JPH1191302A - Paddy field tire wheel - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce mud adhesion and lighten a wheel by using disk (wheel) shaped paddy field tire wheel. SOLUTION: The wheel is equipped with a pair of circular disk components 9 which bulge-form bending ribs 7, 8 on inner and outer peripheral parts of plate parts 6, and an axle mounting boss 2. By superposing the plate parts 6 of the pair of circular disk components 9, a circular disk 3 of a structure which has a hollow rim 10 formed with an outer peripheral bending rib 7 and a hollow part 11 formed with inner peripheral bending ribs 8 and the axle mounting boss 2 is constituted, and by coating the hollow rim 10 with elastic material an elastic ring body 4 is constituted.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a paddy field tire wheel used for a riding rice transplanter, a direct sowing machine, and the like.

[0002]

2. Description of the Related Art Since pneumatic tires need to be air-managed as tire wheels for paddy fields, so-called maintenance-free tires, which do not require air management, have recently become mainstream. There are two types of maintenance-free tires: spoke type and disc type.The spoke type may cause damage to planted seedlings, lack of stock, etc. The disk type is particularly attracting attention because of the large number of parts, the complicated process, and the high cost due to an increase in the amount of rubber.

There is a technique disclosed in Japanese Patent Application Laid-Open No. Hei 8-2203 as this disc-type tire wheel, which has the advantages of improving the strength against lateral force, discharging mud on its own by rotation due to running, and the like. .

[0004]

The tire wheel disclosed in the above publication can be expected to exhibit the above-mentioned advantages.
There were the following issues. That is, since the tire mounting portion corresponding to the annular rim has a bent portion, and the edge of the bent portion is covered with an elastic material (rubber) to form an elastic ring, the elasticity caused by the edge is provided. Cracks were generated in the ring body, and when these cracks grew, the rubber was chipped and there was a risk of rusting.

[0005] The disc (part) in the form of a disc is provided with the bent part,
It has an extended part and a molded part, and since the shape is complicated to press-mold this, a considerable amount of pressing force is required, which may increase the cost and increase the accuracy. There was a possibility that it could not be expected. An object of the present invention is to provide a paddy field tire wheel which solves the above-mentioned problem by using a disk disk as a middle structure.

Here, paddy fields include wet fields, soft lands, and the like.

[0007]

The paddy field tire wheel 1 according to the present invention comprises a pair of disk disk components 9 having curved ribs 7 and 8 bulging on the inner and outer peripheral portions of a flat plate portion 6. , An axle mounting boss 2 and said pair of disc components 9
The hollow rim 10 formed by the curved ribs 7 on the outer peripheral portion, the curved ribs 8 on the inner peripheral portion, and the axle mounting boss 2
(1) A disk 3 having a middle structure having a hollow portion 11 is formed, and the hollow rim 10 is covered with an elastic material to form an elastic ring 4. ).

By adopting such a configuration,
The hollow rim 10 can reliably prevent internal cracks from being generated in the elastic ring 4, and the press forming of the paired disk disk components 9 does not have a complicated cross-sectional shape, so that there is no need for a large amount of pressing force and manufacturing is possible. The cost has also been reduced. In addition, since the disc 3 has a hollow portion 11 in the middle structure, it is lightweight, has less horsepower loss, prevents excessive settlement, and facilitates paddy field traveling.

Of course, like a spoke type wheel, the mud is not lifted or carried around much, so that even when turning (turning) on a headland or the like, muddy soil and muddy water can be prevented from flowing in the left and right directions, and running can be facilitated. . Further, the paddy field tire wheel 1 according to the present invention is characterized in that the hollow rim 10 formed by the curved ribs 7 abuts the edges of the curved ribs 7 and welds the entire circumference to the joint 12. (Claim 2).

By employing such a structure, when the elastic ring 4 is formed by vulcanizing (including rubber baking) an elastic material on the hollow rim 10 of the disc 3, the hollow rim of the elastic material is used. The intrusion into the inside of 10 can be surely prevented. Further, the paddy field tire wheel 1 according to the present invention is characterized in that, in addition to the configuration of claim 2, the flat plate portions 6 are joined to each other with the fasteners 13 at intervals in the circumferential direction. (Claim 3).

