| 摘要 |
PROBLEM TO BE SOLVED: To suitably reduce pressure pulsation corresponding to an action of an engine-driven type high-pressure pump. ! SOLUTION: A pulsation reduction device 70 includes a passage sectioning part 72 which sections a flowing route for fuel between a branch passage 39 connected to a high-pressure pump and a branch passage 38 connected to a low-pressure pump. A valve element 74 is arranged in the flowing route sectioned by the passage sectioning part 72, a coil spring 76 is arranged downstream from the valve element 74 and a coil spring 78 is arranged upstream from the valve element 74. When a resonance phenomenon occurs during suction of fuel by the high-pressure pump, suction pressure of the fuel increases and the valve element 74 comes into contact with a seat part 80 positioned on the downstream side, so that pressure variation is reduced. Further, when a resonance phenomenon occurs during return of fuel from the high-pressure pump to the low-pressure pump, discharge pressure of the fuel in |
