JPH10178801A - Rotary cultivation device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To perform cultivation work by a hatchet pawl and to freely exchange the hatchet pawl corresponding to a rotation direction. SOLUTION: A first rotary shaft 11 and a second rotary shaft 12 rotatable in opposite directions from each other to which cultivation pawls are respectively fixed are coaxially arranged. A glove pawl 19 is arranged on an inner side near a transmission case 10 at the second rotary shaft 12 and the hatchet pawls are respectively arranged on both left and right outer sides of the glove pawl 19 at the first rotary shaft 11. The glove pawl 19 can be shared for normal rotation and reverse rotation and performs the role of throwing soil in an outer side direction. Also, the hatchet pawls are gnawed into the soil well with a high reversal property, however, the rotation direction is determined. Then, for the hatchet pawls, the right and left outer side rotary shafts 11" are made selectively freely exchangeable corresponding to the rotation direction of the first rotary shaft 11.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rotary tilling apparatus for arranging first and second rotary shafts coaxially, mounting tilling claws on each shaft, and driving the tilling claws in forward and reverse directions. In particular, the present invention relates to a rotary tilling apparatus in which the second rotary shaft is disposed inside near a transmission case, and the first rotary shaft is disposed on the left and right outer sides thereof.

[0002]

2. Description of the Related Art As a rotary tilling device of this type, a plurality of tilling claws are mounted on a rotary shaft, and some of the tilling claws are rotated (forward rotation) in the same direction as the machine body traveling direction. It is known that a cultivator can be switched to a state in which it is rotated (reversely rotated) in a direction opposite to the traveling direction of the vehicle, and tilling is performed while suppressing a dash phenomenon of the body.

For example, according to Japanese Patent Publication No. Hei 7-114561, first and second rotary shafts are arranged coaxially on the outer and inner sides on both right and left sides of a transmission case, respectively, and the inner second rotary shaft is arranged. A rotary tilling apparatus is described in which a shaft is a normal rotation shaft, and an outer first rotary shaft is a reverse rotation shaft, and a plurality of normal rotation claws and reverse rotation claws are attached to the normal rotation shaft and the reverse rotation shaft. In one of the inner normal rotation nails, the tip of the tilling nail is curved outward.

[0004]

Generally, in a rotary tilling apparatus, soil tilled by a forward-turning claw is scattered to the rear of the machine body, and soil tilled by a reverse-turning claw is rotated by a rotary covering the tilling claw. It is known that, since it is carried around between covers and scattered rearward, it is easily spilled during traveling.

[0005] For this reason, according to the technique described in the above-mentioned conventional example, since the reverse rotation claw is provided outside the normal rotation claw, the tilling to be scattered to the rear side by the normal rotation claw is provided. The soil is obstructed by the reversing claws and cannot be flung to the rear side. On the other hand, the soil plowed by the reversing claws is scattered backward after being carried around. As a result, there is a problem that the cultivated land after tilling has a so-called “inner tendency” in which the left and right ends of the cultivation width are low and the center is high.

[0006] It is not always bad that the tillage marks have an "ingrowth tendency". For example, when a plurality of ridges are formed for growing vegetables, the lower left and right ends are formed with the ridges. Although there are some good aspects such as a guideline, it is generally said that it is preferable that the tillage marks be level.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problem, and an object of the present invention is to make it possible to perform a tilling operation using a ratchet claw, and to make this ratchet claw replaceable according to a rotation direction. To provide a rotary tilling device.

[0008]

To achieve the above object, the present invention provides a first rotary shaft (11) having a tilling claw at a lower portion of a transmission case (10) and rotatable in opposite directions to each other. And the second rotary shaft (12) is arranged coaxially, and the second tilling claw (14) fixed to the second rotary shaft (12) is connected to the transmission case (10).
And said first rotary shaft (11)
In the rotary tilling device (1) in which the first tilling nails (13) fixed to the first and second tilling nails (14) are arranged on the left and right outer sides, respectively, the second tilling nails (14) It has a cultivating claw (19) that can be used for normal rotation and reverse rotation and that throws soil outward, and the first cultivating claw (13) is a nata claw that can be rotated in one direction and cultivated. The left and right claws can be selectively exchanged left and right according to the rotation direction of the first rotary shaft (11).

