I don't know of how many steering systems use Rack and pinion anymore, look at a karts steering system for simplicity
Greg Locock wrote:Here's how the forces get from the contact patch to the steering wheel rim. The lateral force at the contact patch FY acts a certain distance behind the kingpin axis, T , generating a moment MKP=T*FY. This is reacted by a force FTR in the tie rod, where FTR=MKP*steering lever arm, which is roughly the distance of the OTR to the wheel centre in side view.
In a rack and pinion we usually characterise the gear ratio as the C factor, mm of rack travel for one turn of the pinion.
rack force is the sum of the two tie rod forces.
Rack force*C/1000=2*pi*steering column torque.
steering column torque=steering wheel torque
SWT=force from one hand at rim*dia of steering wheel, if you are using both hands.
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