JPS6325923Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a tilling section structure of a forward/reverse rotary.

A rotary tiller towed behind a tractor has a tiller section consisting of a claw shaft installed horizontally in the left-right direction and a plurality of rows of claws arranged on the claw shaft, and the rotation of the tiller section allows it to spread the field. It is something to cultivate.

The direction of rotation of this tiller is divided into forward rotation (down cut) in which the claw shaft rotates in the same direction as the rotation direction of the drive wheel of the tractor being pulled, and reverse rotation (up cut) in which the claw shaft rotates in the opposite direction to the drive wheel. It is used differently depending on the purpose of use.

In the forward/reverse rotation rotary, the direction of rotation of the pawl shaft must be switched by a forward/reverse switching device, and the direction in which the pawls are attached must be reversed, making the job of replacing the pawls very troublesome.

Therefore, a claw has been devised in which blades are provided on both front and rear edges of the claw so that the claw can be used in either forward or reverse directions without having to be replaced. However, the angle at which the nail hits the ground (the angle between the tangent of the blade and the ground when the nail touches the ground)
There is an optimum value, and according to this value, the claw is tilted backward in the direction of rotation. Therefore, in order to maintain this optimum value so that it can be used for both forward and reverse purposes,
This resulted in very wide, spade-mark-shaped claws, which increased tillage resistance, making it difficult to put them into practical use.

In addition, the tips of the claws are curved laterally to the left and right in order to improve the turning over and lifting of tilled soil.
The ground penetration angle or rake angle of this curved portion (the angle formed by the curved portion and the tangent to the rotation locus circle of the curved portion) is different in forward and reverse directions. In other words, in normal rotation, the claws flip up the tilled soil backwards,
The penetration angle (rake angle) should be shallow. However, in reverse rotation, the tilled soil is thrown forward, so in order to send the same amount of tilled soil backwards as in normal rotation, it is necessary to deepen the penetration angle and push up a large amount of soil. Using the fixed double-edged claw, it is extremely difficult to vary the biting angle between forward and reverse rotations.

The present invention was devised in view of the above-mentioned problems, and maintains the optimum driving angle by swinging the pawl relative to the pawl shaft without changing the pawl during forward and reverse rotation, and also prevents bending. It is an object of the present invention to provide a tilling section structure of a forward/reverse rotary rotary which can maintain the bite angle of the section at an optimum value in forward and reverse directions. Therefore, its characteristics are:
In a tilling section of a rotary rotary having a pawl provided in a radially outward protruding shape on a pawl shaft horizontally installed in the left-right direction,
The pawl shaft is provided for forward and reverse drive, and has a pawl attachment part that protrudes radially outward.The pawl has a blade on the front and rear rods in the rotation direction, and the tip of the pawl can be driven in one direction in the left and right direction. In addition to being formed into a curved part, the base of the claw is pivotably supported on the claw mounting part so that the leading edge in the direction of rotation of the claw is in a trailing inclined position during forward and reverse rotation. and the pawl attachment portion are provided with stopper portions that engage with each other to maintain the tilted position, and in the tilted position, the angle at which the curved portion bites into the field differs depending on whether it is in the forward or reverse direction.

Hereinafter, embodiments of the present invention will be described in detail based on the drawings.

FIG. 1 shows an outline of a forward/reverse rotary rotary 1 employing the present invention, and the rotary 1 is attached to the rear of a tractor 3 via a three-point linkage mechanism 2 to be towed. A tilling section 4 is provided at the lower part of the rotary 1, and the tilling section 4 has a claw shaft 5 installed horizontally in the left-right direction.
and a large number of pawls 6 provided on this pawl shaft 5 in a radially outwardly protruding manner. The upper part of the tilling section 4 is covered with a front cover 7, a main cover 8 and a rear cover 9. A power receiving gear box 10 is provided on the upper part of the rotary 1, and power is transmitted from the gear box 10 to the pawl shaft 5 via a side drive device 11. This gearbox 10 includes a power transmission shaft 1
Power is transmitted from the PTO shaft 13 of the tractor 3 via the PTO shaft 13 of the tractor 3. Further, the gearbox 10 is provided with a forward/reverse switching device, and the claw shaft 5 is rotated in both forward and reverse directions by the switching device.

