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Pneumatic tyre

A technology for pneumatic tires and tires, applied in tire parts, tire treads/tread patterns, transportation and packaging, etc., can solve the problems of small axial friction, easy lateral sliding, and low handling stability. , to achieve the effect of improving friction, improving handling stability and performance on snow, and improving performance on snow

Active Publication Date: 2016-03-23
SUMITOMO RUBBER IND LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, in the tire of Patent Document 1, the center land portion tends to be easily strained, and the steering stability on dry roads tends to be low.
[0004] In addition, in the tire of Patent Document 1, the edge components extending along the tire circumferential direction are only the center main groove and the bezel of the shoulder main groove, so the frictional force in the tire axial direction on snow is small, and it is easy to ride on snow, for example. problem with horizontal scrolling

Method used

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Examples

Experimental program
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Embodiment

[0089] Based on the specifications in Table 1, prototypes with figure 1 The basic pattern of pneumatic tires. As a comparative example, such as Figure 10 As shown, a tire without a central shallow groove and a shoulder auxiliary groove was trial-manufactured. The handling stability on dry road, wet road performance, and on-snow performance of each test tire were tested. The common specifications of each test tire are as follows.

[0090] Tire size: 185 / 65R15

[0091] Rim size: 15×5.5

[0092] Tire internal pressure: 200kPa

[0093] Tread contact width TW: 132mm

[0094] The groove width W3 of the shoulder main groove and the groove width W4 of the center main groove: 9.0mm

[0095] The groove depth d1 of the shoulder main groove and the groove depth d2 of the center main groove: 7.4mm

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Abstract

The present invention provides a pneumatic tyre capable of evenly improving steering stability on a dry roadway and performance on snow. The pneumatic tyre (1) is provided with a pair of tyre shoulder main channels (3) and a center main channel (4) at a tyre surface part (2), so as to obtain a pair of tyre shoulder land parts (7) and a pair of center land parts (8). The ratio W1 / W2 of the width W1 of the tyre shoulder land part (7) and the width W2 of the center land part (8) is 1.2-1.6. The center land parts (8) are provided with a plurality of center shallow channels (12) which extend obliquely relative to the axial direction of the tyre from the tyre shoulder main channels (3) and form terminals in the center land parts (8). The tyre shoulder land parts (7) are provided with, at the side of the tyre shoulder main channels (3), tyre shoulder accessory channels (28) which have the channel width less than the channel width of the tyre shoulder main channels (3) and extend continuously along the circumferential direction of the tyre.

Description

technical field [0001] The present invention relates to a pneumatic tire that improves handling stability on dry roads and performance on snow. Background technique [0002] Patent Document 1 below proposes a pneumatic tire in which lateral grooves and sipes are provided in a center land portion and a shoulder land portion. In the above-mentioned tire, the lateral grooves and sipes exert edge effects, thereby exhibiting superior wet performance and snow performance. [0003] However, in the tire of Patent Document 1, the axial width of the center land portion is about half of that of the shoulder land portion. Therefore, in the tire of Patent Document 1, the center land portion tends to be easily strained, and the steering stability on dry roads tends to be low. [0004] In addition, in the tire of Patent Document 1, the edge components extending along the tire circumferential direction are only the center main groove and the bezel of the shoulder main groove, so the frict...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B60C11/12B60C11/13
Inventor 平山道夫
Owner SUMITOMO RUBBER IND LTD
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