JPH0238564Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a forward and reversible tilling claw that is attached to a rotary tiller that is capable of forward and reverse rotation.

In rotary tillage, there are rotary tillers that can be used in forward and reverse directions for upcutting and downcutting depending on the type of crops to be planted or field conditions.

In such a forward/reverse rotary tiller,
In order to omit the work of changing the attachment direction of the tiller claws and further improve work efficiency, a tiller claw has been devised that has blades on the front and rear edges in the direction of rotation and can be used for both forward and reverse rotation.

FIG. 7 shows a tilling claw disclosed in Japanese Utility Model Publication No. 41-1925, which has an opening A in the straight part 32, a bent part 34 at the tip with a bent part 40 as a boundary, and is rotatable. Curved blade portions 38 and 39 are formed on the front and rear edges in the direction, and a mounting base 26 for mounting on a claw shaft that can be freely switched between forward and reverse directions is formed.

Since this conventional tilling claw is fixed to the claw shaft, even though it has blade parts 38 and 39 that can be used in both forward and reverse directions, each blade part 38 and 39 has a large driving angle.
Optimal driving is difficult. Therefore, it is conceivable to swing such tilling claws in the rotational direction to change the posture of the blade portion to be used so as to have an optimum driving angle.

However, in order to make the tiller claws swingable, it is necessary to satisfy conditions such as strengthening the attachment part and accurately regulating the swing angle.

This invention was developed in view of the problems of conventional nails,
The purpose of this product is to provide a tilling claw that can be used in both forward and reverse directions, and which can be swingably attached to the claw shaft and satisfies various conditions for good tilling work. is attached to a claw shaft that can be freely switched between forward and reverse directions, and has curved forward and reverse blades on its front and rear edges in the direction of rotation,
A tilling claw for both forward and reverse use, in which a bent part is formed from the tip of a straight flat part with a bent part as a border to form a rake face, and a punched hole is formed in the straight flat part, and the nail is attached to the mounting base. A swing hole is formed for attaching to the shaft so as to be swingable in the rotational direction, and stopper portions for setting a swing angle with respect to the pawl shaft are formed before and after the rotation direction of this swing hole, and each stopper The blade portion is formed from the top to the tip of the claw.

Embodiments of the present invention will be described below with reference to the drawings.

Figures 1 and 2 show the overall configuration of a forward/reverse rotary tiller 1, and this rotary tiller 1 is mainly composed of a machine frame 2, a tiller section 3, a tiller cover device 4, etc. It is attached to a tractor via a three-point linkage mechanism so that it can be raised and lowered freely.

The machine frame 2 has a central forward/reverse gear transmission mechanism 19.
A transmission case 7 and a side frame 18 are fixed to the outer end of each support arm 6. 8 is an input shaft protruding forward from the gear case 5; 9 is a transmission shaft that transmits the power of the input shaft 8 to the transmission case 7; 10 is a support frame extending rearward from the machine frame 2; It supports a gauge wheel 11, and its angle can be freely adjusted by a height adjustment mechanism 12.

The tillage cover device 4 includes a main cover 13 fixed to the machine frame 2, a rear cover 14 pivoted to the rear end of the main cover 13, and a pair of left and right side covers 15. is equalizing pressure adjustment mechanism 1
It is suspended by 6. Also, main cover 1
A reiki 17 is attached to the rear end of the tiller 3 so as to be able to adjust its angle, and is positioned between the rear cover 14 and the tilling section 3, and prepares the tilled soil into a fine surface layer and a sub-layer soil clod shape.

The tilling section 3 includes a pawl shaft 20 rotatably supported by the transmission case 7 and the side frame 18 about a horizontal axis, and a pawl mounting body 21 fixed to the pawl shaft 20.
The tiller shaft 20 has a large number of tilling claws 22 attached through the gear case 5, and the claw shaft 20 can be freely switched between forward and reverse directions by power from the gear case 5.

