JPS6358721B2 - - Google Patents

Description

[Detailed description of the invention]

The present invention relates to a solid tire suitable for use in so-called capsule vehicles used for conveyance within steel pipelines. In general, a capsule car has, for example, five solid tires c mounted on the front and rear surfaces of a container-shaped car body b, as shown in Fig. 1, and compressed air is passed through a steel conduit a. It is transported in the shape of a blowgun using wind pressure as power. For example, the solid tires c used in such a capsule vehicle d are required to carry a large load, therefore have high load retention properties, and have a small wheel outer diameter, but do not require characteristics such as ride comfort. Conventionally, as shown in Fig. 2, the tread rubber f attached to the baseband e is made of polyurethane and has a generally trapezoidal cross section, and its thickness is in the range of 35 to 15 mm to suppress heat generation during running. As a result, there is a problem of severe vibration and noise when driving. For example, load
When running at 1600Kg at 36Km/h, approx.
This can reach as high as 80 dB, causing the problem that conduit a cannot be constructed especially near private houses due to pollution restrictions. On the other hand, it is generally effective to make the tread rubber thicker in order to alleviate the vibration impact that causes noise when the tire is running, but at this time, the heat generated by the tire due to running accumulates, and the heat dissipation effect decreases. This leads to thermal deterioration and significantly reduces durability. The present invention was completed as a result of various studies regarding the formulation and shape of tread rubber in order to satisfy the required characteristics of maintaining durability and reducing vibration and noise. Solid tire for capsule liner of the present invention (hereinafter referred to as solid tire)
is a carbon black with a particle size of 120 to 190 mμ to 100 parts by weight of a rubber component made by mixing 100 to 75% by weight of natural rubber and 0 to 25% by weight of butadiene rubber.
A tread rubber made of a composition containing 40 to 60 parts by weight of fine thermal black and 3 to 5 parts by weight of zinc oxide was vulcanized and adhered to the outer circumferential surface of the baseband, and grooves were formed on the ground surface of the tread rubber. It is characterized by An embodiment of the solid tire of the present invention will be described below based on the drawings. In FIG. 3, the solid tire 1 of the present invention is
A tread rubber 3 is pasted on the baseband 2. The tread rubber 3 has its contact surface 4 with a radius of approximately
The cross section is formed into a circular arc with a range of about 150 to 600 mm, and a pair of grooves 6, 6 are formed in the ground plane 4 in a zigzag shape extending in the circumferential direction. The depth d of the groove 6 is 15 to 30 mm.
It is within the range of
The distance l to the center of is in the range of about 10 to 40 mm,
In addition, the groove width W of the groove 6 is selected to be within a range of about 5 to 20 mm. This groove 6 reduces the heat generation effect by effectively dispersing stress in the tread rubber 3 that supports a high load, and furthermore, even if heat generation occurs, the groove 6 is provided near the base of the tread rubber 3 where the heat storage effect is particularly severe. 6, the heat dissipation effect is enhanced and durability is maintained. Note that the groove 6 is formed into a circular arc that smoothly continues from the side wall 6a of the groove 6 toward the bottom 6b in order to prevent cracks from occurring due to stress concentration. In addition to the zigzag shape extending in the circumferential direction, the groove 6 may have a groove smaller in width than the groove 6, if necessary, or may be formed partially or entirely into a combination of independent blocks. good. Next, the end of the tread rubber 3 on the contact surface 4 is transferred to a gentle concave portion 9 provided on the side surface 7 via a curved portion 4a that has a curved surface such as an arc. . The edges are particularly susceptible to distortion during running, and the above-mentioned shape is adopted to prevent cracks or chipping that tend to occur when coming into contact with foreign objects.
