Fuel pump for a direct injection system

A fuel pump (1) for a direct injection system and comprising:

• a main body (2);
• a pumping chamber (4) defined in the main body (2);
• a piston (5), which is mounted in a sliding manner on the inside of the pumping chamber (4) so as to cyclically vary the volume of the pumping chamber (4);
• an intake duct (7), which ends in the pumping chamber (4);
• an intake valve (8), which is arranged along the intake duct (7);
• and
• a flow rate adjustment device (10) provided with a control rod (11), which is coupled to the intake valve (8), and with an electromagnetic actuator (12), which is configured to axially move the control rod (11);
• wherein the flow rate adjustment device (10) comprises a containing element (19), which houses the electromagnetic actuator (12), has an open end (21) facing the intake valve (8), and is connected to the main body (2) by means of an annular weld (22);
• wherein the containing element (19) comprises a first cylindrical wall (24) inside which the electromagnetic actuator (12) is arranged, which is in direct contact with the first cylindrical wall (24);
• wherein the containing element (19) comprises a second cylindrical wall (25), which is coaxial to the first cylindrical wall (24), has a diameter greater than a diameter of the first cylindrical wall (24), is arranged around the first cylindrical wall (24) at a non-null distance from the first cylindrical wall (24), and is connected to the first cylindrical wall (24) by means of a discoidal wall (26) having an outer circular rim integral with the second cylindrical wall (25) and an inner circular rim integral with the first cylindrical wall (24);
• and
• wherein the annular weld (22) is obtained between the main body (2) and the second cylindrical wall (25) of the containing element (19).