JP2000295903A - Rotary tiller - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent the winding of grasses on tilling tines and tilling shafts, and at the same time, to solve troubles caused by collisions of tilling tines against obstacles buried in soil. SOLUTION: Each set of a normally rotating tilling shaft 34 and oppositely rotating tilling shaft 46 extends in the left or the right direction from a mission case 13. On each set of shafts, tilling tines 49a to 49f are placed, and also disk shaped dividing boards 50a to 50c are placed in such a manner that they touch the front ends of the tilling tines 49a to 49f. Due to the dividing boards 50a to 50c, the winding of grasses on the tilling tines and the tilling shafts can be prevented, and at the same time, when the dividing boards 50a to 50c touch obstacles such as stones or wood pieces buried in soil, the machine body is pushed up to result in the prevention of the collision of tilling tines 49a to 49f against such obstacles. This can prevent the trouble of giving foreign feeling to the operator attributable to the sudden changes of the driving force or resisting force of the machine body caused by the reaction of the rotating tilling tines 49a to 49f received from the obstacles.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rotary cultivator having a cultivating claw provided on a cultivating shaft extending from a transmission case to both left and right sides and rotated by an engine.

[0002]

2. Description of the Related Art Such a rotary cultivator is disclosed in
86502, JP-A-4-166424, and JP-B-46-39041.

[0003] Japanese Utility Model Laid-Open No. 57-86502 discloses that
A so-called front tine type rotary cultivator in which a plurality of tilling claws serving also as wheels for traveling are provided on a tilling shaft extending left and right from a transmission case is described.

Japanese Patent Application Laid-Open No. Hei 4-166424 discloses that an axle extending left and right from a traveling mission case is provided with traveling wheels, and is extended left and right from a tilling mission case located behind the traveling mission case. A so-called rear tine type rotary cultivator in which a plurality of tilling claws are provided on a tilling shaft is described.

Japanese Patent Publication No. 46-39041 discloses a pair of a forward tilling shaft and a reverse tilling shaft which are fitted coaxially and rotate in opposite directions to each other, on the left and right sides of a transmission case. Thus, there is described a rear tine rotary tiller that balances the propulsive force generated by a tilling claw provided on a forward rotation tilling shaft with the resistance generated by a tilling claw provided on a reverse rotation tilling shaft to prevent dashing. ing.

[0006]

However, in the above-mentioned conventional tilling machine, the grass that has been knocked down during tilling winds around the rotating tilling claw or tilling shaft. There was a problem that the depth became unstable. In addition, if the tilling claws collide with obstacles such as stones or wood chips buried in the soil, not only may the tilling claws be damaged, but also the aircraft may suddenly move due to the reaction force that the rotating tilling claws receive from the obstacles. There is a problem that a dashing phenomenon of advancing forward occurs or a phenomenon of a sudden deceleration of the body occurs, giving an uncomfortable feeling to the operator.

The present invention has been made in view of the above-mentioned circumstances, and prevents the grass from winding around a tilling claw or a tilling shaft, and solves the above-mentioned problems caused by the tilling claw colliding with an obstacle buried in the soil. The purpose is to eliminate.

[0008]

To achieve the above object, according to the first aspect of the present invention, a tilling claw is provided on a tilling shaft extending right and left from a transmission case and rotated by an engine. In a rotary cultivator, a rotary cultivator characterized by comprising a circular partition plate arranged so as to be orthogonal to a cultivation axis and adjacent to a rotation surface of a tilling claw is proposed.

According to the above construction, a circular partition plate is provided which is orthogonal to the tilling shaft extending left and right from the transmission case of the rotary tiller and adjacent to the rotation surface of the tilling claw provided on the tilling shaft. It is possible to prevent the grass from being pushed away by the plate and being wound around the tilling claw or the tilling shaft. Also, when the divider comes into contact with obstacles such as stones and wood chips existing in the soil,
The reaction force lifts the fuselage upwards and the tilling claws do not collide with the obstacle, thus preventing damage to the tilling nails and, of course, the reaction force that the rotating tilling claws receive from the obstacles. This prevents sudden changes in the propulsive force and resistance of the aircraft and gives the operator an uncomfortable feeling.

