JPS6239605Y2 - - 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 mounting 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 in both forward and reverse directions.

These forward and reverse tilling claws must have blades on the front and rear edges, so the straight flat part has a large area.
When tilling, the soil is held between adjacent tilling claws,
The driving resistance increases, reducing the tilling efficiency and the durability of the tilling claws. Therefore, it is conceivable to form an opening in the center of the straight flat part to allow the soil to escape and reduce the driving resistance. This also increases the strength and reduces the weight of the tilling claws.

Japanese Utility Model Publication No. 41-1925 discloses a tiller in which blades are formed on the front and rear edges of the tiller and an opening is formed in the straight flat part.

However, as shown in Fig. 8, the tilling claws having such an opening catch grass, straw, etc. in a dogleg shape on the front and rear inner circumferential edges a and b facing the opening A, and the grass, straw, etc. , straw, etc. act as resistance to tilling, making it difficult to expect a significant improvement in tillage efficiency.

In view of these various problems, the present invention has blades on the front and rear edges and an opening on the straight flat part,
By forming blades on the front and rear inner peripheral edges facing this opening, it is possible to cut grass, straw, etc. that try to get caught in the opening, even if the tiller is rotated in either the forward or reverse direction. It is an object of the present invention to provide a tilling claw that can be used in both forward and reverse directions and can reduce tillage resistance.

The features of the present invention to achieve this purpose are that the claw is attached to a shaft that can be freely switched between forward and reverse rotations, and has a forward rotation blade part and a reverse rotation blade part on the front and rear edges in the direction of rotation. In the forward/reverse tilling claw which has an opening formed in a straight flat part, blades are respectively formed on the front and rear inner peripheral edges facing the opening.

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

FIG. 1 shows the overall configuration of a forward/reverse rotary tiller 1. This rotary tiller 1 is mainly composed of a machine frame 2, a tiller section 3, a tiller cover device 4, and the like. It is mounted so that it can be raised and lowered via a point linkage mechanism.

The machine frame 2 has support arms 6 protruding from the left and right sides of a central gear case 5 incorporating a forward and reverse gear transmission mechanism, and a transmission case 7 and a side frame 18 are fixed to the outer ends of each support arm 6. It is configured. 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 11.

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 lump-like shape under the surface field soil.

The tilling section 3 includes a claw shaft 20 rotatably supported by the transmission case 7 and the side frame 18 about a horizontal axis, and a claw mounting body 21 fixed to the claw 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. 2 to 4, 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 hole 26a is formed in the mounting base 26 of the tilling claw 22, and it is rotatably supported by the shaft 28a of the fastening member 28. It is located between the base portion 26 and the flange portion 28b, and provides resistance to rotation of the tilling claws 22. The mounting plate 23 has a hole 23 into which the flange portion 28b is inserted and supported.
A is formed in the mounting plate 24, and a groove 24a is formed in the mounting plate 24 to prevent the nut 30 from rotating.

As shown in FIGS. 2 and 3, the tilling claws 22 are approximately elliptical in side view and approximately L-shaped in front. The side from the portion 32 to the tip 33 is the bent portion 34
An opening A for soil release is formed approximately in the center of the straight flat part 32, and the mounting base 26 has a V-shaped contact surface 35 on its edge in addition to the hole 26a.
36 is formed, and a rake face 37 is formed on the bent portion 34.

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. 2 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 drive and rotates around the fastener 27, causing the first contact surface 35 to come into contact with the stopper plate 25. As a result, when the rotation direction of the pawl shaft 20 is switched and reversed, the tilling pawl 22 is rotated by the first driving, and the second abutment surface 36 is brought into contact with the stopper plate 25. This results in an inverted tilted posture suitable for intensive cultivation. In both these positions,
The tilling claws 22 tend to assume an intermediate position due to centrifugal force, that is, a position along the radial direction of the claw shaft 20, but the resistance force by the fasteners 27 is large enough to prevent this. The resistance force is set to be smaller than the driving reaction force.

Blade portions 38 and 39 are formed on the front and rear edges of the straight flat portion 32 and bent portion 34 of the tilling claw 22 in the rotation direction, and the double blade portions 38 and 39 have an arc shape, and the front blade portion 38 has a forward rotation tilted position. When the rear blade part 39
The shape is such that the best driving condition is achieved in the field when the blade is in the reverse tilt position B. That is,
The driving condition is almost the same as that of the conventional machete blade, and instead of changing the installation direction of the machete,
By forming front and rear blades on each claw and automatically changing the posture, the front and rear blades can perform optimal cultivation similar to the machete claw.

The opening A of the tilling claw 22 is formed up to this side of the bent part 40 at the boundary between the straight flat part 32 and the bent part 34, and is located on the front and back sides in the rotational direction at the inner peripheral edge facing the opening A, that is, front and back inside. Peripheral parts a and b are blades B and C
is formed. However, the blades B and C may be continuous around the entire circumference of the opening A. As shown in FIG. 5, the front blade B and the rear blade C have a rake angle in the same direction as the front blade part 38 and the rear blade part 39, respectively, and as shown in FIG. , 39 with rake angles in opposite directions, or a mountain shape with rake angles on both sides as shown in FIG. Instead, it has sharp edges, so
Grass, straw, etc. that have entered the opening A can be cut, and there is no need to rotate the grass or straw while it is caught.

The function of cutting grass, etc. of the front and rear blades B, C is almost the same as that of the front and rear blade parts 38, 39, and even if the grass, etc. gets caught in the front and rear blades B, C, it receives a great deal of resistance from the surrounding soil. Therefore, cutting can be performed reliably without any accompanying rotation.

In the present invention, the tilling claws 22 may be fixed to the mounting body 21 at a position where the attitude is changed, or may be fixed in a manner that the attitude cannot be changed.

According to the present invention described in detail above, the front and rear blades B and C are formed on the front and rear inner peripheral edges a and b facing the opening A formed in the straight flat part 32 in order to prevent soil entrainment. Regardless of whether the tilling claws 22 are rotated in the forward or reverse direction, grass, straw, etc. that have entered the opening A can be reliably cut, preventing an increase in tilling resistance due to catching of grass, etc. It is possible to significantly improve efficiency.

[Brief explanation of the drawing]

Figure 1 is a cross-sectional side view of a forward/reverse rotary tiller.
Figure 2 is a sectional view of the tilling part, Figure 3 is a front view of the tilling part, Figure 4 is a sectional view taken along the - line in Figure 2, and Figures 5 to 7 are cross-sectional views showing three examples of tilling claws. The top view and FIG. 8 are cross-sectional views showing a conventional tilling claw. 1... Rotary tiller, 3... Tilling section, 20...
...Claw shaft, 21...Claw mounting body, 22...Pilling claw,
26... Mounting base, 27... Fastener, 32...
Straight part, 34... Bent part, 38... Front blade part, 39
...Rear blade, A...Opening, B...Front blade, C...
Rear blade, A...forward tilted posture, B...reverse tilted posture.

Claims (1)

[Scope of utility model registration request] It is attached to a claw shaft 20 that can be freely switched between forward and reverse rotations, and has a forward rotation blade part 38 and a reverse rotation blade part 39 on its front and rear edges in the rotation direction, and has an opening A formed in its straight flat part 32. In the reversing dual-purpose tilling claw, the front and rear inner peripheral edges a and b facing the opening A are provided with blades B and C.
A tilling claw that can be used in both forward and reverse directions.