JP2015084738A - Structure for preventing winding of grass and straw of rotary tiller - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a structure for preventing winding of grass and straw of a rotary tiller which can prevent a long-culm such as grass and straw from being wound around a cultivating shaft without installing a linear member.SOLUTION: The rotary tiller includes a plurality of cultivating claw mounting bodies that are mounted to an outer periphery of the cultivating shaft so as to be protruded while separating apart from each other in the axial direction thereof, where a base end part of a cultivating claw is mounted to each cultivating claw mounting body. In the rotary tiller, a tubular grass and straw winding prevention body is disposed between the cultivating claw mounting bodies adjacent to each other in the axial direction of the cultivating shaft so as to be concentric with the cultivating shaft, and the outer periphery of the cultivating shaft is covered by the grass and straw winding prevention body.

Description

  The present invention relates to a grass wrapping prevention structure for a rotary tiller.

  Conventionally, as one form of a rotary tiller, a plurality of tilling nail attachments are attached to the outer peripheral surface of the tilling shaft in a protruding manner at intervals in the axial direction, and the base end of the tilling nail is attached to each tilling nail attachment. There is one in which a linear member having the same length as that of the tilling shaft is horizontally mounted between the tilling claw attaching bodies positioned on both outermost sides through attachment stays (see Patent Document 1).

  With the rotary tiller described above, when plowing weeds and plowing after harvesting rice, the linear member prevents the grass and cocoon from being wound around the tiller shaft, and the rotation of the tiller shaft is prevented. The increase in dynamic resistance is suppressed.

4-110402

  However, in the above-described rotary tiller, the long rod may be wound directly around the linear member, which may cause the rotation resistance of the tillage shaft to increase, resulting in a decrease in tillage efficiency. Further, the linear member has a problem that stress concentration occurs at both ends of the connection supported, and the connection portion is easily damaged, and is easily damaged when it collides with a stone or the like in the field. Have the problem.

  SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a structure for preventing the cultivating of a rotary tiller of a rotary tiller that can prevent the grass and cocoon from being wound around the tilling shaft without providing a linear member.

  According to the first aspect of the present invention, a plurality of tilling claw attachments are attached to the outer peripheral surface of the tilling shaft in a protruding manner at intervals in the axial direction, and the base end portion of the tilling claw is attached to each cultivation claw attachment. A rotary tiller, and a cylindrical weed winding preventive body is arranged concentrically with the tilling shaft between adjacent tilling claw attachment bodies in the axial direction of the tilling shaft. The outer peripheral surface of the tillage shaft is covered.

  Invention of Claim 2 is invention of Claim 1, Comprising: A cylindrical grass wrapping prevention body is each mounting bolt which attaches the base end part of each tilling nail to each tilling nail attachment body to the internal diameter Each mounting bolt is covered from the outside by a weed winding prevention body which is larger in diameter than the mounting position and is arranged concentrically with the tilling shaft.

  Invention of Claim 3 is invention of Claim 1 or 2, Comprising: A grass wrapping prevention body is a pair of winding prevention piece formed in the shape of a semicircular arc, and the both-ends edge part of each winding prevention piece And connecting portions of the anti-winding pieces to each other to form a cylindrical shape, and the connected connecting portions are recessed inward from the outer peripheral surface of the anti-winding piece. It is characterized by being arranged.

  Invention of Claim 4 is invention of any one of Claims 1-3, Comprising: The peripheral part of a grass wrapping prevention body is between the cultivation nail attachment bodies adjacent to the circumferential direction of a cultivation shaft. The part located is extended to the peripheral edge side of the weed winding preventing body adjacent in the axial direction of the tilling shaft to form an extending peripheral edge, and the adjacent extending peripheral edges are in the radial direction of the tilling shaft. It is characterized by being in a polymerized state.

  Invention of Claim 5 is invention of any one of Claims 1-4, Comprising: A filler is provided between the inner peripheral surface of a weed winding prevention body, and the outer peripheral surface of a tilling shaft. It is characterized by being filled.

  According to the present invention, the cylindrical weed winding preventing body is disposed between the tilling claw attachment bodies adjacent in the axial direction of the tilling shaft, and the outer peripheral surface of the tilling shaft is covered with the weed winding preventing body. Thus, it is possible to steadily prevent the tiller shaft from being wrapped with grass or a long rod of straw, and to prevent the rotation resistance of the tiller shaft from increasing. Therefore, it is possible to ensure a good depth of penetration. As a result, it is possible to ensure good tillage efficiency.

