JPS5856904A - Rubber tire wheel for agricultural machinery - Google Patents

Abstract

PURPOSE:To dispense with manufacturing of an integrated body of a bead ring and a tire by making a pair of bead rings, inserted in a peripheral groove of a bead part, to bear on a safety guide part by means of an elastic bead supporting ring to fix them from the inside in an axial direction. CONSTITUTION:A pair of bead rings 8 inserted free of detachment or attachment in a pair of peripheral grooves 7 located in a bead part 4 of a tire 1 are fixed to a safety guide part 11 by means of an elastic bead ring supporting ring 9 prior to the rim assembling of the tire 1. The end parts 10 is desired to have thickness T that is 1/1 to 1/2 times the bead ring thickness and 1.5 to 4 times the thickness t in the midst. This prevents the part between the bead rings 8 and a rim flange Rf from being damaged. With these contrivances, the bead ring 8 and the tire 1 can be manufactured separately so that the vulcanizing formation in manufacturing the tire 1 and the rim assembling of the tire 1 can be facilitated.

Description

DETAILED DESCRIPTION OF THE INVENTION This invention relates to improvements in rubber tire wheels for agricultural machinery that are used under extremely low pressure or without internal pressure filling.

Tires for agricultural machinery used for work on soft ground such as fields are prevented from digging into the soil during work.

In order to prevent this, it is necessary to obtain a large ground contact area of the tire brought about by extremely low internal pressure or no internal pressure, so reinforcement with a carcass made of cord ply such as passenger car or truck / bus tires is necessary. It is practically not done, it is so-called Gomuta 5 Years.

When fixing such a rubber tire to a rim as a wheel, it is conceivable to fix the rim and the bead of the tire that engages with it with adhesive, as has already been proposed, but bead rings (also known as bead Ill wires) It is practical to provide a tire bead at the bead of the tire and fix it to the compression back with a tightening margin between the rim and the bead base located at the tip of the bead between the rim base and the bead ring. .

The bead ring mentioned above can be integrated into the bead part of the tire, but if the tire body and bead ring are manufactured separately and the bead ring is fitted when assembling the rim, it will be easier to manufacture the tire, especially Vulcanization molding work becomes much easier.

SUMMARY OF THE INVENTION An object of the present invention is to provide a rubber tire wheel for agricultural machinery having an improved bead portion that does not have a bead ring or an equivalent fixing means during tire manufacture.

Therefore, the rubber tire wheel for agricultural machinery of the present invention has a rubber tire consisting of an annular tread portion located in the center, side portions and bead portions extending radially inward from both ends of the tread portion. In the tire wheel assembled to the tire wheel, the bead portion is removably attached to the circumferential groove facing the inner cavity surrounded by each part of the tire and the rim, and each port 1'.

a pair of bead rings fitted into the circumferential groove, and at least one of the groove walls of the circumferential groove has a stable guide part extending inward in the axial direction of the tire, and the pair of bead rings are supported on the stable guide part by a bead supporting elastic ring. It is characterized by being fixed from the inside in the axial direction.

The present invention will be explained below based on the drawings.

FIG. 1 is a sectional view of a rubber tire wheel for agricultural machinery according to the present invention. In the illustrated tire wheel, an annular tread portion 2 occupies the center portion of the tire, and extends radially inward from both ends of the tread portion 2 to a side portion 3 and a peed portion ≠, respectively. In this embodiment, the tread part 3 has a substantially flat shape, on which the lugs J are arranged symmetrically in the circumferential direction of the tire across the equatorial plane E-E, and the side parts 3 have a substantially flat shape. The inside of the 5-ear is curved, giving it a ginkgo leaf-like cross-sectional shape. A housing tire is a single piece of rubber that is not reinforced with a carcass housing or a breaker using a cord layer as a reinforcing material. However, the code layer can be partially buried as long as it does not compromise the purpose.

It is possible to strengthen it.

Now, the bead part ke has a pair of circumferential grooves 7 facing each other on the left and right sides facing the inner cavity 6 of the tire, and bead rings can be freely attached and detached in these grooves 7. It is fitted into the rim R to prevent the bead ring T from falling off from the circumferential groove 7 when the tire L is assembled into the rim R and used as a wheel, and to prevent the entire bead part from sliding inside the rim. prevent this from happening. In addition, bead ring support elasticity is used between both bead rings to facilitate tire rim assembly, which will be described later. ...Has a ring. Although the material of the elastic ring 9 is not limited, it is desirable to use a synthetic resin material because it is lightweight and has high elasticity. Further, the end portion /θ of the elastic ring 9 has a thickness T that is V1 to l/2 times the thickness of the bead ring. The overall thickness of this elastic ring 9 can be made to be approximately the same as the thickness T of the five ends, but if the thickness t of the central part is made thinner than the end part /θ as shown in the figure, excessive lateral force will be applied to the tire. When the force is applied to the support elastic ring 9, the center part of the elastic ring 9 becomes moderate and the force is absorbed, so that the part sandwiched between the bead ring t and the rim 7 flange Rf'' is not damaged. The ratio of the thickness of the end lθ and the center is:
Although it depends on the material, the range is /-4', preferably S-da.

