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1.25 in Dia. Ratio 105 Torqe 50 in-lb
The most important feature of the Y type planetary gearing
is that each planet gear can mesh simultaneously with three concentric
gears of different numbers of teeth. If we reduce one concentric
gear, e.g., the sun gear, then each planet gear may mesh with only the
two ring gears. This forms either a U type planetary gearing or
a KHV planetary gearing with ZERO gearing. In other words,
they are modified from and covered by the US Patent of the Y
Type Planetary Gearing.
Essentially the U type consists of only two pairs of
internal gearing and needs no carrier. Thus, its structure is very simple.
In an internal pair, the two conjugating surfaces are concave versus convex,
which decreases the contact stress. Moreover, optimum parameters enable
the U type to provide the multi-pair teeth contact to share
the load. Therefore, the U gearing can transmit a large torque with
a small size. The U type costs less and is an ideal candidate
for a transmission that requires large torque, high ratio, and limited
space.
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