Calculating steering rack axial forces?

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SUMMARY

The discussion focuses on calculating the minimum force required on the knuckle for vehicle steering, emphasizing the significance of normal load due to the vehicle's weight. Key parameters mentioned include kingpin angle, scrub radius, knuckle arm, and caster. The concept of self-aligning torque is highlighted as a critical factor in this calculation. Participants seek guidance on how to integrate these variables effectively to determine the necessary steering force.

PREREQUISITES
  • Understanding of vehicle dynamics and steering geometry
  • Familiarity with terms such as kingpin angle and scrub radius
  • Knowledge of forces acting on a vehicle during turning
  • Basic principles of torque and its application in steering systems
NEXT STEPS
  • Research the calculation of self-aligning torque in steering systems
  • Explore the impact of kingpin angle on steering performance
  • Study the relationship between scrub radius and vehicle handling
  • Learn about the effects of caster angle on steering stability
USEFUL FOR

Automotive engineers, vehicle dynamics specialists, and anyone involved in the design or analysis of steering systems will benefit from this discussion.

thiru
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Hello

I tried to calculate the minimum force needed to apply on the knuckle to make a turn.

The important factor is the normal load (due to the weight of the vehicle) when the vehicle is not moving. I know the kingpin angle, scrub radius, knuckle arm, caster. But I am not sure how to proceed forward. Any help will be appreciated.
 
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Look for self-aligning torque:

SAT.jpg
 

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