The Four Bar Mechanism 

• A four-link mechanism with four revolute joints is commonly called a four-bar mechanism.

• Grashof's Law: A four-bar mechanism has at least one revolving link if the sum of the lengths of the largest and the shortest is less than the sum of the other two links.
  • a = Shortest link
  • c = Longest link
  • a+c < b+d

Here,

    a+c = 40+90 = 130

    b+d = 70+70 = 140

    a+c < b+d 

    ⇒ At least one of the link can turn 360°

Creating Four-Bar Mechanism on the 3DEXPERIENCE Platform:

Nomenclature:

• Fixed Link: The link fixed to ground.
• Crank: A link which rotates a full circle.
• Rocker: A link which oscillate.

Inversion of Mechanism:

Different mechanism obtained by fixing different links of a chain.

1. Crank-Crank Mechanism: Shortest-link is fixed
2. Crank-Rocker Mechanism: One link adjacent to shortest link is fixed
3. Crank-Rocker Mechanism: Another one link adjacent to shortest link is fixed
4. Rocker-Rocker Mechanism: Longest link is fixed

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Courses Preferred:

 xDesign: Perform as a 3D Creator

Kinematic Analysis: Explore the Mechanical Motion Designer Role

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Mechanism Monday - Control Gravity?! Yes you can!

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