CN106717371B

CN106717371B - Walking type rice transplanter

Info

Publication number: CN106717371B
Application number: CN201610391236.1A
Authority: CN
Inventors: 大井幸和; 福岛茂雄; 小林顺子; 清水孝式; 松村哲也
Original assignee: Kubota Corp
Current assignee: Kubota Corp
Priority date: 2015-11-19
Filing date: 2016-06-03
Publication date: 2021-05-18
Anticipated expiration: 2036-06-03
Also published as: CN106717371A; JP2017093323A

Abstract

In the walking type rice transplanter of the present invention, when the transplanting arms are arranged side by side in the left-right direction at the rear of the machine body so as to realize a small transplanting row spacing, the right-side adjacent (left-side adjacent) transplanting row of the right (left) wheel is appropriately deviated from the passing trajectory of the right (left) wheel. When viewed from above, the end (8e) of the lug part (8d) of the wheel (8) on the side of the support box (7) is positioned closer to the support box (7) than the axle part (8a) of the wheel (8). A flange (36a) of a pipe (36) of a support box (7) and a connecting part (35a) of a front box (35) of the support box (7) are positioned on the center side of a machine body relative to the center (CL2) of the connecting part (35a) in the left-right direction when viewed from a plane.

Description

Walking type rice transplanter

Technical Field

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

Background

Patent document 1 discloses the following structure for a walking type rice transplanter.

A transmission case (21 in fig. 1 and 2 of patent document 1) is provided at the front part of the machine body, and a right (left) tubular support case (10 in fig. 1 and 2 of patent document 1) is supported at the right part (left part) of the transmission case so as to be swingable up and down about a horizontal axis in the left-right direction and extends rearward.

A right wheel for traveling is rotatably supported on a right portion of a rear end portion of the right support box (fig. 1 of

patent document

1 and 1 of fig. 2), and a left wheel for traveling is rotatably supported on a left portion of a rear end portion of the left support box (fig. 1 of

patent document

1 and 1 of fig. 2).

In a walking type rice transplanter, a transplanting arm is arranged at the rear of a machine body in the left-right direction and transplants rice seedlings at a position deviated in the left-right direction from the passing trajectory of wheels, and takes out the rice seedlings from a seedling table and transplants the rice seedlings on a farmland.

At this time, the interval between adjacent transplanting rows (the row formed by the seedlings transplanted on the field surface by the transplanting arms in the machine body traveling direction), i.e., the transplanting row spacing, is set to be, for example, 300mm larger.

In recent years, there has been a demand for transplanting seedlings at a small transplanting row pitch of, for example, 250 mm.

Thus, when the transplanting arms are arranged in the left-right direction at the rear part of the machine body so as to achieve a small row pitch, the transplanting arms may transplant seedlings at positions near the passing trajectory of the wheels (the right adjacent transplanting row of the right wheel is close to the passing trajectory of the right wheel, and the left adjacent transplanting row of the left wheel is close to the passing trajectory of the left wheel).

At this time, since the passing track of the wheel is not flat, when the transplanting arms transplant the seedlings at positions near the passing track of the wheel as described above, the transplanted seedlings may fall down.

(Prior art document)

(patent document)

Patent document 1: japanese patent application publication No. 2006-238824 "

Disclosure of Invention

(problems to be solved by the invention)

The present invention has an object to enable a right-side adjacent planting row of a right wheel to be appropriately deviated from a passing trajectory of the right wheel and a left-side adjacent planting row of a left wheel to be appropriately deviated from a passing trajectory of the left wheel in a case where planting arms are arranged in a left-right direction at a rear portion of a machine body so as to realize a small planting row pitch in a walking-type rice planting machine.

(means for solving the problems)

[I] (Structure)

A first feature of the present invention is to configure a walking-type rice transplanter in the following manner.

The front part of the machine body is provided with a transmission case,

a right support box provided in a right portion of the transmission case, a left support box provided in a left portion of the transmission case, the right support box and the left support box being supported to be vertically swingable around a horizontal axis in a left-right direction and extending rearward, a right wheel for traveling being rotatably supported in a right portion of a rear portion of the right support box, and a left wheel for traveling being rotatably supported in a left portion of a rear portion of the left support box,

the right and left support boxes have: a front case supported by the transmission case in a freely swinging manner; a pipe portion connected to the front case and extending rearward; and a rear case coupled to a rear portion of the pipe portion and rotatably supporting the right wheel and the left wheel,

the right wheel and the left wheel have: a spindle portion rotatably supported by the rear case; a spoke portion connected to the axle portion and extending outward in a radial direction of the wheel; an annular rim portion connected to an outer end portion of the spoke portion; and a lug portion that is wider than the rim portion and is connected to the rim portion, an end portion of the lug portion on the support box side being located closer to the support box side than the axle portion in a plan view,

the pipe portion is formed in a square pipe shape having a quadrangular cross section, and is disposed so that a side surface of the pipe portion on the wheel side is along the vertical direction,

the flange portion of the pipe portion and the coupling portion of the front box to which the flange portion is coupled are coupled to the coupling portion such that a center of the pipe portion in a left-right direction is located on a center side of a machine body with respect to a center of the coupling portion in the left-right direction in a plan view.

(action and Effect of the invention) [ I ] -1

In the case of a walking type rice transplanter, when the transplanting arms are arranged in the left-right direction at the rear of the machine body in order to realize a small transplanting row spacing, the right adjacent transplanting row of the right wheel approaches the right wheel passing trajectory, and the left adjacent transplanting row of the left wheel approaches the left wheel passing trajectory.

Thus, the right (left) wheel passing trajectory may be shifted to the support box side (body center side), the right wheel passing trajectory may be shifted from the right adjacent insertion row of the right wheel to the right support box side (body center side), and the left wheel passing trajectory may be shifted from the left adjacent insertion row of the left wheel to the left support box side (body center side).

