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Prevulcanized tread and recapped tire using the same

A technology of precured tires and vulcanized treads, which is applied to tire treads/tread patterns, tire parts, tires, etc., and can solve problems such as wet performance degradation

Inactive Publication Date: 2009-06-24
BRIDGESTONE CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, as the tread bearing surface wears, the groove depth and groove area of ​​the circumferential grooves decrease, which inevitably leads to a decrease in wet performance

Method used

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  • Prevulcanized tread and recapped tire using the same
  • Prevulcanized tread and recapped tire using the same
  • Prevulcanized tread and recapped tire using the same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0054] A precured tread having the following structure was attached to the base tire to form a retreaded tire with a tire size of 11R22.5: the precured tread was provided with three circumferential grooves and two back grooves, the circumferential grooves having a groove width of 13.0 mm, the groove width of the back groove at the bottom is 4.0 mm, and the ratio of the width of the back groove at the opening to the width of the back groove at the bottom is constant or not. Three tires were prepared for each groove width ratio. Each of the above test tires was mounted on a rim having a size of 8.25 to form a tire / rim assembly to which an air pressure (relative pressure) of 700 kPa was applied. Under the conditions of a tire load of 2500 kN and a running speed of 60 km / h, a test of a running distance of 20,000 km was performed on each tire / rim assembly on a drum testing machine. Each tire after running was visually observed to confirm the presence or absence of peeling of the p...

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PUM

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Abstract

A precured tread exhibiting excellent wet performance from the beginning to the end of wear of the tread. To achieve this, the cross sectional shape of back side grooves formed in the back side of the procured tread is appropriately set to increase the rigidity of the land part of the tread, making the tread far less possible to separate from the base tire. A retreaded tire using the precured tread is also provided. The precured tread (1) has circumferential grooves (2) formed in that front side of the procured tread that is on the ground contact surface side and extending in the tire circumferential direction and also has the back side grooves (4) formed in that back side of the procured tread that is on the side bonded to the base tire (3), extending in the tire circumferential direction, and exposed to the tread surface of the tire as the tread surface wears. The back side grooves (4) have a generally trapezoidal cross section in the lateral direction of the tire, and the width of each groove (4) is constant or gradually reduced from the bottom (5) of the groove toward its opening (6). The retreaded tire is constructed by using the precured tread.

Description

technical field [0001] The present invention relates to a precured tread having circumferential grooves extending in the circumferential direction of the tire on a front surface which will serve as a ground contact surface of the tire, and a retreaded tire using the same. The back groove attached to the back of the base tire extends in the tire's circumferential direction, and the back groove is exposed from the tread surface as the tread surface wears. In particular, the present invention aims to effectively prevent the peeling of the precured tread from the base tire without reducing the wet performance from the initial stage to the end stage of the wear life of the tire. Background technique [0002] Retreaded tires are widely known as recycled tires. Retreaded tires are formed by removing the tread or tread and a portion of the belt from a used tire to form a base tire, and then reattaching the tread made of new material to the base tire. As a method of manufacturing a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B60C11/02B60C11/00B60C11/04
CPCB60C11/04B60C11/0306B60C11/02B29D30/56
Inventor 后藤直幸久木元隆吉田刚
Owner BRIDGESTONE CORP
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