JPH0221866Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Application Field) The present invention relates to a pressure roller for agricultural work for compacting the upper surfaces of ridges covered with soil after sowing.

(Prior Art) For example, a pressure roller is attached to the rear of a seeding machine that is towed by a tractor or the like to compress the surface of a field after sowing seeds. Conventional pressure rollers of this type are mostly made of iron products, and require complicated pressing and welding of steel plates during production.In addition, when used, there is a lot of dirt adhering to the roller surface, and there is a risk of contact with stones, etc. When the roller surface is deformed. Furthermore, there were problems such as the paint peeling off easily on the roller surface and rusting occurring.

In order to solve the above-mentioned problems, a pressure suppressing tire in which a hollow rubber tire is fitted to a wheel has already been proposed (see Japanese Patent Publication No. 4501/1983).

This tire has a lip-shaped cross section in the radial direction, with treads formed directly from the left and right bottoms.
A side portion that is substantially orthogonal to the tire axis is not formed.

When compressing with such a pneumatic tire, the crushing load is maximum at the center of the tread, which may push the soil cover left and right.Also, the tire has a small air volume and the tread is relatively thick. There was a problem in that the unevenness of the soil covering tends to cause vertical vibration of the tires.

Therefore, in order to solve the problem of the air volume and the thick wall of the tread portion, for example, the methods disclosed in Japanese Utility Model Publication No. 46-30642, Japanese Unexamined Utility Model Publication No. 83103-1983, and Japanese Unexamined Utility Model Publication No. 168404-1989 disclose It is conceivable to use agricultural wheel tires as pressure rollers.

However, when the above-mentioned agricultural wheel tires were used as pressure rollers, the following drawbacks occurred.

(Problems to be Solved by the Invention) That is, as shown in FIG. 6, the conventional agricultural wheel tire has a thick side portion 20 and a thin tread portion 21, and has a large air volume. ,
Since the wall thickness of the shoulder portion 22 is thin, when the side portion 20 is run on the top surface of the ridge 23 as a pressure roller, the side portion 20 opens left and right and presses the top surface of the ridge 23 left and right, causing cracks in the soil covering the top surface of the ridge 23. There was a problem that the seeds 25 germinated unevenly due to the formation of the lacerations 24.

When the side portions 20 open left and right in this way, if the degree of opening (degree of deformation of the side portions) differs between the left and right sides, it may cause the rollers to meander.
There was a problem with straightness.

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to provide a pressure roller for agricultural work that can improve the shape retention of the side portions, prevent cracks from forming on the upper surface of the ridge, and maintain good straightness.

(Means for solving the problems) In order to solve the above problems, the present invention takes the following measures. That is, the present invention is characterized by having a wheel 2, and a hollow tire 3 made of rubber or an equivalent elastic material fitted to the outer periphery of the wheel 2 while maintaining an extremely low air pressure. The hollow tire 3 has wall-shaped left and right side parts 10 substantially perpendicular to the tire axis, a tread part 9 which is substantially parallel to the tire axis and arranged between the left and right side parts 10, and a joint part between the side part 10 and the tread part 9. In a pressure roller for agricultural work formed with a certain shoulder portion 15, the left and right side portions 10 are formed as thick parts that mainly support the pressure load, and the tread portion 9 is formed by contacting and separating from the ground. The shoulder portion 15 is formed to have a thinner wall that can be elastically deformed in the radially and outwardly directions than the outer circumferential surface of the shoulder portion 15, and the shoulder portion is formed to be thicker than the side portions.

(Function) According to the present invention, when pressing is performed using a pressing roller, since the tread portion is formed thin, when the tread portion contacts the ground, the tread portion is elastically deformed in the radial direction from the outer circumferential surface of the shoulder portion. Due to this elastic deformation, the internal pressure is increased, and the tread portion on the non-ground contact side is elastically deformed to bulge radially outward, and the soil adhering to the surface of the tread portion is removed.

In addition, when the tread portion of the ground contact portion undergoes elastic deformation, the shoulder portion is formed thicker than the side portions, so deformation of the shoulder portion is prevented, the side portion maintains its shape retention, and Never deformed.

Therefore, cracks are not generated on the upper surface of the ridge, and straightness can be maintained favorably.

(Example) Hereinafter, an example of the present invention will be described in detail based on the drawings.

What is shown in FIG. 1 is a first embodiment of the present invention, and a pressure roller 1 is mainly composed of a wheel 2 and a tire 3. As shown in FIG.

The wheel 2 is formed by fixing a pair of left and right disc members 4, 4 made of sheet metal facing each other with bolts 6, nuts 7, etc. via a packing member 5, and a rim 8 is formed on the outer periphery thereof. The tire 3 is attached to the rim 8.
is fitted.

The tire 3 is a hollow tire consisting of a tread portion 9, a side portion 10, and a bead portion 11, and is integrally formed of rubber or an elastic material having the same effect. A bead portion 11 of the tire 3 is tightly fitted to the rim 8, and a bead 12 is fitted to the bead portion 11 to prevent the tire 3 from coming off. An air valve 13 communicating with the hollow part of the tire 3 is provided on the rim 8.
The air pressure in the hollow part of the tire 3 is maintained at an extremely low gauge pressure of zero to about 0.2 kg/cm ² .

