JPH09275709A - Tail wheel system for rotary power tiller - Google Patents

Abstract

PROBLEM TO BE SOLVED: To perform stable tilling work by surely removing soil stuck on a tail wheel even during work by a rotary power tiller. SOLUTION: In the rotary power tiller to be used while being linked to a walking type tractor, this machine is provided with a tail wheel supporting shaft expanded at the rear part of main body of the rotary power tiller in advancing direction so as to adjust the vertical height of main body of the rotary power tiller, tail wheel supporting rod 83 for vertically adjusting the height along this tail wheel supporting shaft, tail wheel arm 85 fixed at the lower end part of the tail wheel supporting rod 83, tail wheel fitted to this tail wheel arm 85 so as to be freely rotated, and scraper 10 arranged inside a plane including the axle of this tail wheel and fitted to the tail wheel supporting rod 83 so as to remove soil stuck on the peripheral face of the tail wheel.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a tail wheel device for a rotary cultivator, and more particularly to a tail wheel device for a rotary cultivator used in connection with a walking tractor.

[0002]

2. Description of the Related Art The walking type tractor called Thira, which was introduced in the process of transition of the agricultural power source of our country from mechanical power to mechanical power, does not require animal power. It freed farmers from the trouble of livestock and brought about primary labor saving. In areas where the introduction of large machines is inconvenient due to the relatively small area of a unit field in Japan, many walking tractors are still used, and it is indispensable for supplementary work even though it is mechanized agriculture. It is a machine. It is well known that many walk-type tractors are connected to a rotary cultivator and used for cultivating work in a field. This rotary cultivator has a plurality of rows of cultivating pawls attached to a cultivating shaft, and by forcibly rotating the cultivating shaft, the cultivating pawl performs a cultivating work while drawing a cycloid curve.

In this rotary cultivator, since the cultivating depth is determined by the height of the cultivating claw, in other words, the distance between the cultivating shaft and the field surface, this depth is adjusted to obtain an arbitrary cultivating depth. Is equipped with a tail wheel device. Since this tail wheel device moves on the surface of the field after plowing work, soil on the field surface is likely to adhere to the peripheral surface of the tail wheel. Is needed.

That is, as shown in FIG. 5, a general rotary cultivator conventionally used is connected to a walking tractor using a hitch box, and a part of the output of the tractor is cultivated. It is designed to drive the axis forcibly. In the figure, reference numeral 1 indicates the entire walking tractor, and an engine 3 as a power source is mounted at a front position on a frame 2 forming the tractor, and an output of the engine 3 is attached to the frame 2. Wheels 4, which are attached via
4 is transmitted to the vehicle so that it can move by itself.

Further, although not shown in the drawing, there is a hitch box at the rear end of the frame 2, and the hitch tool of the rotary cultivator 7 is connected to and integrated with the hitch box. Rotating tiller 7
On the other hand, power can be supplied from the PTO shaft of the walk-behind tractor 1 via the belt 6. A tail wheel support shaft 81 is attached to the rear end of the frame 8 constituting the rotary cultivator 7 by screw connection, and a handle 82 provided at the upper end of the tail wheel support shaft 81 is rotated. Thus, the tail wheel support shaft 81 can be fed vertically.

Further, a tail wheel support rod 83 having a caster angle is attached to a lower end portion of the tail wheel support shaft 81, and the tail wheel 8 is attached to an end portion of the tail wheel support rod 83.
4 is attached so that it can rotate, and is a walkable tractor 1.
It is possible to roll along with the movement of. In this figure, reference numeral 9 is a handle of an operator who walks following the walk-type tractor 1, and is equipped with an accelerator for controlling the engine, a lever for operating the clutch, and the like. Further, there is an apron 91 at a position not interfering with the rotation locus of the tilling pawl 7A and on the rear side in the traveling direction, and it is prevented that the cultivated soil is scattered to the worker due to the rotational driving of the tilling pawl 7A. The apron 91 can also be crushed by the arable soil.

