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Pneumatic tire

A technology for pneumatic tires and tires, which is applied in the direction of pneumatic tires, tire parts, tire treads/tread patterns, etc., which can solve the problems of reduced handling stability, insufficient partial wear suppression, and reduced ground contact area, and achieve improved durability. Non-uniform wear, excellent wet grip performance, and smooth changes in groove depth

Inactive Publication Date: 2013-09-25
SUMITOMO RUBBER IND LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] In addition, in the prior art, efforts have been made to secure the rigidity of the acute-angled corner d1 by chamfering e on the above-mentioned acute-angled corner d1. If the ground contact area is reduced, the handling stability will be reduced.

Method used

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  • Pneumatic tire
  • Pneumatic tire
  • Pneumatic tire

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0062] Will figure 1 Using the tread pattern shown as a reference pattern, radial tires for passenger vehicles with a tire size of 225 / 45R17 were trial-produced in accordance with the specifications shown in Table 1. Then, wet road grip performance and partial wear resistance tests were performed on each test tire, and the results were compared.

[0063] In addition, other than the specifications in Table 1, each tire has substantially the same specifications, some of which are shown below.

[0064]

[0065] ·Inclination angle α1(=αi): 20 degrees

[0066] ·Inclination angle α2: 38 degrees

[0067] ·Inclination angle α3: 55 degrees

[0068] ·Inclination angle α4(=αo): 80 degrees

[0069] (difference αo-αi): 60 degrees

[0070] Ditch depth Dy: 8.0mm

[0071]

[0072] ·Number of bars: 4

[0073]

[0074] ・First block (parallelogram shape)

[0075] ...Apex angle of acute angle side corner C1f: 20 degrees

[0076] ・Second block (parallelogram shape)

[0077] ...Ape...

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Abstract

The invention provides a pneumatic tire which can have excellent wet land gripping performance and improve operation stability and bias abrasion resistance. The pneumatic tire includes oblique axial grooves (3) which increase the inclination angle (alpha) with respect to the tire circumference facing the external side of the tire shaft while obliquely extend to the heel-side edge along the rotation direction of the tire, and blocks (6) in the shape of parallelogram divided by a plurality of circumferential connection grooves connected therebetween. Within the range closer to the axial external side of the tire than the most internal intersection positions (Pi) where the oblique axial grooves (3) intersect with the most internal circumferential connection grooves (4i) and closer to the axial internal side of the tire than the most external intersection positions (Po) where the oblique axial grooves (3) intersect with the most external circumferential connection grooves (4o), the depth (Dy) of the oblique axial grooves (3) is substantially fixed. The depth (Dg) of the at least one circumferential connection groove (4) gradually decreases from the heel-side edge (Er) to the tow-side edge (Ef).

Description

technical field [0001] The present invention relates to an oblique lateral groove extending obliquely toward the tire axially outer side and toward the rear landing side in the tire rotation direction, and a circumferential connection groove connecting the oblique lateral groove to form a plurality of parallelogram-shaped blocks on the tread portion. Pneumatic tire with directional tread. Background technique [0002] A known such as Figure 10 (A) The tire shown in (A), which is provided with an inclined lateral groove a extending obliquely from a position near the tire equator C toward the outside in the tire axial direction and toward the rear landing side in the tire rotation direction on the tread portion, and connecting the above-mentioned inclinations adjacent in the tire circumferential direction A tire that connects the groove b in the circumferential direction between the lateral grooves a and a, and has a directional pattern in which the inclination angle α of the...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B60C5/00B60C11/03B60C11/117B60C11/13
Inventor 增田贤悟
Owner SUMITOMO RUBBER IND LTD