| 摘要 |
PURPOSE:To prevent any reflux starting from a working chamber into a suction passage by ejecting a high speed stream during an interval from proximity of a time at which capacity of the working chamber in a suction stroke is maximum, to proximity of a time at which communication between the working chamber and the suction passage is shut off. CONSTITUTION:In a high load range, a pump throttle valve 12 and closing valve 16 are fully opened, while a pump passage 11 is opened by a suction cut-off valve 13 for a certain duration within an interval from proximity of the time when the capacity of a working chamber 3 in a suction stroke is maximum, namely, when a piston reaches a bottom dead center, to proximity of the time when communication between the working chamber 3 and the suction passage 6 is shut off, namely, when a suction valve 4 is closed. The suction air fed under pressure from a pump 10 is thus ejected at a high velocity from a nozzle 15. |
