JP3231628B2 - Rotary tilling equipment - Google Patents

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 arranged inside near a transmission case and the first rotary shaft is arranged outside the transmission case.

[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. The shaft is a normal rotation shaft, and the outer first rotary shaft is a reverse rotation shaft. The normal rotation shaft and the reverse rotation shaft are provided with a plurality of normal rotation claws and reverse rotation claws. In one of the inner normal rotation nails, the tip of the 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, for example, according to the above-described conventional example, since the reverse claw is provided outside the normal claw, the tilling soil to be scattered to the rear side by the normal claw is rotated by the reverse claw. I was not able to fly behind because of my nails,
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.

An object of the present invention is to provide a rotary tilling apparatus capable of leveling the cultivated land after tilling over the entire cultivation width. is there.

[0008]

In order to achieve the above object, according to the first aspect of the present invention, a first rotary shaft (11) having a tilling claw at a lower portion of a transmission case (10).
And the second rotary shaft (12) is arranged coaxially, and the second tilling claw (14) fixed to the second rotary shaft (12) is arranged inside the power transmission case (10). And a first tilling claw (13) fixed to the first rotary shaft (11) is arranged outside the second tilling claw (14), and a rotation transmitting means in the transmission case (10). The rotation of (23) is performed via the reversing mechanism (15).
Rotary shaft (11) and the second rotary shaft (12)
In the rotary tilling apparatus (6) transmitted as rotations in opposite directions to each other, the reversing mechanism (15) includes the first rotary shaft (11) and the second rotary shaft (1).
2) is rotated in the opposite direction at the same speed, the second tilling claw (14) has a tilling claw (19) that curves outward and throws soil outward. In a state where forward rotation is transmitted to the second rotary shaft (12) and reverse rotation is transmitted to the first rotary shaft (11), the second tilling claw (14) is rotated. When the tilling claw (19) for throwing soil in the outward direction comes out of the ground surface, the first tilling claw (13) is positioned so as to be off the side of the second tilling claw (19). , The first and second tilling claws (1
3, 19) are arranged.

Further, according to the present invention, a forward / reverse switching mechanism (80, 63, 7) is provided in the transmission case (2).
1, 72, 73), and the forward / reverse switching mechanism (80,
63, 71, 72, 73) by transmitting forward or reverse rotation to the rotation transmitting means (23), and the first and second tilling claws (13, 14, 19) rotate forward and backward. It is characterized by having a symmetrical shape in side view so that it can be commonly used for reverse rotation.

Further, according to a third aspect of the present invention, the reversing mechanism (15) comprises a bevel gear, and the first side gear (16) interlocked with the rotation transmitting means (23).
A second side gear (18) interlocked with the second rotary shaft (12); and both side gears (16, 1).
8) a center gear (17) supported by a center pin (21) fixed to the transmission case (10) and orthogonal to the axis of the rotary shaft (11). It is characterized by.

According to the present invention, the rotation of the rotation transmitting means (23) in the transmission case (10) is directly controlled by, for example, the first line via the spline (11a).
Of the first tilling claw (1)
3) is rotated in one predetermined direction. On the other hand, the rotation of the rotation transmitting means (23) is transmitted to a center gear (17) via a first side gear (16) by a reversing mechanism (15), and further transmitted to a center gear (17) via a second side gear (18). 2 by rotating the rotary shaft (12) in the opposite direction to the second tilling claw (1).
4) rotate in the other direction.

At this time, the first rotary shaft (11) and the second rotary shaft (12) rotate in opposite directions at the same speed by the reverse rotation mechanism (15). On the other hand, the second tilling claw (14) has a tilling claw (19) that curves outward and throws soil outward, and has the second rotary shaft (12). ) Is a forward rotation and the first rotary shaft (11) is rotating in the reverse direction, and a tilling claw (19) for throwing soil in an outward direction of the second tilling claw (14).
The first and second tilling claws (19) so that the first tilling claws (13) deviate from the sides of the second tilling claws (19) when exiting from the ground surface. Are arranged.

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. The speed change lever 31
Has a U-shaped base end, and is connected to a shift fork (not shown) so as to be freely rotatable in the vertical direction and integrally linked in the horizontal direction.

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 shift shift shaft 41 is disposed on both sides of the inside 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.

As shown in FIG. 3, the shift gear 46 for shifting is engaged with the gear 65 of the output shaft 36 to shift to the first forward speed F.
₁ , the shift gear 46 is engaged with the gear 47 which is always engaged with the gear 67 of the output shaft 36, the forward second speed F ₂ , and the shift gear 46 is constantly engaged with the gear 69 of the output shaft 36. The reverse R is obtained by engaging with the gear 70 of the intermediate shaft 34 that is engaged.

