Damped displacer refrigerating machine

In a refrigerating machine having a hollow space with at least one substantially-closed end and a displacer across the hollow space and reciprocable toward and away from the substantially-closed end of the hollow space, the improvement comprising:

• a corrugated spring in the hollow space between the substantially-closed end of the hollow space and the displacer, the spring having spring action in the direction of displacer reciprocation and a maximum dimension which is less than the maximum distance from the substantially-closed end of the hollow space to which the displacer reciprocates and greater than the minimum distance from the substantially-closed end of the hollow space to which the displacer reciprocates, whereby to damp noise and vibration which would occur if the displacer contacted the substantially-closed end of the hollow space undamped as the spring is compressed while therebefore avoiding interference with the thermodynamic cycle produced by the displacer for the refrigerating operation of the machine.