JP2017093323A - Walking type rice transplanter - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a walking type rice transplanter separating a planting row adjacent right/left to a right/left wheel from a passage mark of the right/left wheel when planting arms are arranged side by side in a right/left direction at a rear part of a machine body so as to form a small planting inter-row.SOLUTION: An edge 8e on a support case 7 side of a lag part 8d of a wheel 8 is located on the support case 7 side with respect to an axle part 8a of the wheel 8. In a flange part 36a of a pipe part 36 of the support case 7 and a connection part 35a of a front case 35 of the support case 7, a right/left center CL1 of the pipe part 36 is located on a machine body center side with respect to a right/left center CL2 of the connection part 35a in a plane view.SELECTED DRAWING: Figure 3

Description

  The present invention relates to a walking type rice transplanter having right and left wheels for traveling.

Some walking rice transplanters are configured as follows, as disclosed in Patent Document 1.
A mission case (21 in FIGS. 1 and 2 of Patent Document 1) is provided at the front of the airframe, and a pipe-shaped right (left) support case (Patent Document 1) is provided on the right part (left part) of the mission case. 10 of FIG. 1 and FIG. 2 are supported so as to be swingable up and down around the horizontal axis in the left-right direction and extend rearward.
The right wheel for traveling (1 in FIG. 1 and FIG. 2 of Patent Document 1) is rotatably supported on the right portion of the rear end portion of the right support case, and on the left portion of the rear end portion of the left support case. A left wheel for traveling (1 in FIGS. 1 and 2 of Patent Document 1) is rotatably supported.

JP 2006-238824 A

In the walking type rice transplanter, the planting arms that take out the seedlings from the seedling stand and plant them on the rice field are arranged side by side in the left and right direction at the rear of the aircraft, planting at a position away from the wheel trace in the left and right direction The arm is configured to plant seedlings.
In this case, the spacing between adjacent planting strips (rows along the traveling direction of the body of seedlings planted on the surface by the planting arm) is set to a large one, for example, 300 mm. .

In recent years, there has been a demand for planting seedlings so that the spacing between the planting strips is 250 mm, for example.
As a result, if the planting arms are arranged side by side in the left-right direction at the rear of the aircraft so as to be between small planting strips, the planting arm may be in a state of planting seedlings at a position near the passing trace of the wheels. (There is a case where the planting strip on the right side of the right wheel is close to the passage mark of the right wheel, and the planting strip on the left side of the left wheel is close to the passage track of the left wheel. Sometimes).
In this case, since the passing trace of the wheel is rough, if the planting arm plants the seedling at a position close to the passing trace of the wheel as described above, the seedling may fall after planting.

  In the walking type rice transplanter, when the planting arms are arranged in the left-right direction at the rear part of the aircraft so as to be between the small planting strips, the planting strip adjacent to the right wheel is placed on the right wheel. It is intended to be configured so that it can be appropriately separated from the passage mark and the planting strip on the left side of the left wheel can be appropriately separated from the passage mark of the left wheel.

[I]
(Constitution)
The first feature of the present invention is that the walking type rice transplanter is configured as follows.
A mission case is provided at the front of the aircraft,
The right and left support cases are provided on the right and left sides of the transmission case, and are supported by right and left support cases that are supported so as to be swingable up and down around a horizontal axis in the left-right direction and extend rearward. The right wheel for traveling is rotatably supported on the right part of the rear part of the case, and the left wheel for traveling is rotatably supported on the left part of the rear part of the left support case,
A front case that is swingably supported by the transmission case, a pipe portion that is connected to the front case and extends rearward, and a rear portion of the pipe portion. And a rear case that rotatably supports the right and left rear wheels,
An axle part rotatably supported by the rear case on the right and left wheels, a spoke part connected to the axle part and extending radially outward of the wheel, and an outer end of the spoke part A ring-shaped rim portion connected to the rim portion, and a lug portion that is wider than the rim portion and connected to the rim portion, and the end portion on the support case side of the lug portion in plan view, It is located on the support case side from the axle part,
The pipe part is configured in a square pipe shape having a quadrangular cross section, and the pipe part is arranged so that the side surface on the wheel side of the pipe part is along the vertical direction,
In the flange portion of the pipe portion and the connecting portion of the front case to which the flange portion is connected, the left and right center of the pipe portion is positioned on the machine body center side with respect to the left and right center of the connecting portion in plan view. As described above, the flange portion is coupled to the coupling portion.

(Operation and effect of the invention)
[I] -1
In a walking type rice transplanter, when the planting arms are arranged side by side in the left and right direction at the rear of the aircraft so as to be between the small planting strips, the planting strip next to the right wheel approaches the trace of the right wheel Then, the planting strip on the left side of the left wheel approaches the trace of the left wheel.
As a result, the passing trace of the right (left) wheel is moved to the support case side (airframe center side), and the passing trace of the right wheel is transferred from the planting strip adjacent to the right wheel to the right support case side ( It is necessary to separate the left wheel from the planting strip on the left side of the left wheel to the left support case side (machine center side).

In order to configure as described above, the first feature of the present invention is that the end portion of the wheel lug portion on the support case side is positioned on the support case side of the wheel axle portion in plan view. Yes.
As a result, from the planting strip on the right side of the right wheel, the trace of the right wheel (the trace of the rim and lug) can be separated to the right support case side (the center of the fuselage). From the planting strip adjacent to the left side of the wheel, the passage mark (rim part and lug part) of the left wheel can be separated to the left support case side (airframe center side).

[I] -2
When configured as described in [I] -1, the right (left) wheel lug approaches the right (left) support case, so the right (left) wheel lug is There is a possibility of contacting the (left) support case.

On the other hand, in the first feature of the present invention, the pipe portion of the support case is configured as a square pipe with a quadrangular cross section, and the side surface on the wheel side of the pipe portion of the support case is configured along the vertical direction. Yes.
Further, in the flange portion of the pipe portion of the support case and the connection portion of the front case of the support case, the left and right center of the pipe portion of the support case in a plan view with respect to the left and right center of the connection portion of the front case of the support case The flange part of the pipe part of the support case is connected to the connection part of the front case of the support case so that is located on the center side of the machine body.
As a result, the wheel side surface of the pipe portion of the support case does not swell toward the wheel side and is separated from the wheel toward the center of the fuselage, so the right (left) wheel lug portion is supported on the right (left) side. Avoiding contact with the case.

