Model: E05 Eccentric Slider Crank Mechanism

The slider-crank is a basic mechanism to convert circular motion into oscillating linear motion or vice versa. The eccentric-slider is a topological cousin to the slider-crank in that it has four links, one sliding joint and three cylindrical joints. In the E series of models, Reuleaux created seven variations of this kinematic circuit by changing the ratio of the diameter of the cylindrical joints to the lengths of the links. Reuleaux called this variation “pin expansion.” Model E-5 is a variation of models E-6 and E-7. The small cylindrical joint seen in the black iron annulus is moved in a small circle through a disc behind the slider. Thus, the annulus acts as the connecting link. The small cylindrical pair joins the connecting link to the crank link. Since the annulus only moves through a small arc of a circle, its form does not have to be a complete circle. This has been exploited in a curved double-slider crank as in model D-7. Eccentrics were often used in steam engine control linkage.

Francis Moon 2003-07-01

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