In order to achieve the above-described structure, a first aspect of the present invention is that an end portion of the lug portion of the wheel on the support case side is located closer to the support case side than the axle portion of the wheel in a plan view.

As a result, the passing trajectory of the right wheel (the passing trajectory of the rim portion and the lug portion) can be shifted from the insertion row adjacent to the right side of the right wheel to the right support box side (the machine body center side), and the passing trajectory of the left wheel (the passing trajectory of the rim portion and the lug portion) can be shifted from the insertion row adjacent to the left side of the left wheel to the left support box side (the machine body center side).

[I]-2

When constructed in the manner described in [ I ] -1 above, the lug part of the right (left) wheel may contact the right (left) support box because the lug part of the right (left) wheel is close to the right (left) support box.

In contrast, according to a first aspect of the present invention, the pipe portion of the support box is formed in a square pipe shape having a rectangular cross section, and the wheel-side surface of the pipe portion of the support box is along the vertical direction.

Further, the flange portion of the pipe portion of the support case is connected to the connection portion of the front case of the support case so that the center in the left-right direction of the pipe portion of the support case is positioned on the center side of the machine body with respect to the center in the left-right direction of the connection portion of the front case of the support case in a plan view.

Thus, the side surface on the wheel side of the tube portion of the support box does not bulge toward the wheel side, but is offset toward the center of the machine body from the wheel, so that the lug portion of the right (left) wheel can be prevented from contacting the right (left) support box.

[I]-3

As described above, according to the first aspect of the present invention, even if the transplanting arms are arranged in the left-right direction at the rear part of the machine body in order to realize a small transplanting row spacing, it is possible to appropriately avoid the state where the lug part of the right (left) wheel contacts the right (left) support box, and to shift the passing trajectory of the right (left) wheel (the passing trajectory of the rim part and the lug part) from the right (left) adjacent transplanting row of the right (left) wheel to the right (left) support box side (the machine body center side), so that it is possible to obtain a walking type rice transplanter in which the possibility of lodging of the seedling after transplanting is small.

[ II ] Structure

A second aspect of the present invention is the walking-type rice transplanter according to the first aspect of the present invention, as described below.

In a plan view, a length from a center of the pipe portion in a lateral direction to an end of the flange portion on the wheel side is longer than a length from the center of the pipe portion in the lateral direction to an end of the flange portion on the body center side.

(action and Effect of the invention)

According to the second aspect of the present invention, the flange portion of the pipe portion of the support box is formed so as to be asymmetric in the left-right direction so that the length from the center of the pipe portion in the left-right direction to the end portion on the wheel side of the flange portion is longer than the length from the center of the pipe portion in the left-right direction to the end portion on the body center side of the flange portion in plan view.

Thus, by connecting the flange portion of the pipe portion of the support box to the connecting portion of the front box of the support box, a state in which the center in the left-right direction of the pipe portion of the support box is positioned on the center side of the machine body with respect to the center in the left-right direction of the connecting portion of the front box of the support box in a plan view as described in [ I ] -2 above can be easily obtained.

[ III ] (Structure)

A third feature of the present invention is to configure the walking-type rice transplanter in the following manner.

The front part of the machine body is provided with a transmission case,

the pipe portion is formed in a rectangular shape having a rectangular cross section with a lateral width smaller than a vertical height, and is disposed so that a side surface of the pipe portion on the wheel side is along a vertical direction.

(action and Effect of the invention) [ III ] -1

In order to achieve the above-described structure, a third aspect of the present invention is that the end portion of the lug portion of the wheel on the support case side is located closer to the support case side than the axle portion of the wheel in a plan view.

[III]-2

When constituted in the manner described in [ III ] -1 above, the lug part of the right (left) wheel may contact the right (left) support box because the lug part of the right (left) wheel is close to the right (left) support box.

In contrast, according to a third aspect of the present invention, the pipe portion of the support box is formed in a rectangular shape having a lateral width smaller than a vertical height and a rectangular cross section having a rectangular shape, and the wheel-side surface of the pipe portion of the support box is along a vertical direction.

Further, according to the third aspect of the present invention, the pipe portion of the support box is formed in a rectangular shape having a rectangular cross section with a lateral width smaller than a vertical height, thereby making it possible to provide the support box (pipe portion) with a large strength against bending in the vertical direction.

[III]-3

As described above, according to the third aspect of the present invention, even if the transplanting arms are arranged in the left-right direction at the rear part of the machine body in order to realize a small transplanting row spacing, it is possible to appropriately avoid the state where the lug part of the right (left) wheel contacts the right (left) support box, and to shift the passing trajectory of the right (left) wheel (the passing trajectory of the rim part and the lug part) from the right (left) adjacent transplanting row of the right (left) wheel to the right (left) support box side (the machine body center side), so that it is possible to obtain a walking type rice transplanter in which the possibility of lodging of the seedling after transplanting is small.

[ IV ] (Structure)

According to a fourth aspect of the present invention, any one of the walking-type rice transplanter according to the first to third aspects of the present invention is configured as follows.

A transmission shaft for transmitting power to the wheel is provided inside the tube portion.

(action and Effect of the invention)

When power is transmitted to the right (left) wheel, according to the fourth aspect of the present invention, the power transmission shaft for transmitting power to the wheel is provided inside the pipe portion, so that power can be smoothly transmitted to the wheel while the power transmission shaft is protected from erosion of muddy water or the like by the pipe portion.

[ V ] (structure)

A fifth aspect of the present invention is the walking-type rice transplanter according to any one of the first to fourth aspects of the present invention configured as follows.

The spoke portion extends from the axle portion in a direction radially outward of the wheel and toward the support case.