The side view of the rotary tiller which concerns on this embodiment, and the tractor which pulls it. Side surface explanatory drawing of a rotary tillage apparatus. Front explanatory drawing of a rotary tillage device. The II sectional view taken on the line of FIG. II-II sectional view taken on the line of FIG. Exploded perspective view of the grass wrapping prevention body. Explanatory drawing of a development of a grass wrapping prevention body. Sectional drawing of the attachment state of the Kusanagi winding prevention body as other embodiment. The perspective explanatory drawing of the weed winding prevention object as other embodiments.

  Embodiments of the present invention will be described below with reference to the drawings. 1 is a rotary tiller according to the present invention, B is a tractor that pulls the rotary tiller A, and C is a three-point link mechanism that connects the tractor B and the rotary tiller A. The tractor B is connected to the rotary tiller A through a three-point link mechanism C so as to be movable up and down, and can travel while pulling the rotary tiller A.

  Next, the configuration of the rotary tiller A, the tractor B, and the three-point link mechanism C will be described in this order.

[Description of Rotary Tiller A]
As shown in FIGS. 1 to 3, the rotary tiller A is directed to the left and right side walls of a sheet metal gear box 10 containing input / output transmission gears (not shown) that mesh with each other, and the axis is directed in the left-right direction. The inner end portions of the cylindrical left and right main beams 11 and 12 are connected in communication. The upper end of the vertically long transmission case 13 is connected to the outer end of the left main beam 11 in the vertical direction, while the upper end of the vertically long bearing member 14 is connected to the outer end of the right main beam 12 in the vertical direction. Then, between the lower end portion of the transmission case 13 and the lower end portion of the bearing body 14, a tilling shaft 15 having an axis line in the left-right direction is pivoted in a horizontal manner so as to be rotatable around the axis line. Then, an input shaft 17 having an axial line extending in the front-rear direction is projected from an opening 16 opened in the front wall of the gear box 10, and an input transmission gear disposed in the gear box 10 is interlocked and connected to the input shaft 17. Yes. In the left main beam 11, a transmission shaft 18 having an axis line in the left-right direction is mounted, and an output transmission gear is interlocked and connected to an inner end portion (right end portion) of the transmission shaft 18. The transmission shaft 18 and the input shaft 17 are interlocked to each other. The left end portion of the tillage shaft 15 is linked to the outer end portion (left end portion) of the transmission shaft 18 via a chain mechanism (not shown) provided in the transmission case 13. A large number of tilling claws 22 are attached to the peripheral surface of the tilling shaft 15 at intervals in the axial direction and shifted in the circumferential direction.

  Between the upper part of the transmission case 13 and the upper part of the bearing body 14, a rotary cover 23 formed in an arc shape so as to cover the upper side of the tilling shaft 15 is stretched. The upper end edge (base end edge) of the rear cover 24 is pivotally connected to the rear end edge of the rotary cover 23, and the lower end edge (front end edge) of the rear cover 24 is slid on the field to make tillage. The uneven farm field plowed by the claws 22 is leveled by the rear cover 24.

  Between the rotary cover 23 and the rear cover 24, a pair of left and right hanger rods 25, 25 having an axis line in the vertical direction are interposed, and the rear cover 24 is connected to both the hanger rods 25, 25 via the compression springs 26, 26. Is elastically supported. The compression spring 26 suppresses the rear cover body 19 from rotating suddenly downward by compressing (pressing elastically urging) the rear cover 24 when the rotary tiller A is raised. The rear cover 24 is prevented from interfering with the tilling claw 22. Reference numeral 27 denotes an upper stay that supports the upper part of the hanger rod 25, and 28 denotes a lower stay that supports the lower part of the hanger rod 25. A side cover 29 closes the side of the rear cover 24.

  The lower wall of a pair of left and right top link connecting brackets 30, 30 extending upward and forward is pivotally connected to the upper wall of the gear box 10 via a pivot 31 having an axis line in the left-right direction. . Between the upper portions of the top link connecting brackets 30, 30, an upper connecting pin 32 having an axis line in the left-right direction is laid in a penetrating manner.

