JPH0347001A - Rotary tiller of normal and reverse rotation - Google Patents

Abstract

PURPOSE:To reduce soil clogging by inclining the center of a pivoting support shaft, crossing the center and the center of pawl shaft in such a way that a scooping part at the tip of a tilling pawl for treating residual tilling material arranged close to a frame is inclined toward the frame side. CONSTITUTION:A tilling pawl 13 having a knife part 23 for normal rotation and a knife part 24 for reverse rotation at both sides of rotation direction and a scooping part 25 at the tip is rockingly attached through a pivoting support shaft 20 in the direction of the center of pawl shaft to the normally and reversibly rotatable pawl shaft 10 supported through a bearing 9 by a frame 8. Then, the center C of a pivoting support shaft 20 is inclined and crossed to the center Y of the pawl shaft in such a way that the scooping part 25 at the tip of the tilling pawl 13 for treating residual tilling material, arranged close to the frame 8 is inclined toward the frame 8 side and the tilling pawl 11 is equipped rockingly around the pivoting support shaft 20. Consequently, in the case of either normal or reverse rotation, a clearance angle is formed at the side of the pawl rotation, pressure contact between the frame and the tilling pawl is prevented and soil clogging can be reduced.

Description

[Detailed description of the invention] (Industrial application field) The present invention relates to a forward/reverse rotary tiller.

(Prior art) A tilling claw has a claw shaft supported by a frame via a bearing and capable of forward and reverse rotation, and has a forward rotation blade portion and a reverse rotation blade portion on both sides in the rotation direction, and a grooved portion at the tip. A forward/reverse rotary cultivating device which is swingably provided with a pivot in the direction of the pawl axis has been proposed in Japanese Utility Model Publication No. 1-15281, etc., and has been put into practical use.

(Problems to be Solved by the Invention) By the way, the tilling claws for residual tillage treatment of the conventional forward/reverse rotary tilling device have a pivot having an axis parallel to the claw shaft axis, like other tillage claws. It was equipped with a support shaft that allowed it to swing freely between forward and reverse directions.

For this reason, tillage claws for processing residual tillage are in the form of so-called bent claws, so they can be used in forward and reverse directions (down-cut and up-cut).
In either case, the plowing area between the blade and the frame becomes compacted, resulting in severe soil clogging.
This leads to excessive rotary power consumption, and when attached to a tractor, the front and rear weight balance is lost.

Furthermore, if bacteria were living on the soil that had adhered to it, falling of the adhered soil to other locations would have caused the movement of the bacteria.

Such a situation must be avoided in rotary tilling because the power consumption is large, and
The torque on the pawl shaft is also large, which poses a problem in the durability of the pawl shaft and the pawl itself, which was one of the serious problems with forward and reverse rotary rotaries. By making it possible to give the blade of the tiller a clearance angle in the direction of rotation, it prevents soil compaction between it and the frame.
The purpose is to reduce soil clogging.

(Means for Solving the Problems) The present invention provides a claw shaft 10 that is supported by a frame 8 via a bearing 9 and that can be rotated in the forward and reverse directions, and has blade portions for forward rotation on both sides of the rotation direction.
3 and a reversing blade part 24, and a rake part 2 at the tip.
In order to achieve the above-mentioned purpose, the following technical aspects are implemented in a forward/reverse rotary tilling device that is equipped with tilling claws 13 and 14 having a diameter of 5 to be swingable via a pivot shaft 20 in the axial direction of the claw shaft. We are taking measures.

That is, in the present invention, the rake portion 25 at the tip of the tilling claw 13 for residual tillage processing, which is arranged close to the frame 8, is tilted toward the frame 8 side, so that the pivot shaft 20 thereof is tilted toward the frame 8 side. The tilling claw I3 is provided to be movable at tS around the pivot shaft 20, with the shaft center obliquely intersecting the claw shaft axis.

(Function) According to the present invention, as shown in FIG.
Rotating in the direction indicated by the arrow results in an upper cut, and rotating in the direction indicated by the arrow results in a down cut, in which the soil is gradually cut by the forward and reverse blade portions 23 and 24 formed on both sides of the tilling claw 13 in the direction of rotation. , and performs predetermined tilling by turning over with the rake portion 25 at the tip. In this case, each blade part 23 of the tilling claw 13,
24 is inclined backward in the rotational direction with respect to the centripetal line in either case of an upper cut or a down cut.

