Design method for cutting lengths of various main springs of high-strength first-level gradual-change-rigidity leaf spring

Abstract

The invention relates to a design method for cutting lengths of various main springs of a high-strength first-level gradual-change-rigidity leaf spring and belongs to the technical field of suspension steel plate springs. According to the method, according to design requirement values of structural parameters of main springs and auxiliary springs of the high-strength first-level gradual-change-rigidity leaf spring, the elastic modulus, a rated load and the remaining tangent line arc height under the rated load, on the basis of main spring initial tangent line arc height design and first-piece main spring curved surface shape calculation, the cutting lengths of the various main springs are accurately designed on the basis of the superposition principle by dividing a first-piece main spring curved surface into a plurality of micro-curved-surface units. It can be seen that from a model machine loading test, the design method for the cutting lengths of the various main springs of the high-strength first-level gradual-change-rigidity leaf spring is right. Accurate design values of the cutting lengths of the various main springs can be obtained, materials are saved, the economic benefits are improved, the production efficiency can also be improved, the design and experiment cost is reduced, and the product development speed is increased.

Description

technical field [0001] The invention relates to a vehicle suspension leaf spring, in particular to a design method for the blanking length of each main spring of a high-strength one-stage gradually changing stiffness leaf spring. Background technique [0002] With the emergence of high-strength steel plate materials, high-strength one-level gradient stiffness leaf springs can be used to meet the design requirements of vehicle ride comfort and suspension gradient bias frequency under different loads. Among them, high-strength level one The surface under the given initial tangent arc height of the gradient stiffness leaf spring is neither a circular surface nor an oblique surface, nor a parabolic surface, but a cubic surface. Therefore, according to the span size of each main spring, the main The blanking length of the spring is designed, and it is difficult to obtain the accurate design value of the blanking length by using the traditional design method, which not only affect...

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Problems solved by technology

[0002] With the emergence of high-strength steel plate materials, high-strength one-level gradient stiffness leaf springs can be used to meet the design requirements of vehicle ride comfort and suspension gradient bias frequency under different loads. Among them, high-strength level one The surface under the given initial tangent arc height of the gradient stiffness leaf spring is neither a circular surface nor an oblique surface, nor a parabolic surface, but a cubic surface. Therefore, according to the span size of each main spring, the main It is difficult to get the accurate design value of the blanking length by using the traditional design method, which not only affects the production efficiency, but also affects the utilization rate of materials and economic benefits

However, due to the complex calculation of leaf spring deflection, gradual clamping stiffness and surface shape in the gradual change process, it is also subject to key issues such as the calculation of the equivalent thickness of the overlapping part, the clamping stiffness of the main spring and the composite clamping stiffness of the main and auxiliary springs. According to the research data, it can be seen that there has been no design method for the blanking length of each piece of the main spring of the high-strength one-stage gradient stiffness leaf spring at home and abroad.

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