Runflat tire with improved carcass
A technology for tires and carcass, which is applied to the reinforcement layer of pneumatic tires, tire parts, tire tread/tread pattern, etc., and can solve problems such as high rolling resistance
Inactive Publication Date: 2000-08-30
THE GOODYEAR TIRE & RUBBER CO
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- Abstract
- Description
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- Application Information
AI Technical Summary
Problems solved by technology
However, although this method has hoped to make a satisfactory solution to the load support and ride performance, it presents a slightly higher rolling resistance in the normal inflation state.
Method used
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Examples
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example 1
[0163] The following rubber compositions are provided and are representative of rubber compounds having the properties listed in Table 1.
[0164] Rubber compounds were prepared and compounded using conventional rubber compounding methods, and included the materials shown in Table 2, representing the surface layers that could be planned for filler strips 42 and 46 and one or more plies 38 and 40. Rubber material. The amounts of raw materials indicated have been rounded for ease of illustration in this example.
[0165] Table 2
(by weight)
ply surface
filler strip
90
80
Isoprene / Butadiene Rubber ②
10
0
Polybutadiene (cis 1,4-) rubber ③
0
20
55
55
Silica and coupling agent
6
6
5
8
Accelerators (sulfenamides)
4
2
Sulfur (in...
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A runflat radial ply pneumatic tire 10 has a carcass 30 which has a pair of sidewalls 20, each sidewall being reinforced with at least two sidewall fillers or runflat inserts 42, 46 and at least two cord reinforced plies 38, 40 and a bead core 26. The tire has one or more reinforcing belts 36. Each sidewall has at least one ply 38 or 40 reinforced with cords, the cords have a modulus E of X, X being at least 10 GPa. At least one ply has a turnup end 32 wrapped around the bead core 26. A first ply 38 or 40 is reinforced with substantially inextensible cords having a modulus E greater than X of the cords of the other ply. The second ply 38 or 40 is spaced from the first ply 38 or 40 by the second filler or runflat insert in the sidewall 20.
Description
technical field [0001] The present invention relates to tires, and in particular to pneumatic tires which can be used in an uninflated state. The carcass structure of this tire can match the ride performance of conventional tires, and can be manufactured without exhibiting the weight problems normally associated with run flat tires. Background of the invention [0002] For inflated run flat tires, i.e. tires that can be used in the uninflated state, various tire constructions have been proposed, one of which is the method described in U.S. Patent No. 4 111 249 entitled "Belted Tires" , it is proposed to set a hoop or endless belt with a width similar to that of the tread directly under the tread. The hoops combine with the rest of the tire structure to support the vehicle's weight when not inflated. Such a belted tire actually stretches the cords of the ply even in the uninflated state. [0003] Another method that has been used is simply to reinforce the sidewall by incr...
Claims
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IPC IPC(8): B60C9/00B60C9/08B60C9/18B60C9/20B60C9/22B60C11/00B60C15/00B60C15/04B60C17/00
CPCB60C9/22B60C15/0045B60C15/0072B60C9/2009B60C9/08B60C15/0018B60C17/0009B60C9/0207B60C9/18B60C17/0018B60C11/00B60C15/04B60C11/0332B60C2017/0081B60C17/00B60C15/0607B60C2009/0253Y10T152/10873Y10T152/10837Y10T152/10513Y10T152/10864Y10T152/10828
Inventor T·R·奥尔雷A·普拉卡斯R·E·哈尔G·E·图布
Owner THE GOODYEAR TIRE & RUBBER CO