Model: V07 Belt and Pulley Drive Between Two Non-parallel Axes
This model demonstrates how to transmit motion from one axis of rotation to another non-parallel axis of rotation in the same plane. The mechanism uses intermediate pulley wheels on a vertical axis perpendicular to the plane of the other two axes. Reuleaux called these devices 'tension organs'. Belt and pulley systems were used extensively in 19th and early 20th century factories to distribute power from a centralized steam or large electric motor to work stations throughout the factory. Today cable-pulley systems are found in cable-car and ski-lift operations in mountainous areas especially in Alpine Europe.

A special feature of the belt and pulley mechanism is the self-centering property of the belt to remain on the pulley without side plate guides. This is accomplished by designing the pulley wheel to have crowned surface such that the belt will always move to the larger diameter in the center of the pulley when the belt is moving. Model V-2, is especially useful in demonstrating this principal.

Francis Moon 2003-07-01

Reference :

  • Reuleaux : Constructor (4th Edition Chapter XX §276, Fig. 848, p. 187, 1893)