CN108223651A - The non-design method that structures is waited to lack the free tangent line camber of piece changeable section plate spring in end - Google Patents

The non-design method that structures is waited to lack the free tangent line camber of piece changeable section plate spring in end Download PDF

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CN108223651A
CN108223651A CN201810051232.8A CN201810051232A CN108223651A CN 108223651 A CN108223651 A CN 108223651A CN 201810051232 A CN201810051232 A CN 201810051232A CN 108223651 A CN108223651 A CN 108223651A
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leaf spring
structures
piece
waited
section plate
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周长城
王凤娟
赵雷雷
汪晓
杨腾飞
杨铖兆
张云山
朱召辉
石莹
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Shandong University of Technology
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Shandong University of Technology
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
    • F16F3/00—Spring units consisting of several springs, e.g. for obtaining a desired spring characteristic
    • F16F3/02—Spring units consisting of several springs, e.g. for obtaining a desired spring characteristic with springs made of steel or of other material having low internal friction
    • F16F3/023—Spring units consisting of several springs, e.g. for obtaining a desired spring characteristic with springs made of steel or of other material having low internal friction composed only of leaf springs
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
    • F16F1/00—Springs
    • F16F1/02—Springs made of steel or other material having low internal friction; Wound, torsion, leaf, cup, ring or the like springs, the material of the spring not being relevant
    • F16F1/18—Leaf springs
    • F16F1/185—Leaf springs characterised by shape or design of individual leaves
    • F16F1/187—Leaf springs characterised by shape or design of individual leaves shaped into an open profile, i.e. C- or U-shaped
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F30/00—Computer-aided design [CAD]
    • G06F30/10—Geometric CAD
    • G06F30/15—Vehicle, aircraft or watercraft design
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F30/00—Computer-aided design [CAD]
    • G06F30/10—Geometric CAD
    • G06F30/17—Mechanical parametric or variational design
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F30/00—Computer-aided design [CAD]
    • G06F30/20—Design optimisation, verification or simulation
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
    • F16F2226/00—Manufacturing; Treatments
    • F16F2226/04—Assembly or fixing methods; methods to form or fashion parts
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
    • F16F2228/00—Functional characteristics, e.g. variability, frequency-dependence
    • F16F2228/06—Stiffness
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
    • F16F2230/00—Purpose; Design features
    • F16F2230/0082—Dimensional tolerances, e.g. play between mechanical elements
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
    • F16F2230/00—Purpose; Design features
    • F16F2230/40—Multi-layer
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
    • F16F2238/00—Type of springs or dampers
    • F16F2238/02—Springs
    • F16F2238/022—Springs leaf-like, e.g. of thin, planar-like metal
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F2119/00—Details relating to the type or aim of the analysis or the optimisation
    • G06F2119/06—Power analysis or power optimisation

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  • Physics & Mathematics (AREA)
  • General Engineering & Computer Science (AREA)
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  • Theoretical Computer Science (AREA)
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  • Computer Hardware Design (AREA)
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  • Automation & Control Theory (AREA)
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Abstract

The present invention relates to the non-design methods that structures is waited to lack the free tangent line camber of piece changeable section plate spring in end, belong to suspension and lack piece changeable section plate spring technical field.The present invention can be according to leaf spring the piece number, the structural parameters of each leaf spring, elasticity modulus, root and the thickness of end pad, and the design requirement value of the next first leaf spring initial tangential camber of mounting clip and each pre- clamping stress of leaf spring, the free tangent line camber of each leaf spring that structures formula is waited to lack piece parabolic type changeable section plate spring non-to end are designed.By prototype test it is found that the non-design method that structures is waited to lack the free tangent line camber of piece changeable section plate spring in end provided by the present invention is correct, reliable technical method is provided for the free tangent line camber design of each leaf spring.It can ensure that first leaf spring initial tangential camber and each pre- clamping stress of leaf spring meet design requirement using this method, improve horizontal product design, reliability and service life and vehicle safety；Design and testing expenses are reduced simultaneously, accelerate product development speed.