  A rear end portion (base end portion) of a pair of left and right lower link coupling brackets 33, 33 extending toward the front lower side is attached to the inner side portion of the left main beam 11, and the front end portions of the lower link coupling brackets 33, 33 ( A lower link connecting pin 34 having an axis line in the left-right direction is laid across the front end portion in a penetrating manner. At the rear of the lower link connecting brackets 33, 33, a connecting pin 35 having an axis lined in the left-right direction is horizontally installed so as to penetrate between the inner lower link connecting bracket 33 and the left top link connecting bracket 30. A reinforcing bracket 36 extending in the vertical direction is provided via the connecting pin 35 and the top link connecting pin 32.

  A rear end portion (base end portion) of a pair of left and right lower link connecting brackets 40, 40 extending toward the front lower side is attached to the inner side portion of the right main beam 12, and the front end portions of the lower link connecting brackets 40, 40 ( A lower link connecting pin 41 having an axis line in the left-right direction is horizontally laid across the tip portion. At the rear part of the lower link connecting brackets 40, 40, a connecting pin 42 having an axis line in the left-right direction is horizontally mounted so as to penetrate between the inner lower link connecting bracket 40 and the right top link connecting bracket 30. A reinforcing bracket 43 extending in the vertical direction is provided via the connecting pin 42 and the top link connecting pin 32.

  Between the left lower link connecting brackets 33, 33 and the right lower link connecting brackets 40, 40, a connecting rod 44 with its axis lined in the left-right direction is horizontally laid in a penetrating manner to connect the left and right lower link connecting brackets. The brackets 33, 33, 40, and 40 are reinforced.

  As shown in FIGS. 3 to 5, the tilling shaft 15 is provided with a plurality of (four in this embodiment) tilling nail attachment bodies 51 formed in a flat cylindrical shape on the same circumference in the circumferential direction. And projecting in the radial direction at intervals. A plurality of tilling claw attachment bodies 51 projecting on the same circumference are regarded as one unit, and a large number of units are provided at intervals in the axial direction of the tilling shaft 15. In addition, the units adjacent in the left-right direction are arranged so as to be slightly displaced in the circumferential direction sequentially from one end of the tillage shaft 15 to the other end. The tilling claw attachments 51 adjacent in the left-right direction are arranged on the same virtual spiral line on the peripheral surface of the tilling shaft 15. That is, in the present embodiment, a large number of tilling claw attachments 51 are arranged at intervals in the axial direction of the tilling shaft 15 on four virtual spiral lines.

  Bolt holes (not shown) formed in the base end portion of the tilling nail 22 by inserting the base end portion of the single tilling nail 22 from the protruding end portion (tip end portion) 51 a into each tilling nail attachment body 51. And a bolt insertion hole (not shown) formed in the side wall of each tilling claw attachment body 51, and by inserting a mounting bolt 52a into both the aligned holes and fastening a nut 52b, The tilling claws 22 are attached to the nail attachment bodies 51, respectively.

  In the rotary tiller A configured as described above, the cylindrical weed winding preventing body 50 is concentrically with the tilling shaft 15 between the tilling claw mounting bodies 51 and 51 adjacent to each other in the axial direction of the tilling shaft 15. It arrange | positions and the outer peripheral surface of the tilling axis | shaft 15 is coat | covered by the weed winding prevention body 50. FIG. The present embodiment is characterized by the configuration of the weed winding preventing body 50 attached to the tilling shaft 15, and the configuration of this weed winding preventing body 50 will be described below with reference to FIGS. I will explain in detail.

  That is, the grass wrapping preventing body 50 is formed in a cylindrical shape, and its inner diameter is larger than the mounting positions of the mounting bolts 52a and nuts 52b for mounting the base end portions of the tilling claws 22 to the tilling pawl mounting bodies 51. The mounting bolts 52a and the nuts 52b have a large diameter so that they are covered from the outside by the weed winding preventing body 50 arranged concentrically with the tilling shaft 15. In other words, the mounting bolts and nuts 52a and 52b are covered with the grass wrapping preventing body 50 from the outside so as not to be exposed, so that the heads of the mounting bolts and the nuts 52a and 52b serving as the protrusions are It is made not to cause winding of the stems left in the field at the time of tillage work. Here, the grass wrapping prevention body 50 formed in a cylindrical shape has an outer diameter so that the circumference thereof is larger than the length of the stalks left in the field during the plowing work, The kite is prevented from being wound around the outer circumferential surface of the weed winding prevention body 50. For example, when it is assumed that the length of the stem is 40 to 50 cm, the perimeter of the grass wrapping preventing body 50 is formed to be 50 cm or more.

