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pneumatic tire

A technology for pneumatic tires and tires, which is applied to tire parts, tire treads/tread patterns, transportation and packaging, etc. It can solve the problems of pattern block deformation, performance on snow and dry road surface handling stability decline, etc., to improve performance on snow , Improve the effect of drainage performance

Active Publication Date: 2017-07-28
SUMITOMO RUBBER IND LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, there is a problem that the blocks tend to deform excessively due to receiving force from the road surface, and performance on snow and handling stability on dry road surfaces may be deteriorated

Method used

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Experimental program
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Embodiment approach

[0103] Manufactured including middle block, middle narrow groove and sipe and has figure 1 The basic structure and specifications of the tire shown in Table 1 are shown, and the performances are evaluated. For comparison, we also evaluated the Figure 5 Shown is a tire with a narrow central groove connected to central transverse grooves adjacent in the circumferential direction of the tire. General specifications are as follows:

[0104] Tire size: 225 / 65R17

[0105] Rim size: 17×6.5J

[0106] Tread contact width TW: 180mm

[0107] Crown main groove:

[0108] - Groove width W1a: 5.8mm, W1a / TW: 3.2%

[0109] - Angle α1a of the inclined portion: 5 degrees

[0110] - Angle α1b of the connecting portion: 50 degrees

[0111] Shoulder main groove:

[0112] - Groove width W1b: 7.2mm, W1b / TW: 4.0%

[0113] Middle lateral groove:

[0114] - Groove width W5a: 3.9mm, W5a / TW: 2.2%

[0115] - Groove depth D5a: 11.0mm, D5a / TW: 6.1%

[0116] - Angle α5a of the steep slope: 25 de...

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Abstract

A pneumatic tire configured to simultaneously achieve high levels of performance on ice, performance on snow, and driving stability performance on dry road surfaces. The pneumatic tire (1) has a tread (2) whose rotation direction (R) is specified. Crown main grooves (3) and shoulder main grooves (4) are provided in the tread (2) to thereby define intermediate land portions (5B). Each intermediate land portion (5B) is provided with intermediate transverse grooves (18) arranged spaced apart from each other to define intermediate blocks (20). Each middle block (20) is provided with: middle narrow grooves (21), inner sipes (S2) and outer sipes (S3), the middle narrow grooves (21) from the rear land portion side (20) The middle lateral groove (18) of the slack extends in the direction of rotation (R) towards the leading land portion side and terminates without reaching the middle lateral groove (18) on the leading land portion side; the inner sipes (S2) are arranged in the middle The narrow groove (21) is on the inner side in the tire axial direction; the outer sipes (S3) are arranged on the outer side in the tire axial direction. The width (W6a) of the middle narrow groove (21) and the inclination directions of the inner and outer sipes (S2, S3) are limited to a predetermined range.

Description

technical field [0001] The present invention relates to a pneumatic tire capable of achieving high levels of performance on ice, performance on snow, and handling stability on dry roads. Background technique [0002] Conventionally, there has been proposed a pneumatic tire including a tread portion with blocks provided with a plurality of sipes (see, for example, Patent Document 1 below). This pneumatic tire can improve the edge structure of the tread block and increase the frictional force reacting on the icy road surface to improve the performance on ice. [0003] Patent Document 1: Japanese Unexamined Patent Application Publication No. 2009-269500. Contents of the invention [0004] Problems solved by the present invention [0005] Unfortunately, such blocks have less stiffness due to the sipes. Therefore, there is a problem that the blocks tend to deform excessively due to receiving force from the road surface, and performance on snow and handling stability on dry r...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B60C11/12B60C11/04B60C11/11
CPCB60C11/11B60C2011/0346B60C2011/1209B60C2011/0358B60C2011/0369B60C2011/0383B60C2011/0374B60C2011/0344B60C2011/0381B60C11/12B60C11/0302B60C11/0306B60C11/0332B60C11/1236B60C2011/0334B60C2011/0341B60C2011/0376
Inventor 吉田幸志
Owner SUMITOMO RUBBER IND LTD