JP6175376B2 - Rotary tillage device - Google Patents

Description

  The present invention relates to a rotary tiller.

There is one disclosed in Patent Document 1 as a rotary tiller.
This rotary tiller is provided with a claw shaft supported on a machine frame attached to the rear portion of the tractor so as to be rotatable about a left-right axis. A number of claw mounting flanges are provided on the claw shaft at intervals in the claw shaft axis direction. The base of the tilling claw is fixedly attached to each claw mounting flange by a pair of claw mounting bolts.

The base of the tilling claw is superimposed on the side surface of the claw mounting flange, the pair of claw mounting bolts pass through the base of the tilling claw and the claw mounting flange, and the claw mounting nut is screwed into each nail mounting bolt and tightened. Thus, the tilling claw is fixedly attached to the claw mounting flange.
In the rotary tiller, when the nail shaft is driven to rotate about the axis, the nail mounting flange and the tilling nail rotate together with the nail shaft, and the soil is cultivated by the rotating tillage nail.

  On the other hand, as a tilling nail attached to the nail attachment flange, an L-type nail and a nail nail different from the L-type nail are known.

Japanese Patent Laid-Open No. 2008-22716

The claw that is an L-shaped claw is different from the claw length and the hole pitch of the claw mounting bolt insertion hole through which the claw mounting bolt is inserted, and the number of the claw mounting flanges that are attached to the claw mounting flange is also different.
Therefore, in the conventional rotary tiller, the present condition is that only one kind of tillage claw can be attached to one rotary tiller.
On the other hand, it is convenient if the specification can be changed between the L-type claw specification and the claw specification with the same rotary tiller. In addition, L-shaped claws are suitable when it is desired to make the soil finer, and nails are suitable when reversibility of the soil is required. If it can be set selectively, it will be highly evaluated in the market.

  Then, in view of the said problem, this invention makes it a subject to provide the rotary tilling apparatus which can selectively attach a different kind of tilling nail | claw.

The technical means taken by the present invention to solve the technical problems are characterized by the following points.
First , a plurality of claw mounting flanges are provided on the outer periphery of the claw shaft that can be driven to rotate about the shaft center in the claw shaft axis direction, and a first claw mounting portion for mounting the first tillage claw on each claw mounting flange Are provided in the circumferential direction of the claw mounting flange, and a second claw mounting portion for mounting a second tilling claw of a different type from the first cultivating claw on the inner peripheral side of the claw mounting flange of the first claw mounting portion. Are provided in the circumferential direction of the claw mounting flange, and the first tilling claw and the second tilling claw are selectively fastened and fixed to the claw mounting flange via a claw mounting bolt, and the first claw mounting portion and the second claw mounting flange The claw mounting portion includes a claw mounting bolt insertion hole through which the claw mounting bolt is inserted. The claw mounting bolt insertion hole of the first claw mounting portion provided on one claw mounting flange is centered on the axis of the claw shaft. The first claw mounting flange is formed on the first circumference. The claw mounting bolt insertion hole of the second claw mounting portion is formed on a second circumference centered on the axis of the claw shaft and on the inner side of the first circumference, and on the axis of the claw shaft. And the second tillage claw is positioned on one side in the claw axis rotation direction on the second circumference. The claw attachment bolt insertion hole can be attached, and the other side in the claw shaft rotation direction can be attached to the claw attachment bolt insertion hole located on the third circumference .

Second, a plurality of claw mounting flanges are provided on the outer periphery of the claw shaft that can be driven to rotate about the shaft center in the claw shaft axis direction, and a first claw mounting portion for mounting the first tilling claw on each claw mounting flange Are provided in the circumferential direction of the claw mounting flange, and a second claw mounting portion for mounting a second tilling claw of a different type from the first cultivating claw on the inner peripheral side of the claw mounting flange of the first claw mounting portion. Are provided in the circumferential direction of the claw mounting flange, and the first tilling claw and the second tilling claw are selectively fastened and fixed to the claw mounting flange via a claw mounting bolt, and the first claw mounting portion and the second claw mounting flange Each of the claw mounting portions includes a pair of claw mounting bolt insertion holes through which the claw mounting bolts are inserted, and the second tilling claw includes a pair of claw mounting bolt insertion holes constituting the second claw mounting portion. One that can be attached to one of the claw mounting bolt insertion holes A mounting portion and a second mounting portion attachable to the other claw mounting bolt insertion hole, and a straight line connecting the one mounting portion and the other mounting portion in a state of being mounted to the second claw mounting portion. A straight line perpendicular to the midpoint is deviated from the center of the claw mounting flange .
Thirdly, the number of the first tilling claws attached to one piece of the claw mounting flange is different from the number of the second tilling claws .