According to the second aspect of the present invention,
In addition to the configuration of the first aspect, a rotary tiller having a partition plate attached to a tillage shaft is proposed.

According to the above configuration, since the partition plate is mounted on the tilling shaft, the partition plate can be mounted adjacent to the rotation surface of the tilling claw without requiring a special mounting member.

According to the invention described in claim 3,
In addition to the configuration of the first aspect, a rotary tiller having a partition plate attached to a transmission case is proposed.

According to the above configuration, since the partition plate is mounted on the transmission case, the partition plate can be mounted without any trouble even when there is no mounting space on the tilling shaft.

According to the fourth aspect of the present invention,
In addition to the configuration of any one of claims 1 to 3, a rotary cultivator is proposed, in which a sharp edge is formed at the tip of the partition plate.

According to the above configuration, since the sharp edge is formed at the tip of the partition plate, it is possible to more effectively prevent cutting the grass at the edge of the partition plate and winding the grass around the tilling claw or the tilling shaft. it can.

According to the invention described in claim 5,
In addition to the configuration of claim 2, a rotary cultivator is proposed, wherein the tip of the partition plate is positioned radially outside the trajectory of the tip of the tilling claw.

According to the above configuration, the tip of the partition plate is positioned radially outward of the trajectory of the tip of the tilling claw. Therefore, when traveling on a pavement road or the like, the partition plate can be used instead of wheels. Since the tilling claws do not contact the road surface, noise generation and damage to the tilling claws can be prevented.

According to the invention described in claim 6,
In addition to the configuration of claim 1, a forward tilling shaft extending in both axial directions from the transmission case and driven forward by the engine, and arranged coaxially outside the forward tilling shaft and reversely driven by the engine. A rotary tiller is proposed, wherein a tillage claw is provided on each of a driven reverse tillage shaft.

According to the above configuration, the forward tilling shaft and the reverse tilling shaft arranged coaxially are provided with the tilling claws, respectively, so that the forward motive force generated by the forward tilling shaft and the reverse tilling shaft are generated. The dashing of the airframe can be effectively prevented by canceling the propulsive force in the reverse direction.

According to the seventh aspect of the present invention,
In addition to the configuration of claim 6, a partition plate provided on the reverse tilling shaft is located between the opposing portions of the tilling claw provided on the forward tilling shaft and the cultivating claw provided on the reverse tilling shaft. A rotary tiller is proposed.

According to the above construction, the tilling claw provided on the forward rotation tilling shaft is opposed to the partitioning plate provided on the reverse rotation tilling shaft. Winding of the grass around the nail can be effectively prevented.

[0022]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, embodiments of the present invention will be described based on embodiments of the present invention shown in the accompanying drawings.

1 to 4 show a first embodiment of the present invention. FIG. 1 is an overall side view of a rear tine walking rotary cultivator, and FIG. 2 is an enlarged sectional view taken along line 2-2 of FIG. FIG. 3 is a view in the direction of arrows in FIG. 1, and FIG.

As shown in FIG. 1, the rear tine type walking rotary cultivator T has an engine bed 12 extending forward from a traveling transmission case 11 supporting a pair of left and right wheels W, W. The engine E is mounted on the upper part of the bed 12. A steering handle 15 is mounted on an upper part of a tilling transmission case 13 connected to the rear of the traveling transmission case 11 via a mounting bracket 14.
Is provided. The upper surface of the rotary tilling unit 16 provided at the rear end of the tilling transmission case 13 is
At the rear of the rotary cover 17, a resistance bar 18 whose vertical position can be adjusted and a leveling plate 19 which can swing up and down are provided.

The crankshaft 20 of the engine E and the transmission input shaft 21 are connected by an endless belt 23 having a tension clutch 22.
And the axle 24 are connected by a transmission gear train 25 and an endless chain 26 housed in the traveling transmission case 21.
At the rear end of the tilling transmission case 13, a forward / reverse rotation mechanism 27 of the rotary tilling unit 16 is housed. The forward / reverse rotation mechanism 27 is connected to an endless chain 28 housed inside the tilling transmission case 13 and a transmission gear train. 25.

