What is a machine?

A machine is a device that transmits force or directs its applications.

In Kinematics, a machine can be further simplified into Links, joints, pairs, etc

What is a Kinematic link?

A kinematic link is just a part of a machine, which moves relative to another part of a machine.

Kinematic link can be also be called simply as a link.

This is one way of explaining a link.

To explain in a simple way, a link is a rigid body with two or more pairing elements and connects with other bodies for the purpose of transmitting force or motion.

What are the conditions for a link?

A mechanical part is considered a link only when it satisfies some conditions. Let’s have a look at the conditions below:

  • The link should have a relative motion and,
  • The link should be a resistant body independent of whether it is a rigid body or not

Various types of links:

The various types of Kinematic links are:

  • Rigid link
  • Flexible link
  • Fluid link

Examples of kinematic links:

Crankshaft and Piston on CAD

Image Credits: Wikimedia


The most commonly used example is the Piston and crankshaft.

In the above example, the piston and piston rod forms one link and the crankshaft forms another link.


Let me know in the comments section if you find this post useful. I welcome comments and suggestions. I would be glad to add few more examples that you offer in the comments section.

Pin It on Pinterest