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Ch9 Gears
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Epicyclic or Planetary Gears
annulus
: outer ring gear which meshes with the planet gears
carrier:
movable arm
2 DOF
system requires control of 2 inputs to produce 1 output
high torque output
load shared equally across planet gears means longer life for each
total motion of any gear is sum of motion of arm and motion of gear with respect to arm
if arm were stationary would get a simple gear train
=> all motion relative to arm is analyzed as simple gear train
Differential Mechanism
receives 1 input and produces 2 outputs
designed to drive a pair of wheels with equal torque while allowing them to rotate at different speeds
a vehicles wheels rotate at different speeds especially when turning corners
when turning outside wheel rotates faster and inside wheel rotates slower
Fundamental Law of Gearing
The angular velocity ratio
m
v
is constant at all positions
The torque ratio
m
T
is constant at all positions
Gear tooth contours on mating teeth must be conjugates (involute curve)
Involute Curve
size of teeth must be the same for gears to mesh
Author
sep293
ID
84959
Card Set
Ch9 Gears
Description
Mechanisms Final
Updated
5/10/2011, 6:04:45 AM
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