Next, based on FIG.
The structure of the forward / reverse rotation mechanism 27 will be described.

The forward / reverse rotation mechanism 27 of the rotary tilling unit 16 includes:
Ampulla 31 ₁ of the rear end of the left case half 31 and right case half 32 of the tiller for the transmission case 13, 32 ₁ intended to be accommodated in the pair of left and right positive supported coaxially ball bearings 33, 33 The rotating tilling shafts 34, 34 and one reverse rotating shaft 35 extending right and left through the right and left forward rotating tilling shafts 34, 34 so as to be relatively rotatable.

In front of the forward rotation tilling shafts 34, 34 and the reverse rotation shaft 35, a counter shaft 36 is supported via a pair of ball bearings 37, 37. A driven sprocket 38 fixed to a counter shaft 36 is connected to the transmission gear train 25 via the endless chain 28. First sprocket 39 fixed to counter shaft 36 and reverse rotation shaft 3
5 is attached to the endless chain 41
, So that the reverse rotation shaft 35 reverses in the same direction as the counter shaft 36 (the direction opposite to the running direction of the cultivator T)
Is driven.

On the other hand, a pair of first gears 42, 42 provided at both ends of the counter shaft 36 are provided with left and right forward tilling shafts 34, 3.
4 meshes with a pair of second gears 43 provided on the motor 4, respectively. Therefore, both forward tillage shafts 34, 34
6 and the reverse rotation shaft 35 in the normal direction (the same direction as the running direction of the cultivator T).

The gear ratio between the first sprocket 39 and the second sprocket 40 is such that the first gears 42 and 42 and the second gear 4
3, 43, so that the rotation speed of the reverse rotation shaft 35 and the rotation speed of the forward rotation tilling shafts 34, 34 are equal to each other, and slightly with respect to the rotation speed of the counter shaft 36. The rotation speed is reduced.

Next, the structure of the rotary tilling unit 16 will be described with reference to FIGS.

A reverse rotation shaft 35 penetrates the center of the forward rotation tilling shafts 34, 34 projecting left and right from the tilling transmission case 13, and a pair of left and right reverse rotation tilling shafts 46, 46 are provided at both left and right ends of the reverse rotation shaft 35. They are fitted and fixed by pins 47,47. The forward rotation tilling shafts 34, 34 are in the forward rotation direction, that is, the cultivator T
, The reverse tilling shafts 46, 46 are driven in the reverse direction, that is, in the direction opposite to the forward direction of the cultivator T.
The outer ends of the reverse tilling shafts 46, 46 are each provided with a gauge wheel 4
8, 48 are provided.

Forward tilling shafts 34, 34 and reverse tilling shaft 4
6, 46, the cultivating claws 49a to 61 formed of known claws curved to the rotation direction delay side and curved in and out in the axial direction.
49f, forward tilling shafts 34, 34 and reverse tilling shaft 4
There are provided three partition plates 50a to 50c made of circular flat plates arranged so as to be orthogonal to the axes of 6, 46.
The arrangement patterns of the tilling claws 49a to 49f and the partition plates 50a to 50c are symmetric with respect to the center line CL of the machine body.

That is, three forward tilling claws 49a to 49c are provided at 120 ° intervals on the forward tilling shaft 34 located on the side close to the center line CL via the mounting bracket 51a. The inverted tillage shaft 46 located on the far side is provided with three inverted tillage claws 49d to 49f at 120 ° intervals via mounting brackets 51b and 51c. Three partition plates 50 fixed to the reverse tilling shaft 46
The radius of a to 50c is set to be the same as the radius of the tilling nails 49a to 49f, and the tip of the inner partition plate 50a has no gap at the tip of one forward tilling nail 49c provided on the forward tilling shaft 34. The tip of the middle partition plate 50b is in contact with the reverse tilling shaft 4
6, the tip of the two inverted tilling claws 49d and 49e provided with no gap or slightly opposed to each other with a gap therebetween, and the tip of the outer partition plate 50c is provided with one inverted tilling provided on the inverted tilling shaft 46. It comes into contact with the tip of the tilling nail 49f without gap.

