JP2013223452A - Tilling rotary structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a tilling rotary structure securing sufficient mounting strength, facilitating mounting/changing work and variably adjustable in soil digging width.SOLUTION: Brackets 21A, 21B of a tilling rotary structure include a boss mounted to a rotationally driven tilling shaft 17 of a tiller so as to rotate integrally with the tilling shaft, and mounting plates of flat plate shape having projecting pieces radially projected from the outer periphery of the boss. Claw rotors 22A, 23A, 23B have rotor faces of flat plate shape having openings that can axially insert the whole brackets including the projecting pieces, and claws 24A, 24B radially projected from the rotor faces. The claw rotors are fixed to the brackets in relative rotating angle positions where the brackets cannot be inserted. The claw rotors can be fixed on either the inside or outside of the mounting plates of the brackets.

Description

  The present invention relates to a tillage rotary structure that is attached to a tiller and used for tilling soil such as a field.

  Generally, a power tiller is connected to a drive shaft that is rotationally driven by a drive source such as an installed engine, and a drive transmission means such as a gear is connected to rotate a pair of tiller shafts on the left and right of the rotary unit in a predetermined direction at a predetermined speed. Then, the soil such as the field is cultivated with the cultivating claws attached to the cultivating shaft via the attaching member (Patent Documents 1, 2, etc.). As a tilling nail, what is called a nail | claw is used abundantly, and this is attached to a tilling axis | shaft at equiangular intervals, and is used (patent document 1, 2 etc.).

  The nail-shaped tillage nail is suitable when the soil is soft, but has a high resistance to biting into hard soil. In particular, if pebbles and so on are mixed in the soil, if the claw rides on the stone, the tiller shaft stops, giving an excessive load to the engine and drive transmission means, etc. The work efficiency was reduced, and in some cases, a rollover accident could occur.

  In order to solve these problems, in Patent Document 3, a first claw portion that is bent at an obtuse angle in one direction from a flat substrate and has an outer peripheral edge formed in an arc shape, and an obtuse angle at an opposite direction is bent and It has been proposed to use a pair of nail portions alternately arranged with arcuate outer peripheries as a tilling nail and attach it to each of the left and right tilling shafts in pairs. By using the tilling claws of such a shape, even hard soil can be efficiently cultivated, and the effect of being able to work while maintaining a stable posture even in soil mixed with pebbles etc. It is described that it is obtained.

JP 2011-217654 A JP 2012-010632 A JP 2012-005445 A

  In these prior arts, as a structure for attaching a tilling claw to a tilling shaft, a structure in which a base end portion of a nail claw is fitted into a cylindrical holder radially projected on the outer periphery of the tilling shaft and bolted (Patent Document 1, 2) and a structure (Patent Document 3) in which the tilling claw is bolted to a disc-shaped mounting flange that is integral with the tilling shaft, etc. are adopted, but the load applied when the tilling nail bites into the soil The holder or the mounting flange may be damaged, or the bolt may be broken and the tilling claws may fly off, resulting in insufficient mounting strength.

  Therefore, the present invention can secure sufficient mounting strength when mounting the tilling claw to the tilling shaft and can easily perform operations such as mounting and exchanging, and also diversify the excavation width formed by tilling the soil. It is an object to provide a novel tillage rotary structure that can be adjusted.

  The present invention has been completed as a result of repeated studies and experiments over a long period of time in order to solve this problem. That is, the present invention according to claim 1 is a tillage rotary structure connected to a tiller, and includes a bracket and a claw rotor, and the bracket rotates integrally with a tiller shaft that is rotationally driven by the tiller. A boss mounted on the tillage shaft and a flat mounting plate having projecting pieces projecting radially from the outer periphery of the boss, and the claw rotor can be inserted through the entire bracket including the projecting piece in the axial direction. It has a flat rotor surface with an opening and a claw projecting radially from the rotor surface, and the claw rotor is fixed to the bracket at a relative rotational angle position at which the bracket cannot be inserted.

  According to a second aspect of the present invention, in the tillage rotary structure according to the first aspect, the claw rotor is disposed on either the inside or the outside of the bracket.

