprocket and endless tracks wound around the idler.
The distance between the first rotating shaft and the second rotating shaft is shorter than the sum of the first radius to the tip of the feed dog in the drive sprocket and the second radius to the outer peripheral portion in the idler. The walk-behind farm work machine according to claim 1, wherein the walking type agricultural work machine is characterized by the above-mentioned. The walkable agricultural work machine according to claim 2, wherein the second interval is twice the first interval. The walking type agricultural work machine according to claim 2 or 3, wherein when the second region is located at a position facing the idler, the feed dog does not overlap the idler in the direction of the first rotation axis. .. The crawler unit includes a connecting member that rotatably supports the drive sprocket around the first rotation axis and rotatably supports the idler about the second rotation axis.
The walking type agricultural work machine according to any one of claims 2 to 4, wherein the connecting member has an urging member that urges the drive sprocket and the idler in a direction away from each other. The walking farming machine according to any one of claims 2 to 5, wherein the drive sprocket has a tooth bottom width narrower than the tooth width. The claim is characterized in that, in the drive sprocket, the protruding portion from the tooth root toward the first rotation axis protrudes in the direction of the first rotation axis and narrows in the circumferential direction toward the first rotation axis. Item 6. The walking type agricultural work machine according to Item 6. The crawler unit can be attached in place of the wheel and can be attached.
The walkable agricultural work machine according to any one of claims 1 to 7, wherein the maximum outer diameter of the crawler unit is made equal to the outer diameter of the wheel.

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