Motor vehicle oil pump

A motor vehicle oil pump, comprising:

• a pump body;
• an external rotor having a radially internal surface forming a first plurality of lobes;
• an internal rotor having a radially external surface forming a second plurality of lobes configured to engage the first plurality of lobes of the external rotor, wherein a number of lobes of the first plurality of lobes is equal to a number of lobes of the second plurality plus one;
• a driving body rotatable with respect to the pump body about a first axis of rotation, wherein the external rotor is constrained to the driving body;
• and
• an idle shaft rotatably connected to the pump body about a second axis of rotation parallel and eccentric to the first axis of rotation, wherein:
• the external rotor is rotatable about said first axis of rotation and is configured to be rotated by the driving body;
• the driving body is configured to be rotated by a motor;
• said internal rotor is fitted onto said idle shaft for rotating about said second axis of rotation;
• said internal rotor is configured to be rotated by the external rotor;
• and
• said driving body comprises a base wall and a side wall extending axially away from the base wall for defining an internal cavity of the driving body, said external rotor being inserted into said internal cavity and being constrained to said side wall.