Pneumatic tire

A pneumatic tire, tire circumferential technology, applied to tire parts, tire tread/tread pattern, transportation and packaging, etc., can solve the problems of reduced handling stability and easy reduction of rigidity on dry roads, and prevent excessive rigidity Reduce, improve driving performance, suppress the effect of mutual crossing

Active Publication Date: 2013-03-27
SUMITOMO RUBBER IND LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] However, in the above-mentioned pneumatic tire, there is a problem that the rigidity of the land portion tends to be lowered due to the plurality of sipes, and the steering stability on a dry road surface is lowered.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0060] Based on the specifications in Table 1 a prototype was formed as figure 1 The pneumatic tires with the basic structure and the size of 225 / 65 / R17 were tested, and the braking performance on ice and the handling stability performance on dry roads of each tire were tested. The test method is as follows.

[0061]

[0062] Install each test tire on a 17×7.0J rim, and then install it on all the wheels of a 2000cc vehicle under the condition of an internal pressure of 200kPa, and drive straight on the ice road test route at a speed of 40km / h While applying full brakes, the distance until the vehicle comes to a stop is measured. The results are expressed by an index with the reciprocal of the value of the stopping distance of the tire of Comparative Example 1 (conventional art) as 100, and the larger the numerical value, the better.

[0063]

[0064] Under the same conditions as described above, on a dry asphalt road test course, handlebar responsiveness, rigidity, chara...

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Abstract

A pneumatic tire in the invention can maintain operation stability on a dry road surface and improve running performance on an icy and snow road. The pneumatic tire forms a tire crown land part (5) between the tire crown circumferential trenches (3, 3) via disposing of a plurality of tire crown circumferential trenches (3) continuously extending along the circumference of a tire on a tread part (2). The tire crown land part (5) is provided with a land part edge (9) along the circumferential trenches of the tire crown land part (5). A plurality of cutter groove pattern groups (13) are disposed at the circumference of the tire, each cutter groove pattern group 13 comprises more than three cutter groove patterns (12) inclining and extending from a land part edge (9a) at one side in the same direction at an angle of 10-80 degrees relative to the axial direction of the tire, and forming ends in the tire crown land part (5). An angle of the cutter groove pattern group (13) gradually increases from a cutter groove pattern (12s) disposed at one side of the circumference of the tire to a cutter groove pattern (12t) disposed at the other side, and an end position (12e) of the cutter groove pattern (12) is close to a land part edge (9b) at the other side of the land part.

Description

technical field [0001] The present invention relates to a pneumatic tire capable of maintaining steering stability on dry roads and improving running performance on icy and snowy roads. Background technique [0002] Conventionally, in order to improve running performance on icy and snowy roads, there is known a pneumatic tire in which edge components are increased by providing sipes extending parallel to each other in the land portion of the tread portion. As related technologies, there are the following Patent Documents 1 and 2. [0003] Patent Document 1: Japanese Patent Laid-Open No. 2006-51891 [0004] Patent Document 2: Japanese Patent Laid-Open No. 2006-160107 [0005] However, in such a pneumatic tire as described above, there is a problem that the rigidity of the land portion tends to decrease due to the plurality of sipes, and furthermore, the steering stability on a dry road surface decreases. Contents of the invention [0006] The present invention has been m...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B60C11/03B60C11/12
CPCB60C11/1236B60C11/04B60C11/12
Inventor 西胁隆志
Owner SUMITOMO RUBBER IND LTD
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