JP2002046407A - Agricultural wheel - Google Patents

Abstract

PROBLEM TO BE SOLVED: To facilitate waste disposal and perform exchange of only an elastic wheel body by facilitating separation and discrimination of a rim and an elastic wheel body, in an agricultural wheel having an annulus rim and an elastic wheel body to cover its whole with the rim serving as a core. SOLUTION: An elastic ring body 6 is molded separately from a rim 5. The rim 5 is charged in a storage hole 16 formed in the elastic ring body 6. By a positioning means 14 and a closing means 32, positioning and separation of an elastic ring body 6 at and from the rim 5 are prevented from occurring and the two means are integrally formed in a non-adhesion state.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an agricultural wheel used by attaching to an agricultural machine for paddy fields, upland fields and the like.

[0002]

2. Description of the Related Art As this kind of agricultural wheel, a pneumatic type wheel (for example, Japanese Utility Model No. 4-64) constructed by fitting a hollow tire formed of an elastic material such as rubber to a rim is fitted.
No. 37762, Conventional Example 1) or a rubber-baked type in which an elastic ring such as rubber is burned and coated on the entire annular rim formed by a round pipe or the like (for example,
Japanese Patent Application Laid-Open No. H10-203102, Conventional Example 2) and the like are known. Among them, the conventional example 1 has an advantage that the vibration suppressing effect is high, but it cannot avoid the problem of durability such as puncture.
When used in a rice transplanter that is used only twice, there is a problem in management such as air leakage.

On the other hand, the rubber-baked agricultural wheel of the conventional example 2 does not cause problems such as air bleeding and puncture as seen in the pneumatic type, and shortens the manufacturing time and cost. It has become the mainstream in recent years because it can be achieved.

[0004]

However, in the rubber-burned agricultural wheel of the conventional example 2, since the elastic wheel and the rim are firmly bonded by baking, the two wheels are separated from each other during disposal. Separation was difficult, and a great deal of labor and cost had to be taken to perform this separation. This is an obstacle to incinerating or recycling a rubber material or a metal material such as a rim of the elastic ring, and has been a bottleneck from the viewpoint of environmental measures.

[0005] In addition, even when the elastic wheel is deteriorated or damaged, the entire wheel must be replaced, which is uneconomical and causes an increase in the burden on the user side. The present invention has been made in view of such circumstances, and is intended to facilitate separation of an elastic ring and a rim, thereby facilitating disposal and replacing the elastic ring. The purpose is to provide wheels.

[0006]

The present invention employs the following technical means to achieve the above object. That is, the present invention provides an agricultural wheel having an annular rim and an elastic ring covering the whole of the rim as a core, wherein the elastic ring is formed as a separate body from the rim,
By mounting the rim in the elastic ring, the two are integrated in a non-adhered state.

[0007] With such a configuration, the rim and the elastic ring can be easily separated and separated, and the disposal can be facilitated, and the elastic ring alone can be replaced. The agricultural wheel according to the present invention, the elastic wheel,
Closing means for forming a receiving hole into which the rim is inserted, and a loading port for loading the rim into the receiving hole, and closing the loading port with the rim loaded into the receiving hole. And positioning means for positioning the elastic ring with respect to the rim.

[0008] With this configuration, the rim can be inserted into the elastic ring, and the inserted state can be maintained by the closing means without bonding the elastic ring and the rim.
The positioning means ensures that the elastic ring is positioned with respect to the rim. As the positioning means, a concave portion formed on one of the rim outer surface or the accommodation hole inner surface,
The rim may be configured to have a convex portion that can be fitted to the concave portion, and the rim may be configured to have a cross-sectional shape of a polygon or a non-perfect circle. Can be.

[0009]

Embodiments of the present invention will be described below with reference to the drawings. The agricultural wheel 1 according to the present invention is shown in FIG.
As shown in the figure, a plurality of spokes 3
A wheel body 4 having radially protruding portions, an annular rim 5 connected to an outer end of the wheel body 4, and a rim 5
And an elastic ring 6 made of an elastic material such as rubber, which is entirely covered with the elastic member 6. The elastic ring 6 has a main body 7 covering the entire outer surface of the rim 5 and a main body 7. Has a circumferential rib 8 and a ground lug 9 integrally protruding radially outward from the outer peripheral surface of the main body.

The rim 5 is formed of a pipe material or the like having a circular cross section.
Are provided at intervals in the circumferential direction. This connecting plate 1
Numeral 0 is formed of a plate material, and its outer diameter end is fixed to the inner peripheral surface of the rim 5 by welding. A mounting plate 11 is provided at the end of the spoke 3 of the wheel body 4. The mounting plate 11 and the connecting plate 10 are overlapped on the left and right sides and connected by fasteners such as bolts, so that the wheel body 4 The rim 5 is detachably connected to the rim 5.

A wheel cover 12 can be attached to the wheel body 4 as appropriate, and the wheel body 4 is not limited to the spoke type as described above, but can be replaced by a disk-shaped disk type. In addition, the connecting plate 1
0 can be formed in a donut shape or the like that is continuous in the circumferential direction. As shown in FIGS. 1 and 2, a housing hole 15 into which the rim 5 is inserted is formed in a circumferential direction inside the main body 7 of the elastic ring 6. The accommodation hole 15 is formed as a circular hole having an inner diameter substantially equal to or slightly smaller than the outer diameter of the rim 5.