[0009] The present invention also relates to the second tilling claw (1) when at least forward rotation is transmitted to the second rotary shaft (12) and reverse rotation is transmitted to the first rotary shaft (11). 14) The tilling claw (1) for releasing the soil in the outward direction
9) When the first rotary shaft (13) comes out of the ground surface, the first rotary shaft (13) has a predetermined phase difference such that the first tilling nail (13) comes off the side of the second tilling nail (19). 1
1 ") is freely interchangeable.

According to the present invention, the first rotary shaft (11) and the second rotary shaft (12) each having a fixed tilling claw and rotatable in opposite directions are provided. Are arranged coaxially, and a second tilling claw (14) having, for example, a glove claw (19) is arranged on the second rotary shaft (12) on the inner side near the transmission case (10). In addition, on the first rotary shaft (11), there are arranged two sets of claws as first tilling claws (13) on both left and right outer sides of the second tilling claws (14).

The glove claws (19) can be used for both forward and reverse rotations and play a role of throwing soil outward, and the nata claws penetrate the soil well and have high reversibility. Since the rotation direction is determined, the outer crawler claw can be selectively exchanged left and right according to the rotation direction of the first rotary shaft (11). Things.

When the glove claw (19), which throws soil outwardly during tilling, comes out of the ground surface, the ratchet claw (13) is displaced from the side of the glove claw (19). With such a phase difference, the first rotary shafts (11 ″, 11 ″) are exchanged left and right.

The reference numerals in the parentheses are for comparison with the drawings, but do not limit the configuration of the present invention.

[0014]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 shows the appearance of a cultivator 1 to which the present invention is applied. The cultivator 1 includes a transmission case 2, an engine 3, running wheels 5, and a rear part of the transmission case 2 that constitute a body frame. A rotary tillage device 6, a handle 7, a rotary tillage depth control device 9, and the like are provided at a lower portion. Further, a pulley 4 (see FIG. 3) fixed to an input shaft 29 (see FIG. 3) of the transmission case 2 from an output pulley (not shown) of the engine 3.
A tension / relaxation belt is wound around the belt, and the belt and the pulley 4 are covered with a case 30.

Further, a transmission lever 31 extends from above the transmission case 2 along the upper side of the handle 7, and the transmission lever 31 is moved from below the fuel tank 32 above the engine 3 to the side of the transmission case 2.
Guide groove 3 of guide plate 33 mounted over
Guided to 5.

As shown in FIG. 2, the guide groove 35 has a first forward speed position F ₁ , a second forward speed position F ₂ , a neutral position N, a reverse position R, and a work neutral position in the lateral direction (left-right direction in the figure). N '
And a vertical (up-down) direction
There first rotary axis forward, position SCS of the second rotary shaft is reversed, the neutral position N _R and the first rotary shaft is reversed, the rotary rotation direction switching to the second rotary shaft has a forward position CSC It consists of steps.

As shown in FIG. 3, the transmission case 2 includes a traveling chain case 2a (FIG. 1).
And the transmission case 2 including the tilling chain case 10.
A speed change shaft 41 is disposed on both sides of the inside, and a shift fork (not shown) is slidably fitted to the shift shaft 41 by a click mechanism. The shift fork is engaged with a traveling shifter gear 46 spline-coupled to the input shaft 29 so as to be slidable only.

Further, adjacent to the shift shaft 41,
A rotary shift shaft 26 is provided on both side surfaces of the transmission case 2, and a shift fork 80 is slidably fitted to the shift shaft 26 by a click mechanism. The shift fork 80 is engaged with a rotary shifter gear 63 slidably connected to the input shaft 29 by a spline.

The rotary shifter gear 63 is engaged with the gear 71 of the intermediate shaft 34 to obtain SCS rotation from the output shaft 36. The shifter gear 63 always meshes with the gear 72 of the intermediate shaft 34. Directly engaged with the gear 73 of the output shaft 36 to obtain CSC rotation. The rotation of the traveling transmission system is transmitted from the output shaft 36 to the traveling wheel 5 via a chain and a differential gear, and the rotation of the rotary transmission system is transmitted to the tilling cultivator provided at the rear of the transmission case 2. The power is transmitted to a rotary tillage device 6 provided at a lower portion of the power transmission device via a chain 52 in a chain case (transmission case) 10.