In FIGS. 3 to 6, the claw mounting body 21 has two mounting plates 23 and 24 facing each other, and a chevron-shaped stopper plate 25 interposed between one end thereof.
It is formed by welding three plates 23, 24, 25,
It is welded to the outer peripheral surface of the claw shaft 20, and the mounting base 26 of the tilling claw 22 is inserted between the two mounting plates 23 and 24, and fastened with a fastener 27.

The fastener 27 includes a fastening member 28 having a shaft portion 28a and a flange portion 28b, and a bolt 29 that passes through the fastener 27 and the mounting plate 24 and fastens them together.
A swing hole 26a is formed in the mounting base 26 of the tilling claw 22, and is fitted into the shaft portion 28a of the fastening member 28 so as to be swingable. 31 is the mounting base 26
and the flange portion 28b, the tilling claw 2
It provides resistance to the rotation of 2. The mounting plate 23 is formed with a hole 23a into which a flange portion 28b is inserted and supported, and the mounting plate 24 is formed with a groove 24a to prevent the nut 30 from rotating.

As shown in FIGS. 3 and 4, the tilling claws 22 are approximately elliptical in side view and approximately L-shaped in front view.
The base end side from the substantially flat straight part 32 is the mounting base 2
6. The side from the straight flat part 32 to the tip 33 is a bent part 34, and an opening A (punching hole) for soil relief is formed approximately in the center of the straight flat part 32, and the mounting base 2
6, in addition to the swing hole 26a, V-shaped contact surfaces (stopper portions) 35 and 36 are formed on the front and rear edges of the swing hole 26a in the rotational direction, and a rake face 37 is formed on the bent portion 34. has been done.

The tilling claws 22 are configured to be able to freely change their posture between a forward tilted posture A shown by a solid line in FIG. 3 and a reverse tilted posture B shown by a solid line in FIG. 1 and a phantom line in FIG.

That is, when the claw shaft 20 is rotated in the normal direction to till the down cut, the tilling claw 22 receives resistance during the first driving and swings around the fastener 27, causing the first contact surface 35 to come into contact with the stopper plate 25. As a result, when the direction of rotation of the pawl shaft 20 is switched and reversed, the tilling pawl 22 swings during the first driving and moves to the second position. The contact surface 36 contacts the stopper plate 25,
This results in a reverse tilted posture with a driving angle suitable for hard plowing. In both of these positions, the tilling claws 22 are in the intermediate position due to centrifugal force.
That is, although the nail shaft 20 attempts to assume a posture along the radial direction, the resistance force by the fastener 27 is large enough to prevent this, and the resistance force is set to be smaller than the driving reaction force. .

The abutment surfaces 35 and 36 are V-shaped with a large trapezoidal angle, and the area around the swing hole 26a in the mounting base 26 is widened, and the strength of the mounting base 26 is made sufficiently large. Board 25
By coming into contact with , the swing angle of the tilling claws 22 with respect to the claw shaft 20 is set.

Curved blade parts 38 and 39 are formed on the front and rear edges in the rotation direction of the straight part 32 and the bent part 34 from the tips of the contact surfaces 35 and 36 of the tilling claws 22 toward the tips of the claws, and the contact surfaces 38 and 39 There is no stepped portion between the blade portions 35, 36 and the blade portions 38, 39, and they are connected at large angle corners. The front blade part 38 has a shape that provides the best driving condition with less cutting resistance and less variation with respect to the field when the front blade part 38 is in the forward rotation tilted position A, and the rear blade part 39 is in the reverse tilted position B. It's summery.
In other words, the driving condition is almost the same as the blade of a conventional machete claw, and instead of changing the mounting direction of the machete claw, a front and rear blade part is formed on one claw, and the posture is automatically changed. This allows the front and rear blades to perform optimal cultivation similar to that of a machete.