Fourth, the plurality of second claw attachment portions are arranged at the same pitch in the circumferential direction of the claw attachment flange, and the plurality of first claw attachment portions are arranged at a plurality of different pitches in the circumferential direction of the claw attachment flange. It is characterized by being arranged by .
Fifth, the first tillage claw is attached to one side of the claw attachment flange, and the second tillage claw is attached to one side and the other side of the claw attachment flange, respectively. Features.
Sixth, the plurality of claw mounting flanges are sequentially arranged with a phase shifted in the claw axis rotation direction from one side to the other in the claw axis direction, and separated in the claw axis direction. A cigarette prevention member is disposed between the pair of claw attachment flanges, and the cigarette prevention member is inserted into a claw attachment bolt insertion hole that is not used in the claw attachment flange. It is arranged between the flanges and around the claw shaft in a spiral shape.

The present invention has the following effects.
According to the present invention , different types of tilling claws can be selectively attached to the pawl mounting flange of one rotary tiller, and one rotary tiller can be changed to specifications according to work. . Moreover, since the 2nd nail attachment part was provided in the nail attachment flange inner peripheral side of the 1st nail attachment part, the attachment position of the 1st tillage nail and the attachment position of the 2nd tillage nail can be identified easily. Can prevent mistakes in plowing nails.

In addition, using the claw mounting bolt insertion hole of the claw mounting portion that is not used among the first mounting portion and the second mounting portion, it is possible to pass the grass winding prevention member to the claw mounting flange, It is not necessary to separately form a hole for insertion of the cigarette prevention member in the claw mounting flange, and the cost increase can be suppressed.

It is a side view which shows the state which mounted | wore the rotary cultivator with the rear part of the tractor vehicle body by the three-point link mechanism. It is a back surface partially expanded sectional view of a rotary tillage apparatus. It is a side view at the time of attaching an L type nail to a nail attachment flange, and shows the state where an L type nail was attached to an intermediate nail attachment flange. (A) is a back surface expanded sectional view of the rotary tillage part at the time of attaching an L-type nail | claw, (b) is a back surface partial sectional view which shows the modification of the fixing means of the edge part of a cigarette prevention member. It is a side view at the time of attaching a nail | claw to the claw attachment flange, and has shown the state which attached the claw to the claw attachment flange of the right end as an example. It is a rear view of a rotary tillage part at the time of attaching a nail | claw.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
1 and 2, reference numeral 1 denotes a side drive type rotary tiller.
The rotary tiller 1 is connected to the rear portion of the tractor vehicle body 2 through a connecting mechanism such as a three-point link mechanism 3 so as to be lifted and lowered.
As shown in FIGS. 1 and 2, the rotary tiller 1 includes a gear case 4 located at the center in the left-right direction, support arms 5L and 5R protruding from the gear case 4 to the left and right sides, and one (left side). A rotary machine casing 8 having a transmission case 6 attached to the outer end of the support arm 5L and a side frame 7 attached to the other (right) support arm 5R is provided.

At the lower portions of the transmission case 6 and the side frame 7, rotary shafts 9 are provided so as to be rotatable around the left and right axes, respectively. A claw shaft 10 having a horizontal axis is provided between the rotation shafts 9, and the claw shaft 10 is connected to each rotation shaft 9.
The rotary machine frame 8 is provided with left and right connecting brackets 11 and a mast 12. The left and right connecting brackets 11 are connected to the rear ends of a pair of left and right lower links 13 of the three-point link mechanism 3, and the mast 12 has a three-point link mechanism. 3 top links 14 are connected.

  The gear case 4 is provided with a PIC shaft 15, and rotational power is transmitted to the PIC shaft 15 from the PTO shaft 16 of the tractor vehicle body 2 through a joint 17. The power transmitted to the PIC shaft 15 is transmitted to the left rotation shaft 9 via the gear transmission mechanism 18 in the gear case 4, the transmission shaft 19 in the left support arm 5 </ b> L, and the chain transmission mechanism 20 in the transmission case 6. The The claw shaft 10 is rotationally driven around the axis by the power transmitted to the left rotation shaft 9.

