Chapter5Beltandchain-0417-2 - Chapter5 1 Basic features x...

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    Chapter 5 Belt drives and chain drives
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    Chapter 5      Belt drives and chain drives 1. Basic features x ° « of a belt drive system and their types 2.Principles x ° « of belts transmission 3.Design of V belt transmission 4. Structure design of pulleys and tension equipments x ° « “G of V belts 5.Introduction of chain drives
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    Objects of this chapter 1. Describe the basic features of a belt drive system and a chain drive system 2. Describe several types of belt drives and chain drives 3. Specify suitable types and sizes of belts (or chains) and pulleys to transmit a given level of power at specified speeds for the input and output sheaves .±±±
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    Advantages: (due to flexibility ¨ ° « and friction transmission properties ) 1)Good stability ¨ ° « and lower noise 2)Cushion ¨ ° « impact ¨ ° « loads 3)Being used in the long distance situation 4)Being easily manufactured and maintenance 5)Protect other elements from being broken due to extra loads 1.  Basic features of a belt drive  system and their types
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    Disadvantage: 1)Shorter allowable life 2)Axial load and system structure is larger than gears when they transmit same circumferential ² « force 3)Lower transmission efficiency and having no precision transmission ratio because of being subjected to creep .±±± Types of belt
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    Types of V belts and their characteristics . ± . ± V V V V F G³ „ “ G ± ± ´ “ — V V V V b p R V F ±± ± ± V P134 V 5-3 V V V V R V V V R , F G³ „ “ G ± ± ´ “ — V R V V V R “x ´ U C ± ± µ ± ± ± U C ± ±
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    National standard of V belt transmission GB/T 11544-1997 Classical and narrow V-belts- Dimensions ( .± V .±± V h « “G GB/T 11355-1989 V . ±± -- h « “G± ±±±±±±±± · ° ¸ ØA UC±±± ¹W “±±±±±±±±±±±± º ±±±± · ° ¸ h †«¹ “G
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     2.Principles of belts transmission 1)Forces exerted on belts Unloading Loading
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    0 2 1 2 F F F = + Efficiency force ° F e =F 1 -F 2 Transmission power .
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