[I] -3
As described above, according to the first feature of the present invention, even if the planting arm is arranged in the left-right direction at the rear part of the aircraft so as to be a small planting line, the right (left) wheel lug portion is While properly avoiding contact with the right (left) support case, from the planting strip on the right (left) next to the right (left) wheel, By separating the lag passage) to the right (left) support case side (machine center side), it was possible to obtain a walk-type rice transplanter with less possibility of seedling falling after planting.

[II]
(Constitution)
The second feature of the present invention is that the walking type rice transplanter of the first feature of the present invention is configured as follows.
In plan view, the length from the left and right center of the pipe portion to the end of the flange portion on the wheel side is longer than the length from the left and right center of the pipe portion to the end of the flange portion on the center side of the fuselage. It has become.

(Operation and effect of the invention)
According to the second feature of the present invention, in the flange portion of the pipe portion of the support case, the length from the left and right center of the pipe portion to the wheel side end of the flange portion in plan view is from the left and right center of the pipe portion to the flange portion. The flange portion of the pipe portion of the support case is configured to be asymmetrical so as to be longer than the length to the end portion on the machine body center side.

  Thus, by connecting the flange portion of the pipe portion of the support case to the connection portion of the front case of the support case, the connection portion of the front case of the support case in plan view as described in [I] -2 above. The state where the left and right center of the pipe part of the support case is located on the center side of the machine body can be obtained without difficulty.

[III]
(Constitution)
The third feature of the present invention is that the walking type rice transplanter is configured as follows.
A mission case is provided at the front of the aircraft,
The right and left support cases are provided on the right and left sides of the transmission case, and are supported by right and left support cases that are supported so as to be swingable up and down around a horizontal axis in the left-right direction and extend rearward. The right wheel for traveling is rotatably supported on the right part of the rear part of the case, and the left wheel for traveling is rotatably supported on the left part of the rear part of the left support case,
A front case that is swingably supported by the transmission case, a pipe portion that is connected to the front case and extends rearward, and a rear portion of the pipe portion. And a rear case that rotatably supports the right and left rear wheels,
An axle part rotatably supported by the rear case on the right and left wheels, a spoke part connected to the axle part and extending radially outward of the wheel, and an outer end of the spoke part A ring-shaped rim portion connected to the rim portion, and a lug portion that is wider than the rim portion and connected to the rim portion, and the end portion on the support case side of the lug portion in plan view, It is located on the support case side from the axle part,
The pipe part is configured as a rectangular pipe having a rectangular cross-section with a narrower left-right width than the vertical width, and the pipe part is disposed so that the side surface on the wheel side of the pipe part is along the vertical direction. ing.

(Operation and effect of the invention)
[III] -1
In a walking type rice transplanter, when the planting arms are arranged side by side in the left and right direction at the rear of the aircraft so as to be between the small planting strips, the planting strip next to the right wheel approaches the trace of the right wheel Then, the planting strip on the left side of the left wheel approaches the trace of the left wheel.
As a result, the passing trace of the right (left) wheel is moved to the support case side (airframe center side), and the passing trace of the right wheel is transferred from the planting strip adjacent to the right wheel to the right support case side ( It is necessary to separate the left wheel from the planting strip on the left side of the left wheel to the left support case side (machine center side).

In order to configure as described above, the third feature of the present invention is that the end of the lug portion of the wheel on the support case side is located on the support case side of the wheel axle portion in plan view. Yes.
As a result, from the planting strip on the right side of the right wheel, the trace of the right wheel (the trace of the rim and lug) can be separated to the right support case side (the center of the fuselage). From the planting strip adjacent to the left side of the wheel, the passage mark (rim part and lug part) of the left wheel can be separated to the left support case side (airframe center side).

[III] -2
When configured as described in [III] -1 above, the right (left) wheel lug approaches the right (left) support case, so the right (left) wheel lug is There is a possibility of contacting the (left) support case.

On the other hand, in the third feature of the present invention, the pipe portion of the support case is configured as a rectangular pipe with a rectangular cross section having a narrower left-right width than the vertical width, and the wheel side of the pipe portion of the support case The side surface is configured to be along the vertical direction.
As a result, the wheel side surface of the pipe portion of the support case does not swell toward the wheel side and is separated from the wheel toward the center of the fuselage, so the right (left) wheel lug portion is supported on the right (left) side. Avoiding contact with the case.
Further, according to the third feature of the present invention, the support case (pipe part) is formed in a vertical direction by forming the pipe part of the support case into a rectangular pipe having a rectangular cross-section with a narrower left-right width than the vertical width. It has high strength against bending.

[III] -3
As described above, according to the third feature of the present invention, even if the planting arms are arranged side by side in the left-right direction at the rear of the aircraft so as to be between small planting strips, the right (left) wheel lug is While properly avoiding contact with the right (left) support case, from the planting strip on the right (left) next to the right (left) wheel, By separating the lag passage) to the right (left) support case side (machine center side), it was possible to obtain a walk-type rice transplanter with less possibility of seedling falling after planting.

[IV]
(Constitution)
The fourth feature of the present invention resides in the following configuration in any one of the walking type rice transplanters of the first to third features of the present invention.
A transmission shaft for transmitting power to the wheels is provided in the pipe portion.

(Operation and effect of the invention)
When power is transmitted to the right (left) wheel, according to the fourth feature of the present invention, the power transmission shaft for transmitting power to the wheel is provided inside the pipe portion so that the power transmission shaft is protected from muddy water by the pipe portion. In this state, power is transmitted to the wheels without difficulty.

[V]
(Constitution)
The fifth feature of the present invention resides in the following configuration in any one of the walking type rice transplanters of the first to fourth features of the present invention.
The end of the lug portion on the support case side in the plan view is configured so that the spoke portion extends in an oblique direction from the axle portion toward the outer side in the radial direction of the wheel and toward the support case side. Rather than the support case.

(Operation and effect of the invention)
As described in [I] -1 and [III] -1, the end of the wheel lug portion on the support case side is positioned on the support case side of the wheel axle portion in plan view. In this case, according to the fifth aspect of the present invention, the spoke portion of the wheel extends from the axle portion in an oblique direction toward the outer side in the radial direction of the wheel and toward the support case.
As a result, from the planting strip on the right side of the right wheel, the right wheel passage mark (the rim part and the lug part passage mark) can be easily released to the right support case side (aircraft center side). From the planting strip on the left side of the left wheel, the left wheel passage mark (rim part and lug part) can be easily separated to the left support case side (airframe center side).

