JPH1042605A - Rotary tillage tine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To level the tilled field all over the area of tilled width. SOLUTION: The glove tine 19 is bilaterally symmetry on the side view, when it is mounted, and can be used in both of the ordinary plowing and the reverse plowing. Further, this glove tine 19 is curved in one direction near the part at which it is mounted to the secondary rotary shaft and curved to the other direction at its top part to form a depression between the curved parts in the front view. Thus, a large amount of soil can be held in the depression 19a and splashed widely outward.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a tilling claw to be mounted on a rotary tilling device, and more particularly to a rotary tilling claw having a bilaterally symmetrical shape in a side view in an attached state, which can be commonly used for normal rotation and reverse rotation.

[0002]

2. Description of the Related Art In a rotary tilling apparatus to which a rotary tilling claw is applied, a plurality of tilling claws are mounted on a rotary shaft, and some of the tilling claws are rotated in the same direction as the machine body traveling direction. It is known that the cultivation can be performed while suppressing a dash phenomenon of the fuselage so as to be able to be switched to a state of rotating (forward rotation) or rotating (reverse rotation) in a direction opposite to the traveling direction of the fuselage.

[0003] As a tilling claw that can be rotated forward and backward, for example, a tilling claw described in Japanese Utility Model Publication No. 7-41283 is known. A fan-shaped tilling claw that extends and has a bilaterally symmetric spread in the direction of the rotation plane and further has a curved portion formed at the tip end is disclosed. And according to this tilling nail, the central part is reinforced by the action of the rib.

As another conventional example, Japanese Utility Model Publication No. 62-1
No. 8164 is known, and according to this conventional example, notch action portions are provided on both right and left side edges in the rotation direction, and the axis of the rotary shaft increases toward the center toward the tip end in the rotation direction. A tillage claw formed in an intermediate height protruding to one side in the core direction is shown, and it is intended to obtain a sharply plowable tillage nail having a certain strength while being thinned.

[0005]

In such a rotary tilling claw, generally, the soil tilled by the forward-turning claw is scattered to the rear side of the fuselage, and the soil tilled by the reverse-turning claw is generally a tilling claw. It is known that it is easily spilled in the middle of a round-trip because it is scattered to the rear side after being carried around with a rotary cover that covers the vehicle.

[0006] For this reason, for example, a reverse rotation claw is attached to the outside of the rotary shaft on which the normal rotation claw is mounted in the left-right direction.
And when the normal nail is a flat nail or a small-curved tilling nail, the amount of scattered tilling soil is small. There was a problem that the left and right ends of the cultivation width were low and the central part was high, with a tendency to “fill in the inside”.

[0007] It is not always bad for the cultivation marks to have an "inner 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.

On the contrary, if the outer tilling claw is curved inward when the outer tilling claw is rotated forward and the inner tilling claw is reversed, the inner tilling claw may be applied to the transmission case abdomen. The amount of scattered soil is great, and when the transmission case is of a central drive type, there is a problem that a groove is formed in the center of the tilling track when the transmission case pushes the soil.

The present invention has been made in order to solve the above-mentioned problem, and an object of the present invention is to provide a rotary tilling claw capable of leveling a cultivated land after tilling over the entire cultivation width. is there.

[0010]

SUMMARY OF THE INVENTION In order to achieve the above object, the present invention relates to a rotary tilling claw (19) having a symmetrical shape in a side view, which can be used for both normal rotation and reverse rotation. Near the mounting base to the shaft (12), curving in one direction, and the tip curving in the other direction,
A concave portion (19a) is formed between the two curved portions;
It is characterized by the following.

The present invention also relates to the rotary tilling claw (1).
9) is a rotary shaft (1) that rotates coaxially in forward and reverse directions.
On the inner rotary shaft (12) in (1, 12),
It is characterized in that it is mounted with the concave portion (19a) facing outward.

[Operation] Based on the above configuration, the rotary tilling claw (19) of the present invention has a symmetrical shape in a side view in a mounted state, and has a shape that can be used for both normal rotation and reverse rotation. A front view of the state shows that, in the vicinity of the base for attachment to the rotary shaft (12), the concave portion (19a) is curved in one direction and the distal end is curved in the other direction. Are formed. And this concave part (1
9a) allows a large amount of soil to be held.

Further, the rotary tilling claw (19) has a rotary shaft (12) inside the rotary shaft (11, 12) rotating coaxially in the forward and reverse directions, and the concave portion (19a) outside. By being attached, the inner tilled soil can be thrown outward by centrifugal force after being hugged by the concave portion (19a).

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

[0015]

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, which 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 speed change lever 31 extends from above the transmission case 2 along the upper side of the handle 7, and the speed change lever 31 is moved from the lower side of the fuel tank 32 above the engine 3 to 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 (see FIG. 1).
The transmission case 2 includes a split case integrally formed including the tilling chain case 10, and a transmission shift shaft 41 is disposed in both sides of the transmission case 2 in the transmission case 2. No shift fork is slidably fitted by the 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 rotary shifter gear 63 is engaged with the gear 71 of the intermediate shaft 34 to obtain SCS rotation from the output shaft 36.
3 engages directly with the gear 73 of the output shaft 36, which is always meshed with the gear 72 of the intermediate shaft 34, to obtain CSC rotation.