[0007]

In the rotary cultivator as described above, soil adheres to the peripheral surface of the tail wheel due to the stickiness of the soil depending on the soil quality of the field in which the cultivating work is performed, and the tail wheel This phenomenon is remarkable in the field where the smooth rotation of the rice field is hindered and the water content is particularly high. In addition, the diameter of the tail wheel circumference increases due to the adhesion of soil, and in extreme cases it pushes up the rear part of the rotary cultivator, and further disables rotation of the tail wheel, resulting in resistance to running. As a result, the walking tractor stays in the same place, which causes the wheel to dig down in the field. In other words, once soil (mud) adheres to the peripheral surface of the tail wheel and its diameter increases, the soil further attracts the soil and enlarges the diameter of the tail wheel, making it impossible for the rotary tiller to run on its own. And then
There was a problem that the rotary tiller simply dug the soil in one place. Such a problem is because there is no means to remove the soil attached to the tail wheel at all, and in extreme cases, the operator must remove the soil using his own hands. There were times when I fell into trouble.

[0008] Therefore, an object of the present invention is to make it possible to surely remove the soil attached to the tail wheel even during the work so that a stable plowing work can be performed.

[0009]

In order to achieve the above object, the present invention relates to a rotary cultivator which is used by being connected to a walk-behind tractor. The rotary cultivator overhangs at the rear of the main body of the rotary cultivator in the traveling direction. A tail wheel support shaft that allows vertical height adjustment with respect to the cultivator body, a tail wheel support rod that allows vertical height adjustment along the tail wheel support shaft, and its tail wheel. A tail wheel arm fixed to a lower end portion of the support rod, a tail wheel rotatably attached to the tail wheel arm, and a tail wheel arranged in a plane including an axle of the tail wheel, And a scraper capable of removing soil adhering to the peripheral surface of the tail wheel, and the scraper is opposed to the peripheral surface of the tail wheel. Multiple slits on partial edges Provided has become a comb shape, further, the scraper is characterized in that the adjustable spacing for tail wheel.

With the above-described structure, the scraper acts on the tail wheel even when the soil in the field is relatively soft and tenacious and contains a large amount of water such as after rain, and its surface The soil attached to can be removed. Therefore, the diameter of the tail wheel does not become large and the plowing work is not disabled, and the plowing work can be performed with a stable depth.

[0011]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to FIGS. 1 to 4. The same parts as those described in the prior art are designated by the same reference numerals and the description thereof will be omitted. In these drawings, reference numeral 10 denotes a scraper having a soil removing function for the tail wheel, and the scraper 10 has a support portion 11 for the tail wheel support rod 83,
The support portion 11 has a tightening band 12 for tightening the tail wheel support rod 83 from the surroundings to maintain a fixed state. The tightening band 12 can hold the tightening force with a bolt 13, and when the bolt 13 is loosened, the support portion 11 is supported. 1
1 can be moved along the tail wheel support rod 83. The tail wheel 8 is attached to the lower end of the scraper 10 whose upper end is fixed to the support 11.
Scraping part 10A having a width in the tread direction of 4
The scraping portion 10A has comb-shaped edges facing the tail wheel.

The support portion 11 is a tail wheel support rod 8
In addition to being fixed by frictional force to the periphery of 3, the tubular support portion 15 fitted to the tail wheel support rod 83 is provided, and the support portion 15 and the tail wheel support rod 83 are drilled. The ground height of the support portion 11 is selected by a combination of the through hole 15A and the through hole 83A, and the pin 14 is fitted to fix the selected height. In other words, scraper 1
The gap between 0 and the tail wheel 84 is selected. For example, when a large amount of soil adheres, the gap between the scraper 10 and the tail wheel 84 is made small, or is brought into extreme contact to promote scraping of the adhered soil. If no soil is found, the scraper 10 and the tail wheel 84 are spaced apart from each other.

An end portion of a tail wheel arm 85 for rotatably supporting the tail wheel 84 is fixed to a lower end portion of the tail wheel support rod 83. The tail wheel arm 85 is provided with the tail wheel 84. An axle 86 that is rotatably supported is attached in a cantilevered state. With this cantilevered support system, tail wheel arm 8
This is convenient for suppressing the clogging of the soil between the No. 5 and the tail wheel 84.