By forming the recesses 9 in the tread rubber 3, the stress of the tread rubber 3 due to repeated deformation during running can be dispersed throughout the tread rubber 3, reducing the heat generation effect and increasing the contact area with air to enhance the heat dissipation effect. be. The tread rubber 3 is formed using a composition material in which carbon black made of fine thermal black is blended with a rubber component made of natural rubber alone or natural rubber mixed with 25 parts by weight or less of butadiene rubber. As mentioned above, the present invention has a cross-sectional shape that effectively relieves stress caused by bending deformation during running, and as the composition of the tread rubber 3, conventionally commonly used polyurethane is generally too hard to exhibit sufficient effects. Therefore, diene rubbers, especially materials with the above formulations, are used. If the butadiene rubber exceeds 25 parts by weight, the impact resistance to breakage will decrease, which is not preferable. In addition, the particle diameter of the fine thermal black is 190 to 120 m.
A material in the μ range is used, but if it is smaller than 120 mμ, the resilience will be small and heat generation will be intense.
On the other hand, if it exceeds 190 mμ, reinforcing properties will deteriorate, which is not preferable. Furthermore, from the viewpoint of the balance between the reinforcing properties and heat generating properties mentioned above, the amount of compounding is determined by adjusting the amount of rubber components.
The amount ranges from 40 to 60 parts by weight per 100 parts by weight.
In addition, the composition of Toled Rubber 3 contains 3 to 5 parts by weight of zinc oxide per 100 parts by weight of the rubber component, but as the amount added increases, thermal conductivity improves, but cutting and elongation tend to decrease. . In addition, compounding agents such as stearic acid, anti-aging agents, and vulcanizing agents are added to the composition of the tread rubber 3, but hardening agents such as oil are not included. In the solid tire 1 of the present invention, the top surface of the baseband 2 is roughened by sandblasting or shotblasting, then degreased and cleaned with a solvent such as trichloride, and after drying, an adhesive is applied to the surface of the baseband 2. A sheet-shaped body made by calendering the above-mentioned composition material, which has been kneaded in advance with a roll, banbury, etc., with a width slightly wider than the width of the baseband 2, is wound around the outer peripheral surface of the baseband 2 until a predetermined diameter is obtained, and then It is manufactured by placing it in a mold and press vulcanizing it. Here, the vulcanization temperature is usually set in the range of 130°C to 160°C. As mentioned above, the solid tire of the present invention is composed of tread rubber with a specific shape and combination of compounds, so it has high shock vibration absorption and dispersion properties, effectively prevents deterioration of durability due to heat generation, and reduces vibration and noise. mitigation can be achieved. Example Tire outer diameter 375mm, tire width 147mm, tire inner diameter
We prototyped 288mm solid tires with various specifications shown in Table 1. As shown in Figure 1, this was attached to a capsule car and was driven inside a steel pipe line with an inner diameter of 1000mm and a length of 3.6km at a speed of 36km/h and the maximum load per wheel.
The temperature rise and vibration noise of the tire were measured under conditions where the load was alternated between 1600Kg for 70 seconds and a minimum of 0Kg for 105 seconds. The increased temperature is the maximum temperature inside the tire, and the vibration noise is a relative value to Comparative Example 1. From Table 1, it can be seen that the examples of the present invention significantly reduce vibration noise.

【table】

【table】

【table】 [Brief explanation of the drawing]

FIG. 1 is a schematic perspective view showing a capsule vehicle, FIG. 2 is a sectional view showing a conventional solid tire, and FIG. 3 is a sectional view showing an embodiment of the tire of the present invention. 2...Baseband, 3...Treaded rubber, 4
...Ground surface, 4a...Curved portion, 6...Groove, 7...
Side surface, 9... recess.

Claims (1)

[Scope of Claims] 1. 100 parts by weight of a rubber component made by mixing 100 to 75% by weight of natural rubber and 0 to 25% by weight of butadiene rubber, and carbon black with a particle size of 120 to 190 mμ.
A solid tire for a capsule liner, characterized in that a tread rubber made of a composition containing 40 to 60 parts by weight of fine thermal black and 3 to 5 parts by weight of zinc oxide is vulcanized and adhered to the outer peripheral surface of a baseband. 2. The capsule according to claim 1, wherein the tread rubber has a gentle recess formed on its side surface, and the end of the contact surface of the tread rubber forms a curved surface and smoothly transitions to the side surface of the tread rubber. Solid tire for liner.