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Pneumatic tire

A technology for pneumatic tires and tires, which is applied to the reinforcement layer of pneumatic tires, tire parts, tire edges, etc., which can solve the problems of poor handling stability, reduced rigidity, and broken carcass cords, so as to reduce the weight, The effect of reducing tensile stress and improving pinch-off resistance

Active Publication Date: 2014-10-01
SUMITOMO RUBBER IND LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, in a pneumatic tire that has been thinned as described above, when the tire rotates and touches the ground, the distance between the carcass cords in the sidewall portion is widened to form a so-called mesh, thereby reducing the rigidity.
Therefore, there is a problem of a pinch cut in which the carcass cord in that part breaks due to a large bending deformation caused by riding on a protrusion such as a curb, for example.
In addition, there is also a problem that the steering stability performance of the pneumatic tire with low rigidity of the sidewall portion deteriorates.

Method used

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Examples

Experimental program
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Effect test

Embodiment

[0055] Prototypes based on the specifications in Table 1 have figure 1 The basic structure of the tire shown is a pneumatic tire with a size of 195 / 65R15, and the pinch resistance performance, handling stability performance and tire quality of each tire are tested. In addition, the main common specifications are as follows.

[0056] Ground width TW: 142mm

[0057] Width W1 / TW of the first belt cord: 103%

[0058] The width W2 / TW of the second belt cord: 95%

[0059] Carcass cord

[0060] Cord Material: Polyester

[0061] Cord spacing: 0.08mm

[0062] The diameter of the cord: 0.54mm

[0063] Cord angle θ1: 90°

[0064] belt cord

[0065] Cord Material: Steel

[0066] Cord spacing: 0.13mm

[0067] The diameter of the cord: 0.54mm

[0068] Cord angle θ2: 24°

[0069] sidewall reinforcement

[0070] Cord material: Kevlar (registered trademark)

[0071] The diameter of the cord: 0.5mm

[0072] The minimum thickness dm of the sidewall rubber: 4.0mm

[0073] Rubber h...

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Abstract

The present invention relates to a pneumatic tire having improved pinch cut resistance and handling stability in a balanced manner while the weight thereof is reduced. The pneumatic tire includes a carcass (6) extending from a tread portion (2) through sidewall portions (3) to bead cores (5) in bead portions (4), a belt layer (7) disposed radially outward of the carcass (6) and inward of the tread portion (2), and clinch rubbers (10) disposed in the bead portions (4) axially outward of the carcass (6) and forming outer surfaces of the bead portions (4); the belt layer (7) is composed of belt plies having belt cords tilted at an angle of 15 DEG to 45 DEG relative to a tire equator (C); at respective buttress portions (B) on both sides, two buttress reinforcing layers (12) are disposed between the carcass (6) and the belt layer (7); at thickness (dc) of each clinch rubber (10) at a location which is at a height of 25 mm radially outwardly from a bead base line BL is 3 to 5 mm.

Description

technical field [0001] The present invention relates to a pneumatic tire that achieves weight reduction and improves pinch resistance performance and steering stability performance in a balanced manner. Background technique [0002] In recent years, in order to improve the fuel efficiency of vehicles, it is required to reduce the weight of pneumatic tires. The reduction in weight of a pneumatic tire is mainly achieved by reducing the thickness (thinning) of the rubber material forming the outer skin portion of the tire. The place where thinning is performed includes the sidewall portion between the tread portion and the sidewall portion. [0003] However, in the pneumatic tire that has been thinned as described above, when the tire rotates and touches the ground, the intervals between the carcass cords in the sidewall portion are separated to form a so-called mesh, thereby reducing the rigidity. For this reason, there is a problem of a pinch cut in which the carcass cords ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B60C9/18B60C9/02B60C15/00
CPCB60C2009/2016B60C9/2009B60C2009/2038B60C2009/2019B60C19/00Y10T152/10765B60C2015/0614B60C9/09B60C2009/2041
Inventor 松本忠雄
Owner SUMITOMO RUBBER IND LTD