JPH06328909A - Oil-resistant tire for tire roller - Google Patents

Abstract

PURPOSE:To prevent change of profile on a surface of tread due to spraying of light oil and form a smooth surface of paved road. CONSTITUTION:An annular rubber cover body 3 which uses oil-resistant rubber and has a cylindrical section 11 in contact with a surface 4A of tread of a tire 2 for tire roller and a flange section 12 in contact with a buttress face 10 of the tire 2 which is provided on both sides of the cylindrical section 11 and ranges on the surface 4A of tread via a tread fringe E is mounted on the tire 2 by elastic compression of the rubber cover body 3.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an oil resistant tire for a tire roller capable of maintaining a substantially uniform tread surface profile from the beginning to the end of use.

[0002]

2. Description of the Related Art For example, so-called tire rollers are often used in secondary rolling work such as asphalt pavement work, and as the tire rollers, the radius of curvature of the tread surface is extremely large in order to finish the road surface smoothly. The pneumatic tire set to is used.

In this type of tire, light oil is sprayed on the tread portion in order to prevent the asphalt from adhering to the tread surface during rolling, and therefore the tread portion is generally oil resistant. Styrene with excellent properties
It is formed by using butadiene rubber (SBR).

[0004]

However, by repeatedly spraying light oil, the light oil adheres from the tread surface to the buttress surface and is absorbed in the tread rubber.
For this reason, a phenomenon occurs in which the tire outer end in the tire axial direction in particular expands more than other parts and pushes up both ends of the tread surface, and as a result, as shown in FIG. 4, the tread shoulder region on the tread edge side. The profile of the tread, that is, the ground contact surface shape TS, may be changed such that K1 swells more unevenly than the tread central region K2 inside thereof, and two concave streak marks may be left on the rolling surface. Problems such as occur.

As a result of research, it has been found that the change in the profile of the tread surface is largely influenced by the light oil absorbed from the tread surface and the buttress surface.
By reducing the amount of light oil absorbed from the tread surface and the buttress surface, it was found that uneven rubber expansion can be reduced and the profile of the tread surface can be maintained substantially uniform.

That is, the present invention is based on the fact that an annular rubber cover body made of oil resistant rubber is attached to a tire for a tire roller by elastic compression to reduce absorption of light oil from the tread surface and the buttress surface. It is an object of the present invention to provide an oil resistant tire for a tire roller that can solve the above problems.

[0007]

In order to achieve the above object, an oil resistant tire for a tire roller of the present invention comprises a carcass folded around a bead core of a bead part from a tread part to a sidewall part. A tire for a tire roller has a cylindrical portion in contact with the tread surface of the tire, and flange portions provided on both sides of the cylindrical portion and in contact with the buttress surface of the tire connected to the tread surface via a tread edge. An annular rubber cover body using is attached by elastic compression of the rubber cover body.

[0008]

In the tire for the tire roller, a rubber cover body using oil resistant rubber is provided, which has a cylindrical portion in contact with the tread surface of the tire and flange portions provided on both sides of the cylindrical portion and in contact with the buttress surface of the tire. Attach by elastic compression of this rubber cover. Therefore, it is possible to prevent light oil from adhering to the tire surface and the buttress surface, and to suppress uneven bulging of the tread rubber and the like, so that the profile of the tread surface can be maintained substantially uniform from the initial stage to the final stage of use.

As the oil resistant rubber, rubber such as chloroprene rubber (CR) which is less likely to cause volume expansion of the rubber by light oil, that is, swelling, can be preferably used.

The outer diameter of the rubber cover body is set to be slightly smaller than the outer diameter of a tire for a normal tire roller that has already been completed, and the rubber cover body is extended and attached to this tire by elastic compression. Therefore, it is possible to prevent deterioration of various performances and quality of the tire caused by mixing the oil-resistant rubber used for the rubber cover body with the rubber constituting the tire, and improve the oil resistance without impairing productivity and economic efficiency. You can. An adhesive may be used between the rubber cover body and the tire.

[0011]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. In the drawings, the oil resistant tire for tire rollers 1 of the present invention 1
In the tire 2 for a tire roller, an annular rubber cover body 3 made of oil resistant rubber is attached by elastic compression of the rubber cover body 3.

In this embodiment, the tire 2 has a carcass 9 of a bias structure or a radial structure that is folded back from the tread portion 4 to the sidewall portion 5 around the bead core 7 of the bead portion 6, and the tread portion 4. The breaker layer 1 arranged inside and adjacent to the outside of the carcass 9 in the radial direction.
5, and a tube for keeping the filled air airtight is arranged inside the carcass 9.

When the carcass 9 has a bias structure, the carcass 9 has a carcass cord whose tire equator C.
Is formed from a plurality of carcass plies arranged at an angle of 30 to 50 degrees with respect to each other, and the carcass plies are arranged in different directions so that the carcass cords cross each other.

On the other hand, when the carcass 9 has a radial structure, the carcass 9 is composed of one carcass ply in which steel cords are arranged at an angle of 70 to 90 degrees with respect to the tire equator C.

The carcass 9 expands into a substantially circular shape close to the natural cross section due to a high filling internal pressure of 2.4 kgf / cm ² or more, and the radius of curvature R9 is 0.5 to 0 of the carcass width W9 in the tread portion. Bends in the range of 6 times.

In this example, the tread portion 2 has a tread width WT substantially equal to the carcass width W9, and the tread surface 4A, which is the outer surface in the radial direction, has a large curvature of, for example, five times or more the radius of curvature R9. Bend with radius RT.