[VI]
(Constitution)
The sixth feature of the present invention resides in the following configuration in any one of the walking type rice transplanters of the first to fifth features of the present invention.
In front view, the front case and the passage locus of the lug overlap,
In the side view, the front case and the passage locus of the lug portion do not overlap.

(Operation and effect of the invention)
According to the sixth feature of the present invention, the front case of the support case and the passage locus of the wheel lug portion overlap in front view, and the front case of the support case and the passage locus of the wheel lug portion appear in side view. As described in the preceding paragraphs [I] -1 and [III] -1, the plane view is obtained by making the state not overlapping (a state in which the passage locus of the wheel lug portion is located behind the front case of the support case). Thus, a state where the end portion of the wheel lug portion on the support case side is positioned on the support case side with respect to the wheel axle portion can be obtained without difficulty.

[VII]
(Constitution)
A seventh feature of the present invention resides in the following configuration in the walking type rice transplanter of the sixth feature of the present invention.
In the right and left support cases, the pipe portion is provided with a mounting portion,
A spring member that suppresses the difference in height between the right and left support cases is connected across the attachment portion of the right support case and the attachment portion of the left support case,
In the side view, the attachment portion and the passage locus of the lug portion overlap.

(Operation and effect of the invention)
In the walking type rice transplanter, a spring member may be connected across the right and left support cases, and the height difference between the right and left support cases may be suppressed by the spring member.

According to the seventh aspect of the present invention, the pipe portion of the support case is provided with an attachment portion, and the spring member is connected to the attachment portion of the support case, and the attachment portion of the support case and the wheel lug portion pass through in a side view. The track overlaps.
Thereby, the lug part of the wheel is separated from the front case of the support case to the rear side, and a relatively large space is obtained on the front side of the wheel (near the front case of the support case), so the vicinity of the spring member from the front side of the wheel Maintenance work can be easily performed.

[VIII]
(Constitution)
The eighth feature of the present invention is that the walking type rice transplanter of the seventh feature of the present invention is configured as follows.
In the right and left support cases, a reinforcing member is connected across the airframe center side portion of the front case and the attachment portion.

(Operation and effect of the invention)
In the right and left support cases, the pipe portion is cantilevered from the front case of the support case so as to extend to the rear side. Therefore, as in the eighth feature of the present invention, the center of the body of the front case of the support case By connecting the reinforcing member over the side portion and the attachment portion of the pipe portion of the support case, the connection portion between the front case of the support case and the pipe portion can be reinforced.

  In this case, according to the eighth aspect of the present invention, the reinforcing member is connected to the pipe portion of the support case by using the attachment portion (see [VII] in the previous section) of the support case (pipe portion) for connecting the spring member. Therefore, it is not necessary to provide a dedicated mounting portion for connecting the reinforcing member to the pipe portion of the support case, which is advantageous in terms of simplification of the structure.

[IX]
(Constitution)
The ninth feature of the present invention resides in the following configuration in the walking type rice transplanter of the eighth feature of the present invention.
In the right and left support cases, the arm portion is sandwiched between the body central side portion of the front case and the reinforcing member, and the arm portion is extended upward from the front case. Then, the reinforcing member and the arm portion are connected to the front case,
A longitudinal operating force is applied to the arm portion so that the support case is swung up and down.

(Operation and effect of the invention)
In the walking type rice transplanter, the arm part is connected upward to the front case part of the support case, and the support case is swung up and down by applying an operating force in the front-rear direction to the arm part by a hydraulic cylinder or the like. May be configured to perform attitude control.

  According to the ninth feature of the present invention, when the arm portion is connected to the front case of the support case, the arm portion is sandwiched between the body central side portion of the front case of the support case and the reinforcing member, and the arm The reinforcing member and the arm portion are coupled to the front case of the support case in a state of extending upward from the front case of the portion support case. Thereby, an arm part can be connected with sufficient intensity | strength to the front case of a support case.

[X]
(Constitution)
The tenth feature of the present invention resides in the following configuration in the walking type rice transplanter of the ninth feature of the present invention.
The reinforcing member and the arm portion are bolted to the front case at a front side portion and a rear side portion of the horizontal axis core in the central body side portion of the front case.

(Operation and effect of the invention)
When the reinforcing member and the arm portion are connected to the front case of the support case as described in [IX] above, according to the tenth feature of the present invention, a load applied from the reinforcing member and the arm portion to the front case of the support case is increased. Thus, the load is applied to the front part and the rear part of the front case of the support case, so that the load on the front case of the support case can be reduced.

[XI]
(Constitution)
The eleventh feature of the present invention lies in the following configuration in the walking type rice transplanter of the tenth feature of the present invention.
In the front side portion of the front axis of the machine body side of the front case, the reinforcing member and the arm portion are bolted to the front case with a single bolt,
The reinforcing member and the arm portion are bolted to the front case with two bolts at the rear side portion of the horizontal axis core in the central part of the front case.

(Operation and effect of the invention)
As described in [X] above, in the state where the load applied to the front case of the support case from the reinforcing member and the arm portion is distributed and applied to the front and rear portions of the front case of the support case, The load applied from the pipe part to the front case of the support case is more applied to the rear part of the front case of the support case than the front part of the support case (the rear part of the support case is connected to the pipe of the support case). Due to the closeness to the part).
In this case, according to the eleventh feature of the present invention, the load applied from the reinforcing member (the pipe portion of the support case) to the rear portion of the front case of the support case is supported with sufficient strength by the two bolts.

[XII]
(Constitution)
The twelfth feature of the present invention resides in the following configuration in any one of the walking type rice transplanters of the ninth to eleventh features of the present invention.
The arm part is provided with an extension part extending rearward, and the extension part is connected to the attachment part.

(Operation and effect of the invention)
According to the twelfth feature of the present invention, in addition to the arm portion being connected to the front case of the support case (see [IX] above), the arm portion is also connected to the pipe portion of the support case. Load is distributed and applied to the front case and the pipe portion of the support case, and the load on the front case of the support case can be reduced.

  In this case, according to the twelfth feature of the present invention, the extension portion of the arm portion is connected to the support case by using the attachment portion (see [VII] in the previous section) of the support case (pipe portion) for connecting the spring member. Since it is connected to the pipe part, it is not necessary to provide a dedicated mounting part for connecting the extension part of the arm part to the pipe part of the support case, which is advantageous in terms of simplification of the structure.

[XIII]
(Constitution)
The thirteenth feature of the present invention resides in the following configuration in any one of the walking rice transplanters of the ninth to twelfth features of the present invention.
An operation force in the front-rear direction is applied to the arm portion via a suspension mechanism, and the support case is configured to swing up and down.
The suspension mechanism is provided with a plurality of disc springs arranged in a line with their directions reversed.

