| 摘要 |
<p>A fuel pump (4) for a direct injection system provided with a common rail (3); the fuel pump (4) presents: a pumping chamber (14); a piston (15) which is mounted in a sliding manner inside the pumping chamber (14); a suction channel (17) connected to the pumping chamber (14) and regulated by a suction valve (18); a delivery channel (19) connected to the pumping chamber (14) and regulated by a delivery valve (20); and a flow rate adjustment device (6) which is mechanically coupled to the suction valve (18) for keeping, when necessary, the suction valve (18) open during a pumping step of the piston (15) and presents a control rod (21) coupled to the suction valve (18) and an electromagnetic actuator (22) which acts on the control rod (21); wherein the electromagnetic actuator (22) presents a one-way hydraulic brake (28), which is integral with the control rod (21) and slows down the movement of the control rod (21).</p> |
