The design method of each leaf main spring of a first-order gradient stiffness leaf spring based on stiffness and stress
A stiffness and leaf spring technology, applied in the design field of each leaf main spring of a first-level gradient stiffness leaf spring, can solve the problems of inability to meet higher requirements, complicated design of the thickness and length of the main spring, and failure to provide
Inactive Publication Date: 2018-05-29
SHANDONG UNIV OF TECH
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Problems solved by technology
However, because the design of the thickness and length of each leaf of the main spring is very complicated, it is not only related to the rated load and allowable stress, but also related to the contact load and the secondary spring structure. At the same time, it is also affected by the clamping stiffness of the main spring and the calculation of the maximum stress at the root The constraints of the key issues are also related to the contact load and the auxiliary spring. Therefore, according to the information found, it has not been possible to give a design method for the main spring of each leaf spring of the first-order gradual stiffness leaf spring based on stiffness and stress. The rapid development of the vehicle industry and higher requirements for suspension springs
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Embodiment
[0038] Embodiment: the width b=63mm of a leaf spring with gradual stiffness at a certain level, and half L of the saddle bolt clamping distance 0 =50mm, elastic modulus E=200GPa, allowable stress [σ]=450MPa. Half of the span of the leaf spring is half the effective length L of the first main spring 1t =525mm, half the clamping length L of the first main spring 1 =L 1t -L 0 / 2=500mm, the number of pre-designed pieces of the main spring is n=3. Main spring clamping stiffness design value K M =75.4N / mm, design value K of clamping stiffness of primary and secondary springs MA =172.9 N / mm. Start contact load P k =1900N, rated load P N =7227N. According to the clamping stiffness of the main spring, the combined clamping stiffness of the main and auxiliary springs, half of the span of the leaf spring, width, elastic modulus, allowable stress, and initial contact load P k and rated load P N , to design the thickness and length of each main spring of the one-stage gradient s...
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The invention relates to a design method of each main spring of a first-order gradually changing stiffness leaf spring based on stiffness and stress, and belongs to the technical field of suspension leaf springs. According to the width of the main spring, the modulus of elasticity, the allowable stress, half the tightening length of the first main spring, the tightening stiffness of the main spring, the composite tightening stiffness of the main and secondary springs, the initial contact load and the rated load, the first-level gradient stiffness The thickness and length of each main spring of the leaf spring are designed. It can be seen from the test of the loading deflection and stiffness of the prototype that the design method of the main springs of the first-order gradient stiffness leaf springs based on stiffness and stress provided by the present invention is correct, and accurate and reliable calculation of the thickness and length of each main spring of the leaf springs can be obtained. value to ensure that the main spring meets the design requirements for clamping stiffness and stress strength. The method can be used to improve the design level, quality, performance, ride comfort and safety of the product; at the same time, it can reduce the cost of design and test and accelerate the speed of product development.
Description
technical field [0001] The invention relates to a vehicle suspension leaf spring, in particular to a design method for each main spring of a first-order gradual stiffness leaf spring based on stiffness and stress. Background technique [0002] In order to meet the design requirements of vehicle ride comfort under different loads, one-stage gradient stiffness leaf springs can be used. Among them, the main spring not only meets the design requirements of clamping stiffness, but also should meet the design requirements of stress intensity. Among them, the main spring The clamping stiffness of the spring affects the composite clamping stiffness of the main and auxiliary springs, the suspension bias frequency, the ride comfort and driving safety of the vehicle; the stress intensity of the main spring affects the reliability and service life of the leaf spring. The clamping stiffness and stress intensity of the main spring are determined by the number, thickness and length of the ...
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IPC IPC(8): F16F3/02F16F1/18F16F1/26G06F17/50
CPCF16F1/185F16F1/26F16F3/023F16F2230/00F16F2238/022G06F30/17G06F30/20
Inventor 周长城杨腾飞王炳超赵雷雷汪晓邵明磊王凤娟
Owner SHANDONG UNIV OF TECH