JPH0240723Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to an improvement of a tilling claw attachment device for both forward and reverse use.

Conventionally, as a mounting device for a tilling claw that can be used in both forward and reverse directions, a tilling claw that has vertical blades on both sides of the rotation direction is attached to a holder fixed to the rotating shaft (claw shaft) of a rotary tiller so that it can swing back and forth in the rotation direction. A configuration is provided.

However, the tiller claws for both forward and reverse use are generally formed into a substantially elliptical plate-like body that is symmetrical in the direction of rotation.
In addition, since the swing angle was set to be the same in the front and rear directions, the rotational diameter of the pawl during forward and reverse rotations was the same, resulting in the following inconvenience.

That is, reverse tilling work is generally performed to finely crush topsoil (shallow tilled soil), but since the machine advances while pushing the soil forward, it requires more horsepower than when working in forward rotation. For this reason, it becomes necessary to extremely reduce the traveling speed of the machine during reversing work, resulting in the inconvenience of lowering work efficiency.

Therefore, the present invention has a roughly elliptical plate-shaped tilling claw having vertical blades on both front and rear sides in the rotation direction, which is attached to a holder fixed to the rotation shaft of a rotary tiller so as to be able to swing back and forth in the rotation direction. A side of the tilling claw near the rocking base end is brought into contact with the holder or the rotating shaft side to regulate the swinging angle of the tilling claw to a predetermined angle, and the tilling claw contact portion on the holder or rotating shaft side is configured to The tilling claws are positioned at an asymmetrical position in the front and back with reference to the imaginary line l connecting the rocking center P ₁ of the tilling claws and the rotation axis center P ₂ so that the rotation radius when the tilling claws rotate in reverse is smaller than the rotation radius when rotating in the forward direction. In addition, the vertical blade portion on the working side during reverse rotation is formed into a substantially straight shape, thereby making the swinging angle of the claw different during forward rotation and reverse rotation, respectively, and changing the rotation diameter of the claw during each plowing. This is an attempt to solve the above-mentioned conventional disadvantages.

The structure of the present invention will be explained with reference to an embodiment shown in the drawings. Reference numeral 1 denotes a rotating shaft of a rotary tiller (not shown) that can be rotated in both forward and reverse directions; It can also be installed with the left and right sides of the flange reversed.

Reference numeral 2 denotes a holder fixed to the rotating shaft 1, and a tilling claw 3 having vertical blade portions 3a, 3b on both front and rear sides in the rotational direction is attached to this holder 2 via a fulcrum bolt 4 and a nut 5 so as to be swingable back and forth in the rotational direction. has been done. By the way, as shown in the figure, the tilling claw 3 has a front-rear asymmetrical shape, and the vertical blade part 3a on the action side (left side in FIG. ) vertical blade part 3
b is formed into a substantially straight line. Reference numeral 6 denotes a pressure member such as a disc spring fitted to the fulcrum bolt 4, and the pressure member 6 applies an appropriate frictional force to the tilling claws 3 to prevent them from swinging unnecessarily.

7 and 8 are stoppers located on both the front and rear sides of the holder 2 and fixed to the rotating shaft 1;
The swing angle of the tilling claw 3 is regulated to a predetermined angle by bringing the side of the tilling claw 3 closer to the swinging base end into contact with the tiller claw 3.

By the way, the contact parts a and b of the stoppers 7 and 8 with respect to the tilling claw 3 are located at asymmetrical positions in the front and rear with respect to the imaginary line l connecting the swing center P _{1 of the tilling claw 3} and the rotation axis center P ₂ as a reference. The rotation radius R ₁ of the claws 3 during reverse tillage is configured to be smaller than the rotation radius R ₂ during normal rotation tillage.

The one shown is a rotation axis 1 perpendicular to the above virtual line l.
Contact points a and b of stoppers 7 and 8 from the center line l' of
The height of the stopper members is different so that the distance to the stopper 7 side _S1 is small and the distance to the stopper 8 side _S2 is large, but the installation position of the stoppers 7 and 8 (from the virtual line l) distance) may be changed.

In this embodiment, the stoppers 7 and 8 are constructed as separate members from the holder 2 or the rotating shaft 1, respectively. It can also be configured to restrict the corners, in which case the holder 2
Or depending on the shape of the rotating shaft 1, the front and rear contact areas a, b
This is to make the swing angles different during normal rotation and during reverse rotation.

Further, even when the stopper type shown in the figure is adopted, the stoppers 7 and 8 may be constructed so that their mounting positions can be adjusted freely by a method such as bolting instead of being fixed by welding.
It may be installed either on the side or on the holder 2 side.

In the configuration as described above, when the rotary shaft 1 of the rotary tiller is now rotated (reversely rotated) in the direction of the arrow x as shown in FIG. As a result, the rotation angle of the tilling claws 3 is regulated to α _{1 .}
becomes.

