Motor unit and motor unit manufacturing method

A motor unit manufacturing method comprising:

• a first step of preparing a first rotating electric machine which includes a cylindrical first stator, a first rotor disposed coaxially with the first stator, a first shaft disposed coaxially with the first rotor, and a cylindrical first casing accommodating the first stator and the first rotor, a second rotating electric machine which includes a cylindrical second stator, a second rotor disposed coaxially with the second stator, a second shaft disposed coaxially with the second rotor, and a cylindrical second casing accommodating the second stator and the second rotor, a single drive device which has a size across a peripheral surface in a diameter direction of the first rotor in the first casing and a peripheral surface in a diameter direction of the second rotor in the second casing, and a surface-matching fixing portion which is fixed by a fixing member while an axial end surface of the first casing comes into contact with an axial end surface of the second casing, and fixing the surface-matching fixing portion by the fixing member;
• and
• a second step of fixing the drive device across the peripheral surface of the first casing and the peripheral surface of the second casing after the first step,
• wherein the surface-matching fixing portion is fixed in an axial direction,
• wherein a portion facing the drive device in the peripheral surface of the first casing and the peripheral surface of the second casing has a planar flat portion extending in the axial direction, and
• wherein the motor unit manufacturing method further comprises fixing, using an orthogonal fixing portion, the drive device in a direction orthogonal to the axial direction across the peripheral surface of the first casing and the peripheral surface of the second casing.