By switching the claw shaft IO between forward and reverse directions, the tiller claw tool 3 is swung and switched to a forward and reverse posture about its pivot shaft 20.

During this tilling, the tilling claws 13 for residual tillage processing, which are arranged close to the frame 8, are made swingable by a pivot shaft 20 having an axis that obliquely intersects with the claw shaft axis. Therefore, as shown in FIGS. 3 and 4, there are relief angles θl and θ2 with respect to the rotation direction, and the blade portion 23.
Even if 24 is tilted backwards with respect to the centripetal line, compaction of the soil against the frame 8 is prevented.

Regarding this point, in the prior art, as shown in FIGS. 15 to 18, the blade part of the claw 13' is
In particular, the compaction action by the bent portion 26' directly acts on the frame 8' side, leading to soil clogging here.

(Example) Embodiments of the present invention will be described in detail below with reference to the drawings.

In FIGS. 5 and 6 showing the overall configuration, reference numeral 1 denotes a rotary tiller, which is attached to the rear of a tractor 2 shown in FIG. 6 so as to be movable up and down by a three-point link 3.

Although the rotary tiller 1 is shown as a side drive type in this embodiment as shown in FIG. 5, it may be of a center drive type.

The rotary tiller l includes a support arm 5 having a PIC shaft 4, a side transmission case 6 and a side frame 7 attached to each outer end of the support arm 5 and extending downward (these are a frame 8 and a side frame 7). A bearing 9 is provided at the bottom of each of the side transmission case 6 and the side frame 7, and the pawl shaft 10 is rotatably rotated around its axis by the bearing 9 and supported by the frame 8. has been done.

The PIC shaft 4 is interlocked with a forward/reverse switching device provided in the center of the support arm 5, and the forward/reverse switching device is connected to the pawl shaft IO via a transmission means such as a gear or a chain in the side transmission case 6. It is linked.

The claw shaft 10 is swingably equipped with a tilling claw 13 for processing residual tillage and other tilling claws 14 via mounting brackets 11 and 12.

The tilling claws 13 for processing residual tillage are of a so-called bent shape,
It is arranged close to the frame 8 as shown in FIGS. 2 and 5.

The mounting bracket 11 for the tilling claws 13 for processing residual tillage has a pair of left and right bracket bodies 15 and 16, as shown in FIGS. .18. A mounting base on the base side of the tilling claw 13 is inserted between the pair of bracket bodies 15 and 16, and is tightened together with a disc spring 21 by a pivot shaft 20 having a collar 19 with a flange. The posture can be changed between the stopper parts 17 and 18.

In this embodiment, by tilting the left and right pair of bracket bodies 15 and 16 toward the frame 8 side and fixing them to the claw shaft 10,
The axis C of the pivot shaft 20 intersects the claw axis axis Y at an angle, and the tip of the tilling claw 13, which is swingably supported by the pivot shaft 20, is placed on the frame 8 side. oriented.

Note that the disc spring 21 provides a certain resistance to the tilling claws 13, and the resistance is such that when the claws 13 enter the soil, the tillage claws 13
When the claw 13 is allowed to swing and comes out of the soil, the resistance force is such that it will not return to its original state due to its inertia.
By simply changing the direction of rotation of the claw shaft 10 in the directions of arrows U and D, the posture of the tilling claws 13 is automatically switched to the normal rotation posture ot and the reverse rotation posture U1 shown in FIG. 1, and the respective postures DI and IJI
is maintained by stopper part 17,18.

Note that the resistance force of the disc spring 21 can be adjusted with a nut 2OA screwed into the threaded portion of the pivot shaft 20.

As shown in FIGS. 1 and 2, the tilling claw 13 has a base 22 having a mounting hole sandwiched between a pair of bracket bodies 15 and 16.
It has a forward rotation blade part 23 and a reverse rotation blade part 24 formed on both sides in the rotation direction, and a rake part 25 bent and formed on the tip side, and a hole T is formed in the center surrounded by these. The base portion 22 has a bending portion 26 .

Therefore, the tilling claws 13 have a forward rotation posture D1 and a reverse rotation posture 0.
1 and during tilling, even if the blade parts 23 and 24 are tilted backwards with respect to the centripetal line, clearance angles θ1 and θ2 are maintained on the trailing side in the rotational direction as shown in FIGS. 3 and 4. is formed in any direction of rotation, and here the frame 8
Minimize the compaction effect of the soil.