On the other hand, when the rotating shaft 1 is rotated in the y direction (forward rotation) as shown in FIG. is regulated to α ₂ , and as a result, the rotation radius of the tilling claws 3 becomes R ₂ .

By the way, since the distance S 1 from the center line l' of the rotating shaft 1 to the contact point a on the stopper 7 side is set smaller than the distance S ₂ to the contact point _b on the stopper 8 side, The swing angle α ₁ during reverse rotation is larger than the swing angle α ₂ during forward rotation, and therefore the rotation radius R ₁ of the tilling claws 3 during reverse rotation is the rotation radius during forward rotation.
It will be smaller than R ₂ .

This means that when doing reverse tillage work, the rotary shaft 1
By rotating in the opposite direction, the rotation diameter of the tilling claws 3 is automatically changed to a small rotation diameter suitable for shallow raising of topsoil, etc., and when the rotation radius of the tilling claws 3 becomes smaller, the same force is applied to the tips of the claws. Since the torque is reduced when the soil is plowed, the rotational resistance received from the soil during tilling is reduced, and with the same horsepower, it is possible to increase the traveling speed (working speed) of a towing vehicle such as a tractor. Further, in the tilling claws 3, the vertical blade portion 3a on the working side during forward tilling is formed in a gentle arc-shaped curve, whereas the vertical blade portion 3b on the working side during reverse tilling is formed in a substantially linear shape. Therefore, the driving angle against the soil during forward tilling becomes gentler (larger), and the soil gradually comes into contact with the blade part 3a, which reduces the resistance of the soil during driving. During tilling, the driving angle becomes tighter (smaller), and the blade portion 3b comes into contact with the soil at any time, so that the soil crushing effect is greatly enhanced.

If, for a special purpose, it is desired to make the pawl rotation diameter larger during reverse rotation than during forward rotation, this purpose can be easily achieved by reversing the rotation shaft 1 from side to side and attaching it to the rotary tiller.

As described above, in the present invention, a roughly elliptic plate-shaped tilling claw having vertical blade portions on both front and back sides in the rotation direction is attached to a holder fixed to the rotation shaft of a rotary tiller so as to be able to swing back and forth in the rotation direction. The tilling claw is configured so that the swinging base end side of the tilling claw is brought into contact with the holder or the rotating shaft side to regulate the swinging angle of the tilling claw to a predetermined angle, and the tilling claw is connected to the holder or the rotating shaft side. This part is located at an asymmetrical position in the front and back with respect to the imaginary line l connecting the rocking center _P1 of the tilling claw and the rotation axis center _P2 , so that the rotation radius when the tilling claw rotates in reverse is smaller than the rotation radius when rotating in the forward direction. In addition, since the vertical blade part on the working side is formed in a substantially straight shape when rotating in reverse, the rotation diameter of the tilling claws can be adjusted to the roughness of the paddy field when rotating in the normal direction by simply switching the direction of rotation of the rotating shaft between the forward and reverse directions. The rotation diameter can be automatically changed to a size suitable for plowing work that requires deep plowing such as plowing, and when the rotation is reversed, it can be automatically switched to a smaller rotation diameter suitable for shallow plowing such as making beds for field crops. By making the rotational diameter of the tilling claws smaller, it is possible to reduce the rotational resistance received from the soil and increase the speed of the tractor or other towing vehicle, and the approximately linear vertical blades also improve the soil crushing effect. It is possible to significantly increase the efficiency of work and achieve high efficiency.

[Brief explanation of the drawing]

Figure 1 is a front view showing one embodiment of the present invention;
The figure is a side view of the same, and FIGS. 3 and 4 are explanatory diagrams of the functions of the main parts, respectively. In the figure, 1 is the rotating shaft, 2 is the holder, 3 is the tilling claw,
3a and 3b are vertical blade parts, α ₁ and α ₂ are swing angles, and a and b are contact parts.

Claims (1)

[Scope of utility model registration request] A generally elliptical plate-shaped tilling claw having vertical blade portions on both front and rear sides of the rotation direction is attached to a holder fixed to the rotating shaft of a rotary tiller so as to be able to swing back and forth in the rotation direction. The movable base end side is brought into contact with the holder or the rotating shaft side to restrict the swinging angle of the tilling claw to a predetermined angle, and the tilling claw contact portion on the holder or rotating shaft side is configured to control the swinging angle of the tilling claw. The tilling claws are located at an asymmetrical position in the front and back with reference to the imaginary line l connecting the center _P1 and the rotation axis center _P2 , and the tilling claws are constructed so that the rotation radius during reverse rotation is smaller than the rotation radius during normal rotation, A mounting device for a tiller claw for both forward and reverse rotation, characterized in that the vertical blade portion on the operating side is formed into a substantially straight shape during reverse rotation.