Design method of gap between few leaf taper main spring in parabolic segment and auxiliary spring

A design method and parabolic technology, applied in the field of vehicle suspension leaf springs, can solve problems such as inability to provide analytical design formulas, complex deformation calculations, and inability to meet the design requirements of small-piece variable-section leaf springs, etc.

Active Publication Date: 2016-08-03
WM MOTOR TECH GRP CO LTD
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Problems solved by technology

However, since the calculation of the deformation at any position of the non-isomorphic few-piece variable-section leaf spring at any position is very complicated, it has not been possible to give the parabolic and secondary Design method of primary and secondary spring gap at spring contact point
[0003] Although someone has previously given a design method for a few variable-section leaf springs, for example, Peng Mo and Gao Jun once proposed the design of variable-section leaf springs in "Automotive Engineering", 1992 (Volume 14) No. 3 Calculation method, this method is mainly designed for the small-piece parabolic variable-section leaf spring with the end isomorphic. Design of the gap between the main sprin

Method used

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  • Design method of gap between few leaf taper main spring in parabolic segment and auxiliary spring
  • Design method of gap between few leaf taper main spring in parabolic segment and auxiliary spring
  • Design method of gap between few leaf taper main spring in parabolic segment and auxiliary spring

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Embodiment 1

[0033] Embodiment 1: The sheet number N=2 of a few sheet parabolic variable-section main springs, wherein, the half length L=575mm of each sheet main spring, the width b=60mm, the modulus of elasticity E=200GPa, the straight section of the root Thickness h 2 =11mm, half of the installation distance l 3 =55mm, the distance l from the root of the parabola segment to the end point of the main spring 2 =L-l 3 = 520mm, the thickness h of the end straight section of the first main spring 11 =7mm, that is, the thickness ratio β of the parabolic segment of the first main spring 1 =0.64, the thickness h of the straight section at the end of the second main spring12 =6mm, that is, the thickness ratio β of the parabolic segment of the second main spring 2 =0.55; half length L of secondary spring A =365mm, that is, the horizontal distance l from the end point of the auxiliary spring to the end point of the main spring 0 =L-L A =210mm, when the load is greater than the active load o...

Embodiment 2

[0053] Embodiment two: the sheet number N=2 of a few sheet parabolic variable section main spring, wherein, the half length L=600mm of each sheet main spring, width b=60mm, modulus of elasticity E=200GPa, root thickness h 2 =14mm, half of the installation distance l 3 =60mm, the distance from the root of the parabola segment to the end point of the main spring l 2 =L-l 3 =540mm; Thickness h of the straight section at the end of the first main spring 11 =9mm, that is, the thickness ratio β of the parabolic segment of the first main spring 1 =0.64, the thickness h of the straight section at the end of the second main spring 12 = 8mm, that is, the thickness ratio β of the parabolic segment of the second main spring 2 =0.57; half length L of secondary spring A =380mm, that is, the distance l from the end point of the secondary spring to the end point of the main spring 0 =L-L A =220mm; half of the required load of the secondary spring is the single-end point load P=3000N, w...

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Abstract

The invention relates to a design method of a gap between few leaf taper main spring in a parabolic segment and an auxiliary spring, and belongs to the technical field of suspension steel plate springs. According to the method, the endpoint deformation coefficient Gx-Di of each main spring and the deformation coefficient Gx-BC in a contact point between a main spring N and the auxiliary spring can be determined firstly according to the structure size and elasticity modulus of a non-isosteric parabola tapered section main spring at the end part of each leaf; the endpoint force of the main spring N is obtained according to the active load of the auxiliary spring and the Gx-Di of each main spring; then the gap between the main spring in the parabolic segment and the auxiliary spring at the contact point is designed according to the thickness h2 of the root of the main spring N, an FN and the Gx-BC. Simulation verification shows that an accurate design value of the gap between the main spring and the auxiliary spring can be obtained through the method, the design requirement of the active load of the auxiliary spring is met, and the design level and performance of a product and vehicle riding comfort are improved; meanwhile, the development speed of the product is improved, and design and testing costs are reduced.

Description

technical field [0001] The invention relates to a vehicle suspension leaf spring, in particular to a design method for the clearance between a main spring with a small number of variable cross-sections in a parabolic segment and an auxiliary spring. Background technique [0002] In order to meet the variable stiffness design requirements of the vehicle suspension under different loads, a small number of variable-section leaf springs are usually designed as the main spring and the auxiliary spring. Among them, the main spring is designed with a certain gap at the contact point with the auxiliary spring to ensure After a certain load is exceeded, the main and auxiliary springs are in contact and work together. Since the first piece of the main spring with variable cross-section is subjected to complex forces, it not only bears vertical loads, but also bears torsional loads and longitudinal loads. Therefore, the end thickness of the first leaf spring actually designed is usuall...

Claims

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Application Information

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IPC IPC(8): G06F17/50
CPCG06F30/15G06F30/23
Inventor 周长城王炳超于曰伟王凤娟邵明磊赵雷雷张云山
Owner WM MOTOR TECH GRP CO LTD
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