Description

The non-design method that structures is waited to lack the free tangent line camber of piece changeable section plate spring in end
Technical field
Lack that piece changeable section plate spring, particularly end are non-to wait structures to lack piece changeable section plate spring and freely cut the present invention relates to vehicle suspension The high design method of bank.
Background technology
With the implementation of vehicle energy saving and lightweight policy, few piece changeable section plate spring is because with light-weight, stock utilization Height, is increasingly subject to vehicle suspension expert, production enterprise at small without rubbing or rubbing between piece, the advantages that vibration noise is low, and service life is long Industry and the highest attention of vehicle manufacture enterprise, wherein, what is be most widely used is few piece parabolic type changeable section plate spring.Due to head The end stress of piece leaf spring is complicated, therefore, the thickness and length of the end flat segments of usual first leaf spring, more than other each sheets The thickness and length of the end flat segments of spring, i.e. end are non-to wait structures to lack piece parabolic type changeable section plate spring.In order to meet bridle Tight stiffness characteristics, the design requirement for improving leaf spring reliability and service life usually pass through the free tangent line of difference of each leaf spring Camber and free radius of curvature meet the design requirement of first leaf spring initial tangential camber after assembling clamps；Meanwhile make head Piece leaf spring or former leaf springs generate certain pre- clamping compression, so as to improve leaf spring reliability and service life.Each sheet The size of the free tangent line camber of spring decides the initial tangential camber of first next leaf spring of mounting clip, and influences each leaf spring The size of pre- clamping stress, however, according to consult reference materials it is found that do not provided always inside and outside predecessor State reliable end it is non-wait structures it is few The design method of the free tangent line camber of piece changeable section plate spring, it is impossible to meet vehicle fast development and piece changeable section plate spring is lacked to suspension Modernize the requirement of CAD design.It is non-to end to wait structures few with Vehicle Speed and its continuous improvement to ride comfort requirement Piece parabolic type changeable section plate spring proposes higher requirement, therefore, it is necessary to which it is few to establish the structures such as one kind is accurate, reliable end is non- The design method of the free tangent line camber of piece changeable section plate spring, which is that end is non-, waits structures to lack freely cutting for piece parabolic type changeable section plate spring The design of bank height provides reliable technical method, meet fast-developing Vehicle Industry, vehicle ride performance and safety and its To the design requirement of few piece changeable section plate spring, design level, reliability and the service life and vehicle driving safety of product are improved Property；Meanwhile the design and testing expenses of product are reduced, accelerate product development speed.
Invention content
Defect present in for the above-mentioned prior art, the technical problems to be solved by the invention be to provide it is a kind of it is easy, The non-design method that structures is waited to lack the free tangent line camber of piece changeable section plate spring in reliable end, design flow diagram, as shown in Figure 1. End is non-to wait structures formula to lack piece parabolic type changeable section plate spring for center mounting hole symmetrical structure, symmetrical center line is seen as The root fixing end of half leaf spring sees end stress point as leaf spring endpoint, one hemihedrism clamping structure schematic diagram such as Fig. 2 It is shown, including, leaf spring 1, root shim 2, end pad 3.One half-span of leaf spring 1 be by root flat segments, parabolic segment and Three sections of end flat segments are formed, and root flat segments clamp for U-bolts assembling.Leaf spring the piece number is n, wherein, 2≤n≤5； One half-span of each leaf spring is LT, the half length L of root flat segments0, width b, elasticity modulus E；The root of each leaf spring The thickness h of portion's flat segments2, the thickness h of the end flat segments of each leaf springi, the thickness ratio of parabolic segment is βi=h1i/h2.End The length of flat segments isRoot shim 2 is equipped between the root of each leaf spring, root shim thickness is δc.Respectively End pad 3 is equipped between the end of piece leaf spring, the thickness of end pad is δe, the material of end pad is carbon fiber composite Material, to reduce frictional noise caused by leaf spring work.Pass through the free tangent line camber H of respective difference of each leaf springgi0, it is ensured that The initial tangential camber H of first leaf spring after the pre- clamping of assemblinggC1With the pre- clamping stress σ of each leaf springiMeet design requirement, i =1,2 ..., n.According to leaf spring the piece number, the structural parameters of each leaf spring, elasticity modulus, the thickness of root shim and end pad, And the design requirement value of the next first leaf spring initial tangential camber of mounting clip and each pre- clamping stress of leaf spring, reciprocity structure formula are few The free tangent line camber of each leaf spring of piece parabolic type changeable section plate spring is designed.
