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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., to achieve the effect of increasing the ground contact area, high handling stability, and increasing groove volume

Inactive Publication Date: 2013-09-18
SUMITOMO RUBBER IND LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003]However, if the land ratio is set higher, there is a problem of causing a decrease in wet performance
In this way, grip on dry roads and wet road performance are contradictory things, so it is very difficult to balance the two

Method used

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  • Pneumatic tire
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Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0059] based on Figure 8 and the specifications of Table 1 formed with figure 1 The tread pattern indicated is a pneumatic tire with a basic pattern of tire size 245 / 40R18, and the off-road time and appearance wear of each test tire on the obstacle course route were tested and compared. The shoulder lateral grooves of Comparative Examples 1 and 2 and Examples 1 to 5 are: Figure 8 The cross-sectional shape indicated by the solid line in . In addition, only the radius of curvature of the chamfered portion was changed while the groove wall surface of Comparative Example 1 was fixed (thereby, the groove widths of Comparative Example 2 and Examples 1 to 5 were also changed). The specifications of Comparative Example 1 are as follows.

[0060] Tread ground width TW: 240mm

[0061] Groove width W1 of crown groove: 12mm

[0062] Groove depth D1 of crown groove: 5.5mm

[0063] Angle θ1 of the main portion of the crown groove: 20 to 50 degrees

[0064] Angle θ2 of the sub-port...

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Abstract

The invention relates to a pneumatic tire, capable of increasing the road behavior on the dry road during the corner running without reducing the performance of the wet road. A plurality of grooves are arranged on the tire surface of the pneumatic tire and the groove comprises a tire shoulder cross groove (6) and the distant between the axial inner end of the tire of the tire shoulder cross groove (6) and the tire equator is 10-20% of the tire contact width and the axial outer end of the tire goes across the ground end to extend outside. The axial outer end of the tire gets across the ground end to extend towards the outer side. In the cross section perpendicular with the long edge direction of the tire shoulder cross groove (6), the groove wall surface (6b) of the tire shoulder cross groove comprises: a base part (10) extending from the groove bottom (6a) towards the tire surface thread surface side; a chamfer surface (11) extending in the arc shape between the radial outer end of the tire (10e) and the tire surface thread surface to be connected. The curvature radius (R1) of the chamfer surface (11) is 4.0-10.0mm.

Description

technical field [0001] The present invention relates to a pneumatic tire capable of improving grip when cornering on a dry road without deteriorating wet road performance by improving the cross-sectional shape of an edge portion of a shoulder lateral groove provided on a tread portion. Background technique [0002] Pneumatic tires manufactured for steeplechase or circuit driving are required to have handling stability at high speeds compared with general pneumatic tires for passenger cars. In particular, in the obstacle course, since there are many curves on the driving road, special attention is paid to the grip when turning. In order to improve the grip performance when cornering, it is sufficient to increase the land ratio by reducing the volume of the grooves formed in the tread portion of the pneumatic tire. [0003] However, if the land ratio is set high, there is a problem of causing a decrease in wet performance. In this way, grip on dry roads and wet road perform...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B60C11/117
CPCB60C11/1315B60C2011/0358
Inventor 谷川利晴
Owner SUMITOMO RUBBER IND LTD