Model: E04 Eccentric-Slider 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.” In model E-4, there is an eccentric disc behind the back iron disc in the photo that acts as the crank. The outer cylinder of the connecting link-slider joint is attached to the sliding link and its diameter is greater than the length of the connecting link. The small cylindrical joint shown in the black disc is the connecting link-crank joint. Eccentrics were used extensively in steam engine control valve linkage.
Francis Moon 2004-07-00
- Reuleaux, Kennedy : Kinematics of Machinery (§71, Figure 236, p. 308, 1876)
- Tutorials and Descriptions : Mathematics of the Slider Cranks