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Automobile leaf spring (automobile leaf springs), also known as leaf spring, the northern region is commonly known as steel plate. When the steel plate spring is installed in the automobile suspension, when the vertical load is positive, each spring piece is subjected to force deformation, and has the tendency of upward camber. At this point, the axle and the frame are close to each other. When the vehicle axle and the frame are far away from each other, the forward vertical load and deformation of the leaf spring gradually decrease, sometimes even reverse.