belt drive 1

8/7/2019 BELT DRIVE 1

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BELT DRIVE

1.1. A belt is a looped strip of flexible material,A belt is a looped strip of flexible material,used to mechanically link two or more rotatingused to mechanically link two or more rotatingshafts.shafts.

2.2. They may be used as a source of motion, toThey may be used as a source of motion, toefficiently transmit power, or to trackefficiently transmit power, or to trackrelative movement. Belts are looped overrelative movement. Belts are looped overpulleys.pulleys.

3.3. In a two pulley system, the belt can eitherIn a two pulley system, the belt can eitherdrive the pulleys in the same direction, or thedrive the pulleys in the same direction, or thebelt may be crossed, so that the direction ofbelt may be crossed, so that the direction ofthe shafts is oppositethe shafts is opposite


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Open belt drive


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Advantages of beltdrive

They are simple. They are economical.They are simple. They are economical. Parallel shafts are not required.Parallel shafts are not required. Overload and jam protection are provided.Overload and jam protection are provided.

Noise and vibration are damped out.Noise and vibration are damped out.Machinery life is prolonged because loadMachinery life is prolonged because loadfluctuations are cushioned (shockfluctuations are cushioned (shock--absorbed).absorbed).

They are lubricationThey are lubrication--free.Theyfree.They require onlyrequire onlylow maintenance.low maintenance.

They are highly efficient (90They are highly efficient (9098%, usually98%, usually95%). Some misalignment is tolerable.95%). Some misalignment is tolerable.

They are very economical when shafts areThey are very economical when shafts areseparated by large distances.separated by large distances.


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Belts ona Yanmar 2GM20

marinedieselengine


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V BELT


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TIMING BELT


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Roller chain and sprocket


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SYNCHSYNCHRONOUS BELT

DRIVESRONOUS BELT DRIVES

SYNCHRONOUS BELT DRIVESSYNCHRONOUS BELT DRIVES


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Used when indexing, positioning or aconstant speed ratio is required.

Drive that runs without slippage(positive drive)

WhatisaSynchronous Drive?WhatisaSynchronous Drive?


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THREE CATEGORIES OFSYNCHRONOUS DRIVES:

A)Synchronous Belt Drive

B)Geardrive

C) Chaindrive

A) B)

C)


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5.2Advantages of a

Synchronous Belt Drive No lubricationrequired Clean & low maintenance Low-stretchtensilecordnearlyeliminating

theneed forre-tensioning Eliminatenoise problems of chaindrives Longlifeexpectancy when welldesigned Smoothengagement of belt with pulleyallowshighspeeds

Less weightcomparedto chainandgeardrives forsamehorsepowerrequirements

Can operatein wetenvironments


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Synchronous

beltdriveapplications

AUTOMATIC MACHINERY


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FOOD PROCESSING Bottlingmachines, pumps,

bucketelevators, beltconveyors,mixers,mills, &

meatgrinders

PETROCHEMICALINDUSTRIESAircoolers,dryers,compressors,& pumps

belt drive 1

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