(Operation and effect of the invention)
As described in [IX] above, the arm part is connected upward to the front case part of the support case, and the support case is swung up and down by applying an operating force in the front-rear direction to the arm part by a hydraulic cylinder or the like. When configured as described above, there may be a configuration in which an operating force in the front-rear direction is applied to the arm portion via the suspension mechanism.
In this case, according to the thirteenth feature of the present invention, the suspension mechanism is provided with a plurality of disc springs arranged in a row in opposite directions, and the suspension function is exhibited by the plurality of disc springs. Therefore, the suspension mechanism can be configured simply.

It is a left view of a walking type rice transplanter. It is a top view of a walk type rice transplanter. It is a top view of a right support case and a wheel. It is a transverse plan view of the right support case and wheels. It is sectional drawing seen from the VV direction in FIG. It is sectional drawing seen from the VI-VI direction in FIG. It is a top view of the pipe part of the right support case. It is sectional drawing seen from the VIII-VIII direction in FIG. It is sectional drawing seen from the IX-IX direction in FIG. It is a disassembled perspective view of a right support case (a front case and a pipe part), an arm part, and a reinforcement member. It is a vertical left side view of a linkage member in the left support case. It is sectional drawing of the 1st another form of implementation of the invention seen from the VV direction in FIG.

  1-4, F indicates the “forward direction” of the aircraft, B indicates the “rear direction” of the aircraft, U indicates the “upward direction” of the aircraft, and D indicates the “downward direction” of the aircraft. ing. In the state of facing the front of the aircraft, R indicates the “right direction” of the aircraft and L indicates the “left direction” of the aircraft.

[1]
The overall configuration of the walking type rice transplanter will be described.
As shown in FIGS. 1 and 2, a mission case 1 is provided at the left and right center of the front portion of the aircraft, and an engine 3 is supported on a support frame 2 connected to the front portion of the mission case 1. A pipe-like support frame 4 is connected to the rear part of the mission case 1 and extended to the rear side. A seedling planting device 5 and a steering handle 6 are connected to the rear part of the support frame 4. A mounting table 15 is supported.

As shown in FIGS. 1 and 2, a right (left) support case 7 is swingably supported up and down around a horizontal axis P <b> 1 in the left-right direction of the right part (left part) of the mission case 1. It extends to the rear side. The right wheel 8 for traveling is rotatably supported on the right part of the rear case 37 at the rear part of the right support case 7, and the left part for traveling on the left part of the rear case 37 at the rear part of the left support case 7. The wheel 8 is rotatably supported.
The center float 9 is supported along the front-rear direction at the left and right center of the lower part of the fuselage, the right side float 10 is supported along the front-rear direction at the lower right part of the fuselage, and the left is located at the lower left part of the aircraft. Side float 10 is supported along the front-rear direction.

  As shown in FIGS. 1 and 2, the seedling planting device 5 includes a feed case 11 disposed above the center float 9 at the center of the left and right sides of the machine body, and a center planting case ( (Not shown), right (left) planting case 12 disposed above right (left) side float 10, and right and left portions at the bottom of a central planting case (not shown). The planting arm 13, the planting arm 13 provided on the lower left part (right part) of the right (left) planting case 12, the seedling bed 14, etc. are configured in a four-row planting type. .

  With the above structure, as shown in FIGS. 1 and 2, the power of the engine 3 is transmitted to the transmission case 1 via a transmission belt (not shown), and the power from the transmission case 1 is on the right (left). Is transmitted to the right (left) wheel 8 via a transmission shaft 16 (see FIG. 4) inside the support case 7. Power from the transmission case 1 is transmitted to the seedling planting device 5 via a transmission shaft (not shown) inside the support frame 4.

[2]
Next, the overall structure of the right and left support cases 7 will be described.
In this section [2] and later-described [3] to [9], FIGS. 3 to 10 show the right support case 7 and the right wheel 8. In this case, the left support case 7 and the left wheel 8 have the same structure as that shown in FIGS. 3 to 10 except that the left support case 7 and the left wheel 8 are symmetrical to the right support case 7 and the right wheel 8. It has become.

  As shown in FIGS. 2, 3, and 4, the support case 7 includes a front case 35 made of a casting, a pipe portion 36 made of a square pipe, and a rear case 37 made of a casting. A flange portion 36 a is connected to the front portion of the pipe portion 36 by welding, and the flange portion 36 a of the pipe portion 36 is connected to the front case 35 by four bolts 38. A flange portion 36 b is connected to the rear portion of the pipe portion 36 by welding, and the flange portion 36 b of the pipe portion 36 is connected to the rear case 37 by three bolts 39.

  As shown in FIGS. 2, 3, and 4, the right (left) boss 1 a extends from the right (left) lateral wall of the mission case 1, and the right (left) support case 7 (front case 35). ) Is supported on the right (left) boss 1a (around the horizontal axis P1 of the mission case 1) so as to be swingable up and down, and the right (left) support case 7 extends rearward. Has been issued.

  As shown in FIG. 4, the transmission shaft 16 is rotatably supported inside the pipe portion 36 by the bearings 17 of the front case 35 and the rear case 37. The transmission shaft 18 of the transmission case 1 is inserted into the front case 35 from the inside of the boss portion 1a of the transmission case 1 and supported by the bearing 19 inside the front case 35, and the bevel gear 18a of the transmission shaft 18 and The bevel gear 16a of the transmission shaft 16 is engaged. The axle 20 is rotatably supported by the bearing 21 on the rear case 37, and the bevel gear 16b of the transmission shaft 16 and the bevel gear 20a of the axle 20 are engaged with each other.

  As a result, as shown in FIG. 4, the power of the engine 3 is transmitted to the transmission case 1 via a transmission belt (not shown), and the power from the transmission case 1 is transmitted from the transmission shaft 18 to the bevel gear of the transmission shaft 18. 18a and the bevel gear 16a of the transmission shaft 16 are transmitted to the transmission shaft 16, and the bevel gear 16b of the transmission shaft 16 and the bevel gear 20a of the axle 20 are transmitted to the axle 20 to rotate the axle 20 (wheel 8). Is done.

