机械原理教学课件：Chapter 5 Gear Train
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1 Definition & Classification of Gear Trains 2 Ordinary Gear Trains 3 Epicyclic Gear Trains 4 Combined Gear Trains 5 Conclusions
5.1 Definition & classification of gear trains
5.1 Definition & classification of gear trains
Ordinary Gear Trains
When the gear train runs, the rotation axis of all gears is fixed relative to the fixed
5.1 Definition & classification of gear trains
Definition of Gear Trains
Gear Trains: A combination of gears used to transmit motion from one shaft to another.
Planetary gear trains
5.1 Definition & classification of gear trains
Planetary Gear Trains
H — Planet carrier (arm)
Basic links
1 — Sun gear (center gear) 2 — Planet gear
3 — Ring gear
2 2
2
H
H
H1
1
1
3
3
3
5.1 Definition & classification of gear trains
Epicyclic Gear Trains
Basic epicyclic gear train can be classified based on the degree of freedom: Planetary gear train, differential gear train.
External gearing
Dual gears
1
3’
2’ 4
2
3
Internal
gearing
5
Planar ordinary gear trains
Worm
1
2’
2
Worm
gear
3
3’
Bevel gears
4
Spatial ordinary gear trains
5.1 Definition & classification of gear trains
5.1 Definition & classification of gear trains
1 Definition & Classification of Gear Trains 2 Ordinary Gear Trains 3 Epicyclic Gear Trains 4 Combined Gear Trains 5 Conclusions
Gear 3 is fixed
Degree of freedom: F = 1
Planetary gear train
5.1 Definition & classification of gear trains
frame.
5.1 Definition & classification of gear trains
Ordinary Gear Trains
When the gear train runs, the rotation axis of all gears is fixed relative to the frame.
5.1 Definition & classification of gear trains
Classification of Gear Trains According to whether the rotation axes of each gear is fixed or not,
there are three types：
Planetary Gear Trains
When the gear train runs, at least the rotation axis of one gear is not fixed relative to the frame, this axis is rotating along the axis of other gears which have fixed axes.
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Chapter 5 Gear Train
Chapter 5 Gear Trains
www.themegallery.com
1 Definition & classification 2 Ratio of gear trains 3 Design of planetary gears 4 Use of gear trains
Ordinary gearቤተ መጻሕፍቲ ባይዱtrains Epicyclic gear trains
Combined gear trains
5.1 Definition & classification of gear trains
1 Definition & Classification of Gear Trains 2 Ordinary Gear Trains 3 Epicyclic Gear Trains 4 Combined Gear Trains 5 Conclusions
Degree of freedom: F = 2
Differential gear train
5.1 Definition & classification of gear trains
Epicyclic Gear Trains
Basic epicyclic gear train can be classified based on the degree of freedom: planetary gear train, differential gear train.
5.1 Definition & classification of gear trains
5.1 Definition & classification of gear trains
Ordinary Gear Trains
When the gear train runs, the rotation axis of all gears is fixed relative to the fixed
5.1 Definition & classification of gear trains
Definition of Gear Trains
Gear Trains: A combination of gears used to transmit motion from one shaft to another.
Planetary gear trains
5.1 Definition & classification of gear trains
Planetary Gear Trains
H — Planet carrier (arm)
Basic links
1 — Sun gear (center gear) 2 — Planet gear
3 — Ring gear
2 2
2
H
H
H1
1
1
3
3
3
5.1 Definition & classification of gear trains
Epicyclic Gear Trains
Basic epicyclic gear train can be classified based on the degree of freedom: Planetary gear train, differential gear train.
External gearing
Dual gears
1
3’
2’ 4
2
3
Internal
gearing
5
Planar ordinary gear trains
Worm
1
2’
2
Worm
gear
3
3’
Bevel gears
4
Spatial ordinary gear trains
5.1 Definition & classification of gear trains
5.1 Definition & classification of gear trains
1 Definition & Classification of Gear Trains 2 Ordinary Gear Trains 3 Epicyclic Gear Trains 4 Combined Gear Trains 5 Conclusions
Gear 3 is fixed
Degree of freedom: F = 1
Planetary gear train
5.1 Definition & classification of gear trains
frame.
5.1 Definition & classification of gear trains
Ordinary Gear Trains
When the gear train runs, the rotation axis of all gears is fixed relative to the frame.
5.1 Definition & classification of gear trains
Classification of Gear Trains According to whether the rotation axes of each gear is fixed or not,
there are three types：
Planetary Gear Trains
When the gear train runs, at least the rotation axis of one gear is not fixed relative to the frame, this axis is rotating along the axis of other gears which have fixed axes.
www.themegallery.com
Chapter 5 Gear Train
Chapter 5 Gear Trains
www.themegallery.com
1 Definition & classification 2 Ratio of gear trains 3 Design of planetary gears 4 Use of gear trains
Ordinary gearቤተ መጻሕፍቲ ባይዱtrains Epicyclic gear trains
Combined gear trains
5.1 Definition & classification of gear trains
1 Definition & Classification of Gear Trains 2 Ordinary Gear Trains 3 Epicyclic Gear Trains 4 Combined Gear Trains 5 Conclusions
Degree of freedom: F = 2
Differential gear train
5.1 Definition & classification of gear trains
Epicyclic Gear Trains
Basic epicyclic gear train can be classified based on the degree of freedom: planetary gear train, differential gear train.