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摘要

Abstract

Suspension is one of the important components of the car, is the frame and axle between all the force connection device in general.Its role is to tansmit the force and torque from the road work on the wheel to the frame, to ensure the normal driving of the car.At the same time eases the impact when driving due to the uneven pavement caused by cars,and attenuate vibration,to ensure the comfort of passengers and car ride comfort.

This paper mainly completes the improved design of the steel plate spring suspension of ZYP5031XXPY pure electric vehicle.At first of the design,we should understand the present situation and development direction of the electric vehicle suspension and summary the structural classification and design requirements of the suspension.Then determine the direction of improvement towards light weight and car ride comfort,change the multi-piece leaf spring into small pieces.The rear suspension is a small piece of variable cross section steel leaf spring non-independent suspension.And finally complete the design and calculation of the parameters of the suspension components.we should first grasp the ZYP5031XXPY pure electric vehicle suspension main performance parameters when calculating,Including wheelbase, load, dynamic deflection, deflection and so on.Then design and calculate the suspension elastic element,Including determination of plate spring length, width, thickness, and the number of pieces.And then design other small parts and check their strength.Finally, analyze the design content and results,and use CATIA and other mapping software to complete assembly drawings and parts of the drawing of Rear plate spring suspension of the ZYP5031XXPY pure electric vehicle after being improved.

Key words:Plate spring suspension;Independent suspension;electric car;Structural design

Content

1.Preface    1

  1.1.Development Status and Prospect of Electric Vehicles    1

  1.2.The problem of this car suspension    2

  1.3.The purposeand and the design requirements of the suspension study    2

  1.4.The main problem that should be solved in this design    3

2.Determine the suspension structure    4

2.1.The composition of the vehicle suspension and the role of each component    4

2.2.Structure and characteristics of independent suspension and non - independent suspension    4

  2.3.Determination of rear suspension system    5

3.Determination of the main parameters of the suspension    5

3.1.determination of suspension Static deflection    5

  3.2. Determination of Suspension Dynamic Deflection    6

  3.3.Suspension Elasticity    6

  3.4.Suspension roll angle stiffness and its distribution in the rear axle    7

4.Design of suspension elastic elements    7

 4.1. Selection of steel plate spring type    7

  4.2. Determination of steel plate spring material    8

  4.3. Plate spring full load arc height    9

  4.4. Determination of the length of the leaf spring main leaf    9

  4.5. Determination of the number of leaf springs    10

  4.6. Determination of cross-sectional shape and number of steel plates    10

  4.7.Calculation of steel plate spring stiffness    10

  4.8. Determination of maximum stress point and stress calculation of leaf spring    13

  4.9. Check the strength of the leaf spring    16

5.Design of shock absorbers    17

5.1. Classification and selection of shock absorbers    17

  5.2. Relative damping coefficient    18

  5.3. Determination of damping coefficient  of shock absorber    19

  5.4. Determination of maximum unloading force    20

  5.5. Determination of the diameter D of the cylinder of the drum shock absorber    20

Summary    21

References    22

Acknowledgment    23

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