KOM Epreparation mid1 4(units)

Mechanism 1

Rigid Link

Kinematic Link: Each resistant body in a machine which moves relative to another resistant body is called Kinematic link or element. A resistant body is which do not go under deformation while transmitting the force.

Kinematic links can be divided into three types.

1.      Rigid link- In this type of link there is no deformation while transmitting the motion. Motion between the piston and crank can be considered as a rigid link.

2.      Flexible link- In this type of link there is partial deformation while transmitting the motion. Belt drive is an example of flexible link.

3.      Fluid link- In this type of link the motion is transmitted with the help of fluid pressure. Hydraulic brake is an example of fluid link.

Kinematic pair - Wikipedia, the free encyclopedia

 

Kinematic pair:

Kinematic Pair: When the two Kinematic links are joined to have relative motion between them is known as Kinematic pair. The Kinematic pairs are classified as follows. Acc. to the nature of contact 1.      Lower pair – When the two links have surface contact between them, it is known as lower pair. 2.      Higher pair - When the two links have line or point contact between them, it is known as lower pair. Acc. to nature of relative motion 1.      Sliding pair – When one link slides relative to another link, it is known as sliding pair. 2.      Turning pair – When one link turns or revolve relative to another link, it is known as turning pair 3.      Rolling pair – When one link rolls over the other pair, it is known as rolling pair. 4.      Screw pair – If two pairs have turning as well as rolling motion between them, it is known as screw pair. 5.      Spherical pair – When a spherical link turns inside a fixed link, it is known as spherical pair. Acc. to nature of constraint 1.      Self closed pair – When the two links are joined together mechanically, it is known as self closed pair. 2.      Unclosed pair – When the two links are connected either due to gravity or by some external forces, it is known as unclosed pair.

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