Eccentric Slider Crank Mechanism
- Title:
- Eccentric Slider Crank Mechanism
- Title (German):
- Rotierende Schubkurbel, Erweiterung 2 in 1
- Collection:
- Reuleaux Kinematic Mechanisms Collection
- Set:
- E. Excentric Slider Cranks
- Designer:
- Reuleaux, F. (Franz), 1829-1905
- Manufacturer:
- Gustav Voigt Werkstatt
- Date:
- 1882
- Country:
- Germany
- Voigt Catalog Model:
- E1
- File Name:
- E01.jpg
- Work Type:
- Mechanical model
- Materials/Techniques:
- cast iron and brass on wood pedestal
- Subject:
- Kinematics of Machinery
- Measurement:
- 200 x 87 (millimeters, width x depth)
261 x 87 x 173 (millimeters, width x depth x height) - Description:
- The classic slider-crank is a mechanism that converts circular motion into oscillating linear motion. 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 the usual slider crank, the diameter of the cylindrical joint for the crank is smaller than the length of the crank. However, in model E-1, the outer bearing of the cylindrical joint fixed to the fixed link is made larger than the length of what would be the crank. Thus the connecting link-crank is contained within the crank pin. The rotary motion is affected through the motion of the black iron disc in the fixed brass bearing. The distance of the connecting link joint from the center of the rotating plate is the effective length of the crank. Excentrics were used extensively in steam engine control linkage. [Francis Moon 2003-07-01]
The 220 models in Cornell University’s Reuleaux Collection were built in the late 19th century to demonstrate the elements of machine motion, as theorized by the German engineer Franz Reuleaux. The University acquired the models in 1882 for use in teaching and research. The Reuleaux models are classified according to the alphanumeric schema employed in the catalog of the manufacturer, Gustav Voigt. The letter in a model's ID (e.g., B14 or S35) refers to a class of mechanism; the number is a specific instance of the class. This classification scheme is a simplified version of the taxonomy of machine elements elaborated in Reuleaux's work. - Repository:
- Sibley School of Mechanical and Aerospace Engineering, Cornell University
- Format:
- Image
- Rights:
- Photography credit: Jon Reis (www.jonreis.com). Jon Reis Photography grants Cornell University Libraries and the Cornell College of Engineering the rights to display copyrighted images of the Reuleux collection of kinetic machines on the Cornell University and National Science Digital Library web sites and for unlimited use in Cornell University Library publications for education purposes only. Rights for all other uses, including but not limited to, editorial, commercial, advertising, web use and display by third parties not affiliated with Cornell University are reserved by the photographer. The written permission of any copyright and other rights holders is required for distribution, reproduction, or other use that extends beyond what is authorized by fair use and other statutory exemptions. Responsibility for making an independent legal assessment of an item and securing any necessary permissions ultimately rests with persons desiring to use the item. For questions about this item or other items please contact the Physical Sciences Librarians at pslref@cornell.edu.