imported>AV308: Add links to "stiction" and the Stribeck curve

2025-01-22T14:57:37Z

Add links to "stiction" and the Stribeck curve

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{{Short description|Kinematic pair which constrains bodies to pure rotation about a common axis}}
{{multiple image
| width = 150
| image1 = Revolute_Pin_Joint.png
| alt1 = Revolute joint with shoulders cutaway view
| image2 = Revolute joint.svg
| alt2 = Revolute joint cutaway view
| footer = Revolute joint with and without shoulders, cutaway views
}}

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 [[Mechanism (engineering)|mechanism]]s and [[machine]]s.<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}}</ref> The joint [[Constraint (classical mechanics)|constrains]] the motion of two bodies to pure rotation along a common [[Rotation around a fixed axis|axis]]. The joint does not allow [[Sliding (motion)|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 [[hinge]]s, 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 |access-date=2009-02-04 |url-status=dead |archive-url=https://web.archive.org/web/20090311072110/http://www.robotics.utexas.edu/rrg/learn_more/low_ed/joints/ |archive-date=2009-03-11}}</ref>

A revolute joint is usually made by a [[pin]] or [[knuckle joint]], through a rotary [[Bearing (mechanical)|bearing]]. It enforces a cylindrical contact area, which makes it a [[Kinematic pair#Lower_pair|lower kinematic pair]], also called a full joint. However, If there is any [[Engineering tolerance|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>

The contact between the inner and outer cylindrical surfaces is usually assumed to be [[friction]]less. But some use simplified models assume linear [[viscous damping]] in the form <math>T=B\,\omega</math>, where {{mvar|T}} is the [[friction torque]], {{mvar|ω}} is the relative [[angular velocity]], and {{mvar|B}} is the friction constant. Some more complex models take [[stiction]] and the [[Stribeck curve|Stribeck effect]] into consideration.<ref>{{Cite web |last=Moore |first=Jacobs |title=Bearing Friction |url=http://mechanicsmap.psu.edu/websites/6_friction/bearing_friction/bearingfriction.html |access-date=June 6, 2020 |website=Mechanics Map}}</ref>
[[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}}]]

==See also==
{{div col|colwidth=23em}}
* [[Cylindrical joint]]
* [[Kinematics]]
* [[Degrees of freedom (mechanics)]]
* [[Kinematic pair]]
* [[Mechanical joint]]
* [[Prismatic joint]]
{{div col end}}

== References ==
{{reflist}}

{{Kinematic pair}}

[[Category:Kinematics]]
[[Category:Rigid bodies]]

{{classicalmechanics-stub}}

Revolute joint - Revision history

imported>AV308: Add links to "stiction" and the Stribeck curve