Mechanisms

1 . Linkages

• Linkage Mechanism :

Linkage mechanism are formed when rigid bodies calls links are joined together to have relative motion between each other using pin joints (hinges), sliding joints , or balls-and-socket joints so as to form a closed chain or a series of closed chains.                                                                             

• Components using in linkage mechanism :

1. solids links

2. joints

3. pivots

• The real life application of linkage mechanism :

1. Automotive : linkage are used to steering mechanism , suspension system.

2. Aerospace : linkage are used in aircraft control surface , landing system.

3. Industrial machinery : linkage are used in machines.

4. Robotics : robotics arms .

5. Every items : foldout chairs , umbrellas, cars , cycles, ironing boards.

2 . Simulation of linkage mechanism 

• Four Bar mechanism :

• Components using in 4bar mechanism :

1. Anchor with link = Add link with anchor & connector.

2. Link = Add a link with two connector.

3. Input with link = Add a link a rotating input anchor & a connector. OR 

4. Crank , Frame , Coupler .

• 4bar mechanism is a mechanical linkage that consist of four rigid bars connected by joints to form a closed loop.

• Some examples of applications :

1. Pump jacks 

2. Door closer 

3. Valve gears

4. Car suspensions

5. Parrotfish jaws

The four bar linkage mechanism is a one degree-of-freedom linkage . The link a is the driving link & therefore the revolute joint connecting it to the base link is selected as the active kinematic pair .

• Principle of 4bar chain :

If the sum of the shortest & longest link of a planar quadrilateral linkage is less then or equal to the sum of the remaining two links. The shortest link can rotate fully with respect to a neighboring link.

• Crank slider mechanisms :

A crank slider mechanism is a mechanical arrangement that converts rotary motion into reciprocating linear motion or vice verse .

• It's made up of four parts :

      Crank , Slider , Connecting rod , Fixed frame . 

• It's crank slider mechanism is used in many application : Internal combustion engines , robots, Reciprocating piston pumps.

• It's depends on five parameters : Length , Mass , damping , external piston force , frequency .

3 . Slider crank mechanism