Lecture 13 Coupling Rod of Locomotive : An example of special case of Drag - link mechanism

Coupling Rod of Locomotive is an example of special case of Drag - link mechanism (Double Crank Mechanism) wherein Coupler (originally link 3 of four bar linkage/planar mechanism) and Frame (originally link 1 of four bar linkage/planar mechanism)  are of equal length in terms of dimensions. Therefore both the cranks are of equal length in Coupling rod of Locomotive.

1st link= frame = Originally the "crank"[Link 2]

2nd link = crank = Originally the "coupler"[Link 3]

3rd link = coupler = Originally the "rocker"[Link 4]

4th link = crank = Originally the "frame" [Link 1]

2nd link is Input Link and nature of Input Motion that is available of "Driving Crank" ( left side Crank with respect to frame) is Continuous Rotation at constant angular speed.

4th link is Output Link and desired Output Motion of "Driven Crank" ( right side Crank with respect to frame) is Continuous Rotation.

Note: Such special case of  "Drag link mechanism" with both 'Driving Crank' and 'Driven Crank' of equal length is known as "parallel linkage".

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