On the other hand, as shown in FIG. 3, 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.
Is the output shaft 3 constantly meshed with the gear 72 of the intermediate shaft 34.
6 is directly engaged with the gear 73 to obtain CSC rotation.

The rotation of the traveling transmission system is controlled by the output shaft 36.
Traveling wheel 5 from the above through a chain and a differential gear
The rotation of the rotary transmission system is transmitted through a chain 52 in a tilling chain case (transmission case) 10 continuously provided behind the transmission case 2 to a rotary tilling device 6 provided at a lower portion thereof. Is transmitted.

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 machine body traveling direction, and a direction opposite to the first rotary shaft 11. , Which are arranged coaxially, and furthermore, each of these rotary shafts 11 and 12 has a heart-shaped first tilling claw 13 and a second
Tilling claws 14 are attached.

In order to transmit the reverse rotation to the rotary shafts 11 and 12, a pair of left and right reversing mechanisms 15 is provided at the lower portion of the tilling chain case (hereinafter referred to as a "center case" because of the central drive system). , 15 are provided. The reversing mechanisms 15, 15 have three bevel gears 16, 17, 18, respectively. The reversing mechanism 1
5 is bilaterally symmetric, and only one of them will be described below.

As shown in detail in FIG.
The lower end portion of the case 10 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 in a hole portion of the case 10 is bolted. B is fixed.

The center gear (center gear) 17 of the three bevel gears 16, 17, 18 constituting the reversing mechanism 15 is rotatably supported via a needle bearing on a center pin 21 orthogonal to the rotary shaft. Have been. Also, the inner diameter side (base) end of the center pin 21 is
The support boss 22 is erected on the first rotary shaft 11 so as to be rotatably inserted therein. The support boss 22 has a round outer peripheral surface and a substantially spherical shape (taiko body shape). ing. The support boss 22 has a cylindrical hole 22a, through which the first rotary shaft 11 is rotatably supported.

A gear (first side gear) 16 at the center of the center case 10 among the three bevel gears 16, 17, 18 is engaged with a spline 11a formed at the center of the first rotary shaft 11. The teeth are meshed with the center gear 17, and the sprocket 23 is arranged at the back, that is, sandwiched between the first left and right side gears 16, 16. The sprocket (rotation transmitting means) 23 meshes with the chain 52 and meshes with the spline 11 a of the first rotary shaft 11.

A gear (second side gear) 18 of the three bevel gears 16, 17, 18 which is remote from the center case 10 is meshed with the center gear 17 and has a boss 18a. The boss 18a is rotatably supported on the first rotary shaft 11 by a needle bearing 24 disposed in a recess formed in the hole. Further, a ball bearing 25 is mounted on the outer periphery of the tooth portion rear surface of the boss portion 18a, and the holder 20 fixed to the center case 10 via the bearing 25 is provided.
It is supported rotatably. The boss portion 18a
A spline 18 b is formed on the outer peripheral surface on the distal end side of the second rotary shaft 12. The spline 18 b 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, and a ball bearing 27 is provided on an inner peripheral surface thereof. And an oil seal 28. In addition, a small diameter portion 12 protruding toward the center case 10 side.
An oil seal 50 is mounted on the outer peripheral surface of the cylinder c, and a spline engaging with the spline 18b is formed on the inner peripheral surface of the oil seal 50.

A screw 11b is formed at the tip of the first rotary shaft 11, and a collar (restriction member) 51 is attached to the rotary shaft 11 by screwing to the screw 11b. The collar 51 is fitted on the first rotary shaft 11 and abuts against the inner race of the ball bearing 27. The oil seal 28 is mounted on the outer periphery of the collar.

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 ' 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. Further, a second tilling claw 14 and a mud dropping claw 83 are mounted on the claw mounting plate 12a of the second rotary shaft 12. This mud claw 83
Is sized so as to move on a circumference smaller than the rotation circumference of the second tilling claw 14, and serves to drop mud adhering to the center case 10 without tilling. The first and second tilling claws 13, 14
Has a heart-shaped plate-like body having blades before and after in the rotation direction, 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 invention, the reversing mechanism 15 is configured to rotate the first rotary shaft 11 and the second rotary shaft 12 in the opposite direction at the same speed.
Is characterized by having a tilling claw that curves outward and throws soil outward.

That is, the reversing mechanism 15 appropriately selects the number of teeth of each of the three bevel gears 16, 17, and 18 constituting the reversing mechanism 15 so that the first rotary shaft 11 and the The two rotary shafts 12 can rotate at the same speed and in mutually opposite directions.

A glove claw (tiling claw) 19 in addition to the second tilling claw 14 is fixed to the claw mounting plate 12a provided on the outer peripheral portion of the second rotary shaft 12. The glove claw 19 has a shape that is curved outward and plays a role of releasing the tilling soil outward.

