Pneumatic radial tire capable of improving low-pressure high-load durability performance

Abstract

The invention provides a pneumatic radial tire capable of improving low-pressure high-load durability performance. A carcass of the tire comprises a first carcass ply layer, a second carcass ply layerand a third carcass ply layer, wherein the first carcass ply layer and the second carcass ply layer are reversely packed; the third carcass ply layer is positively packed; the height of a reverse packing end of the first carcass ply layer is (0.45-0.55) SH; the height of a reverse packing end of the second carcass ply layer is (0.35-0.45) SH; a positive packing end of the third carcass ply layeris positioned within 5mm above and below the bead toe position; and the SH is the tire section height. According to the pneumatic radial tire disclosed by the invention, the thickness of an air impervious liner is adjusted, the carcass ply structure is changed, and the size range is limited, so that the low-pressure high-load durability performance of the tire is improved.

Description

technical field [0001] The invention relates to the technical field of tires, in particular to a pneumatic radial tire for improving low-pressure and high-load endurance performance, which is suitable for light-duty heavy-duty tires and car tires. Background technique [0002] Endurance performance is an important indicator of pneumatic tires, especially for commercial trucks. Especially for tires in the domestic market, overloading and long-term driving are more serious. The current regulatory experiments can no longer meet the existing market needs, so more stringent technical requirements have been proposed, that is, low pressure, high temperature, high load durability test , The experiment time is increased from the current 34h to 71.5h (without damage). [0003] According to the research feedback, the problems in the tire durability test and actual use are mainly concentrated in the slit area. According to the finite element analysis, there are many endpoints in this a...

AI Technical Summary

Problems solved by technology

Especially for tires in the domestic market, overloading and long-term driving are more serious. The current regulatory experiments can no longer meet the existing market needs, so more stringent technical requirements have been proposed, that is, low pressure, high temperature, high load durability test , the experiment time is increased from the current 34h to 71.5h (no damage)

[0003] According to the research feedback, the problems in the tire durability test and actual use are mainly concentrated in the slit area. According to the finite element analysis, there are many endpoints in this area, such as cord, inner lining, RC\apex, reinforcing layer, white glue Wait, the stress is concentrated at the end point, so it is very easy to cause the cord and RC glue to come off

[0004] Existing technologies cannot solve the durability problem of light-duty and heavy-duty tires under low-pressure and high-load conditions. The tires will be damaged within 30 to 40 hours and cannot be used normally, affecting safety.

Images