COOLING UNIT FOR

Disclosed is a cooling unit for a stirling cryocooler. According to an embodiment of the present invention, the cooling unit for a stirling cryocooler is capable of preventing the housing of a compression part and a piston from being overheated by high heat generated in the case of the isothermal compression of a working fluid. The stirling cryocooler comprises: the compression part operated by receiving a driving force from the engine of a vehicle through a pulley, having the working fluid filling the inside thereof, and compressing the working fluid by the reciprocation of the piston; an expansion part expanding the working fluid, which was compressed by the compression part, by the reciprocation of the piston; and a regeneration part allowing the compression part and the expansion part to communicate with each other fluidly, wherein the compression part generates the heat and the expansion part absorbs the heat through the repetition of the isothermal compression, the constant-volume process, and the isothermal expansion of the working fluid. The cooling unit for the stirling cryocooler includes: a rotary fan positioned between the pulley and the housing of the compression part, mounted on the pulley, and supplying air to the housing by generating the flow of the air when the pulley is rotated; and at least one heat radiation fin mounted on the housing, and increasing the heat transfer area of the housing when cooling the housing through the air supplied through the rotary fan.