[3]
Next, the front case 35, the pipe portion 36, and the rear case 37 in the right and left support cases 7 will be described.
As shown in FIGS. 4, 5, 6, and 10, a planar connection portion 35 a is provided at the rear portion of the front case 35, and a boss portion 35 b is provided at the left portion (right portion) of the front case 35. The boss portion 35 b of the front case 35 is fitted into the boss portion 1 a of the mission case 1.

  As shown in FIGS. 4, 5, 6, and 10, the boss portion 35 b of the front case 35 is provided with a flange portion 35 c (corresponding to the center side of the machine body) over the entire circumference of the boss portion 35 b of the front case 35. One boss portion 35d is provided at the front portion of the flange portion 35c of the front case 35, and two boss portions 35e are provided at the rear portion of the flange portion 35c of the front case 35.

  As shown in FIGS. 8 and 9, the pipe portion 36 is configured as a rectangular pipe having a rectangular cross-section with a lateral width W12 narrower than the vertical width W11, and the side surface of the pipe portion 36 on the wheel 8 side. The pipe part 36 is arrange | positioned so that 36c may follow an up-down direction. The flange portion 36a of the pipe portion 36 is formed in a rectangular shape when viewed from the front, and four bolt holes 36d and 36e are opened.

As shown in FIGS. 7 and 8, the length L11 from the left and right center CL1 of the pipe portion 36 to the end portion on the wheel 8 side of the flange portion 36a of the pipe portion 36 in plan view and front view is as follows. It is longer than the length L12 from the left-right center CL1 to the end of the flange portion 36a of the pipe portion 36 on the machine body center side.
Thereby, in plan view and front view, the length from the left and right center CL1 of the pipe part 36 to the bolt hole 36d of the pipe part 36 is longer than the length from the left and right center CL1 of the pipe part 36 to the bolt hole 36e of the pipe part 36. Is also getting longer.

  As shown in FIG. 4, in the flange portion 36a of the pipe portion 36 and the connecting portion 35a of the front case 35, the left and right center of the pipe portion 36 is compared with the left and right center CL2 of the connecting portion 35a of the front case 35 in plan view. The flange portion 36a of the pipe portion 36 is connected to the connecting portion 35a of the front case 35 by four bolts 38 (bolt holes 36d, 36e) so that CL1 is located on the center side of the machine body (opposite the wheel 8). ing.

As shown in FIG. 9, the flange portion 36b of the pipe portion 36 is formed in a triangular shape when viewed from the front, and three bolt holes 36f and 36g are opened.
As shown in FIG. 4, in the flange portion 36 b of the pipe portion 36 and the rear case 37, the portion of the flange portion 36 b of the pipe portion 36 on the machine body center side (opposite side of the wheel 8) is a single piece in a plan view. A bolt 39 (bolt hole 36f) is connected to the rear case 37, and a portion of the flange portion 36b of the pipe portion 36 on the wheel 8 side is connected to the rear case 37 by two bolts 39 (bolt hole 36g). Yes.

[4]
Next, the spring member 30 connected across the right and left support cases 7 will be described.
As shown in FIGS. 3, 4, 5, and 10, in the right and left support cases 7, the attachment portion 25 is connected to the side surface of the pipe portion 36 on the machine body central side (opposite side of the wheel 8) by welding. The mounting portion 25 is configured by bending a plate material. As shown in FIGS. 2, 3, and 10, the right end portion of the spring member 30 is bolt-connected to the upper surface 25 a of the attachment portion 25 of the right support case 7 (pipe portion 36). Is connected to the upper surface 25a of the mounting portion 25 of the left support arm 7 (pipe portion 36) by bolts.

As shown in FIGS. 2 and 3, the spring member 30 is a flat plate spring, the upper flat portion of the spring member 30 faces upward, and the lower flat portion of the spring member 30 faces downward. Yes.
When a difference in height is about to occur between the right and left support cases 7, the height difference between the right and left support cases 7 suddenly occurs, or the right and left support cases 7. A state in which a large difference in height is generated is suppressed by the spring member 30, and a state in which an appropriate difference in height is gently generated between the right and left support cases 7 is obtained.

[5]
Next, the connection relationship between the front case 35 and the pipe portion 36 in the right and left support cases 7 will be described.
As described in [8] to be described later, in a structure in which the right and left support cases 7 are operated to swing, as shown in FIGS. Arm portion 26 is provided.

  As shown in FIG. 10, the arm portion 26 is configured by bending a plate material, and includes a pair of vertical wall portions 26a and 26b, a middle wall portion 26c that connects the vertical wall portions 26a and 26b, and one vertical wall portion 26a. An extending part 26d extending downward, a pipe part 26e connected to the vertical wall parts 26a and 26b, and nuts 26f and 26g connected to the vertical wall part 26b are provided.

  As shown in FIG. 10, a reinforcing member 22 is provided. The reinforcing member 22 is made of a plate material, and includes a large opening 22a and four bolt holes 22b, 22c, and 22d. In this case, the boss 1 a of the mission case 1 is inserted in advance into the opening 22 a of the reinforcing member 22.

  As shown in FIGS. 5, 6, and 10, with the vertical wall portion 26 a of the arm portion 26 facing the center of the machine body and the vertical wall portion 26 b of the arm portion 26 facing the front case 35, The arm portion 26 is attached to the flange portion 35c of the front case 35 from above so that the flange portion 35c of the front case 35 enters between the wall portions 26a and 26b.

5, 6, and 10, the nut 26 f of the arm portion 26 faces the boss portion 35 d of the front case 35, and the nut 26 g and the extension portion 26 d of the arm portion 26 are of the front case 35. It will be in the state which opposes the boss | hub part 35e.
The reinforcing member 22 is applied to the arm portion 26 (the vertical wall portion 26 a and the extending portion 26 d), and the reinforcing member 22 is applied to the side surface 25 b of the mounting portion 25.

  As shown in FIGS. 5, 6, and 10, in the front portion of the horizontal axis P <b> 1 (the boss portion 1 a of the transmission case 1) in the flange portion 35 c of the front case 35, the bolts 27 are bolt holes 22 b of the reinforcing member 22, It passes through the bolt hole of the vertical wall portion 26a of the arm portion 26 and the boss portion 35d of the front case 35 and is inserted into the nut 26f of the arm portion 26 (vertical wall portion 26b) and tightened.

  As shown in FIGS. 5, 6, and 10, the bolt 28 is a bolt of the reinforcing member 22 in the upper portion of the flange 35 c of the front case 35 on the rear side of the horizontal axis P <b> 1 (the boss 1 a of the transmission case 1). The hole 22c, the bolt hole in the vertical wall portion 26a of the arm portion 26, and the boss portion 35e on the upper side of the front case 35 are inserted into the nut 26g of the arm portion 26 (vertical wall portion 26b) and tightened.

