Dynamo electric machine

Claim 1

A dynamo electric machine comprising a hollow rotor shaft having an inner surface which bounds a longitudinal passageway along which cooling oil flows in use, and oil oulet means in the wall of said hollow shaft whereby oil is discharged from said passageway, said outlet means including a tubular element which extends substantially radially through the rotor shaft wall and which protrudes inwardly into said passageway from said inner surface of the shaft so as to receive oil from a region of the passageway spaced inwardly from the inner surface of the shaft, said element discharging oil at the exterior of the shaft into an annular weir member carried by and encircling the shaft and which presents an annular recess to the shaft, oil discharged from said element collecting in use, as a result of centrifugal force in said recess and when said recess is full, overflowing an edge of said recess around the recess periphery so as to be thrown by centrifugal force, onto windings of the machine encircling said shaft and disposed generally radially outwardly from said edge of the recess, said element serving at least in part as the means securing said weir member to said shaft.