Pneumatic radial tire

A radial tire, tire technology, applied in the reinforcement layer, tire parts, transportation and packaging of pneumatic tires, etc., can solve problems such as reduced handling stability and difficulty

Inactive Publication Date: 2006-08-30
SUMITOMO RUBBER IND LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] However, although the aforementioned method improves the road noise performance by reducing the tire rigidity, on the other hand, it causes a problem that the steering stability is lowered.
Therefore, there is an inverse relationship between road noise performance and handling stability, and it is very difficult to achieve high levels of both

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0048] form figure 1 The tire size of the structure was trial-manufactured according to the specifications in Table 1. 205 / 55R16 car radial tires were trial-manufactured. At the same time, the handling stability, ride feeling and road noise performance of each test tire were tested and compared. All tires are of the same specification except for those listed in Table 1.

[0049] In addition, the belt layer is the number of plies (2 sheets), belt cords (steel cords), cord angle (22 degrees), and the number of cord implants (40 cords / 5cm).

[0050] (1) Handling stability and ride feeling:

[0051] Under the conditions of rim (16×6.5JJ) and internal pressure (220kPa), install the test tire on all the wheels of the vehicle (2000CC, FF vehicle), and run it on the test road according to the driver's feeling evaluation The handling stability and ride feeling at the time of the test were evaluated on a 10-point scale, while the past example was rated as 6 points. The larger the val...

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Abstract

A pneumatic radial tire has a carcass composed of radially inner and outer carcass plies. A complex elastic modulus E*1 of the topping rubber of the inner carcass ply is different from a complex elastic modulus E*2 of the topping rubber of the outer carcass ply, and a ratio E*1 / E*2 is 0.95 or lower or 1.05 or higher.

Description

technical field [0001] The present invention relates to a pneumatic tire having improved handling stability and road noise performance. Background technique [0002] In the past, in order to improve the noise performance of the tire, especially to improve the road noise performance, the following means were often adopted, that is, the carcass cords constituting the carcass were used in the carcass with low rigidity materials, or the number of tires per unit width was reduced. The number of implants (weft density) reduces the rigidity of the tire and suppresses the occurrence of sound. The reason for this is that if the tire rigidity is lowered, the (noise) input from the road surface can be alleviated, and the vibration of the tread portion itself to the road surface can be reduced. [0003] However, the aforementioned method improves the road noise performance by lowering the tire rigidity, but on the other hand causes a problem of lowering ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B60C9/02B60C9/08B60C9/04
CPCB60C9/08B60C2009/0276
Inventor 半谷正裕
Owner SUMITOMO RUBBER IND LTD
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