Four Bar Chain - Revision history

DT Online at 13:55, 28 August 2016

2016-08-28T13:55:39Z

← Older revision		Revision as of 13:55, 28 August 2016
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	\| [https://youtu.be/QGKnTEqHSS8 '''Four-bar linkage crane'''] - the end point of the connecting rod draws a straight line. This is used for moving loads in a horizontal direction.		\| [https://youtu.be/QGKnTEqHSS8 '''Four-bar linkage crane'''] - the end point of the connecting rod draws a straight line. This is used for moving loads in a horizontal direction.
	\| {{#ev:youtube\|QGKnTEqHSS8\|200x200\|right\|\|frame\|loop=1&autoplay=1&playlist=QGKnTEqHSS8}}		\| {{#ev:youtube\|QGKnTEqHSS8\|200x200\|right\|\|frame\|loop=1&autoplay=0&playlist=QGKnTEqHSS8}}
	\| [https://youtu.be/ADofvwxYImA '''Four-bar linkage'''] - the output oscillating angle is larger than 180 deg. which is hard to get by using an ordinary 4-bar linkage. It happens because the sum of the lengths of the two adjacent links is equal to the sum of the lengths of the other two links ''(i.e. pink input crank + con-rod = green output crank + distance between centres)''. The inertia of the green crank must be big enough to overcome the dead position when green crank and yellow con-rod are in line.		\| [https://youtu.be/ADofvwxYImA '''Four-bar linkage'''] - the output oscillating angle is larger than 180 deg. which is hard to get by using an ordinary 4-bar linkage. It happens because the sum of the lengths of the two adjacent links is equal to the sum of the lengths of the other two links ''(i.e. pink input crank + con-rod = green output crank + distance between centres)''. The inertia of the green crank must be big enough to overcome the dead position when green crank and yellow con-rod are in line.
	\| {{#ev:youtube\|ADofvwxYImA\|200x200\|right\|\|frame\|loop=1&autoplay=1&playlist=ADofvwxYImA}}		\| {{#ev:youtube\|ADofvwxYImA\|200x200\|right\|\|frame\|loop=1&autoplay=0&playlist=ADofvwxYImA}}
	\|-		\|-
	\| [https://youtu.be/Aqg7tl4jfe8 '''Four-bar linkage'''] - the green output crank rotates irregularly because the sum of the lengths of the two opposite links is equal to the sum of the lengths of the other two links.''(i.e. input crank + output crank = con-rod length + distance between centres)''. The inertia of the green crank must be big enough to overcome the dead position when green crank and yellow conrod are in line.		\| [https://youtu.be/Aqg7tl4jfe8 '''Four-bar linkage'''] - the green output crank rotates irregularly because the sum of the lengths of the two opposite links is equal to the sum of the lengths of the other two links.''(i.e. input crank + output crank = con-rod length + distance between centres)''. The inertia of the green crank must be big enough to overcome the dead position when green crank and yellow conrod are in line.
	\| {{#ev:youtube\|Aqg7tl4jfe8\|200x200\|right\|\|frame\|loop=1&autoplay=1&playlist=Aqg7tl4jfe8}}		\| {{#ev:youtube\|Aqg7tl4jfe8\|200x200\|right\|\|frame\|loop=1&autoplay=0&playlist=Aqg7tl4jfe8}}
	\| [https://youtu.be/TAPhhX3ti8s '''Four-bar toggle linkage'''] - the pink crank rotates at constant velocity while orange crank moves slowly at the beginning and end of the stroke. It moves rapidly at the midstroke when the orange crank and the green conrod are in toggle. The accelerated weight on the orange crank absorbs energy and returns it to the system when it slows down.		\| [https://youtu.be/TAPhhX3ti8s '''Four-bar toggle linkage'''] - the pink crank rotates at constant velocity while orange crank moves slowly at the beginning and end of the stroke. It moves rapidly at the midstroke when the orange crank and the green conrod are in toggle. The accelerated weight on the orange crank absorbs energy and returns it to the system when it slows down.
	\| {{#ev:youtube\|TAPhhX3ti8s\|200x200\|right\|\|frame\|loop=1&autoplay=1&playlist=TAPhhX3ti8s}}		\| {{#ev:youtube\|TAPhhX3ti8s\|200x200\|right\|\|frame\|loop=1&autoplay=0&playlist=TAPhhX3ti8s}}
	\|}		\|}

DT Online: Changed Template

2016-08-27T09:33:53Z

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← Older revision		Revision as of 09:33, 27 August 2016
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	{{~~Construction Kits~~ Buyers Guide}}		{{Mechanisms Buyers Guide}}

