JPH0440201B2 - - Google Patents

Description

[Detailed description of the invention]

The present invention relates to a solid tire for a so-called capsule liner used for conveyance within a steel pipe. In general, a capsule liner is a liner that is placed on the front or rear surface of a container-shaped vehicle body b, for example, as shown in FIG.
The solid tires C are installed radially,
It is transported in a blowgun shape through a steel conduit a using the wind pressure of compressed air as power. Furthermore, the five solid tires c... are mounted with a slip angle so as to rotate around the axis wear out. For example, the solid tires c used in such capsule liners are required to carry a large load, therefore have high load retention properties, and have small wheel outer diameters, but do not require characteristics such as ride comfort. Conventionally, as shown in FIG. 2, a tread rubber f is attached to a baseband e, and a polyurethane rubber is used as the tread rubber f. The rubber has a complex modulus E of 50 to 100 kg/cm ²
The loss coefficient (tan δ) was set in the range of 0.08 to 0.30. Furthermore, the tread rubber f is formed to have a substantially trapezoidal cross section, and its wall thickness is set in the range of 35 to 15 mm in order to suppress heat generation during running.
The noise leaking from the room was getting louder. For example, load
When running at 1600Kg at 36Km/h, approx.
It can reach up to 80 dB, and there is a problem in that due to pollution restrictions, it is not possible to lay conduit a particularly near private houses. On the other hand, it is effective to make the tread rubber thicker in order to alleviate the vibrations and shocks that generally cause 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 causes thermal deterioration and significantly reduces durability. The present invention was completed as a result of repeated research into the formulation and shape of treaded rubber in order to satisfy the required characteristics of maintaining durability and reducing vibration and noise. The elastic modulus is 20~50Kg/cm ² , the loss coefficient (tan
Basically, treaded rubber with a δ) of 0.05 or less is vulcanized and bonded to the outer circumferential surface of the baseband. DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a solid tire for a capsule liner according to the present invention will be described below with reference to the drawings. In FIG. 3, the solid tire 1 of the present invention is
Tread rubber 3 is vulcanized and bonded to the outer peripheral surface of a ring-shaped baseband 2. The tread rubber 3 has a contact surface 4 formed in an arcuate cross section with a radius R in the range of approximately 150 to 600 mm, and both ends of the contact surface 4 of the tread rubber 3 in the tire axial direction are bent through curved portions 4a. It is smoothly connected to the recess 9 of the side surface 7 without any step. Further, the recesses 9 are smoothly continuous in the circumferential direction, and the distance between the recesses 9 is smaller than the maximum width WT of the tread rubber 3. Here, "smoothly continuous in the circumferential direction" means that the concave portion 9 has no level difference such as an uneven portion, and the curved surface is continuous in the circumferential direction. In addition, in the case of Fig. 3, solid tire 1
The tire outer diameter D is 375mm, the tire width W is 147mm,
The height H of the tread rubber 3 is 68mm, and the ground contact radius R
is set to about 375mm. Also, the radius r of the recess 9
1 is approximately 25 mm, and the radius r2 of the curved portion 4a is approximately 12 mm. In this way, the height H of the tread rubber 3 is set to about 15 to 25% of the tire outer diameter D, and compared to conventional tires in which the height of the tread rubber is 10% or less of the tire outer diameter. It is set to large. The tire of the present invention has the above-mentioned height H with the intention of reducing vibration and noise.
It was developed with a focus on the complex modulus of elasticity E and the loss coefficient tan δ in order to reduce heat generation and increase durability on the premise that is larger than in conventional cases. For this reason, the complex modulus of elasticity E of the tread rubber 3 is set to 20
The range is ~50Kg/ ^cm2 . The complex modulus of elasticity E is
This is a measure of the hardness of the tread rubber 3 during running, and if it exceeds 50 kg/ ^cm2 , vibration absorption and mitigation will not be effective and noise suppression will not be achieved sufficiently.
If it is less than 20 kg/cm ² , the amount of deformation of the tread rubber during running becomes large, promoting heat generation and reducing durability. Furthermore, the loss coefficient (tan δ) affects the energy loss of the tread rubber 3, and by setting this value to 0.05 or less, the heat generation of the tread rubber 3 can be suppressed. Here, the complex modulus of elasticity E, the loss coefficient (tan
δ) Values measured using a viscoelastic spectrometer manufactured by Iwamoto Seisakusho at a temperature of 70°C, a frequency of 10 Hz, an initial strain of 10%, a dynamic strain of 2%, and a specimen length of 30 mm. The treaded rubber 30 is a composition in which a predetermined amount of carbon black is blended into a rubber component containing as a main component a diene rubber such as natural rubber, polyisoprene rubber, styrene-butadiene rubber, polybutadiene rubber, etc. alone or in a mixture. . Here, the particle size of carbon black is 250 to 70 mμ.
