Physical balance?

Looking at the mass and support structure of an automobile from a Physics point of view, there are many elastic bodies from ground contact to heavy objects, and it can be said that all of them are always in an antagonistic relationship. If you let it collapse, the antagonism will collapse, and all the other parts that were antagonizing will displace and cause position movement according to "the law of action & reaction".

From another point of view, that the weight 200 kg or more from the tire to the engine & transaxle mount to arm and link bush supports through movable and eligible floating materials. You will be forced to make precision mechanical adjustments in a floating environment with viscoelasticity supported by rubber materials.

Ordinary small cars are about 1.5 tons. It is necessary to move this delicately to loosen and tighten bolts and nuts such as 17mm and 19mm while considering the position movement due to friction. Under 1G conditions, a 4-post lift is available. If necessary adjustments are made, the tension friction on the tire contact patch will change as described above, so the vehicle must be moved back and forth to release stress on the tire surfaces. The driver's seat has a balance weight of 60 kg burdened, so moving vehicle is performed by human power with gear neutral. The measuring device that is manually performed is removed and installed each time repeatedly. It consumes physical strength, but the concentration of energy cannot be resolved. It is a different dimension of the battle with oneself, which is completely different from the periodical maintenance work such as regular inspection and parts replacement.

Such barren work unknown when to finish can be solved at once by installing only one adjustment mechanism! It is the introduced a thrust trim adjustment mechanism! Although the purpose and concept are different, MB company's luxury model 4WS mechanism is currently adopted in it. It is true that it costs money to introduce the trim, but it is equipped with a meaningless idle stop system for a while with the intention of the Government. On the other hand, this is an indispensable device at any rate, and if it is mass-produced, the cost should be reduced.

As an airplane pilot always make trim adjustments after takeoff and climb without exception, so a car driver can also make thrust adjustments so that he can drive safely and comfortably under the load conditions at that time. I do wonder why they don't do it? I'm sure that the engineers in this field should know about this truth and fact, they do not take action because the automobile users never argue about this critical problem.