Here, forward rotation (down cut) means that the tractor 3
When the rear wheel 14 rotates in the direction of arrow a in FIG. 1 and the rotary 1 moves in the direction of arrow F, the pawl shaft 5 rotates in the direction of arrow b (same direction as the rear wheel). (Upcut) means that the rear wheel 14 rotates in the direction of arrow a and the pawl shaft 5 rotates in the direction of arrow c.

FIGS. 2 and 3 show details of the tilling section 4, and are a first embodiment of the present invention.
A large number of pawl mounting portions 15 are arranged on the pawl shaft 5 and protrude radially outward. The pawl attachment portion 15 consists of a pair of brackets 16 and 17 that face each other in the left-right direction, and a parallel gap 18 is provided between the brackets 16 and 17, into which the pawl 6 is loosely fitted. One bracket 16 is provided with a bolt insertion hole 19 parallel to the pawl axis at the center in the front-rear direction, and the other bracket 17 is provided with a sleeve insertion hole 20 coaxial with the insertion hole 19. There is. At the base of the parallel gap 18, there is a chevron-shaped stopper piece 2 having an apex in the radially outward direction of the claw axis and at the center in the longitudinal direction of the bracket.
1 is provided. If _the chevron-shaped inclination angle (α ₁ ) (α ₂ ) of the stopper piece 21 is defined as shown in FIG. , is formed to be smaller than the leading side inclination angle (α ₂ ).

The claw 6 has blade portions 22, 22 on the front and rear edges in the rotation direction, and the blade portions 22, 22 are formed into a curved shape.
The tip of the claw 6 is cut off perpendicularly to the center line 23 of the claw, and the edge of the base 24 of the claw is formed into an equilateral chevron shape. There is an oval hole 2 in the center of the claw 6.
5 have been established. A sleeve through hole 26 is formed on the center line 23 of the claw base 24. Claw 6
The distal end thereof is perpendicular to the claw center line 23 and is formed into a bent portion 27 curved in one direction in the left and right direction.
Thus, the claws 6 are formed symmetrically with respect to the center line 23.

The sleeve through hole 26 of the claw 6 is located at the claw attachment portion 1.
Insert the claw 6 into the gap 18 between the brackets 16 and 17 so that it aligns with the sleeve insertion hole 19 of the bracket 5.
A flanged sleeve 28 is inserted through both the holes 20 and 26, a bolt 29 is inserted through the sleeve 28 so as to protrude from the bolt insertion hole 19, and a nut 30 is screwed into the protrusion. In addition, sleeve 28
A disc spring 32 is interposed between the flange portion 31 and the side surface of the claw 6. The nut 30 is fitted into a T-groove 33 formed in the end face of the bracket 16 and cannot be rotated relative to the other. By tightening the bolt 29, the pawl 6 is resiliently biased by the disc spring 32 and pivotably supported by the brackets 16 and 17. The tightening force of the disk spring 32 is such that when the pawl shaft 5 rotates, the pawl 6 does not rotate due to centrifugal force, but when the pawl 6 collides with the ground, it rotates. It has been adjusted.

However, the swinging range of the pawl 6 is restricted by the contact between the sloped surface of the pawl base 24 and the slope of the stopper piece 21, and the pawl base 24 and the stopper piece 21 constitute a stopper portion 34 here.

Next, the effects of the first embodiment of the present invention will be explained. When the claw 6 rotates forward (in the direction of arrow b in FIG. 3), the claw 6 collides with the ground 35 of the field, so that the blade portion 22 on the leading side in the rotation direction is rotated as shown by the solid line in FIG.
The claw base 24 swings to a backward tilted position.
This inclined posture is maintained by the stopper part 34 consisting of the stopper piece 21 of the claw attachment part 15. In this inclined position, the tangent line 3 of the blade portion 22
The curve of the blade portion 22 is determined so that the driving angle (β ₁ ) between the blade 6 and the ground 35 is an optimum value. In addition, in this inclined position, the stopper part 34 is used to adjust the pawl swing angle so that the rake angle (or rake angle) θ ₁ between the tangent 38 of the rotation locus circle 37 of the bending part 27 and the bending part base line 39 is optimal. Regulations are in place. Further, while the claw 6 is separated from the ground 35 and idles, the claw 6 is elastically supported by the disc spring 32 so as not to swing due to centrifugal force, so that the claw 6 does not rattle. Therefore, this claw 6 exhibits the same tillage effect as a normal hatchet claw.

