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Tubular tires for heavy duty

A technology for heavy loads and tires, which is applied in the direction of tire parts, bead, and rolling resistance optimization, etc., which can solve the problems of reduced durability of the bead portion, achieve the effects of suppressing deformation, reducing strain, and improving durability

Active Publication Date: 2019-02-12
SUMITOMO RUBBER IND LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, when only the technology described in the above-mentioned Patent Document 1 is applied to a heavy-duty tube tire, the durability of the bead portion may decrease.

Method used

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  • Tubular tires for heavy duty
  • Tubular tires for heavy duty
  • Tubular tires for heavy duty

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0058] Trial-manufactured according to the specifications in Table 1 with figure 2 A heavy-duty tube tire of the basic construction and size 10.00R20 was used, and the rolling resistance performance as well as the bead durability performance were tested. In heavy-duty inner tube tires of various specifications, common rubber is used for the first bead apex and the second bead apex. The hardness of the first bead apex is 85 degrees, and the hardness of the second bead apex is 85 degrees. The hardness is 55 degrees. The test method is as follows.

[0059]

[0060] Each test tire was mounted on a 7.50×20 rim, and the rolling resistance was measured using a rolling resistance testing machine under the conditions of an internal pressure of 790 kPa, a load of 25.01 kN, and a speed of 80 km / h. The results are represented by an index with a value of 100 for the comparative example. The smaller the numerical value, the smaller the rolling resistance, that is, the better the evalu...

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PUM

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Abstract

The invention provides a heavy-load tire having an inner tube and capable of reducing rolling resistance without damaging durability. The heavy-load tire (1) having the inner tube is equipped with a carcass (6) and a bead apex (8). In a non-loaded normal state, the tire radial outer end (5o) of a bead core (5) is located at a position closer to the tire radial inner side than the tire radial outer end (Fo) of a flange (F) of a normal rim. The bead apex (8) is provided with a first bead apex (8a) disposed on the tire axial inner side, and a second bead apex (8b) which is disposed at a position closer to the tire axial outer side than the first bead apex (8a) and which made of rubber having small rubber hardness and small loss tangent (tan[deta]). The tire axial thickness (T1o) of a region (So), closer to the tire radial outer side than the outer end (Fo), of the first bead apex (8a) is less than the tire axial thickness (T2o) of the second bead apex (8b).

Description

technical field [0001] The present invention relates to a heavy duty inner tube tire capable of reducing rolling resistance without impairing durability. Background technique [0002] Conventionally, in heavy-duty tires, both superior durability performance and reduction in rolling resistance have been desired. [0003] For example, Patent Document 1 below discloses a heavy-duty tubeless tire composed of two types of rubber: a first bead apex rubber axially inside and a second bead apex rubber axially outside. The bead apex extends conically from the bead core between the main body portion of the carcass and the turnback portion, so that the loss tangent tanδ of the second bead apex is smaller than the loss tangent tanδ of the first bead apex, thereby achieving Reduced rolling resistance. [0004] Patent Document 1: Japanese Patent Laid-Open No. 2002-178724 [0005] Various proposals have been made for reducing rolling resistance in heavy-duty tube tires. For example, it...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B60C15/00
CPCY02T10/86
Inventor 田中聪
Owner SUMITOMO RUBBER IND LTD