FIGS. 5A to 5D show the glove claws 1.
9 shows the shape of the second embodiment.

That is, 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, and mounting holes 55, 55 are provided on the mounting base side. The glove claw 19 has one direction in the vicinity of the base for attachment to the rotary shaft 12 when viewed from the front (FIG. 5B).
To the right) and the tip is in the other direction (FIG. 5).
A curved portion 19a is formed between the two curved portions so as to be curved toward the left side of (b). 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.

Instead of the glove claws 19, the second tilling claws 14 may be mounted facing outward. In this case, the second tilling claws 14 facing outward are attached to the center case 10 so as not to interfere with the first tilling claws 13 during rotation of the claws.

FIG. 6A shows a state in which the first tilling claws 13 (13-1 to 13-4) are attached to the outer first rotary shaft 11 remote from the center case 10. . In the present embodiment, four first tilling claws 13 are attached, and the outermost tilling claws 13 are provided.
-1, the second tillage claw 13-2 from the outside, the third tillage claw 13-3 from the outside, and the innermost tillage claw 13-4
Are attached at regular intervals of approximately 90 degrees.

FIG. 6B shows the second tilling claw 14 and the glove claw 1 on the inside of the second rotary shaft 12 near the center case 10 and on substantially the same circumference.
9 and the mud-off claws 83 are attached at substantially equal intervals of 120 degrees.

The present invention also relates to the second rotary shaft 1.
2 is a state in which a forward rotation is transmitted to the first rotary shaft 11 and a reverse rotation is transmitted to the first rotary shaft 11, and the tilling claw 1 that throws soil in the outward direction of the second tilling claw 14.
When the 9 comes out of the ground surface, the first tilling claw 13
The first and second tilling claws 13 and 19 are arranged so as to be located off the side of the tilling claw 14 of FIG.

That is, FIGS. 7A to 7C and FIG.
In (a) to (c), the first tilling claw 13 rotates in the reverse direction (clockwise), and the glove claw 19 rotates at the same speed as the first tilling claw 13 and rotates in the forward direction (counterclockwise). 8 (a), when the glove claw 19 comes out of the ground surface, the first tilling claw 13 is previously set in a phase relationship in which the glove claw 19 is off the side of the glove claw 19, as shown in FIG. Is set.

The soil plowed by the glove claws 19 is embraced in a large amount in the concave portion 19a, and is 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.

FIGS. 9A and 9B show the mounting phases of the glove claws 19, 19 mounted on the left and right second rotary shafts 12, 12, respectively. The left and right glove claws 19, 19 have an angle α ° (approximately 12
0 °).

Thus, the left and right glove claws 19, 19
By shifting the mounting phase of the tilling, the tilling reaction force can be reduced particularly in a hard field, and the three tilling claws 1 are arranged on substantially the same circumference of the second rotary shaft 12.
By attaching 4, 19, 83, the tilling nail can be driven into the field a plurality of times while the second rotary shaft 12 makes one rotation, and the fine soil effect is also improved. Also,
Since the second tilling claw 14 is curved inward toward the transmission case 2, the mud attached to the transmission case 2 is scraped off, and the glove claw 19 is curved outward. Claws 19
The mud adhering to the transmission case 2 can be stroked by the rear projecting portion.

Since the present embodiment has the above-described structure, the rotation of the engine 3 is transmitted to the input shaft in the transmission case 2 via the 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). It slides along 41 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.

[0048] 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.

By the way, as the field for tilling, the field conditions are various such as a hard field and a soft field, but when the operator operates the shift lever 31,
If the rotation direction of the first tilling claw 13 is switched between forward and reverse, the second tilling claw 14 rotates in reverse and forward in response to this, so that a certain tilling performance can be secured by the operator's selection. . In this case, the first and second tilling claws 1
Since the sides 3 and 14 have a heart shape in a side view having blades before and after the rotation direction, there is no change in the tilling performance even if the rotation direction of the tilling claws 13 and 14 is switched between forward and reverse.

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 first tilling 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 second plow 14 rotates in the other direction (for example, in the same direction as the wheels). .

At this time, FIGS. 7A to 7C and FIG.
As shown in (a) to (c), when the glove claw 19 comes out of the ground surface, the first tilling claw 13 is preset to have a phase relationship deviating from the side of the glove claw 19. For this reason, the soil tilled by the glove claws 19 is embraced in a large amount in the concave portion 19a and then thrown outward by centrifugal force, and the tilled soil near the center of the cultivated land is released to the left and right ends. As a result, the tillage marks are leveled without being filled.

