Patent ID: 7576458

Claim:
A coolable housing jacket ( 1 ) for an electric motor, which is manufactured as a cast moulded part, is formed for receiving a concentric internal rotor/stator arrangement ( 23 ) together with windings and winding overhang ( 24 ) with a through-passage ( 3 ) that is symmetrical, concentric and/or coaxial with respect to a hypothetical motor axis of rotation, and which is penetrated by one or more cooling channels ( 2 , 2 a - h ) to form a coolant circuit, characterised by (a) a coating on the jacket inner faces including the channel internal walls via a cathodic dip-varnishing process and (b) the housing jacket being an integral, one piece casting within which are the cooling channels ( 2 ) and transverse ducts ( 14 ) connecting the ends of cooling channels of adjacent quadrants wherein the cooling channels ( 2 ) end with apertures freely accessible on the outside opening onto at least a first ( 5 a ) of plural housing jacket end faces ( 5 a , 5 b ), and wherein in a second ( 5 b ) of the housing jacket end faces ( 5 a , 5 b ) the cooling channels ( 2 ) end at a housing wall formed by the one piece casting and are thus closed in a sealing-tight manner with respect to the outside and wherein the housing jacket end face ( 6 ) formed by casting and sealing the cooling channels ( 2 ) has in its cast wall one or more bores ( 15 ) or perforations.