The mechanism of connecting rod - crank is a mechanism that transforms a circular motion to a translational motion (or vice versa) . The most common current example is in the internal combustion engine of a car, in which the linear motion of piston produced by the gas explosion is transmitted to the crank and becomes circular motion in the crankshaft .
Schematically, this mechanism is created with two "bars" joined by a union revoluta. One end of the rotating bar (handle) is attached to a fixed point, the center of rotation, and the other end is attached to the rod. The remaining end of the rod is attached to a piston that moves in a straight line.
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