DT Online: Added animations

2016-08-27T09:31:04Z

Added animations

← Older revision		Revision as of 09:31, 27 August 2016
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	=====Description=====		=====Description=====

	A [http://en.wikipedia.org/wiki/Four-bar_linkage '''Four Bar Chain'''] is a '''[[:Category:Linkages\|linkage]]''' with four pivots, two of which are fixed - the bed or surface they are fixed to may be regarded as the fourth bar or link.		A [http://en.wikipedia.org/wiki/Four-bar_linkage '''Four Bar Chain'''] is a '''[[:Category:Linkages\|linkage]]''' with four pivots, two of which are fixed - the bed or surface they are fixed to may be regarded as the fourth bar or link.


	=====Features and Uses=====		=====Features and Uses=====
	Varying the lengths of the links can cause the output to speed up or slow down and describe a different arc to the input. The lengths of links can be arranged such that a continuous '''~~rotary motion~~''' input can result in an output with '''~~oscillatory motion~~'''.
			Varying the lengths of the links can cause the output to speed up or slow down and describe a different arc to the input. The lengths of links can be arranged such that a continuous '''[[Types of Motion\|Rotary Motion]]''' input can result in an output with '''[[Types of Motion\|Oscillatory Motion]]'''.


	Examples of the use of 4 Bar Chains can be found in vehicle [http://en.wikipedia.org/wiki/Double_wishbone_suspension suspension] and [https://en.wikipedia.org/wiki/Ackermann_steering_geometry steering] systems.		Examples of the use of 4 Bar Chains can be found in vehicle [http://en.wikipedia.org/wiki/Double_wishbone_suspension suspension] and [https://en.wikipedia.org/wiki/Ackermann_steering_geometry steering] systems.


			=====Animations=====

			* Examples from '''[[2100 Animated Mechanical Mechanisms\|Nguyen Duc Thang's]]''' YouTube Channel '''[[2100 Animated Mechanical Mechanisms]]'''

			{\|
			\|-
			\| [https://youtu.be/QGKnTEqHSS8 '''Four-bar linkage crane'''] - the end point of the connecting rod draws a straight line. This is used for moving loads in a horizontal direction.
			\| {{#ev:youtube\|QGKnTEqHSS8\|200x200\|right\|\|frame\|loop=1&autoplay=1&playlist=QGKnTEqHSS8}}
			\| [https://youtu.be/ADofvwxYImA '''Four-bar linkage'''] - the output oscillating angle is larger than 180 deg. which is hard to get by using an ordinary 4-bar linkage. It happens because the sum of the lengths of the two adjacent links is equal to the sum of the lengths of the other two links ''(i.e. pink input crank + con-rod = green output crank + distance between centres)''. The inertia of the green crank must be big enough to overcome the dead position when green crank and yellow con-rod are in line.
			\| {{#ev:youtube\|ADofvwxYImA\|200x200\|right\|\|frame\|loop=1&autoplay=1&playlist=ADofvwxYImA}}
			\|-
			\| [https://youtu.be/Aqg7tl4jfe8 '''Four-bar linkage'''] - the green output crank rotates irregularly because the sum of the lengths of the two opposite links is equal to the sum of the lengths of the other two links.''(i.e. input crank + output crank = con-rod length + distance between centres)''. The inertia of the green crank must be big enough to overcome the dead position when green crank and yellow conrod are in line.
			\| {{#ev:youtube\|Aqg7tl4jfe8\|200x200\|right\|\|frame\|loop=1&autoplay=1&playlist=Aqg7tl4jfe8}}
			\| [https://youtu.be/TAPhhX3ti8s '''Four-bar toggle linkage'''] - the pink crank rotates at constant velocity while orange crank moves slowly at the beginning and end of the stroke. It moves rapidly at the midstroke when the orange crank and the green conrod are in toggle. The accelerated weight on the orange crank absorbs energy and returns it to the system when it slows down.
			\| {{#ev:youtube\|TAPhhX3ti8s\|200x200\|right\|\|frame\|loop=1&autoplay=1&playlist=TAPhhX3ti8s}}
			\|}

	{{Construction Kits Buyers Guide}}		{{Construction Kits Buyers Guide}}

DT Online: Added Template

2016-06-01T08:43:14Z

Added Template

← Older revision		Revision as of 08:43, 1 June 2016
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	[[File:FourBarChain.png\|~~250px~~\|right]]		[[File:FourBarChain.png\|300px\|right]]
			__TOC__


			=====Description=====
	A [http://en.wikipedia.org/wiki/Four-bar_linkage '''Four Bar Chain'''] is a '''[[:Category:Linkages\|linkage]]''' with four pivots, two of which are fixed - the bed or surface they are fixed to may be regarded as the fourth bar or link.		A [http://en.wikipedia.org/wiki/Four-bar_linkage '''Four Bar Chain'''] is a '''[[:Category:Linkages\|linkage]]''' with four pivots, two of which are fixed - the bed or surface they are fixed to may be regarded as the fourth bar or link.


