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pneumatic tire

A technology for pneumatic tires and tires, which is applied to the reinforcement layers, tire parts, tire edges and other directions of pneumatic tires, and can solve problems such as reducing the durability of the bead portion.

Active Publication Date: 2020-09-22
TOYO TIRE & RUBBER CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

By providing reinforcement around the turn-up portion of the carcass ply with a cord reinforcement layer, the strain at the turn-up end of the carcass ply can be dispersed. Ratio is very high, so the stress and strain concentrate on the end of the cord reinforcement layer, and the durability of the bead part tends to decrease

Method used

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Embodiment Construction

[0021] Embodiments of the present invention will be described below with reference to the drawings. figure 1 It is a tire meridian cross-sectional view showing an example of a pneumatic tire (hereinafter referred to as "tire") 10 according to the first embodiment, and shows a half cross-section in a state of being mounted on a rim flange 1 of a predetermined rim.

[0022] In this specification, the tire width direction is a direction parallel to the tire rotation axis, meaning the same as the tire axial direction, which is represented by reference symbol Y in the figure, and the tire width direction inner side is respectively represented by reference symbols Y1 and Y2 and outside. In addition, the tire radial direction (the meridian direction) is a direction perpendicular to the tire rotation axis, and is indicated by reference sign Z in the drawings, and the tire radial inner side and outer side are indicated by reference signs Z1 and Z2, respectively. The tire meridian dire...

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Abstract

Technical Problem: To provide a pneumatic tire capable of avoiding a local increase in tire rigidity and improving the durability of a bead portion. Solution: A pneumatic tire (10) includes a first carcass ply (20A) and a second carcass ply (20B) disposed on the outer surface side of the first carcass ply (20A). The first carcass ply (20A) and the second carcass ply (20B) are provided in the roll-up portion (22A, 22B) with the ply cords (23A, 23B) inclined along the meridian direction (MD) Inclined regions (Q1, Q2) arranged in the directions, and meridional regions (P1, P2) in which the ply cords are arranged in the radial direction outside the inclined regions (Q1, Q2) in the direction of the meridian, so that in side view The second inclined area (Q2) overlaps the first inclined area (Q1) in such a manner that the lower second ply cords (23B) intersect the first ply cords (23A). The boundary (S1) of the first inclined area (Q1) and the first meridian area (P1) and the boundary (S2) of the second inclined area (Q2) and the second meridian area (P2) are located more than the bead core (13) The front end (13A) is further inward in the tire radial direction (Z1).

Description

technical field [0001] The present invention relates to a pneumatic tire. Background technique [0002] In a pneumatic radial tire, a cord reinforcement layer including a nylon cord, a steel cord, or the like is sometimes provided along the turn-up portion of the carcass ply in order to improve the durability of the bead portion. By providing reinforcement around the turn-up portion of the carcass ply with a cord reinforcing layer, the strain at the turn-up end of the carcass ply can be dispersed. Since the ratio is very high, the stress and strain concentrate on the ends of the cord reinforcing layer and the durability of the bead portion tends to decrease. [0003] Therefore, in the following Patent Document 1, a pneumatic tire is proposed, which adopts a laminated ply structure in which two or more carcass plies are formed at the bead portion position, and the ply cords are connected to each other at the position of the laminated ply structure. The carcass plies are lam...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B60C9/02B60C15/00
CPCB60C9/02B60C15/00
Inventor 小嶋邦弘
Owner TOYO TIRE & RUBBER CO LTD