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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 carcass cord breakage, rigidity reduction, and poor handling stability, etc., to achieve tensile stress reduction Effects of small size, reduced mass, and improved pinch-off resistance

Active Publication Date: 2017-06-09
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 pneumatic tire of the present invention realizes reduction in weight and improves pinch resistance and steering stability performance in a balanced manner. A pneumatic tire has a carcass (6) extending from a tread portion (2) through a sidewall portion (3) to a bead core (5) of a bead portion (4), and a tire diameter arranged on the carcass (6). The belt layer (7) facing outward and inside the tread portion (2), and the bead portion (4) are arranged on the tire axially outer side of the carcass (6) and form the outer side of the bead portion (4) edge glue (10). The belt layer ( 7 ) includes a plurality of belt plies having belt cords inclined at an angle of 15-45° with respect to the tire equator (C). A pair of sidewall reinforcing layers (12) disposed between the carcass (6) and the belt layer (7) are respectively provided on the sidewall portions (B) on both sides. The thickness (dc) of the bead rubber (10) at a height of 25 mm from the bead reference line (BL) to the outside in the tire radial direction 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 Patents(China)
IPC IPC(8): B60C9/18B60C9/02B60C15/00
CPCB60C9/09B60C9/2009B60C2009/2016B60C2009/2019B60C2009/2038B60C2009/2041B60C2015/0614Y10T152/10765
Inventor 松本忠雄
Owner SUMITOMO RUBBER IND LTD