The claw shaft 10 is driven to rotate in the direction of arrow A shown in FIG. A claw attachment flange 21 is fixed to the claw shaft 10, and tilling claws 22 </ b> A and 22 </ b> B are attached and fixed to the claw attachment flange 21. These claw shaft 10, claw mounting flange 21, and tilling claws 22A and 22B form a rotary tilling portion 23.
The upper part of the rotary tiller 23 is covered with a main cover 24 (rotary cover), and the rear of the rotary tiller 23 is covered with a rear cover (rotary cover) (not shown).

A skid 25 for adjusting the tilling depth is attached to the side frame 7 and the transmission case 6 so as to be adjustable in the vertical position and detachably. Only one of the left and right skids 25 may be provided.
In this rotary tiller 1, the rotary tiller 23 is driven to rotate in the direction of arrow A in FIG. 1, so that the tilling claws 22 </ b> A and 22 </ b> B enter the soil and plow the soil. The crushed soil is thrown back and hit the rear cover to crush the soil.

The claw shaft 10 is a cylindrical rotating shaft having a left-right axis, and the claw mounting flange 21 is provided in a plurality (a plurality) at regular intervals in the axial direction (left-right direction) of the claw shaft 10. It has been.
In the present embodiment, the claw mounting flanges 21 fixed to both ends of the claw shaft 10 in the axial direction are bolted to the rotary shaft 9. In addition, you may provide the flange for a connection attached and fixed to the rotating shaft 9 in the both ends of the axial direction of the nail | claw axis | shaft 10. FIG.

Two different types of tilling claws 22A and 22B can be selectively attached to the claw mounting flange 21. In the present embodiment, the L-shaped claw 22A (first tilling claw) and the claw 22B (second tilling claw) can be selectively attached. Note that the L-shaped claw 22A may be referred to as an L-curve claw, and the egg nail 22B may be referred to as a C-curve claw.
2 to 4 show a case where the L-shaped claw 22A is attached to each claw mounting flange 21, and FIGS. 5 and 6 show a case where the claw 22B is attached to each claw mounting flange 21. FIG. Show. In addition, when the L-type claw 22A or the heel claw 22B is attached to the claw mounting flange 21, for example, the L-type claw 22A is attached when soil crushing property is required, and the heel claw 22B is soil reversal. Installed when required. In the illustrated example, six L-shaped claws 22 </ b> A can be attached to one claw mounting flange 21, and four nails 22 </ b> B can be attached to one claw mounting flange 21.

  As shown in FIGS. 3 and 5, the claw mounting flange 21 is configured by a ring-shaped disk, is fitted concentrically on the claw shaft 10, and is fixed to the claw shaft 10 by welding or the like. A plurality (six in this embodiment) of first claw mounting portions 28 for mounting the L-shaped claw 22 </ b> A are provided on the outer peripheral side of the claw mounting flange 21 in the circumferential direction of the claw mounting flange 21. One L-shaped claw 22A is attached to one first claw attaching portion 28.

  The first claw mounting portion 28 is constituted by a pair of claw mounting bolt insertion holes 29F and 29R before and after the claw shaft rotation direction A. The claw mounting bolt insertion holes 29F and 29R are formed through the claw mounting flange 21. Further, the claw mounting bolt insertion holes 29F and 29R of all the first claw mounting portions 28 provided in one claw mounting flange 21 are formed on the same circumference X centered on the axis of the claw shaft 10. Yes.

The claw mounting flange 21 includes a plurality of second claw mounting portions 30 for mounting the claw 22B in the circumferential direction of the claw mounting flange 21 on the inner peripheral side of the claw mounting flange 21 of the first claw mounting portion 28. (Four in this embodiment) are provided. One single claw 22B is attached to one second claw attachment portion 28.
The second claw mounting portion 30 has a pair of claw mounting bolt insertion holes 31F, 31 in the claw shaft rotation direction A front and rear.
The claw mounting bolt insertion holes 31 </ b> F and 31 </ b> R are formed through the claw mounting flange 21. Of the claw mounting bolt insertion holes 31F and 31R, the claw mounting bolt insertion hole 31F on the front side in the claw shaft rotation direction A is formed on the same circumference Y centering on the axis of the claw shaft 10 to rotate the claw shaft. The claw mounting bolt insertion hole 31R on the rear side in the direction A is formed on the same circumference Z located on the outer diameter side than the claw mounting bolt insertion hole 31F on the front side in the claw shaft rotation direction A.