As described above, the forward tilling shaft 34 having the forward tilling claws 49a to 49c and the reverse tilling shaft 46 having the reverse tilling claws 49d to 49f are provided. The forward propulsion generated and the rear propulsion generated by the reverse tilling shaft 46 can be offset to prevent dashing of the body.

In addition, the grass dug during the tillage is
It may be entangled with 9a to 49f and further entangled with the forward tilling shafts 34, 34 or the reverse tilling shafts 46, 46,
In the cultivator T of this embodiment, the tips of the partition plates 50a to 50c are in contact with or approach the tips of the four tilling claws 49c to 49f, and are blocked by the tips of the partition plates 50a to 50c. 49a to 49d, the forward tilling shafts 34, 34 and the reverse tilling shafts 46, 46 are less likely to be entangled with grass. As a result, the increase in tillage resistance caused by the entanglement of grass,
It is possible to prevent a reduction in driving force and a variation in tillage depth, and to perform a stable tillage operation.

As shown in FIG.
Tilling claw 49 that rotates from back to front below
Obstacles 5 such as stones and wood chips with d-49f buried in the soil
3, the forward rotation of the reverse tilling claws 49d to 49f is prevented, so that the reverse tilling shaft 46 and the reverse tilling claws 49d to 49f are pushed rearward toward the position shown by the chain line due to the reaction of the driving torque. The operator operating the tiller T may feel uncomfortable due to the sudden braking force generated at that time.

However, according to the cultivator T of the present embodiment, as shown in FIG.
Before the f collides with the obstacle 53, the circular partition plates 50b, 5
0c abuts on the obstacle 53, so that the partition plate 50
b and 50c move diagonally upward and forward so as to get over the obstacle 53. As a result, the reverse rotation tilling claws 49d to 49f do not collide with the obstacle 53, and the occurrence of the sudden braking force described above can be prevented. Conversely, when the forward rotation tilling claw 49c collides with the obstacle 53 in the soil, a sudden increase in propulsion force may occur due to the reaction, but the forward rotation tilling claw 49c may be obstructed by the partition plate 50a. By preventing the collision with the object 53, the sudden increase in the propulsive force can be similarly avoided. Further tilling nails 49a ~
The partition plate 50 detects that 49f collides with the obstacle 53 and is damaged.
a to 50c.

In particular, one forward tilling claw 49c provided on the first mounting bracket 51a and two reverse tilling claws 49d and 49 provided on the second and third mounting brackets 51b and 51c.
Since the partition plates 50a and 50b are arranged at the portion facing e.
The partition plates 50a, 50b and the forward rotation tilling claw 49c are adjacent to each other and rotate in opposite directions to each other.
Can be prevented more effectively. Further, since the partition plates 50a to 50c are made circular, not only can the positional relationship with the tilling claws 49a to 49f be kept constant even if they rotate,
Can smoothly ride on the obstacle 53 when it comes into contact with the obstacle, and the tilling claw 49a due to the collision with the obstacle 53
４９49f can be reliably avoided.

Next, a second embodiment of the present invention will be described with reference to FIG.

The second embodiment is characterized by the shape of the tip of the partition plates 50a to 50c, and is different from that of the first embodiment.
While the tip of ~50c are simply cut, the tip of the partition plate 50a~50c of this example, ₁ double-edged shaped edge 50 or single-edged shaped edges 50 _2, are formed. Thus, the edge 5 is attached to the tip of the partition plate 50a-50c.
By forming 0 ₁ , 50 ₂ , it is possible not only to cut grass and prevent winding more effectively, but also to form a partition plate 50.
a-50c makes it easy to cut into the soil, and the tilling nails 49a-4
The tilling action of 9f can be prevented from being hindered.

Next, a third embodiment of the present invention will be described with reference to FIG.

In the third embodiment, the partition plate 50a of the first embodiment is used.
This corresponds to an increase in the radius of ５０50c, whereby the tips of the partition plates 50a〜50c project slightly outward in the radial direction than the tips of the tilling claws 49a〜49f.

