JillGaskell
Release Time:
2月 23, 2024, 6:03 下午
He is an encyclopedia author specializing in the field of chemical engineering. He has in-depth research and understanding of various plastic materials, especially for polyethylene, a common and important polymer compound, which is familiar with its properties, characteristics and application range - from basic knowledge to advanced application skills can benefit people!
In 1946, the French Michelin Tire Company trial-produced the world's first radial tire. The invention of radial tires is a revolution in the tire industry and has become a new direction for the development of automobile tires.
The international code for radial tires is "R". Since its carcass structure is different from bias tires, some countries call it radial tires, X tires, etc.
The cord arrangement of the radial tire carcass is different from that of bias tires. The cords of the radial tire are not arranged to cross each other, but are close to parallel to the tire section, like the earth's meridian arrangement. The cord angle is small, usually 0°, and the carcass There is no maintenance intersection between the cords. When the tire is driving, the stress around the crown increases, which will cause circumferential stretching and radial cracks in the carcass.
Therefore, the buffer layer of the radial tire uses a nearly circumferentially arranged dealing cord layer, which intersects with the carcass cord at an angle of 90°, generally 70° to 78°, forming a rigid annular belt that can hardly stretch to fix the entire tire. , limiting the circumferential deformation of the tire. This buffer layer bears 60% to 70% of the internal stress of the entire tire and becomes the main stressed component of the radial tire, so it is called the belt layer of the radial tire.
The main stress-bearing parts of bias tires are not on the buffer layer, and 80% to 90% of the internal stress is borne by the ply of the carcass. It can be seen that the design of the radial tire belt layer is very important and must have good rigidity. Multiple layers of large-angle, high-strength and non-stretchable fiber materials can be used, such as steel wire or aramid fiber.