  As shown in FIGS. 6 and 7, the grass wrapping preventing body 50 is formed into a cylindrical shape by connecting opposite ends of a pair of winding preventing pieces 53, 53 formed in a semi-cylindrical shape. . The winding prevention piece 53 is formed so that the width in the axial direction thereof is substantially the same as the interval W1 between the tilling nail attachment bodies 51, 51 adjacent to each other in the axial direction (left-right direction) of the tilling shaft 15. One-side end portions 53a and 53a formed by bending in a "V" shape in a side view are provided at one side edge portions of the anti-winding pieces 53 and 53 formed in a semicircular arc shape. On the other side edge of the pieces 53, 53, other side connection parts 53b, 53b formed to protrude inward are provided. And the inner surface of the front end surface part of the one side connection part 53a of the other anti-winding piece 53 is brought into contact with the outer surface of the other side connection part 53b of the one anti-winding piece 53 in a superposed state, and each connection part 53a, The bolt holes 53 c and 53 d formed in the 53 b are aligned, and the connection bolt 55 is inserted into the bolt holes 53 c and 53 d to be aligned and fastened to the nut 56. The nut 56 is continuously provided in alignment with the bolt hole 53d on the inner surface of the other side connection portion 53b. Further, the inner surface of the front end surface portion of the one side connection portion 53a of the one anti-winding piece 53 is brought into contact with the outer surface of the other side connection portion 53b of the other anti-winding piece 53 in a superposed state. The bolt holes 53 c and 53 d formed in the 53 b are aligned, and the connection bolt 55 is inserted into the bolt holes 53 c and 53 d to be aligned and fastened to the nut 56. Here, each connected connection part 53a, 53b is arrange | positioned inside the outer peripheral surface of the anti-winding piece 53 so that it may be depressed inside, and in these outwards, it is the left-right direction (grass winding anti-winding body 50). A groove 57 having a cross-section “V” shape extending in the direction of the axial line) is formed. The heads of the connecting bolts 55 that are connected by fastening the connecting portions 53a and 53b are accommodated in the concave groove 57 so as not to protrude from the outer peripheral surface of the winding preventing piece 53. That is, the head of the connection bolt 55 is prevented from winding the stem that is left in the field during the plowing operation.

  As for the peripheral part of the right and left sides of each winding prevention piece 53, the part located between the tilling nail attachment bodies 51 and 51 adjacent to the circumferential direction of the tilling shaft 15 is each winding prevention piece adjacent to the axial direction of the tilling shaft 15. The peripheral edge portions 53e and 53e are extended to the peripheral edge side of 53, respectively. The extended peripheral edge portions 53e and 53e adjacent to each other in the axial direction of the tilling shaft 15 are arranged in a superposed state in the radial direction of the tilling shaft 15 (inner and outer peripheral surfaces). The extending width W3 of each extending peripheral edge 53e is formed to be slightly wider than the short sub-width W2 of the tilling claw attachment 51 formed in the axial direction of the tilling shaft 15.

  The extending peripheral edge portions 53e and 53e of the anti-winding pieces 53 and 53 formed in this way have the inner and outer peripheral surfaces in a superposed state between the tilling claw attachment bodies 51 and 51 adjacent in the circumferential direction of the tilling shaft 15. Since the extended peripheral edge portions 53e and 53e are reinforced with each other and the bonded portion is strengthened, the extended peripheral edge portions 53e and 53e are arranged between the tilling claw attachment bodies 51 and 51 adjacent in the circumferential direction. The anti-winding body 50 is positioned. That is, when the weed winding preventing body 50 is moved in the circumferential direction of the tilling shaft 15, the extending peripheral edge portions 53 e and 53 e are engaged with the tilling claw attaching body 51. Is restricted from moving in the circumferential direction.

  Both winding prevention pieces 53 and 53 are formed in a flat plate shape by a flexible material, and one side connection portion 53 a of one winding prevention piece 53 and the other side of the other winding prevention piece 53. While connecting the connection part 53b, both winding prevention pieces 53 and 53 are bent around the tilling shaft 15, and the other connection part 53b of one winding prevention piece 53 and the other winding prevention piece 53 are bent. By connecting with the one side connection part 53a, it can also be set as the Kusanagi winding prevention body 50, and can be assembled | attached.