(action and Effect of the invention)

According to a fifth aspect of the present invention, the spoke portion of the wheel extends from the axle portion in a direction inclined toward the support box side and radially outward of the wheel. Thus, the state in which the end portion of the lug part of the wheel on the support case side is positioned closer to the support case side than the axle part of the wheel in a plan view as described in [ I ] -1 and [ III ] -1 can be easily obtained.

Thus, the passing trajectory of the right wheel (the passing trajectory of the rim portion and the lug portion) can be easily shifted from the insertion row adjacent to the right side of the right wheel to the right support box side (the machine body center side), and the passing trajectory of the left wheel (the passing trajectory of the rim portion and the lug portion) can be easily separated from the insertion row adjacent to the left side of the left wheel to the left support box side (the machine body center side).

[ VI ] (structure)

A sixth aspect of the present invention is the walking-type rice transplanter according to any one of the first to fifth aspects of the present invention configured as follows.

The passing trajectories of the front case and the lug part overlap when viewed from the front,

the passing trajectories of the front case and the lug part do not overlap when viewed from the side.

(action and Effect of the invention)

According to the sixth aspect of the present invention, the front box of the support box overlaps the locus of passage of the lug part of the wheel when viewed from the front, and the front box of the support box does not overlap the locus of passage of the lug part of the wheel when viewed from the side (the locus of passage of the lug part of the wheel is located on the rear side of the front box of the support box), whereby the state in which the end part on the support box side of the lug part of the wheel is located on the support box side with respect to the axle part of the wheel in plan view described in [ I ] -1 and [ III ] -1 above can be easily obtained.

[ VII ] (Structure)

A seventh aspect of the present invention is the walking-type rice transplanter according to the sixth aspect of the present invention, as described below.

The right and left support boxes have mounting portions on the pipe portion,

a spring member that suppresses a difference in height between the right support case and the left support case is coupled so as to straddle the mounting portion of the right support case and the mounting portion of the left support case,

the mounting portion overlaps with a passing trajectory of the lug part when viewed from the side.

(action and Effect of the invention)

In some walking rice transplanters, a spring member is connected so as to straddle the right support box and the left support box, and a height difference between the right support box and the left support box is suppressed by the spring member.

According to a seventh feature of the present invention, the pipe portion of the support case has a mounting portion, the spring member is coupled to the mounting portion of the support case, and the mounting portion of the support case overlaps with a passing trajectory of the lug part of the wheel when viewed from the side.

Thus, the lug part of the wheel is displaced rearward from the front box of the support box, and a large space can be obtained on the front side of the wheel (near the front box of the support box), whereby maintenance work can be easily performed on the vicinity of the spring member from the front side of the wheel.

[ VIII ] (Structure)

An eighth aspect of the present invention is the walking-type rice transplanter according to the seventh aspect of the present invention, configured as follows.

The right and left support boxes are connected with a reinforcing member so as to cross the body center side portion of the front box and the mounting portion.

(action and Effect of the invention)

In the right and left support boxes, the pipe portion extends rearward in a cantilever manner from the front box of the support box, and therefore, as described in the eighth aspect of the present invention, the joint portion between the front box and the pipe portion of the support box can be reinforced by connecting the reinforcing member so as to straddle the body center side portion of the front box of the support box and the mounting portion of the pipe portion of the support box.

In this case, according to the eighth aspect of the present invention, since the reinforcing member is connected to the pipe portion of the support box by the mounting portion (see [ VII ] above) of the support box (pipe portion) for connecting the spring member, it is not necessary to provide a dedicated mounting portion for connecting the reinforcing member to the pipe portion of the support box, which is advantageous in simplifying the structure.

[ IX ] (Structure)

A ninth aspect of the present invention is the walking-type rice transplanter according to the eighth aspect of the present invention, configured as follows.

The right support box and the left support box connect the reinforcing member and the arm to the front box in a state where the arm is sandwiched between the center side portion of the machine body of the front box and the reinforcing member and in a state where the arm extends upward from the front box,

an operation force in the front-rear direction is applied to the arm portion, and the support box is operated to swing up and down.

(action and Effect of the invention)

In a walking type rice transplanter, an upward arm portion is connected to a front box of a support box, and a forward and backward operation force is applied to the arm portion by a hydraulic cylinder or the like to swing the support box up and down, thereby controlling the posture of a machine body.

According to the ninth aspect of the present invention, when the arm portion is coupled to the front box of the support box, the arm portion is sandwiched between the reinforcing member and the body center side portion of the front box of the support box, and the reinforcing member and the arm portion are coupled to the front box of the support box in a state where the arm portion extends upward from the front box of the support box. This allows the arm portion to be connected to the front box of the support box with sufficient strength.

[ X ] (structure)

A tenth aspect of the present invention is the walking-type rice transplanter according to the ninth aspect of the present invention, configured as follows.

The reinforcing member and the arm portion are bolted to the front case at a front portion and a rear portion of the transverse axis center of a machine body center side portion of the front case.

(action and Effect of the invention)

When the reinforcement member and the arm portion are joined to the front box of the support box as described in [ IX ] above, according to the tenth feature of the present invention, the load applied from the reinforcement member and the arm portion to the front box of the support box is dispersed to the front and rear portions of the front box of the support box, so that the load applied to the front box of the support box can be reduced.

[ XI ] (Structure)

An eleventh aspect of the present invention is the walking-type rice transplanter according to the tenth aspect of the present invention, configured as follows.

The reinforcing member and the arm portion are bolted to the front box by 1 bolt at a front portion of the lateral axis center of a central side portion of the machine body of the front box,

the reinforcement member and the arm portion are bolted to the front case by 2 bolts at a rear portion of the lateral axis center of the body center side portion of the front case.

