Abstract
The adsorption force between two objects is caused by various factors such as surface condition and static electricity. At the surface of the displacer cylinder inside of the γ type stirling engine, if an adsorption force between the cylinder and the piston is increases, the output of the engine is decrease. There is a gap between the cylinder and the piston to avoid the collision at a top or a bottom dead center. These gaps are the invalid capacities causing the output decline. If to clarify a maximum distance that an adsorption force acts on, it can design closer the gap in the displacer cylinder. This report shows experimentally the adsorption force to act on the wall surfaces such as the displacer piston and the cylinder.
