Contact Load Matching Design Method for Non-equal Deviation Frequency Gradual Stiffness Leaf Springs with Two-stage Secondary Springs

Abstract

The invention relates to a contact load matching design method for a two-stage secondary spring type non-equal bias frequency gradient stiffness leaf spring, belonging to the technical field of suspension leaf springs. According to the structural parameters of the main spring and auxiliary spring of each piece, the clamping distance of the saddle bolt, the rated load and the allowable stress, and on the premise of ensuring the stress intensity of the main spring, the invention can adjust the stiffness of the two-stage auxiliary spring with non-equal deviation frequency gradual change. The contact load of the leaf spring is optimally matched to the design. Through the prototype load deflection and stiffness and stress tests, it can be seen that the matching design method of the contact load of the two-stage auxiliary spring type non-equal deviation frequency type gradient stiffness leaf spring provided by the present invention is correct, and it is a two-stage auxiliary spring type non-equal deviation The design of the frequency-type gradient stiffness leaf spring has laid a reliable technical foundation. Using this method, a reliable design value of the contact load can be obtained, and the ride comfort of the vehicle can be improved under the premise of satisfying the stress intensity of the main spring; at the same time, the cost of product design and testing can be reduced, and the speed of product development can be accelerated.

Description

technical field [0001] The invention relates to a vehicle suspension leaf spring, in particular to a contact load matching design method for a two-stage auxiliary spring type non-equal bias frequency gradual stiffness leaf spring. Background technique [0002] In order to improve the design requirements of the ride comfort of the vehicle under the rated load, a two-stage secondary spring type gradient stiffness leaf spring can be used. The initial tangent arc height of the spring and the second-stage auxiliary spring and the two-stage gradual gap allow the auxiliary spring to bear the load in advance, thereby reducing the stress of the main spring. Among them, the contact load not only affects the stiffness characteristics of the leaf spring, the suspension bias frequency and the ride comfort of the vehicle, but also affects the stress intensity, reliability, service life and vehicle driving safety. At the same time, the matching design of the contact load is also a two-leve...

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Problems solved by technology

[0003] However, due to the constraints of the equivalent thickness of the root overlapping part and the maximum stress of the main spring root, the contact load matching design method of the two-stage secondary spring type non-equal bias frequency gradient stiffness leaf spring has not been given before, and most of them are based on experience. It is determined, therefore, that it cannot meet the rapid development of the vehicle industry and the higher requirements for suspension springs

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