Deeper consideration on "Thrust Angle" in an automobile led me some conclusion that the steering linkage constructive design should have any way to cheat a driver as if the driven car might has no discrepancy in wheel alignments and constructive axle geometry. There must be some suspicion in the setting of steering rack case mounting mechanism, too much compliance might be applied sometimes with hysteresis phenomena. Actually, any precise wheel alignment adjustments are not performed by a manufacturers for passenger's automobiles, just assembling the parts with pre-dimensioning, final setup and adjusting procedures are omitted for cost saving principle. Especially, Japanese Road Trucking Vehicle Act does not have this important regulation except frontal side slip value, within plus minus 5mm/m. On the other hand, European Vehicle Safety Standard regulates the thrust angle within plus minus 10 minutes angle value. I happen to see some secret paper in ***ks **en Japan AG, the tolerance in thrust angle has been rewritten from 10 minutes in Germany into 20 minutes for the export to Japan. Suppose, no regulation exists on thrust angle tolerance in Japan, it takes some cost to re-adjust the trust error to adopt with European Standard, then what opinion would come out in the manager's mind of the manufacturing factory?
Consideration on Thrust Angle