The tilling claws 14 and their mounting brackets 12 below the tilling claws 13 for residual tillage processing have approximately the same configuration as the tilling claws 13 for residual tillage processing, common parts are indicated by common symbols, and differences will be explained below. .

As shown in FIGS. 8 and 9, the first difference is that the pivot shaft 20 is parallel to the axis of the claw shaft lO.

The tilling claw 14 does not have a bending part 26 and has a forward rotation blade part 2.
3 and the blade edge curves of the reversing tooth portion 24 are approximately symmetrical from the mounting base 22 to the vicinity of the rake portion 24, and the angle of the contact portion facing each stopper portion 17, 18 on the mounting base 24 side is Both angles are the same, and therefore, the inclination angle γ++Tt of the tilling claws during forward and reverse rotation is the same.

The slots 24 of the tilling claws 14 are asymmetrical, and as shown in FIG. 8, the cutting angle α2 during reverse tilling is the same as the cutting angle α during forward tilling.
It is formed so that it is smaller than 1. That is, the folding line segment 27 of the scoop portion 24 and each line segment 〇-p, , o-Pt
The rake portion 24 is bent into a curved shape along the folding line 27 so that the angle formed by It's bent. Note that the line segments OP+ and OPt are the folded line segment 2
7 and each blade part 23, 24, intersection point P, h, and the claw axis 10
It is a line segment connecting the rotation center 0 point of . Cutting angle α1 is 30
~40°, and the cutting angle α2 is preferably about 20 to 30＠.

Further, in the above-mentioned example, the claws 13 and 14 each have a hole T formed in the blade portion, but this hole T may not be provided. The angle .theta. of the claw 13 with respect to the claw axis 10 is shown in FIG. 2, and it is effective to set the angle .theta.

In addition, in FIGS. 5 to 7, 28 is a tilling cover device, which includes a main cover 29 that covers the upper part of the tilling part, a front cover 30 that covers the front part, and a rear cover 31 that covers the rear part, The front cover 30 is made of a flexible material such as a rubber plate,
When cutting up, it covers the front of the tilling section as shown in Figure 7, but when cutting down, it engages and holds the mounting stay 32 as shown by the chain line in Figure 7.

In addition, in FIGS. 6 and 7, 33 indicates a rake.

The rear cover 31 is pivotally supported at the rear end of the main cover 30 by a hinge 34, and is pressed in the direction of contact with the ground by a resilient spring means 35 shown in FIG.

Furthermore, the tillage cover device 2B also includes a side cover 36.

Referring to FIGS. 7, 12, and 13, the main cover 2
9 is an arc cover 37 made of rubber or the like to prevent soil from adhering.
The arcuate cover 37 has a metal fitting 39 on its inner surface by an H-shaped molded body 38 made of an elastic material such as rubber.
, is attached to the main cover 29 by fasteners 40.

That is, a mounting hole 41 is formed in one flange 38A of the molded body 28, and a flange fitting 39 is fitted into this mounting hole 41, so that the push-in type stopper 40 is inserted into the hole 29A of the main cover 29 and the fitting 39. It is attached by pushing it into the hole 39A and fixing it, while the arcuate cover 37 is attached to the other flange 38B by gluing or the like.

When the arcuate cover 37 is attached to the main cover 29 by such means, damage to the arcuate cover 37 due to elastic deformation of the web 38C of the molded body 38 can be further reduced.

The molded body 38 may be provided along the left-right direction (longitudinal direction of the nail shaft) as shown in the figure, or may be provided along the front-rear direction.
It is desirable to have more than one number. Further, the metal fittings 39 and the fasteners 40 have a plurality of fixing locations spaced apart from each other in the longitudinal direction of the molded body 38.

FIG. 14 shows an example of attaching the circular arc cover 37 to the side cover 36. A flat par 41 is attached to the inner surface of the side end of the main cover 29 with bolts 42, and this flat par 4
1 and the arcuate cover 37, a groove-shaped molded body 43 made of rubber or the like is provided to attach the cover 37, and this also prevents the cover 37 from being torn.

In FIG. 6, 44 is a rear two-wheel stay, which is provided with a pair of left and right tail wheels 45 by support rods 46 and the like.

