Method for producing a trailing arm of a twist beam axle in which a drive unit of an electrical drive close to the wheel, comprising an electrical engine and a transmission, is integrated

A method of producing a trailing arm of a torsion beam axle of a vehicle such that the trailing arm accommodates an integrated drive unit comprising an electric machine and a transmission, adjacent to a wheel of the vehicle, and the trailing arm comprising an area that accommodates the transmission, an area that accommodates the electric machine, a connection point for connecting the trailing arm to a body of the vehicle, a bore for receiving an end of a cross-member of the torsion beam axle, and a U-profile, the method comprising the steps of:

• producing the trailing arm as a casting with a box profile;
• modeling, with a first core, a contour for producing the area that accommodates the transmission;
• modeling, with a second core, a contour for producing the box profile of the trailing arm;
• modeling, with a third core, a contour for producing the area that accommodates the electric machine;
• modeling, with a fourth core, contours for producing:
• the connection point for connecting the trailing arm to the body of the vehicle, and
• the bore that receives the end of the cross-member of the torsion beam axle, and the U-profile of the trailing arm;
• and
• producing the trailing arm by casting.