  According to a third aspect of the present invention, in the tillage rotary structure according to the first or second aspect, the mounting plate of the bracket includes a disk-shaped main portion concentric with the boss and larger in diameter than the boss, and the disk-shaped main portion. The protrusions projecting radially at equal angular intervals, and the opening of the claw rotor includes a central opening through which the disc-shaped main portion of the mounting plate can be inserted, a protruding piece of the mounting plate of the bracket, and the claw rotor. The extension opening portion can be inserted through the protruding piece of the mounting plate at a relative rotation angle position where the extension opening portion is aligned in the axial direction, and the protruding piece and the extension opening portion are not aligned in the axial direction. The claw rotor is fixed to the bracket at a general rotational angle position.

  According to a fourth aspect of the present invention, in the tillage rotary structure according to the third aspect, a predetermined number of bolt insertion holes are respectively formed on the protruding piece of the mounting plate of the bracket and the rotor surface of the claw rotor. The bracket mounting plate protruding piece and the claw rotor extended opening are formed in a position aligned in the axial direction when the relative rotation angle position is not aligned in the axial direction. It is characterized by comprising a bolt inserted into a bolt insertion hole at a position aligned in the axial direction, and a nut screwed into the bolt.

  According to a fifth aspect of the present invention, in the tillage rotary structure according to any one of the first to fourth aspects, the claw of the claw rotor is opposite to the first claw surface directed in one direction from the rotor surface and the first claw surface. It consists of a second nail surface protruding in the direction, and is characterized in that the soil is dug up by a scoop surface formed by the first nail surface and the second nail surface.

  According to a sixth aspect of the present invention, in the tillage rotary structure according to any one of the first to fifth aspects, two mounting plates are fixed to the bosses of the bracket at an interval in the axial direction, and each of the mounting plates has a claw. The rotor is fixed.

  According to a seventh aspect of the present invention, in the tillage rotary structure according to any one of the first to fifth aspects, the set of two mounting plates provided on the boss of the bracket at intervals in the axial direction is provided in each group. A plurality of sets are fixed to each other with an interval in the axial direction, and a claw rotor is fixed to each mounting plate.

  According to an eighth aspect of the present invention, in the tillage rotary structure according to the sixth or seventh aspect, the claw rotor is fixed to the two attachment plates so that the claws face each other.

  According to a ninth aspect of the present invention, in the tillage rotary structure according to the sixth or seventh aspect, the claw rotor is fixed to the two mounting plates with the claw in the same direction.

  According to a tenth aspect of the present invention, in the tillage rotary structure according to any one of the first to ninth aspects, the claw of the claw rotor is opposite to the first claw surface directed in one direction from the rotor surface and the first claw surface. It consists of a second nail surface protruding in the direction, and is characterized in that the soil is dug up by a scoop surface formed by the first nail surface and the second nail surface.

  According to the present invention, the claw rotor has a flat rotor surface having an opening through which the entire bracket including the projecting piece can be inserted in the axial direction. Therefore, after the bracket is mounted on the tillage shaft, The claw rotor can be fixed to the bracket by inserting the claw rotor into the inside of the bracket so that the bracket is inserted. Therefore, since the rotor surface of the claw rotor and the mounting plate of the bracket are fixed in close contact with each other, the mounting strength can be sufficiently secured and a mounting structure that does not cause breakage can be provided.

  Further, the claw rotor can be fixed outside the bracket, and the excavation width formed by tilling the soil can be changed by changing the mounting position of the claw rotor. Also, the claw rotor can be easily replaced. Further, an embodiment in which two mounting plates are fixed to the boss of the bracket with an interval in the axial direction, or a set of two mounting plates provided with an interval in the axial direction between each set. In an embodiment in which a plurality of sets are fixed at intervals in the axial direction, when fixing the claw rotor to the two mounting plates, the claw may be fixed so that they face each other, or the claw is fixed in the same direction. You may do it. By combining these singly or arbitrarily, the cutting width can be adjusted in various ways, and optimum use according to soil, crops, and the like is possible.

