3x] stands for the thickness of the auxiliary spring at the point with a distance of x to the parabola vertex (end point of the main spring), = [h.
If a clip exists at the end of the auxiliary spring to transmit the lateral load or a rubber block to cushion stiffness mutation, the end thickness of the auxiliary spring is minimized as long as it satisfies certain needs of the lateral load and bearing reliability of the rubber block.
1) An equation for calculating the composite stiffness for multileaf springs when the main and auxiliary spring are under full contact is derived.
3]: Length of the parabolic portion of the auxiliary spring (subscripts f and r indicate the front half or rear half of the spring) (see [l.
6]: Front end thickness, root thickness, and rear end thickness of the auxiliary spring
3x]: Thickness functions of the cross section in the parabolic portion of the first main spring, second main spring, and auxiliary spring
In , the main and auxiliary springs are modeled as multileaf cantilever beams, and an efficient method for calculating the nonlinear stiffness of a progressive multileaf spring is developed and evaluated.