| 摘要 |
PROBLEM TO BE SOLVED: To preferably reduce an operating noise related to closing of a spill valve even when an internal combustion engine is in the low load operation state such as idling operation state. SOLUTION: The cam profile of a cam 25 for driving a high pressure fuel pump is asymmetric between an intake stroke and an injection stroke. To be concrete, the cam angleθ1 in the injection stroke is made larger than the cam angleθ2, so that even if the driving shaft is rotated at a constant speed, the time required for the injection stroke becomes longer, so the volume change speed of the pressure chamber in the injection stroke is lessened.
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