It is a side view which shows an example of the tiller which can apply the tilling rotary structure by this invention. It is a perspective view which shows the connection part which connected the tilling rotary structure by one Embodiment of this invention with the tiller of FIG. It is the front view (a) of the bracket used for the tilling rotary structure of FIG. 2, a top view (b), and a side view (c). It is AA sectional drawing of this bracket. It is a perspective view of this bracket. It is a top view of the nail | claw rotor used for the tilling rotary structure of FIG. It is a side view of this nail | claw rotor. It is a perspective view of this nail | claw rotor. It is action | operation explanatory drawing of the tilling rotary structure of FIG. FIG. It is a figure which shows an example of the groove | channel and embankment shape obtained as a result of performing soil excavation using the tillage rotary structure of FIG. It is a perspective view which shows the tillage machine with which the tilling rotary structure by another embodiment of this invention was mounted | worn. It is a figure which shows an example of the groove | channel and embankment shape obtained as a result of performing soil excavation using the tillage rotary structure of FIG. It is a perspective view which shows the cultivator with which the rotary rotary structure by another embodiment of this invention was mounted | worn. It is a figure which shows an example of the groove | channel and embankment shape obtained as a result of performing soil excavation using the tilling rotary structure of FIG.

  FIG. 1 shows an example of a cultivator to which a cultivating rotary structure according to the present invention can be applied. This cultivator 10 is shown as a hand-held cultivator in which an engine 13 is mounted on a frame 12 provided with a handle 11 at the rear, and cultivates while traveling in the direction A with a pair of left and right wheels 14. The wheel 14 is shown as a driving wheel that is rotationally driven in the direction B by the driving force of the engine 13, but in the case of a small cultivator, it may be a wheel that rotates freely without being driven. A tillage rotary structure 20 according to the present invention is connected to the front of the frame 12, and a cover 15 is attached to prevent the soil splashed upward from falling down.

  The drive shaft of the engine 13 is connected to the tillage shaft 17 via a drive transmission mechanism (not shown) made of gears or the like, so that the tillage shaft 17 is rotationally driven in the C direction at a predetermined speed. The tillage rotary structure 20 of the present invention is connected. That is, the tilling rotary structure 20 of the present invention includes claw rotors 22 and 23 having a plurality of tilling claws and a bracket 21 that attaches the claw rotor to the tilling shaft 17 in a replaceable manner. The tilling rotary structure 20 is connected to the tiller 10 via a tilt mechanism (not shown), and the mounting angle is changed by an operating means such as a lever, whereby the claws of the tilling rotary structure 20 bite into the soil. The depth can be adjusted. Alternatively, in the cultivator 10 in which a wheel is also provided in front of the tillage rotary structure 20, a structure may be adopted in which a tilt mechanism is provided on the wheel to adjust the biting depth of the claw.

  The tilling rotary structure 20 of the present invention will be described in detail with reference to examples.

  With reference to FIG. 2, the tilling rotary structure 20 by Example 1 is demonstrated. In this tillage rotary structure 20, tillage shafts 17 project horizontally on both sides of a chain case 16 provided in the center (in which a chain constituting a drive transmission mechanism is housed), and a bracket 21A is provided on one side thereof. The two claw rotors 22A and 22B are attached via the bracket, and the two claw rotors 23A and 23B are attached via the bracket 21B to the other side. The brackets 21A and 21B have the same shape and structure. Hereinafter, the brackets 21A and 21B are collectively referred to as the bracket 21 when it is not necessary to distinguish them. The claw rotors 22A and 22B have the same shape, the claw rotors 23A and 23B have the same shape, and the claw rotors 22A and 22B and the claw rotors 23A and 23B have symmetrical shapes with respect to the center O and the rotor surface. Hereinafter, when it is not necessary to distinguish the claw rotors 22A and 22B, they are collectively referred to as claw rotors 22, and when it is not necessary to distinguish the claw rotors 23A and 23B, they are collectively referred to as claw rotors 23. The claw rotors 22A and 22B are attached in the same direction in which the three claws 24A and 24B face outward, and similarly the claw rotors 23A and 23B are attached in the same direction in which the three claws 25A and 25B face outward. Yes. Hereinafter, when it is not necessary to distinguish the claws 24A and 24B, they are collectively referred to as claws 24. Similarly, when it is not necessary to distinguish the claws 25A and 25B, they are collectively referred to as claws 25.

