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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 WET performance degradation, inability to greatly improve stone discharge performance, and difficult rigidity changes, etc., to achieve Small amount of reduction, good WET performance, and the effect of reducing noise outside the vehicle

Inactive Publication Date: 2009-12-30
TOYO TIRE & RUBBER CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, it is conceivable that even if the heights are different by continuously providing concave parts and convex parts, it is still difficult to bring about a large change in rigidity, and the discharge performance of stones cannot be greatly improved.
In addition, there are still problems such as the decrease of WET performance due to the reduction of volume

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment approach

[0050] 1. The tire pattern of the pneumatic tire according to the present invention is not particularly limited as long as it has main grooves extending along the tire circumferential direction. Therefore, in the above-mentioned embodiment, the main groove provided with the protrusion extends linearly along the tire circumferential direction, and the land portion is divided into blocks and ribs. However, the main groove may also extend in a zigzag shape. , or the land part is all formed with ribs.

[0051] 2. In the above-mentioned embodiment, the example in which protrusions are provided on all the bottoms of the main grooves is disclosed, but in the present invention, the protrusions may be provided on only a part of the bottoms of the main grooves.

[0052] 3. In the above-mentioned embodiment, the example in which the outer peripheral surface of each protrusion is inclined into a tapered shape with a certain slope is disclosed, but the present invention is not limited ther...

Embodiment

[0054] Examples and the like which specifically show the configuration and effects of the present invention will be described below. In addition, the evaluation items of Examples etc. were measured as follows.

[0055] (1) Stone discharge

[0056] The atmospheric pressure is 750kPa, the rim size is 22.5×7.50, and the test tires are installed on the front wheels of the long-distance transport truck. After driving 80,000 km on the dry road, the number of stones caught in the main groove is checked.

[0057] (2) Noise

[0058] The atmospheric pressure is 700kPa, the load is 278N, and the rim size is 22.5×7.50. The tire single-body test (JASO C606-81) is carried out, and the noise level (dB(A)) at a speed of 80km / h is measured.

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Abstract

A pneumatic tire having a main groove (1) extending in a tread surface, in the circumferential direction, of the tire. Projections (10) having different heights are arranged on the bottom surface of the main groove (1) such that valleys (11) depressed inward in the radial direction of the tire and ridges (12) projecting outward in the radial direction of the tire are alternated with one another in the circumferential direction of the tire with outer peripheral surfaces (10a) of the projections (10) inclined.

Description

technical field [0001] The present invention relates to a pneumatic tire having a tread provided with main grooves extending in the tire circumferential direction, which improves the dischargeability of stones entering the main grooves. Background technique [0002] When driving on uneven gravel roads, etc., the main groove of the tire tread will clamp stones on the road, that is, stone biting occurs. In addition, when the tire rotates with such a stone-biting phenomenon, the pinched stone presses the groove bottom, or repeatedly acts to expand the main groove, causing damage such as cracks in the groove bottom. [0003] Therefore, in the past, a protrusion is provided at the bottom of the main groove to prevent stone biting. For example, in the pneumatic tires described in the following patent documents 1 and 2, a plurality of protrusions are provided on the groove bottom of the main groove, and the height of the protrusions is set higher than other parts. In addition, i...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B60C11/04B60C11/13
CPCB60C11/047B60C11/042
Inventor 梶真一
Owner TOYO TIRE & RUBBER CO LTD
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