Mounting arrangement for an eccentric shaft in a refrigeration compressor

A mounting arrangement for an eccentric shaft in a refrigeration compressor of the type which includes a block (B) comprising a shaft hub having a first and a second end portion and housing an eccentric shaft which presents an eccentric end portion projecting outwardly from the first end portion of the shaft hub, a median portion radially journalled in the shaft hub, and a free end portion carrying the rotor of an electric motor, said arrangement being characterized in that the first and the second end portions of the shaft hub define respective radial bearings for the median portion of the eccentric shaft, there being provided a support member which is formed by a coupling portion, affixed to the free end portion of the eccentric shaft, and by a mounting portion projecting axially and radially outwardly from the coupling portion towards the first end portion of the shaft hub, said mounting portion being disposed externally to the shaft hub around the median portion of the eccentric shaft, the rotor being affixed to the mounting portion, concentrically to the eccentric shaft and surrounding the shaft hub.