  Next, the bracket 21 will be described with reference to FIGS. The bracket 21 includes a boss 26 that is inserted through the tillage shaft 17 so as not to be relatively rotatable, and a mounting plate 27 that is fixed to the outer periphery of the boss 26 by welding or the like. In this embodiment, two mounting plates 27A and 27B having the same shape are welded concentrically to the outer periphery of the boss 26 at a position where their mounting angles are displaced by 60 degrees with an interval in the axial direction. Each mounting plate 27A, 27B has three projecting pieces 28A, 28B projecting radially at intervals of 120 degrees. Therefore, when viewed from the front, the protruding pieces 28A and 28B of the two mounting plates 27A and 27B appear to be alternately arranged at intervals of 60 degrees (FIG. 3A). Bolt insertion holes 29A and 29B are opened in the protruding pieces 28A and 28B.

  Since the tillage rotary structure 20 of this embodiment is designed to be attached to the tillage shaft 17 formed as a spline shaft, the inner diameter of the boss 26 also has a spline shape 30 corresponding thereto. Between the mounting plates 27A and 27B, a screw hole 31 that penetrates the thickness of the boss 26 and reaches the inner diameter 30 is provided. Reinforcing ribs 41 are formed over a predetermined area in the portion where the screw hole 31 is provided.

  Next, the claw rotor 22 (22A, 22B) will be described with reference to FIGS. The claw rotor 22 is made of a single material having excellent strength and wear resistance (for example, Swedish steel), and a flat rotor surface 32 having a hexagonal shape in plan view and three pieces of the rotor surface 32 are folded. The first nail surface 34 is formed by folding the mountain as a curve 33, and the second nail surface 36 is formed by further folding the first nail surface 34 at the folding curve 35. A nail 24 is formed with the nail surface.

  The first claw surface 34 has a substantially triangular shape formed by folding lines 33 and 35 and an outer peripheral edge 38 linearly continuous from the side 37 of the hexagonal rotor surface 32. The second claw surface 36 has a rear end edge 39 extending linearly from one end P of the folding line 35 and an arc edge 40 formed between the other end Q of the folding line 35 and the tip R of the linear edge 39. . The arc edge 40 is provided so as to form a part of an arc of a virtual circle centered on the center O of the rotor surface 32 (which coincides with the axis when attached to the tilling shaft 17).

  The angle α formed by the rotor surface 32 and the first claw surface 34 is preferably 120 to 175 degrees. The angle β formed by the first nail surface 34 and the second nail surface 36 is preferably 90 to 150 degrees. The angle θ formed by the folding lines 33 and 35 is preferably 10 to 45 degrees. In this embodiment, α = 169 degrees, β = 117 degrees, and θ = 30 degrees are set.

  The rotor surface 32 is formed with an opening 44 having a shape and size through which the bracket 21 can be inserted. In this embodiment, since the three protruding pieces 28 are radially formed on the boss 26 of the bracket 21 at intervals of 120 degrees, the central opening 45 of the opening 44 is a circular shape having a center O and is smaller than the outer diameter of the boss 26. It has a slightly larger diameter, and three extended openings 46 are formed radially from the central opening 45 at intervals of 120 degrees, and the bracket 21 and the claw rotor 22 are substantially centered and the protruding piece 28 The extended opening 46 can be inserted into the opening 44 in such a positional relationship that the angle between the extended opening 46 and the extended opening 46 is adjusted.

  Further, in the rotor surface 32, elongated holes 47 are concentrically formed at the center O at intervals of 120 degrees at three positions in the middle of the extension opening 46. The long holes 47 are bolt insertion holes formed in the protruding pieces 28A and 28B of the mounting plates 28A and 28B of the bracket 21 when the bracket 21 is attached to the claw rotor 22 with the center O as an axis. It is formed at a position aligned with 29A and 29B.

  The operation of attaching the rotary rotary structure 20 to the tiller shaft 17 of the tiller 10 is performed as follows. First, the boss 26 of the bracket 21 </ b> A is attached to the tilling shaft 17, and a set screw (not shown) is screwed into the screw hole 31 to fix the bracket 21 </ b> A so as to rotate integrally with the tilling shaft 17. Similarly, the bracket 21 </ b> B is fixed to the tilling shaft 17.

