COMPRESSOR OR GAS PUMP

A driving shaft carries co-axial, one another separated and eccentrically mounted antifriction bearings (4, 41) in such a manner, that at least one first bearing (4) is with its outer ring mounted with prestressing on at least one first area (5) of the first holder (6) and at the same time at least one second bearing (41) is with its outer ring mounted with prestressing on at least one second area (51) of the second holder (61). The first and the second holders (6, 61) are each other permanently joined and every first and second bearing (4, 41) is mounted on one corresponding first or second area (5, 51), parallel each other. Individual holders (6, 61) are joined with pistons (20) which are moving in cylinders (22); said cylinders (22) form one unit together with a crankcase, so called compressor body (23). Coupling elements (7) bear, with their side areas, on the outer rings of the guiding antifriction bearings (4, 41), gripping in the compressor body (23) or in its front cover.