Optimal design method of variable-rigidity spiral spring

Abstract

The invention discloses an optimal design method of a variable stiffness spiral spring. The optimal design method comprises the following steps: estimating a wire diameter initial value, a pitch initial value, an inner diameter initial value and a length initial value of the spiral spring; inputting the initial wire diameter value, the initial pitch value, the initial inner diameter value and theinitial length value of the spiral spring into a simulation platform, and establishing a finite element model of the spiral spring; performing structural stress analysis on the spiral spring finite element model in the simulation platform to determine the stress level and the dangerous point position; optimizing a wire diameter parameter, a pitch parameter, an inner diameter parameter and a lengthparameter of the spiral spring finite element model; and performing a force application simulation test on the spiral spring finite element model, and determining a wire diameter optimization value,a pitch optimization value, an inner diameter optimization value and a length optimization value of the spiral spring finite element model. The designed spiral spring has the advantages of the variable rigidity, the large load, the large stroke, no maintenance and the high reliability, and the compression and extension stroke is increased on the basis of ensuring the bearing capacity.

Description

technical field [0001] The invention relates to a helical spring, in particular to an optimal design method of a variable stiffness helical spring. Background technique [0002] As the elastic element of the vehicle suspension system, the coil spring is installed between the frame and the wheel, and plays an important role in buffering and damping. Coil springs have the advantages of high energy density, low cost, maintenance-free, and high reliability. They are mainly used in passenger cars, but are rarely used in commercial vehicles, especially super-heavy vehicles. Super-heavy vehicles usually adopt a double-wishbone independent suspension system. The double-wishbone independent suspension system has the advantages of large load and large stroke, but its reliability is relatively low and maintenance is troublesome. If a super-heavy vehicle adopts a coil spring suspension system, in order to ensure the bearing capacity of the coil spring, it is necessary to make the diame...

AI Technical Summary

Problems solved by technology

For example, for a super-heavy vehicle with a single axle load of 13t, the load on the coil spring should not be less than 10t. If the wheel runout is -150~150mm, the compression and extension stroke of the coil spring should not be less than -85~85mm; The vertical and lateral layout space that heavy vehicles can provide, the vertical length of the coil spring should not be greater than 700mm, and the outer diameter of the coil spring should not be greater than 210mm. Under the constraints of these conditions, the existing coil spring cannot meet the load capacity at the same time , Compression and expansion stroke and layout space requirements

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