As shown in FIG. 3, the rotary tillage device 6 includes a first rotary shaft 11 protruding left and right in a direction substantially perpendicular to the body traveling direction, and a first rotary shaft 11.
And a second rotary shaft 12 that rotates in the opposite direction, and these are arranged coaxially. Further, the two rotary shafts 11 and 12 further have a first tilling claw 13 and a second tilling claw, respectively. 14 are attached.

In order to transmit reverse rotation to the rotary shafts 11 and 12, a pair of left and right reverse rotation mechanisms 15 and 15 are provided below the tilling chain case (hereinafter referred to as "center case") 10. I have. The reversing mechanism 15,
Numeral 15 has three bevel gears 16, 17, and 18, respectively, for rotating the first rotary shaft 11 and the second rotary shaft 12 in the opposite direction at the same speed. The reversing mechanism 15 is bilaterally symmetric, and only one of the reversing mechanisms 15 will be described below.

As shown in detail in FIG.
The lower end portion is slightly enlarged to form a wide portion 10a, a through hole is formed in the wide portion, and a holder 20 having a cylindrical portion 20a and a flange portion 20b is fixed to a hole portion of the case 10. ing.

Bevel gear 1 constituting the reverse rotation mechanism 15
The center gear 17 at the center among the 6, 17 and 18 is rotatably supported by a center pin 21 orthogonal to the rotary shaft via a needle bearing. The base end of the center pin 21 on the inner diameter side is connected to the first rotary shaft 1.
The support boss 22 is rotatably fitted on the support boss 1 and stands upright. The support boss 22 has a cylindrical hole 22a, through which the first rotary shaft 11 is rotatably supported.

The first side gear 16 at the center of the center case 10 among the bevel gears 16, 17, 18 is
The first rotary shaft 11 is engaged with a spline 11a formed at the center of the first rotary shaft 11.
7, and a sprocket 23 is disposed on the back of the gear. The sprocket 23 meshes with the chain 52 and also meshes with the spline 11 a of the first rotary shaft 11.

The second side gear 18 on the side of the bevel gears 16, 17, 18 remote from the center case 10.
Is engaged with the center gear 17 and the boss 18
The boss portion 18a has a first portion formed by a needle bearing 24 disposed in a concave portion formed in the hole portion.
Is rotatably supported by the rotary shaft 11. Furthermore,
A ball bearing 25 is mounted on the outer periphery of the tooth portion rear surface of the boss portion 18a, and is rotatably supported by the holder 20 fixed to the center case 10 via the bearing 25. A spline 18b is formed on the outer peripheral surface on the tip end side of the boss 18a, and the spline 18b is engaged with the second rotary shaft 12.

The second rotary shaft 12 has a sleeve shape, and a claw mounting plate 12a for fixing the second tilling claw 14 is formed on an outer peripheral portion thereof. A spline that engages with the spline 18b is formed on the inner peripheral surface of the small-diameter portion 12c protruding toward the center case 10.

A screw 11b is formed at a tip portion of the first rotary shaft 11, and a collar 51 is attached to the rotary shaft 11 by being screwed to the screw 11b. The collar 51 is fitted on the first rotary shaft 11 and has an end surface in contact with the inner race of the ball bearing 27.

The first rotary shaft 11 comprises an inner rotary shaft 11 'at the inner center and an outer rotary shaft 11 "integrally connected to the left and right outer sides of the inner rotary shaft 11'. The outer rotary shaft 11 "has a pipe shape, is fitted into the inner rotary shaft 11 ', and is further connected with a pin 81 inserted therein.

On the outer periphery of the outer rotary shaft 11 ",
The claw mounting plate 82 is fixed, and the first
Tilling claws 13 are attached. The claw mounting plate 12a of the second rotary shaft 12 has a heart claw 8 and a mud dropping claw 83 attached thereto. The mud dropping claw 83 is sized to move on a circumference smaller than the rotation circumference of the heart claw 8 and serves to drop mud adhering to the center case 10 without tilling. I have.
The heart claw 8 forms a heart-shaped plate-like body having blades in the front and rear directions of rotation and has a distal end curved to one side. Note that a cup-shaped cover 85 is fixed to the base end side of the outer rotary shaft 11 ″, and the cover 85 covers the distal end portion of the second rotary shaft 12.