(action and Effect of the invention)

In a state where the loads applied from the reinforcement member and the arm portion to the front box of the support box are dispersedly applied to the front and rear portions of the front box of the support box as described in [ X ], the load applied from the reinforcement member (the pipe portion of the support box) to the front box of the support box is applied to the rear portion of the front box of the support box more than the front portion of the front box of the support box (caused by the rear portion of the front box of the support box being close to the pipe portion of the support box).

At this time, according to the eleventh aspect of the present invention, the load applied from the reinforcing member (the pipe portion of the support box) to the rear portion of the front box of the support box can be supported with sufficient strength by 2 bolts.

[ XII ] (Structure)

A twelfth aspect of the present invention is the walking-type rice planting machine according to any one of the ninth to eleventh aspects of the present invention, configured as follows.

The arm portion has an extension portion extending rearward, and the extension portion is coupled to the mounting portion.

(action and Effect of the invention)

According to the twelfth feature of the present invention, the arm portion is joined to the front box of the support box (refer to [ IX ] above) and the arm portion is joined to the pipe portion of the support box, and therefore, the load from the arm portion is dispersed to be applied to the front box and the pipe portion of the support box, so that the load applied to the front box of the support box can be reduced.

In this case, according to the twelfth aspect of the present invention, since the extending portion of the arm portion is connected to the pipe portion of the support box by the mounting portion (see [ VII ] above) of the support box (pipe portion) for connecting the spring member, a dedicated mounting portion for connecting the extending portion of the arm portion to the pipe portion of the support box is not required, which is advantageous in simplifying the structure.

[ XIII ] (Structure)

A thirteenth aspect of the present invention is the walking-type rice transplanter according to any one of the ninth to twelfth aspects of the present invention configured as follows.

An operation force in the front-rear direction is applied to the arm portion via a suspension mechanism to swing the support box up and down,

the suspension mechanism has a plurality of coil springs arranged in a line in a state in which the orientations are reversed. (action and Effect of the invention)

When the upward arm portion is connected to the front box of the support box as described in [ IX ] above and the support box is operated to swing up and down by applying the longitudinal operating force to the arm portion by a hydraulic cylinder or the like, there is a configuration in which the longitudinal operating force is applied to the arm portion via the suspension mechanism.

In this case, according to the thirteenth aspect of the present invention, the suspension mechanism can be configured simply by providing a plurality of coil springs arranged in a line in a state of being oriented in a reciprocal manner and by exhibiting the suspension function by the plurality of coil springs.

Drawings

FIG. 1 is a left side view of the walking type rice transplanter.

FIG. 2 is a plan view of the walking rice transplanter.

Fig. 3 is a top view of the right support box and the wheel.

Fig. 4 is a cross sectional top view of the right support box and wheel.

Fig. 5 is a cross-sectional view taken along the direction V-V in fig. 4.

Fig. 6 is a sectional view taken along VI-VI in fig. 5.

Fig. 7 is a plan view of the pipe portion of the right support box.

Fig. 8 is a sectional view taken along line VIII-VIII in fig. 7.

Fig. 9 is a sectional view taken along direction IX-IX in fig. 7.

Fig. 10 is an exploded perspective view of the right support box (front box and tube portion), the arm portion, and the reinforcement member.

Fig. 11 is a longitudinal left side view of the connecting member of the left support box.

Fig. 12 is a cross-sectional view of the first alternative embodiment of the invention in fig. 4, viewed in the direction V-V. Description of the reference numerals

1: transmission case

7: supporting box

8: wheel of vehicle

8 a: axle part

8 b: spoke part

8 c: rim part

8 d: lug part

8 e: box-supporting end of lug

16: transmission shaft

22: reinforcing member

25: mounting part

26: arm part

26 d: extension part

27: bolt

28: bolt

30: spring component

31: bolt

35: front box

35 a: connecting part

35 c: side part of the center of the machine body

36: pipe section

36 a: flange part

36 c: wheel-side surface of pipe portion

37: rear box

44: coil spring

CL 1: the center of the pipe part in the left-right direction

CL 2: center of the connection part in the left-right direction

L11: the length from the center of the pipe part in the left-right direction to the end part of the flange part on the wheel side

L12: the length from the center of the pipe part in the left-right direction to the end part of the flange part on the center side of the machine body

P1: horizontal axis

W11: height of pipe part

W12: left and right width of pipe part

Detailed Description

As shown in fig. 1 to 4, F denotes "front" of the body, "B" rear "of the body," U "upper" of the body, and D "lower" of the body. In a state of being directed to the front of the body, R represents the "right" of the body, and L represents the "left" of the body.

[1]

The overall structure of the walking rice transplanter will be described below.

As shown in fig. 1 and 2, a transmission case 1 is provided at the center in the left-right direction of the front portion of the machine body, a support frame 2 is connected to the front portion of the transmission case 1, and an engine 3 is supported by the support frame 2. A tubular support frame 4 is connected to the rear part of the transmission case 1 and extends to the rear side, a seedling transplanting device 5 and a control handle 6 are connected to the rear part of the support frame 4, and a preliminary seedling carrying table 15 is supported on the support frame 4.

As shown in fig. 1 and 2, the right (left) support case 7 is supported to freely swing up and down around a lateral axis P1 in the left-right direction of the right portion (left portion) of the transmission case 1, and extends rearward. A right wheel 8 for traveling is rotatably supported on a right portion of the rear case 37 at the rear portion of the right support case 7, and a left wheel 8 for traveling is rotatably supported on a left portion of the rear case 37 at the rear portion of the left support case 7.

A central floating plate 9 is supported in the front-rear direction at the center in the left-right direction of the lower part of the machine body, a right floating plate 10 is supported in the front-rear direction at the right part of the lower part of the machine body, and a left floating plate 10 is supported in the front-rear direction at the left part of the lower part of the machine body.