As shown in FIG. 3, the opening (punching hole) A is formed from the vicinity of the mounting base 26 to the vicinity of the bent part 34, and has a substantially rice ball shape that becomes narrower toward the tip a. is the bending part 4
The position is approximately equal to 0. Therefore, the tilling claw 22 has an opening A formed at approximately the center of the straight flat part 32 over the entire length in the direction of the claw center line 42, and the soil can be held between the tilling claw 22 and the adjacent tilling claw 22. Even if the soil is crowded, all of the soil can escape through the opening A, and resistance from the sides can be eliminated.
In addition, the straight flat portion 32 has forward and reverse dual-purpose blade portions 38 and 39.
, the area is large and the rigidity is excessive, and the swing hole 26a, the bolt 29, the contact surface 35,
36 and the stopper plate 25, however, by forming the opening A, the rigidity of the straight flat part 32 is reduced and damage to each of the parts is prevented.

As a mounting structure that allows the attitude of the tilling claws 22 to be changed, the disc spring 3 shown in FIGS. 3 to 5 is used.
In addition to automatically performing the process using one resistor, it is also possible to perform the process manually.

For example, without using the disk spring 31, the flange portion 28b of the fastening member 28 is brought into direct contact with the tilling claw 22, and the tilling claw 22 is artificially set in the forward rotation tilted position A or the reverse tilted position B, and the bolt 29 is Tighten and secure the flange portion 28b.

The tilling claws 22 of the embodiment described above can be easily attached/detached and replaced by simply removing the fasteners 27, and
is large, so the soil reversal performance is good, and the mounting base 2
6 has been strengthened, so it has good durability against large torque.

According to the present invention described in detail above, the forward and reverse double-edged portion 3
8, 39, a tilling claw having a bent portion 34 and a punched hole A is attached to a swinging hole 2 on a claw shaft 20 that can be freely switched between forward and reverse directions.
6a so that it can swing freely, the blade part to be used can be swung to the optimum driving angle, and stoppers 35 and 36 are formed to set the swiveling angle. , the oscillating tiller claws can be accurately set to the optimum driving angle,
Moreover, since the stopper parts 35 and 36 are formed in the front and rear portions of the mounting base 26 in which the swing hole 26a is formed, they can be formed accurately and easily. Further, stopper portions 35, 36 are formed before and after the swing hole 26a, and arc-shaped blade portions 38, 39 are formed from the stopper portions.
, the area of the mounting base 26 can be increased, and the mounting base 26 can be strengthened. Furthermore, such a blade part 3
8, 39, bent part 34, punched hole A, swing hole 2
6a, stopper portions 35, 36, etc., can be produced extremely easily from a single plate by driving.

[Brief explanation of the drawing]

1 to 6 show an embodiment of the present invention, FIGS. 1 and 2 are a cross-sectional side view and a partially cross-sectional rear view of a forward/reverse rotary tiller, and FIGS. 3 and 4 are 5 is a cross-sectional view taken along the line -- in FIG. 3, FIG. 6 is a perspective view of a tilling claw, and FIG. 7 is a perspective view showing a conventional tilling claw. A...Forward tilted posture, B...Reverse tilted posture, 1
... Rotary tiller, 3 ... Tilling section, 20 ... Claw shaft, 21 ... Claw mounting body, 22 ... Tilling claw, 26
... Mounting base, 26a ... Swing hole, 27 ... Fastener, 32 ... Straight part, 34 ... Bent part, 35,
36...Abutting surface (stopper part), 37...Rake face, 38...Front blade part, 39...Rear blade part, 40...
Bent part, A...Opening part (punching hole).

Claims (1)

[Scope of utility model registration request] The mounting base 26 is attached to a claw shaft 20 that can be freely switched between forward and reverse rotation, and has a curved forward rotation blade portion 38 and a reverse rotation blade portion 39 on its front and rear edges in the rotation direction, and a curved blade portion 38 for forward rotation and a blade portion 39 for reverse rotation. It is a forward/reverse tilling claw having a bent part 34 with a rake face 37 formed on the bent part 40 as a border, and a punched hole A formed in the straight flat part 32. A swing hole 26a is formed for attaching to the claw shaft 20 so as to be swingable in the rotational direction, and this swing hole 26a
Stopper parts 35 and 36 are formed to set a swing angle with respect to the claw shaft 20 in the rotational direction of the claw, and the blade parts 38 and 39 are formed from each stopper part 35 and 36 toward the tip of the claw. This is a tilling claw that can be used in both forward and reverse directions.