			=====Features and Uses=====
	Varying the lengths of the links can cause the output to speed up or slow down and describe a different arc to the input. The lengths of links can be arranged such that a continuous '''rotary motion''' input can result in an output with '''oscillatory motion'''.		Varying the lengths of the links can cause the output to speed up or slow down and describe a different arc to the input. The lengths of links can be arranged such that a continuous '''rotary motion''' input can result in an output with '''oscillatory motion'''.

	Examples of the use of 4 Bar Chains can be found in vehicle [http://en.wikipedia.org/wiki/Double_wishbone_suspension suspension] and [https://en.wikipedia.org/wiki/Ackermann_steering_geometry steering] systems.		Examples of the use of 4 Bar Chains can be found in vehicle [http://en.wikipedia.org/wiki/Double_wishbone_suspension suspension] and [https://en.wikipedia.org/wiki/Ackermann_steering_geometry steering] systems.


			{{Construction Kits Buyers Guide}}

DT Online: Changed Image

2015-02-21T18:00:43Z

Changed Image

← Older revision		Revision as of 18:00, 21 February 2015
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	[[File:~~4BarChain~~.~~jpg~~ \|250px\|right]]		[[File:FourBarChain.png\|250px\|right]]

	A [http://en.wikipedia.org/wiki/Four-bar_linkage '''Four Bar Chain'''] is a [[linkage]] with four pivots, two of which are fixed - the bed or surface they are fixed to may be regarded as the fourth bar or link.		A [http://en.wikipedia.org/wiki/Four-bar_linkage '''Four Bar Chain'''] is a '''[[:Category:Linkages\|linkage]]''' with four pivots, two of which are fixed - the bed or surface they are fixed to may be regarded as the fourth bar or link.

	Varying the lengths of the links can cause the output to speed up or slow down and describe a different arc to the input. The lengths of links can be arranged such that a continuous '''rotary motion''' input can result in an output with '''oscillatory motion'''.		Varying the lengths of the links can cause the output to speed up or slow down and describe a different arc to the input. The lengths of links can be arranged such that a continuous '''rotary motion''' input can result in an output with '''oscillatory motion'''.

DT Online at 18:37, 15 February 2015

2015-02-15T18:37:20Z

← Older revision		Revision as of 18:37, 15 February 2015
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			[[Category:Primary]]
			[[Category:Secondary]]
	[[Category:Linkages]]		[[Category:Linkages]]
	~~{{Template:Secondary Mechanisms}}~~
	~~{{Template:Primary Mechanisms}}~~

DT Online: Added links

2015-02-10T19:35:42Z

Added links

← Older revision		Revision as of 19:35, 10 February 2015
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	[[File:4BarChain.jpg \|250px\|right]]		[[File:4BarChain.jpg \|250px\|right]]

	A [http://en.wikipedia.org/wiki/Four-bar_linkage '''Four Bar Chain'''] is a linkage with four pivots, two of which are fixed - the bed or surface they are fixed to may be regarded as the fourth bar or link.		A [http://en.wikipedia.org/wiki/Four-bar_linkage '''Four Bar Chain'''] is a [[linkage]] with four pivots, two of which are fixed - the bed or surface they are fixed to may be regarded as the fourth bar or link.

			Varying the lengths of the links can cause the output to speed up or slow down and describe a different arc to the input. The lengths of links can be arranged such that a continuous '''rotary motion''' input can result in an output with '''oscillatory motion'''.

			Examples of the use of 4 Bar Chains can be found in vehicle [http://en.wikipedia.org/wiki/Double_wishbone_suspension suspension] and [https://en.wikipedia.org/wiki/Ackermann_steering_geometry steering] systems.

DT Online: Created 4 Bar Chain

2015-02-10T19:09:52Z

Created 4 Bar Chain

New page

[[File:4BarChain.jpg |250px|right]]

A [http://en.wikipedia.org/wiki/Four-bar_linkage '''Four Bar Chain'''] is a linkage with four pivots, two of which are fixed - the bed or surface they are fixed to may be regarded as the fourth bar or link.

[[Category:Linkages]]
{{Template:Secondary Mechanisms}}
{{Template:Primary Mechanisms}}