As shown in fig. 1 and 2, the seedling planting device 5 is of a 4-row planting type having: a supply tank 11 disposed at the center of the body in the left-right direction and above the center floating plate 9; a central insertion box (not shown) connected to the lower part of the supply box 11; a right (left) transplanting box 12 disposed above the right (left) floating plate 10; insertion arms 13 provided at right and left portions of a lower portion of a central insertion box (not shown); an implanting arm 13 provided at a left portion (right portion) of a lower portion of the right (left) implanting case 12; and a seedling carrying platform 14 and the like.

According to the above configuration, as shown in fig. 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 transmitted to the right (left) wheel 8 via a transmission shaft 16 (see fig. 4) inside the right (left) support case 7. The 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 support box 7 and the left support box 7 will be described.

In this item [2] and the following [3] to [9], fig. 3 to 10 show the right support box 7 and the right wheel 8. At this time, the left support box 7 and the left wheel 8 are bilaterally symmetrical to the right support box 7 and the right wheel 8, and the structure is the same as that shown in fig. 3 to 10.

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

As shown in fig. 2, 3, and 4, the right (left) sleeve portion 1a extends from the right (left) lateral wall portion of the transmission case 1, the right (left) support case 7 (front case 35) is supported so as to be vertically swingable around the right (left) sleeve portion 1a of the transmission case 1 (lateral axis P1 of the transmission case 1), and the right (left) support case 7 extends rearward.

As shown in fig. 4, the transmission shaft 16 is rotatably supported inside the pipe portion 36 by the bearing 17 of the front case 35 and the bearing 17 of the rear case 37. The drive shaft 18 of the transmission case 1 is inserted into the interior of the front case 35 from the interior of the sleeve portion 1a of the transmission case 1, and supports the bearing 19 in the interior of the front case 35, and the bevel gear 18a of the drive shaft 18 engages with the bevel gear 16a of the drive shaft 16. The axle 20 is rotatably supported by the rear case 37 through a bearing 21, and a bevel gear 16b of the drive shaft 16 engages with a bevel gear 20a of the axle 20.

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 transmission shaft 16 via the bevel gear 18a of the transmission shaft 18 and the bevel gear 16a of the transmission shaft 16, and is transmitted to the axle 20 via the bevel gear 16b of the transmission shaft 16 and the bevel gear 20a of the axle 20, thereby rotationally driving the axle 20 (the wheels 8).

[3]

Next, the front case 35, the pipe portion 36, and the rear case 37 will be described with respect to the right support case 7 and the left support case 7.

As shown in fig. 4, 5, 6, and 10, the front case 35 has a planar coupling portion 35a at the rear portion thereof, a sleeve portion 35b at the left portion (right portion) of the front case 35, and the sleeve portion 1a of the transmission case 1 is fitted into the sleeve portion 35b of the front case 35.

As shown in fig. 4, 5, 6, and 10, a flange portion 35c (corresponding to the center side portion of the machine body) surrounding the entire circumference of the sleeve portion 35b of the front case 35 is provided in the sleeve portion 35b of the

front case

35, and 1 sleeve portion 35d is provided in the front portion of the flange portion 35c of the

front case

35, and 2 sleeve portions 35e are provided in the rear portion of the flange portion 35c of the front case 35.

As shown in fig. 8 and 9, the pipe portion 36 is formed in a rectangular pipe shape having a rectangular cross section with a lateral width W12 smaller than a vertical height W11, and the pipe portion 36 is disposed such that a side surface 36c of the pipe portion 36 on the wheel 8 side is along the vertical direction. The flange portion 36a of the pipe portion 36 is formed in a rectangular shape when viewed from the front, and has 4

bolt holes

36d and 36e opened therein.

As shown in fig. 7 and 8, a length L11 from the center CL1 in the left-right direction of the pipe portion 36 to the end portion on the wheel 8 side of the flange portion 36a of the pipe portion 36 is longer than a length L12 from the center CL1 in the left-right direction of the pipe portion 36 to the end portion on the body center side of the flange portion 36a of the pipe portion 36 when viewed from above and from the front.

Thus, the length from the center CL1 in the left-right direction of the pipe portion 36 to the bolt hole 36d of the pipe portion 36 is longer than the length from the center CL1 in the left-right direction of the pipe portion 36 to the bolt hole 36e of the pipe portion 36 when viewed from above and from the front.

As shown in fig. 4, the flange portion 36a of the pipe portion 36 and the coupling portion 35a of the front case 35 are positioned such that the center CL1 in the left-right direction of the pipe portion 36 is located on the center side of the machine body (the side opposite to the wheel 8) with respect to the center CL2 in the left-right direction of the coupling portion 35a of the front case 35 in plan view, and the flange portion 36a of the pipe portion 36 is coupled to the coupling portion 35a of the front case 35 by 4 bolts 38 (

bolt holes

36d, 36 e).

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 has 3

bolt holes

36f and 36 g.

As shown in fig. 4, in the flange portion 36b of the pipe portion 36 and the rear case 37, a portion of the flange portion 36b of the pipe portion 36 on the machine body center side (the side opposite to the wheel 8) is coupled to the rear case 37 by 1 bolt 39 (bolt hole 36f) and a portion of the flange portion 36b of the pipe portion 36 on the wheel 8 side is coupled to the rear case 37 by 2 bolts 39 (bolt hole 36g) in a plan view.

[4]

Next, the spring member 30 coupled so as to straddle the right support case 7 and the left support case 7 will be described.