As shown in FIGS. 5, 6, and 10, the bolt 31 is attached to the reinforcing member 22 at a lower part of the rear side of the horizontal axis P <b> 1 (the boss portion 1 a of the transmission case 1) in the flange portion 35 c of the front case 35. The bolt hole 22c, the bolt hole of the extending portion 26d of the arm portion 26, and the boss portion 35e on the lower side of the front case 35 are passed through and tightened by the nut 33.
The bolt 32 is inserted into the bolt hole 22 d of the reinforcing member 22, and the reinforcing member 22 is connected to the side surface 25 b of the mounting portion 25 by the bolt 32.

[6]
Due to the structure described in the preceding item [5], the state is as follows.
As shown in FIGS. 3, 5, and 10, in the right and left support cases 7, the reinforcing member 22 extends across the flange portion 35 c (the machine body center side portion) of the front case 35 and the attachment portion 25 of the pipe portion 36. It is in a connected state.

  As shown in FIGS. 5, 6, and 10, in the right and left support cases 7, the arm portion 26 (vertical wall portion 26 a and extension portion 26 d) is reinforced with the flange portion 35 c (machine body center side portion) of the front case 35. The reinforcing member 22 and the arm portion 26 are connected to the front case 35 in a state of being sandwiched between the member 22 and the arm portion 26 extending upward from the front case 35. .

  As shown in FIGS. 5, 6, and 10, reinforcement is provided at the front side portion and the rear side portion of the horizontal axis P <b> 1 (the boss portion 1 a of the transmission case 1) in the flange portion 35 c (machine body side portion) of the front case 35. The member 22 and the arm part 26 are connected to the front case 35 by bolts.

As shown in FIGS. 5, 6, and 10, the reinforcing member 22 and the arm portion are provided at the front side portion of the horizontal axis P <b> 1 (the boss portion 1 a of the transmission case 1) in the flange portion 35 c (machine body side portion) of the front case 35. 26 is connected to the front case 35 with a single bolt 27.
In the rear portion of the horizontal axis P1 (the boss portion 1a of the transmission case 1) in the flange portion 35c (the body center side portion) of the front case 35, the reinforcing member 22 and the arm portion 26 are provided on the front case 35. The bolts 28 and 31 are bolted.

[7]
Next, the relationship between the left (right) support case 7 and the left (right) wheel 8 will be described.
As shown in FIGS. 3 and 4, the wheel 8 includes a boss-shaped axle portion 8 a connected to the axle 20, and is connected to the axle portion 8 a so as to be radially outward from the axle 8 a and on the support case 7 side. A plurality of spoke portions 8b extending in an oblique direction facing each other, a ring-shaped rim portion 8c connected to an outer end portion of the spoke portion 8b, and protruding to the right and left from the rim portion 8c are wider than the rim portion 8c. A lug portion 8d connected to the rim portion 8c is provided.
As a result, as shown in FIGS. 3 and 4, the end portion 8 e on the support case 7 side of the lug portion 8 d of the wheel 8 is positioned closer to the support case 7 than the axle portion 8 a of the wheel 8 in plan view. Yes.

  As shown in FIGS. 3 and 4, the spoke portion 8b of the right (left) wheel 8 extends in an oblique direction toward the right (left) support case 7 side, whereby the right (left) wheel. The eight lug portions 8d approach the right (left) support case 7.

In this case, as shown in FIG. 3, the front case 35 and the passage locus of the lug portion 8d of the wheel 8 overlap in the range W13 when viewed from the front (when viewed from B to F).
In the side view (when viewed from R to L (L to R)), the attachment portion 25 of the support case 7 (pipe portion 36) and the passage locus of the lug portion 8d of the wheel 8 overlap the range W14. In the side view, the front case 35 and the passage trajectory of the lug 8d of the wheel 8 do not overlap (the state where the lug 8d of the wheel 8 is located on the rear side of the front case 35).

In the above state, as shown in FIG. 3 and FIG.
“In the flange portion 36a of the pipe portion 36 and the connecting portion 35a of the front case 35, the left and right center CL1 of the pipe portion 36 is the center side of the vehicle body (wheel side) with respect to the left and right center CL2 of the connecting portion 35a of the front case 35 in plan view. The flange portion 36a of the pipe portion 36 is connected to the connecting portion 35a of the front case 35 by the four bolts 38 (bolt holes 36d and 36e) so that the flange portion 36a is located on the opposite side of FIG. ]reference).
And
“The pipe portion 36 is configured as a rectangular pipe having a rectangular cross-section with a lateral width W12 narrower than the vertical width W11, and the side surface 36c on the wheel 8 side of the pipe portion 36 is along the vertical direction. The point where the pipe part 36 is arrange | positioned "(refer previous paragraph [3])
Is obtained.

  As a result, as shown in FIGS. 3 and 4, the right (left) support case 7 (pipe portion 36) is separated from the trajectory of the lug portion 8d of the right (left) wheel 8 toward the center of the body. The trajectory of the lug portion 8d of the right (left) wheel 8 is separated from the right (left) support case 7 (pipe portion 36) with a gap W15 therebetween.

[8]
Next, the structure of the swing operation of the right and left support cases 7 will be described.
As shown in FIGS. 1 and 2, a hydraulic cylinder 23 is supported rearward inside the support frame 2, and a linking member 24 is arranged around the vertical axis P <b> 2 in the vertical direction at the tip of the piston 23 a of the hydraulic cylinder 23. Is swingably supported.

As shown in FIGS. 1 and 2, a linkage member 29 is connected across the right end portion of the linkage member 24 and the right arm portion 26 (pipe portion 26e), and the left end portion of the linkage member 24 and A linkage member 29 is connected across the left arm portion 26 (pipe portion 26e).
Thus, when the hydraulic cylinder 23 is extended, the linkage member 24 is moved rearward, and the right and left support cases 7 are swung downward. When the hydraulic cylinder 23 is contracted, the linkage member 24 moves forward, and the right and left support cases 7 are swung upward.

As shown in FIG. 2, the linkage member 24 is supported so as to be swingable around the longitudinal axis P <b> 2 of the piston 23 a of the hydraulic cylinder 23.
As a result, when the airframe is about to tilt in the left-right direction due to the unevenness of the cultivator (the hard part located below the paddy surface) where the right and left wheels 8 touch the ground, the center float 9 and the side float 10 are tilted. For example, the right wheel 8 is raised and the left wheel 8 is lowered so that the height between the right and left support cases 7 is increased. Difference occurs, and the inclination of the fuselage is suppressed.