  By configuring in this way and connecting the connection portions 53a and 53b of the anti-winding pieces 53 around the tilling shaft 15 by fastening the connection bolt 55 and the nut 56, the cylindrical grass weed The winding preventing body 50 can be assembled around the tilling shaft 15 that is pivoted on the rotary tilling device A. Then, the required number of grass winding wrap prevention bodies 50 are successively assembled in the axial direction around the tilling shaft 15, and the entire outer periphery of the tilling shaft 15 is covered by the required number of grass winding wrap prevention bodies 50. can do. At this time, the extended peripheral edge portions 53e and 53e of the anti-winding pieces 53 and 53 forming the weed winding prevention body 50 are between the tilling claw attachment bodies 51 and 51 adjacent to each other in the circumferential direction of the tilling shaft 15. By arranging so that the inner and outer peripheral surfaces are joined in a superposed state, the extended peripheral edge portions 53e and 53e are mutually reinforced, and the penetration of tillage soil or the like into the grass wrapping prevention body 50 is suppressed. Furthermore, the heads of the connection bolts 55 that connect the connection portions 53a and 53b of the anti-winding pieces 53 are accommodated in the concave groove 57, thereby preventing the stem rod from being wound around the tilling shaft 15. can do.

  FIG.8 and FIG.9 has shown the Kusanagi winding prevention body 50 as a modification. That is, the grass wrapping preventing body 50 is filled with a light filler 54 such as sponge or foaming agent between the inner peripheral surface and the outer peripheral surface of the tilling shaft 15. In the present embodiment, a filler 54 formed in a thick semi-cylindrical shape is attached to the inner peripheral surface of each winding preventing piece 53. Here, the thickness of the filler 54 is formed to be substantially the same as the interval between the inner peripheral surface of the assembled weed winding preventing body 50 and the outer peripheral surface of the tilling shaft 15. And a pair of winding prevention pieces 53 and 53 with which the filler 54 was adhered are connected so that the tilling axis | shaft 15 may be pinched | interposed, and the grass winding anti-winding body 50 is assembled | attached, and the grass winding anti-winding body 50 of FIG. A filler 54 is disposed between the inner peripheral surface and the outer peripheral surface of the tilling shaft 15 in a filled state. Since the grass wrapping prevention body 50 formed in this way is filled with the filler 54, cultivated soil or the like that becomes a rotational load of the cultivating shaft 15 enters the grass wrapping prevention body 50. It is possible to prevent the trouble of doing.

  In the present embodiment, both end portions of the pair of anti-winding pieces 53, 53 are fastened by the connecting bolt 55 and the nut 56, but one end portion is pivotally connected to the other side. It is also possible to connect only the end portion by fastening with the connection bolt 55 and the nut 56. At this time, the pivot connecting portion is disposed inward of the outer peripheral surface of the winding preventing pieces 53 and 53, thereby preventing the stems from being wound. In addition, since both the connecting portions of the pair of anti-winding pieces 53 and 53 are fitted connection portions, both end portions of the pair of anti-winding pieces 53 and 53 can be connected with a single touch. And the grass wrapping prevention body 50 can also be assembled | attached quickly.

[Description of Tractor B]
As shown in FIG. 1, the tractor B has a traveling machine body 102 supported by a pair of left and right front wheels 100, 100 and a pair of left and right rear wheels 101, 101. The traveling machine body 102 has an engine 104 mounted on an engine support machine frame 103, a front end portion of a cylindrical clutch housing 105 extending in the front-rear direction is connected to a rear end portion of the engine 104, and a rear end of the clutch housing 105. The transmission case 106 is connected to the part. The engine support machine frame 103 is supported by a pair of left and right front wheels 100 and 100 via a cylindrical front axle case 107 extending in the left-right direction. The transmission case 106 is supported by a pair of left and right rear wheels 101 and 101 via rear axle cases 108 and 108 projecting outward from the left and right side walls. Reference numeral 109 denotes a front axle that is pivoted in the front axle case 107 and interlocked with the front wheels 100 and 100. Reference numeral 110 denotes a rear axle that is axially mounted in the rear axle cases 108 and 108 and interlocked with the rear wheels 101 and 101. Reference numeral 111 denotes a bonnet that covers the engine 104 so that it can be freely opened and closed.