As shown in fig. 3, 4, 5, and 10, the right support case 7 and the left support case 7 are connected by welding to the side surface of the tube portion 36 on the machine body center side (the side opposite to the wheel 8) with a mounting portion 25, and the mounting portion 25 is formed by bending a plate material. As shown in fig. 2, 3, and 10, the right end of the spring member 30 is bolted to the upper surface 25a of the mounting portion 25 of the right support case 7 (pipe portion 36), and the left end of the spring member 30 is bolted to the upper surface 25a of the mounting portion 25 of the left support case 7 (pipe portion 36).

As shown in fig. 2 and 3, the spring member 30 is a flat plate spring, and an upper flat surface of the spring member 30 faces upward, and a lower flat surface of the spring member 30 faces downward.

When a level difference is to be generated between the right support box 7 and the left support box 7, a state in which a level difference is generated between the right support box 7 and the left support box 7 at once and a state in which a large level difference is generated between the right support box 7 and the left support box 7 are suppressed by the spring member 30, so that an appropriate level difference can be generated between the right support box 7 and the left support box 7 gradually.

[5]

Next, the connection relationship between the front case 35 and the pipe portion 36 will be described with respect to the right support case 7 and the left support case 7.

As described in [8] below, the structure for operating the right and left support boxes 7, 7 in a swinging manner includes an arm portion 26 for operating the right and left support boxes 7, 7 in a swinging manner, as shown in fig. 1, 2 and 3.

As shown in fig. 10, the arm portion 26 is formed by bending a plate material, and includes a pair of

vertical wall portions

26a and 26b, a middle wall portion 26c connecting the

vertical wall portions

26a and 26b, an extending portion 26d extending downward from one of the vertical wall portions 26a, a tube portion 26e connected to the

vertical wall portions

26a and 26b, and nuts 26f and 26g connected to the vertical wall portion 26 b.

As shown in fig. 10, a reinforcing member 22 is provided. The reinforcing member 22 is made of a plate material and has a

large opening

22a and 4

bolt holes

22b, 22c, and 22 d. At this time, the sleeve portion 1a of the transmission case 1 is inserted into the opening 22a of the reinforcing member 22 in advance.

As shown in fig. 5, 6, and 10, in a state where the vertical wall portion 26a of the arm portion 26 faces the center of the machine body and the vertical wall portion 26b of the arm portion 26 faces 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

vertical wall portions

26a, 26b of the arm portion 26.

In the above state, as shown in fig. 5, 6 and 10, the nut 26f of the arm portion 26 faces the sleeve portion 35d of the front case 35, and the nut 26g and the extended portion 26d of the arm portion 26 face the sleeve portion 35e of the front case 35.

The reinforcing member 22 abuts on the arm portion 26 (the vertical wall portion 26a and the extended portion 26d) and abuts on the side surface 25b of the mounting portion 25.

As shown in fig. 5, 6, and 10, in a portion of the flange portion 35c of the front case 35 located on the front side of the transverse axis P1 (the boss portion 1a of the transmission case 1), the bolt 27 is inserted through the bolt hole 22b of the reinforcing member 22, 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 the nut 26f of the arm portion 26 (the vertical wall portion 26b) is inserted and tightened.

As shown in fig. 5, 6, and 10, in the flange portion 35c of the front case 35, at the upper side of the rear side of the transverse axis P1 (the sleeve portion 1a of the transmission case 1), the bolt 28 is inserted through the bolt hole 22c of the reinforcing member 22, the bolt hole of the vertical wall portion 26a of the arm portion 26, and the sleeve portion 35e at the upper side of the front case 35, and the nut 26g of the arm portion 26 (the vertical wall portion 26b) is inserted and tightened.

As shown in fig. 5, 6, and 10, in a portion of the flange portion 35c of the front case 35 located on the lower side of the rear side of the transverse axis P1 (the boss portion 1a of the transmission case 1), the bolt 31 is inserted through the bolt hole 22c of the reinforcing member 22, the bolt hole of the extension portion 26d of the arm portion 26, and the boss portion 35e on the lower side of the front case 35, and is tightened by the nut 33.

The bolt 32 is inserted into the bolt hole 22d of the reinforcing member 22, and the reinforcing member 22 is coupled to the side surface 25b of the mounting portion 25 by the bolt 32.

[6]

According to the structure described in the above [5], the present invention assumes the following state.

As shown in fig. 3, 5, and 10, the right support case 7 and the left support case 7 are connected to a reinforcing member 22 so as to straddle the flange portion 35c (the machine body center side portion) of the front case 35 and the mounting portion 25 of the pipe portion 36.

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

As shown in fig. 5, 6, and 10, the reinforcing member 22 and the arm portion 26 are bolted to the front case 35 at a portion of the flange portion 35c (the machine body center side portion) of the front case 35 located on the front side and the rear side of the transverse axis P1 (the sleeve portion 1a of the transmission case 1).

As shown in fig. 5, 6, and 10, the reinforcing member 22 and the arm portion 26 are bolted to the front case 35 by 1 bolt 27 at a portion of the flange portion 35c (the machine body center side portion) of the front case 35 located on the front side of the lateral axis P1 (the sleeve portion 1a of the transmission case 1).

The reinforcement member 22 and the arm portion 26 are bolted to the front case 35 by 2

bolts

28 and 31 at a portion of the flange portion 35c (body center side portion) of the front case 35 located on the rear side of the transverse axis P1 (sleeve portion 1a of the transmission case 1).

[7]

Next, the relationship between the left (right) support case 7 and the left (right) wheel 8 will be described.

As shown in fig. 3 and 4, the wheel 8 includes a sleeve-shaped axle portion 8a coupled to the axle 20, a plurality of spoke portions 8b coupled to the axle portion 8a and extending from the axle portion 8a in a direction radially outward of the wheel 8 and inclined toward the support box 7, an annular rim portion 8c coupled to outer ends of the spoke portions 8b, and lug portions 8d projecting from the rim portion 8c to both the left and right and wider than the rim portion 8c and coupled to the rim portion 8 c.