Structures is waited to lack the free tangent line camber of piece changeable section plate spring in order to solve the above technical problems, end provided by the present invention is non- Design method, it is characterised in that use following design procedure：
(1) the non-each leaf spring that structures is waited to lack piece parabolic type changeable section plate spring in end clamps stiffness KiCalculating
Step A：The pinching end point deformation coefficient G of each leaf springx-DiCalculating
According to leaf spring the piece number n, the width b of leaf spring, half span LT, the half length L of root flat segments0, elastic modulus E, The thickness h of the root flat segments of each leaf spring2, the thickness h of end flat segments1i, the thickness ratio β of parabolic segmenti=h1i/h2, i= 1,2 ..., n, the pinching end point deformation coefficient G of each leaf spring that structures is waited to lack piece parabolic type changeable section plate spring non-to endx-DiInto Row calculates, i.e.,
Step B：The clamping stiffness K of each leaf springiCalculating
According to the thickness h of the root flat segments of each leaf spring2, the G that is calculated in step Ax-Di, i=1,2 ..., n are right The clamping stiffness K of the non-each leaf spring that structures is waited to lack piece parabolic type changeable section plate spring in endiIt is calculated, i.e.,
(2) the non-each leaf spring that structures is waited to lack piece parabolic type changeable section plate spring in end clamps endpoint power F in advanceiCalculating：
According to leaf spring the piece number n, the width b of leaf spring, half span LT, the half length L of root flat segments0, each leaf spring The thickness h of root flat segments2And the design requirement value of the pre- clamping stress of each leaf spring is σi, it is non-to end that structures is waited to lack piece parabolic The pre- clamping endpoint power F of each next leaf spring of line style changeable section plate spring mounting clipiIt is calculated, i=1,2 ..., n, i.e.,
(3) the non-each leaf spring initial tangential camber H that structures is waited to lack piece parabolic type changeable section plate spring in endgCiDetermine：
According to leaf spring the piece number n, root shim thickness δc, end pad thickness δe, the root flat segments thickness of each leaf spring h2, end the piece number section thickness h1i, the design requirement value H of the initial tangential camber of first leaf springgC1, it is non-to end that structures is waited to lack piece throwing The initial tangential camber H of each next leaf spring of object line style changeable section plate spring mounting clipgCiIt is determined, i=1,2 ..., n, i.e.,
(4) the non-free tangent line camber H of each leaf spring that structures is waited to lack piece parabolic type changeable section plate spring in endgi0Design：
According to leaf spring the piece number n, the K that is calculated in step (2)i, the F that is calculated in step (2)i, institute in step (3) Determining HgCi, the free tangent line camber H of each leaf spring that structures is waited to lack piece parabolic type changeable section plate spring non-to endgi0It is set Meter, i.e.,
The present invention has the advantage that than the prior art
Structures is waited to lack piece parabolic type changeable section plate spring previously for end is non-, it is non-not provided accurately and reliably end always Structures is waited to lack the design method of the free tangent line camber of piece changeable section plate spring, it is impossible to meet vehicle fast development and lack piece change to suspension and cut Panel spring modernizes the requirement of CAD design.The present invention can be according to leaf spring the piece number, the structural parameters of each leaf spring, elasticity modulus, root The next initial tangential camber of first leaf spring of the thickness and mounting clip of portion's gasket and end pad and the pre- clamping of each leaf spring The design requirement value of stress, it is non-to end wait structures lack piece parabolic type changeable section plate spring each leaf spring free tangent line camber into Row design.Structures is waited to lack the free tangent line arc of piece changeable section plate spring it is found that end provided by the present invention is non-by prototype test test High design method is correct, can obtain the design value of the accurately and reliably free tangent line camber of each leaf spring, non-etc. for end The design that structure lacks the free tangent line camber of each leaf spring of piece parabolic type changeable section plate spring provides reliable technical method.Utilize this Method can improve design level, reliability and the service life and vehicle safety of product；Meanwhile it can also reduce product Product development speed is accelerated in design and testing expenses.