The claw mounting flanges 21 are sequentially arranged with a phase shift of 20 ° in the claw axis rotation direction A from one side to the other side in the left-right direction.
As shown in FIGS. 2 and 3, the L-shaped claw 22 </ b> A is formed by bending a plate material into an L-shape, and a mounting base 32 attached to the claw mounting flange 21, and the claw mounting flange 21 from the mounting base 32. A vertical plate portion 33 extending in the direction of shifting to the rear of the claw shaft rotation direction A as it goes radially outward, and a horizontal plate portion 34 extending in the left-right direction from the extended end side of the vertical plate portion 33 Have. The attachment base portion 32 and the vertical plate portion 33 are attached so that the plate surfaces face the left and right directions, and the horizontal plate portion 34 is substantially orthogonal to the vertical plate portion 33.

Blade portions are respectively formed on the front edge side of the vertical plate portion 33 and the horizontal plate portion 34 in the claw axis rotation direction A. The horizontal plate portion 34 also has a blade on the outer end portion in the extending direction from the vertical plate portion 33. The part is formed.
Further, the attachment base 32 of the L-shaped claw 22A has a pair of claw attachment bolt insertion holes 29F and 29R constituting the first claw attachment 28 in a state where the attachment base 32 is superimposed on the side surface of the claw attachment flange 21. A pair of bolt insertion holes 35 </ b> F and 35 </ b> R corresponding to is formed through.

  As shown in FIG. 4, the L-type claw 22A has its mounting base 32 superimposed on one side surface of the claw mounting flange 21, and the bolt insertion holes 35F and 35R of the L-type claw 22A and the first claw mounting portion 28. The claw mounting bolt insertion holes 29F and 29R are aligned with each other, the claw mounting bolts 36 are inserted into the bolt insertion holes 35F and 35R and the claw mounting bolt insertion holes 29F and 29R, and the claw mounting nuts 37 are inserted into the claw mounting bolts 36. The L-shaped claw 22A is fastened and fixed to the claw mounting flange 21 by screwing.

  In the present embodiment, the right-side L-shaped claw 22A bent toward the side frame 7 is attached to the right side of the left end claw mounting flange 21, and the transmission case is attached to the left side of the right end claw mounting flange 21. A left-facing L-shaped claw 22A that is bent toward the 6th side is attached. Further, in the other claw mounting flange 21, the L-shaped claw 22 </ b> A facing right and the L-shaped claw 22 </ b> A facing left are alternately mounted on the left side surface of the mounting flange 21 in the claw axis rotation direction A.

As shown in FIGS. 5 and 6, the above-mentioned claw 22B is formed by bending a plate material into a curved shape, and an attachment base 38 to be attached to the claw attachment flange 21 and the claw attachment flange 21 from the attachment base 38. A straight blade portion 39 extending in the direction of shifting to the rear of the claw axis rotation direction A as it goes radially outward, and a curved portion 40 extending from the straight blade portion 39 in the left-right direction from the extending end side. .
The attachment base portion 38 and the straight blade portion 39 are attached so that the plate surfaces face the left and right directions, and the bending portion 40 is bent in a curved shape from one side surface to the other side surface in the plate thickness direction of the straight blade portion 39.

On the front edge side of the straight blade portion 39 and the bending portion 40 in the claw axis rotation direction A, blade portions are respectively formed.
Further, the mounting base portion 38 of the nail 22B has a pair of claw mounting bolt insertion holes 31F and 31R that constitute the second claw mounting portion 30 in a state where the mounting base portion 38 is superimposed on the side surface of the claw mounting flange 21. A pair of bolt insertion holes 41 </ b> F and 41 </ b> R corresponding to is formed through.

  As shown in FIG. 5, this claw 22B has its mounting base 38 superimposed on one side surface of the claw mounting flange 21, and the bolt insertion holes 41F and 41R of the claw 22B and the second claw mounting portion 30. The claw mounting bolt insertion holes 31F and 31R are aligned with each other, the claw mounting bolts 36 are inserted into the bolt insertion holes 41F and 41R and the claw mounting bolt insertion holes 31F and 31R, and the claw mounting nuts 37 are inserted into the claw mounting bolts 36. By screwing, the claw 22B is fastened and fixed to the claw mounting flange 21.

Further, in this embodiment, a right-sided claw 22B bent toward the side frame 7 is attached to the right side surface of the left end claw mounting flange 21, and a transmission case is attached to the left side surface of the right end claw mounting flange 21. A left-handed nail 22B bent toward the 6th side is attached. Further, in the other claw mounting flange 21, one right claw 22 </ b> B and one left claw 22 </ b> B are attached to each of the left side surface and the right side surface of the claw installation flange 21.