  An operating unit 112 is disposed on the clutch housing 105 and the transmission case 106. The driver 112 is provided with a dashboard 113 behind the engine 104, a handle 114 is attached to the dashboard 113, and a seat 115 is disposed behind the handle 114. A hydraulic lift case 116 is mounted on the mission case 106, and a pair of left and right lift arms 117 are disposed on the left and right side walls of the hydraulic lift case 116 via lift arm rotation support shafts 118 with the axis line directed in the left-right direction. The lift arms 117 and 117 can be moved up and down by protruding the rear 117 upward. 119 is a connecting piece provided on the rear wall of the hydraulic elevating case 116, 120 is a fuel tank disposed on the transmission case 106, and 121 is a portal-type lops frame erected between the rear axle cases 108 and 108. . Reference numeral 122 denotes a PTO shaft that protrudes rearward from the rear wall of the transmission case 106. The gear box 10 provided in the rotary tiller A is interlocked with the PTO shaft 122 via the drive shaft 123, and is connected to the rotary tiller A. The power for tillage is transmitted.

[Description of three-point link mechanism C]
As shown in FIG. 1, the three-point link mechanism C includes a top link 130 and a pair of left and right lower links 131 and 131 having an axis line in the front-rear direction, and a pair of left and right lift links 132 and 132 having an axis line in the vertical direction. It has.

  The top link 130 connects the front end portion to the connecting piece 119 of the tractor B, while the upper link pin (top link connection pin) is between the upper end portions of the top link connection brackets 30 and 30 provided in the rotary tiller A. The rear end portion is connected via 32. The pair of left and right lower links 131 and 131 are connected to the pair of left and right lower link connecting brackets 33 and 33 provided on the rotary tiller A while the front end portions are connected to the lower portions of the left and right side walls of the transmission case 106 provided on the tractor B. The rear end portions are connected via connecting pins 134 and 134.

A Rotary plowing device B Tractor C Three-point link mechanism 15 Tilling shaft 22 Tillage claw 50 Grass wrapping prevention body 51 Tillage claw attachment body 53 Winding prevention piece 53a One side connection part 53b Other side connection part 53e Extension peripheral part 54 Filler

Claims (5)

A rotary cultivating apparatus in which a plurality of cultivating claw attachments are attached to the outer peripheral surface of the cultivating shaft with an interval in the axial direction, and a base end portion of the cultivating claw is attached to each cultivating claw attachment,
A cylindrical weed winding preventive body is arranged concentrically with the tilling shaft between the tilling claw attachment bodies adjacent to the axial direction of the tilling shaft, and the outer surface of the tilling shaft is covered with the weed winding preventing body. A structure for preventing winding of a rotary tiller of the rotary tiller. The cylindrical grass wrapping prevention body has an inner diameter larger than the mounting position of each mounting bolt for mounting the base end of each tilling nail to each tilling nail mounting body,
2. The structure for preventing the weed winding of a rotary tilling device according to claim 1, wherein each mounting bolt is covered from the outside by a weed winding preventing body arranged concentrically with the tilling shaft. The Kusanagi anti-winding body includes a pair of anti-winding pieces formed in a semicircular arc shape, and connection portions formed at both ends of each anti-winding piece, and the connection portions of the anti-winding pieces are connected to each other. By connecting, cylindrical and without,
3. The grass wrapping prevention structure for a rotary tiller according to claim 1 or 2, wherein the connected connecting portions are arranged in a recessed shape inward from the outer peripheral surface of the winding prevention piece. The peripheral edge of the grass wrapping prevention body extends a portion located between the cultivating claw attachments adjacent in the circumferential direction of the tillage shaft to the peripheral edge side of the grass wrapping prevention body adjacent in the axial direction of the tillage shaft. Let it out and without the peripheral edge,
Adjacent extending peripheral edges are in a superposed state in the radial direction of the tilling shaft, and the weed winding preventing structure for a rotary tilling device according to any one of claims 1 to 3. The rotary tiller according to any one of claims 1 to 4, wherein a filler is filled between the inner peripheral surface of the grass wrapping preventing body and the outer peripheral surface of the tilling shaft. Kusanagi winding prevention structure.

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