MACHINED SPRING WITH INTEGRAL RETAINER FOR CLOSED CYCLE CRYOGENIC COOLERS

摘要

A retainer and spring with threaded end are machined from a single piece of material for threading to a piston in a closed cycle cryogenic cooler. Since the machined retainer and spring are a unitary part, they cannot rub against each other during operation of the piston which reduces debris generation. The spring is preferably formed as a double start helix which further increases axial stability and reduces side loading. The spring extends into an integrally formed, threaded end at the end thereof opposite the retainer. The spring is therefore solidly connected to its adjoining parts which greatly reduces tilting and off- axis movements inherent in the prior art, wound spring designs.