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Tire

A tire and tire circumferential technology, applied to tire parts, tire tread/tread pattern, rolling resistance optimization, etc., can solve problems such as uneven wear, increased impact sound and air pumping sound, and achieve endurance Improved uniform wear performance, improved noise performance, and reduced impact noise

Pending Publication Date: 2022-07-08
SUMITOMO RUBBER IND LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, since the inner shoulder lug groove and the outer shoulder lug groove of Patent Document 1 extend in the tire axial direction, the impact sound when the tire touches the ground and the air pumping sound when the tire lifts off the ground increase, and there is room for improvement in noise performance.
In addition, since the outer shoulder lateral grooves of Patent Document 1 extend obliquely with respect to the tire axial direction, the acute-angled portion formed between the outer shoulder main grooves extending in the tire circumferential direction becomes a cause of uneven wear.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0074] manufactured with figure 1 Pneumatic tires (size: 215 / 60R16) of the basic pattern and based on the specifications of Table 1, and their respective properties were tested. In addition, the main common specifications are as follows.

[0075]

[0076] Each groove depth: 8mm

[0077]

[0078] Angle θ3 of the third groove portion: 30° (90° only in Comparative Example 1)

[0079] θa=θb

[0080] L1 is the same in all comparative examples and all examples.

[0081]

[0082] Groove depth of the second shoulder lateral groove: 6mm

[0083] Groove depth of shallow groove: 1mm

[0084] The test method is as follows.

[0085]

[0086] The test driver drove 10,000 km on a dry pavement using a rear-wheel drive vehicle with a displacement of 2,000 cc with test tires mounted on all wheels. After that, the state of occurrence of uneven wear generated in the shoulder land portion was evaluated based on the senses of the test driver. The results are shown by a score with Co...

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PUM

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Abstract

A tire (1) includes a shoulder land portion (7) in a tread portion (2). The shoulder land portion (7) is provided with a plurality of first shoulder lateral grooves (10) extending axially inward from the tread end (Te) and terminating within the shoulder land portion (7). The first shoulder lateral groove (10) includes a first groove portion (11) extending in the axial direction of the tire from the tread end (Te), a second groove portion (12) extending in the axial direction of the tire at a position further inward than the first groove portion (11) in the axial direction of the tire and different from the first groove portion (11) in the circumferential direction of the tire, and a third groove portion (13) connecting the first groove portion (11) and the second groove portion (12).

Description

technical field [0001] The present invention relates to a tire capable of achieving both noise performance and uneven wear resistance. Background technique [0002] Conventionally, a tire including a tread portion in which a ground contact surface is formed between tread ends is known. For example, the following Patent Document 1 proposes a tire in which the tread portion is provided with inner shoulder lug grooves provided in the inner shoulder land portion and outer shoulder lateral grooves provided in the outer shoulder land portion to exert superiority. Handling stability and wet performance. [0003] Patent Document 1: Japanese Patent Laid-Open No. 2018-079741 [0004] However, since the inner shoulder grooves and the outer shoulder lateral grooves of Patent Document 1 extend in the tire axial direction, the impact sound when the tire touches the ground and the air pumping sound when the tire lifts off the ground increase, and there is room for improvement in noise pe...

Claims

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Application Information

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IPC IPC(8): B60C11/01
CPCB60C11/04B60C11/0306B60C2011/0362B60C2011/0365B60C2011/0367B60C2011/0372B60C2011/0381B60C11/0332B60C2011/0353B60C11/13B60C2011/1231B60C11/1204B60C11/0302
Inventor 中岛幸一
Owner SUMITOMO RUBBER IND LTD