Suspension automotive

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 Spring Rates, Wheel Rates, Motion  Ratios and Roll Stiffness Stiffness Appendix 1

ME 470 Vehicle Structural Design Dr. Richard Hathaway, P.E., Professor Mechanical and Aeronautical Engineering  

 

 Spring Rate Calculations

 Spring Rate Calculations Calculations 

Coil Spring Calculations:  K =

G d 4 64 R3 N 

K = Spring Rate in lbs/in G = Modulus of rigidity lbs/in d = Spring R = Mean Radius of the Spring Spring Wire Diameter N = Number of Active Coils Squared and Ground Ends -1.75 turns Squared or Closed Ends    ---Plain Ends -0.5 turns Plain ends Ground -1.0 turns

G = 

 E  2 (1 + µ  )

 Spring Rate Calculations Calculations 

Coil Spring Calculations: 

If Steel is used: psi

 K  ≅ 

E = 30,000,000

1,500,000 d 4 3

 D  N 

 Spring Rate Calculations Calculations 

Torsion Bar Rates:  

θ  =

TL

T   JG

 JG

θ 

L

=

d

 L L = Bar Length

  π  d 4  J  = 32

d = Diameter



Bar

4

T  = π  d  G θ  32 L Let the deflection at the end = δ

θ

r = lever arm length

θ   =

δ  r 

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