Description of the drawings
For a better understanding of the present invention, it is described further below in conjunction with the accompanying drawings.
Fig. 1 is the non-design flow diagram that structures is waited to lack the free tangent line camber of piece parabolic type changeable section plate spring in end；
Fig. 2 is the non-hemihedrism clamping structure schematic diagram that structures is waited to lack piece parabolic type changeable section plate spring in end.
Specific embodiment
The present invention is described in further detail below by embodiment.
Embodiment one：The structures formula such as certain lacks the width b=60mm of piece parabolic type changeable section plate spring, half span LT= 570mm, the half length L for the root flat segments that U-bolts clamps0=50mm, elastic modulus E=200GPa.Leaf spring the piece number n =3, the root flat segments thickness h of each leaf spring2=18mm, the thickness h of the end flat segments of each leaf spring11=9mm, h12= h13=8mm, the thickness ratio β of parabolic segment1=h11/h2=0.5, β2=β3=h12/h2=h13/h2=0.444.Mounting clip is next First leaf spring initial tangential camber design requirement value be Hgc1=90mm, the design requirement of the pre- clamping stress of each leaf spring It is worth for σ1=-27.98MPa, σ2=0MPa, σ3=27.98MPa.Root shim thickness δc=3mm, end pad thickness δe= 6mm, according to leaf spring the piece number, the structural parameters of each leaf spring, elasticity modulus, the thickness and assembling of root shim and end pad The design requirement value of the initial tangential camber of first leaf spring after clamping and the pre- clamping stress of each leaf spring, non-to the end etc. The free tangent line camber that structure lacks each leaf spring of piece parabolic type changeable section plate spring is designed.
The non-design method that structures is waited to lack the free tangent line camber of piece changeable section plate spring in end that present example is provided, sets Flow is counted as shown in Figure 1, specific design procedure is as follows：
(1) the non-each leaf spring that structures is waited to lack piece parabolic type changeable section plate spring in end clamps stiffness KiCalculating
Step A：The pinching end point deformation coefficient G of each leaf springx-DiCalculating
According to leaf spring the piece number n=3, the width b=60mm of leaf spring, half span LT=570mm, the half of root flat segments Length L0=50mm, elastic modulus E=200GPa；The thickness ratio β of the parabolic segment of each leaf spring1=0.5, β2=0.444, β3 =0.444；The pinching end point deformation coefficient G of each leaf spring that structures is waited to lack piece parabolic type changeable section plate spring non-to the endx-Di It is calculated, i=1,2,3, i.e.,
Step B：The clamping stiffness K of each leaf springiCalculating
According to leaf spring the piece number n=3, the thickness h of the root flat segments of each leaf spring2=18mm is calculated in step A Gx-D1=87.88mm4/ N, Gx-D2=89.62mm4/ N, Gx-D3=89.62mm4/ N is non-to the end that structures is waited to lack the change of piece parabolic type The clamping stiffness K of each leaf spring of taper leaf springiIt is calculated, i=1,2,3, i.e.,
(2) the non-each leaf spring that structures is waited to lack piece parabolic type changeable section plate spring in end clamps endpoint power F in advanceiCalculating：
