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Piston-connecting rod assembly Disclosure Number: IPCOM000005840D
Publication Date: 2001-Nov-12

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The Prior Art Database

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Patent/Patent Application:
DE 4424672 A1


A piston - connecting rod assembly for a reciprocating CO2 -compressor is disclosed. The assembly is realized by PEEK injection moulding of a ball bearing within a recess on the rear side of the piston. Compressors using CO2 as refrigerant have to deal with considerably higher working pressures as compared to systems with standard hydrocarbon based refrigerants, resulting in increased forces per area to be handled by the bearing between piston and connecting rod. The ball bearing of the assembly is designed with a high ratio between ball diameter and piston diameter. Further, the total length of the assembly can be accurately controlled to minimize re-expansion of compressed gas caused by the dead volume within the cylinder.