Electric machine with a closed coolant circuit, in particular for driving a vehicle

An electric machine comprising:

• a housing,
• a rotor with a rotor cooling channel, and
• a stator with stator cooling channels,
• the housing having a distribution system for guiding a coolant flow from the rotor cooling channel to the stator cooling channels,
• wherein a collecting area for collecting the coolant flow exiting from the rotor cooling channel is provided, the housing further having a forwarding channel for guiding the coolant flow from the collecting area to the stator cooling channels,
• wherein a coolant inlet for guiding a coolant flow into the rotor cooling channel is provided,
• wherein the coolant inlet, the collecting area, and the forwarding channel are formed in a coolant cap which constitutes an axial end part of the housing,
• wherein the coolant cap carries a bearing for a shaft of the rotor,
• wherein the rotor cooling channel is provided within a rotor shaft,
• wherein one axial end of the rotor cooling channel is closed,
• wherein the coolant inlet is formed by a projection which extends into the rotor coolant channel,
• wherein the coolant cap comprises a central cavity in which an open axial end of the rotor shaft is arranged, the coolant cap comprising the projection and forming the collecting area, and
• wherein the coolant cap is a monolithic unitary structure.