  Next, the claw rotor 22B is fixed to the mounting plate 27B inside the bracket 21A. In this fixing, first, the bracket 21A and the claw rotor 22B are substantially centered, and the projecting piece 28B of the mounting plate 27A outside the bracket 21A and the extended opening 46 of the claw rotor 22B are angularly aligned. Then, the claw rotor 22B is passed from the outside of the bracket 21A to the inside of the outer mounting blade 27A, and then the claw rotor 22B positioned between the outer mounting blade 27A and the inner mounting blade 27B is any of the bracket 21A. By rotating the projecting piece 28B of the inner mounting plate 27B and the extended opening 46 of the claw rotor 22B at an angled position by rotating the claw rotor 22B inside the inner mounting blade 27B. While maintaining the approximate center alignment with the bracket 21 at this position, the nail low Chromatography 22B aligned with the bolt insertion holes 29A of each inner mounting plate 27B 3 single long hole 47 by rotating 60 degrees in either direction relative to the bracket 21A to be fastening bolted 42. Thereby, the claw rotor 22B is fixed in a state in contact with the outer surface of the inner mounting plate 27B of the bracket 21A.

  Next, the claw rotor 22A is fixed to the mounting plate 27A outside the bracket 21A. In this fixing, first, the bracket 21A and the claw rotor 22A are substantially centered, and the protruding piece 28B of the mounting plate 27A outside the bracket 21A and the extended opening 46 of the claw rotor 22A are angularly aligned. Then, the claw rotor 22A is passed from the outside of the bracket 21A to the inside of the outer mounting blade 27A, and at this position, the claw rotor 22A is moved in either direction with respect to the bracket 21A (the second of the claw rotor 22B that has already been installed). By rotating the claw surface 36 by 60 degrees in the direction in which the second claw surface 36 of the claw rotor 22 </ b> A does not interfere with the claw surface 36, the three long holes 47 are aligned with the bolt insertion holes 29 </ b> B of the outer mounting plate 27 </ b> A. Fix it. Accordingly, the claw rotors 22A and 22B are fixed to the mounting plates 27A and 27B of the bracket 21A, respectively.

  Similarly to the above, the two claw rotors 23A and 23B are attached to the bracket 21B at an attachment angle displaced by 60 degrees. As described above, the claw rotor 23 (23A, 23B) has a shape symmetrical to the claw rotor 22 (22A, 22B) with respect to the center O and the rotor surface.

  In this way, a double rotary tilling structure 20 on one side is obtained in which two claws rotors 22A, 22B; 23A, 23B are attached to the tilling shaft 17 via brackets 21A, 21B, respectively (FIG. 2). Since the claw rotors 22A, 22B; 23A, 23B are attached to the brackets 21A, 21B with bolts 42, 43 from the outside, the fixing work is easy.

  Next, the operation of the tillage rotary structure 20 will be described with reference to FIGS. 9 to 11. As shown in FIG. 1, the claw rotors 22 and 23 attached to the tilling shaft 17 of the tiller 10 via the bracket 21 rotate at a predetermined speed together with the tilling shaft 17 in the direction C opposite to the rotation direction B of the wheel 14. While digging into the soil S, scrapes the soil. The claw rotors 22 and 23 enter the soil near the point Q at the outermost position farthest from the center O (FIGS. 9A and 10A), and the first claw surface 34 and the second claw surface 36 The scoop surface 48 that is formed scrapes the soil and jumps up on both sides. The amount of soil picked up by the scoop surface 48 at the time shown in FIG. 9B and FIG. 10B is indicated by reference numeral S1, and when the end R of the arc edge reaches the surface of the soil S (FIG. 9C ), FIG. 10 (c)), the maximum amount of soil S2 is removed.

  The soil that has been picked up by the scoop surface 48 and struck up outwardly hits the cover 15 disposed above the tillage rotary structure 20 and falls downward. In this way, it is possible to excavate and form the groove G1 serving as a nursery for vegetables and the like, and to form the embankment L1 on both sides thereof (FIG. 11).

  Here, the depth H1 of the groove G1 is mainly the depth at which the scoop surface 48 bites into the soil S, in other words, the distance from the soil S surface to the arc edge 40 of the second claw surface 36 of the claw rotors 22 and 23. The groove depth H1 can be adjusted by adjusting the mounting angle of the tillage rotary structure 20 by lever operation or the like using the tilt mechanism described above. The width W1 of the groove G1 mainly depends on the distance in the thickness direction between the rotor surface 32 of the claw rotors 22 and 23 and the arc edge tip R of the second claw surface 36. For example, the bending angle β of the second claw surface 36 and The groove width W1 can be adjusted by changing the size. The angle γ1 formed between the bottom surface and the side surface of the groove G1 is determined mainly depending on the angle (α + β−180 degrees) formed between the rotor surface 32 of the claw rotors 22 and 23 and the second claw surface 36. The groove wall angle γ1 can be adjusted by changing the bending angle α and / or β. In this way, the groove G1 having an arbitrary shape and depth can be formed in accordance with the type of root vegetables to be seeded and the soil quality of the soil. The amount of the embankment L1 mainly depends on the amount of soil scraped by the scoop surface 48 determined by the bending angle β and / or the size of the second nail surface 36.