Thus, as shown in fig. 3 and 4, the end portion 8e of the lug portion 8d of the wheel 8 on the support case 7 side is positioned closer to the support case 7 side than the axle portion 8a of the wheel 8 in plan view.

As shown in fig. 3 and 4, the lug part 8d of the right (left) wheel 8 approaches the right (left) support case 7 by extending the spoke part 8b of the right (left) wheel 8 in a direction inclined toward the right (left) support case 7.

At this time, as shown in fig. 3, when viewed from the front (when viewed from F to B), the passing locus of the front case 35 and the lug part 8d of the wheel 8 overlaps in the range W13.

The mounting portion 25 of the support case 7 (the pipe portion 36) overlaps the locus of travel of the lug part 8d of the wheel 8 over the range W14 when viewed from the side (when viewed from R to L or from L to R), and the front case 35 does not overlap the locus of travel of the lug part 8d of the wheel 8 when viewed from the side (the lug part 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 4, the following 2 points can be obtained. That is, "the flange portion 36a of the pipe portion 36 is connected to the connecting portion 35a of the front case 35 by 4 bolts 38 (

bolt holes

36d, 36 e)" so that the center CL1 in the left-right direction of the pipe portion 36 is located on the center side of the machine body (the side opposite to the wheel 8) with respect to the center CL2 in the left-right direction of the connecting portion 35a of the front case 35 in a plan view with respect to the flange portion 36a of the pipe portion 36 and the connecting portion 35a of the front case 35 "(refer to [3] above); and

the pipe portion 36 is formed in a rectangular pipe shape having a rectangular cross section and a lateral width W12 smaller than a vertical height W11, and the pipe portion 36 is disposed so that a side surface 36c of the pipe portion 36 on the wheel 8 side is along the vertical direction (see [3] above).

As a result, as shown in fig. 3 and 4, the right (left) support case 7 (pipe portion 36) is displaced toward the center of the machine body from the locus of passage of the lug part 8d of the right (left) wheel 8, and the locus of passage of the lug part 8d of the right (left) wheel 8 is separated from the right (left) support case 7 (pipe portion 36) by a space W15.

[8]

Next, a description will be given of a swing operation structure of the right support box 7 and the left support box 7.

As shown in fig. 1 and 2, the hydraulic cylinder 23 is supported in the support frame 2 so as to face rearward, and the connecting member 24 is supported at the tip end portion of the piston 23a of the hydraulic cylinder 23 so as to be swingable about a vertical axis P2 in the vertical direction.

As shown in fig. 1 and 2, the connecting member 29 is connected so as to straddle the right end portion and the right arm portion 26 (tube portion 26e) of the connecting member 24, and the connecting member 29 is connected so as to straddle the left end portion and the left arm portion 26 (tube portion 26e) of the connecting member 24.

Thus, when the hydraulic cylinder 23 extends, the link member 24 moves rearward, and the right support box 7 and the left support box 7 are swung downward. When the hydraulic cylinder 23 contracts, the link member 24 moves forward, and the right support case 7 and the left support case 7 are swung upward.

As shown in fig. 2, the link member 24 is supported so as to be swingable about a longitudinal axis P2 of the piston 23a of the hydraulic cylinder 23.

Thus, when the body attempts to tilt in the left-right direction due to the irregularities of the plow bottom (hard portion located below the agricultural surface) where the right wheel 8 and the left wheel 8 contact, the center float 9 and the side float 10 become resistance to the tilting of the body, and the connection member 24 is swung around the vertical axis P2 to, for example, raise the right wheel 8 and lower the left wheel 8, thereby generating a difference in height between the right support box 7 and the left support box 7, thereby suppressing the tilting of the body.

At this time, as described in [4], a state in which a height difference occurs rapidly between the right support box 7 and the left support box 7 and a state in which a large height difference occurs between the right support box 7 and the left support box 7 are suppressed by the spring member 30, and a state in which an appropriate height difference gradually occurs between the right support box 7 and the left support box 7 can be obtained.

[9]

Next, the suspension mechanism will be described with reference to the connection member 29.

As shown in fig. 11, the connecting member 29 is formed of a groove-shaped member, a receiving portion 29a is connected to an intermediate portion of the connecting member 29, and a rear portion of the connecting member 29 is connected to a pipe portion 26e of the arm portion 26 by a connecting pin 34.

As shown in fig. 11, a front portion of the link member 29 is opened with a long hole 29b along the front-rear direction, a link pin 40 is connected to a right (left) end portion of the link member 24, and the link pin 40 is inserted into the long hole 29b of the link member 29. The link 41 is disposed inside the link member 29, and a bracket 41a coupled to a front portion of the link 41 is attached to the link pin 40.

As shown in fig. 11, the rear portion of the tie rod 41 is inserted into the receiving portion 29a of the connection member 29 so as to be slidable in the front-rear direction, and the nut 42 and the washer 43 for retaining are attached to the rear portion of the tie rod 41. Between the receiving portion 29a of the connecting member 29 and the bracket 41a of the link 41, a plurality of coil springs 44 are fitted to the link 41, and the coil springs 44 are arranged in a line in a state of being inverted to each other.

The state shown in fig. 11 is a state in which the washer 43 abuts on the receiving portion 29a of the link member 29 and the suspension mechanism is extended to the longest. In this state, the coil spring 44 is compressed by the receiving portion 29a of the connecting member 29 and the bracket 41a of the link 41, and at this time, the coil spring 44 forms resistance, thereby causing the link 41 and the coil spring 44 to function as a suspension mechanism.

Accordingly, as described in [8], when the right support box 7 and the left support box 7 are operated to swing up and down by the telescopic operation of the hydraulic cylinder 23, the right support box 7 and the left support box 7 are operated to swing up and down via the suspension mechanism.

