belt drive. ppt
TRANSCRIPT
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TE- 334 : Elements of Machine dynamics and Design
Lecture: Belt Drive and Design
Toufiq RahmanDepartment of Textile Engineering
Daffodil International University
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Belt Drive !?
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Belt is a Flexible Mechanical element that transmit power from one shaft to another
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Gear Train◦ Ex: Automobile, engines etc.
Chain Drive◦ Ex : Bi-cycle , Motor cycle etc.
Belt Drive◦ Ex: Rice mills, sewing machine etc.
Rope Drive◦ Ex: lift, crane etc.
Means of power Transmission
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Amount of Power Transmitted by belt Depends on◦ The velocity of the belt◦ The Tension of the belt◦ The arc of contact between the belt and smaller
pulley◦ The condition under which the belt is used
Belt Drive and Power Transmission
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Belt Drive Selection Criteria
1.2.3.4.5.6.7.8.
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Belt Type
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According to the Material Used Belts are classified into
1. Leather Belts 2. Cotton or Fabric Belts 3. Rubber Belts 4. Balata belts
Similar to rubber belt except that balata gum is used in place of rubber
Belt Material
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Open Belt Drive: The open belt drive is used with shafts arranged parallel and rotating in the same direction
Belt Drive type
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Crossed Belt Drive: The crossed belt drive is used with shafts arranged parallel and rotating in the opposite direction
Belt Drive type
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Belt Drive with Idler pulleys: is used with shafts arranged parallel and when belt drive cannot be used due to small angle of contact on the smaller pulley.
Idler pulley is a pulley which does not transmit power but assist power transmission by increasing angle of contact of smaller pulley
Belt Drive type
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Belt Drive Type
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Stepped or Cone pulley Drive: is used for changing the speed of the driven shaft while main shaft runs at constant speed.
Belt Drive Type
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Fast and loose pulley Drive: ◦ Fast pulley: pulley
keyed to the driven shaft
◦ Loose pulley: pulley not keyed to the driven shaft. It can freely rotate
When needed belt slided over to the loose pulley. Then driven shaft can be stopped without stopping driver shaft
Belt Drive Type
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Length of Open belt drive Contact Angle
Length of belt
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Length of Crossed belt drive: Contact Angle
Length of belt
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Ratio of Driving Tensions For Flat Belt
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Ratio of Driving Tensions For Flat Belt
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Ratio of Driving Tensions For Flat Belt
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Since belt continuously runs over the pulley, therefore, some centrifugal force is caused, whose effect is to increase the tension on both, tight and slack sides, this tension caused by centrifugal force is called centrifugal tension
Centrifugal tension
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Centrifugal Tension Derivation
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Centrifugal Tension Derivation
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Relation between Maximum Tension and Strength of a belt
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Condition For Max Power Transmission
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Condition For Max Power Transmission
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Advantage of V belt over Flat Belt
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Driving Tension of V belt
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Problems
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Problems
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Problems