In the rotary tiller 1 configured as described above, different types of tilling claws 22A and 22B (with the claws 22B formed as L-shaped claws 22A) are selectively applied to the pawl mounting flange 21 of one rotary tiller 1. Since it can attach, the one rotary tiller 1 can be changed into the specification according to work.
In addition, since the second claw mounting portion 30 is provided on the inner peripheral side of the claw mounting flange 21 of the first claw mounting portion 28, the mounting position of the L-shaped claw 22A and the mounting position of the leg claw 22B are easily identified. It is possible to prevent mistakes in attaching the tilling claws 22A and 22B.

Further, as shown in FIG. 1, the maximum rotation trajectory K of the L-shaped claw 22A attached to the first claw attachment portion 28 and the claw 22B attached to the second claw attachment portion 30. The first claw mounting portion 28 and the second claw mounting portion 30 are provided at a position where the maximum rotation trajectory K substantially coincides.
Therefore, the maximum rotation trajectory K of the tilling claws 22A and 22B does not change regardless of whether the L-shaped claws 22A or the elongate claws 22B are attached. The gap between the cover (main cover 24 and the like) can be made substantially the same between the case where the claw 22B is attached and the case where the L-type claw 22A is attached.

Further, in the rotary tiller 1 of the present embodiment, as shown in FIG. 2, an anti-weeding member 51 for preventing grass from being wound around the claw shaft 10 is provided.
This anti-cigarette prevention member 51 is comprised by the linear member long in the left-right direction, such as a wire and a rod (rod-shaped steel material).
The cigarette prevention member 51 of this embodiment is provided from the claw mounting flange 21 at the left and right ends to the claw mounting flange 21 at the left and right ends.

Further, as shown in FIG. 4, a fixing means 52 is provided at the end of the anti-cigarette prevention member 51. As shown in FIG. 4A, the fixing means 52 includes a male screw portion 53 provided at an end portion of the anti-winding member 51 and a nut member 54 screwed into the male screw portion 53. It is configured.
In order to attach the end portion side of the cigarette prevention member 51 to the claw attachment flange 21, unused claw attachment bolt insertion holes 29F, 29R, 31F, 31R are used. In the example shown in FIG. 4, since the L-shaped claw 22A is fixedly attached to the claw mounting flange 21, the claw mounting bolt insertion holes 31F and 31R of the second claw mounting portion 30 for mounting the claw 22B are used. . That is, the male thread portion 53 is inserted into the claw mounting bolt insertion holes 31F and 31R, and then the nut member 54 is screwed and tightened to the male screw portion 53, so that the grass winding prevention member 51 is attached to the claw mounting flange 21. It is attached. Accordingly, there is no need to separately provide an attachment portion for attaching the cigarette prevention member 51, and an effect of suppressing an increase in cost can be achieved.

  Further, the cigarette prevention member 51 can be disposed between the pair of claw attachment flanges 21 by inserting the claw attachment bolt insertion holes 29F, 29R, 31F, 31R which are not used. Has been. In the example illustrated in FIG. 4, the anti-cigarette prevention member 51 is inserted through the claw mounting bolt insertion holes 31 </ b> F and 31 </ b> R of the second claw mounting portion 30. Accordingly, there is no need to separately form a hole for inserting the cigarette prevention member 51 in the claw mounting flange 21, and an effect of suppressing an increase in cost can be achieved.

  Further, as described above, in the present embodiment, the claw mounting flanges 21 are sequentially arranged with a phase shifted by 20 ° in the claw axis rotation direction A from one side to the other in the left-right direction. Therefore, the cigarette prevention member 51 does not become parallel to the claw shaft 10 but is arranged in a spiral shape around the claw shaft 10. In addition, when forming the cigarette prevention member 51 with a rod-shaped steel material, the cigarette prevention member 51 is previously formed in a spiral shape.

Further, as shown in FIG. 4B, one fixing means 52 of the cigarette prevention member 51 is formed by an enlarged portion that is enlarged by flattening the end portion of the cigarette prevention member 51. Also good.
In the illustrated example, the cigarette prevention member 51 is constituted by one linear member extending from the claw mounting flange 21 at the left and right ends to the claw mounting flange 21 at the left and right ends, but is not limited thereto. Instead, a plurality of cigarette winding prevention members 51 may be arranged along the axis of the claw shaft 10. In other words, the cigarette prevention member 51 is disposed between a pair of claw mounting flanges 21 spaced in the axial direction of the claw shaft 10 with one or more claw mounting flanges 21 therebetween, or adjacent in the left-right direction. You may arrange | position between the nail | claw attachment flanges 21, respectively.

