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An integral cryogenic refrigerator, or cryocooler, for cooling an electronic device to cryogenic temperature. The cryocooler has a minimum number of moving parts. A lightweight flexure links a compressor piston to a coupler which is also connected to a regenerator via a lightweight vane. An electric

An integral cryogenic refrigerator, or cryocooler, for cooling an electronic device to cryogenic temperature. The cryocooler has a minimum number of moving parts. A lightweight flexure links a compressor piston to a coupler which is also connected to a regenerator via a lightweight vane. An electric motor with an offset shaft drives the coupler via a bearing through a circular path to impart properly timed motion to the compressor piston and regenerator. This arrangement minimizes the weight and number of moving parts, resulting in maximum efficiency and operating life. Vibration transmission is minimized by mounting the device to be cooled on an end cap having a raised castlated rim. A reusable access port allows the cryocooler to be readily recharged.

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In a cryocooler, a pressurization port allowing access to a crankcase chamber which opens into a compression cylinder and an expansion cylinder and comprising: an upper threaded opening; a lower opening, coaxially positioned beneath the upper opening and having a smaller diameter than the upper open

In a cryocooler, a pressurization port allowing access to a crankcase chamber which opens into a compression cylinder and an expansion cylinder and comprising: an upper threaded opening; a lower opening, coaxially positioned beneath the upper opening and having a smaller diameter than the upper opening; and a ridge thus formed at the juncture of the upper and lower openings.