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The four-bar mechanism, in its simplest form, has four bar-shaped links and four turning pairs, as shown in the animation. The fixed link (the black bar) may actually be bar-shaped, but more frequently it represents the frame of a machine and in that case is usually a massive casting of irregular shape. This interesting linkage system is the building block of more complicated mechanical linkage systems. Therefore it is a fundamental concept to be learned by mechanical engineering students.
In a four-bar mechanism, one of the rotating members usually is the driver and is called the crank or driver (the red bar). The other usually is called the rocker or follower (the green bar). The floating link ( the blue bar ) that connects the crank and the rocker is called the connecting rod, and the fixed link ( the black bar ) is called the frame.
Many mechanisms can be broken down into equivalent four-bar linkages. These mechanisms have many aplications in mecanical operations. Four-bar linkages are considered one of the fundamental mechanisms.
In this animation You can move either the red or green ball for different arrangements. Now you can also change the length of linkages. Note that when the ball is moved to a point that this mechanism can't handle, the rocker and connecting rod will be separated from the crank. However, the end of the connecting rod will try to reach to the tip of the crank. This is because the connecting rod and follower use forward kinematics to reach to the tip of the crank.
Grashof's law is applied to four-bar mechanisms.
How do the components of the animation work?Add a comment or brief description of this mechanism in your language.
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