Cryocooler Disassembly Method for Scotch Yoke Guide Replacement
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Solution Overview
Problem
The guide in a cryocooler, typically made of synthetic resin, undergoes significant abrasion when used with a metal scotch yoke, making it difficult to perform its guiding and rotational restriction functions effectively over time.
Innovation Solution
A method for disassembling the cryocooler involves removing the lower cover from the housing to extract the scotch yoke guide, allowing for its replacement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the scotch yoke guide is made of synthetic resin material, then the cost and weight are reduced, but the guide undergoes significant abrasion when sliding with metal scotch yoke, reducing reliability
Solution Approach 1:
The guide is divided into a guide body and separate guide pins. The guide pins are made of wear-resistant material and can be replaced independently when worn, while the guide body remains intact. This segmentation allows selective replacement of only the worn components.
Solution Approach 2:
The guide pins are made of material with different properties (higher wear resistance) than the guide body. This material parameter change in critical wear areas solves the abrasion problem while maintaining the overall benefits of using synthetic resin.
2Ease of repair
If the guide is designed to be removable for replacement, then maintenance becomes easier, but the device complexity increases
Solution Approach 1:
The guide is segmented into a guide body and removable guide pins. The guide pins are designed to be extractable through the lower opening without removing the entire guide assembly, enabling simple maintenance while keeping the overall structure relatively simple.
Solution Approach 2:
The guide pins are extracted as separate replaceable components from the guide body. This extraction design allows the pins to be removed and replaced independently through the lower opening, simplifying maintenance procedures.
Data Source
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AI summary
There is provided a method for disassembling a cryocooler including a housing (20) having a lower opening (21), a lower cover that closes the lower opening (21), a scotch yoke shaft (45) that is accommodated in the housing (20) and extends out of the housing (20) by penetrating the lower cover, and a scotch yoke guide (54) that is removably provided in the housing (20) and guides axial movement of the scotch yoke shaft (45), the method including removing the lower cover from the housing (20), and taking the scotch yoke guide (54) out of the housing (20) from the lower opening (21).