Refrigerating machine using the stirling cycle

A cooler machine using the Stirling cycle and comprising:

• at least one compressor with a compressor piston movable in a compression cyclinder;
• a regenerator with a regenerator piston movable in a regeneration cyclinder placed at a given angle relative to the compression cylinder;
• a rotary drive crank;
• and
• two connecting rods, respectively a compressor connecting rod coupled to the compressor piston, and a regenerator connecting rod coupled to the regenerator piston, and both coupled to the crank with a mutual angular offset;
• wherein at least one of the compressor and regenerator connecting rods is arranged to be of length that is variable over a rotation of the crank so that the movement of the corresponding piston is at least slowed down on passing through its top and/or bottom dead center, whereby the operating cycle of the machine is moved closer to the theoretical Stirling cycle than is the case for cooler machines having rigid connecting rods as made in the past.