Composite material plate spring of 3 +1 structure

The utility model discloses a composite material plate spring with a 3 + 1 structure, which belongs to the technical field of automobile parts, and has the technical scheme that the composite material plate spring comprises three main springs and an auxiliary spring which are stacked together from bottom to top, two ends of the main spring positioned on the uppermost layer are wound into a ring, and a lining is arranged in the ring; the main spring is made of 51CrV4 spring steel, and the auxiliary spring is made of glass fiber. A main spring gasket is cushioned in the middle of the bottom side of the main spring located on the lowermost layer, and inter-main-spring-piece gaskets are cushioned between the main spring gasket and the main springs and between the middles of the main springs; auxiliary spring gaskets are padded on two sides of the middle part of the auxiliary spring; and flexible gaskets are padded between the auxiliary spring gaskets and the auxiliary spring. According to the plate spring, the we