Accordingly, when the cultivator T travels on a pavement road or the like, the tips of the partition plates 50a to 50c having a large radius roll on the road surface, and the tips of the tilling claws 49a to 49f having a small radius come into contact with the road surface. As a result, the generation of noise can be prevented, and damage to the tips of the tilling claws 49a to 49f can be prevented.

Next, a fourth embodiment of the present invention will be described with reference to FIG.

The fourth embodiment is characterized in that a fourth partition plate 50d is provided in addition to the three partition plates 50a to 50c of the first to third embodiments. Partition plate 5
Od is fixed to the tilling transmission case 13 and comes into contact with the tips of two forward tilling claws 49a and 49b provided on the forward tilling shaft 34 without any gap. The same edges 50 ₁ and 50 ₂ as in the second embodiment can be formed at the tip of the fourth partition plate 50d.

Since the tilling mission case 13 exists on the center line CL of the machine body, the forward tilling shaft 34 close to the center line CL is mounted on the forward tilling shaft 34 near the center line CL in order to reduce the untiled portion below the tilling mission case 13 as much as possible. The provided forward rotation tilling claws 49a, 49b are arranged close to the tilling transmission case 13 and the forward rotation tilling claws 49a, 49b.
The tips of a and 49b are curved toward the center line CL. Therefore, it becomes impossible to attach the partition plate that comes into contact with the forward rotation tilling claws 49a, 49b without any gap to the forward rotation tilling shaft 34. However, according to the present embodiment, the partition plate 50d is fixed to the tilling transmission case 13, so that the partition plate 50d is
The tips of the a and 49b can be contacted without any gap, and the collision between the forward rotation tilling claws 49a and 49b and the obstacle 53 can be prevented.

Next, a fifth embodiment of the present invention will be described with reference to FIG.

The front tine walking rotary tiller T has a single-cylinder engine E covered by a lower engine cover 61 and an upper engine cover 62, and a transmission case 63 is connected to a lower portion of the engine E.
Engine E crankshaft 64 arranged vertically
A cooling fan 65 is provided at an upper end of the transmission case 63, and a lower end thereof is connected via a clutch 67 to a drive shaft 66 supported vertically in the transmission case 63. Drive shaft 6
6 is a transmission case 63 via a forward / reverse rotation mechanism (not shown).
Is transmitted to a rotary tilling unit 68 provided at the lower end of the cultivator. A steering handle 70 extending upward from the rear of the vehicle body is detachably provided on a handle post 69 provided at the rear of the transmission case 63, and a resistance bar 71 is detachably provided on the handle post 69 via a bracket.

The rotary tilling section 68 of the cultivator T of the present embodiment.
Is the same as the structure of the rotary tilling unit 16 of the first to fourth embodiments described above, and therefore, the same functions and effects as those of the first to fourth embodiments can be obtained.

Although the embodiments of the present invention have been described in detail, the present invention is capable of various design changes without departing from the gist thereof.

For example, in the embodiment, the tilling claws 49a to 49f
Although a tan nail was illustrated as an example, another tilling nail such as a flower nail can be used instead of a tan nail.

The rotating partition plates 50a to 50c need to be circular.
The partition plate 50d fixed to 3 does not necessarily have to be completely circular in its entirety, but may have a circular portion that sinks in the soil.

[0054]

As described above, according to the first aspect of the present invention, the tilling shaft that is orthogonal to the tilling shaft extending left and right from the transmission case of the rotary tilling machine and adjacent to the rotation surface of the tilling claw provided on the tilling shaft is provided. Since the circular partition plate is provided, it is possible to prevent the grass from being pushed away by the partition plate and being wound around the tilling claw or the tilling shaft. In addition, when the partition plate comes into contact with obstacles such as stones and wood chips existing in the soil, the reaction force pushes the aircraft upward and the tilling claws do not collide with the obstacles. Of course, the rotating tilling claw is prevented from suddenly changing the propulsive force and the resistance of the fuselage due to the reaction force received from the obstacle, thereby preventing the operator from feeling uncomfortable.

