Adhesive bonding and miscellaneous chemical manufacture – Methods – Surface bonding and/or assembly therefor
Patent
1989-04-14
1991-07-16
Weston, Caleb
Adhesive bonding and miscellaneous chemical manufacture
Methods
Surface bonding and/or assembly therefor
152531, 152533, 156123, 156130, 156416, B29D 3044
Patent
active
050321986
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
This invention relates to a pneumatic radial tire equipped with a band for reinforcing a belt and a method for manufacturing the same, and further relates to an apparatus for forming the band, and a method of and apparatus for forming a belt-band-tread rubber assembly.
BACKGROUND ART
Pneumatic radial tires having a belt in which metallic cords are arranged and which is disposed in the tread portion have been conventionally attached to high performance passenger cars, and high-speed durability, high-speed driving stability and steerability have been accomplished owing to a strong hooping effect of the belt. The conventional speed range from 100 to 200 km/h, however, has been accelerated these days, and some passenger cars to be driven at 200 km/h or more, and sometimes at 300 km/h, have been introduced. In the field of racing cars, machines which are driven at such a speed range already exist, but the driving is only under limited conditions, so that the tires mounted on them have been manufactured by sacrificing general performance requirements in ordinary driving, for example, wearing resistance and fuel economy. Hence, these tires are unable to withstand general use.
If conventional radial tires having a metallic cord belt are used in the high-speed driving as mentioned above, their tread portions are deformed by centrifugal force and repeated distortions are generated in the tread portion. This deformation appears as various phenomena depending on the size, structure and materials of the tire, for example, as a lifting phenomenon in which the outer diameter at the shoulder portion increases, a phenomenon in which the outer diameter at the center portion increases and the radius of curvature of the tread decreases or the surface becomes an irregular curve, or a standing wave phenomenon.
Furthermore, owing to the heat generated by the repeated distortion in the tread caused by such a deformation, the temperature at the tread portion rapidly rises and the adhesion between the metallic cord surface and the rubber in the belt is broken; that is, so-called ply separation occurs. In particular, the tires used in such a high-speed driving as described above require a broad ground contact area to secure the grip on the road surface and, therefore, a flattened tire having a wide tread is employed. In such a low-profile flattened tire having a wide tread, since the occupied rate of the tread portion in the entire tire is large, the above-mentioned phenomena of deformation and heat generation tend to occur.
Use of a rubber with a small loss tangent (tan .delta.) is effective for decrease of the heat generation, but when such a rubber with a small loss tangent (tan .delta.) is employed, the grip lowers and required high motional performances are hard to obtain.
Also, decrease of the deformation at the tread portion without changing the formulation of the tread rubber can be achieved by raising the hooping effect of the belt, but if the number of plies of the belt composed of metallic cords is increased, the weight of the tire increases, thus exerting adverse effects on the high-speed property of the entire car.
To solve these problems, a band formed by arranging a multiplicity of independent cords parallel with each other in the circumferential direction of the tire, adhering with rubber, and shaping into a sheet is disclosed in Japanese Patent Publication Kokai No. 47-14805, and Japanese Patent Publication Kokoku No. 55-45402. This band, however, has at least one joint portion extending in the widthwise direction. The stiffness in the circumferential direction decreases at this joint portion, thus large distortion tends to occur to induce breakage. In addition, the joint portion may impair the uniformity of the tire. Accordingly, the band is not sufficient for use in the high speed range described above. The tire having such a band makes no trouble in ordinary speed range but in a high speed range as fast as more than 200 km/h or more than 300 km/h, it is impossible to prevent deformations cause
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Kadowaki Katsunori
Kojima Yoshihide
Miyanaga Yoshinobu
Sakuno Hiroaki
Takami Masao
Knable Geoffrey L.
Sumitomo Rubber Industries Ltd.
Weston Caleb
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