Mécanismes à barres trajectoires et conception.pdf

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Basic Construction

Final Linkage

Problem 6.3:
In a back hoe, a four-bar linkage is added at the bucket in part to amplify the motion that can be
achieved by the hydraulic cylinder attached to the link that rotates the bucket as shown in the figure.
Design the link attached to the bucket and the coupler if the frame link is 13-in and the input link is
12-in long. The input link driven by the hydraulic cylinder rotates through an angle of 80˚ and the
output link rotates through an angle of 120˚. From the figure, determine reasonable angles for the
starting angles ( 0 and 0 ) for both of the rockers.

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