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Pneumatic tire

A technology of pneumatic tires and tires, applied in tire parts, tire treads/tread patterns, transportation and packaging, etc., can solve problems such as deterioration of driving performance and decrease in rigidity of tread portions, and achieve improved performance on snow, snow column shearing, etc. The effect of increased shear force and shear force of large snow column

Active Publication Date: 2010-08-18
THE YOKOHAMA RUBBER CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, when the number of grooves and sipes is increased to improve on-snow performance, the rigidity of the tread portion decreases due to the decrease in the area of ​​the land portion, and the running performance on dry roads in particular deteriorates.

Method used

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  • Pneumatic tire
  • Pneumatic tire
  • Pneumatic tire

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0045] For the following pneumatic tires, conventional examples and tires of Examples 1 to 6 in which the specific structure of the tread portion was set as shown in Table 1 were produced. The above-mentioned pneumatic tire has a tire size of 175 / 65R14, two first main grooves extending in the tire circumferential direction are provided in the central area when the ground contact width of the tread portion is divided into three equal parts, and the outer sides of the two sides of the central area are provided. One second main groove extending in the tire circumferential direction is provided in each region, and a plurality of lateral grooves extending in the tire width direction from the ground contact end in the tire width direction to the central region are provided in the tread portion. These main grooves and The lateral grooves are provided with a plurality of sipes in land portions divided by the tread portion.

[0046] The previous example has Figure 9 tread pattern of ...

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Abstract

Provided is a pneumatic tire having snow performances which are capable of being enhanced without sacrificing its running performance on dry road surfaces. A pneumatic tire of the invention includes two first main grooves, a plurality lateral grooves and a plurality of sipes in a tread part. In the pneumatic tire, a groove wall surface, of each first main groove, closer to a tire equatorial line is formed so as to cyclically repeat, in the tire circumferential direction, a change in an inclination angle of the groove wall surface to a direction normal to a tread, the change being a gradual increase from a minimum value of 0 DEG to 15 DEG to a maximum value of 15 DEG to 45 DEG. In places where the inclination angel of the groove wall surface, of the first main groove, closer to the tire equatorial line, is at its maximum, no lateral grooves communicate with the first main groove, and in the places, the other groove wall surface, of the first main groove, closer to a corresponding contact end extends uninterruptedly.

Description

technical field [0001] The present invention relates to a pneumatic tire suitable as a tire for icy and snowy roads, and more specifically, to a pneumatic tire capable of improving performance on snow without sacrificing running performance on dry roads. Background technique [0002] Conventionally, as a tire for icy and snowy roads, it has been proposed that a plurality of main grooves extending in the tire circumferential direction and a plurality of lateral grooves extending in the tire width direction be provided in the tread portion, and that the main grooves and the lateral grooves are formed in the tread portion. A pneumatic tire in which a plurality of sipes are provided on the divided land portion (for example, refer to Patent Document 1). [0003] In such a pneumatic tire, on-snow performance is ensured by the corner effect (corner effect) of the groove and the sipe. Therefore, by increasing the number of grooves and sipes and increasing the total length of their ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B60C11/03
CPCB60C11/13B60C2011/0381B60C2011/0388B60C2011/1338B60C11/12B60C11/0306B60C11/1392B60C2011/1213B60C11/1384B60C11/1323B60C2011/0346B60C2011/133
Inventor 大泉尚也
Owner THE YOKOHAMA RUBBER CO LTD
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