Here, in the present embodiment, the second tilling claw 14 has a tilling claw that can be used for both normal rotation and reverse rotation and that throws the soil outward, and the first tilling claw 13 Is a ratchet claw that can be rotated and tilled in one direction, wherein the ratchet claw can be selectively replaced left and right according to the rotation direction of the first rotary shaft 11.

That is, in addition to the heart claw 8, a glove claw (tiling claw) 19 is fixed to the claw mounting plate 12a provided on the outer peripheral portion of the second rotary shaft 12. Numeral 19 has a shape curved outward, and plays a role of throwing tilling soil outward.

The glove claw 19 has a symmetrical shape as viewed from the front so that it can be used for both normal rotation and reverse rotation. 10), and the distal end is curved outward in the axial direction, so that a concave portion 19a is formed between the curved portions. And this concave part 19a is largely curved and formed in the shape of a baseball glove,
As a result, a large amount of tilling soil can be held in the concave portion 19a.

As shown in FIGS. 4 and 5 (a) and 5 (b), the outer first
On the rotary shaft 11 of the present invention,
(13-1 to 13-4) are attached. In the present embodiment, four nata claws 13 are attached, the outermost nata claw 13-1, the second nata claw 13-2 from the outside, and the third nata claw 13- from the outside. 3 and
The innermost claws 13-4 are attached at regular intervals of approximately 90 degrees.

The second rotary shaft 12 on the inner side near the center case 10 has the heart claw 8, the glove claw 19 and the mud-claw 8 on substantially the same circumference.
3 are attached at substantially equal intervals of 120 degrees.

The outer rotary shafts 11 "and 11" are formed in a pipe shape, are fitted on the left and right sides of the inner rotary shaft 11 ', and are integrally connected and fixed by pins 81. The pin 81 can be inserted and removed in accordance with the rotation direction of the pin 11 so that the pin 81 can be replaced left and right. This is because the ratchet claw 13 attached to the outer rotary shaft 11 ″ has a shape that can be rotated in one direction and plowed, and thus the claw direction needs to be changed according to the rotation direction.

The soil plowed by the glove claws 19 is embraced in a large amount in the concave portion 19a and then thrown outward by centrifugal force. As a result, the tilled soil near the center of the cultivated land is discharged to the left and right end sides, so that the cultivated marks are not filled up and become even.

In this embodiment, when at least the forward rotation is transmitted to the second rotary shaft 12 and the reverse rotation is transmitted to the first rotary shaft 11, the second tilling claw 14 When the tilling claw 19 that throws the soil in the outward direction comes out of the ground surface, the first tilling claw 13 is separated from the second tilling claw 19 by a predetermined phase difference such that the first tilling claw 13 is positioned off the side of the second tilling claw 19. It is characterized in that the left and right rotary shafts 11 ″ and 11 ″ can be freely replaced.

That is, in FIGS. 6 (a) and 6 (b), the latch 13 fixed to the first rotary shaft 11 is rotating in the opposite direction (clockwise in the drawing), and the second rotary shaft is rotated. For example, when the glove claw 19 (and the heart claw 8 and the mud-dropping claw 83) fixed to the base 12 is rotating at the same speed as the nata claw 13 and in the forward direction (counterclockwise in the drawing), for example, The left and right first rotary shafts 11 ″ and 11 ″ are freely interchangeable so that the ratchet claw 13 has a phase relationship deviating from the side of the glove claw 19 when it comes out of the ground surface.

This also means that the glove 13 fixed to the first rotary shaft 11 rotates in the forward direction (counterclockwise in the drawing) and the second claw 13 fixed to the second rotary shaft 12. Even when the claw 19 is rotating in the opposite direction (clockwise direction in the figure), it is preferable that when the glove claw 19 comes out of the ground surface, the ratchet claw 13 has a phase relationship in which it comes off from the side of the glove claw 19. .

FIGS. 6A and 6B show the ratchet claw 1 at this time.
3 shows the mounting phase when viewed from the left and right side surfaces. As is clear from the figure, the phases of the ratchet claws 13 fixed to the left and right outer rotary shafts 11 ″ and 11 ″ are not the same. , Is installed in a shifted state. 6 (a) and 6 (b), in which the inner glove claw 19 is normal rotation and the outer gutter claw 13 is reverse rotation, and FIG. (A)
When the state is changed to the state shown in FIG.
When the glove claw 19 is out of the ground surface when the 1 ″ and 11 ″ are replaced with the left and right, respectively, when the glove claw 19 comes out of the ground surface, the ratchet claw 13 comes to a position where it comes off from the side of the glove claw 19. That's why.

