How to combine lightweight and high strength in new energy vehicle chassis? New energy vehicle chassis lightweight and high strength is the key to achieve vehicle performance improvement and energy saving and emission reduction, need to be optimised from the material selection, structural design, manufacturing process of the three aspects of synergy.
By adjusting the alloy composition and heat treatment process, the yield strength and tensile strength of high-strength steel has increased significantly, in the same strength requirements, can reduce the amount of material to achieve lightweight. The yield strength of some high-strength steel can reach more than 600MPa, which is used for the key structural parts of the chassis, and can reduce the weight while ensuring the strength.
Carbon fibre composites have extremely high specific strength and specific modulus, extremely light weight and high strength. They are commonly used in key parts of chassis of high-end new energy vehicles, such as some structural parts of racing car chassis. The high cost of carbon fibre composites limits their large-scale application.
Some of the solid structural parts of the chassis are designed as hollow structures, which can reduce the amount of material used while ensuring the strength. The drive shafts of some new energy vehicles adopt hollow design, which not only reduces the weight, but also lowers the rotational inertia and improves the transmission efficiency.
For high-strength steel, the use of hot forming process can further improve its strength and forming properties. The steel plate is formed at high temperatures and then cooled quickly to give it a very high strength. Chassis components made by the hot forming process can ensure strength while reducing wall thickness to achieve lightweight.
How can a new energy vehicle chassis balance lightweight and high strength? Advanced connection technologies, such as laser welding and riveting, are used to improve the connection strength between parts and reduce the use of connectors, thus reducing the weight of the chassis.
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