  Although the tilling rotary structure 20 according to the embodiment of the present invention has been described in detail, the present invention can be widely modified in accordance with the intended nursery shape and the like. For example, in the above-described embodiment, the bracket 21 (21A, 21B) having two mounting plates 27A, 27B with an interval in the axial direction is used, and a claw rotor is provided inside each mounting plate 27A, 27B. 22 (22A, 22B) and 23 (23A, 23B) are fixed to obtain a double rotary tilling rotary structure 20, but the attachment positions of the claw rotors 22, 23 are inside or outside the attachment plates 27A, 27B. Either of these is acceptable. Therefore, according to the claw rotor mounting position of the above-described embodiment, a groove having a standard groove width W1 can be formed by excavation, whereas the claw rotor 22, If the claw rotors 22 and 23 are attached to the inner side of the outer mounting plate 27B, a smaller groove width (<W1) is formed. By attaching the claw rotors 22 and 23 to the outer mounting plate 27B and attaching the claw rotors 22 and 23 to the outer side of the outer mounting plate 27B, a larger groove width (> W1) will be formed. Even when 21 and the claw rotors 22 and 23 are used in combination, a desired groove width can be selected from the three groove widths.

  Moreover, it is good also as a tilling rotary structure which replaces with the tilling rotary structure 20 of 1 side 2 series, and has one nail | claw rotor 22 and 23 on one side. In this case, the bracket 21 provided with one mounting plate 27 is used. Such an embodiment is suitable when it is desired to form a groove having a relatively small groove width.

  It is good also as the tilling rotary structure 20 which has many claw rotors 22 and 23 about one side, The example is shown by FIG. In this embodiment, a rotary rotary structure in which claw rotors 22A and 22B; 23A and 23B arranged in two layers in the same direction as in the above-described embodiment are installed as a set (4 sets on one side in the illustrated example). It is shown as 20. In this case, two sets of mounting plates 27 (27A, 27B) as shown in FIGS. 3 to 5 are mounted in the same number as the number of the claw rotors 22, 23 at predetermined intervals in the axial direction. The bracket 21 is used, and the boss 26 is extended to a length necessary for the bracket 21. The cover 15 of the cultivator 10 is also assumed to have a length sufficient to cover the four sets of claw rotors 22 and 23. According to the tillage rotary structure 20, the grooves G1 and the embankments L1 as shown in FIG. 11 can be formed in multiple rows at a time, which is a particularly preferable embodiment when a large number of nurseries are formed on a wide cultivation land. obtain.

  Alternatively, in this embodiment, the axial spacing between the pairs of claw rotors 22A, 22B; 23A, 23B arranged in two layers in the same direction is minimized as long as the claws 24 of these claw rotors do not interfere with each other. Such a configuration may be adopted. In this case, the claw rotors 22A, 22B; 23A, 23B have substantially the same configuration as a configuration in which a large number of claw rotors 22A, 22B; 23A, 23B are overlapped, and all the claw rotors 22A, 22B; Since the soil S is dug up, the groove G2 having a groove width W2 larger than the groove G1 formed by the double rotary claw rotary structure 20 (FIG. 2) on one side can be formed (FIG. 13). This can be a particularly suitable embodiment when forming a wide nursery. Since a large amount of soil is scooped up from the rotary rotary structure 20 having two claws on one side and jumped up on both sides, the amount of embankment increases (L2> L1). For the groove depth H2 and the groove angle γ2, refer to the above description for FIG.