Since soil may adhere to and grow on the inner surface of the tail wheel 45, an elastic cap body 4 in the form of a rubber cap is used as shown in FIG.
7 is removably attached to the inner surface of the tail wheel 45, and a protrusion 48 is formed between the cap body 47 and the tail wheel 45 to form a space 48 on the outer periphery and inside, thereby reducing ground resistance and rolling resistance. As shown in FIG. 11, the flange portion 47A of the cap body 47 is elastically deformed between the signs S, and the main body portion 47B is vibrated, thereby preventing the adhesion and growth of soil.

(Effects of the Invention) The present invention is as described above, and the present invention provides a method in which the rake portion at the tip of the tilling claw for processing residual tillage disposed close to the frame is inclined toward the frame side. The axis of the pivot shaft is provided so as to intersect with the axis of the claw shaft, and the tilling claws are swingable around the pivot shaft. A relief angle is formed on the rear side, reducing the possibility of soil being pressed or consolidated against the frame side.
Prevents soil clogging and soil adhesion.

This reduces the chance of losing the front and rear weight balance during rotary work, prevents the transfer of bacteria, and saves power consumption. It also reduces the torque of the pawl shaft and increases the durability of the pawl shaft and the pawl itself. less likely to be damaged.

FIGS. 15 and 16 are conventional examples corresponding to FIGS. 1 and 2 of the embodiment of the present invention, and FIGS. 17 and 18 are FIG. 3 which is an operational view of the embodiment of the present invention. This is a conventional example corresponding to FIG.

In the conventional example, the tilling claw 13° for residual tillage processing is the claw axis lO°.
The tilling claws 13'' are swingably mounted on the mounting bracket 11' with a pivot shaft 20'' parallel to the axis of the claw shaft, so that the tilling claws 13'' are tilted backwards with respect to the centripetal line O-0 during tilling. Therefore, the blade part is rotating on a plane parallel to the frame 8', and there is no relief angle after the bending part 26', so that the upper pressing force F' on the frame 8' side as shown in FIG. When this occurs, this is compacted by the rear body portion 13'A, leading to adhesion and growth of soil.

The present invention provides relief angle θ1. θ2, the blade acts to scrape off soil with the cutting edge (see Fig. 3), and the bent portion 26
Even if the upper pressing force F acts on the rear body 138, the clearance angle θ2
There is no need to compact the soil.

[Brief explanation of drawings]

The drawings show an embodiment of the present invention and a conventional example. FIG. 1 is an enlarged view of the embodiment of the present invention, FIG. 5 is an enlarged view taken along line X--X, and FIG. , FIG. 3 is an explanatory diagram of the action taken along line A-A in FIG. 6 is a side view, FIG. 7 is a side cross-sectional view showing the relationship between the tiller and its cover device, and FIG. 8 is an enlarged view taken along line X-X in FIG. , FIG. 9 is an elevational view of FIG. 8, FIG. 10 is a rear sectional view of the gauge wheel, FIG. 11 is an explanatory diagram of the function of the gauge wheel, FIG. 12 is an enlarged sectional view of the Y section in FIG. 7, FIG. 13 is an exploded perspective view showing a part of FIG. 12;
FIG. 14 is an enlarged sectional view of the Y1 section in FIG. FIG. 18 is an explanatory diagram of the action taken along line B'-B' in FIG. 15. 8... Frame, 9... Bearing, 10... Claw shaft, 1
1.12... Mounting bracket, 13.14... Tilling claw, 20... Pivoting shaft, 23.24... Blade portion, 25...
...Scooping part.

Claims (1)

[Claims] (1) A claw shaft (10) supported by a frame (8) via a bearing (9) and capable of forward and reverse rotation has a forward rotation blade part (23) and a reverse rotation blade part (24) on both sides of the rotation direction. and a rake part (25) at the tip.
) in a forward and reverse rotary tilling device which is swingably provided via a pivot shaft (20) in the direction of the claw shaft axis. The rake part (25) at the tip of the claw (13) is attached to the frame (
8) The axis of the pivot shaft (20) is provided so as to cross the axis of the claw shaft at an angle so that the tilling claw (13) can be tilted toward the side. A forward and reverse rotary tilling device characterized by being able to swing freely in the forward and reverse directions.