The rotation of the traveling transmission system is transmitted from the output shaft 36 to the traveling wheels 5 via a chain and a differential gear, and the rotation of the rotary transmission system is provided continuously behind the transmission case 2. The power is transmitted to a rotary tilling device 6 provided below the tilling chain case (transmission case) 10 through a chain 52 in the tilling chain 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 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 FIG. 4, the lower end of the center case 10 is slightly enlarged to form a wide portion 10a.
A through-hole is formed in the wide portion, and the holder 20 is fixed with a bolt.

The center gear (center gear) 17 of the three bevel gears 16, 17, 18 constituting the reversing mechanism 15 is rotatably supported by a center pin 21 orthogonal to the rotary shaft. Also, the center pin 21
An inner diameter (base) end of the first boss is erected on a support boss 22 rotatably fitted to the first rotary shaft 11.
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 the first
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, 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.

The first rotary shaft 11 includes 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. Further, the second tilling claw 14 and the mud dropping claw 83 are attached to the claw attachment plate 12a of the second rotary shaft 12 by bolts 34.
This mud dropping claw 83 is sized to move on a circumference smaller than the rotation circumference of the second tilling claw 14,
It plays a role of removing mud attached to the center case 10 without tilling. The first and second tilling claws 13 and 14 have a heart-shaped plate-like body having blades in the front and rear directions of rotation and have a tip end curved to one side.

The first rotating shaft 11 and the second rotating shaft 15 are appropriately selected by appropriately selecting the number of teeth of each of the three bevel gears 16, 17, 18 constituting the rotating mechanism 15. The rotary shaft 12 can rotate at the same speed and in opposite directions.

Here, according to the present invention, in the front view of the state of attachment to the rotary shaft 12, near the base for attachment to the rotary shaft 12, the tip curves in one direction and the tip curves in the other direction. A concave portion is formed between the two curved portions.

That is, a bolt 34 is provided on the claw mounting plate 12a provided on the outer peripheral portion of the second rotary shaft 12.
Thus, a glove claw (tiling claw) 19 is fixed in addition to the second tilling claw 14.

The glove claws 19 are shown in FIGS.
As shown in (d), the shaft is formed in a symmetrical shape when viewed from the side in the mounted state so as to be commonly used for normal rotation and reverse rotation, and mounting holes 55, 55 are provided on the mounting base side.
The glove claw 19 has a rotary shaft 12 when viewed from the front.
Near the base of attachment to one side (right direction in FIG. 5 (b)), and the tip bends in the other direction (left direction in FIG. 5 (b)). Concave part 19 between parts
a is formed.

The globe claw 19 is provided with first and second rotary shafts 11 and 12 which rotate coaxially in forward and reverse directions.
Is attached to the second rotary shaft 12 which is inside, with the concave portion 19a outside. This concave portion 19a
Has a large curved shape like a baseball glove, so that the concave portion 19a can hold a lot of tilling soil.

Further, comparing the soil flow between the glove claw 19 and the second tillage claw (straight claw) 14 in the soil, as shown in FIGS. 6 (a) and 6 (b), The soil flow is represented by arrows in the figure, and as is apparent from these figures, there is a range where there is no flow (shown by oblique lines). When the claws appear on the ground surface from the soil, the soil collected in the hatched area is scattered by the centrifugal force of the rotary. However, the glove claws 19 having the concave portion 19a having the wide hatched area have more soil. Can be scattered.

Further, when comparing the degree of impact received when the stone is bitten between the glove nail 19 and the second tilling nail (straight nail) 14, as shown in FIGS. 7 (a) and 7 (b), In the case of 14, the distance from the surface fixed by the claw mounting plate 12a to the tip is long, and the torsion moment is large. For this reason, not only breakage of the bolt but also deformation of the claw mounting plate 12a may be caused.

On the other hand, in the case of the glove claw 19, the position of the fixed surface of the claw mounting plate 12a and the position of the tip coincide, and no torsion moment is generated. Accordingly, the bolt may be broken, but the nail mounting plate 12a is less likely to be deformed.

In place of the glove claws 19, the straight claws 14 may be mounted facing outward. In this case, the outer straight claws 14 are attached close to the center case 10 so that the outward straight claws 14 do not interfere with the first tilling claws 13 during rotation of the claws.

FIG. 8A 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. 8B shows the second tilling claw 14 and the glove claw 1 on 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.

Further, in the present embodiment, in the state where the forward rotation is transmitted to the second rotary shaft 12 and the reverse rotation is transmitted to the first rotary shaft 11, When the tilling claw 19 for releasing the soil in the outer direction of the tilling claw 14 of the first tilling claw 14 comes out of the ground surface, the first tilling claw 1
The first and second tilling claws 13 and 19 are arranged so that 3 is located off the side of the second tilling nail 19.