[0054]

As described above, according to the present invention, the first rotary shaft and the second rotary shaft rotate in the opposite direction at the same speed, and the second tilling claw curves outward. And the second rotary shaft is rotating in the forward direction and the first rotary shaft is rotating in the reverse direction. When the tilling claw that throws soil outwards comes out of the ground surface, the first tilling claw is
By arranging the first and second cultivating claws so as to be off the side of the cultivating claws, the first tilling when the second cultivating claws curving outwardly emerges from the ground surface. Since the nail is not on the side, a large amount of soil from the second tilling nail that curves outward is smoothly added to the place where the amount of soil scattering behind the first tilling nail is small, and Can be equalized.

Further, according to the present invention, the forward or reverse rotation is transmitted to the rotation transmitting means via a forward / reverse switching mechanism provided in the transmission case, and the first and second tilling claws are
Since it has a symmetrical shape in side view, it can be used for both forward rotation and reverse rotation.

Further, the present invention relates to a first bevel gear comprising a bevel gear.
By configuring the reverse rotation mechanism with the side gear, the second side gear, and the center gear, the transmission case can be made compact, and it is possible to reduce the possibility of holding soil in front of the transmission case.

[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.

5A is a front view of a glove claw, FIG. 5B is a side view thereof, FIG. 5C is a sectional view taken along line AA, and FIG.
It is B sectional drawing.

FIG. 6 (a) is a side view in a state where a first tilling claw is attached, and FIG. 6 (b) is a side view in a state where a second tilling claw is attached.

FIGS. 7 (a) to 7 (c) show the positional relationship between the respective tilling claws when the first tilling claws attached to the rotary tilling device are reversed and the second tilling claws are rotating forward. It is a side view of an attachment state.

FIGS. 8 (a) to (c) show the 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 side view of an attachment state.

FIG. 9 (a) shows a first example of a rotary tilling device attached to a rotary tillage device.
FIG. 6 is a left side view showing a positional relationship between the tilling claw and the second tilling claw, and (b) is a right side view thereof.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Tiller 2 Transmission case 3 Engine 5 Running wheel 6 Rotary tillage device 10 Transmission (center) case 10a Wide part 11 First rotary shaft 12 Second rotary shaft 12a Claw mounting plate 13 First tillage claw 14 Second Tilling claw 15 Reverse rotation mechanism 16 First side gear 17 Center gear 18 Second side gear 19 Glove claw 19a Depressed portion 20 Holder 23 Rotation transmitting means (sprocket) 63 Rotary shift gear 71 Gear 72 Gear 73 Gear 80 Shift fork 82 Claw mounting Plate 83 Mud Claw

Continued on the front page. (72) Inventor Toyowa Utsunomiya 667 Iida-machi, Higashi-Izumo-cho, Yatsuka-gun, Shimane Prefecture Inside Mitsubishi Agricultural Machinery Co., Ltd. 1 Mitsubishi Agricultural Machinery Co., Ltd. (56) References JP-B-7-114561 (JP, B2) (58) Fields investigated (Int. Cl. ⁷ , DB name) A01B 33/12 A01B 33/08

Claims (3)

(57) [Claims] A first rotary shaft and a second rotary shaft each having a tilling claw are coaxially arranged at a lower portion of a transmission case, and a second tilling claw fixed to the second rotary shaft. Is disposed inside near the transmission case and the first tilling claw fixed to the first rotary shaft is disposed outside the second tilling claw, and the rotation of the rotation transmission means in the transmission case is controlled. A rotary tilling device configured to transmit the first rotary shaft and the second rotary shaft to the first rotary shaft and the second rotary shaft as rotations in opposite directions via a reverse rotation mechanism, wherein the reverse rotation mechanism includes the first rotary shaft and the second rotary shaft. The second rotary tine has a cultivating claw that curves outward and throws soil outward, and the second rotary The forward rotation is transmitted to the shaft and the first In the state where the reverse rotation is transmitted to the rotary shaft of the second tilling claw, when the tilling claw that releases soil in the outward direction of the second tilling claw comes out of the ground surface, the first tilling claw is The rotary tilling device, wherein the first and second tilling claws are arranged so as to be located off the side of the second tilling nail. 2. A forward / reverse switching mechanism is provided in a transmission case, and forward or reverse rotation is transmitted to the rotation transmitting means via the forward / reverse switching mechanism. The first and second tilling claws are The rotary tillage device according to claim 1, wherein the rotary tillage device has a symmetrical shape in a side view so as to be commonly used for normal rotation and reverse rotation. 3. The reversing mechanism comprises a bevel gear, a first side gear interlocked with the rotation transmitting means, a second side gear interlocked with the second rotary shaft, and meshes with both side gears. The rotary tillage device according to claim 1, further comprising: a center gear that is orthogonal to an axis of the rotary shaft and that is supported by a center pin fixed to the transmission case.