JPH0534481Y2 - - Google Patents

Description

[Detailed explanation of the invention] The present invention is based on a tiller called a so-called disc plow, which has a large number of discs installed obliquely on a single shaft with respect to the direction of tractor travel, and plows through the rotation of the row of discs. The present invention relates to a tractor meandering prevention device for a tiller that plows uncultivated land by forcibly driving a row of discs configured as described above.

In the one-way method, which consists of a row of disks in which a large number of disks are arranged diagonally on one axis, as is known, the tilled soil is thrown in one direction and moved.
On the other hand, as shown in Fig. 1, the disks 4 have a disk angle θ (normally 20° to 35° with a power tiller), so a working resistance f is applied to each disk 4, and this Therefore, thrust forces fsinθ are generated in each of the three directions of the axis, and these thrusts increase in proportion to the number of discs, that is, the total thrust F of fsinθ acts on the cultivator. This thrust force F becomes particularly excessive when the number of disks is large (the plowing width is wide), the disk angle θ is large, or when hard topsoil of uncultivated land is tilled.

Therefore, the tractor T to which these power tillers are attached is subjected to a moment in the _M1 direction around its center of gravity G, which causes operational problems such as the tractor T not being able to move straight but meandering in the _S1 direction. .

That is, although the tail wheel 5 of the tiller penetrates into the soil, this tail wheel 5 is located at the rear of the disk 4,
Moreover, the diameter of the tail wheel 5 cannot be made large because it would get in the way during bank plowing, and therefore it only penetrates shallowly into the soft, plowed land _.
does not become large, and on the other hand, the component force F ₁ of the thrust F becomes excessive as described above, resulting in F ₁ l>P ₁ L, and the moment M ₁ = F ₁ l−P ₁ L eventually becomes This is because it occurs on the tractor T.

On the other hand, Japanese Utility Model Application Publication No. 60-68904 discloses a double-row disc plow, in which a support shaft is provided at the rear of the tractor body obliquely with respect to the traveling direction, and an appropriate number of support shafts are provided on the rear of the tractor body. This is a double-row disc plow that is forcibly driven by supporting discs with different curvatures at appropriate intervals. It is said that reciprocating plowing is possible by making a full-scale cut from the center, and that power transmission is simple and can be manufactured at low cost.

Also, although there is no specific description, by providing an open-mouthed disk that targets the curvature in front of the disk provided on the support shaft, the open-mouthed disk has a lateral direction that occurs on the disk provided on the above-mentioned support shaft. It can be said that this generates a reaction force that resists the thrust force and contributes to improving the straightness of the tractor.

However, in response to an increase in the lateral thrust generated on the disc provided on the spindle, for example, an increase in the thrust caused by hardening of the topsoil, the open-mouthed disc increases its reaction force. There is no adjustment means such as these, and therefore, it is impossible to prevent a decrease in straightness due to the imbalance between the thrust force generated on the disk provided on the support shaft and the reaction force generated on the open-mouthed disk.

Furthermore, Japanese Patent Publication No. 46-23001 discloses a main frame connected to a towing vehicle, a swingable sub-frame swingably supported by the main frame, and a swingable sub-frame supported by the swingable sub-frame. A large number of disc supports are equipped with cultivation discs that rotate with the rotation of the sub-frame, and are installed at the rear of the main frame to swing between left and right guide positions, and the advance angle can be increased or decreased by adjusting screws. A reversible disc plow is disclosed that consists primarily of a plowing wheel that can be used.

Although the plowing wheel disclosed in the reversible disc plow can adjust the advance angle in the direction of resisting the lateral thrust generated by the reversible disc plow, the point of penetration into the soil is the same as the path of the plowing disc. In other words, because it penetrates the soft soil plowed by the plowing disks, for example, if the number of plowing disks is increased to increase the plowing width, the soil itself cannot resist the increased thrust force. The problem is that the towing vehicle cannot maintain the straightness of the towing vehicle because it collapses.

The device of the present invention was devised to solve the above-mentioned problems, and the present device will be explained below based on an embodiment of the drawings.

A three-point frame 1A is provided in front of the main frame 1, a long support frame 1B is provided at the left end of the main frame 1, and a short support frame 1B is provided at the right end of the main frame 1. A tilling frame 2 is installed obliquely with respect to the tractor traveling direction at the rear end of the support frames 1B and 1C, and a tilling shaft 3 that is rotatably supported is installed directly under the tilling frame 2. Similarly, a large number of disks 4, which are arranged diagonally and are curved into a dish shape, are fixed to the tilling shaft 3 with a disk angle θ. Reference numeral 5 denotes a tail wheel that supports the machine body via a leg 5A provided on the rear left side of the tillage frame 2.

A tiller with such a configuration is a one-way disc plow because it plows through the rotation of the row of discs.

This configuration is further equipped with a transmission M on the main frame 1, which inputs the power of the tractor T through a transmission shaft J, and forcibly drives the disk 4 via transmission shafts 6, 7 and chain transmission 7A to cultivate uncultivated land. The device that does this is a recently devised tiller.

The present invention is that, in these known one-way cultivators, a disc coulter 8 penetrating uncultivated land is provided on an appropriate frame in front of the disc 4, the angle of which can be adjusted in the direction of travel.