  In this case, as described in [4] above, there is a sudden difference in height between the right and left support cases 7, or a large difference in height between the right and left support cases 7. The state in which the occurrence of this is suppressed by the spring member 30, and a state in which an appropriate height difference is gently generated between the right and left support cases 7 is obtained.

[9]
Next, the suspension mechanism in the linking member 29 will be described.
As shown in FIG. 11, the linking member 29 is formed of a channel material, and a receiving portion 29 a is connected to an intermediate portion of the linking member 29, and a rear portion of the linking member 29 is connected to a pipe portion 26 e of the arm portion 26. 34 is connected.

  As shown in FIG. 11, a long hole 29 b extending in the front-rear direction is opened at the front portion of the linkage member 29, and the connection pin 40 is linked to the right (left) end portion of the linkage member 24. 40 is inserted into the long hole 29 b of the linkage member 29. The linkage rod 41 is arranged inside the linkage member 29, and a bracket 41 a connected to the front portion of the linkage rod 41 is attached to the connection pin 40.

  As shown in FIG. 11, the rear portion of the linkage rod 41 is slidably inserted in the receiving portion 29 a of the linkage member 29 in the front-rear direction, and a retaining nut 42 and a washer 43 are attached to the rear portion of the linkage rod 41. Yes. A plurality of disc springs 44 are externally fitted to the linkage rods 41 between the receiving portions 29a of the linkage members 29 and the brackets 41a of the linkage rods 41, and the disc springs 44 are arranged in a row with their directions being opposite to each other. Are lined up.

The state shown in FIG. 11 is a state in which the washer 43 is in contact with the receiving portion 29a of the linkage member 29 and the suspension mechanism is most extended. From this state, when the disc spring 44 is compressed by the receiving portion 29a of the linkage member 29 and the bracket 41a of the linkage rod 41, the disc spring 44 resists, whereby the linkage rod 41 and the disc spring 44 are suspended. Function as.
As a result, as described in [8] above, when the right and left support cases 7 are swung up and down by the expansion and contraction of the hydraulic cylinder 23, the right and left supports are supported via the suspension mechanism described above. The case 7 is swung up and down.

[10]
Next, the positional relationship between the planting strips L1 to L4, the center float 9 and the side float 10 will be described.
As shown in FIG. 2, the planting strips L <b> 1 to L <b> 4 are rows along the traveling direction of the body of seedlings planted on the rice field by the planting arms 13, and correspond to the four planting arms 13. There are four planting strips L1 to L4. In this case, the rear side of the planting arm 13 is the planting strips L1 to L4 after the seedling is planted, and the front side of the planting arm 13 is the planting strip L1 to L4 before the seedling is planted. .

  As shown in FIGS. 1 and 2, the planting arm 13 of the planting strip L <b> 1 is a planting arm 13 supported by the left planting case 12. The planting arms 13 of the planting strips L2 and L3 are planting arms 13 supported by a central planting case (not shown). The planting arm 13 of the planting strip L4 is a planting arm 13 supported by the right planting case 12.

  As shown in FIG. 2, there are three planting strips W1, W2 for the four planting strips L1 to L4. The central planting strip W1 which is the distance between the right and left planting strips L2, L3 at the left and right center of the aircraft is larger than the two planting strips W2 other than the central planting strip W1. The four planting arms 13 are arranged in the left-right direction so that the two planting strips W2 other than the central planting strip W1 are at the same interval.

  As shown in FIG. 2, in the center float 9, the width of the intermediate portion 9 b of the center float 9 is narrower than the width of the front portion 9 a of the center float 9. The width of the rear portion 9c of the center float 9 is narrower than that. The planting arm 13 is located on the right side and the left side of the middle part 9b of the center float 9 (on the right and left side of the rear part 9c of the center float 9).

  As shown in FIG. 2, in the side float 10, the lateral width of the rear portion 10 b of the side float 10 is narrower than the lateral width of the front portion 10 a of the side float 10. An inclined portion 10c extending obliquely is provided on the left portion (right portion) of the front portion 10a of the right (left) side float 10. The planting arm 13 is located on the rear side of the inclined portion 10c of the right (left) side float 10 (left side (right side) of the rear portion 10b of the right (left) side float 10).

  As shown in FIG. 2, in the center float 9, the front portion 9 a and the intermediate portion 9 b of the center float 9 overlap with the planting strips L <b> 2 and L <b> 3 before the seedling is planted in the plan view. The rear portion 9c of the float 9 is separated from the planting strips L2 and L3 after the seedlings are planted toward the center of the body.

  As shown in FIG. 2, in the side float 10, the inclined portion 10c of the side float 10 slightly overlaps with the planting strips L1 and L4 before the seedling is planted in a plan view. The rear part 10b of the side float 10 is separated from the planting strips L1 and L4 after the seedlings are planted to the outside of the machine body in plan view.

[11]
Next, the positional relationship between the planting strips L1 to L6 and the wheel 8 will be described.
As shown in FIG. 2, the distance W3 between the end of the axle 20 (the axle portion 8a of the wheel 8) and the inclined portion 10c of the side float 10 is small in plan view, and the axle 20 in plan view. An imaginary line extending rearward from the end of (the axle portion 8a of the wheel 8) and an imaginary line extending forward from the end of the inclined portion 10c of the side float 10 are located at substantially the same position. .

In the above-described state, as shown in FIGS. 3 and 4, the spoke portion 8 b of the wheel 8 extends from the axle portion 8 a of the wheel 8 in an oblique direction toward the outside of the wheel 8 in the radial direction and toward the support case 7. .
As a result, the rim portion 8c and the lug portion 8d of the right wheel 8 in plan view are located between the planting strips L3 and L4 and are sufficiently separated from the planting strip L4 toward the center of the machine body. Yes. The rim portion 8c and lug portion 8d of the left wheel 8 in plan view are located between the planting strips L1 and L2, and are sufficiently separated from the planting strip L1 toward the center of the machine body.

[First embodiment of the invention]
In the above-mentioned [Mode for Carrying Out the Invention], as shown in FIG. 12, the extending portion 26 d of the arm portion 26 is extended rearward, and the arm portion 26 is extended together with the reinforcing member 22 by the bolt 32. You may comprise so that the protrusion part 26d may be connected with the attachment part 25. FIG.