The bead base located at the tip of the bead portion 1 is assembled into the compression back between the bead ring t and the rim base Rb when the tire is assembled into a rim, as shown in FIG. Further, the lower side wall of the bead fixing circumferential groove 7 in the bead base extends in the direction of the rotational axis of the tire and serves as a stabilizing guide l for the elastic ring 9.
/ to form. This fixed guide l/ is necessary in this invention to fix the elastic ring 9 concentrically with the bead ridge.

FIG. 2 is a sectional view of a bead portion of a tire wheel according to another embodiment, and in this example, the stability guide //I is as shown in the figure.
It is formed by extending the upper side wall of the circumferential groove 7 toward the inner side 5 in the rotational axis direction, and in this case, the stable guide//
/ comes into contact with the upper surface of the elastic ring 9. The stability guide can also be formed by extending both side walls of the circumferential groove 7 inward in the rotation axis direction of the tire.

The reference numeral /2 in FIG. 1 is a circumferential rib that prevents workpieces from entering between the rim 7 flange Rf and the bead portion G.

In the present invention, when the bead ring r is not used, the bead portion of the tire is fixed directly to the rim with the elastic ring 9 (1). In this case, the end lθ of the elastic ring also functions as a bead ring. In this case, the width T of the end of the elastic ring corresponds to the thickness of the bead ring.

When assembling a tire to a rim, first set the tire's Bi2...
The bead ring r' is fitted into the bead fixing circumferential groove 7 of the bead part DA, and then the bead ring supporting elastic ring 9 is placed between the bead rings and fixed by leaning against the stable guide. After assembling the tire part in advance in this way, the divided part R of the rim R
1 and Rr are applied from the left and right of the tire L and pressurized appropriately.As shown in Fig. 7, the tire's equatorial plane E-E position coincides with the disc part of the rim, so this part is fixed together by tightening the bolts. This will complete the tire and wheel assembly. Further, when the 1° portion of the bead is fixed to the rim only by the bead supporting elastic ring without using a bead ring, the work of fitting the bead ring into the circumferential groove is simply omitted from the above series of means.

When using the tire wheels assembled in this way for work, if you want to use them without filling the internal pressure, you can mount the tire wheels as they are on the vehicle, or if you want to use extremely low internal pressure, you can attach them to the base of the rim. It is sufficient to fill the internal pressure from pulp (not shown) attached to the part and install it in the vehicle.

As described above, in the tire wheel of the present invention, when using a bead ring, the tire body and the bead ring 1 are manufactured separately, and when assembling the rim, the bead ring is fitted into the circumferential groove, and a specific bead support is provided. Because it is fixed using an elastic ring, the vulcanization molding work during tire manufacturing is significantly easier. Also, the use of the bead support 5 elastic ring makes it easier to assemble the tire rim, and the bead ring is not circular during work. It also prevents the bead ring from falling out of the circumferential groove, and if the bead ring is not used, the work of fitting the bead ring into the circumferential groove is omitted, making rim assembly even easier, making it extremely useful. It's large.

[Brief explanation of the drawing]

FIG. 1 is a cross-sectional view of a tire wheel according to an example of the present invention, and FIG. 2 is a cross-sectional view of a bead portion of a tire wheel according to another example of the present invention. /...tire, 2...tread part, 3...side part, V...bead tL, t...lug, 6...inside of the tire), 7...circumferential groove , l... Bead ring, 9... Bead support elastic ring, /θ... End of support elastic ring, //, ///... Safety guide, /2... Circumferential rib. 4t-Figure 1. gu'/3

Claims (1)

[Claims] 1. A rubber tire consisting of an annular tread portion located at the center, side portions and bead portions extending radially inward from both ends of the tread portion, respectively, is assembled to a rim at the bead position. In the tire wheel, the bead portion has a circumferential groove facing each other facing the inner cavity surrounded by each part of the tire and the rim, and a pair of beads removably fitted into the groove. At least one of the ring and the groove wall of the circumferential groove is provided with a stable guide part extending inward in the axial direction of the tire, and the pair of bead rings are rested on the stable guide part by a bead supporting elastic ring and fixed from the inside in the axial direction. Agricultural machine 1 featuring rubber tire wheels. (a) The rubber tire wheel for agricultural machinery according to claim 1, wherein the bead supporting elastic ring is made of a synthetic resin material. 3. Place the center part of the bead support elastic ring against both ends! 1・
A rubber tire wheel for agricultural machinery according to claim 1, wherein the rubber tire wheel is made easy to deform by reducing the wall thickness. 4. In a tire wheel in which a rubber tire is assembled to a rim at a bead position, the rubber tire consists of an annular tread portion located at the center, side portions and bead portions extending radially inward from both ends of the tread portion, respectively, and the bead portion are circumferential grooves facing each other facing the inner cavity surrounded by each part of the tire and the rim, and at least one of the groove walls of the circumferential groove is a stable groove extending inward in the axial direction of the tire. A rubber tire wheel for agricultural machinery, comprising a guide portion, and a bead supporting elastic ring extending between the inner circumferential grooves and fixed from the inside.