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摘要

Abstract

The suspension is one of the modern automobile assembly, frame and the axle flexibleconnection up. Its primary function is to pass the role of force and torque between the wheelsand the frame to ease the load of the road to pass the impact of the frame, the attenuation caused by the vibration of the bearing system ensure riding comfort.

Based on thepopulation parameters of the intermediate car, I designed front suspension system.The design uses a double wishbone suspension, and tests four years of college learning outcomes. Specification includes double wishbone suspension introduced, the main parameters determining the damper selection and calculation of the elastic element in the form of selection and calculation guide mechanism design, design calculations stabilizer bar, and use MATLAB to major parts calculation checked.

CATIA modeling of computer-aided design (parts and assembly drawings), computer-aided design CAD drawing (drawing) equivalent to 2.5 A0 drawings, translate foreign data copy editing a manual included in the design.

Key words: double wishbone suspension，guide mechanism，absorber，absorber springs，stabilizer bar

Abstract    1

1. Introduction    1

1.1. Background and Research Significance    1

1.2. Research purpose and main content    2

1.3. Double wishbone independent suspension    2

1.3.1. Features of double wishbone independent suspension    2

1.3.2.Applicable models    3

2. Determination of the overall layout of the suspension and the main parameters    4

2.1. Overall layout of the suspension    4

2.2. Suspension main parameters    4

2.2.1. Suspension Static Deflection    4

2.2.2. Suspension stiffness    5

2.2.3. Suspension Dynamic Deflection    5

3. Design of suspension guide mechanism    6

3.1. Design requirements for guides    6

3.2. Arrangement parameters of the guide mechanism    6

3.2.1. Roll Center    6

3.2.2. The trim center    8

3.2.4. Arrangement of Upper and Lower Cross-arms in the Longitudinal Plane    8

3.2.5. Arrangement of upper and lower cross-arms in the transverse plane    10

3.2.6. Plan for arranging the swing axes of the upper and lower horizontal arms in the horizontal plane.    10

3.2.7. Determination of upper and lower cross arm lengths    12

3.2.8. Preliminary Selection of Front Wheel Positioning Parameters    13

4. Calculation of elastic elements    14

4.1. Selection of Helical Spring Materials    14

4.2. Stiffness of Helical Spring    14

4.3. Calculate the diameter of the spring    15

4.4. Spring Check    16

5. Selection of structural types and main parameters of shock absorbers    18

5.1. Classification of shock absorbers    18

5.2. Working principle of double-tube hydraulic shock absorber    19

5.3. Design and Calculation of Shock Absorber Parameters    22

5.3.1. Relative Damping Factor Design    22

5.3.2. Selection of shock absorber damping coefficient    23

5.3.3. Determination of the maximum unloading force of the shock absorber    23

5.3.4. Diameter Design of Shock Absorber Working Cylinder    24

6. Lateral stabilizer bar design calculation    27

6.1. The role of the stabilizer bar    27

7. Simulation design of guide mechanism    30

7.1. Simulation Design and Analysis    30

7.1.1. Toe Angle    31

7.1.2. Camber Angle    31

7.13.Kingpin Inclination Angle    32

7.1.4. Caster Angle    32

8. Suspension 3D model design    33

  in conclusion    35

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