Partial-opening system for a motor vehicle opening leaf

A partial-opening system for a motor vehicle opening leaf, the partial-opening system comprising an opening leaf which has a first edge adapted to be mounted pivotably on a framework of a motor vehicle, about an opening axis, and an opposed second edge which is designed to extend parallel to a central pillar of the motor vehicle, the opening leaf being moveable between at least a closed position and a partially opened position in order to allow a user to grab the second edge of the opening leaf for opening the opening leaf, the partial-opening system comprising:

• an actuator comprising a fixed frame mounted on the opening leaf and an actuating element moveable between a retracted position in which the opening leaf is in the closed position and a deployed position in which a free end of the actuating element is adapted to bear on the central pillar to partially open the opening leaf;
• and
• a retaining device comprising a retaining end-piece arranged at the free end of the actuating element of the actuator and a retaining element adapted to be mounted on the central pillar of the motor vehicle, wherein the retaining device is adapted to maintain the opening leaf in the partially opened position and release the opening leaf in a case of an opening action on the opening leaf by the user,
• wherein the actuator is an electric jack, the actuating element of the actuator forming a sliding endless screw which extends perpendicularly to the opening axis of the opening leaf,
• wherein the retaining end-piece of the retaining device is mounted so as to be free to pivot on the free end of the actuating element of the actuator only about an axis parallel to the opening axis of the opening leaf, in order to promote the connection between the retaining end-piece and an associated retaining element.