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Pneumatic tire

A technology of pneumatic tires and tire radius, which is applied to tire parts, tire tread/tread pattern, transportation and packaging, etc., and can solve problems such as increased ground pressure on the tread and tread, defects or cracks in the main groove rubber, etc. To achieve the effect of preventing wet road, preventing the reduction of ditch volume and good stone inclusion

Active Publication Date: 2008-12-03
SUMITOMO RUBBER IND LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In addition, when the pneumatic tire is driven in a state where such stone inclusions are generated, there is a risk of rubber chipping, cracks, etc. occurring in the main groove.
In addition, such stone inclusions tend to increase the ground contact pressure of the tread and are particularly likely to occur in pneumatic tires for trucks with deep grooves.

Method used

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Examples

Experimental program
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Effect test

Embodiment

[0065] Based on the specifications in Table 1, radial tires for trucks with a size of 11R22.5 were tested, and their performance was tested. In addition, in Comparative Examples 1 and 2, the groove wall surface was constituted by a single plane. The test method is as follows.

[0066] Anti-stone performance:

[0067] The above-mentioned tires were mounted on the front wheels of the vehicle under the following conditions, and after driving for about 2 hours on a road surface including a gravel road, the number of stones caught in the main groove of the front wheels was investigated. The results are represented by an index in which the number of stones in Example 1 is 100. The lower the value, the better.

[0068] Rims: 7.50×22.5

[0069] Internal pressure: 800kPa

[0070] Vehicle: 10 ton load 2-DD vehicle (without load)

[0071] Wet performance:

[0072] On an asphalt road with a water depth of 5 mm, the vehicle was fully braked from a speed of 60 km with ABS turned on, ...

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Abstract

The invention provides a pneumatic tire which can reduce dunn bass of a main channel, the pneumatic tire is provided with at a tire surface section: a central main channel (3) and a tire shoulder main channel (4). For the central main channel (3) and the tire shoulder main channel (4), a channel wall surface (10) in a channel section which is at a right angle to the length direction of the channel comprises; a base (10b) which extends from channel bottom (B) to one side vertical to a tire tread (2a) or in a direction of enlarging width of the channel; and a gentle slope section (10a) which extends from an upper end of the base (10b) to the tire tread (2a) in such a manner of being more gentle than the base (10b). The height (Hc1) in tire radius direction of the gentle slope section (10a) of the central main channel (3) is larger than the height (Hs1) in tire radius direction of the gentle slope section (10a) of the tire shoulder main channel (4), and projections (11), which are used for prevention of dunn bass, are provided at the channel bottom (B) of the central main channel (3) and at a position away from the channel wall surface (10) at interval in the length direction of the tire.

Description

technical field [0001] The present invention relates to a pneumatic tire capable of effectively reducing stone inclusions into a main groove provided in a tread portion. Background technique [0002] In order to ensure drainage, the tread portion of the pneumatic tire is provided with one or more relatively wide main grooves extending in the tire circumferential direction. When such a pneumatic tire is used to drive on a construction site or on a road surface covered with gravel, so-called stone trapping, in which small stones are caught in the main groove and remain intact, tends to occur. Furthermore, when the pneumatic tire is driven in a state where such stone inclusions are generated, there is a risk of rubber chips, cracks, and the like occurring in the main groove. In addition, such stone inclusions tend to increase the ground contact pressure of the tread, and are particularly likely to occur in pneumatic tires for trucks having a large groove depth. [0003] In th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B60C11/03B60C11/13
CPCB60C11/047
Inventor 伊藤邦明
Owner SUMITOMO RUBBER IND LTD
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