In the first chapter it determines precisely, the dynamics-efficiency,
but at the gears transmissions, the dynamics efficiency is the same like
the mechanical efficiency; this is a greater advantage of the gears
transmissions. This advantage, specifically of the gear's mechanisms,
may be found at the cam mechanisms with plate followers as well. In the
second chapter one presents shortly an original method to obtain the
efficiency of the geared transmissions in function of the contact ratio.
With the presented relations it can make the dynamic synthesis of the
geared transmissions having in view increasing the efficiency of gearing
mechanisms in work. We calculate the efficiency of a geared
transmission, having in view the fact that at one moment there are
several couples of teeth in contact, and not just one. The start model
has got four pairs of teeth in contact (4 couples) concomitantly. The
best efficiency can be obtained with the internal gearing when the drive
wheel 1 is the ring; the minimum efficiency will be obtained when the
drive wheel 1 of the internal gearing has external teeth. For the
external gearing, the best efficiency is obtained when the bigger wheel
is the drive wheel; when we decrease the normal angle alpha0, the
contact ratio increases and the efficiency increases as well. The
efficiency increases too, when the number of teeth of the drive wheel 1
increases (when z1 increases). Nearly all the models studied the dynamic
on gearing with axes parallel, is based on mechanical models of
classical (known) who is studying spinning vibration of shafts gears and
determine their own beats and strains of shafts spinning; sure that they
are very useful, but are not actually join formed of the two teeth in
contact (or more pairs of teeth in contact), that is not treated
physiology of the mechanism itself with toothed gears for a view that
the phenomena are dynamic taking place in top gear flat; model [1]
just try this so, but the whole theory is base