By adopting such a configuration, the opening phenomenon of the welded joint 12 of the hollow rim 10 can be surely prevented. Furthermore, in the paddy field tire wheel 1 according to the present invention, the axle mounting boss 2 is inserted into the curved rib 8 on the inner peripheral portion in addition to the configuration of the second and third aspects, and the weld joint 1 is formed.
4, wherein the hollow portion 11 has a tapered shape in a radially outward direction in a sectional view (claim 4).

By adopting such a configuration, it is possible to reliably prevent clogging at the central portion of the disk 3 and to reduce the horsepower loss and to prevent excessive sinking. Further, the paddy field tire wheel 1 according to the present invention has a hollow rim 10.
Has a substantially square shape in a cross-sectional view, and has a rounded corner portion (claim 5).

By employing such a configuration, the amount of the elastic material (rubber) used can be reduced, thereby shortening the vulcanization time and improving the production rate. It was completely prevented. Furthermore, the paddy field tire wheel 1 according to the present invention is characterized in that a portion where the flat plate portion 6 is joined is covered with an elastic material constituting the elastic wheel 4 (claim). 6).

By adopting such a configuration, the fastener 13 for reliably preventing the opening of the welded joint 12 does not rust, and the fastener 13 does not cause clogging or the like. Here, the fastener 13 includes rivets, bolts and nuts, spot welding, and the like.

Further, a paddy field tire wheel 1 according to the present invention.
Is characterized in that the disk 3 having the middle structure has a left-right symmetrical shape with the overlapping surface of the flat plate portion 6 (claim 7). By adopting such a configuration, the number of parts can be reduced and the number of parts can be reduced, and the productivity can be further improved, and the manufacturing cost can be reduced.

[0016]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 shows the overall configuration of a paddy field tire wheel 1 according to the present invention. The wheel 1 is provided with an elastic material (rubber) on an annular rim on an outer peripheral portion of a disc 3 having an axle mounting boss 2 at the center. The figure shows an elastic ring 4 which is particularly useful for the front wheel of a riding rice transplanter.

For this reason, the elastic ring 4 is integrally vulcanized (rubber-baked) with the lug portions 5 projecting left and right alternately from the trapezoidal blade lugs 5A. However, the paddy field tire wheel 1 according to the present invention can also be applied as a rear wheel of a riding rice transplanter (including a direct watering machine). In this case, the shape of the lug portion 5, the wheel diameter, and the like are changed.

As shown in FIG. 2, the disk disk 3 has a pair of disk disks having curved ribs 7, 8 formed on the inner and outer peripheral portions of the flat plate portion 6, as shown in FIG. A component 9 and an axle mounting boss 2 are provided, and the flat rim 6 of the pair of disk components 9 is overlapped to form a hollow rim 10 with a curved rib 7 on the outer periphery and a curved rib 8 on the inner periphery. The disk disk 3 of the middle structure having the hollow portion 11 formed by the axle mounting boss 2 is formed. The hollow rim 10 is covered with an elastic material to form the elastic ring 4.

Here, the disk component 9 has a thickness of 2.
It can be easily formed by press-forming an iron plate (SPHC) of about 0 mm. Also, axle mounting boss 2
May have a disk-shaped mounting surface at the center of the disk 3, but in the figure, 43
The boss 2 has a pin insertion hole 2A for fixing the axle plate.

The hollow rim 10 formed by the curved rib 7 abuts the edges of the curved rib 7 and is welded to the entire circumference 12 so that when the elastic material is vulcanized and formed, the hollow rim 10 is formed of the material. Thus, the intrusion into the inside 10 is prevented. Further, the disk disk component 9 prevents the opening of the welded joint 11 by joining the flat plate portions 6 to each other with a fastener 13 at a circumferential interval (see FIG. 1). Although a rivet is shown as the tool 13, it can be a bolt and a nut.

The fastener 13 may be exposed to the outside, but this may cause rusting, and there is also adhesion of mud and the like. It is advantageous to cover with the portion 4A. At this time, as shown in FIG. 2, the peripheral portion 4A of the ring body is inclined on both sides toward the center in the radial direction, so that the flow of mud and muddy water is smooth. Be useful.