On the inner peripheral side of the main body 7, a plate-shaped closed portion 19 is integrally formed so as to protrude in the circumferential direction.
The inside of the elastic ring 6 including the closed portion 19 in the radial direction with respect to the accommodation hole 15 is divided into two right and left portions, and the divided portion is a charging port 16 for inserting the rim 5 into the accommodation hole 15. ing. The loading port 16 is provided with a closing means 32 described later.
Is provided in the closed portion 19 so as to be held in a closed state. On the outer peripheral surface of the rim 5, a plurality of band-shaped convex portions 17 protruding in the radially outward direction are provided at intervals in the circumferential direction.
A plurality of concave portions 18 are formed corresponding to the convex portions 17 at intervals in the circumferential direction.

When the rim 5 is inserted into the housing hole 15, the projection 17 of the rim 5 is fitted into the recess 18 of the housing hole 15 so that the elastic ring 6 can be moved with respect to the rim 5 in the circumferential direction. Positioning and positioning around the cross-sectional outer shape of the rim 5 are performed. Here, the convex portion 17 and the concave portion 18 constitute positioning means 14 for positioning the elastic ring 6 with respect to the rim 5. . The shape of the convex portion 17 and the concave portion 18 may be triangular in cross section,
The top surface of the convex portion 17 and the bottom surface of the concave portion 18 can be formed in an arc shape or the like, and can also be formed in a short protrusion shape and a hole shape in the circumferential direction.

Further, it is also possible to form the projections 17 not only on the upper surface of the rim 5 but also on the left and right side surfaces, and to form the depressions 18 correspondingly. The elastic ring 6 is vulcanized by using a mold 20 shown in FIG. The mold 20 has a cavity 23 between an upper mold 21 and a lower mold 22.
In addition, a core 24 is inserted into the cavity 23. The core 24 has an annular main body 25 and a main body 25 as shown in FIG. 25 and a donut-shaped plate portion 26 protruding from the inner peripheral portion.

On the outer peripheral surface of the main body 25, a plurality of convex dies 25a for forming the concave portion 18 are formed in the circumferential direction, and in the plate portion 26, a plurality of insertion holes 26a are formed at intervals in the circumferential direction. Is formed. A concave portion 22a is formed at the center of the lower mold 22, and inside the concave portion 22a,
A positioning table 27 for positioning the core 24 is fitted. At the center of the positioning table 27, a step 28
A positioning portion 28 that bulges upward through a is provided, and a plurality of positioning pins 29 protrude from an outer peripheral side of the positioning portion 28.

In the above configuration, the main body 25 of the core 24
Is supported in the cavity 23 of the lower mold 22 via the support pin 30, and the plate portion 26 can be centered by inserting the positioning portion 28 into the central opening. Also, the insertion hole 26a of the plate portion 26
The positioning in the circumferential direction is performed by inserting the positioning pins 29 through the holes. After the vulcanization molding of the elastic ring 6 in the cavity 23,
The upper mold 21 is separated from the lower mold 22 and the mounting base 27 is
2a, the elastic ring 6 together with the core 24
Is released from the lower mold 22, and the positioning table 27 also functions as a removal aid that facilitates the release of the elastic ring 6.

Then, the core 2 is removed from within the released elastic ring 6.
When the cover 4 is removed, the housing hole 15 is formed inside the elastic ring 6 by the main body portion 25, and the loading port 16 is formed by the plate portion 26. 1 and 2
As shown in the figure, the elastic ring 6 is provided with a closing means 32 for holding the loading port 16 in a closed state with the rim 5 loaded in the receiving hole 15. This closing means 32
Has a pair of sandwiching plates 33 for sandwiching the closed portion 19 from both left and right sides, and the sandwiching plates 33 are formed in a ring shape from a metal material, a hard resin material, or the like.
The loading port 16 is closed by fixing the holding plate 33 with a plurality of fasteners including bolts 34 and nuts 35 in a state in which the holding plate 33 is in contact with the side surface of the closed portion 19.

The holding plate 33 may be divided into a plurality in the circumferential direction. Further, the closing means 33 may be configured by bonding the joint surface of the charging port 16 (the divided surface of the closed portion 19) in addition to or without the holding plate 33 and the fasteners 34 and 35. You can also. In the agricultural wheel 1 described above, the elastic rim 6 is formed separately from the rim 5, and the rim 5 is inserted into a housing hole 15 formed inside the elastic rim 6 and integrated. Since the elastic wheel 6 and the rim 5 are not directly bonded to each other, when the agricultural wheel 1 is disposed of, the rim and the elastic wheel can be easily separated and separated. When the elastic ring is damaged, the elastic ring 6 can be removed from the rim 5 and replaced easily.