In particular, it is known that when the inner glove claws 19 are cultivated in the normal rotation and the outer gutter claws 13 are cultivated in the reverse rotation, the cultivation marks are even. When the glove claw 19 comes out of the ground surface, it is considered that the nata claw 13 is located at a position where it comes off from the side of the glove claw 19.

It is to be noted that, although all the tilling claws can be coped with forward rotation and reverse rotation by using heart claws, Nata claws have a better bite at the time of tilling than heart claws, and the reaction force is greater than the body vibration. Has the advantage that it is less likely to be transmitted.

FIG. 8A shows a driving pattern of each claw into the soil when the inner glove claw 19 and the like are reversed and the outer gutter claw 13 is rotated forward. b)
Means that the inner glove claws 19 and the like rotate forward and the outer gutter claws 13
7 shows the driving pattern of each nail into the soil when is reversed.

From such a driving pattern, the phase can be determined so that when the glove claw 19 comes out of the ground surface, the ratchet claw 13 is located at a position off the side of the glove claw 19.

Next, the operation of the present embodiment will be described.

The rotation of the engine 3 is transmitted to an input shaft in the transmission case 2 via a belt in the case 30. When the operator moves the shift lever 31 in the lateral (left / right) direction along the guide groove 35 of the guide plate 33, the left / right movement of the shift lever 31 is transmitted to a shift fork (not shown). 4
1 and is positioned at an appropriate position corresponding to the indication on the guide plate 33. Depending on the lateral movement of the shift lever 31, rotary tiller 6 is not affected and is held to a rotary stop position N _R.

When the shift lever 31 is located at the work neutral position N 'on the guide plate 33,
When the user 1 operates the guide groove 35 in the vertical (up / down) direction, the shift fork 80 slides along the shift shaft 26 and is positioned at an appropriate position corresponding to the indication on the guide plate 33. For example, the shift lever 31 is moved to the neutral position N _R
When the first rotary shaft rotates forward and the second rotary shaft moves to the reverse rotation position SCS, the shift fork engages the shifter gear 63 with the gear 71 to rotate the rotation in the same direction as the forward direction to the rotary tiller 6. introduce. When the first rotary shaft is rotated in the reverse direction and the second rotary shaft is moved to the normal rotation position CSC, the shifter gear 63 engages with the gear 73 to rotate the shift lever 31 in the direction opposite to the forward direction. To 6.

[0049] Then, the shift lever 31 in a state of being moved up or down, move the lever 31 in the lateral direction so that the forward first speed position F ₁ along the guide groove 35.

Then, as described above, the shifter gear 46 is shifted via the shift fork so as to engage with the gear 65, and the low-speed rotation suitable for the work is transmitted to the wheels 5. Thereby, the rotary tilling device 6 plows in a state in which the first rotary shaft rotates in the reverse direction, the second rotary shaft rotates in the normal direction, or the first rotary shaft rotates in the normal direction and the second rotary shaft rotates in the reverse direction. The machine 1 moves forward, and the tillage work is performed.

The rotation (forward or reverse) transmitted to the sprocket 23 via the chain 52 is transmitted to the first rotary shaft 11 via the sprocket 23. The first rotary shaft 11 is rotatably supported by a holder 20 fixed to the center case 10,
The rotation of the rotary shaft 11 rotates the ratchet claw 13 in one predetermined direction (for example, the direction opposite to the wheel).

On the other hand, the rotation of the sprocket 23 is transmitted to a pair of left and right first side gears 16, and further transmitted to a second side gear 17 via a center gear 17 supported by a holder 20.
And transmitted to the second rotary shaft 12 via the spline 18b at the same speed. The second rotary shaft 12 is rotatably supported by the first rotary shaft 11 via a ball bearing 26, and the glove claws 19 and the like rotate in the other direction (for example, in the same direction as the wheels).

At this time, as shown in FIG. 6 and FIG. 7, when the glove claw 19 comes out of the ground surface, the nata claw 13 is set in advance in a phase relationship deviating from the side of the glove claw 19. Since the soil tilled by the glove claws 19 is embraced in a large amount in the concave portion 19a, it is thrown outward by centrifugal force, and the tilled soil near the center of the cultivated land is released to the left and right ends, The tillage marks are leveled without being filled.