When the fastener 13 is covered with the inner peripheral portion 4A, the flat plates 6 can be spot welded to each other instead of rivets and bolts and nuts. Parts (rivets, bolts and nuts, spot welds). Further, the axle mounting boss 2 is inserted into the curved rib 8 on the inner peripheral portion of the disk disk component 9 to be welded and joined 14, and the hollow portion 1 is formed.
1 has a tapered shape in a radially outward direction in a sectional view,
As a result, the rigidity of the axle mounting portion is improved while its weight is reduced, and clogging is prevented.

Therefore, when mounted on a rice transplanter or the like, not only the horsepower loss can be reduced, but also excessive sinking is suppressed. The inner peripheral portion of the curved rib 8 (corresponding to the insertion hole of the boss 2) is formed with a warp 8A which is curved outward as shown in the figure, so that the positioning when the boss 2 is welded and joined 14 is accurate, and This is to enhance the bonding.

Further, the hollow rim 10 formed by the curved rib on the outer peripheral portion of the disk component 9 is formed in a substantially square shape in a sectional view, and the corner portion is formed in a round shape. The amount of the elastic material used is reduced, so that not only the vulcanization time is shortened, but also the occurrence of cracks inside the elastic ring 4 is reliably prevented.

However, the hollow rim 10 does not prevent the cross-sectional shape from being square, circular, or the like. In addition, since the disk 3 having the middle structure has a symmetrical shape with the overlapping surface of the flat plate portion 6, the press forming of the disk disk component 9 is simplified, and the parts can be shared. This can improve productivity.

The outer surfaces of the boss 2 and the disk 3, which are the metal parts (excluding the inner diameter of the boss) of the paddy field tire wheel according to the present invention, have an adhesive and a coating thickness of 20 μm.
The above-mentioned aqueous alkyd resin or the like is applied to prevent the occurrence.

[0027]

As described in detail above, according to the paddy field tire wheel of the present invention, not only is it light in weight, but also less adhering to mud and the like, and not only can the production cost be greatly reduced,
There is no occurrence of cracks in the ring body, and the durability can be improved.

[Brief description of the drawings]

FIG. 1 is a side view of a paddy field tire wheel according to the present invention.

FIG. 2 is an enlarged sectional view taken along line AA of FIG.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Tire wheel for paddy field 2 Axle mounting boss 3 Disc disk 4 Elastic wheel 6 Flat plate part 7 Curved rib (outer peripheral part) 8 Curved rib (inner peripheral part) 9 Disc disk constituent element 10 Hollow rim 11 Hollow part

Claims (7)

[Claims] 1. A pair of disk disk components (9) having bulging ribs (7) and (8) on the inner and outer peripheral portions of a flat plate portion (6), and an axle mounting boss (2). And a hollow rim (1) formed by a curved rib (7) on the outer peripheral portion by superimposing the flat plate portions (6) of the pair of disc disk components (9).
0), a curved disk (3) having a hollow portion (11) formed by a curved rib (8) on the inner peripheral portion and an axle mounting boss (2). The hollow rim (10) is made of an elastic material. A paddy field tire wheel characterized in that the elastic wheel body (4) is formed by coating with a pad. 2. Hollow rim (10) with curved ribs (7)
The tire wheel for a paddy field according to claim 1, characterized in that the edges of the curved ribs (7) abut against each other and are welded all around. 3. The paddy field according to claim 1, wherein, in addition to the configuration of claim 2, the flat plate portions (6) are joined to each other with a fastener (13) at a circumferential interval. Tire wheels. 4. An axle mounting boss (2) is inserted into a curved rib (8) of an inner peripheral portion and welded (14) to the hollow portion in addition to the configuration of claim 2 or 3. 2. The paddy field tire wheel according to claim 1, wherein (11) has a tapered shape in a radially outward direction in a sectional view. 5. The paddy field according to claim 1, wherein the hollow rim (10) has a substantially square shape in a cross-sectional view, and the corner portion has a round shape. Tire wheels. 6. A method according to claim 3, wherein a portion joining the flat plate portions is coated with an elastic material constituting the elastic ring. Tire wheels for paddy fields. 7. A disk according to claim 1, wherein the disk (3) having the middle structure has a symmetrical shape with a plane of superposition of the flat plate portions (6). Paddy tire wheels as described.