Cryocooler Displacer-Shaft Buffer to Reduce Vibration and Rattling

The buffer is constructed as a composite structure with both a soft material portion and a hard material portion. The soft material (e.g., rubber or resin) provides vibration absorption through elasticity, while the hard material (e.g., metal or hard resin) provides structural support and distributes tightening force uniformly. This composite approach allows the buffer to reduce vibration effectively without the soft material deforming locally, resolving the contradiction between vibration reduction and material stability.

The buffer acts as an intermediary component inserted into the clearance between the collar portion and the lid or main body portion. This intermediary element fills the gap to eliminate rattling and vibration during operation, while still allowing for relatively simple assembly. The buffer's design enables it to be installed in the clearance space without requiring complex manufacturing processes, thus resolving the contradiction between ease of assembly and vibration reduction.

The buffer employs a composite structure with distinct soft and hard material portions, each serving specific functions. The soft material portion absorbs vibrations through elastic deformation, while the hard material portion maintains structural integrity and distributes tightening force uniformly to prevent local deformation. This composite design ensures reliable connection stability while remaining manufacturable through conventional processes such as molding or machining, resolving the contradiction between manufacturing simplicity and connection reliability.