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pneumatic tire

A technology for pneumatic tires and tires, applied in tire parts, tire treads/tread patterns, vehicle parts, etc., to achieve excellent noise performance, maintain handling stability, and suppress excessive deformation.

Active Publication Date: 2019-05-14
SUMITOMO RUBBER IND LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, in Patent Document 1, there is room for further improvement in the reduction of the air column resonance sound generated in the main groove and the steering stability.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0074] Prototyped according to the specifications in Table 1 with figure 1 The basic tread pattern and has image 3 (a) A pneumatic tire in which the first inner middle lateral sipe size is 185 / 60R15. As a comparative example, a trial production with figure 1 A pneumatic tire in which the entire area of ​​the sipe is formed at the same depth as the middle vertical sipe for all the inner middle horizontal sipe. The noise performance and wet performance of each test tire were tested. Common specifications and test methods for each test tire are as follows.

[0075] Rim: 15×5.0J

[0076] Tire internal pressure: 230kPa

[0077] Test vehicle: Displacement 1300cc, front-wheel drive

[0078] Test tire installation position: all wheels

[0079]

[0080] The noise inside the vehicle was measured when the test vehicle was driven at a speed of 60 km / h on a dry asphalt road. In-vehicle noise was measured using a microphone located on the head of the driver's seat. The results a...

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Abstract

The present invention provides a pneumatic tire capable of exhibiting excellent noise performance while maintaining steering stability. This pneumatic tire is provided with shoulder main grooves (5) and center main grooves (6) on a tread portion (2), thereby defining a middle land portion (7). A middle vertical sipe (10) and a plurality of middle horizontal sipes (11) are provided on the middle land portion (7). The middle horizontal sipes (11) include a plurality of inner middle horizontal sipes (12), one end of which communicates with the central main groove (6), and the other end is closer to the central main groove than the middle longitudinal sipe (10). The position on the side of the groove (6) forms the terminal. The inner middle lateral sipe (12) includes a first inner middle lateral sipe (15) at least in part having a deeper depth than the middle longitudinal sipe (10).

Description

technical field [0001] The present invention relates to a pneumatic tire capable of exhibiting excellent noise performance while maintaining steering stability. Background technique [0002] For example, Patent Document 1 below proposes a pneumatic tire in which narrow grooves extending continuously in the tire circumferential direction are provided on land portions divided by main grooves in order to achieve both wet performance and noise performance. In this pneumatic tire, the groove width and groove depth of the narrow grooves are specified within a certain range. [0003] However, in Patent Document 1, there is room for further improvement in reduction of air column resonance sound generated in the main groove and steering stability. [0004] Patent Document 1: Japanese Patent Application Laid-Open No. 05-319027 Contents of the invention [0005] The present invention has been made in view of the above problems, and its main purpose is to provide a vehicle that can ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B60C11/12
CPCB60C11/1236
Inventor 竹内光章
Owner SUMITOMO RUBBER IND LTD