I've just visited this topic and wanted to make sure i got it right. Not calculating all the moments created and in static situation (no loads transfer)... is this calculation right??
Thank you very much
PS1. Obviously first equation is sumatory of all horizontal forces and for the second one the vertical forces..
PS2. Sorry about the quality, i've just done it with paint... as you can clearly see
I really wish it where so simple. Unfortunately it is not.
All the forces do not go through the push rod and the lower wishbone as you might suggest from the diagram. There is the upper arm, That will take some forces and also the tie rod has to be put in the mix.
For example it is not necessary that R is acting at the same point where s1 and s2 intersect(say D). It fact that is rarely the case. So taking moments about D, there will be nothing to balance out the R there fore we need another s3 in form of the upper control arm.
A similar thing will happen in the side view and you'll need a tie rod to satisfy moments about the king pin axis.