Next, the actual operation of the rotary cultivator equipped with the tail wheel device according to the present invention will be described. The rotary cultivator is used by being connected to a walk-behind tractor and is put into a field to be worked to start the work. However, depending on the soil environment of the field, soil adheres to the peripheral surface of the tail wheel 84. In this case, when the soil is relatively low in water content or low in stickiness such as volcanic ash, even if it adheres to the tail wheel 84, it will fall naturally during the rotational movement and the tail wheel 8
Although the diameter of 4 is hardly seen, the soil of the field is accompanied by the tail wheel 8 as the work progresses in the case of a lot of water such as after rain or in the case of a field with poor drainage and heavy soil.
It will adhere to the four circumferential surfaces. At this time, the soil attached to the peripheral surface of the tail wheel 84 is scraped off by the scraper 10 arranged at a position close to the peripheral surface of the tail wheel 84. This scraper 10 is arranged in a plane including the axle 86 of the tail wheel 84, and is in a state orthogonal to the rotating direction of the tail wheel 84, which is convenient for scraping off soil.

The spacing between the scraper 10 and the tail wheel 84 is set by temporarily loosening the holding force of the tightening band 12 with respect to the tail wheel support rod 83 and by releasing the pin attachment of the support portion 15. It is selected by moving the tightening band 12 or the support portion 15 along the tail wheel support rod 83. After selecting an appropriate interval,
The holding force of the tightening band 12 and the pin connection of the support portion 15 again fix the tail wheel support rod 83 to the fixed state, and the soil drop action interval of the scraper 10 is selected.

According to the embodiment shown in FIGS. 1 to 3, since the interval of the scraper 10 can be selected steplessly, it is possible to select a delicate earth removal interval. Also,
According to the embodiment shown in FIG. 4, the loosening work and the tightening work of the bolt 13 are unnecessary, which is very convenient to perform during the work in the field.

[0017]

As is apparent from the above description, since the tail wheel device of the rotary cultivator of the present invention can provide the scraper with a soil removal function adapted to the field soil environment,
It surely prevents the diameter of the tail wheel from changing due to soil adhesion, which prevents an increase in resistance that prevents the walking tractor from running on its own
The walking tractor stays in one place and does not dive deep into the field. Further, since it is possible to prevent the diameter of the tail wheel from changing due to soil adhesion, it is possible to make the plowing depth constant.

[Brief description of drawings]

FIG. 1 is a side view of a tail wheel device for a rotary cultivator according to the present invention.

FIG. 2 is a rear view of the tail wheel device of the rotary cultivator shown in FIG.

FIG. 3 is a top view showing a mounted state of the scraper.

FIG. 4 is a schematic view showing another embodiment of the present invention.

FIG. 5 is a schematic side view of a rotary cultivator.

[Explanation of symbols]

 10 Scraper 11 Supporting part 12 Tightening band 13 Bolt 83 Tail wheel support rod 84 Tail wheel device 85 Tail wheel arm 86 Axle

Claims (3)

[Claims] 1. Used in connection with a walking tractor,
In a rotary cultivator equipped with a tail wheel at the tail end, a tail wheel support shaft located at the rear of the rotary cultivator body in the traveling direction and capable of vertically adjusting the height relative to the rotary cultivator body, and the tail wheel A tail wheel support rod that is attached to the support shaft so that the vertical mounting position can be selected, a tail wheel arm fixed to the lower end of the tail wheel support rod, and rotatably attached to this tail wheel arm. A tail wheel and a scraper that is arranged in a plane including the axle of the tail wheel, is attached to the tail wheel support rod, and is capable of removing soil attached to the peripheral surface of the tail wheel. A tail wheel device for a rotary cultivator, comprising: 2. The tail wheel device for a rotary cultivator according to claim 1, wherein the scraper is provided with a plurality of slits at a partial edge facing the tail wheel peripheral surface and has a comb tooth shape. 3. The tail wheel device for a rotary cultivator according to claim 1 or 2, wherein the scraper has an adjustable distance to the tail wheel.