Multi-gap rotating electric machine with cooling oil guide channels for side stator coil

A multi-gap rotating electric machine comprising:

• a housing;
• a rotating shaft rotatably supported by the housing;
• an annular rotor mechanically connected to the rotating shaft so as to rotate together with the rotating shaft;
• an inner stator including an inner stator core and an inner stator coil, the inner stator core being arranged radially inside the rotor with a radially inner gap formed between the inner stator core and the rotor, the inner stator coil being wound on the inner stator core;
• an outer stator including an outer stator core and an outer stator coil, the outer stator core being arranged radially outside the rotor with a radially outer gap formed between the outer stator core and the rotor, the outer stator coil being wound on the outer stator core;
• a side stator coil arranged on one axial side of the rotor to connect the inner and outer stator coils radially across the rotor;
• a side space which is formed between axial end surfaces of the inner and outer stator cores and an interior side surface of the housing and in which the side stator coil is received;
• a cooling oil introduction passage formed in an upper part of the housing to introduce cooling oil from outside of the housing to the side space, the cooling oil introduction passage having a cooling oil inlet formed at its upper end so as to be open to the outside of the housing and a cooling oil outlet formed at its lower end so as to be open to the side space;
• and
• a cooling oil flow adjustment member provided between the interior side surface of the housing and the side stator coil to adjust flow of the cooling oil in the side space,
• wherein
• the cooling oil flow adjustment member has an uneven surface that faces the side stator coil through a cooling oil flow gap formed therebetween and includes a plurality of protrusions and a plurality of recesses,
• the protrusions and the recesses together form a plurality of cooling oil guide channels on the uneven surface of the cooling oil flow adjustment member,
• the protrusions and the recesses are formed alternately in a radial direction of the rotating shaft,
• each of the cooling oil guide channels is formed between one radially-adjacent pair of the protrusions,
• when viewed along a central axis of the rotating shaft:
• on an upper part of the uneven surface which is located above the central axis of the rotating shaft, the cooling oil guide channels spread from a reference line to both sides of the reference line while extending downward;
• and
• on a lower part of the uneven surface which is located below the central axis of the rotating shaft, the cooling oil guide channels converge on the reference line from both sides of the reference line while extending downward.