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pneumatic tire

A technology for pneumatic tires and tires, which is applied to tire parts, tire treads/tread patterns, vehicle parts, etc., and can solve the problems of large amount of tread block rubber, low durability of tread blocks, and high heat generation of tread blocks. Achieve the effect of increasing shear force, increasing shear force and promoting deformation

Active Publication Date: 2019-05-07
SUMITOMO RUBBER IND LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, since the amount of rubber in the blocks of such a tire is also large, there is a problem that the heat generated by the blocks during running is large, and the durability of the blocks is low.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0066] Based on the specifications in Table 1, prototypes with figure 1 The size of the basic pattern in the test is 225 / 95R16C pneumatic tires, and the mud road performance, durability and bending rate of each test tire are tested. The main general specifications and test methods of each test tire are as follows.

[0067]

[0068]Each test tire was mounted on all wheels of a four-wheel drive vehicle having a displacement of 3600 cc under the following conditions. Then, the test driver drives the vehicle on a muddy road test course, and evaluates the running characteristics related to the steering stability performance and the straight running stability performance at that time based on the sensory experience of the test driver. The results are shown by rating the results of Comparative Example 1 as 100. The higher the value, the better.

[0069] Rim: 6.0J

[0070] Internal pressure: 475kPa

[0071]

[0072] Using a drum-type tire testing machine, each test tire was r...

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PUM

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Abstract

The invention relates to a pneumatic tire which improves mud road performance and durability. A plurality of tire shoulder pattern blocks (6) of the pneumatic tire (1) are arranged along a circumferential direction of the tire. Each tire shoulder pattern block (6) has a side face (11) extending from a grounding end (6t) of a tire axial outer side of a tread (16) towards a tire radial inner side. In a tire meridian section containing a tire rotating shaft under a normal state, the side face (11) includes a first arc part (12) having a concave arc-shaped profile, the concave arc shape has a center in a position closer to the tire axial outer side than the ground end (6t) and the radius of curvature is 50% to 100% of a tread grounding width (TW). A tire radial distance (Ha) between the outermost end (2e) in a tire radial direction of a tread (2a) of a tread part (2) and an inner end (12i) of the tire radial direction of a first arc part (12) is 5% to 10% of a tire maximum width.

Description

technical field [0001] The present invention relates to a pneumatic tire with improved mud road performance and durability. Background technique [0002] For example, for a pneumatic tire mounted on a four-wheel drive vehicle, etc., there is an opportunity to run on roads such as muddy ground, so it is required to exhibit sufficient traction performance even on such roads (hereinafter, such performance is sometimes referred to as called "Dirt Performance".). In order to improve performance on mud roads, the tread contact width of the tread portion is increased, the groove volume of the lateral grooves formed between the blocks of the tread portion is increased, and the shearing force for mud is increased. [0003] However, since the amount of rubber in the blocks of such a tire is also large, there is a problem that the heat generated by the blocks during running is large, and the durability of the blocks is low. [0004] Patent Document 1: Japanese Patent Application Laid...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B60C11/11B60C11/04
Inventor 山本爱子
Owner SUMITOMO RUBBER IND LTD
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