Next, when it is reversed, it will be in an inclined position as shown by the imaginary line in FIG. This reversal of forward/reverse tilt posture is
This is done automatically when the claw 6 collides with the ground 35. That is, the tightening force of the disc spring 32 is adjusted to a strength that allows the claw 6 to swing against the ground impact force. This reverse tilted posture is maintained by the contact between the stopper piece 21 of the stopper part 34 and the claw base 24, and also because the chevron-shaped inclination angle (α ₁ ) (α ₂ ) of the stopper piece 21 differs between forward and reverse rotations. ,
The tilted posture is steeper than during forward rotation. Therefore, the penetration angle θ ₂ of the claw bent portion 27 becomes larger than the penetration angle θ ₁ during normal rotation, and during reverse rotation, a larger amount of tilled soil is dug in and thrown up than during normal rotation. This means that the same amount of tilled soil can be sent backwards as when rotating forward. In this reverse tilted posture, the driving angle (β ₂ ) of the blade portion 22 is also different from that in normal rotation, but since the driving angle (β) has a predetermined range, the curve of the blade portion 22 is adjusted so that it falls within this range. has been decided.

Note that the hollow hole 25 in the center of the claw 6 has the effect of preventing clogging of tilled soil.

According to the first embodiment, even if the claw 6 is double-edged, the claw 6 swings, so even if the width is narrowed, the driving angle (β) cannot be maintained at the optimal condition. Therefore, since the width of the claws 6 is narrow, tilling resistance does not increase.

Further, since the swinging angle of the pawl 6 is made different between forward and reverse rotations by the stopper portion 34, the bite angle θ of the bent portion 27 can be maintained at an optimum condition for each of the forward and reverse rotations.

In the case shown in FIG. 4, the chevrons of the stopper piece 21 and the claw base 24 are both symmetrical so that the angle δ is equiangular, and the angle of inclination of the claw 6 is the same in both forward and reverse directions. By making the bending direction of the claw 27 inclined (γ) with respect to the claw center line 23, it is intended to obtain the same effect as in the first embodiment.

It should be noted that the present invention is not limited to each of the above-mentioned embodiments; the pawl attachment portion may be of a disc type, and the stopper portion may have any configuration.

According to the present invention, there is no need to replace the claws in forward and reverse rotations, and the forward and reverse postures are automatically obtained, thereby improving work efficiency. Since the claws swing, the width of the claws can be narrowed, so tillage resistance does not increase. In addition, since the angle of penetration of the bent portion is different in forward and reverse rotations, the flow of tilled soil is optimized, which provides great practical effects.

[Brief explanation of the drawing]

The figures show embodiments of the present invention, in which Fig. 1 is a partially sectional side view of the rotary, Fig. 2 is a sectional view of the first embodiment, Fig. 3 is a side view of the first embodiment, and Fig. 4 is a side view of the rotary. Second
FIG. 3 is a side view showing the shape of the claw of the example. 4... Cultivating part, 5... Claw shaft, 6... Claw, 15...
...Claw attachment part, 22...Blade part, 24...Base, 27
...Bent part, 34...Stopper part, θ...Piece angle (rake angle).

Claims (1)

[Scope of utility model registration request] In the rotary cultivating section 4, which has a pawl 6 provided in a radially outwardly projecting manner on a pawl shaft 5 horizontally installed in the left-right direction, the pawl shaft 5 is provided so as to be freely driven in forward and reverse directions.
The claw 6 has a claw attachment part 15 that projects in the radial outward direction, and the claw 6 has blade parts 22, 22 on the front and rear edges in the rotation direction, and the tip of the claw 6 has a curved part 27 that curves in one direction in the left and right direction. At the same time, the claw base 24 is pivotably supported on the claw attachment part 15 so that the leading side blade part 22 in the rotation direction of the claw 6 is in a trailing inclined position during forward and reverse rotation, and the base of the claw 6 is 24 and the claw attachment part 15 are provided with a stopper part 34 that engages with each other to maintain the inclined position.
A tilling section structure of a forward-reversing rotary, characterized in that the penetration angle θ of the bent portion 27 into the field differs between forward and reverse rotations.