Category:Pulleys - Revision history

DT Online: Changed Template

2016-08-05T10:22:23Z

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	{{~~Pulleys~~ Buyers Guide}}		{{Mechanisms Buyers Guide}}

	=====More about Pulleys=====		=====More about Pulleys=====

DT Online at 18:22, 4 August 2016

2016-08-04T18:22:03Z

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	{{Pulleys Buyers Guide}}		{{Pulleys Buyers Guide}}

			=====More about Pulleys=====
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	[[Category:Primary]]		[[Category:Primary]]

DT Online: Added Template

2016-08-03T18:18:01Z

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	[[File:Keilriemen-V-Belt.png\|300px\|right\|V Belt Drive\|link=https://commons.wikimedia.org/wiki/File:Keilriemen-V-Belt.png]]		[[File:Keilriemen-V-Belt.png\|300px\|right\|V Belt Drive\|link=https://commons.wikimedia.org/wiki/File:Keilriemen-V-Belt.png]]
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			=====Description=====

	[https://en.wikipedia.org/wiki/Pulley '''Pulleys'''] are used to transfer rotating motion, via a belt, from one shaft to another. Car engines for example, often use pulleys connected by a [https://en.wikipedia.org/wiki/Belt_%28mechanical%29 Fan Belt] to transmit power from the engine to the [https://en.wikipedia.org/wiki/Magneto magneto] and [https://en.wikipedia.org/wiki/Pump water pump].		[https://en.wikipedia.org/wiki/Pulley '''Pulleys'''] are used to transfer rotating motion, via a belt, from one shaft to another. Car engines for example, often use pulleys connected by a [https://en.wikipedia.org/wiki/Belt_%28mechanical%29 Fan Belt] to transmit power from the engine to the [https://en.wikipedia.org/wiki/Magneto magneto] and [https://en.wikipedia.org/wiki/Pump water pump].


			=====Features and Applications=====
	[[File:PulleyAnimation.gif\|200px\|right]][[File:Pulleys2.gif\|200px\|right]]		[[File:PulleyAnimation.gif\|200px\|right]][[File:Pulleys2.gif\|200px\|right]]
	If a pulley drives another pulley of the same diameter, then they will both rotate at the same speed. The pulley doing the driving is known as the '''Driver''' and the receiving pulley is known as the '''Driven'''. A large Driver pulley will cause a smaller Driven pulley to rotate faster and vice versa. A smaller Driver will cause the Driven to rotate more slowly but there will be an increase in its turning power or [https://en.wikipedia.org/wiki/Torque '''Torque''']		If a pulley drives another pulley of the same diameter, then they will both rotate at the same speed. The pulley doing the driving is known as the '''Driver''' and the receiving pulley is known as the '''Driven'''. A large Driver pulley will cause a smaller Driven pulley to rotate faster and vice versa. A smaller Driver will cause the Driven to rotate more slowly but there will be an increase in its turning power or [https://en.wikipedia.org/wiki/Torque '''Torque''']
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			{{Pulleys Buyers Guide}}

DT Online: Added animations

2016-04-19T09:23:25Z

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			[[File:PulleyAnimation.gif\|200px\|right]][[File:Pulleys2.gif\|200px\|right]]
	If a pulley drives another pulley of the same diameter, then they will both rotate at the same speed. The pulley doing the driving is known as the '''Driver''' and the receiving pulley is known as the '''Driven'''. A large Driver pulley will cause a smaller Driven pulley to rotate faster and vice versa. A smaller Driver will cause the Driven to rotate more slowly but there will be an increase in its turning power or [https://en.wikipedia.org/wiki/Torque '''Torque''']		If a pulley drives another pulley of the same diameter, then they will both rotate at the same speed. The pulley doing the driving is known as the '''Driver''' and the receiving pulley is known as the '''Driven'''. A large Driver pulley will cause a smaller Driven pulley to rotate faster and vice versa. A smaller Driver will cause the Driven to rotate more slowly but there will be an increase in its turning power or [https://en.wikipedia.org/wiki/Torque '''Torque''']
	~~----~~