That is, in the embodiment, a bracket 9 is provided protruding from the support frame 1B, and a bearing 10 is provided vertically at the outer end of the bracket 9.

A support shaft 11 having a horizontal shaft 17 fixed thereon, which rotatably supports the disk coulter 8, is rotatably attached to the bearing 10 at its lower end.

An angle adjustment lever 12 of the disc coulter 8 is fixed to the upper end of the support shaft 11, and a screw 12A is fixed to the lever 12 so that it fits into the arc-shaped elongated hole 13 formed in the bracket 9. .

The angle of the disc coulter 8 can be adjusted around the support shaft 11 from parallel to the traveling direction to an inward angle α (0° to 10° in the embodiment) by rotating an angle adjusting lever 12.

14 is a nut fixed to bracket 9;
A push screw 15 is screwed into this, and its tips abut against both end surfaces of the lever 12 to set the inclination angle of the disc coulter 8.

Next, the function of the present invention will be described with reference to Figs. 2 to 4. As mentioned above, in the one-way type tiller, the tail wheel 5, which is known during operation, has a small diameter, and the disc 4 is used for tilling. The penetration depth is shallow because the ground has already been cleared, and the supporting force _P1 of the tail wheel 5 is therefore small.On the other hand, the thrust force F generated during work is excessive, so as pointed out at the beginning. Tractor T
S ₁ is rotated in the M ₁ direction around the center of gravity G
However, the disc coulter 8 penetrates the uncultivated land just in front of the disc 4, which increases the supporting force.
P ₂ is obtained.

Now, when the moment M ₁ , that is, lF ₁ -LP ₁ is relatively small, the attitude of the disc coulter 8 is set parallel to the traveling direction.

In this case, if the supporting force of the disc coulter 8 is _P2 , the moment _M2 in the opposite direction to the _M1 direction is
Since the resultant force of LP ₁ and l ₁ P ₂ acts on the tractor T, the moment M ₁ is canceled by the moment M ₂ , and the meandering of the tractor T can be prevented and the work S can be performed in a straight line.

Also, the value of moment M ₁ , i.e. lF ₁ −LP ₁
If the disc coulter 8 is relatively large, by tilting the disc coulter 8 inward by α degree and locking it, the disc coulter 8 has a supporting force P ₂ and a working resistance R when the disc coulter 8 is tilted inward. R ₁ , which is the component force of , acts.

Since the component force R ₁ increases as the inclination angle _of the disc coulter increases, the disc coulter ₈
By adjusting the inclination angle of , and increasing component force R ₁ , moment M ₁ and moment M ₂ can be balanced and meandering of tractor T can be prevented.

Note that support arms 16A and 16B are attached to the left and right sides of the tillage frame, and are connected to the support frames 1B and 1C with pins 16C and 16D. In this case, the pin 16C is configured to be freely insertable and removable, and several adjustment holes 16A' are opened in the support arm 16A, and by replacing the pin 16C with the adjustment hole, the support angle of the tillage frame is adjusted. can be adjusted.

In this way, the main frame is fixed behind the three-point frame connected to the lifting device of the towing vehicle, the tilling frame is installed diagonally behind the main frame, and multiple curved discs are fixed below the tilling frame. This is a one-way tiller that supports the tilling shaft and has legs on the rear end of the tilling frame that rotatably support the tail wheel, and the main frame in front of the tilling shaft is rotatable around a vertical axis. A horizontal shaft is fixed to the lower end of the support shaft in a direction substantially perpendicular to the traveling direction, a disc coulter is rotatably provided on the horizontal shaft, and the support shaft is locked at a desired rotational position. Since the locking means is provided, it is possible to use a one-way tiller with both the tail wheel installed at the rear end of the tilling frame and the disc coulter installed on the main frame in front of the tilling shaft that penetrates the hard soil of uncultivated land. In addition, the disc coulter can be adjusted inward at any angle, so it can sufficiently handle the magnitude of the lateral thrust generated by the tiller, improving the straightness of the towing vehicle. is always maintained.

[Brief explanation of the drawing]

Figure 1 is a plan view showing the relationship between a conventional tiller and a tractor, Figure 2 is a plan view of the proposed system, Figure 3 is an enlarged plan view of the main parts of the proposed system, and Figure 4 is a rear view of the same. . 4...disc, 5...tail wheel.

Claims (1)

[Scope of utility model registration request] The main frame is fixed to the rear of the three-point frame connected to the lifting device of the towing vehicle, a tilling frame is installed diagonally behind the main frame, and a tilling shaft with a plurality of curved discs fixed to the lower part of the tilling frame is pivotally supported. In a one-way tiller, which has legs that rotatably support the tail wheel at the rear end of the tiller frame, a support shaft is provided on the main frame in front of the tiller shaft so as to be rotatable around the vertical axis. A horizontal shaft in a direction substantially orthogonal to the direction of travel is fixed to the lower end, a disc coulter is rotatably provided on the horizontal shaft, and a locking means is provided for locking the support shaft at a desired rotational position. Features: Tractor meandering prevention device for one-way tillers.