机械原理 英汉双语 教学课件 ppt 作者 张春林 Chapter 8 Design of Gear Trains
26页1、Chapter 8 Design of Gear Trains,8.1 Classification of Gear Trains,A gear train is a combination of gears used to transmit motion from one shaft to another. Fig 8-1a shows a gear box in an automobile; there are many pairs of gears to transmit different motion. Fig 8-1b shows a quartz watch in which the hour hand, minute hand and second hand rotate as their definite gear ratios to indicate the times.,Fig.8-1 Application of gear trains(轮系的应用) 1、2clutch (离合器) 3、4driving shaft (输入轴) 5gear train (轮系),
2、1.Ordinary Gear Trains,1) Simple ordinary gear train. It is a gear train in which each shaft carries only one gear, as shown in Fig 8-2a. 2) Compound gear train. It is a gear train in which at least one shaft carries more than one gear, as shown in Fig 8-2b. This will be a parallel or series parallel arrangement, rather than the pure series connections of the simple gear trains. 3) Reverted gear train. If the axes of input gear and output gear in a compound gear train are coincident, this is cal
3、led a reverted gear train, as shown in Fig 8- 2c.。,Fig.8-2 Classification of ordinary gear trains (定轴轮系分类),2.Epicyclic Gear Trains,A gear train having a relative motion of axes is called a epicyclic gear train or planetary gear train, as shown in Fig 8-3a. If the axes of the gears in an epicyclic gear train are fixed, these gears are called sun gears or central gears, such as gears 1 and 3 in Fig 8-3a, denoted as K. The gear whose axis rotates about the axes of the sun gears is the planet gear,
4、such as gear 2. The link which is pivoted to the frame at point O and carries the planet gear 2 to maintain gears 1, 2 and 3 in mesh is the arm or planet carrier, denoted as H.,Fig.8-3 Epicyclic gear train (周转轮系),3.Combined Gear Trains,Fig.8-4 Combined gear trains (混合轮系),Quite often a gear train may contain the combination of ordinary gear trains and epicyclic gear trains or some planetary gear trains. Fig 8-4a shows a gear train which consists of an ordinary gear train and a planetary gear trai
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