	<span style="color: green">'''Note:'''		<span style="color: green">'''Note:'''
	The Driver and Driven pulleys both rotate in the same direction unless, as is possible with Flat or Round Belt Drives for example, the belt is given a half twist. The flexibility of some belt drives also allows the Driver shaft and Driven shaft to be in different orientations - e.g. one at right angles to another.		The '''Driver''' and '''Driven''' pulleys both rotate in the same direction unless, as is possible with '''[[Flat Belt Drive\|Flat]]''' or '''[[Round Belt Drive\|Round Belt Drives]]''' for example, the belt is given a half twist. The flexibility of some belt drives also allows the Driver shaft and Driven shaft to be in different orientations ''(e.g. one at right angles to another)''.
	</span>		</span>
	~~----~~

	Assuming the belt does not slip and there are no frictional losses, then a pulley will drive another half its size at twice the speed and so on - i.e. . the '''[[Velocity Ratio]]''' is equal to Distance Moved by Effort divided by Distance Moved by Load which is proportional to Driver Pulley Diameter divided by Driven Pulley Diameter. Similarly the '''[[Mechanical Advantage]]''', in this case the increase in Torque, can be calculated by dividing the diameter of the Driven pulley by the diameter of the Driver pulley.		Assuming the belt does not slip and there are no frictional losses, then a pulley will drive another half its size at twice the speed and so on - i.e. . the '''[[Velocity Ratio]]''' is equal to Distance Moved by Effort divided by Distance Moved by Load which is proportional to Driver Pulley Diameter divided by Driven Pulley Diameter. Similarly the '''[[Mechanical Advantage]]''', in this case the increase in Torque, can be calculated by dividing the diameter of the Driven pulley by the diameter of the Driver pulley.
	~~----~~

	<span style="color: green">'''Note:'''		<span style="color: green">'''Note:'''
	Additional pulleys may be added to the drive, e.g. to drive additional equipment, to guide the belts around obstacles or in the form of a [https://en.wikipedia.org/wiki/Derailleur_gears#Construction '''Jockey Pulley'''] to tighten belts and maintain contact with the pulleys. These extra pulleys do not affect the Mechanical Advantage or the Velocity Ratio of the system overall however ''(other than to increase frictional losses)'' and these continue to be calculated by reference only to the size of the first Driver pulley and last Driven pulley		Additional pulleys may be added to the drive, e.g. to drive additional equipment, to guide the belts around obstacles or in the form of a [https://en.wikipedia.org/wiki/Derailleur_gears#Construction '''Jockey Pulley'''] to tighten belts and maintain contact with the pulleys. These extra pulleys do not affect the Mechanical Advantage or the Velocity Ratio of the system overall however ''(other than to increase frictional losses)'' and these continue to be calculated by reference only to the size of the first Driver pulley and last Driven pulley

DT Online at 09:11, 2 March 2016

2016-03-02T09:11:25Z

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	[[File:Keilriemen-V-Belt.png\|300px\|right\|V Belt Drive\|link=https://commons.wikimedia.org/wiki/File:Keilriemen-V-Belt.png]]		[[File:Keilriemen-V-Belt.png\|300px\|right\|V Belt Drive\|link=https://commons.wikimedia.org/wiki/File:Keilriemen-V-Belt.png]]

	[https://en.wikipedia.org/wiki/Pulley '''Pulleys'''] are used to transfer rotating motion, via a belt, from one shaft to another. Car engines for example, often use pulleys connected by a Fan Belt to transmit power from the engine to the magneto and water pump.		[https://en.wikipedia.org/wiki/Pulley '''Pulleys'''] are used to transfer rotating motion, via a belt, from one shaft to another. Car engines for example, often use pulleys connected by a [https://en.wikipedia.org/wiki/Belt_%28mechanical%29 Fan Belt] to transmit power from the engine to the [https://en.wikipedia.org/wiki/Magneto magneto] and [https://en.wikipedia.org/wiki/Pump water pump].