According to leaf spring the piece number n=3, the width b=60mm of leaf spring, half span LT=570mm, the half of root flat segments Length L0=50mm, the thickness h of the root flat segments of each leaf spring2The design of the pre- clamping stress of=18mm and each leaf spring will Evaluation σ1=-27.98MPa, σ2=0MPa, σ3=27.98MPa is non-to the end that structures is waited to lack piece parabolic type changeable section plate spring dress Pre- clamping endpoint power F with each leaf spring after clampingiIt is calculated, i=1,2,3, i.e.,
(3) the non-each leaf spring initial tangential camber H that structures is waited to lack piece parabolic type changeable section plate spring in endgCiDetermine：
According to leaf spring the piece number n=3, root shim thickness δc=3mm, end pad thickness δe=6mm, first leaf spring are initial The design requirement value H of tangent line cambergc=90mm, the root flat segments thickness h of each leaf spring2=18mm, end the piece number section thickness h11=9mm, h12=h13=8mm is non-to the end that structures is waited to lack each next leaf spring of piece parabolic type changeable section plate spring mounting clip Initial tangential camber HgCiIt is determined, i=1,2,3, i.e.,
HgC1=90mm；
HgC2=HgC1+(h2+δc)-(h11+δe)=96mm；
HgC3=HgC1+(h2+δc)-(h12+δe)=97mm.
(4) the non-free tangent line camber H of each leaf spring that structures is waited to lack piece parabolic type changeable section plate spring in endgi0Design：
According to leaf spring the piece number n=3, the K that is calculated in step (1)1=132.73N/mm, K2=130.14N/mm, K3= 130.14N/mm, the F being calculated in step (2)1=-174.36N, F2=0N, F3=174.36N, step (3) is middle to be determined HgC1=90mm, HgC2=96mm, HgC3=97mm, each sheet that structures is waited to lack piece parabolic type changeable section plate spring non-to the end The free tangent line camber H of springgi0It is designed, i=1,2,3, i.e.,
Structures is waited to lack the free tangent line arc of piece changeable section plate spring it is found that end provided by the present invention is non-by prototype test test High design method is correct, can obtain the design value of the accurately and reliably free tangent line camber of each leaf spring.
Embodiment two：The non-width b=60mm that structures formula is waited to lack piece parabolic type changeable section plate spring in certain end, half span LT =570mm, the half length L for the root flat segments that U-bolts clamps0=50mm, elastic modulus E=200GPa.Leaf spring the piece number N=4, the root flat segments thickness h of each leaf spring2=16mm, the end flat segments thickness h of each leaf spring11=8mm, h12=h13 =h14=7mm, the thickness ratio β of parabolic segment1=h11/h2=0.5, β2=β3=β4=h12/h2=0.4375.Root shim is thick Spend δc=3mm, end pad thickness δe=6mm.The initial tangential camber design requirement value H of first next leaf spring of mounting clipgC1 =95mm, the design requirement value of the pre- clamping stress of each leaf spring is σ1=-26.56MPa, σ2=-8.85MPa, σ3= 8.85MPa σ4=26.56MPa.According to leaf spring the piece number, the structural parameters of each leaf spring, elasticity modulus, root shim and end The design requirement of first next leaf spring initial tangential camber of the thickness and mounting clip of gasket and each pre- clamping stress of leaf spring Value, the free tangent line camber of each leaf spring that structures is waited to lack piece parabolic type changeable section plate spring non-to the end are designed.