[Second embodiment of the invention]
In the above-mentioned [Mode for Carrying Out the Invention] and [First Another Mode for Carrying Out the Invention], the pipe portion 36 is not formed into a rectangular pipe having a rectangular cross section, but a square cross section having a square shape. You may comprise in the shape of a square pipe.

  The present invention is not limited to the walking type rice transplanter in which the seedling planting device is configured as a four-row planting type, but also a six-row planting type seedling planting system having six planting arms (between five planting strips). You may apply to the walk type rice transplanter provided with the apparatus.

DESCRIPTION OF SYMBOLS 1 Transmission case 7 Support case 8 Wheel 8a Axle part 8b Spoke part 8c Rim part 8d Lug part 8e End part of lug part on support case side 16 Transmission shaft 22 Reinforcement member 25 Mounting part 26 Arm part 26d Extension part 27 Bolt 28 Bolt 30 Spring member 31 Bolt 35 Front case 35a Connecting portion 35c Machine body central side portion 36 Pipe portion 36a Flange portion 36c Side surface on the wheel side of the pipe portion 37 Rear case 44 Disc spring CL1 Left and right center of the pipe portion CL2 Left and right center of the connecting portion L11 Pipe The length from the left and right center of the flange to the end on the wheel side of the flange portion L12 The length from the left and right center of the pipe portion to the end of the flange portion on the center side of the flange P1 Horizontal axis W11 Vertical width of the pipe portion W12 Pipe portion Left and right width

Claims (13)

A mission case is provided at the front of the aircraft,
The right and left support cases are provided on the right and left sides of the transmission case, and are supported by right and left support cases that are supported so as to be swingable up and down around a horizontal axis in the left-right direction and extend rearward. The right wheel for traveling is rotatably supported on the right part of the rear part of the case, and the left wheel for traveling is rotatably supported on the left part of the rear part of the left support case,
A front case that is swingably supported by the transmission case, a pipe portion that is connected to the front case and extends rearward, and a rear portion of the pipe portion. And a rear case that rotatably supports the right and left rear wheels,
An axle part rotatably supported by the rear case on the right and left wheels, a spoke part connected to the axle part and extending radially outward of the wheel, and an outer end of the spoke part A ring-shaped rim portion connected to the rim portion, and a lug portion that is wider than the rim portion and connected to the rim portion, and the end portion on the support case side of the lug portion in plan view, It is located on the support case side from the axle part,
The pipe part is configured in a square pipe shape having a quadrangular cross section, and the pipe part is arranged so that the side surface on the wheel side of the pipe part is along the vertical direction,
In the flange portion of the pipe portion and the connecting portion of the front case to which the flange portion is connected, the left and right center of the pipe portion is positioned on the machine body center side with respect to the left and right center of the connecting portion in plan view. The walking type rice transplanter in which the flange portion is connected to the connecting portion.   In plan view, the length from the left and right center of the pipe portion to the end of the flange portion on the wheel side is longer than the length from the left and right center of the pipe portion to the end of the flange portion on the center side of the fuselage. The walking type rice transplanter according to claim 1. A mission case is provided at the front of the aircraft,
The right and left support cases are provided on the right and left sides of the transmission case, and are supported by right and left support cases that are supported so as to be swingable up and down around a horizontal axis in the left-right direction and extend rearward. The right wheel for traveling is rotatably supported on the right part of the rear part of the case, and the left wheel for traveling is rotatably supported on the left part of the rear part of the left support case,
A front case that is swingably supported by the transmission case, a pipe portion that is connected to the front case and extends rearward, and a rear portion of the pipe portion. And a rear case that rotatably supports the right and left rear wheels,
An axle part rotatably supported by the rear case on the right and left wheels, a spoke part connected to the axle part and extending radially outward of the wheel, and an outer end of the spoke part A ring-shaped rim portion connected to the rim portion, and a lug portion that is wider than the rim portion and connected to the rim portion, and the end portion on the support case side of the lug portion in plan view, It is located on the support case side from the axle part,
The pipe part is configured as a rectangular pipe having a rectangular cross-section with a narrower left-right width than the vertical width, and the pipe part is disposed so that the side surface on the wheel side of the pipe part is along the vertical direction. Walking rice transplanter.   The walking type rice transplanter according to any one of claims 1 to 3, wherein a transmission shaft for transmitting power to the wheels is provided inside the pipe portion.   The end of the lug portion on the support case side in the plan view is configured so that the spoke portion extends in an oblique direction from the axle portion toward the outer side in the radial direction of the wheel and toward the support case side. The walking type rice transplanter according to any one of claims 1 to 4, which is located closer to the support case. In front view, the front case and the passage locus of the lug overlap,
The walking type rice transplanter according to any one of claims 1 to 5, wherein the front case and the passage locus of the lug portion do not overlap in a side view. In the right and left support cases, the pipe portion is provided with a mounting portion,
A spring member that suppresses the difference in height between the right and left support cases is connected across the attachment portion of the right support case and the attachment portion of the left support case,
The walking type rice transplanter according to claim 6, wherein the attachment portion and the passage locus of the lug portion overlap in a side view.   The walking type rice transplanter according to claim 7, wherein a reinforcing member is connected to the right and left support cases across the machine body center side portion and the attachment portion of the front case. In the right and left support cases, the arm portion is sandwiched between the body central side portion of the front case and the reinforcing member, and the arm portion is extended upward from the front case. Then, the reinforcing member and the arm portion are connected to the front case,
The walking type rice transplanter according to claim 8, wherein an operating force in the front-rear direction is applied to the arm portion so that the support case is swung up and down.   The walking type rice transplant according to claim 9, wherein the reinforcing member and the arm portion are bolted to the front case in a front side portion and a rear side portion of the horizontal axis core in a center side portion of the body of the front case. Machine. In the front side portion of the front axis of the machine body side of the front case, the reinforcing member and the arm portion are bolted to the front case with a single bolt,
The walking according to claim 10, wherein the reinforcing member and the arm portion are bolted to the front case with two bolts in a rear side portion of the horizontal axis core in a center side portion of the front case. Type rice transplanter.   The walking type rice planting according to any one of claims 9 to 11, wherein the arm part is provided with an extension part extending rearward, and the extension part is connected to the attachment part. Machine. An operation force in the front-rear direction is applied to the arm portion via a suspension mechanism, and the support case is configured to swing up and down.
The walking type rice transplanter according to any one of claims 9 to 12, wherein the suspension mechanism is provided with a plurality of disc springs arranged in a row in directions opposite to each other.

Images