Powertrain with cycloidal mechanism having reinforced contact surfaces

A powertrain comprising:

• a traction motor including a stator, a rotor, and an output shaft fixed to the rotor;
• and
• a cycloidal speed reducer coupled to the traction motor and including
• a ring-pin assembly rotational fixed with the stator, encircling the output shaft, and having a plurality of circumferentially arranged ring pins,
• an eccentric cam received on the output shaft,
• a cycloidal disc made of a first material and defining (i) a central hole that receives the eccentric cam, (ii) a plurality of lobes circumferentially arranged about a perimeter of the cycloidal disc, and (iii) plurality of circumferentially-arranged holes extending therethrough, and
• a plurality of cylindrical inserts made of a second material and each disposed in one of the circumferentially-arranged holes.

A cycloidal disc for an electric powertrain, the cycloidal disc comprising:

• a main body made of a first material and defining
• a central hole configured to receive an eccentric cam,
• a plurality of lobes circumferentially arranged about a perimeter of the main body, and
• a plurality of circumferentially-arranged holes extending therethrough;
• a central insert made of a second material and secured to the main body in the central hole;
• a plurality of inserts made of the second material and each secured to the main body in one of the circumferentially-arranged holes;
• and
• an outer ring made of the second material and extending about the perimeter of the main body and extending over the lobes.