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Since there are multi-pair teeth in contact to share the torque and to
reduce the stress on the tooth, the capacity of the KHV planetary
gearing is not limited by its tooth strength, but by the other parts, usually
the equal velocity mechanism. Transmitting motion and torque between two
parallel shafts, the equal velocity mechanism acts like a coupling, such
as the universal joint. However, the ordinary coupling or joint is too
large and will nullify the most important feature of the KHV, small
size.
In an ordinary gear coupling, if the two shafts are not coaxial, there
will be interference or jam. If the eccentricity between the two shafts
is small enough, it may be compensated by a large backlash or a big clearance
between the meshing teeth, which, however, will incur impact or dynamic
load, and an uneven motion.
Consisting of only a pair of internal gears with the teeth difference
between the two gears being zero, the Zero is essentially a special
gear coupling. Through optimum programming designs, it is possible to search
a particular pattern of engagement. This makes the Zero smoothly
transmit both motion and torque between two parallel and non-coaxial
shafts. Being a pair of internal gears, the zero type has low contact stress,
and the multi-pair teeth contact can share the load. Consequently, the
Zero gearing is stronger and much simpler than any other types of
equal velocity mechanism.
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