  When the claw 22B is attached to each claw mounting flange 21, the cigarette prevention member 51 is inserted into the claw mounting bolt that constitutes the first claw mounting portion 28 for mounting the L-shaped claw 22A. While being fixed through the holes 29F and 29R, the claw mounting bolt insertion holes 29F and 29R are inserted.

10 Claw shaft 21 Claw mounting flange 22A First tillage claw (L-type claw)
22B Second tillage nail
28 1st claw mounting portion 29F Claw mounting bolt insertion hole 29R Claw mounting bolt insertion hole 30 2nd claw mounting portion 31F Claw mounting bolt insertion hole 31R Claw mounting bolt insertion hole 36 Claw mounting bolt 51 Anti-weeding member K Maximum rotation trajectory

Claims (6)

A plurality of claw mounting flanges are provided in the direction of the claw axis on the outer periphery of the claw shaft that can be driven to rotate around the axis, and the first claw mounting portion for mounting the first tillage claw is attached to each claw mounting flange. The claw mounting flange is provided with a second claw mounting portion for mounting a second tilling claw that is different from the first tilling claw on the inner circumferential side of the claw mounting flange of the first claw mounting portion. and plurality in the circumferential direction of,
The first tillage claw and the second tillage claw are selectively fastened and fixed to a claw attachment flange via a claw attachment bolt, and the first claw attachment portion and the second claw attachment portion are claws through which the claw attachment bolt is inserted. It consists of mounting bolt insertion holes,
The claw mounting bolt insertion hole of the first claw mounting portion provided in one claw mounting flange is formed on the first circumference centered on the axis of the claw shaft,
The claw mounting bolt insertion hole of the second claw mounting portion provided on the one claw mounting flange is a second circle centered on the axis of the claw shaft and located on the inner diameter side than the first circumference. Formed on a circumference and a third circumference centered on the axis of the claw axis and located on the inner side of the second circumference,
The second tillage claw can be attached to a claw mounting bolt insertion hole located on one side in the claw axis rotation direction on the second circumference, and the other side in the claw axis rotation direction on the third circumference. A rotary tiller that can be attached to the nail attachment bolt insertion hole . A plurality of claw mounting flanges are provided in the direction of the claw axis on the outer periphery of the claw shaft that can be driven to rotate around the axis, and the first claw mounting portion for mounting the first tillage claw is attached to each claw mounting flange. The claw mounting flange is provided with a second claw mounting portion for mounting a second tilling claw that is different from the first tilling claw on the inner circumferential side of the claw mounting flange of the first claw mounting portion. and plurality in the circumferential direction of,
The first tillage claw and the second tillage claw are selectively fastened and fixed to a claw attachment flange via a claw attachment bolt, and the first claw attachment portion and the second claw attachment portion respectively penetrate the claw attachment bolt. It consists of a pair of claw mounting bolt insertion holes,
The second tillage claw is attached to one attachment portion that can be attached to one of the pair of claw attachment bolt insertion holes constituting the second claw attachment portion and the other claw attachment bolt insertion hole. A straight line perpendicular to a midpoint of a straight line connecting the one attachment part and the other attachment part in a state of being attached to the second claw attachment part. Rotary tillage device off the center . The rotary tiller according to claim 1 or 2, wherein the number of the first tilling claws attached to one of the claws mounting flanges is different from the number of the second tilling claws . The plurality of second claw mounting portions are arranged at the same pitch in the circumferential direction of the claw mounting flange,
The rotary tiller according to any one of claims 1 to 3, wherein the plurality of first claw mounting portions are arranged at a plurality of different pitches in a circumferential direction of the claw mounting flange .   The first tillage claw is attached to one side surface of the claw mounting flange,
  The rotary tiller according to any one of claims 1 to 4, wherein the second tillage claw is attached to one side surface and the other side surface of the claw mounting flange, respectively. The plurality of claw mounting flanges are sequentially arranged with a phase shifted in the claw axis rotation direction from one to the other in the claw axis direction.
A cigarette prevention member is disposed between a pair of claw mounting flanges spaced apart in the axial direction of the claw axis,
The cigarette prevention member is spirally disposed between the pair of claw mounting flanges and around the claw shaft by inserting a claw mounting bolt insertion hole that is not used by the claw mounting flange. Item 6. A rotary tiller according to any one of Items 1 to 5.

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