Basic Structure

A figure to the right shows a schematic view of the Mini-Ecoboy. It was a gamma type, in which a displacer and a power piston were located in a line. A regenerator was located in the displacer. These configurations contribute to make the engine smaller. The basic structure of the Mini-Ecoboy was based on that of a 100 W class Stirling engine, named Ecoboy-SCM81 formerly developed by us and others.

In order to get a smaller size and low production cost, a simple moving-tube-type heat exchanger was adopted. As a piston drive mechanism, a Rhombic mechanism was adopted, because it gives an excellent momentum balance.