[10]

Next, the positional relationship between the transplanting rows L1 to L4 and the central float plate 9 and the side float plates 10 will be described.

As shown in fig. 2, the transplanting rows L1 to L4 are rows formed along the machine body traveling direction of seedlings transplanted on the agricultural land by the transplanting arms 13, and there are 4 transplanting rows L1 to L4 corresponding to the 4 transplanting arms 13. At this time, the rear side of the transplanting arm 13 is a transplanting row L1 to L4 after transplanting seedlings, and the front side of the transplanting arm 13 is a transplanting row L1 to L4 before transplanting seedlings.

As shown in fig. 1 and 2, the transplanting arm 13 of the transplanting row L1 is the transplanting arm 13 supported by the left transplanting box 12. The transplanting arms 13 of the transplanting rows L2 and L3 are the transplanting arms 13 supported by a central transplanting box (not shown). The transplanting arm 13 of the transplanting row L4 is the transplanting arm 13 supported by the right transplanting box 12.

As shown in fig. 2, there are 3 inter-row spacings W1, W2 corresponding to 4 inter-row spaces L1-L4. The 4 implant arms 13 are arranged in the left-right direction in the following manner. That is, the central insertion row pitch W1, which is the interval between the left adjacent insertion row L2 and the right adjacent insertion row L3 at the center in the left-right direction of the body, is larger than the 2 insertion row pitches W2 other than the central insertion row pitch W1, and the 2 insertion row pitches W2 other than the central insertion row pitch W1 are the same interval.

As shown in fig. 2, in the central floating plate 9, the width of the middle portion 9b of the central floating plate 9 is narrower than the width of the front portion 9a of the central floating plate 9, and the width of the rear portion 9c of the central floating plate 9 is narrower than the width of the middle portion 9b of the central floating plate 9. The transplanting arms 13 are located on the rear sides of the right and left portions of the intermediate portion 9b of the central floating plate 9 (the right and left sides of the rear portion 9c of the central floating plate 9).

As shown in fig. 2, the width of the rear portion 10b of the side float plate 10 is narrower than the width of the front portion 10a of the side float plate 10 with respect to the side float plate 10. At the left portion (right portion) of the front portion 10a of the right (left) side floating plate 10, there is an inclined portion 10c extending obliquely. The transplanting arm 13 is located on the rear side of the inclined portion 10c of the right (left) side floating plate 10 (left (right) side of the rear portion 10b of the right (left) side floating plate 10).

As shown in fig. 2, in the central floating plate 9, in a plan view, the front portion 9a and the middle portion 9b of the central floating plate 9 overlap with the transplanting rows L2, L3 before seedling transplanting, and the rear portion 9c of the central floating plate 9 is offset toward the center of the body from the transplanting rows L2, L3 after seedling transplanting.

As shown in fig. 2, in the side floating plate 10, the inclined portion 10c of the side floating plate 10 slightly overlaps with the transplanting rows L1, L4 before seedling transplanting in plan view. In a plan view, the rear portion 10b of the side floating plate 10 is offset outward from the transplanting rows L1, L4 after the seedlings are transplanted into the machine body.

[11]

Next, the positional relationship between the planting rows L1 to L4 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 plate 10 is small in plan view, and a virtual line extending rearward from the end of the axle 20 (the axle portion 8a of the wheel 8) and a virtual line extending forward from the end of the inclined portion 10c of the side float plate 10 are located at substantially the same position in plan view.

In the above state, as shown in fig. 3 and 4, the spoke portion 8b of the wheel 8 extends from the spindle portion 8a of the wheel 8 in a direction inclined outward in the radial direction of the wheel 8 toward the support case 7 side.

Thus, the rim portion 8c and the lug portion 8d of the right wheel 8 are positioned between the insertion rows L3, L4 in plan view, and are sufficiently separated from the insertion row L4 toward the center of the machine body. The rim portion 8c and the lug portion 8d of the left wheel 8 are positioned between the insertion rows L1, L2 in plan view, and are sufficiently separated from the insertion row L1 toward the center of the machine body. (first other embodiment of the invention)

In the above-described "embodiment," as shown in fig. 12, the extending portion 26d of the arm portion 26 may extend rearward, and the extending portion 26d of the arm portion 26 may be coupled to the mounting portion 25 together with the reinforcing member 22 by the bolt 32.

(second other embodiment of the invention)

In the above-described "embodiment" and "first another embodiment of the invention", the pipe portion 36 may be formed not in a rectangular square pipe shape having a rectangular cross section but in a square pipe shape having a square cross section.

(availability in industry)

The present invention can be applied not only to a walking type rice transplanter in which a rice seedling planting device is formed into a 4-row planting type, but also to a walking type rice transplanter provided with a 6-row planting type rice seedling planting device having 6 planting arms (5 planting row pitches).

Claims

1. A walking type rice transplanter is characterized in that,

the front part of the machine body is provided with a transmission case,

2. The walking rice transplanter according to claim 1,

3. A walking type rice transplanter is characterized in that,

the front part of the machine body is provided with a transmission case,

4. A walking type rice transplanter according to any one of claims 1 to 3,

5. A walking type rice transplanter according to any one of claims 1 to 3,

6. A walking type rice transplanter according to any one of claims 1 to 3,

7. A walking type rice transplanter according to claim 6,

the right and left support boxes have mounting portions on the pipe portion,

8. A walking type rice transplanter according to claim 7,

9. The walking rice transplanter according to claim 8,

10. The walking rice transplanter according to claim 9,

11. The walking rice transplanter according to claim 10,

12. A walking rice transplanter according to any one of claims 9 to 11,

13. A walking rice transplanter according to any one of claims 9 to 11,

the suspension mechanism has a plurality of coil springs arranged in a line in a state in which the orientations are reversed.