  In addition, the embodiment in which the claw rotors 22 and 23 are stacked and used in the same direction has been described so far. However, an embodiment in which the claw rotors 22 and 23 are stacked in the opposite direction may be used. It is shown in FIG. That is, in the rotary rotary structure 20 of FIG. 2, the two claw rotors 22A, 22B; 23A, 23B on one side are mounted in the same direction with the second claw surface 36 facing outward, respectively. In the rotary structure 20, two claw rotors 22A, 22B; 23A, 23B on one side are mounted in such a manner that the second claw surfaces 36 are stacked in different directions. In FIG. 14, the second claw surfaces 36 of the outer claw rotors 22 </ b> A and 23 </ b> A are overlapped so that the second claw surfaces 36 of the inner claw rotors 22 </ b> B and 23 </ b> B face outward. According to the embodiment, the soil excavation width by the pair of claw rotors 22 and 23 is narrowed and the force to flip the soil diagonally outward is weak, but on the other hand, the force of stirring and mixing the soil is strong. As shown in FIG. 15, a linear groove G3 can be formed with a relatively narrow groove width W3 (<W1). Alternatively, on the contrary, the second claw surfaces 36 of the outer claw rotors 22A and 23A may face outward and the second claw surfaces 36 of the inner claw rotors 22B and 23B may face inward. good. For the groove depth H3 and the embankment L3, refer to the above description for FIG.

  In addition, when adopting the embodiment in which the claw rotors 22A, 22B; 23A, 23B of the two claw rotors 22A, 22B are overlapped in the opposite direction as shown in FIG. 14, each bracket 21 (21A, 21B) The two attachment plates 27 (27A, 27B) fixed to the two are arranged so that the two claws rotors 22A, 22B; the claws 24 opposite to the 23A, 23B are alternately arranged at substantially equal intervals. It is necessary to set. In other words, the bracket 21 used when the two claw rotors 22A, 22B; 23A, 23B are arranged with the claw 24 in the same direction, and the two claw rotors 22A, 22B; , 23B, two types of brackets 21 '(symbol only, not shown) are prepared, and two in either the same direction or the opposite direction depending on the purpose and application The desired rotary rotary structure 20 can be obtained by attaching the claw rotors 22A and 22B; 23A and 23B.

  Alternatively, the claw rotors 22A, 22B; 23A, 23B arranged in two opposite layers as shown in FIG. 14 are set as one set, and a plurality of sets (for example, four sets on one side as shown in the embodiment of FIG. 12). ) It is good also as the tilling rotary structure 20 installed. In this case, a bracket 21 ′ is used in which a set of two mounting plates 27 (27A, 27B) in the bracket 21 ′ is attached in the same number as the number of pairs of claw rotors 22, 23 at a predetermined interval in the axial direction. The boss 26 is extended to the required length. According to the tillage rotary structure 20, the grooves G3 and the embankments L3 as shown in FIG. 15 can be formed in multiple rows at a time, which is a particularly preferable embodiment when a large number of nurseries are formed on a wide cultivated land. obtain.

  The claw rotors 22 (22A, 22B) and 23 (23A, 23B) in the above-described embodiment are formed by processing and bending a single steel plate, but the rotor surface 32 and the claws 24, 25 are separate members. And may be formed integrally with a bolt or the like. In that case, the claws 24 and 25 can be formed of a cemented carbide such as WC-Co or WC-TiC to improve wear resistance. In both the integrated type and the separate type, the tip of the claws 24 and 25 is coated with a cemented carbide, diamond, DLC or the like by ionized vapor deposition or the like, or the chip is embedded to improve wear resistance. It is also effective. The number of the claws 24 and 25 included in one claw rotor 22.23 can be set as appropriate within a range of 3 to 10.

  Further, in the claw rotors 22 (22A, 22B) and 23 (23A, 23B) in the above-described embodiment, the first claw surface 34 is bent from the rotor surface 32 at the folding line 33 to form a folding curve. Although the second nail surface 36 is bent to form the claws 24 and 25 by valley folding at 35, the claws 24 and 25 may be formed by bending more times. Such a nail shape is also within the scope of the present invention.

  In addition, the bracket 21 in the above-described embodiment is assumed to have the inner diameter 30 formed in the spline shape corresponding to the mounting to the tilling shaft 17 having the spline shape. The inner diameter shape is not particularly limited as long as it is mounted so as to rotate together. For example, if the tilling shaft 17 has a hexagonal shape, the bracket 21 having a hexagonal inner diameter 30 corresponding thereto can be used.

