Elemen Mesin I TKM4113anamesin.lecture.ub.ac.id/files/2016/02/8-Chain-Drives.pdf · 2017-06-09 ·...
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Transcript of Elemen Mesin I TKM4113anamesin.lecture.ub.ac.id/files/2016/02/8-Chain-Drives.pdf · 2017-06-09 ·...
![Page 1: Elemen Mesin I TKM4113anamesin.lecture.ub.ac.id/files/2016/02/8-Chain-Drives.pdf · 2017-06-09 · and power from one shaft to another, when the ... diameter of the circle on which](https://reader031.fdocuments.in/reader031/viewer/2022020319/5c79f14109d3f2c9138b4be5/html5/thumbnails/1.jpg)
Chain DrivesELEMEN MESIN I I
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Belt and rope drives slipping may occur To avoid slipping Chains
The chains are made up of number of rigid links which are hinged together by pin joints in order to provide the necessary flexibility for wrapping round the driving and driven wheels.
The toothed wheels Sprocket wheels (sprockets)
The sprockets and the chain Move together without slipping and ensures perfect velocity ratio.
Introduction
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Introduction
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The chains are mostly used to transmit motion and power from one shaft to another, when the centre distance between their shafts is shortsuch as in bicycles, motor cycles, agricultural machinery, conveyors, rolling mills, road rollers etc.
The chains may also be used for long centredistance of upto 8 metres.
The chains are used for velocities up to 25 m/s and for power upto 110 kW.
Introduction
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As no slip takes place during chain drive, hence perfect velocity ratio is obtained.
Since the chains are made of metal, therefore they occupy less space in width than a belt or rope drive.
It may be used for both long as well as short distances.
It gives a high transmission efficiency (upto 98 percent).
Advantages of Chain Drive over Belt or Rope Drive
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It gives less load on the shafts.
It has the ability to transmit motion to several shafts by one chain only.
It transmits more power than belts.
It permits high speed ratio of 8 to 10 in one step.
It can be operated under adverse temperature and atmospheric conditions.
Advantages of Chain Drive over Belt or Rope Drive
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The production cost of chains is relatively high.
The chain drive needs accurate mounting and careful maintenance, particularly lubrication and slack adjustment.
The chain drive has velocity fluctuations especially when unduly stretched.
Disadvantages of Chain Drive over Belt or Rope Drive
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Pitch of chain (p) The distance between the hinge centre of a link and the corresponding hinge centre of the adjacent link
Terms Used in Chain Drive
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Pitch circle diameter of chain sprocket (D) The diameter of the circle on which the hinge centresof the chain lie, when the chain is wrapped round a sprocket.
Terms Used in Chain Drive
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Relation Between Pitch and Pitch Circle Diameter
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Velocity Ratio of Chain Drives
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Length of Chain and Centre Distance
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Length of Chain and Centre Distance
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Length of Chain and Centre Distance
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Hoisting and hauling (or crane) chains
Conveyor (or tractive) chains
Power transmitting (or driving) chains
Classification of Chains
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Maximum velocity 0.25 m/s
Chain with oval links The joint of each link is welded. The sprockets which are used for this type of chain have receptacles to receive the links.
Hoisting and hauling (or crane) chains
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Chain with square links The manufacturing cost of this type of chain is less than that of chain with oval links, but in these chains, the kinking occurs easily on overloading.
Hoisting and hauling (or crane) chains
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Run at slow speeds of about 0.8 to 3 m/s
The conveyor chains are usually made of malleable cast iron
These chains do not have smooth running qualities
Conveyor (or tractive) chains
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the distance between the centres of shafts is short
These chains have provision for efficient lubrication
Block or bush chain
Power transmitting (or driving) chains
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Bush roller chain
Power transmitting (or driving) chains
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Bush roller chain A bush roller chain is extremely strong and simple
in construction. It gives good service under severe conditions.
There is a little noise with this chain which is due to impact of the rollers on the sprocket wheel teeth.
This chain may be used where there is a little lubrication.
Power transmitting (or driving) chains
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Bush roller chain When one of these chains elongates slightly due to
wear and stretching of the parts, then the extended chain is of greater pitch than the pitch of the sprocket wheel teeth.
The rollers then fit unequally into the cavities of the wheel. The result is that the total load falls on one teeth or on a few teeth. The stretching of the parts increase wear of the surfaces of the roller and of the sprocket wheel teeth.
Power transmitting (or driving) chains
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Bush roller chain When one of these chains elongates slightly due to
wear and stretching of the parts, then the extended chain is of greater pitch than the pitch of the sprocket wheel teeth.
The rollers then fit unequally into the cavities of the wheel. The result is that the total load falls on one teeth or on a few teeth. The stretching of the parts increase wear of the surfaces of the roller and of the sprocket wheel teeth.
Power transmitting (or driving) chains
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Bush roller chain These chains are available in single-row or multi-row
roller chains such as simple, duplex or triplex strands
Power transmitting (or driving) chains
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Silent chain (inverted tooth chain)
Power transmitting (or driving) chains
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Silent chain (inverted tooth chain) To produce noiseless running.
When the chain stretches and the pitch of the chain increases, the links ride on the teeth of the sprocket wheel at a slightly increased radius.
There is no relative sliding between the teeth of the inverted tooth chain and the sprocket wheel teeth.
When properly lubricated, this chain gives durable service and runs very smoothly and quietly.
Power transmitting (or driving) chains
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Silent chain (inverted tooth chain) The various types of joints used in a silent chain
Power transmitting (or driving) chains
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IS: 2403 —1991
Characteristics of Roller Chains
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Factor of Safety for Chain Drives
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Factor of Safety for Chain Drives
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Permissible Speed of Smaller Sprocket
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Power Transmitted by Chains
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Power Transmitted by Chains
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Power Transmitted by Chains
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Number of Teeth on the Smaller or Driving Sprocket or Pinion
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Number of Teeth on the Smaller or Driving Sprocket or Pinion
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Maximum Speed for Chains
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Principal Dimensions of Tooth Profile IS: 2403 – 1991
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Principal Dimensions of Tooth Profile IS: 2403 – 1991
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Principal Dimensions of Tooth Profile IS: 2403 – 1991
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Design Procedure of Chain Drive
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Design Procedure of Chain Drive
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Contoh Design a chain drive to actuate a compressor
from 15 kW electric motor running at 1000 r.p.m., the compressor speed being 350 r.p.m. The minimum centre distance is 500 mm. The compressor operates 16 hours per day. The chain tension may be adjusted by shifting the motor on slides.
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Contoh
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Contoh
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Contoh