Mechanical system forming a cam follower or a rocker arm, injection pump or valve actuator comprising such a mechanical system and method for manufacturing such a mechanical system

A mechanical system forming one of a cam follower or a rocker arm, the mechanical system comprising:

• a support element having first and second support element axial ends and a longitudinal axis, the support element having a cylindrical skirt with an internal surface defining a cavity;
• at least one tab disposed on the first support element axial end and extending radially inwardly therefrom;
• a pin extending between two opposite pin ends along a first axis;
• and
• a roller mounted on the pin, movable in rotation relative to the pin around the first axis and adapted to roll on a cam, the roller protruding from the first support element axial end;
• an insert disposed within the support element, the insert having an outer insert surface configured to slidingly abut the internal surface of the support element, the insert having a plurality of holding members supporting the two opposite pin ends such that the pin is entirely supported by the insert, the at least one tab overlaps a portion of the insert and of the pin to prevent the insert and the pin from moving linearly along the longitudinal axis past the first support element axial end;
• the internal surface of the support element further comprising at least one protrusion extending into the cavity, the at least one protrusion abutting an end of the insert to prevent the insert, and the pin supported by the insert, from moving linearly along the longitudinal axis past the at least one protrusion such that the insert is restrained between the at least one protrusion and the at least one tab;
• wherein the plurality of holding members are provided with a plurality of cut-outs having a cut-out shape complementary to a cross section shape, as taken perpendicular to the first axis, of the two opposite pin ends, for assembling the pin with the insert by a quarter-turn of the pin around the first axis,
• the cross section shape of each of the two opposite pin ends have a flat surface and an external surface, and
• a first dimension of each of the two opposite pin ends, measured perpendicularly to the flat surface, between the flat surface and the external surface, is higher than half an outer diameter of the two opposite pin ends.