Even when the elastic ring 6 and the rim 5 are not adhered to each other, the elastic ring 6 is not separated from the rim 5 by the closing means 32, and the relative position between the two is determined by the positioning means 14. The displacement can be reliably prevented. FIG. 6 shows a second embodiment of the present invention. In the present embodiment, the wheel body 4
Spokes 3 are integrally connected.
The convex portion 17 and the concave portion 18 are provided over the entire circumference in the circumferential direction.

A holding plate 33 as a closing means 32 is formed in a substantially U-shape in cross section, and is fitted from the inside to the closed portion 19 except for the spoke 3 portion. By forming the holding plate 33 into a substantially U-shape in this manner, the loading port 16 at the inner diameter end of the closed portion 19 is formed.
Is completely closed, thereby preventing the occurrence of cracks and loosening of the closed state in the portion, and even if the convex portion 17 and the concave portion 18 are formed in the circumferential direction, the pinch adjacent to the circumferential direction is held. Since the plate 33 is provided with the spokes 3 interposed therebetween, the elastic ring 6 is also positioned in the circumferential direction.

FIGS. 7 to 9 show another embodiment of the positioning means 14. FIG. FIG. 7A shows an example in which the convex portion 17 as the positioning means 14 is fixed to the rim 5 by screws. This facilitates attachment as compared with the case where the projection 17 is fixed to the rim 5 by welding. FIG. 7 (b) shows a rim 5 which is formed by curving a plate material in a circular shape, and in which a convex portion 17 is integrally formed by bending a butt end of the plate material in a radially outward direction. Has become. This makes it easier to manufacture compared to the case where the projection 17 is formed of a separate member, and can reduce the cost.

The rim 5 shown in FIG. 8A is formed by laminating two semicircularly curved plates vertically.
And two right and left convex portions 17 are formed by bending the butted ends of the respective plate members to the left and right sides. In the present embodiment, the convex portion 17 may be formed only on one of the left and right sides, and a pair of upper and lower (radial inner and outer) convex portions 17 may be formed with the rim 5 rotated by 90 °. Good. The rim 5 shown in FIG. 8 (b) is formed by laminating two plate members having an upper side curved in a semicircular shape to the left and right, and extending the lower side of each plate member downward to form a connecting plate. 10 are integrally formed.

In this embodiment, since the connecting plate 10 is formed integrally with the rim 5, the manufacturing can be easily performed, and the cost can be reduced. The one shown in FIG.
The rim 5 is formed in a non-circular circular shape, specifically, an elliptical shape, whereby positioning of the rim 5 around the cross-sectional outer shape can be performed. Also in this embodiment,
The convex portion 17 and the concave portion 18 as in the above embodiments may be formed, and the rim 5 can be formed not only in an elliptical cross section but also in an elliptical shape or the like.

FIG. 9 (b) shows a rim 5 having a polygonal cross section (triangular in the illustrated example), thereby positioning the rim around the outer diameter of the cross section. A recess 18 is formed on the upper surface of the rim 5 so that the accommodation hole 1
5 has a convex portion 17 on the upper surface. In each of the above-described embodiments, the concave portion 18 is provided on the rim 5 side.
May be formed, and the convex portion 17 may be formed on the accommodation hole 15 side.
The present invention is not limited to the above-described embodiment, and can be appropriately changed in design.

[0025]

As described above in detail, according to the present invention, since the elastic wheel and the rim can be easily separated, the agricultural wheel can be easily separated when discarded. It becomes possible to replace only the elastic ring when the body is damaged.

[Brief description of the drawings]

FIG. 1 is a partial perspective view of an agricultural wheel according to a first embodiment of the present invention.

FIG. 2 is a sectional view of an agricultural wheel.

FIG. 3 is an overall side view of the agricultural wheel.

FIG. 4 is a front sectional view showing a molding die for an elastic ring.

FIG. 5 is a plan view of a core.

FIG. 6A is a partial perspective view of an agricultural wheel according to a second embodiment of the present invention, and FIG. 6B is a cross-sectional view.

FIG. 7 is a sectional view showing another embodiment of the positioning means.

FIG. 8 is a sectional view showing another embodiment of the positioning means.

FIG. 9 is a sectional view showing another embodiment of the positioning means.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Agricultural wheel 5 Rim 6 Elastic ring 14 Positioning means 15 Housing hole 16 Loading port 32 Closing means

Claims (4)

[Claims] 1. An agricultural wheel having an annular rim and an elastic ring covering the whole with the rim as a core, wherein the elastic ring is formed separately from the rim. An agricultural wheel, wherein the two are integrated in a non-adhered state by inserting the rim into an elastic wheel. 2. A receiving hole in which the rim is to be inserted and an inlet for inserting the rim into the receiving hole are formed in the elastic ring, and the rim is inserted into the receiving hole. 2. The agricultural wheel according to claim 1, further comprising: a closing unit that closes the loading port in a closed state, and a positioning unit that positions the elastic ring body with respect to the rim. 3. 3. The positioning means has a concave portion formed on one of an outer surface of a rim and an inner surface of a receiving hole, and a convex portion formed on the other and can be fitted into the concave portion. The agricultural wheel according to claim 2. 4. The agricultural wheel according to claim 2, wherein the positioning means is formed by forming a cross section of the rim into a polygonal shape or a non-circular circular shape.