It is non-to the end that structures is waited to lack piece parabolic type board of variable section using the design method and step identical with embodiment one The free tangent line camber of each leaf spring of spring is designed, and specific design procedure is as follows：
(1) the non-each leaf spring that structures is waited to lack piece parabolic type changeable section plate spring in end clamps stiffness KiCalculating
Step A：The pinching end point deformation coefficient G of each leaf springx-DiCalculating
According to leaf spring the piece number n=4, the width b=60mm of leaf spring, half span LT=570mm, the half of root flat segments Length L0=50mm, elastic modulus E=200GPa；The thickness ratio of the parabolic segment of each leaf spring is respectively β1=0.5, β2=β3 =β4=0.4375；The pinching end point deformation coefficient of each leaf spring that structures is waited to lack piece parabolic type changeable section plate spring non-to the end Gx-DiIt is calculated, i=1,2,3,4, i.e.,
Step B：The clamping stiffness K of each leaf springiCalculating
According to leaf spring the piece number n=4, the thickness h of the root flat segments of each leaf spring2=16mm is calculated in step A Gx-D1=87.88mm4/ N, Gx-D2=Gx-D3=Gx-D4=89.81mm4/ N is non-to the end that structures is waited to lack piece parabolic type variable cross-section The clamping stiffness K of each leaf spring of leaf springiIt is respectively calculated, i=1,2,3,4, i.e.,
(2) the non-each leaf spring that structures is waited to lack piece parabolic type changeable section plate spring in end clamps endpoint power F in advanceiCalculating：
According to leaf spring the piece number n=4, the width b=60mm of leaf spring, half span LT=570mm, the half of root flat segments Length L0=50mm, the thickness h of the root flat segments of each leaf spring2The design of the pre- clamping stress of=16mm and each leaf spring will Evaluation σ1=-26.56MPa, σ2=-8.85MPa, σ3=8.85MPa, σ4=26.56MPa is non-to the end that structures is waited to lack piece parabolic The pre- clamping endpoint power F of each next leaf spring of line style changeable section plate spring mounting clipiIt is calculated, i=1,2,3,4, i.e.,
(3) the non-each leaf spring initial tangential camber H that structures is waited to lack piece parabolic type changeable section plate spring in endgCiDetermine：
According to leaf spring the piece number n=4, root shim thickness δc=3mm, end pad thickness δe=6mm, the root of each leaf spring Portion's flat segments thickness h2=16mm, the thickness h of the end flat segments of each leaf spring11=8mm, h12=7mm, h13=7mm, h14= 7mm, the design requirement value H of the initial tangential camber of first leaf springgc=80mm is non-to the end that structures is waited to lack the change section of piece parabolic type The initial tangential camber H of each next leaf spring of panel spring mounting clipgCiIt is determined, i=1,2,3,4, i.e.,
HgC1=95mm；
HgC2=HgC1+(h2+δc)-(h11+δe)=100mm；
HgC3=HgC1+(h2+δc)-(h12+δe)=101mm；
HgC4=HgC1+(h2+δc)-(h13+δe)=101mm.
(4) the non-free tangent line camber H of each leaf spring that structures is waited to lack piece parabolic type changeable section plate spring in endgi0Design：
According to leaf spring the piece number n=4, the K that is calculated in step (1)1=93.22N/mm, K2=K3=K4=91.21N/ Mm, the F being calculated in step (2)1=-130.77N, F2=-43.59N, F3=43.59N, F4=130.77N, step (3) In identified HgC1=95mm, HgC2=100mm, HgC3=101mm, HgC4=101mm is non-to the end that structures is waited to lack piece parabola The free tangent line camber H of each leaf spring of type changeable section plate springgi0It is designed respectively, i=1,2,3,4, i.e.,
Structures is waited to lack the free tangent line arc of piece changeable section plate spring it is found that end provided by the present invention is non-by prototype test test High design method is correct, can obtain the design value of the accurately and reliably free tangent line camber of each leaf spring, non-etc. for end The design that structure lacks the free tangent line camber of each leaf spring of piece parabolic type changeable section plate spring provides reliable technical method.Utilize this Method can improve design level, reliability and the service life and vehicle safety of product；Meanwhile it can also reduce product Product development speed is accelerated in design and testing expenses.