DESCRIPTION OF SYMBOLS 10 Cultivator 11 Handle 12 Frame 13 Engine 14 Wheel 15 Cover 16 Chain case 17 Cultivation shaft 20 Cultivation rotary structure 21 (21A, 21B) Bracket 22 (22A, 22B) Claw rotor 23 (23A, 23B) Claw rotor 24 Claw 25 Claw 26 Boss 27 (27A, 27B) Mounting plate 28 (28A, 28B) Projection piece 29A, 29B Bolt insertion hole 30 Spline inner diameter 31 Screw hole 32 Rotor surface 33 Folding curve (mountain fold)
34 First nail surface 35 Folding curve (valley fold)
36 Second claw surface 37 Rotor surface side 38 First claw surface outer peripheral edge 39 Second claw surface rear end edge 40 Second claw surface arc edge 41 Reinforcement rib 42 Bolt (fastening means)
43 Bolt (fastening means)
44 Opening 45 Center opening 46 Extension opening 47 Slotted hole 48 Scoop surface S, S1, S2
G1, G2, G3 Groove L1. L2. L3 banking

Claims (10)

A tiller rotary structure connected to a tiller, comprising a bracket and a claw rotor, and the bracket includes a boss attached to the tiller shaft so as to rotate integrally with the tiller shaft driven to rotate by the tiller, and this A flat plate-shaped rotor surface having a flat mounting plate with projecting pieces projecting radially from the outer periphery of the boss, and a claw rotor having a flat rotor surface with an opening through which the entire bracket including the projecting pieces can be inserted in the axial direction; A tillage rotary structure having a claw projecting radially from the rotor surface, wherein the claw rotor is fixed to the bracket at a relative rotation angle position at which the bracket cannot be inserted. 2. The tillage rotary structure according to claim 1, wherein the claw rotor is disposed either inside or outside the bracket. The mounting plate of the bracket has a disc-shaped main portion that is concentric with the boss and has a larger diameter than the boss, and the protruding pieces that protrude radially from the disc-shaped main portion at equal angular intervals, and the opening of the claw rotor is The projecting piece of the mounting plate at a relative rotational angle position in which the central opening through which the disc-shaped main part of the mounting plate can be inserted, the projecting piece of the mounting plate of the bracket and the extension opening of the claw rotor are aligned in the axial direction The claw rotor is fixed to the bracket at a relative rotational angular position where the projecting piece and the extension opening are not aligned in the axial direction. The tillage rotary structure according to 1 or 2. A predetermined number of bolt insertion holes are formed in the protruding piece of the mounting plate of the bracket and the rotor surface of the claw rotor, and the bolt insertion holes are formed in such a way that the protruding piece of the mounting plate of the bracket and the extension opening of the claw rotor are in the axial direction. A bolt that is inserted into a bolt insertion hole at a position aligned in the axial direction, and a bolt that is inserted into a bolt insertion hole at the position aligned in the axial direction. The tillage rotary structure according to claim 3, wherein the tillage rotary structure is constituted by a nut screwed onto the tiller. The claw of the claw rotor is composed of a first claw surface extending in one direction from the rotor surface and a second claw surface protruding in the opposite direction from the first claw surface, and is formed by the first claw surface and the second claw surface. The tillage rotary structure according to any one of claims 1 to 4, wherein the soil is dug up by a scoop surface. The tilling rotary structure according to any one of claims 1 to 5, wherein two mounting plates are fixed to the boss of the bracket at an interval in the axial direction, and a claw rotor is fixed to each mounting plate. . A set of two mounting plates provided at intervals in the axial direction is fixed to the bosses of the bracket, and a plurality of sets are fixed at intervals between the sets in the axial direction, and the claw rotor is fixed to each mounting plate. The tillage rotary structure according to any one of claims 1 to 5, wherein The tilling rotary structure according to claim 6 or 7, wherein a claw rotor is fixed to the two mounting plates so that the claw faces each other. The tilling rotary structure according to claim 6 or 7, wherein the claw rotor is fixed to the two mounting plates with the claw in the same direction. The claw of the claw rotor is composed of a first claw surface extending in one direction from the rotor surface and a second claw surface protruding in the opposite direction from the first claw surface, and is formed by the first claw surface and the second claw surface. The tillage rotary structure according to any one of claims 1 to 9, characterized in that the soil is dug up by a scoop surface.