DT Online at 12:24, 19 January 2016

2016-01-19T12:24:20Z

← Older revision		Revision as of 12:24, 19 January 2016
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	[https://en.wikipedia.org/wiki/Pulley '''Pulleys'''] are used to transfer rotating motion, via a belt, from one shaft to another. Car engines for example, often use pulleys connected by a Fan Belt to transmit power from the engine to the magneto and water pump.		[https://en.wikipedia.org/wiki/Pulley '''Pulleys'''] are used to transfer rotating motion, via a belt, from one shaft to another. Car engines for example, often use pulleys connected by a Fan Belt to transmit power from the engine to the magneto and water pump.


	If a pulley drives another pulley of the same diameter, then they will both rotate at the same speed. The pulley doing the driving is known as the '''Driver''' and the receiving pulley is known as the '''Driven'''. A large Driver pulley will cause a smaller Driven pulley to rotate faster and vice versa. A smaller Driver will cause the Driven to rotate more slowly but there will be an increase in its turning power or [https://en.wikipedia.org/wiki/Torque '''Torque''']		If a pulley drives another pulley of the same diameter, then they will both rotate at the same speed. The pulley doing the driving is known as the '''Driver''' and the receiving pulley is known as the '''Driven'''. A large Driver pulley will cause a smaller Driven pulley to rotate faster and vice versa. A smaller Driver will cause the Driven to rotate more slowly but there will be an increase in its turning power or [https://en.wikipedia.org/wiki/Torque '''Torque''']

DT Online: Added link

2016-01-19T12:23:50Z

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	[[File:Keilriemen-V-Belt.png\|300px\|right]]		[[File:Keilriemen-V-Belt.png\|300px\|right\|V Belt Drive\|link=https://commons.wikimedia.org/wiki/File:Keilriemen-V-Belt.png]]

	[https://en.wikipedia.org/wiki/Pulley '''Pulleys'''] are used to transfer rotating motion, via a belt, from one shaft to another. Car engines for example, often use pulleys connected by a Fan Belt to transmit power from the engine to the magneto and water pump.		[https://en.wikipedia.org/wiki/Pulley '''Pulleys'''] are used to transfer rotating motion, via a belt, from one shaft to another. Car engines for example, often use pulleys connected by a Fan Belt to transmit power from the engine to the magneto and water pump.

DT Online: Changed Image

2015-06-02T07:25:36Z

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	[[File:~~DrivePulleys~~.~~jpg~~\|300px\|right]]		[[File:Keilriemen-V-Belt.png\|300px\|right]]

	[https://en.wikipedia.org/wiki/Pulley '''Pulleys'''] are used to transfer rotating motion, via a belt, from one shaft to another. Car engines for example, often use pulleys connected by a Fan Belt to transmit power from the engine to the magneto and water pump.		[https://en.wikipedia.org/wiki/Pulley '''Pulleys'''] are used to transfer rotating motion, via a belt, from one shaft to another. Car engines for example, often use pulleys connected by a Fan Belt to transmit power from the engine to the magneto and water pump.

DT Online: Added category link

2015-04-30T21:45:57Z

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	[[Category:Secondary]]		[[Category:Secondary]]
	[[Category:Mechanisms]]		[[Category:Mechanisms]]
			[[Category:Materials and Components]]

DT Online at 18:10, 21 February 2015

2015-02-21T18:10:45Z

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	[[File:DrivePulleys.jpg\|~~500px~~\|right]]		[[File:DrivePulleys.jpg\|300px\|right]]

	[https://en.wikipedia.org/wiki/Pulley '''Pulleys'''] are used to transfer rotating motion, via a belt, from one shaft to another. Car engines for example, often use pulleys connected by a Fan Belt to transmit power from the engine to the magneto and water pump.		[https://en.wikipedia.org/wiki/Pulley '''Pulleys'''] are used to transfer rotating motion, via a belt, from one shaft to another. Car engines for example, often use pulleys connected by a Fan Belt to transmit power from the engine to the magneto and water pump.