Revolute joint: Difference between revisions
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[[File:Revolute joint in door handle IMG 2258c.jpg|thumb|<center>The door handle rotates an internal '''revolute joint''' to retract or release the latch bolt of the spring latch</center>]] |
[[File:Revolute joint in door handle IMG 2258c.jpg|thumb|<center>The door handle rotates an internal '''revolute joint''' to retract or release the latch bolt of the spring latch</center>]] |
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[[File:Revolute joint.svg|200px|thumb|right|Cutaway view]] |
[[File:Revolute joint.svg|200px|thumb|right|Cutaway view]] |
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A '''revolute joint''' (also called '''pin joint''' or '''hinge joint''') is a one-[[Degrees of freedom (mechanics)|degree-of-freedom]] [[kinematic pair]] used frequently in mechanisms and machines.<ref name="norton">{{cite book|last=Norton|first=Robert L.|title=Design of Machinery|publisher=McGraw Hill Higher Education|location=Boston, MA|date=2008|edition=4th|pages=33|chapter=2|isbn=978-0-07-312158-1|language=}}</ref> |
A '''revolute joint''' (also called '''pin joint''' or '''hinge joint''') is a one-[[Degrees of freedom (mechanics)|degree-of-freedom]] [[kinematic pair]] used frequently in mechanisms and machines.<ref name="norton">{{cite book|last=Norton|first=Robert L.|title=Design of Machinery|publisher=McGraw Hill Higher Education|location=Boston, MA|date=2008|edition=4th|pages=33|chapter=2|isbn=978-0-07-312158-1|language=}}</ref> The joint constrains the motion of two bodies to pure rotation along a common axis. The joint doesn't allow translation, or sliding linear motion, a constraint not shown in the diagram. Almost all assemblies of multiple moving bodies include revolute joints in their designs. Revolute joints are used in numerous applications such as door hinges, mechanisms, and other uni-axial rotation devices.<ref name="uta">{{cite web|url=http://www.robotics.utexas.edu/rrg/learn_more/low_ed/joints/|title=Joint Types|last=Robotics Research Group|publisher=University of Texas at Austin|accessdate=2009-02-04|url-status=dead|archiveurl=https://web.archive.org/web/20090311072110/http://www.robotics.utexas.edu/rrg/learn_more/low_ed/joints/|archivedate=2009-03-11}}</ref> |
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A revolute joint is usually applied by having a pin or [[knuckle joint]]. It enforces a cylinderical contact area, which makes it a lower [[kinematic pair]], also called a full joint. However, If there is any clearance between the pin and hole (as there must be for motion), so-called surface contact in the pin joint actually becomes line contact.<ref>Norton, Robert L. ''Design of machinery: an introduction to the synthesis and analysis of mechanisms and machines''. Boston: McGraw-Hill Higher Education,, 2004. p. 31.</ref> |
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The contact between the inner and outer cylinderical surfaces is usually assumed to be frictionless. But some use simplified models assume linear viscous damping in the form <math>T=B*\omega</math>, where T is the friction torque, ω is the relative angular velocity, and B is the friction constant. Some more complex models take stiction and stribeck effect into consideration.<ref>{{Cite web|last=Moore|first=Jacobs|date=|title=Bearing Friction|url=http://mechanicsmap.psu.edu/websites/6_friction/bearing_friction/bearingfriction.html|url-status=live|archive-url=|archive-date=|access-date=June 6, 2020|website=Mechanics Map}}</ref> |
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[[File:Revolute_Pin_Joint.png|thumb|Revolute pin joint cutaway]] |
[[File:Revolute_Pin_Joint.png|thumb|Revolute pin joint cutaway]] |
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Revision as of 01:10, 6 June 2020
A revolute joint (also called pin joint or hinge joint) is a one-degree-of-freedom kinematic pair used frequently in mechanisms and machines.[1] The joint constrains the motion of two bodies to pure rotation along a common axis. The joint doesn't allow translation, or sliding linear motion, a constraint not shown in the diagram. Almost all assemblies of multiple moving bodies include revolute joints in their designs. Revolute joints are used in numerous applications such as door hinges, mechanisms, and other uni-axial rotation devices.[2]
A revolute joint is usually applied by having a pin or knuckle joint. It enforces a cylinderical contact area, which makes it a lower kinematic pair, also called a full joint. However, If there is any clearance between the pin and hole (as there must be for motion), so-called surface contact in the pin joint actually becomes line contact.[3]
The contact between the inner and outer cylinderical surfaces is usually assumed to be frictionless. But some use simplified models assume linear viscous damping in the form , where T is the friction torque, ω is the relative angular velocity, and B is the friction constant. Some more complex models take stiction and stribeck effect into consideration.[4]
See also
References
- ^ Norton, Robert L. (2008). "2". Design of Machinery (4th ed.). Boston, MA: McGraw Hill Higher Education. p. 33. ISBN 978-0-07-312158-1.
- ^ Robotics Research Group. "Joint Types". University of Texas at Austin. Archived from the original on 2009-03-11. Retrieved 2009-02-04.
- ^ Norton, Robert L. Design of machinery: an introduction to the synthesis and analysis of mechanisms and machines. Boston: McGraw-Hill Higher Education,, 2004. p. 31.
- ^ Moore, Jacobs. "Bearing Friction". Mechanics Map. Retrieved June 6, 2020.
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