Pneumatic radial tire for aircraft

Abstract

A pneumatic radial tire for an aircraft. The pneumatic radial tire for an aircraft comprises: a pair of bead cores that comprise a cable bead; a radial carcass that comprises a plurality of plies thatextend toroidally between the bead cores; and stiffeners that are adjacent to the bead cores on the tire-radial-direction outside of the bead cores. The radial carcass includes: at least one turn-upply that has turned-up parts that turn up around the bead cores from the tire-axial-direction inside to the outside; and at least one down ply that covers the turned-up parts and extends at least to the radial-direction inside of the bead cores. In a tire-axial-direction cross-section of the tire when the tire has been installed on a rim, is below maximum internal pressure, and is not bearing a load, when points A are the intersections between virtual circles that are centered on the centers O of the bead cores and have a radius that is twice the diameter D of the bead cores and a ply that intersects the virtual circles and is closest to the tire-axial-direction insides of the stiffeners, points B are the intersections between the virtual circles and a ply that intersects the virtual circles and is closest to the tire-axial-direction outsides of the stiffeners, and reference points C are the middle points between points A and points B, line segments OC that connect the centers O of thebead cores and reference points C have an inclination angle theta of no more than 17 degrees toward the tire-axial-direction outside relative to tire-radial-direction lines that pass through the centers O of the bead cores.

Description

technical field [0001] The present disclosure relates to a pneumatic radial tire for aircraft. Background technique [0002] Pneumatic radial tires for aircraft (hereinafter, also simply referred to as "aircraft tires" or "tyres") are used under heavy load conditions, and thus have a very high prescribed internal pressure determined according to official standards. [0003] In such an aircraft tire, shear strain generated in the rubber radially inside the bead core (bead base) is large, so the rubber forming the bead base may deteriorate or base cracks may open in the rubber. [0004] In the aircraft tire of Patent Document 1, an appropriate relationship between the thickness of the rubber of the bead base and the interference of the bead base with the rim at the center of the tire axial section of the bead core is set, thereby relieving tension in the bead base. local stress concentration, and correspondingly inhibit the cracking of the base crack. [0005] prior art lite...

AI Technical Summary

Problems solved by technology

[0003] In such tires for aircraft, the shear strain generated in the rubber on the radially inner side of the bead core (bead base) is large, so the rubber forming the bead base may deteriorate or base cracks may crack in the rubber

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