| 摘要 |
<p>An internal combustion engine fuel pump (4) having at least one cylinder (11), in which a variable-volume pump chamber (22) is defined; a movable piston (12) defining the bottom of the pump chamber (22); at least one intake valve (26) communicating with the pump chamber (22); at least one delivery valve (27) communicating with the pump chamber (22); and a hydraulic/pneumatic actuating device (13) for moving the piston (12) back and forth with respect to the cylinder (11) to cyclically vary the volume of the pump chamber (22); the hydraulic/pneumatic actuating device has a first actuating chamber (34) located beneath the pump chamber (22), a second actuating chamber (37) located above the first actuating chamber (34), and a control member (47) for cyclically filling the first actuating chamber (34) with pressurized oil.</p> |
