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Title:

PLANETARY GEARS

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Hold sun gear, drive planet carrier. Hold internal gear, drive planet carrier. Higher ratio overdrive. DIRECT DRIVE Input and output speed are the same. – PowerPoint PPT presentation

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Title: PLANETARY GEARS


1
PLANETARY GEARS
  • Chapter 4
  • Page 61
  • Classroom Manual

2
PLANETARY GEARS SHAFTS
  • Describe how different gear ratios are obtained
    from a planetary gear set.
  • Identify components of a planetary gear set
    their operation.
  • Describe the different designs of compound
    planetary gear sets.
  • Describe the construction and operation of
    typical Simpson gear train.

3
INTRODUCTION
  • Automatic Transmissions provide different gear
    ratios for performance and economy over the
    entire driving range.
  • Ratios are selected manually (driver) or
    automatically (hydraulically).
  • A planetary gear set consists of a sun gear, a
    planet carrier, internal gear.

Page 61
4
SIMPLE PLANETARY GEAR SETS
  • Planetary gear sets are typically helical cut
    gears.
  • Sun gear is in the center.
  • Planet gears rotate around the sun gear.
  • The Ring, Annulus, or Internal gear is the outer
    gear of the set.

Page 61
5
SIMPLE PLANETARY GEAR SETS
Page 61
6
SIMPLE PLANETARY GEAR SETS
  • Planet gears are in constant mesh with the Sun
    and Internal gears.
  • Number of planet gears depends on the load the
    transmission was designed for.
  • A planet gear set can provide (1) gear reduction,
    (2) overdrive, (3) direct drive, (4) reverse, or
    a (5) neutral position.

Page 62
7
SIMPLE PLANETARY GEAR SETS
  • When a smaller gear drives a larger gear, output
    speed is decreased.
  • When a larger gear drives a smaller gear, output
    speed is increased.
  • When a external gear drives another external
    gear, output direction is reversed.

Page 63
8
SIMPLE PLANETARY GEAR SETS
  • When a external gear is in mesh with an internal
    gear, the two gears will rotate in the same
    direction.
  • Clutch packs and bands are used to hold or
    release the members of the planetary gear set to
    get the proper direction of rotation and/or ratio.

Page 63
9
GEAR REDUCTION
  • When the output gear turns at a slower speed then
    the input gear, gear reduction has occurred and
    results in increased torque output.
  • 2 ways to get reduction
  • Hold sun gear, drive internal gear.
  • Hold internal gear, drive sun gear. Lower ratio.

Page 63
10
OVERDRIVE
  • When output speed is greater than input speed,
    overdrive is achieved.
  • 2 ways to get overdrive.
  • Hold sun gear, drive planet carrier.
  • Hold internal gear, drive planet carrier. Higher
    ratio overdrive.

Page 64
11
DIRECT DRIVE
  • Input and output speed are the same.
  • Drive any two members of the planet and the
    result is direct drive.

Page 64
12
REVERSE
  • Input rotation direction is reversed.
  • 2 ways to get reverse.
  • Hold planet carrier, drive planet carrier.
  • Hold planet carrier, drive sun gear. This is
    reverse overdrive.

Page 64
13
NEUTRAL
  • Input but no output.
  • When no member of the planetary set is held or
    locked to another, there will be no output
    regardless of which member receives the input.

Page 65
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