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Tire

A tire and bead technology, applied in tire parts, treads, transportation and packaging, etc., can solve problems such as apex deformation, and achieve the effect of restraining deformation, superior durability and restraining damage

Active Publication Date: 2016-04-27
SUMITOMO RUBBER IND LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] However, if a large load is still applied in these tires, the front end portion of the apex repeatedly undergoes large deformations

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0069] In addition to not having rubber belts and fillers, the production has figure 1 The structure of the tire shown. The size of this tire is LT265 / 75R16. The position angle α of the front end of the apex of this tire is 30° when it is assembled on a normal rim with a normal internal pressure and a load of 120% of the normal load.

Embodiment 2-4 and comparative example 2-3

[0073] Tires were obtained in the same manner as in Example 1 except that the position angle α of the front end of the apex was as shown in Table 1 below.

Embodiment 5-6

[0075] A tire was obtained in the same manner as in Example 1 except that the filler was included. Table 2 shows the ratio (Tf / Tt) of the thickness Tf of the filler to the thickness Tt of the tire when assembled on a normal rim with a normal internal pressure and a load of 120% of the normal load.

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PUM

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Abstract

The invention provides a tire. An apex of a bead has excellent durability. A regular rim (48) equipped with a tire (2) is provided with a rim (54). A buckling peripheral face (60) is formed on the rim (54), is arranged on a radial outer side edge abutted against an apex part (8) and bends with a curvature radius R. A straight line which passes a central point Pr of the curvature radius R and axially extends is set as a first datum line L1. An angle between a straight line which extends via the central point Pr and a front end (36a) of an apex (36) and the first datum line L1 is set as a position angle alpha of the front end (36a) of the apex (36). Thus, when the tire is assembled on the regular rim (48) and is provided with regular internal pressure and loaded with load of 120% of regular load, the position angle alpha is larger than 0 degree and smaller than 90 degrees.

Description

technical field [0001] The present invention relates to a tire mounted on a vehicle. Background technique [0002] The tire includes a tread, a sidewall, a bead, and the like. The bead includes a core and an apex radially extending from the core. The apex contributes to the improvement of the rigidity and durability of the tire. In conventional tires, the height of the apex is set to a certain height from the viewpoint of improving durability and rigidity. In particular, in a tire loaded with a larger load, the height of the apex is set higher. [0003] When the vehicle is running, the tires roll on the road. The contact patch of the tire moves circumferentially. The deformed position of the tire's tread, sidewall, carcass, etc. moves in the circumferential direction. Each portion such as the tread, the sidewall, and the carcass is repeatedly deformed due to the movement of the deformation position. There is a large difference in the applied load between the sidewall ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B60C15/00B60C15/06
Inventor 山本爱子山本哲也
Owner SUMITOMO RUBBER IND LTD
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