According to the second aspect of the present invention,
Since the partition plate is mounted on the tilling shaft, the partition plate can be mounted so as to be adjacent to the rotating surface of the tilling claw without requiring a special mounting member.

According to the third aspect of the present invention,
Since the partition plate is mounted on the transmission case, the partition plate can be mounted without any trouble even when there is no mounting space on the tilling shaft.

According to the fourth aspect of the present invention,
Since the sharp edge is formed at the tip of the partition plate, it is possible to more effectively prevent the grass from being cut at the edge of the partition plate and being wound around the tilling nail or the tilling shaft.

According to the invention described in claim 5,
The tip of the partition plate is positioned radially outside of the trajectory of the tip of the tilling claw, so that the partition plate can be used as a wheel when traveling on paved roads, etc., and the tilling claw contacts the road surface Therefore, generation of noise and damage to the tilling nail can be prevented.

According to the invention described in claim 6,
Since the tilling claws are provided on the forward tilling shaft and the reverse tilling shaft that are coaxially arranged, the forward thrust generated by the forward tilling shaft and the backward thrust generated by the reverse tilling shaft are offset. Thus, dashing of the airframe can be effectively prevented.

According to the invention described in claim 7,
Since the partition plate provided on the reverse rotation tilling shaft is opposed to the cultivating claw provided on the normal rotation tilling shaft, the forward rotation cultivating claw and the partition plate are mutually reversed to effectively wind the grass around the forward rotation tilling claw. Can be prevented.

[Brief description of the drawings]

FIG. 1 is an overall side view of a rear tine walking rotary tiller.

FIG. 2 is an enlarged sectional view taken along line 2-2 of FIG. 1;

FIG. 3 is a view in the direction of arrows in FIG. 1;

FIG. 4 is an explanatory diagram of an operation during plowing

FIG. 5 corresponds to FIG. 3 according to a second embodiment of the present invention.

FIG. 6 corresponds to FIG. 3 according to a third embodiment of the present invention.

FIG. 7 corresponds to FIG. 3 according to a fourth embodiment of the present invention.

FIG. 8 is an overall side view of a front tine walking rotary tiller according to a fifth embodiment of the present invention.

[Explanation of symbols]

13 cultivator for transmission case (transmission case) 34 Forward tilling shaft (cultivating shaft) 46 reverse tilling shaft (cultivating shaft) 49A～49f tilling claws 50a~50d partition plate 50 _1, 50 ₂ Edge 63 transmission case E engine

Claims (7)

[Claims] 1. A rotary cultivator having tilling claws (49a to 49f) provided on tilling shafts (34, 46) extending right and left sides from a transmission case (13, 63) and rotationally driven by an engine (E). At right angles to the tilling axis (34, 46),
A rotary cultivator comprising a circular partition plate (50a to 50d) arranged so as to be adjacent to the rotation surface of 49f). 2. A tilling shaft (4)
The rotary tiller according to claim 1, wherein the rotary tiller is attached to (6). 3. The rotary tiller according to claim 1, wherein the partition plate (50d) is attached to the transmission case (13). 4. A partition plate (50 a to 50 c) tip sharp edges of features (50 _1, 50 ₂₎ that is formed, rotary tiller according to any one of claims 1 to 3. 5. The rotary cultivator according to claim 2, wherein the tip of the partition plate (50a to 50c) is located radially outside of the trajectory of the tip of the tilling claw (49a to 49f). . 6. A forward tilling shaft (34) extending from the transmission case (13, 63) to both axial sides and driven forward by the engine (E), and an axially outer side of the forward tilling shaft (34). And a reverse tilling shaft (46) which is arranged coaxially with the engine and driven reversely by the engine (E).
9. The rotary tiller according to claim 1, further comprising: 9a to 49f). 7. A tilling claw (4) provided on a forward rotation tilling shaft (34).
9a to 49c) and the reverse tilling shaft (4) between the opposing portions of the tilling claws (49d to 49f) provided on the reverse tilling shaft (46).
The rotary tiller according to claim 6, wherein the partition plates (50a, 50b) provided in (6) are located.