Inversion of Mechanisms: Theory of Machines With Videos
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The document outlines various mechanisms in machinery, focusing on kinematic pairs and types of linkages such as the four-bar mechanism and slider-crank mechanism. It explains the Grashof condition for four-bar linkages, which determines the mobility of the shortest link in relation to the longest link and other components. Additionally, it discusses multiple inversions of various mechanisms and their applications, including pantographs and quick return mechanisms.
Inversion of Mechanisms: Theory of Machines With Videos
- 1. Mechanics of Machinery Naseel Ibnu Azeez Assistant Professor, ME MIT-Anjarakandy naseel@mitkannur.ac.in
- 2. Link Kinematic Pair Linkage Mechanism 4-Bar Mechanism Slider-Crank Mechanism Double Slider-Crank
- 4. Grashof condition The Grashof condition for a four-bar linkage states: If the sum of the shortest and longest link of a planar quadrilateral linkage is less than or equal to the sum of the remaining two links, then the shortest link can rotate fully with respect to a neighbouring link. In other words, the condition is satisfied if S+L ≤ P+Q where S is the shortest link, L is the longest P and Q are the other links.
- 5. Parallelogram 4-Bar Mechanism First Inversion
- 7. Watt Mechanism The central moving point of the linkage is constrained to travel on an approximation to a straight line. Third Inversion
- 8. Pantographs A pantograph is a mechanical linkage connected in a manner based on parallelograms so that the movement of one pen, in tracing an image, produces identical movements in a second pen. Fourth Inversion
- 10. First Inversion Reciprocating Engine or Compressor
- 12. Third Inversion a) Cylinder Engine
- 13. b)Crank and Slotted lever Quick Return Mechanism
- 14. Fourth Inversion a) Whitworth Quick Return Mechanism
- 15. b) Rotary Engine or Gnome
- 18. Second Inversion Scotch Yoke Mechanism
- 20. 4 Bar Mechanism Slider-Crank Mechanism Double-Slider Crank 1st 2nd 3rd 4th Parallelogram Mechanism Beam Engine Pantograph Watt Mechanism 1st 2nd 3rd 4th Piston-Cylinder System Hand Pump Cylinder Engine & Quick Return Mechanism Whitworth Quick Return Mechanism & Rotary Engine 1st 2nd 3rd Elliptical Trammel Scotch-Yoke Mechanism Oldham’s Coupling