That is, FIGS. 9A to 9C and FIG.
0 (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 ( 8 (a), when the glove claw 19 comes out of the ground surface, the first tilling claw 13 has a phase relationship in which it comes off from the side of the glove claw 19, as shown in FIG. It is set in advance.

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.

Next, FIGS. 11A and 11B show the left and right second
3 shows the mounting phases of the glove claws 19, 19 attached to the rotary shafts 12, 12. In the present embodiment, the left and right glove claws 19, 19 have an angle α ° (substantially 1 °).
20 °) staggered.

As described above, 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 configuration, 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 transmission lever 31 is located at the work neutral position N 'on the guide plate 33,
When the user 1 operates in the vertical (up / down) direction along the guide groove 35, a shift fork (not shown) slides along the shift shaft 26 and is positioned at an appropriate position corresponding to the indication on the guide plate 33. For example, when the first rotary shaft is moved forward from the neutral position N _R to the forward rotation position and the second rotary shaft is moved to the reverse rotation position SCS from the neutral position N _R , the shift fork engages the shifter gear 63 with the gear 71 to change the forward direction. The rotation in the same direction is transmitted to the rotary tillage device 6. Also, the shift lever 3
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 in the direction opposite to the forward direction.
To communicate.

[0050] 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, various conditions such as a hard field and a soft field are different, 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 sprocket 2 through the chain 52
The rotation (forward rotation or reverse rotation) transmitted to 3 is transmitted to first rotary shaft 11 via sprocket 23. The first rotary shaft 11 is rotatably supported by a holder 20 fixed to the center case 10 via a ball bearing 26, a second side gear boss 18 a and a needle bearing 24. 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 the pair of left and right first side gears 16, and further transmitted to the second side gears via the center gear 17 supported by the 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. 9A to 9C and FIG.
As shown in FIGS. 0 (a) to (c), when the glove claw 19 comes out of the ground surface, the first tilling claw 13 is set in advance to have a phase relationship deviating from the side of the glove claw 19. For this reason, 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. Since it is released, the tillage marks are not leveled, but become even.

[0056]

As described above, according to the present invention, the front view of the mounting state is curved in one direction near the mounting base on the rotary shaft, and the tip is curved in the other direction. By forming a concave portion between the two curved portions, for example, when the inner tilling claw rotates forward, the concave portion embraces a large amount of cultivated soil, and this large amount of soil is reversed outward by centrifugal force. Since the claw portion can be replenished, the till marks can be leveled.

Further, according to the present invention, the rotary tilling claw comprises:
By attaching the concave portion to the outside of the rotary shaft that is the inner side of the rotary shaft that rotates coaxially in the forward and reverse directions, for example, when the inside tilling claw rotates forward, the concave portion embraces a large amount of cultivated soil. Therefore, the amount of soil accumulated on the abdomen of the transmission case can be reduced, so that a groove can be prevented from being formed at the center of the tillage mark.

[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.

5 (a) is a front view of a single glove claw, FIG. 5 (b) is a side view thereof, FIG. 5 (c) is a sectional view taken along line AA, and FIG. 5 (d) is a sectional view taken along line BB. .

FIG. 6A is a diagram showing a soil flow by a straight claw, and FIG. 6B is a diagram showing a soil flow by a glove claw.

7A is a diagram illustrating a state in which a straight claw bites a stone, and FIG. 7B is a diagram illustrating a state in which a glove claw bites a stone.

FIG. 8A is a side view of a first tilling nail attached, and FIG. 8B is a side view of a second tilling nail attached.

9 (a) to 9 (c) show the positional relationship of each tilling claw when the first tilling claw attached to the rotary tilling device is reversed and the second tilling claw is rotating forward. It is a side view of an attachment state.

FIGS. 10 (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.

11A is a left side view of a mounted state showing a positional relationship between a first tillage claw and a second tillage claw attached to a rotary tillage device, and FIG. 11B is a right side view thereof. It is.

[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) 82 Claw mounting plate 83 Mud dropping claw

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Takahiro Shinmon, Inventor 667 Idai-cho, Oji-machi, Higashi-Izumo-cho, Yatsuka-gun, Shimane 1 Inside Mitsubishi Agricultural Machinery Co., Ltd. Address 1 Inside Mitsubishi Agricultural Machinery Co., Ltd. (72) Inventor Yuji Ueda 667 Iya-cho, Oji, Higashiizumo-cho, Yatsuka-gun, Shimane 1 Inside Mitsubishi Agricultural Machinery Co., Ltd.

Claims (2)

[Claims] 1. A rotary tilling claw having a left-right symmetrical shape in a side view, which can be commonly used for normal rotation and reverse rotation, and which is curved in one direction near a base for attachment to a rotary shaft in a front view, and has a tip. Is curved in the other direction to form a concave portion between the curved portions. 2. The rotary tilling claw according to claim 1, wherein said rotary tilling claw is attached to a rotary shaft which is an inner side of a rotary shaft which rotates coaxially in forward and reverse directions, with said concave portion being outside.