Pneumatic tire

A technology for pneumatic tires and tires, which is applied to heavy-duty tires, tire parts, tire treads/tread patterns, etc., can solve problems such as the influence of transition characteristics, and achieve improved transition characteristics, good handling stability, and improved handling stability. Effect

Active Publication Date: 2018-01-05
SUMITOMO RUBBER IND LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, there is a concern that the center of the tread (the position with the highest ground contact pressure) will affect the tr

Method used

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  • Pneumatic tire
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Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0121] Prototyped according to the specifications in Table 1 with figure 1 The basic tread pattern is a pneumatic tire of size 215 / 60R16, and the handling stability performance is tested. The test method is described below.

[0122]

[0123] The test tire installed on the rim of 16×7.0J is installed on the all-wheel of a FR car with a displacement of 2500cc under the condition of an internal pressure of 250kPa, and a driver drives the test route on a dry asphalt road, and passes the test. The driver's senses were used to evaluate characteristics related to grip performance, steering wheel feel, and responsiveness. The results are represented by a score of 100 in Example 1, and the larger the numerical value, the better the steering stability performance.

[0124] [Table 1]

[0125]

[0126] As can be seen from Table 1, it can be confirmed that the pneumatic tires of the examples have intentionally improved steering stability performance compared with the comparative ex...

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Abstract

Provided is a pneumatic tire, which is improved in transition characteristic during turning and achieves the good control stability. No grooves having width of 2 mm or more are formed in a crown land(10) and middle lands (11, 12) of the pneumatic tire. A first tread half (21) is provided with first sipes (25) less than 2 mm in width, and a second tread half (22) is provided with second sipes (26)less than 2 mm in width. The first sipes (25) extend smoothly from the crown land (10) to a shoulder land (13) through a crown main groove (3) and a shoulder main groove (5). The second sipes (26) extend smoothly from the crown land (10) to a shoulder land (14) through a crown main groove (4) and a shoulder main groove (6) without reaching a second tread ground contact edge (Te2) but to form an end. Third sipes (38) which are less than 2mm in width and extend in an axial direction of the tire are arranged between the second sipes adjacent in a circumferential direction in the middle lands.

Description

technical field [0001] The present invention relates to a pneumatic tire with improved handling stability. Background technique [0002] Conventionally, for the purpose of improving steering stability, Patent Document 1 proposes a pneumatic tire in which main grooves extending continuously in the tire circumferential direction are provided on the tire equator and on both sides thereof. In this pneumatic tire, by not providing a wide groove in the middle land portion, the rigidity of the middle land portion can be increased, and steering stability performance can be improved. [0003] Patent Document 1: Japanese Patent Laid-Open No. 2014-184828 [0004] In the above-mentioned pneumatic tire, the arc-shaped sipes provided in the middle land portion and the shoulder land portion can suppress a decrease in pattern rigidity, distribute loads in multiple directions, and improve steering stability. However, the sipe provided in the middle land portion and the sipe provided in the...

Claims

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Application Information

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IPC IPC(8): B60C11/03B60C11/04B60C11/12
CPCB60C2200/06B60C11/1263B60C2011/0388B60C11/125B60C11/1281B60C2011/0369B60C2011/0381B60C2011/0372B60C11/0304B60C11/1236B60C11/1259B60C11/1272
Inventor 若杉将史河越义史
Owner SUMITOMO RUBBER IND LTD
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