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pneumatic tire

A technology for pneumatic tires and tires, applied in tire parts, tire tread/tread pattern, transportation and packaging, etc. Great, improve the effect of handling stability

Active Publication Date: 2015-11-04
THE YOKOHAMA RUBBER CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, if the ratio of the groove area in the tread portion is simply reduced, the on-snow performance will be reduced accordingly.
That is, performance on ice and performance on snow are in a contradictory relationship, and it is extremely difficult to balance both

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0065] The tire of Example 1 has image 3 In the tread pattern, the inclination angle θa of the first closed groove 23a is set to -17°, and the inclination angles θb and θc of the second closed grooves 23b and 23c are respectively set to +15°. The tire of Example 2 has Figure 8 The tread pattern has the same pattern as in Example 1, except that the first closed groove 23a is arranged at a position shifted from the transverse groove 2a that defines the blocks 11 of the block row 10 of the shoulder in the tire circumferential direction. structure.

[0066] For comparison, prepare to have the same image 3 Tires of Comparative Examples 1 and 2 with similar tread patterns. That is, the tire of Comparative Example 1 has Figure 10 The tread pattern of each block 21 is provided in each block 21 instead of providing the closed grooves 23a to 23c, and a transverse groove that crosses each block 21 is provided, and each block 21 is subdivided in the tire circumferential direction....

Embodiment 3

[0080] The tire of Example 3 has Figure 7 In the tread pattern, the inclination angle θa of the first closed groove 23a is set to -17°, and the inclination angles θb and θc of the second closed grooves 23b and 23c are respectively set to +15°. The tire of Example 4 has Figure 9 The tread pattern has the same pattern as that of Example 3, except that the first closed groove 23a is arranged at a position shifted from the transverse groove 2a that defines the blocks 11 of the block row 10 of the shoulder in the tire circumferential direction. structure.

[0081] For comparison, prepare to have the same Figure 7 Tires of Comparative Examples 3 and 4 with similar tread patterns. That is, the tire of Comparative Example 3 has Figure 12 The tread pattern of each block 21 is provided in each block 21 instead of providing the closed grooves 23a to 23c, and a transverse groove that crosses each block 21 is provided, and each block 21 is subdivided in the tire circumferential dir...

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PUM

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Abstract

The tire has bead portions provided on inner sides of side wall portions which are provided on both sides of tread portion. The tread portion includes longitudinal grooves (1a-1e) extended in tire circumferential direction and side grooves (2a-2f) extended in lateral width direction. The rows of blocks (10-60) have block units (11-61) including three closed grooves (23a-23c) which have open end adjacent to longitudinal grooves. The inclination angles of closed grooves with respect to tire width direction are selected among different angles.

Description

technical field [0001] The present invention relates to a pneumatic tire suitable for use in winter, and more specifically, to a pneumatic tire capable of improving ice performance and snow performance in a balanced manner. Background technique [0002] Conventionally, in pneumatic tires used in winter, represented by studless tires, a plurality of longitudinal grooves extending in the tire circumferential direction and a plurality of transverse grooves extending in the tire width direction are provided in the tread portion, and the tires pass through these longitudinal grooves. And the lateral grooves define a plurality of blocks, and each block is provided with a plurality of sipes extending in the tire width direction (for example, refer to Patent Document 1). [0003] In such a pneumatic tire used in winter, both performance on ice and performance on snow are required. In general, in order to improve performance on ice, a tread pattern is used that reduces the ratio of ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B60C11/03
CPCB60C11/11B60C11/0304B60C11/12B60C2011/0381B60C2011/0383B60C2011/1213B60C2011/1227B60C2011/1254
Inventor 长安政明古泽浩史
Owner THE YOKOHAMA RUBBER CO LTD