Claims (1)

1. the non-design method that structures is waited to lack the free tangent line camber of piece changeable section plate spring in end, wherein, a hemihedrism of each leaf spring Structure is made of root flat segments, parabolic segment and end flat segments, and root flat segments clamp for U-bolts assembling, respectively The thickness of piece leaf spring root flat segments is equal, and the end flat segments of each leaf spring are non-to wait structures, the end flat segments of first leaf spring Thickness and length, more than the thickness and length of the end flat segments of other each leaf spring, i.e., end is non-waits structures to lack piece parabolic type Changeable section plate spring；The free tangent line camber of each leaf spring decide that assembling is pre- and clamp after first leaf spring initial tangential camber and each The pre- clamping stress of piece leaf spring；According to leaf spring the piece number, the structural parameters of each leaf spring, elasticity modulus, root shim and end are padded The design requirement value of first next leaf spring initial tangential camber of the thickness and mounting clip of piece and each pre- clamping stress of leaf spring, The free tangent line camber of each leaf spring that structures is waited to lack piece parabolic type changeable section plate spring non-to end is designed, it is characterised in that Using design procedure in detail below：
(1) the non-each leaf spring that structures is waited to lack piece parabolic type changeable section plate spring in end clamps stiffness KiCalculating
Step A：The pinching end point deformation coefficient G of each leaf springx-DiCalculating
According to leaf spring the piece number n, the width b of leaf spring, half span LT, the half length L of root flat segments0, elastic modulus E, each The thickness h of the root flat segments of leaf spring2, the thickness h of end flat segments1i, the thickness ratio β of parabolic segmenti=h1i/h2, i=1, 2 ..., n, the pinching end point deformation coefficient G of each leaf spring that structures is waited to lack piece parabolic type changeable section plate spring non-to endx-DiIt carries out It calculates, i.e.,
Step B：The clamping stiffness K of each leaf springiCalculating
According to the thickness h of the root flat segments of each leaf spring2, the G that is calculated in step Ax-Di, i=1,2 ..., n, to end The clamping stiffness K of the non-each leaf spring that structures is waited to lack piece parabolic type changeable section plate springiIt is calculated, i.e.,
(2) the non-each leaf spring that structures is waited to lack piece parabolic type changeable section plate spring in end clamps endpoint power F in advanceiCalculating：
According to leaf spring the piece number n, the width b of leaf spring, half span LT, the half length L of root flat segments0, the root of each leaf spring The thickness h of flat segments2And the design requirement value of the pre- clamping stress of each leaf spring is σi, it is non-to end that structures is waited to lack piece parabolic type The pre- clamping endpoint power F of each next leaf spring of changeable section plate spring mounting clipiIt is calculated, i=1,2 ..., n, i.e.,
(3) the non-each leaf spring initial tangential camber H that structures is waited to lack piece parabolic type changeable section plate spring in endgCiDetermine：
According to leaf spring the piece number n, root shim thickness δc, end pad thickness δe, the root flat segments thickness h of each leaf spring2, end Portion's the piece number section thickness h1i, the design requirement value H of the initial tangential camber of first leaf springgC1, it is non-to end that structures is waited to lack piece parabolic type The initial tangential camber H of each next leaf spring of changeable section plate spring mounting clipgCiIt is determined, i=1,2 ..., n, i.e.,
(4) the non-free tangent line camber H of each leaf spring that structures is waited to lack piece parabolic type changeable section plate spring in endgi0Design：
According to leaf spring the piece number n, the K that is calculated in step (2)i, the F that is calculated in step (2)i, step (3) is middle to be determined HgCi, the free tangent line camber H of each leaf spring that structures is waited to lack piece parabolic type changeable section plate spring non-to endgi0It is designed, I.e.
CN201810051232.8A 2018-01-19 2018-01-19 The non-design method that structures is waited to lack the free tangent line camber of piece changeable section plate spring in end Withdrawn CN108223651A (en)

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Application publication date: 20180629