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pneumatic tire

A technology of pneumatic tires and tires, which is applied to tire parts, tire treads/tread patterns, vehicle components, etc., can solve problems such as difficulty in improving handling stability and reduced side grip, and achieve improved handling stability and reduced Small drainage resistance, the effect of improving wet road performance

Active Publication Date: 2019-04-16
SUMITOMO RUBBER IND LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, the longitudinal groove tends to reduce the side grip of the land portion, making it difficult to improve steering stability.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0095] Prototypes based on the specifications in Table 1 have figure 1 Four-wheel racing tires with the basic pattern shown, and the wet road grip performance, handling stability and wear resistance performance were tested. The main general specifications and test methods of each trial tire are as follows.

[0096] Tread contact width TW: 85mm (front wheel), 105mm (rear wheel)

[0097] Groove depth of main groove and inclined groove: 5.0mm

[0098] Width W4 of the second part and width W5 of the second sipe: 2% (ratio to tread contact width TW)

[0099] Angle θ2 on the tread end Te of the bent portion: 70 degrees

[0100]

[0101] Under the following conditions, each trial tire was installed on all the wheels of a four-wheel racing car with a displacement of 100cc. The test driver made the racing car run on a test track on a wet asphalt road with a water depth of 5mm, and the test driver's senses responded to it at this time. Ride characteristics related to wet road grip w...

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PUM

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Abstract

The present invention provides a pneumatic tire capable of exhibiting excellent wet performance and steering stability. In the pneumatic tire (1), the tread portion (2) is provided with an inclined groove (4) extending from the vicinity of the tire equator (C) toward the rear landing side in the rotation direction (N) toward the tread end (Te). ; And a sipe (5) connected with the inclined groove (4) and extending along the tire axial direction. The inclined groove (4) includes a straight portion (6) having an angle of 10 to 30° with respect to the tire circumferential direction, and a curved portion extending toward the tread end (Te) while gradually increasing the angle with respect to the tire circumferential direction. (7). The sipe (5) includes: a first sipe (11) that communicates the straight portions (6, 6) of adjacent oblique grooves (4) in the tire circumferential direction; and an oblique groove (4) that is adjacent in the tire circumferential direction. ), a second sipe (12) in which the straight portion (6) and the curved portion (7) communicate.

Description

technical field [0001] The present invention relates to a pneumatic tire capable of exhibiting excellent wet performance and steering stability. Background technique [0002] Pneumatic tires are known in which a plurality of inclined grooves extending from the tire equator toward the rear landing side in the direction of rotation and toward the tread end, and a plurality of longitudinal grooves communicating between the inclined grooves are provided on the tread portion. In such a pneumatic tire, the inclined grooves and the longitudinal grooves can discharge the water film under the land portion to the outside of the tread edge by rolling of the tire, thereby improving the wet road performance. [0003] However, the longitudinal groove tends to lower the side grip of the land portion, making it difficult to improve steering stability. [0004] Patent Document 1: Japanese Patent Laid-Open No. 2011-189846 Contents of the invention [0005] The present invention has been m...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B60C11/04B60C11/117B60C11/12
CPCB60C11/0302B60C11/032B60C11/04B60C11/1204B60C2011/1209B60C2011/0388
Inventor 藤田将之
Owner SUMITOMO RUBBER IND LTD
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