In the cross-sectional shape of the tire 3, the crown portion is formed substantially flat in the width direction.

The left and right side portions 10 extending from the left and right bead portions 11 in a wall shape substantially orthogonal to the tire axis are approximately 10 to 14 mm thick in the illustrated example, and are formed to be thick enough to mainly support the crushing load. The tread portion 9, which is formed approximately parallel to the tire axis from the radially outer side of the left and right side portions 10 through the shoulder portion 15, has a thickness of 3 to 8 mm in the illustrated example, and supports the crushing load and is connected to the ground. It is formed to have a thin wall that can be elastically deformed in the radially inward and outward directions from the outer periphery of the left and right side portions 10 as the left and right side portions 10 approach and separate.

The shoulder portion 15 is thicker than the tread portion 9 and the side portion 10. The surface of the tread portion 9 has no lugs, blocks, etc., and is formed into a smooth surface as shown in FIG. 2A. However, patterns such as those shown in FIGS. 2B and 2C may be freely applied, and in that case, the unevenness is preferably relatively shallow (approximately 1 to 5 mm) as shown in FIG.

According to the embodiment of the present invention, as shown in FIG.
is mainly supported and rotates in an independent state, and the side part 10
The elastic deformation of the seedlings is slight, and the tread portion 9, to which a crushing load is applied, rolls and crushes the soil covered over after seeding. During this compaction, the soil covering is subjected to a pushing force so as to escape to the left and right, but the left and right side parts 10 prevent this. In the tread portion 9, the ground contact portion elastically deforms into a bulge inward of the hollow portion of the tire 3 due to the reaction force of the ground surface, and conversely, the portion away from the ground contact portion bulges outward.
Due to this expansion in opposite directions, sand, mud, etc. adhering to the tire surface are shaken off. That is, the tread portion 9 is formed thin in order to facilitate the elastic deformation described above, and the side portion 10 is formed thick so as not to deform under the pressing load. and,
Since the hollow portion of the tire 3 has a large volume and an extremely low internal pressure, the elastic deformation described above is made extremely smooth.

Further, when the tread portion 9 is deformed, the shoulder portion 15 on the outer circumference of the side portion 10 is
Because it is formed thicker than 0, the tread portion 9
side part 1 without being deformed due to the deformation of
Prevents deformation of 0.

Further, since the pressure roller 1 is made of a rubber tire, it will not be permanently deformed unlike an iron roller even if it hits a stone, etc., and will not rust, making it highly durable and extremely easy to manufacture.

What is shown in FIG. 5 is a second embodiment of the present invention, which is substantially the same as the first embodiment, but with a tire 3.
A protrusion 14 is provided on the shoulder portion 15 of. This protrusion 14 is inserted into the soil to further improve directional stability during running.

Note that the present invention is not limited to the above embodiments.

(Effects of the invention) According to the invention, since the left and right side portions 10 are formed with thick walls that primarily support the crushing load,
It is possible to perform compaction work while maintaining a large air volume in the hollow tire 3 and without causing the covered soil to escape in the left-right direction, and when the tread portion 9 is elastically deformed radially inward from the outer periphery of the side portion 10 due to contact with the ground, the tread portion 9 is On the non-ground side, the side portion 10 is elastically deformed in a radially outward direction from the outer periphery, making it possible to more completely remove soil adhering to the surface of the tread portion 9, thereby reducing the shock when it collides with stones, etc. can also be absorbed.

Further, according to the present invention, since the wall thickness is thick in the order of shoulder part 15>side part 10>tread part 9, deformation of the side part 10 and shoulder part 15 can be suppressed to a minimum, and the inside of the hollow tire is Since the air volume can be kept large and the covering soil can be compressed without escaping in the left and right directions, cracks do not occur on the upper surface of the ridge and germination is improved.
Furthermore, since the side portions 10 are less deformed, straight-line performance can be ensured.

[Brief explanation of drawings]

The figures show an embodiment of the present invention, FIG. 1 is a sectional view of the first embodiment, FIG. 2 is a surface view of the tread, FIG. 3 is a sectional view of the tread, and FIG. 4 is a sectional view for explaining the operation. FIG. 5 is a sectional view of the second embodiment, and FIG. 6 is a sectional view of the conventional example. 2...wheel, 3...tire, 9...tread part, 10...side part, 15...shoulder part.

Claims (1)

[Claims for Utility Model Registration] It has a wheel 2, and a hollow tire 3 made of rubber or an equivalent elastic material that is fitted around the outer periphery of the wheel 2 while maintaining an extremely low air pressure. Reference numeral 3 denotes wall-shaped left and right side portions 10 substantially perpendicular to the tire axis, and left and right side portions 1 substantially parallel to the tire axis.
In the pressing roller for agricultural work, which is formed by a tread portion 9 disposed between 0 and a shoulder portion 15 which is a joint between the side portion 10 and the tread portion 9, the left and right side portions 10 mainly support the pressing load. The tread portion 9 is formed into a thin wall that can be elastically deformed in the radially and outwardly directions from the outer peripheral surface of the shoulder portion 15 by contact with and separation from the ground, and the shoulder portion is thicker than the side portions. A pressure roller for agricultural work characterized by being formed into meat.