The tread portion 4 is provided with a tread rubber 16 whose outer surface in the radial direction forms the tread surface 4A, and the sidewall portion 5 is arranged outside the carcass 9 in the axial direction of the tire and has a radially outer end. Is provided with a sidewall rubber 17 that is in close contact with the tread rubber 16.

The outer surface of the tread rubber 16 in the axial direction of the tire forms a buttress surface 10 of the tire 2 which is continuous with the tread surface 4A via a tread edge E.

In the tire 2 for such a tire roller,
The rubber cover body 3 is attached. The rubber cover body 3 is, as shown in FIGS. 1 and 2, the tread surface 4 of the tire 2.
A cylindrical portion 11 in contact with A, and flange portions 1 provided on both sides of the cylindrical portion 11 and in contact with the buttress surface 10
An annular substrate having 2, 12 is provided.

The outer diameter of the rubber cover body 3 is set to be slightly smaller than the outer diameter of the tire 2, and the rubber cover body 3 is stretched and elastically compressed to move the rubber cover body 3 into the tire 2.
Can be attached to.

An adhesive may be interposed between the rubber cover body 3 and the tire 2.

The rubber cover body 3 is molded using oil resistant rubber. As the oil resistant rubber, for example, chloroprene rubber (C having a low volume expansion coefficient against light oil and excellent oil resistance) is used.
R) is preferably used.

It is known that the volume expansion of rubber with respect to a solvent, that is, swelling, is greatly influenced by the type of solvent, the type of rubber, the crosslink density, etc.
Items No. 4 are specified by JIS. However, they share the same main component of hydrocarbons, and therefore any gas oil can be used for volume expansion measurements.

It is known that the volume expansion can be suppressed by increasing the crosslink density, but excessively increasing the crosslink density leads to hardening of the rubber, loss of its elasticity and deterioration of tire performance. Therefore, by using a rubber composition having a low affinity for light oil, a rubber cover body is prepared by using an oil resistant rubber having a volume expansion coefficient of 6% or less when immersed in light oil at a temperature of 23 ± 2 ° C. for 1 hour. 3 can be molded.

That is, in general, the square root of the heat of vaporization per mol of a substance divided by its volume is SP (Solub).
It is referred to as an “Ility Parameter) value. For example, as shown in Table 1, when the SP values of the polymer and the solvent are close to each other, the affinity increases. Therefore, a rubber composition higher than the SP value of SBR and deviating from the SP values of isooctane and toluene, such as acrylonitrile-butadiene rubber (N
A single BR) or a mixture thereof with SBR or the like can be used as the oil resistant rubber.

[0026]

[Table 1]

In addition to NBR, for example, oil-extended SBR (OE
R) can also be suitably used as the low volume expansion rubber B (oil resistant rubber). At that time, two examples of the component of rubber B (B-1, B-
2) is shown in Table 2 together with the components of the conventional rubber A for tread, and FIG. 3 shows the relationship between the volume expansion coefficient of these rubbers A, B-1 and B-2 with respect to light oil and the immersion time.

[0028]

[Table 2]

The volume expansion rate test is in accordance with JIS K6301 12, 5, and 2 volume change tests except for the test temperature and the time of immersion in light oil.

The rubber cover body 3 is fixed to the tire 2 by its elastic compression, and covers the tire surface 4A and the buttress surface 10.

Therefore, the mixing amount of the oil resistant rubber forming the rubber cover body 3 into the tread rubber 16 can be made zero, and the various performances and qualities of the tread rubber 16 formed by SBR can be compared with those of conventional tires. Can be maintained at about the same as

Further, the rubber cover body 3 allows the tire surface 4
Light oil can be prevented from being absorbed by the tire 2 from A and the buttress surface 10, and the profile of the tread surface 4A can be kept substantially uniform.

The thickness of the rubber cover body 3 is set to 3 mm or more and 7 mm or less. If the thickness is less than 3mm,
Light oil may reach the tire surface 4A and the buttress surface 10, and conversely it is not necessary to make it larger than 7 mm.

[0034]

As described above, the oil resistant tire for a tire roller of the present invention comprises a rubber cover body using an oil resistant rubber and having a cylindrical portion in contact with the tread surface of the tire and a flange portion in contact with the buttress surface. Since it is attached by elastic compression to the tire, it is possible to prevent the absorption of light oil from the tread surface and buttress surface without impairing the tire performance, and it is possible to maintain the profile of the tread surface almost even by spraying light oil during rolling work. It is possible to form a smooth paved road surface.

[Brief description of drawings]

FIG. 1 is a meridional sectional view showing an embodiment of the present invention.

FIG. 2 is a perspective view illustrating a rubber cover body.

FIG. 3 is a diagram showing the relationship between the volume expansion coefficient for light oil and the immersion time.

FIG. 4 is a diagram for explaining a conventional technique.

[Explanation of symbols]

 2 Tire 3 Rubber Cover 4 Tread Part 4A Tread Surface 5 Sidewall Part 6 Bead Part 7 Bead Core 9 Carcass 10 Buttress Surface 11 Cylindrical Part 12 Flange Part E Tread Edge

Claims (1)

[Claims] 1. A tire for a tire roller having a carcass folded around a bead core of a bead portion from a tread portion to a sidewall portion, a cylindrical portion in contact with a tread surface of the tire, and a cylindrical portion of the cylindrical portion. A ring-shaped rubber cover body using oil resistant rubber having flange portions contacting the buttress surface of the tire which are provided on both sides and connected to the tread surface via the tread edge, is attached by elastic compression of the rubber cover body. Oil resistant tires for tire rollers.