[0054]

As described above, according to the present invention, according to the present invention, the second tilling claw fixed to the second rotary shaft is arranged inside near the transmission case, and the second tilling claw fixed to the first rotary shaft. In the rotary tilling device in which the first tilling claw is disposed on the left and right outer sides of the second tilling claw, the second tilling claw is a tilling claw that can be shared for normal rotation and reverse rotation and that throws soil outward. The first tilling claw is a nata claw that can be rotated and tilled in one direction, and the nata claw can be selectively replaced left and right according to a rotation direction of the first rotary shaft. As a result, it is possible to use, as the rotary tilling claw, a ratchet claw having good bite and high reversibility, and can cope with normal rotation and reverse rotation with a simple operation.

Further, the present invention provides a tilling method for throwing soil in an outward direction of a second tilling claw when forward rotation is transmitted to at least a second rotary shaft and reverse rotation is transmitted to a first rotary shaft. When the nail comes out of the ground surface, the first tilling nail is
By making the first rotary shaft freely replaceable left and right with a predetermined phase difference so as to deviate from the side of the tilling claw, the scattering of the soil becomes good and the tilling marks can be leveled.

[Brief description of the drawings]

FIG. 1 is a side view of a cultivator to which the present invention is applied.

FIG. 2 is a front view showing a guide groove of a guide plate.

FIG. 3 is a sectional view of a transmission and a rotary tilling device connected to the transmission in an unfolded state.

FIG. 4 is an enlarged sectional view of the rotary tillage device.

FIG. 5 (a) is a side view of a state in which a first tilling nail is mounted, and FIG. 5 (b) is a side view of a state in which a second tilling nail is mounted.

FIG. 6 (a) is a left side of an attached state showing a positional relationship of each tilling claw when a first tilling claw attached to a rotary tilling device is reversed and a second tilling claw is rotated forward. It is a front view and (b) is a right view of the attachment state similarly.

FIG. 7A is a left side of an attached state showing a positional relationship of each tilling claw when a first tilling claw attached to a rotary tilling device rotates forward and a second tilling claw reverses. It is a front view and (b) is a right view of the attachment state similarly.

FIG. 8A is a diagram illustrating a driving pattern of each claw when a first cultivation claw attached to a rotary cultivator rotates forward and a second cultivation claw reverses, b)
It is a figure which shows the driving pattern of each nail | claw when a 1st tilling nail | claw is reversed and a 2nd tilling nail | claw is rotating forward.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 cultivator 2 transmission case 3 engine 5 running wheel 6 rotary tilling device 10 transmission (center) case 10 a wide section 11 first rotary shaft 11 ′ inner rotary shaft 11 ″ outer rotary shaft 12 second rotary shaft 13 first Tilling claw (nata claw) 14 Second tilling claw 15 Reverse rotation mechanism 16 First side gear 17 Center gear 18 Second side gear 19 Glove claw 19a Concave portion 23 Sprocket 82 Claw mounting plate 83 Mud dropping claw

Claims (2)

[Claims] A first rotary shaft and a second rotary shaft, each having a tilling claw and rotatable in opposite directions, are coaxially arranged at a lower portion of a transmission case, and the second rotary shaft is coaxially arranged.
The second tilling nail fixed to the rotary shaft is disposed inside near the transmission case, and the first tilling nail fixed to the first rotary shaft is respectively provided on the left and right outer sides of the second tilling nail. In the rotary tilling device arranged, the second tilling claw has a cultivating claw that can be shared for normal rotation and reverse rotation and that throws the soil outward, and the first tilling claw is unidirectional. A rotary claw that can be rotated and plowed, and that the claw can be selectively replaced left and right according to the rotation direction of the first rotary shaft. 2. A tilling device that throws soil in the outward direction of the second tilling claw when at least forward rotation is transmitted to the second rotary shaft and reverse rotation is transmitted to the first rotary shaft. When the claw comes out of the ground surface, the first tilling claw is
The rotary tilling apparatus according to claim 1, wherein the first rotary shaft is freely replaceable left and right with a predetermined phase difference so as to be positioned off the side of the tilling claw.