However, if it is smaller than 70 mμ, the resilience will be low and heat generation will be intense, while if it exceeds 250 mμ, the reinforcing effect will decrease, which is not preferable. Furthermore, from the viewpoint of the balance between the above-mentioned reinforcing properties and heat generating properties, the blending amount should be adjusted depending on the rubber component.
The amount should be in the range of 20 to 60 parts by weight per 100 parts by weight. In addition, the composition of the treaded rubber 3 includes zinc oxide,
It is blended in an amount of 3 to 5 parts by weight per 100 parts by weight of the rubber component, and as the blending amount increases, thermal conductivity improves, but cutting and elongation properties decrease, limiting the upper limit.
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 softeners such as oil are not included. Further, as described above, the end of the tread rubber 3 on the ground contact surface 4 smoothly transitions into the recess 9 provided on the side surface 7 via the curved portion 4a that has a curved surface such as an arc. The edges are particularly prone to distortion during running, so it is possible to prevent cracks or chipping that tend to occur when coming into contact with foreign objects.In addition, by forming the recess 9 on the side surface 7, it is possible to prevent repeated distortion during running. The stress of the tread rubber 3 due to deformation is dispersed throughout the tread rubber 3, reducing the heat generation effect and increasing the contact area with air, thereby increasing the heat dissipation effect. In this embodiment, a pair of grooves 6, 6 extending in the circumferential direction in a zigzag shape, for example, are added to the ground contact surface 4, and the depth d of the grooves 6 is in the range of about 15 to 30 mm. The distance l from the equator line C to the center of the groove 6 is selected to be in the range of about 10 to 40 mm, and the groove width W of the groove 6 is selected to be in the range of about 5 to 20 mm. This groove 6 is formed by the tread rubber 3 that supports high loads.
The heat dissipation effect is reduced by effectively dispersing stress, and 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, thereby increasing the heat dissipation effect and increasing durability. maintain sexuality. Note that the groove 6 is formed in 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. Further, the groove 6 can be of various shapes other than a zigzag shape extending in the circumferential direction, and if necessary, a groove narrower than the groove 6 may be added, or it can be partially or entirely independent. It can also be formed into a block pattern. Note that the groove 6 can be omitted. Furthermore, the solid tire 1 is made by roughening the upper surface of the baseband 2 by sandblasting or shotblasting, degreasing it with a solvent such as trichloride, and drying it.
A sheet-like body made by calendering the above-mentioned composition material, which has been kneaded in advance using a roll, a Banbury, etc., with an adhesive interposed therebetween, and having a width slightly wider than the width of the baseband 2 is applied to the outer peripheral surface of the baseband 2 until a predetermined diameter is obtained. The tread rubber 3 is vulcanized and bonded by winding it, placing it in a mold, and pressing it. Here, the vulcanization temperature is usually set in the range of 130°C to 160°C. As described above, since the solid tire for capsule liner of the present invention is formed using rubber with a specific complex modulus of elasticity and loss coefficient as the tread rubber, it has high shock vibration absorption ability and dispersion, and reduces durability due to heat generation. In combination with the fact that the height of the tread rubber can be made larger than that of conventional tires, a reduction in vibration and noise can be achieved. In addition, since the side surface has a smoothly continuous recess and is connected to the ground surface by a curved surface, it is possible to reduce tensile force, and there are no cutouts or sharp corners, reducing stress concentration and improving durability. Example Tire outer diameter 275mm, tire width 147mm, tire inner diameter
288 mm solid tires with various specifications shown in Table 1 were prototyped using the tread rubber shown in Table 2. This is installed in the capsule car shown in Figure 1,
Speed of 36km/in a steel pipe line with an inner diameter of 1000mm and a length of 3.6km
I ran it at h. By rotating in a spiral trajectory around the axis x, solid tires can carry a maximum load of 1600 kg per tire when facing downward and touching the inner surface of the tube.
Acts for 70 seconds. Also, when it is directed upward, the applied load is 0 kg and lasts for 105 seconds, and this state is repeated. The temperature rise and vibration noise of the tire under these driving conditions were measured. 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 drawings]

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. A solid tire for a capsule liner consisting of a ring-shaped baseband and tread rubber vulcanized and bonded to the outer peripheral surface thereof, wherein the tread rubber is mainly composed of diene rubber and has a complex modulus of elasticity of 20 to 50 kg. /cm ² , loss factor (tan δ)
is made of rubber having a diameter of 0.05 or less, and a concave portion is formed on the side surface of the tread rubber that continues smoothly in the circumferential direction, and the end of the axial direction of the contact surface of the arc of the tread rubber draws a curved surface and smoothly extends into the concave portion. This is a solid tire for capsule liners in which the distance between the recesses is smaller than the maximum width of the tread rubber in the axial direction of the tire.