多于两个齿轮组成的齿轮系统称为轮系.ppt

Chapter 10. Gear Trains
content
Know about the gear train and the classification
can calculate the transmit ratio of different gear trains
know about the mechanical efficiency of ary gear train
the tooth numbers of gear and number of
The difficulties
How to measure off the types of different gear trains correctly .
How to calculate the transmit ratio ,how to design the tooth of gear in the gear trains.
§10-1 Gear Train and its classification
What is gear train?
Such a transmission system with more than a pair of gears is called a gear train
多于两个齿轮组成的齿轮系统称为轮系。
2. Classification
Gear train with Fixed Axes
/Ordinary Gear Train
(定轴轮系)
The position of all gear axes in a gear train are fixed when it works.
Gear trains with fixed parallel axes
Gear trains with fixed non-parallel axes
gear train(周转轮系)
At least one gear axis in a gear train rotates around the fixed axis of other gears, this kind of gear train is ca1led an epicyclic gear train.
Sun gear(太阳轮): The gears rotating around fixed axis are called sun gears.
gear(行星轮): In a gear train ,the gear rotates around the fixed axis,at the same time ,it also rotates relatively to the link H around it is own axis.
carrier(行星架/系杆): The link carrying gears is called the carrier,。
fundamental members :
H
3
2
1
3
4
1
2
3
4
4
2
1
Differential gear trains(差动轮系) :
degree of freedom is 2 .
ary gear train (行星轮系):
degree of freedom is 1 .
差动轮系
行星轮系
6
5
7
H
3
4
2
1
bined gear train is bination of several epicyclic gear trains or bination of at least one epicyclic gear train with at least one ordinary gear train .
周转轮系
定轴轮系
6
1
2
3
H1
4
5
H2
周转轮系2
周转轮系1
gear train(混合轮系)
Classification:
ordinary gear train or gear train with fixed axes. (定轴轮系)
Epicyclic gear train. (周转轮系)
Gear train
Gear train with fixed axes
Epicyclic gear trains
Gear trains with fixed parallel axes
Gear trains with fixed non-parallel axes
Elementary epicyclic gear trains
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